Do not process commands coming from ourselves (help text)

Quite a few changes involved. Mostly variable renames and a few changes to `await`s.

Not ready yet because bot cannot login due to some arcane error of `expected value at line 1 column 1`.

Co-authored-by: projectmoon <projectmoon@noreply.git.agnos.is>
Reviewed-on: #98

.drone.yml

@@ -0,0 +1,27 @@
+kind: pipeline
+name: build-and-test
+
+steps:
+- name: test
+  image: rust:1.80
+  commands:
+  - apt-get update
+  - apt-get install -y cmake
+  - rustup component add rustfmt
+  - cargo build --verbose --all
+  - cargo test --verbose --all
+
+- name: docker
+  image: plugins/docker
+  when:
+    ref:
+    - refs/tags/v*
+    - refs/heads/master
+  settings:
+    auto_tag: true
+    username:
+      from_secret: docker_username
+    password:
+      from_secret: docker_password
+    repo: ghcr.io/projectmoon/chronicle-dicebot
+    registry: ghcr.io

.env

@@ -0,0 +1,2 @@
+DATABASE_URL="sqlite://test-db/dicebot.sqlite"
+SQLX_OFFLINE="true"

.github/workflows/dicebot-ci.yml

@@ -26,43 +26,43 @@ jobs:
     - name: Run tests
       run: cargo test --verbose
 
-  # Push image to GitHub Packages.
+  # # Push image to GitHub Packages.
-  # See also https://docs.docker.com/docker-hub/builds/
+  # # See also https://docs.docker.com/docker-hub/builds/
-  push:
+  # push:
-    # Ensure test job passes before pushing image.
+  #   # Ensure test job passes before pushing image.
-    needs: build_and_test
+  #   needs: build_and_test
 
-    runs-on: ubuntu-latest
+  #   runs-on: ubuntu-latest
-    if: github.event_name == 'push'
+  #   if: github.event_name == 'push'
 
-    steps:
+  #   steps:
-      - uses: actions/checkout@v2
+  #     - uses: actions/checkout@v2
 
-      - name: Build image
+  #     - name: Build image
-        run: docker build . --file Dockerfile --tag $IMAGE_NAME
+  #       run: docker build . --file Dockerfile --tag $IMAGE_NAME
 
-      - name: Log into GitHub Container Registry
+  #     - name: Log into GitHub Container Registry
-      # TODO: Create a PAT with `read:packages` and `write:packages` scopes and save it as an Actions secret `CR_PAT`
+  #     # TODO: Create a PAT with `read:packages` and `write:packages` scopes and save it as an Actions secret `CR_PAT`
-        run: echo "${{ secrets.CR_PAT }}" | docker login https://ghcr.io -u ${{ github.actor }} --password-stdin
+  #       run: echo "${{ secrets.CR_PAT }}" | docker login https://ghcr.io -u ${{ github.actor }} --password-stdin
 
-      - name: Push image to GitHub Container Registry
+  #     - name: Push image to GitHub Container Registry
-        run: |
+  #       run: |
-          IMAGE_ID=ghcr.io/${{ github.repository_owner }}/$IMAGE_NAME
+  #         IMAGE_ID=ghcr.io/${{ github.repository_owner }}/$IMAGE_NAME
 
-          # Change all uppercase to lowercase
+  #         # Change all uppercase to lowercase
-          IMAGE_ID=$(echo $IMAGE_ID | tr '[A-Z]' '[a-z]')
+  #         IMAGE_ID=$(echo $IMAGE_ID | tr '[A-Z]' '[a-z]')
 
-          # Strip git ref prefix from version
+  #         # Strip git ref prefix from version
-          VERSION=$(echo "${{ github.ref }}" | sed -e 's,.*/\(.*\),\1,')
+  #         VERSION=$(echo "${{ github.ref }}" | sed -e 's,.*/\(.*\),\1,')
 
-          # Strip "v" prefix from tag name
+  #         # Strip "v" prefix from tag name
-          [[ "${{ github.ref }}" == "refs/tags/"* ]] && VERSION=$(echo $VERSION | sed -e 's/^v//')
+  #         [[ "${{ github.ref }}" == "refs/tags/"* ]] && VERSION=$(echo $VERSION | sed -e 's/^v//')
 
-          # Use Docker `latest` tag convention
+  #         # Use Docker `latest` tag convention
-          [ "$VERSION" == "master" ] && VERSION=latest
+  #         [ "$VERSION" == "master" ] && VERSION=latest
 
-          echo IMAGE_ID=$IMAGE_ID
+  #         echo IMAGE_ID=$IMAGE_ID
-          echo VERSION=$VERSION
+  #         echo VERSION=$VERSION
 
-          docker tag $IMAGE_NAME $IMAGE_ID:$VERSION
+  #         docker tag $IMAGE_NAME $IMAGE_ID:$VERSION
-          docker push $IMAGE_ID:$VERSION
+  #         docker push $IMAGE_ID:$VERSION

.gitignore

@@ -9,3 +9,6 @@ test-db/
 bot-db*
 # We store a disabled async test in this file
 bigboy
+.#*
+*.sqlite
+.tmp*

Cargo.toml

@@ -1,42 +1,6 @@
-[package]
+[workspace]
-name = "chronicle-dicebot"
-version = "0.7.0"
-authors = ["Taylor C. Richberger <taywee@gmx.com>", "projectmoon <projectmoon@agnos.is>"]
-edition = "2018"
-license = 'MIT'
-description = 'A simple async Matrix dicebot'
-readme = 'README.md'
-repository = 'https://github.com/ProjectMoon/matrix-dicebot'
-keywords = ["games", "dice", "matrix", "bot"]
-categories = ["games"]
 
-[dependencies]
+members = [
-log = "0.4"
+    "dicebot",
-env_logger = "0.7"
+    "rpc"
-toml = "0.5"
+]
-nom = "5"
-rand = "0.7"
-thiserror = "1.0"
-itertools = "0.9"
-async-trait = "0.1"
-url = "2.1"
-dirs = "3.0"
-indoc = "1.0"
-combine = "4.3"
-sled = "0.34"
-zerocopy = "0.3"
-byteorder = "1.3"
-futures = "0.3"
-memmem = "0.1"
-bincode = "1.3"
-phf = { version = "0.7", features = ["macros"] }
-olm-sys = "1.0"
-matrix-sdk = { git = "https://github.com/matrix-org/matrix-rust-sdk", rev = "master" }
-
-[dependencies.serde]
-version = "1"
-features = ['derive']
-
-[dependencies.tokio]
-version = "0.2"
-features = [ "full" ]

Dockerfile

@@ -1,25 +1,28 @@
 # Builder image with development dependencies.
-FROM bougyman/voidlinux:glibc as builder
+FROM ghcr.io/void-linux/void-linux:latest-mini-x86_64 as builder
+RUN xbps-install -S
+RUN xbps-install -yu xbps
 RUN xbps-install -Syu
-RUN xbps-install -Sy base-devel rust cargo cmake wget gnupg
+RUN xbps-install -Sy base-devel rustup cmake wget gnupg
-RUN xbps-install -Sy libressl-devel libstdc++-devel
+RUN xbps-install -Sy openssl-devel libstdc++-devel
+RUN rustup-init -qy
 
 # Install tini for signal processing and zombie killing
 ENV TINI_VERSION v0.19.0
 ADD https://github.com/krallin/tini/releases/download/${TINI_VERSION}/tini /usr/local/bin/tini
-ADD https://github.com/krallin/tini/releases/download/${TINI_VERSION}/tini.asc /tini.asc
-RUN gpg --batch --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys 595E85A6B1B4779EA4DAAEC70B588DFF0527A9B7 \
- && gpg --batch --verify /tini.asc /usr/local/bin/tini
 RUN chmod +x /usr/local/bin/tini
 
 # Build dicebot
 RUN mkdir -p /root/src
 WORKDIR /root/src
 ADD . ./
-RUN cargo build --release
+RUN . /root/.cargo/env && cargo build --release
 
 # Final image
-FROM bougyman/voidlinux:latest
+FROM ghcr.io/void-linux/void-linux:latest-mini-x86_64
+RUN xbps-install -S
+RUN xbps-install -yu xbps
+RUN xbps-install -Syu
 RUN xbps-install -Sy ca-certificates libstdc++
 COPY --from=builder \
     /root/src/target/release/dicebot \

LICENSE

@@ -1,7 +1,19 @@
+This software is governed by the terms of the Affero GNU General
+Public License. Portions of the code come from the original
+MIT-licensed project, and the terms of the MIT license also apply to
+those portions. In files that are partially or wholly subject to the
+MIT license in addition to the Affero GNU General Public License, this
+is noted with a header at the top of the file.
+
+Original upstream project: https://gitlab.com/Taywee/axfive-matrix-dicebot
+
+For code from the original project that is governed by the MIT license
+in addition to the Affero GNU General Public License, the following
+terms apply:
+
 MIT License
 
 Copyright (c) 2020 Taylor C. Richberger
-Modified work Copyright (c) 2020 projectmoon
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
@@ -20,3 +32,668 @@ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
+
+The project as a whole is governed by the terms of the Affero GNU
+General Public License:
+
+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
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+<https://www.gnu.org/licenses/>.

README.md

@@ -1,28 +1,54 @@
-# matrix-dicebot
+# Tenebrous Dicebot
 
-This is a fork of the
+[![Build Status](https://drone.agnos.is/api/badges/projectmoon/tenebrous-dicebot/status.svg)](https://drone.agnos.is/projectmoon/tenebrous-dicebot)
-[axfive-matrix-dicebot](https://gitlab.com/Taywee/axfive-matrix-dicebot)
+[![Matrix Chat](https://img.shields.io/matrix/tenebrous:agnos.is?label=matrix&server_fqdn=matrix.org)][matrix-room]
-with basic support for the Chronicles of Darkness 2E Storytelling
+
-System, with future plans to extend the codebase further to support
+_This repository is hosted on [Agnos.is Git][main-repo] and mirrored
-variables and perhaps character sheet management.
+to [GitHub][github-repo]._
+
+This is a dice rolling bot for facilitating roleplaying games on the
+Matrix messaging platform. It currently has basic support for the
+Chronicles of Darkness 2E Storytelling System and Call of Cthulhu,
+with plans to extend the codebase further to support other systems and
+character sheet management.
 
 ## Features
 
-`matrix-dicebot` is a basic dice rolling bot. It currently has the
+`tenebrous-dicebot` is a dice rolling bot for facilitating
-following features:
+role-playing games over Matrix (and anything that Matrix can bridge
+to, like Discord). It currently has the following features:
 
 * Rolling arbitrary dice expressions (e.g. 1d4, 1d20+5, 1d8+1d6, etc).
 * Rolling dice pools for the Chronicles of Darkness 2E Storytelling
 System.
+* Rolling dice for the Call of Cthulhu system.
 * Works in encrypted or unencrypted Matrix rooms.
+* Storing variables created by the user.
+
+## Support and Community
+
+The project has a Matrix room at [#tenebrous:agnos.is][matrix-room].
+It is also possible to make a post in [GitHub
+Discussions][github-discussions].
+
+For reporting bugs, we prefer that you open an issue on
+[git.agnos.is][agnosis-git-issues]. However, you may also open an
+issue on [GitHub][github-issues].
+
+### Development and Contributions
+
+All development occurs on [git.agnos.is][main-repo]. If you wish to
+contribute, please open a pull request there. In some cases, pull
+requests from GitHub may be accepted. All contributions must be
+licensed under [AGPL 3.0 or later][agpl] to be accepted.
 
 ## Building and Installation
 
 ### Docker Image
 
-The easiest way to run the dice bot is to use the official Docker
+The easiest way to run the dice bot is to use the [official Docker
-image. It is distributed on GitHub Container Registry by a CI
+image][docker-image]. It is distributed on GitHub Container Registry
-pipeline.
+by a CI pipeline.
 
 The `latest` tag always points to the most recent successfully built
 master commit and is considered unstable, while individual tags are
@@ -38,10 +64,21 @@ root of the repository.
 After pulling or building the image, see [instructions on how to use
 the Docker image](#running-the-bot).
 
+### Install from crates.io
+
+The project can be from [crates.io][crates-io]. To install it, execute
+`cargo install tenebrous-dicebot`. This will make the following
+executables available on your system:
+
+* `dicebot`: Main dicebot executable.
+* `dicebot-cmd`: Run dicebot commands from the command line.
+* `dicebot_migrate`: Standalone database migrator (not required).
+* `tonic_client`: Test client for the gRPC connection (not required).
+
 ### Build from Source
 
 Precompiled executables are not yet available. Clone this repository
-and run `OLM_LINK_VARIANT=dylib cargo install`.
+and run `cargo install`.
 
 Building the project requires:
 
@@ -49,13 +86,9 @@ Building the project requires:
   on Void and Arch, etc).
 * Rust 1.45.0 or higher.
 * OpenSSL/LibreSSL development headers installed.
-* `olm-sys` crate dependencies: cmake, libstdc++, libolm and its
+* `olm-sys` crate dependencies: cmake, libstdc++.
-  development headers.
 * glibc.
 
-Note: The `olm-sys` crate must be built in dynamic linking mode until
-a [bug][gnome-bug] in its build process is fixed.
-
 #### Why doesn't it build on musl libc?
 
 As far as I can tell, the project doesn't build on musl libc. It
@@ -85,8 +118,16 @@ expressions.
 !r 3d12 - 5d2 + 3 - 7d3 + 20d20
 ```
 
-This system does not yet have the capability to handle things like D&D
+#### Keep/Drop Dice
-5e advantage or disadvantage.
+The bot supports either keeping the highest dice in a roll, or
+dropping the highest dice in a roll.  This allows the bot to handle 
+things like D&D 5e advantage or disadvantage.
+
+```
+!roll 2d20k1
+!r 2d20dh1 + 5
+!r 10d10k5 + 10d10dh5 - 2
+```
 
 ### Storytelling System
 
@@ -105,12 +146,29 @@ colon.
 Examples:
 
 ```
-!pool 8     //regular pool of 8 dice
+!pool 8      //regular pool of 8 dice
 !pool n:8    //roll 8 dice, 9-again
 !pool ns3:8  //roll 8 dice, 9-again with only 3 successes for exceptional
 !pool rs2:5  //5 dice, rote quality, 2 successes for exceptional
 ```
 
+### Call of Cthulhu System
+
+The commands `!cthRoll`, `!cthroll`, `!cthARoll` and `!cthadv` are for
+the Call of Cthulhu system. `!cthRoll` and `!cthroll` are for rolling
+percentile dice against a target number. A `b:` or `bb:` can be
+prepended to get one or two bonus dice.
+
+`!cthARoll` and `!cthadv` are for skill advancement.
+
+Examples:
+
+```
+!cthRoll 50     //roll against a target of 50
+!cthRoll bb:60  //roll against a target of 60 with 2 bonus dice
+!cthARoll 30    //advancement roll against a target of 30
+```
+
 ### User Variables
 
 Users can store variables for use with the Storytelling dice pool
@@ -125,8 +183,11 @@ Examples:
 !get myvar //will print 5
 ```
 
-Variables can be referenced in dice pool rolling expressions, for
+Variables can be referenced in dice pool and Call of Cthulhu rolling
-example `!pool myvar` or `!pool myvar+3`.
+expressions, for example `!pool myvar` or `!pool myvar+3` or `!cthroll
+myvar`. The Call of Cthulhu advancement roll also accepts variables,
+and if a variable is used, and the roll is successful, it will update
+the variable with the new skill.
 
 ## Running the Bot
 
@@ -162,7 +223,7 @@ home_server = 'https://example.com'
 username = 'thisismyusername'
 password = 'thisismypassword'
 
-[datbase]
+[database]
 path = '/path/to/database/directory/'
 
 [bot]
@@ -212,14 +273,28 @@ commands locally.
 
 The most basic plans are:
 
-* To add support for simple per-user variable management, e.g. setting
+* Resource counting: creation of custom counters that can go up and
-  a name to a value (`gnosis = 3`) and then using those in dice rolls.
+  down.
-  This lays the foundation for character sheet integration.
 * Perhaps some sort of character sheet integration. But for that, we
   would need a sheet service.
 * Use environment variables instead of config file in Docker image.
+* Per-system game rules.
 
-[gnome-bug]: https://gitlab.gnome.org/BrainBlasted/olm-sys/-/issues/6
+## Credits
+
+This was orignally a fork of the [axfive-matrix-dicebot][axfive], with
+support added for Chronicles of Darkness and Call of Cthulhu.
+
+[axfive]: https://gitlab.com/Taywee/axfive-matrix-dicebot
 [config-file]: #Configuration-File
 [docker-image]: https://github.com/users/ProjectMoon/packages/container/package/chronicle-dicebot
 [dirs]: https://docs.rs/dirs/2.0.2/dirs/
+[main-repo]: https://git.agnos.is/projectmoon/tenebrous-dicebot
+[github-repo]: https://github.com/ProjectMoon/matrix-dicebot
+[roadmap]: https://git.agnos.is/projectmoon/tenebrous-dicebot/wiki/Roadmap
+[crates-io]: https://crates.io/crates/tenebrous-dicebot
+[matrix-room]: https://matrix.to/#/#tenebrous:agnos.is
+[agnosis-git-issues]: https://git.agnos.is/projectmoon/tenebrous-dicebot/issues
+[github-discussions]: https://github.com/ProjectMoon/matrix-dicebot/discussions
+[github-issues]: https://github.com/ProjectMoon/matrix-dicebot/issues
+[agpl]: https://www.gnu.org/licenses/agpl-3.0.en.html

dicebot/Cargo.toml

@@ -0,0 +1,57 @@
+[package]
+name = "tenebrous-dicebot"
+version = "0.13.2"
+rust-version = "1.68"
+authors = ["projectmoon <projectmoon@agnos.is>", "Taylor C. Richberger <taywee@gmx.com>"]
+edition = "2018"
+license = 'AGPL-3.0-or-later'
+description = 'An async Matrix dice bot for role-playing games'
+readme = '../README.md'
+repository = 'https://git.agnos.is/projectmoon/matrix-dicebot'
+keywords = ["games", "dice", "matrix", "bot"]
+categories = ["games"]
+
+[build-dependencies]
+tonic-build = "0.4"
+
+[dependencies]
+# indexmap version locked fixes a dependency cycle.
+# indexmap = "=1.6.2"
+log = "0.4"
+tracing-subscriber = "0.2"
+toml = "0.5"
+nom = "5"
+rand = "0.8"
+rust-argon2 = "0.8"
+thiserror = "1.0"
+itertools = "0.10"
+async-trait = "0.1"
+url = "2.1"
+dirs = "3.0"
+indoc = "1.0"
+combine = "4.5"
+futures = "0.3"
+html2text = "0.2"
+phf = { version = "0.8", features = ["macros"] }
+matrix-sdk = { version = "0.6" }
+refinery = { version = "0.8", features = ["rusqlite"]}
+barrel = { version = "0.7", features = ["sqlite3"] }
+strum = { version = "0.22", features = ["derive"] }
+tempfile = "3"
+substring = "1.4"
+fuse-rust = "0.2"
+tonic = "0.4"
+prost = "0.7"
+tenebrous-rpc = { path = "../rpc", version = "0.1.0" }
+
+[dependencies.sqlx]
+version = "0.6"
+features = [ "offline", "sqlite", "runtime-tokio-native-tls" ]
+
+[dependencies.serde]
+version = "1"
+features = ['derive']
+
+[dependencies.tokio]
+version = "1"
+features = [ "full" ]

dicebot/sqlx-data.json

@@ -0,0 +1,139 @@
+{
+  "db": "SQLite",
+  "19d89370cac05c1bc4de0eb3508712da9ca133b1cf9445b5407d238f89c3ab0c": {
+    "query": "SELECT device_id FROM bot_state limit 1",
+    "describe": {
+      "columns": [
+        {
+          "name": "device_id",
+          "ordinal": 0,
+          "type_info": "Text"
+        }
+      ],
+      "parameters": {
+        "Right": 0
+      },
+      "nullable": [
+        false
+      ]
+    }
+  },
+  "26903a92a7de34df3e227fe599e41ae1bb61612eb80befad398383af36df0ce4": {
+    "query": "DELETE FROM accounts WHERE user_id = ?",
+    "describe": {
+      "columns": [],
+      "parameters": {
+        "Right": 1
+      },
+      "nullable": []
+    }
+  },
+  "2d4a32735da04509c2e3c4f99bef79ef699964f58ae332b0611f3de088596e1e": {
+    "query": "INSERT INTO accounts (user_id, password, account_status)\n               VALUES (?, ?, ?)\n               ON CONFLICT(user_id) DO\n               UPDATE SET password = ?, account_status = ?",
+    "describe": {
+      "columns": [],
+      "parameters": {
+        "Right": 5
+      },
+      "nullable": []
+    }
+  },
+  "59313c67900a1a9399389720b522e572f181ae503559cd2b49d6305acb9e2207": {
+    "query": "SELECT key, value as \"value: i32\" FROM user_variables\n               WHERE room_id = ? AND user_id = ?",
+    "describe": {
+      "columns": [
+        {
+          "name": "key",
+          "ordinal": 0,
+          "type_info": "Text"
+        },
+        {
+          "name": "value: i32",
+          "ordinal": 1,
+          "type_info": "Int64"
+        }
+      ],
+      "parameters": {
+        "Right": 2
+      },
+      "nullable": [
+        false,
+        false
+      ]
+    }
+  },
+  "636b1b868eaf04cd234fbf17747d94a66e81f7bc1b060ba14151dbfaf40eeefc": {
+    "query": "SELECT value as \"value: i32\" FROM user_variables\n               WHERE user_id = ? AND room_id = ? AND key = ?",
+    "describe": {
+      "columns": [
+        {
+          "name": "value: i32",
+          "ordinal": 0,
+          "type_info": "Int64"
+        }
+      ],
+      "parameters": {
+        "Right": 3
+      },
+      "nullable": [
+        false
+      ]
+    }
+  },
+  "667b26343ce44e1c48ac689ce887ef6a0558a2ce199f7372a5dce58672499c5a": {
+    "query": "INSERT INTO user_state (user_id, active_room)\n               VALUES (?, ?)\n               ON CONFLICT(user_id) DO\n               UPDATE SET active_room = ?",
+    "describe": {
+      "columns": [],
+      "parameters": {
+        "Right": 3
+      },
+      "nullable": []
+    }
+  },
+  "711d222911c1258365a6a0de1fe00eeec4686fd3589e976e225ad599e7cfc75d": {
+    "query": "SELECT count(*) as \"count: i32\" FROM user_variables\n               WHERE room_id = ? and user_id = ?",
+    "describe": {
+      "columns": [
+        {
+          "name": "count: i32",
+          "ordinal": 0,
+          "type_info": "Int"
+        }
+      ],
+      "parameters": {
+        "Right": 2
+      },
+      "nullable": [
+        false
+      ]
+    }
+  },
+  "bba0fc255e7c30d1d2d9468c68ba38db6e8a13be035aa1152933ba9247b14f8c": {
+    "query": "SELECT event_id FROM room_events\n               WHERE room_id = ? AND event_id = ?",
+    "describe": {
+      "columns": [
+        {
+          "name": "event_id",
+          "ordinal": 0,
+          "type_info": "Text"
+        }
+      ],
+      "parameters": {
+        "Right": 2
+      },
+      "nullable": [
+        false
+      ]
+    }
+  },
+  "dce9bb45cf954054a920ee8b53852c6d562e3588d76bbfaa1433d8309d4e4921": {
+    "query": "DELETE FROM user_state WHERE user_id = ?",
+    "describe": {
+      "columns": [],
+      "parameters": {
+        "Right": 1
+      },
+      "nullable": []
+    }
+  }
+}

dicebot/src/basic/dice.rs

@@ -1,23 +1,57 @@
-pub mod parser;
+/**
-
+ * In addition to the terms of the AGPL, this file is governed by the
+ * terms of the MIT license, from the original axfive-matrix-dicebot
+ * project.
+ */
 use std::fmt;
 use std::ops::{Deref, DerefMut};
 
+/// A basic dice roll, in XdY notation, like "1d4" or "3d6".
+/// Optionally supports D&D advantage/disadvantge keep-or-drop
+/// functionality.
 #[derive(Debug, PartialEq, Eq, Clone, Copy)]
 pub struct Dice {
     pub(crate) count: u32,
     pub(crate) sides: u32,
+    pub(crate) keep_drop: KeepOrDrop,
+}
+
+/// Enum indicating how to handle bonuses or penalties using extra
+/// dice. If set to Keep, the roll will keep the highest X number of
+/// dice in the roll, and add those together. If set to Drop, the
+/// opposite is performed, and the lowest X number of dice are added
+/// instead. If set to None, then all dice in the roll are added up as
+/// normal.
+#[derive(Debug, PartialEq, Eq, Clone, Copy)]
+pub enum KeepOrDrop {
+    /// Keep only the X highest dice for adding up to the total.
+    Keep(u32),
+
+    /// Keep only the X lowest dice (i.e. drop the highest) for adding
+    /// up to the total.
+    Drop(u32),
+
+    /// Add up all dice in the roll for the total.
+    None,
 }
 
 impl fmt::Display for Dice {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(f, "{}d{}", self.count, self.sides)
+        match self.keep_drop {
+            KeepOrDrop::Keep(keep) => write!(f, "{}d{}k{}", self.count, self.sides, keep),
+            KeepOrDrop::Drop(drop) => write!(f, "{}d{}dh{}", self.count, self.sides, drop),
+            KeepOrDrop::None => write!(f, "{}d{}", self.count, self.sides),
+        }
     }
 }
 
 impl Dice {
-    fn new(count: u32, sides: u32) -> Dice {
+    pub fn new(count: u32, sides: u32, keep_drop: KeepOrDrop) -> Dice {
-        Dice { count, sides }
+        Dice {
+            count,
+            sides,
+            keep_drop,
+        }
     }
 }
 
@@ -52,7 +86,7 @@ impl fmt::Display for SignedElement {
 }
 
 #[derive(Debug, PartialEq, Eq, Clone)]
-pub struct ElementExpression(Vec<SignedElement>);
+pub struct ElementExpression(pub Vec<SignedElement>);
 
 impl Deref for ElementExpression {
     type Target = Vec<SignedElement>;

dicebot/src/basic/mod.rs

@@ -0,0 +1,3 @@
+pub mod dice;
+pub mod parser;
+pub mod roll;

dicebot/src/basic/parser.rs

@@ -0,0 +1,360 @@
+/**
+ * In addition to the terms of the AGPL, this file is governed by the
+ * terms of the MIT license, from the original axfive-matrix-dicebot
+ * project.
+ */
+use nom::bytes::complete::take_while;
+use nom::error::ErrorKind as NomErrorKind;
+use nom::Err as NomErr;
+use nom::{
+    alt, bytes::complete::tag, character::complete::digit1, complete, many0, named,
+    sequence::tuple, tag, IResult,
+};
+
+use super::dice::*;
+
+//******************************
+//Legacy Code
+//******************************
+
+fn is_whitespace(input: char) -> bool {
+    input == ' ' || input == '\n' || input == '\t' || input == '\r'
+}
+
+/// Eat whitespace, returning it
+pub fn eat_whitespace(input: &str) -> IResult<&str, &str> {
+    let (input, whitespace) = take_while(is_whitespace)(input)?;
+    Ok((input, whitespace))
+}
+
+#[derive(Debug, PartialEq, Eq, Clone, Copy)]
+enum Sign {
+    Plus,
+    Minus,
+}
+
+/// Intermediate parsed value for a keep-drop expression to indicate
+/// which one it is.
+enum ParsedKeepOrDrop<'a> {
+    Keep(&'a str),
+    Drop(&'a str),
+    NotPresent,
+}
+
+macro_rules! too_big {
+    ($input: expr) => {
+        NomErr::Error(($input, NomErrorKind::TooLarge))
+    };
+}
+
+/// Parse a dice expression.  Does not eat whitespace
+fn parse_dice(input: &str) -> IResult<&str, Dice> {
+    let (input, (count, _, sides)) = tuple((digit1, tag("d"), digit1))(input)?;
+    let count: u32 = count.parse().map_err(|_| too_big!(count))?;
+    let sides = sides.parse().map_err(|_| too_big!(sides))?;
+    let (input, keep_drop) = parse_keep_or_drop(input, count)?;
+    Ok((input, Dice::new(count, sides, keep_drop)))
+}
+
+/// Extract keep/drop number as a string. Fails if the value is not a
+/// string.
+fn parse_keep_or_drop_text<'a>(
+    symbol: &'a str,
+    input: &'a str,
+) -> IResult<&'a str, ParsedKeepOrDrop<'a>> {
+    let (parsed_kd, input) = match tuple::<&str, _, (_, _), _>((tag(symbol), digit1))(input) {
+        // if ok, one of the expressions is present
+        Ok((rest, (_, kd_expr))) => match symbol {
+            "k" => (ParsedKeepOrDrop::Keep(kd_expr), rest),
+            "dh" => (ParsedKeepOrDrop::Drop(kd_expr), rest),
+            _ => panic!("Unrecogized keep-drop symbol: {}", symbol),
+        },
+        // otherwise absent (attempt to keep all dice)
+        Err(_) => (ParsedKeepOrDrop::NotPresent, input),
+    };
+
+    Ok((input, parsed_kd))
+}
+
+/// Parse keep/drop expression, which consits of "k" or "dh" following
+/// a dice expression. For example, "1d4h3" or "1d4dh2".
+fn parse_keep_or_drop<'a>(input: &'a str, count: u32) -> IResult<&'a str, KeepOrDrop> {
+    let (input, keep) = parse_keep_or_drop_text("k", input)?;
+    let (input, drop) = parse_keep_or_drop_text("dh", input)?;
+
+    use ParsedKeepOrDrop::*;
+    let keep_drop: KeepOrDrop = match (keep, drop) {
+        //Potential valid Keep expression.
+        (Keep(keep), NotPresent) => match keep.parse().map_err(|_| too_big!(input))? {
+            _i if _i > count || _i == 0 => Ok(KeepOrDrop::None),
+            i => Ok(KeepOrDrop::Keep(i)),
+        },
+        //Potential valid Drop expression.
+        (NotPresent, Drop(drop)) => match drop.parse().map_err(|_| too_big!(input))? {
+            _i if _i >= count => Ok(KeepOrDrop::None),
+            i => Ok(KeepOrDrop::Drop(i)),
+        },
+        //No Keep or Drop specified; regular behavior.
+        (NotPresent, NotPresent) => Ok(KeepOrDrop::None),
+        //Anything else is an error.
+        _ => Err(NomErr::Error((input, NomErrorKind::Many1))),
+    }?;
+
+    Ok((input, keep_drop))
+}
+
+// Parse a single digit expression.  Does not eat whitespace
+fn parse_bonus(input: &str) -> IResult<&str, u32> {
+    let (input, bonus) = digit1(input)?;
+    Ok((input, bonus.parse().unwrap()))
+}
+
+// Parse a sign expression.  Eats whitespace.
+fn parse_sign(input: &str) -> IResult<&str, Sign> {
+    let (input, _) = eat_whitespace(input)?;
+    named!(sign(&str) -> Sign, alt!(
+            complete!(tag!("+")) => { |_| Sign::Plus } |
+            complete!(tag!("-")) => { |_| Sign::Minus }
+    ));
+
+    let (input, sign) = sign(input)?;
+    Ok((input, sign))
+}
+
+// Parse an element expression.  Eats whitespace.
+fn parse_element(input: &str) -> IResult<&str, Element> {
+    let (input, _) = eat_whitespace(input)?;
+    named!(element(&str) -> Element, alt!(
+            parse_dice => { |d| Element::Dice(d) } |
+            parse_bonus => { |b| Element::Bonus(b) }
+    ));
+
+    let (input, element) = element(input)?;
+    Ok((input, element))
+}
+
+// Parse a signed element expression.  Eats whitespace.
+fn parse_signed_element(input: &str) -> IResult<&str, SignedElement> {
+    let (input, _) = eat_whitespace(input)?;
+    let (input, sign) = parse_sign(input)?;
+    let (input, _) = eat_whitespace(input)?;
+
+    let (input, element) = parse_element(input)?;
+    let element = match sign {
+        Sign::Plus => SignedElement::Positive(element),
+        Sign::Minus => SignedElement::Negative(element),
+    };
+    Ok((input, element))
+}
+
+// Parse a full element expression.  Eats whitespace.
+pub fn parse_element_expression(input: &str) -> IResult<&str, ElementExpression> {
+    named!(first_element(&str) -> SignedElement, alt!(
+            parse_signed_element => { |e| e } |
+            parse_element => { |e| SignedElement::Positive(e) }
+    ));
+    let (input, first) = first_element(input)?;
+    let (input, rest) = if input.trim().is_empty() {
+        (input, vec![first])
+    } else {
+        named!(rest_elements(&str) -> Vec<SignedElement>, many0!(parse_signed_element));
+        let (input, mut rest) = rest_elements(input)?;
+        rest.insert(0, first);
+        (input, rest)
+    };
+
+    Ok((input, ElementExpression(rest)))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    #[test]
+    fn dice_test() {
+        assert_eq!(
+            parse_dice("2d4"),
+            Ok(("", Dice::new(2, 4, KeepOrDrop::None)))
+        );
+        assert_eq!(
+            parse_dice("20d40"),
+            Ok(("", Dice::new(20, 40, KeepOrDrop::None)))
+        );
+        assert_eq!(
+            parse_dice("8d7"),
+            Ok(("", Dice::new(8, 7, KeepOrDrop::None)))
+        );
+        assert_eq!(
+            parse_dice("2d20k1"),
+            Ok(("", Dice::new(2, 20, KeepOrDrop::Keep(1))))
+        );
+        assert_eq!(
+            parse_dice("100d10k90"),
+            Ok(("", Dice::new(100, 10, KeepOrDrop::Keep(90))))
+        );
+        assert_eq!(
+            parse_dice("11d10k10"),
+            Ok(("", Dice::new(11, 10, KeepOrDrop::Keep(10))))
+        );
+        assert_eq!(
+            parse_dice("12d10k11"),
+            Ok(("", Dice::new(12, 10, KeepOrDrop::Keep(11))))
+        );
+        assert_eq!(
+            parse_dice("12d10k13"),
+            Ok(("", Dice::new(12, 10, KeepOrDrop::None)))
+        );
+        assert_eq!(
+            parse_dice("12d10k0"),
+            Ok(("", Dice::new(12, 10, KeepOrDrop::None)))
+        );
+        assert_eq!(
+            parse_dice("20d40dh5"),
+            Ok(("", Dice::new(20, 40, KeepOrDrop::Drop(5))))
+        );
+        assert_eq!(
+            parse_dice("8d7dh9"),
+            Ok(("", Dice::new(8, 7, KeepOrDrop::None)))
+        );
+        assert_eq!(
+            parse_dice("8d7dh8"),
+            Ok(("", Dice::new(8, 7, KeepOrDrop::None)))
+        );
+    }
+
+    #[test]
+    fn cant_have_both_keep_and_drop_test() {
+        let res = parse_dice("1d4k3dh2");
+        assert!(res.is_err());
+        match res {
+            Err(NomErr::Error((_, kind))) => {
+                assert_eq!(kind, NomErrorKind::Many1);
+            }
+            _ => panic!("Got success, expected error"),
+        }
+    }
+
+    #[test]
+    fn big_number_of_dice_doesnt_crash_test() {
+        let res = parse_dice("64378631476346123874527551481376547657868536d4");
+        assert!(res.is_err());
+        match res {
+            Err(NomErr::Error((input, kind))) => {
+                assert_eq!(kind, NomErrorKind::TooLarge);
+                assert_eq!(input, "64378631476346123874527551481376547657868536");
+            }
+            _ => panic!("Got success, expected error"),
+        }
+    }
+
+    #[test]
+    fn big_number_of_sides_doesnt_crash_test() {
+        let res = parse_dice("1d423562312587425472658956278456298376234876");
+        assert!(res.is_err());
+        match res {
+            Err(NomErr::Error((input, kind))) => {
+                assert_eq!(kind, NomErrorKind::TooLarge);
+                assert_eq!(input, "423562312587425472658956278456298376234876");
+            }
+            _ => panic!("Got success, expected error"),
+        }
+    }
+
+    #[test]
+    fn element_test() {
+        assert_eq!(
+            parse_element("  \t\n\r\n 8d7 \n"),
+            Ok((" \n", Element::Dice(Dice::new(8, 7, KeepOrDrop::None))))
+        );
+        assert_eq!(
+            parse_element("  \t\n\r\n 3d20k2 \n"),
+            Ok((" \n", Element::Dice(Dice::new(3, 20, KeepOrDrop::Keep(2)))))
+        );
+        assert_eq!(
+            parse_element("  \t\n\r\n 8 \n"),
+            Ok((" \n", Element::Bonus(8)))
+        );
+    }
+
+    #[test]
+    fn signed_element_test() {
+        assert_eq!(
+            parse_signed_element("+ 7"),
+            Ok(("", SignedElement::Positive(Element::Bonus(7))))
+        );
+        assert_eq!(
+            parse_signed_element("  \t\n\r\n- 8 \n"),
+            Ok((" \n", SignedElement::Negative(Element::Bonus(8))))
+        );
+        assert_eq!(
+            parse_signed_element("  \t\n\r\n- 8d4 \n"),
+            Ok((
+                " \n",
+                SignedElement::Negative(Element::Dice(Dice::new(8, 4, KeepOrDrop::None)))
+            ))
+        );
+        assert_eq!(
+            parse_signed_element("  \t\n\r\n- 8d4k4 \n"),
+            Ok((
+                " \n",
+                SignedElement::Negative(Element::Dice(Dice::new(8, 4, KeepOrDrop::Keep(4))))
+            ))
+        );
+        assert_eq!(
+            parse_signed_element("  \t\n\r\n+ 8d4 \n"),
+            Ok((
+                " \n",
+                SignedElement::Positive(Element::Dice(Dice::new(8, 4, KeepOrDrop::None)))
+            ))
+        );
+    }
+
+    #[test]
+    fn element_expression_test() {
+        assert_eq!(
+            parse_element_expression("8d4"),
+            Ok((
+                "",
+                ElementExpression(vec![SignedElement::Positive(Element::Dice(Dice::new(
+                    8,
+                    4,
+                    KeepOrDrop::None
+                )))])
+            ))
+        );
+        assert_eq!(
+            parse_element_expression("\t2d20k1 + 5"),
+            Ok((
+                "",
+                ElementExpression(vec![
+                    SignedElement::Positive(Element::Dice(Dice::new(2, 20, KeepOrDrop::Keep(1)))),
+                    SignedElement::Positive(Element::Bonus(5)),
+                ])
+            ))
+        );
+        assert_eq!(
+            parse_element_expression(" -  8d4 \n "),
+            Ok((
+                " \n ",
+                ElementExpression(vec![SignedElement::Negative(Element::Dice(Dice::new(
+                    8,
+                    4,
+                    KeepOrDrop::None
+                )))])
+            ))
+        );
+        assert_eq!(
+            parse_element_expression("\t3d4k2 + 7 - 5 - 6d12dh3 + 1d1 + 53 1d5 "),
+            Ok((
+                " 1d5 ",
+                ElementExpression(vec![
+                    SignedElement::Positive(Element::Dice(Dice::new(3, 4, KeepOrDrop::Keep(2)))),
+                    SignedElement::Positive(Element::Bonus(7)),
+                    SignedElement::Negative(Element::Bonus(5)),
+                    SignedElement::Negative(Element::Dice(Dice::new(6, 12, KeepOrDrop::Drop(3)))),
+                    SignedElement::Positive(Element::Dice(Dice::new(1, 1, KeepOrDrop::None))),
+                    SignedElement::Positive(Element::Bonus(53)),
+                ])
+            ))
+        );
+    }
+}

dicebot/src/basic/roll.rs

@@ -1,4 +1,10 @@
-use crate::dice;
+/**
+ * In addition to the terms of the AGPL, this file is governed by the
+ * terms of the MIT license, from the original axfive-matrix-dicebot
+ * project.
+ */
+use crate::basic::dice;
+use crate::basic::dice::KeepOrDrop;
 use rand::prelude::*;
 use std::fmt;
 use std::ops::{Deref, DerefMut};
@@ -14,15 +20,27 @@ pub trait Rolled {
 }
 
 #[derive(Debug, PartialEq, Eq, Clone)]
-pub struct DiceRoll(pub Vec<u32>);
+/// array of rolls in order, how many dice to keep, and how many to drop
+///   keep indicates how many of the highest dice to keep
+///   drop indicates how many of the highest dice to drop
+pub struct DiceRoll (pub Vec<u32>, usize, usize);
 
 impl DiceRoll {
     pub fn rolls(&self) -> &[u32] {
         &self.0
     }
 
+    pub fn keep(&self) -> usize {
+        self.1
+    }
+
+    pub fn drop(&self) -> usize {
+        self.2
+    }
+
+    // only count kept dice in total
     pub fn total(&self) -> u32 {
-        self.0.iter().sum()
+        self.0[self.2..self.1].iter().sum()
     }
 }
 
@@ -36,11 +54,21 @@ impl fmt::Display for DiceRoll {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         write!(f, "{}", self.rolled_value())?;
         let rolls = self.rolls();
-        let mut iter = rolls.iter();
+        let keep  = self.keep();
+        let drop  = self.drop();
+        let mut iter = rolls.iter().enumerate();
         if let Some(first) = iter.next() {
-            write!(f, " ({}", first)?;
+            if drop != 0 {
+                write!(f, " ([{}]", first.1)?;
+            } else {
+                write!(f, " ({}", first.1)?;
+            }
             for roll in iter {
-                write!(f, " + {}", roll)?;
+                if roll.0 >= keep || roll.0 < drop {
+                    write!(f, " + [{}]", roll.1)?;
+                } else {
+                    write!(f, " + {}", roll.1)?;
+                }
             }
             write!(f, ")")?;
         }
@@ -53,11 +81,17 @@ impl Roll for dice::Dice {
 
     fn roll(&self) -> DiceRoll {
         let mut rng = rand::thread_rng();
-        let rolls: Vec<_> = (0..self.count)
+        let mut rolls: Vec<_> = (0..self.count)
-            .map(|_| rng.gen_range(1, self.sides + 1))
+            .map(|_| rng.gen_range(1..=self.sides))
             .collect();
+        // sort rolls in descending order
+        rolls.sort_by(|a, b| b.cmp(a));
 
-        DiceRoll(rolls)
+        match self.keep_drop {
+            KeepOrDrop::Keep(k)  => DiceRoll(rolls,k as usize, 0),
+            KeepOrDrop::Drop(dh) => DiceRoll(rolls,self.count as usize, dh as usize),
+            KeepOrDrop::None     => DiceRoll(rolls,self.count as usize, 0),
+        }
     }
 }
 
@@ -193,18 +227,26 @@ mod tests {
     use super::*;
     #[test]
     fn dice_roll_display_test() {
-        assert_eq!(DiceRoll(vec![1, 3, 4]).to_string(), "8 (1 + 3 + 4)");
+        assert_eq!(DiceRoll(vec![1, 3, 4], 3, 0).to_string(), "8 (1 + 3 + 4)");
-        assert_eq!(DiceRoll(vec![]).to_string(), "0");
+        assert_eq!(DiceRoll(vec![], 0, 0).to_string(), "0");
         assert_eq!(
-            DiceRoll(vec![4, 7, 2, 10]).to_string(),
+            DiceRoll(vec![4, 7, 2, 10], 4, 0).to_string(),
             "23 (4 + 7 + 2 + 10)"
         );
+        assert_eq!(
+            DiceRoll(vec![20, 13, 11, 10], 3, 0).to_string(),
+            "44 (20 + 13 + 11 + [10])"
+        );
+        assert_eq!(
+            DiceRoll(vec![20, 13, 11, 10], 4, 1).to_string(),
+            "34 ([20] + 13 + 11 + 10)"
+        );
     }
 
     #[test]
     fn element_roll_display_test() {
         assert_eq!(
-            ElementRoll::Dice(DiceRoll(vec![1, 3, 4])).to_string(),
+            ElementRoll::Dice(DiceRoll(vec![1, 3, 4], 3, 0)).to_string(),
             "8 (1 + 3 + 4)"
         );
         assert_eq!(ElementRoll::Bonus(7).to_string(), "7");
@@ -213,11 +255,11 @@ mod tests {
     #[test]
     fn signed_element_roll_display_test() {
         assert_eq!(
-            SignedElementRoll::Positive(ElementRoll::Dice(DiceRoll(vec![1, 3, 4]))).to_string(),
+            SignedElementRoll::Positive(ElementRoll::Dice(DiceRoll(vec![1, 3, 4], 3, 0))).to_string(),
             "8 (1 + 3 + 4)"
         );
         assert_eq!(
-            SignedElementRoll::Negative(ElementRoll::Dice(DiceRoll(vec![1, 3, 4]))).to_string(),
+            SignedElementRoll::Negative(ElementRoll::Dice(DiceRoll(vec![1, 3, 4], 3, 0))).to_string(),
             "-8 (1 + 3 + 4)"
         );
         assert_eq!(
@@ -234,14 +276,14 @@ mod tests {
     fn element_expression_roll_display_test() {
         assert_eq!(
             ElementExpressionRoll(vec![SignedElementRoll::Positive(ElementRoll::Dice(
-                DiceRoll(vec![1, 3, 4])
+                DiceRoll(vec![1, 3, 4], 3, 0)
             )),])
             .to_string(),
             "8 (1 + 3 + 4)"
         );
         assert_eq!(
             ElementExpressionRoll(vec![SignedElementRoll::Negative(ElementRoll::Dice(
-                DiceRoll(vec![1, 3, 4])
+                DiceRoll(vec![1, 3, 4], 3, 0)
             )),])
             .to_string(),
             "-8 (1 + 3 + 4)"
@@ -258,8 +300,8 @@ mod tests {
         );
         assert_eq!(
             ElementExpressionRoll(vec![
-                SignedElementRoll::Positive(ElementRoll::Dice(DiceRoll(vec![1, 3, 4]))),
+                SignedElementRoll::Positive(ElementRoll::Dice(DiceRoll(vec![1, 3, 4], 3, 0))),
-                SignedElementRoll::Negative(ElementRoll::Dice(DiceRoll(vec![1, 2]))),
+                SignedElementRoll::Negative(ElementRoll::Dice(DiceRoll(vec![1, 2], 2, 0))),
                 SignedElementRoll::Positive(ElementRoll::Bonus(4)),
                 SignedElementRoll::Negative(ElementRoll::Bonus(7)),
             ])
@@ -268,13 +310,33 @@ mod tests {
         );
         assert_eq!(
             ElementExpressionRoll(vec![
-                SignedElementRoll::Negative(ElementRoll::Dice(DiceRoll(vec![1, 3, 4]))),
+                SignedElementRoll::Negative(ElementRoll::Dice(DiceRoll(vec![1, 3, 4], 3, 0))),
-                SignedElementRoll::Positive(ElementRoll::Dice(DiceRoll(vec![1, 2]))),
+                SignedElementRoll::Positive(ElementRoll::Dice(DiceRoll(vec![1, 2], 2, 0))),
                 SignedElementRoll::Negative(ElementRoll::Bonus(4)),
                 SignedElementRoll::Positive(ElementRoll::Bonus(7)),
             ])
             .to_string(),
             "-2 (-8 (1 + 3 + 4) + 3 (1 + 2) - 4 + 7)"
         );
+        assert_eq!(
+            ElementExpressionRoll(vec![
+                SignedElementRoll::Negative(ElementRoll::Dice(DiceRoll(vec![4, 3, 1], 3, 0))),
+                SignedElementRoll::Positive(ElementRoll::Dice(DiceRoll(vec![12, 2], 1, 0))),
+                SignedElementRoll::Negative(ElementRoll::Bonus(4)),
+                SignedElementRoll::Positive(ElementRoll::Bonus(7)),
+            ])
+            .to_string(),
+            "7 (-8 (4 + 3 + 1) + 12 (12 + [2]) - 4 + 7)"
+        );
+        assert_eq!(
+            ElementExpressionRoll(vec![
+                SignedElementRoll::Negative(ElementRoll::Dice(DiceRoll(vec![4, 3, 1], 3, 1))),
+                SignedElementRoll::Positive(ElementRoll::Dice(DiceRoll(vec![12, 2], 2, 0))),
+                SignedElementRoll::Negative(ElementRoll::Bonus(4)),
+                SignedElementRoll::Positive(ElementRoll::Bonus(7)),
+            ])
+            .to_string(),
+            "13 (-4 ([4] + 3 + 1) + 14 (12 + 2) - 4 + 7)"
+        );
     }
 }

dicebot/src/bin/dicebot-cmd.rs

@@ -0,0 +1,51 @@
+use matrix_sdk::ruma::room_id;
+use matrix_sdk::Client;
+use tenebrous_dicebot::commands;
+use tenebrous_dicebot::commands::ResponseExtractor;
+use tenebrous_dicebot::context::{Context, RoomContext};
+use tenebrous_dicebot::db::sqlite::Database;
+use tenebrous_dicebot::error::BotError;
+use tenebrous_dicebot::models::Account;
+use url::Url;
+
+#[tokio::main]
+async fn main() -> Result<(), BotError> {
+    let input = std::env::args().skip(1).collect::<Vec<String>>().join(" ");
+    let command = match commands::parser::parse_command(&input) {
+        Ok(command) => command,
+        Err(e) => return Err(e),
+    };
+
+    let homeserver = Url::parse("http://example.com")?;
+    let db_path = tempfile::NamedTempFile::new_in(".").unwrap();
+    let db = Database::new(
+        db_path
+            .path()
+            .to_str()
+            .expect("Could not get path to temporary db"),
+    )
+    .await?;
+
+    let context = Context {
+        db,
+        account: Account::default(),
+        matrix_client: Client::new(homeserver).await.expect("Could not create matrix client"),
+        origin_room: RoomContext {
+            id: &room_id!("!fakeroomid:example.com"),
+            display_name: "fake room".to_owned(),
+            secure: false,
+        },
+        active_room: RoomContext {
+            id: &room_id!("!fakeroomid:example.com"),
+            display_name: "fake room".to_owned(),
+            secure: false,
+        },
+        username: "@localuser:example.com",
+        message_body: &input,
+    };
+
+    let message = command.execute(&context).await.message_html("fakeuser");
+    let message = html2text::from_read(message.as_bytes(), 80);
+    println!("{}", message.trim());
+    Ok(())
+}

dicebot/src/bin/dicebot.rs

@@ -0,0 +1,73 @@
+//Needed for nested Result handling from tokio. Probably can go away after 1.47.0.
+#![type_length_limit = "7605144"]
+use futures::try_join;
+use log::error;
+use matrix_sdk::Client;
+use std::env;
+use std::sync::{Arc, RwLock};
+use tenebrous_dicebot::bot::DiceBot;
+use tenebrous_dicebot::config::*;
+use tenebrous_dicebot::db::sqlite::Database;
+use tenebrous_dicebot::error::BotError;
+use tenebrous_dicebot::rpc;
+use tenebrous_dicebot::state::DiceBotState;
+use tracing_subscriber::filter::EnvFilter;
+
+/// Attempt to create config object and ddatabase connection pool from
+/// the given config path. An error is returned if config creation or
+/// database pool creation fails for some reason.
+async fn init(config_path: &str) -> Result<(Arc<Config>, Database, Client), BotError> {
+    let cfg = read_config(config_path)?;
+    let cfg = Arc::new(cfg);
+    let sqlite_path = format!("{}/dicebot.sqlite", cfg.database_path());
+    let db = Database::new(&sqlite_path).await?;
+    let client = tenebrous_dicebot::matrix::create_client(&cfg).await?;
+    Ok((cfg, db, client))
+}
+
+#[tokio::main]
+async fn main() -> Result<(), BotError> {
+    let filter = if env::var("RUST_LOG").is_ok() {
+        EnvFilter::from_default_env()
+    } else {
+        EnvFilter::new("tonic=info,tenebrous_dicebot=info,dicebot=info,refinery=info")
+    };
+
+    tracing_subscriber::fmt().with_env_filter(filter).init();
+
+    match run().await {
+        Ok(_) => (),
+        Err(e) => error!("Error: {}", e),
+    }
+
+    Ok(())
+}
+
+async fn run() -> Result<(), BotError> {
+    let config_path = std::env::args()
+        .skip(1)
+        .next()
+        .expect("Need a config as an argument");
+
+    let (cfg, db, client) = init(&config_path).await?;
+    let grpc = rpc::serve_grpc(&cfg, &db, &client);
+    let bot = run_bot(&cfg, &db, &client);
+
+    match try_join!(bot, grpc) {
+        Ok(_) => (),
+        Err(e) => error!("Error: {:?}", e),
+    };
+
+    Ok(())
+}
+
+async fn run_bot(cfg: &Arc<Config>, db: &Database, client: &Client) -> Result<(), BotError> {
+    let state = Arc::new(RwLock::new(DiceBotState::new(&cfg)));
+
+    match DiceBot::new(cfg, &state, db, client) {
+        Ok(bot) => bot.run().await?,
+        Err(e) => println!("Error connecting: {:?}", e),
+    };
+
+    Ok(())
+}

dicebot/src/bin/dicebot_migrate.rs

@@ -0,0 +1,16 @@
+use std::env;
+use tenebrous_dicebot::db::sqlite::migrator;
+
+#[tokio::main]
+async fn main() -> Result<(), migrator::MigrationError> {
+    let args: Vec<String> = env::args().collect();
+    let db_path: &str = match &args[..] {
+        [_, path] => path.as_ref(),
+        [_, _, ..] => panic!("Expected exactly 0 or 1 argument"),
+        _ => "dicebot.sqlite",
+    };
+
+    println!("Using database: {}", db_path);
+
+    migrator::migrate(db_path).await
+}

dicebot/src/bin/tonic_client.rs

@@ -0,0 +1,33 @@
+use tenebrous_rpc::protos::dicebot::UserIdRequest;
+use tenebrous_rpc::protos::dicebot::{dicebot_client::DicebotClient};
+use tonic::{metadata::MetadataValue, transport::Channel, Request};
+
+async fn create_client(
+    shared_secret: &str,
+) -> Result<DicebotClient<Channel>, Box<dyn std::error::Error>> {
+    let channel = Channel::from_static("http://0.0.0.0:9090")
+        .connect()
+        .await?;
+
+    let bearer = MetadataValue::from_str(&format!("Bearer {}", shared_secret))?;
+
+    let client = DicebotClient::with_interceptor(channel, move |mut req: Request<()>| {
+        req.metadata_mut().insert("authorization", bearer.clone());
+        Ok(req)
+    });
+
+    Ok(client)
+}
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let mut client = create_client("example-key").await?;
+
+    let request = tonic::Request::new(UserIdRequest {
+        user_id: "@projectmoon:agnos.is".into(),
+    });
+
+    let response = client.rooms_for_user(request).await?.into_inner();
+    println!("Rooms: {:?}", response.rooms);
+    Ok(())
+}

dicebot/src/bot/command_execution.rs

@@ -0,0 +1,173 @@
+use crate::context::{Context, RoomContext};
+use crate::db::sqlite::Database;
+use crate::error::BotError;
+use crate::logic;
+use crate::matrix;
+use crate::{
+    commands::{execute_command, ExecutionResult, ResponseExtractor},
+    models::Account,
+};
+use futures::stream::{self, StreamExt};
+use matrix_sdk::ruma::{OwnedEventId, RoomId};
+use matrix_sdk::{self, room::Joined, Client};
+use std::clone::Clone;
+use std::convert::TryFrom;
+
+/// Handle responding to a single command being executed. Wil print
+/// out the full result of that command.
+pub(super) async fn handle_single_result(
+    client: &Client,
+    cmd_result: &ExecutionResult,
+    respond_to: &str,
+    room: &Joined,
+    event_id: OwnedEventId,
+) {
+    let html = cmd_result.message_html(respond_to);
+    let plain = cmd_result.message_plain(respond_to);
+    matrix::send_message(client, room.room_id(), (&html, &plain), Some(event_id)).await;
+}
+
+/// Format failure messages nicely in either HTML or plain text. If
+/// plain is true, plain-text will be returned. Otherwise, formatted
+/// HTML.
+fn format_failures(
+    errors: &[(&str, &BotError)],
+    commands_executed: usize,
+    respond_to: &str,
+    plain: bool,
+) -> String {
+    let respond_to = match plain {
+        true => respond_to.to_owned(),
+        false => format!(
+            "<a href=\"https://matrix.to/#/{}\">{}</a>",
+            respond_to, respond_to
+        ),
+    };
+
+    let failures: Vec<String> = errors
+        .iter()
+        .map(|&(cmd, err)| format!("<strong>{}:</strong> {}", cmd, err))
+        .collect();
+
+    let message = format!(
+        "{}: Executed {} commands ({} failed)\n\nFailures:\n{}",
+        respond_to,
+        commands_executed,
+        errors.len(),
+        failures.join("\n")
+    )
+    .replace("\n", "<br/>");
+
+    match plain {
+        true => html2text::from_read(message.as_bytes(), message.len()),
+        false => message,
+    }
+}
+
+/// Handle responding to multiple commands being executed. Will print
+/// out how many commands succeeded and failed (if any failed).
+pub(super) async fn handle_multiple_results(
+    client: &Client,
+    results: &[(String, ExecutionResult)],
+    respond_to: &str,
+    room: &Joined,
+) {
+    let user_pill = format!(
+        "<a href=\"https://matrix.to/#/{}\">{}</a>",
+        respond_to, respond_to
+    );
+
+    let errors: Vec<(&str, &BotError)> = results
+        .into_iter()
+        .filter_map(|(cmd, result)| match result {
+            Err(e) => Some((cmd.as_ref(), e)),
+            _ => None,
+        })
+        .collect();
+
+    let (message, plain) = if errors.len() == 0 {
+        (
+            format!("{}: Executed {} commands", user_pill, results.len()),
+            format!("{}: Executed {} commands", respond_to, results.len()),
+        )
+    } else {
+        (
+            format_failures(&errors, results.len(), respond_to, false),
+            format_failures(&errors, results.len(), respond_to, true),
+        )
+    };
+
+    matrix::send_message(client, room.room_id(), (&message, &plain), None).await;
+}
+
+/// Map an account's active room value to an actual matrix room, if
+/// the account has an active room. This only retrieves the
+/// user-specified active room, and doesn't perform any further
+/// filtering.
+fn get_account_active_room(client: &Client, account: &Account) -> Result<Option<Joined>, BotError> {
+    let active_room = account
+        .registered_user()
+        .and_then(|u| u.active_room.as_deref())
+        .map(|room_id| <&RoomId>::try_from(room_id))
+        .transpose()?
+        .and_then(|active_room_id| client.get_joined_room(active_room_id));
+
+    Ok(active_room)
+}
+
+/// Execute a single command in the list of commands. Can fail if the
+/// Account value cannot be created/fetched from the database, or if
+/// room display names cannot be calculated. Otherwise, the success or
+/// error of command execution itself is returned.
+async fn execute_single_command(
+    command: &str,
+    db: &Database,
+    client: &Client,
+    origin_room: &Joined,
+    sender: &str,
+) -> ExecutionResult {
+    let origin_ctx = RoomContext::new(origin_room, sender).await?;
+    let account = logic::get_account(db, sender).await?;
+    let active_room = get_account_active_room(client, &account)?;
+
+    // Active room is used in secure command-issuing rooms. In
+    // "public" rooms, where other users are, treat origin as the
+    // active room.
+    let active_room = active_room
+        .as_ref()
+        .filter(|_| origin_ctx.secure)
+        .unwrap_or(origin_room);
+
+    let active_ctx = RoomContext::new(active_room, sender).await?;
+
+    let ctx = Context {
+        account,
+        db: db.clone(),
+        matrix_client: client.clone(),
+        origin_room: origin_ctx,
+        username: &sender,
+        active_room: active_ctx,
+        message_body: &command,
+    };
+
+    execute_command(&ctx).await
+}
+
+/// Attempt to execute all commands sent to the bot in a message. This
+/// asynchronously executes all commands given to it. A Vec of all
+/// commands and their execution results are returned.
+pub(super) async fn execute(
+    commands: Vec<&str>,
+    db: &Database,
+    client: &Client,
+    room: &Joined,
+    sender: &str,
+) -> Vec<(String, ExecutionResult)> {
+    stream::iter(commands)
+        .then(|command| async move {
+            let result = execute_single_command(command, db, client, room, sender).await;
+            (command.to_owned(), result)
+        })
+        .collect()
+        .await
+}

dicebot/src/bot/event_handlers.rs

@@ -0,0 +1,163 @@
+use super::DiceBot;
+use crate::db::sqlite::Database;
+use crate::db::Rooms;
+use crate::error::BotError;
+use log::{debug, error, info, warn};
+use matrix_sdk::ruma::events::room::member::RoomMemberEventContent;
+use matrix_sdk::ruma::events::{StrippedStateEvent, SyncMessageLikeEvent};
+use matrix_sdk::{self, room::Room, ruma::events::room::message::RoomMessageEventContent};
+use matrix_sdk::{Client, DisplayName};
+use std::ops::Sub;
+use std::time::UNIX_EPOCH;
+use std::time::{Duration, SystemTime};
+
+/// Check if a message is recent enough to actually process. If the
+/// message is within "oldest_message_age" seconds, this function
+/// returns true. If it's older than that, it returns false and logs a
+/// debug message.
+fn check_message_age(
+    event: &SyncMessageLikeEvent<RoomMessageEventContent>,
+    oldest_message_age: u64,
+) -> bool {
+    let sending_time = event
+        .origin_server_ts()
+        .to_system_time()
+        .unwrap_or(UNIX_EPOCH);
+
+    let oldest_timestamp = SystemTime::now().sub(Duration::from_secs(oldest_message_age));
+
+    if sending_time > oldest_timestamp {
+        true
+    } else {
+        let age = match oldest_timestamp.duration_since(sending_time) {
+            Ok(n) => format!("{} seconds too old", n.as_secs()),
+            Err(_) => "before the UNIX epoch".to_owned(),
+        };
+
+        debug!("Ignoring message because it is {}: {:?}", age, event);
+        false
+    }
+}
+
+/// Determine whether or not to process a received message. This check
+/// is necessary in addition to the event processing check because we
+/// may receive message events when entering a room for the first
+/// time, and we don't want to respond to things before the bot was in
+/// the channel, but we do want to respond to things that were sent if
+/// the bot left and rejoined quickly.
+async fn should_process_message<'a>(
+    bot: &DiceBot,
+    event: &SyncMessageLikeEvent<RoomMessageEventContent>,
+) -> Result<(String, String), BotError> {
+    //Ignore messages that are older than configured duration.
+    if !check_message_age(event, bot.config.oldest_message_age()) {
+        let state_check = bot.state.read().unwrap();
+        if !((*state_check).logged_skipped_old_messages()) {
+            drop(state_check);
+            let mut state = bot.state.write().unwrap();
+            (*state).skipped_old_messages();
+        }
+
+        return Err(BotError::ShouldNotProcessError);
+    }
+
+    let msg_body: String = event
+        .as_original()
+        .map(|e| e.content.body())
+        .map(str::to_string)
+        .unwrap_or_else(|| String::new());
+
+    let sender_username: String = format!(
+        "@{}:{}",
+        event.sender().localpart(),
+        event.sender().server_name()
+    );
+
+    // Do not process messages from the bot itself. Otherwise it might
+    // try to execute its own commands.
+    let bot_username = bot
+        .client
+        .user_id()
+        .map(|u| format!("@{}:{}", u.localpart(), u.server_name()))
+        .unwrap_or_default();
+
+    if sender_username == bot_username {
+        return Err(BotError::ShouldNotProcessError);
+    }
+
+    Ok((msg_body, sender_username))
+}
+
+async fn should_process_event(db: &Database, room_id: &str, event_id: &str) -> bool {
+    db.should_process(room_id, event_id)
+        .await
+        .unwrap_or_else(|e| {
+            error!(
+                "Database error when checking if we should process an event: {}",
+                e.to_string()
+            );
+            false
+        })
+}
+
+pub(super) async fn on_stripped_state_member(
+    event: StrippedStateEvent<RoomMemberEventContent>,
+    client: Client,
+    room: Room,
+) {
+    let room = match room {
+        Room::Invited(invited_room) => invited_room,
+        _ => return,
+    };
+
+    if room.own_user_id().as_str() != event.state_key {
+        return;
+    }
+
+    info!(
+        "Autojoining room {}",
+        room.display_name()
+            .await
+            .ok()
+            .unwrap_or_else(|| DisplayName::Named("[error]".to_string()))
+    );
+
+    if let Err(e) = client.join_room_by_id(&room.room_id()).await {
+        warn!("Could not join room: {}", e.to_string())
+    }
+}
+
+pub(super) async fn on_room_message(
+    event: SyncMessageLikeEvent<RoomMessageEventContent>,
+    room: Room,
+    bot: DiceBot,
+) {
+    let room = match room {
+        Room::Joined(joined_room) => joined_room,
+        _ => return,
+    };
+
+    let room_id = room.room_id().as_str();
+    if !should_process_event(&bot.db, room_id, event.event_id().as_str()).await {
+        return;
+    }
+
+    let (msg_body, sender_username) =
+        if let Ok((msg_body, sender_username)) = should_process_message(&bot, &event).await {
+            (msg_body, sender_username)
+        } else {
+            return;
+        };
+
+    let results = bot
+        .execute_commands(&room, &sender_username, &msg_body)
+        .await;
+
+    bot.handle_results(
+        &room,
+        &sender_username,
+        event.event_id().to_owned(),
+        results,
+    )
+    .await;
+}

dicebot/src/bot/mod.rs

@@ -0,0 +1,172 @@
+use crate::commands::ExecutionResult;
+use crate::config::*;
+use crate::db::sqlite::Database;
+use crate::db::DbState;
+use crate::error::BotError;
+use crate::state::DiceBotState;
+use log::info;
+use matrix_sdk::room::Room;
+use matrix_sdk::ruma::events::room::message::RoomMessageEventContent;
+use matrix_sdk::ruma::events::SyncMessageLikeEvent;
+use matrix_sdk::ruma::OwnedEventId;
+use matrix_sdk::{self, room::Joined, Client};
+use matrix_sdk::config::SyncSettings;
+use std::clone::Clone;
+use std::sync::{Arc, RwLock};
+
+mod command_execution;
+pub mod event_handlers;
+
+/// How many commands can be in one message. If the amount is higher
+/// than this, we reject execution.
+const MAX_COMMANDS_PER_MESSAGE: usize = 50;
+
+/// The DiceBot struct represents an active dice bot. The bot is not
+/// connected to Matrix until its run() function is called.
+#[derive(Clone)]
+pub struct DiceBot {
+    /// A reference to the configuration read in on application start.
+    config: Arc<Config>,
+
+    /// The matrix client.
+    client: Client,
+
+    /// State of the dicebot
+    state: Arc<RwLock<DiceBotState>>,
+
+    /// Active database layer
+    db: Database,
+}
+
+impl DiceBot {
+    /// Create a new dicebot with the given configuration and state
+    /// actor. This function returns a Result because it is possible
+    /// for client creation to fail for some reason (e.g. invalid
+    /// homeserver URL).
+    pub fn new(
+        config: &Arc<Config>,
+        state: &Arc<RwLock<DiceBotState>>,
+        db: &Database,
+        client: &Client,
+    ) -> Result<Self, BotError> {
+        Ok(DiceBot {
+            client: client.clone(),
+            config: config.clone(),
+            state: state.clone(),
+            db: db.clone(),
+        })
+    }
+
+    /// Logs in to matrix and potentially records a new device ID. If
+    /// no device ID is found in the database, a new one will be
+    /// generated by the matrix SDK, and we will store it.
+    async fn login(&self, client: &Client) -> Result<(), BotError> {
+        let username = self.config.matrix_username();
+        let password = self.config.matrix_password();
+
+        // Pull device ID from database, if it exists. Then write it
+        // to DB if the library generated one for us.
+        let device_id: Option<String> = self.db.get_device_id().await?;
+        let device_id: Option<&str> = device_id.as_deref();
+
+        let no_device_ld_login = || client.login_username(username, password);
+        let device_id_login = |id| client.login_username(username, password).device_id(id);
+        let login = device_id.map_or_else(no_device_ld_login, device_id_login);
+
+        login.send().await?;
+
+        if device_id.is_none() {
+            let device_id = client.device_id().ok_or(BotError::NoDeviceIdFound)?;
+            self.db.set_device_id(device_id.as_str()).await?;
+            info!("Recorded new device ID: {}", device_id.as_str());
+        } else {
+            info!("Using existing device ID: {}", device_id.unwrap());
+        }
+
+        info!("Logged in as {}", username);
+        Ok(())
+    }
+
+    async fn bind_events(&self) {
+        //on room message: need closure to pass bot ref in.
+        self.client
+            .add_event_handler({
+                let bot: DiceBot = self.clone();
+                move |event: SyncMessageLikeEvent<RoomMessageEventContent>, room: Room| {
+                    let bot = bot.clone();
+                    async move { event_handlers::on_room_message(event, room, bot).await }
+                }
+            });
+
+        //auto-join handler
+        self.client
+            .add_event_handler(event_handlers::on_stripped_state_member);
+    }
+
+    /// Logs the bot in to Matrix and listens for events until program
+    /// terminated, or a panic occurs. Originally adapted from the
+    /// matrix-rust-sdk command bot example.
+    pub async fn run(self) -> Result<(), BotError> {
+        let client = self.client.clone();
+        self.login(&client).await?;
+        self.bind_events().await;
+
+        info!("Listening for commands");
+
+        // TODO replace with sync_with_callback for cleaner shutdown
+        // process.
+        client.sync(SyncSettings::default()).await?;
+        Ok(())
+    }
+
+    async fn execute_commands(
+        &self,
+        room: &Joined,
+        sender: &str,
+        msg_body: &str,
+    ) -> Vec<(String, ExecutionResult)> {
+        let commands: Vec<&str> = msg_body
+            .lines()
+            .filter(|line| line.starts_with("!"))
+            .take(MAX_COMMANDS_PER_MESSAGE + 1)
+            .collect();
+
+        //Up to 50 commands allowed, otherwise we send back an error.
+        let results: Vec<(String, ExecutionResult)> = if commands.len() < MAX_COMMANDS_PER_MESSAGE {
+            command_execution::execute(commands, &self.db, &self.client, room, sender).await
+        } else {
+            vec![("".to_owned(), Err(BotError::MessageTooLarge))]
+        };
+
+        results
+    }
+
+    pub async fn handle_results(
+        &self,
+        room: &Joined,
+        sender_username: &str,
+        event_id: OwnedEventId,
+        results: Vec<(String, ExecutionResult)>,
+    ) {
+        if results.len() >= 1 {
+            if results.len() == 1 {
+                command_execution::handle_single_result(
+                    &self.client,
+                    &results[0].1,
+                    sender_username,
+                    &room,
+                    event_id,
+                )
+                .await;
+            } else if results.len() > 1 {
+                command_execution::handle_multiple_results(
+                    &self.client,
+                    &results,
+                    sender_username,
+                    &room,
+                )
+                .await;
+            }
+        }
+    }
+}

dicebot/src/cofd/dice.rs

@@ -1,22 +1,9 @@
 use crate::context::Context;
-use crate::db::variables::UserAndRoom;
+use crate::error::{BotError, DiceRollingError};
-use crate::error::BotError;
+use crate::parser::dice::{Amount, Element, Operator};
-use crate::parser::{Amount, Element, Operator};
-use crate::roll::Rolled;
-use futures::stream::{self, StreamExt, TryStreamExt};
 use itertools::Itertools;
 use std::convert::TryFrom;
 use std::fmt;
-use thiserror::Error;
-
-#[derive(Error, Debug)]
-pub enum DiceRollingError {
-    #[error("variable not found: {0}")]
-    VariableNotFound(String),
-
-    #[error("dice pool expression too large")]
-    ExpressionTooLarge,
-}
 
 #[derive(Debug, PartialEq, Eq, Clone, Copy)]
 pub enum DicePoolQuality {
@@ -94,29 +81,6 @@ pub struct DicePool {
     pub(crate) modifiers: DicePoolModifiers,
 }
 
-async fn calculate_dice_amount(pool: &DicePoolWithContext<'_>) -> Result<i32, BotError> {
-    let stream = stream::iter(&pool.0.amounts);
-    let key = UserAndRoom(&pool.1.username, &pool.1.room_id);
-    let variables = &pool.1.db.variables.get_user_variables(&key)?;
-
-    use DiceRollingError::VariableNotFound;
-    let dice_amount: Result<i32, BotError> = stream
-        .then(|amount| async move {
-            match &amount.element {
-                Element::Number(num_dice) => Ok(*num_dice * amount.operator.mult()),
-                Element::Variable(variable) => variables
-                    .get(variable)
-                    .ok_or(VariableNotFound(variable.clone().to_string()))
-                    .map(|i| *i)
-                    .map_err(|e| e.into()),
-            }
-        })
-        .try_fold(0, |total, num_dice| async move { Ok(total + num_dice) })
-        .await;
-
-    dice_amount
-}
-
 impl DicePool {
     pub fn easy_pool(dice_amount: i32, quality: DicePoolQuality) -> DicePool {
         DicePool {
@@ -177,10 +141,11 @@ impl RolledDicePool {
 
 impl fmt::Display for RolledDicePool {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let dice_plural = if self.num_dice == 1 { "die" } else { "dice" };
         write!(
             f,
-            "{} dice ({}, exceptional on {} successes)",
+            "{} {} ({}, exceptional on {} successes)",
-            self.num_dice, self.modifiers.quality, self.modifiers.exceptional_on
+            self.num_dice, dice_plural, self.modifiers.quality, self.modifiers.exceptional_on
         )
     }
 }
@@ -192,18 +157,21 @@ pub struct DicePoolRoll {
     rolls: Vec<i32>,
 }
 
+/// Amount of dice to display before cutting off and showing "and X
+/// more", so we don't spam the room with huge messages.
+const MAX_DISPLAYED_ROLLS: usize = 15;
+
 fn fmt_rolls(pool: &DicePoolRoll) -> String {
-    let max_displayed_rolls = 15;
     let rolls = pool.rolls();
-    if rolls.len() > max_displayed_rolls {
+    if rolls.len() > MAX_DISPLAYED_ROLLS {
-        let first_ten = rolls.iter().take(max_displayed_rolls).join(", ");
+        let shown_amount = rolls.into_iter().take(MAX_DISPLAYED_ROLLS).join(", ");
         format!(
             "{}, and {} more",
-            first_ten,
+            shown_amount,
-            rolls.len() - max_displayed_rolls
+            rolls.len() - MAX_DISPLAYED_ROLLS
         )
     } else {
-        rolls.iter().take(10).join(", ")
+        rolls.into_iter().join(", ")
     }
 }
 
@@ -223,12 +191,12 @@ impl DicePoolRoll {
     }
 
     pub fn successes(&self) -> i32 {
-        let successes = self
+        let successes: usize = self
             .rolls
             .iter()
-            .cloned()
+            .filter(|&roll| *roll >= self.modifiers.success_on)
-            .filter(|&roll| roll >= self.modifiers.success_on)
             .count();
+
         i32::try_from(successes).unwrap_or(0)
     }
 
@@ -240,12 +208,6 @@ impl DicePoolRoll {
 /// Attach a Context to a dice pool. Needed for database access.
 pub struct DicePoolWithContext<'a>(pub &'a DicePool, pub &'a Context<'a>);
 
-impl Rolled for DicePoolRoll {
-    fn rolled_value(&self) -> i32 {
-        self.successes()
-    }
-}
-
 impl fmt::Display for DicePoolRoll {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         let successes = self.successes();
@@ -274,7 +236,7 @@ struct RngDieRoller<R: rand::Rng>(R);
 
 impl<R: rand::Rng> DieRoller for RngDieRoller<R> {
     fn roll_number(&mut self, sides: i32) -> i32 {
-        self.0.gen_range(1, sides + 1)
+        self.0.gen_range(1..=sides)
     }
 }
 
@@ -346,7 +308,7 @@ pub async fn roll_pool(pool: &DicePoolWithContext<'_>) -> Result<RolledDicePool,
         return Err(DiceRollingError::ExpressionTooLarge.into());
     }
 
-    let num_dice = calculate_dice_amount(&pool).await?;
+    let num_dice = crate::logic::calculate_dice_amount(&pool.0.amounts, &pool.1).await?;
     let mut roller = RngDieRoller(rand::thread_rng());
 
     if num_dice > 0 {
@@ -363,7 +325,19 @@ pub async fn roll_pool(pool: &DicePoolWithContext<'_>) -> Result<RolledDicePool,
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::db::Database;
+    use crate::db::sqlite::Database;
+    use crate::db::Variables;
+    use url::Url;
+
+    macro_rules! dummy_room {
+        () => {
+            crate::context::RoomContext {
+                id: &matrix_sdk::ruma::room_id!("!fakeroomid:example.com"),
+                display_name: "displayname".to_owned(),
+                secure: false,
+            }
+        };
+    }
 
     ///Instead of being random, generate a series of numbers we have complete
     ///control over.
@@ -491,8 +465,8 @@ mod tests {
         assert_eq!(vec![10], roll);
     }
 
-    #[tokio::test]
+    #[test]
-    async fn number_of_dice_equality_test() {
+    fn number_of_dice_equality_test() {
         let num_dice = 5;
         let rolls = vec![1, 2, 3, 4, 5];
         let pool = DicePool::easy_pool(5, DicePoolQuality::TenAgain);
@@ -500,10 +474,23 @@ mod tests {
         assert_eq!(5, rolled_pool.num_dice);
     }
 
-    #[tokio::test]
+    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
     async fn rejects_large_expression_test() {
-        let db = Database::new_temp().unwrap();
+        let db_path = tempfile::NamedTempFile::new_in(".").unwrap();
-        let ctx = Context::new(&db, "roomid", "username", "message");
+        let homeserver = Url::parse("http://example.com").unwrap();
+        let db = Database::new(db_path.path().to_str().unwrap())
+            .await
+            .unwrap();
+
+        let ctx = Context {
+            account: crate::models::Account::default(),
+            db: db,
+            matrix_client: matrix_sdk::Client::new(homeserver).await.unwrap(),
+            origin_room: dummy_room!(),
+            active_room: dummy_room!(),
+            username: "username",
+            message_body: "message",
+        };
 
         let mut amounts = vec![];
 
@@ -525,10 +512,27 @@ mod tests {
         ));
     }
 
-    #[tokio::test]
+    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
     async fn converts_to_chance_die_test() {
-        let db = Database::new_temp().unwrap();
+        let db_path = tempfile::NamedTempFile::new_in(".").unwrap();
-        let ctx = Context::new(&db, "roomid", "username", "message");
+        crate::db::sqlite::migrator::migrate(db_path.path().to_str().unwrap())
+            .await
+            .unwrap();
+
+        let db = Database::new(db_path.path().to_str().unwrap())
+            .await
+            .unwrap();
+
+        let homeserver = Url::parse("http://example.com").unwrap();
+        let ctx = Context {
+            account: crate::models::Account::default(),
+            db: db,
+            matrix_client: matrix_sdk::Client::new(homeserver).await.unwrap(),
+            origin_room: dummy_room!(),
+            active_room: dummy_room!(),
+            username: "username",
+            message_body: "message",
+        };
 
         let mut amounts = vec![];
 
@@ -547,15 +551,36 @@ mod tests {
         assert_eq!(1, roll.num_dice);
     }
 
-    #[tokio::test]
+    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
     async fn can_resolve_variables_test() {
-        let db = Database::new_temp().unwrap();
+        let db_path = tempfile::NamedTempFile::new_in(".").unwrap();
-        let ctx = Context::new(&db, "roomid", "username", "message");
+        crate::db::sqlite::migrator::migrate(db_path.path().to_str().unwrap())
-        let user_and_room = crate::db::variables::UserAndRoom(&ctx.username, &ctx.room_id);
+            .await
+            .unwrap();
 
-        db.variables
+        let db = Database::new(db_path.path().to_str().unwrap())
-            .set_user_variable(&user_and_room, "myvariable", 10)
+            .await
-            .expect("could not set myvariable to 10");
+            .unwrap();
+
+        let homeserver = Url::parse("http://example.com").unwrap();
+        let ctx = Context {
+            account: crate::models::Account::default(),
+            db: db.clone(),
+            matrix_client: matrix_sdk::Client::new(homeserver).await.unwrap(),
+            origin_room: dummy_room!(),
+            active_room: dummy_room!(),
+            username: "username",
+            message_body: "message",
+        };
+
+        db.set_user_variable(
+            &ctx.username,
+            &ctx.origin_room.id.as_str(),
+            "myvariable",
+            10,
+        )
+        .await
+        .expect("could not set myvariable to 10");
 
         let amounts = vec![Amount {
             operator: Operator::Plus,
@@ -563,9 +588,13 @@ mod tests {
         }];
 
         let pool = DicePool::new(amounts, DicePoolModifiers::default());
-        let pool_with_ctx = DicePoolWithContext(&pool, &ctx);
 
-        assert_eq!(calculate_dice_amount(&pool_with_ctx).await.unwrap(), 10);
+        assert_eq!(
+            crate::logic::calculate_dice_amount(&pool.amounts, &ctx)
+                .await
+                .unwrap(),
+            10
+        );
     }
 
     //DicePool tests
@@ -659,6 +688,30 @@ mod tests {
     }
 
     //Format tests
+    #[test]
+    fn formats_rolled_dice_pool_single_die() {
+        let pool = DicePool::easy_pool(5, DicePoolQuality::TenAgain);
+        let rolled_pool = RolledDicePool::from(&pool, 1, vec![1]);
+        let message = format!("{}", rolled_pool);
+        assert!(message.starts_with("1 die"));
+    }
+
+    #[test]
+    fn formats_rolled_dice_pool_multiple_dice() {
+        let pool = DicePool::easy_pool(5, DicePoolQuality::TenAgain);
+        let rolled_pool = RolledDicePool::from(&pool, 2, vec![1, 2]);
+        let message = format!("{}", rolled_pool);
+        assert!(message.starts_with("2 dice"));
+    }
+
+    #[test]
+    fn formats_rolled_dice_pool_zero_dice() {
+        let pool = DicePool::easy_pool(5, DicePoolQuality::TenAgain);
+        let rolled_pool = RolledDicePool::from(&pool, 0, vec![]);
+        let message = format!("{}", rolled_pool);
+        assert!(message.starts_with("0 dice"));
+    }
+
     #[test]
     fn formats_dramatic_failure_test() {
         let result = DicePoolRoll {
@@ -695,4 +748,32 @@ mod tests {
             fmt_rolls(&result)
         );
     }
+
+    #[test]
+    fn shows_more_than_10_dice_test() {
+        //Make sure we display more than 10 dice when below the display limit (15).
+        let result = DicePoolRoll {
+            modifiers: DicePoolModifiers::default(),
+            rolls: vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14],
+        };
+
+        assert_eq!(
+            "1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14",
+            fmt_rolls(&result)
+        );
+    }
+
+    #[test]
+    fn shows_exactly_15_dice_test() {
+        //If we are at format limit (15), make sure all are shown
+        let result = DicePoolRoll {
+            modifiers: DicePoolModifiers::default(),
+            rolls: vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15],
+        };
+
+        assert_eq!(
+            "1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15",
+            fmt_rolls(&result)
+        );
+    }
 }

dicebot/src/cofd/parser.rs

@@ -1,6 +1,6 @@
 use crate::cofd::dice::{DicePool, DicePoolModifiers, DicePoolQuality};
 use crate::error::BotError;
-use crate::parser::{parse_amounts, DiceParsingError};
+use crate::parser::dice::{parse_amounts, DiceParsingError};
 use combine::parser::char::{digit, spaces, string};
 use combine::{choice, count, many1, one_of, Parser};
 
@@ -45,13 +45,13 @@ pub fn parse_modifiers(input: &str) -> Result<DicePoolModifiers, DiceParsingErro
     let (result, rest) = parser.parse(input)?;
 
     if rest.len() == 0 {
-        convert_to_info(&result)
+        convert_to_modifiers(&result)
     } else {
         Err(DiceParsingError::UnconsumedInput)
     }
 }
 
-fn convert_to_info(parsed: &Vec<ParsedInfo>) -> Result<DicePoolModifiers, DiceParsingError> {
+fn convert_to_modifiers(parsed: &Vec<ParsedInfo>) -> Result<DicePoolModifiers, DiceParsingError> {
     use ParsedInfo::*;
     if parsed.len() == 0 {
         Ok(DicePoolModifiers::default())
@@ -79,19 +79,8 @@ fn convert_to_info(parsed: &Vec<ParsedInfo>) -> Result<DicePoolModifiers, DicePa
 }
 
 pub fn parse_dice_pool(input: &str) -> Result<DicePool, BotError> {
-    //The "modifiers:" part is optional. Assume amounts if no modifier
+    let (amounts, modifiers_str) = parse_amounts(input)?;
-    //section found.
-    let split = input.split(":").collect::<Vec<_>>();
-    let (modifiers_str, amounts_str) = (match split[..] {
-        [amounts] => Ok(("", amounts)),
-        [modifiers, amounts] => Ok((modifiers, amounts)),
-        _ => Err(BotError::DiceParsingError(
-            DiceParsingError::UnconsumedInput,
-        )),
-    })?;
-
     let modifiers = parse_modifiers(modifiers_str)?;
-    let amounts = parse_amounts(&amounts_str)?;
     Ok(DicePool::new(amounts, modifiers))
 }
 
@@ -175,7 +164,7 @@ mod tests {
 
     #[test]
     fn dice_pool_number_with_quality() {
-        let result = parse_dice_pool("n:8");
+        let result = parse_dice_pool("8 n");
         assert!(result.is_ok());
         assert_eq!(
             result.unwrap(),
@@ -186,7 +175,7 @@ mod tests {
     #[test]
     fn dice_pool_number_with_success_change() {
         let modifiers = DicePoolModifiers::custom_exceptional_on(3);
-        let result = parse_dice_pool("s3:8");
+        let result = parse_dice_pool("8 s3");
         assert!(result.is_ok());
         assert_eq!(result.unwrap(), DicePool::easy_with_modifiers(8, modifiers));
     }
@@ -194,14 +183,14 @@ mod tests {
     #[test]
     fn dice_pool_with_quality_and_success_change() {
         let modifiers = DicePoolModifiers::custom(DicePoolQuality::Rote, 3);
-        let result = parse_dice_pool("rs3:8");
+        let result = parse_dice_pool("8 rs3");
         assert!(result.is_ok());
         assert_eq!(result.unwrap(), DicePool::easy_with_modifiers(8, modifiers));
     }
 
     #[test]
     fn dice_pool_complex_expression_test() {
-        use crate::parser::*;
+        use crate::parser::dice::*;
         let modifiers = DicePoolModifiers::custom(DicePoolQuality::Rote, 3);
         let amounts = vec![
             Amount {
@@ -224,20 +213,20 @@ mod tests {
 
         let expected = DicePool::new(amounts, modifiers);
 
-        let result = parse_dice_pool("rs3:8+10-2+varname");
+        let result = parse_dice_pool("8+10-2+varname rs3");
         assert!(result.is_ok());
         assert_eq!(result.unwrap(), expected);
 
-        let result = parse_dice_pool("rs3:8+10-   2 + varname");
+        let result = parse_dice_pool("8+10-   2 + varname      rs3");
         assert!(result.is_ok());
         assert_eq!(result.unwrap(), expected);
 
-        let result = parse_dice_pool("rs3  :  8+ 10 -2 + varname");
+        let result = parse_dice_pool("8+ 10 -2 + varname           rs3");
         assert!(result.is_ok());
         assert_eq!(result.unwrap(), expected);
 
         //This one has tabs in it.
-        let result = parse_dice_pool("  r	s3  :	8	+ 10 -2 + varname");
+        let result = parse_dice_pool(" 	8	+ 10 -2 + varname	r	s3");
         assert!(result.is_ok());
         assert_eq!(result.unwrap(), expected);
     }

dicebot/src/commands/basic_rolling.rs

@@ -0,0 +1,48 @@
+use super::{Command, Execution, ExecutionResult};
+use crate::basic::dice::ElementExpression;
+use crate::basic::parser::parse_element_expression;
+use crate::basic::roll::Roll;
+use crate::context::Context;
+use crate::error::BotError;
+use async_trait::async_trait;
+use nom::Err as NomErr;
+use std::convert::TryFrom;
+
+pub struct RollCommand(pub ElementExpression);
+
+impl TryFrom<String> for RollCommand {
+    type Error = BotError;
+
+    fn try_from(input: String) -> Result<Self, Self::Error> {
+        let result = parse_element_expression(&input);
+        match result {
+            Ok((rest, expression)) if rest.len() == 0 => Ok(RollCommand(expression)),
+            //"Legacy code boundary": translates Nom errors into BotErrors.
+            Ok(_) => Err(BotError::NomParserIncomplete),
+            Err(NomErr::Error(e)) => Err(BotError::NomParserError(e.1)),
+            Err(NomErr::Failure(e)) => Err(BotError::NomParserError(e.1)),
+            Err(NomErr::Incomplete(_)) => Err(BotError::NomParserIncomplete),
+        }
+    }
+}
+
+#[async_trait]
+impl Command for RollCommand {
+    fn name(&self) -> &'static str {
+        "roll regular dice"
+    }
+
+    fn is_secure(&self) -> bool {
+        false
+    }
+
+    async fn execute(&self, _ctx: &Context<'_>) -> ExecutionResult {
+        let roll = self.0.roll();
+        let html = format!(
+            "<strong>Dice:</strong> {}</p><p><strong>Result</strong>: {}",
+            self.0, roll
+        );
+
+        Execution::success(html)
+    }
+}

dicebot/src/commands/cofd.rs

@@ -0,0 +1,48 @@
+use super::{Command, Execution, ExecutionResult};
+use crate::cofd::dice::{roll_pool, DicePool, DicePoolWithContext};
+use crate::cofd::parser::{create_chance_die, parse_dice_pool};
+use crate::context::Context;
+use crate::error::BotError;
+use async_trait::async_trait;
+use std::convert::TryFrom;
+
+pub struct PoolRollCommand(pub DicePool);
+
+impl PoolRollCommand {
+    pub fn chance_die() -> Result<PoolRollCommand, BotError> {
+        let pool = create_chance_die()?;
+        Ok(PoolRollCommand(pool))
+    }
+}
+
+impl TryFrom<String> for PoolRollCommand {
+    type Error = BotError;
+
+    fn try_from(input: String) -> Result<Self, Self::Error> {
+        let pool = parse_dice_pool(&input)?;
+        Ok(PoolRollCommand(pool))
+    }
+}
+
+#[async_trait]
+impl Command for PoolRollCommand {
+    fn name(&self) -> &'static str {
+        "roll dice pool"
+    }
+
+    fn is_secure(&self) -> bool {
+        false
+    }
+
+    async fn execute(&self, ctx: &Context<'_>) -> ExecutionResult {
+        let pool_with_ctx = DicePoolWithContext(&self.0, ctx);
+        let rolled_pool = roll_pool(&pool_with_ctx).await?;
+
+        let html = format!(
+            "<strong>Pool:</strong> {}</p><p><strong>Result</strong>: {}",
+            rolled_pool, rolled_pool.roll
+        );
+
+        Execution::success(html)
+    }
+}

dicebot/src/commands/cthulhu.rs

@@ -0,0 +1,77 @@
+use super::{Command, Execution, ExecutionResult};
+use crate::context::Context;
+use crate::cthulhu::dice::{
+    advancement_roll, regular_roll, AdvancementRoll, AdvancementRollWithContext, DiceRoll,
+    DiceRollWithContext,
+};
+use crate::cthulhu::parser::{parse_advancement_roll, parse_regular_roll};
+use crate::error::BotError;
+use async_trait::async_trait;
+use std::convert::TryFrom;
+
+pub struct CthRoll(pub DiceRoll);
+
+impl TryFrom<String> for CthRoll {
+    type Error = BotError;
+
+    fn try_from(input: String) -> Result<Self, Self::Error> {
+        let roll = parse_regular_roll(&input)?;
+        Ok(CthRoll(roll))
+    }
+}
+
+#[async_trait]
+impl Command for CthRoll {
+    fn name(&self) -> &'static str {
+        "roll percentile dice"
+    }
+
+    fn is_secure(&self) -> bool {
+        false
+    }
+
+    async fn execute(&self, ctx: &Context<'_>) -> ExecutionResult {
+        let roll_with_ctx = DiceRollWithContext(&self.0, ctx);
+        let executed_roll = regular_roll(&roll_with_ctx).await?;
+
+        let html = format!(
+            "<strong>Roll:</strong> {}</p><p><strong>Result</strong>: {}",
+            executed_roll, executed_roll.roll
+        );
+
+        Execution::success(html)
+    }
+}
+
+pub struct CthAdvanceRoll(pub AdvancementRoll);
+
+impl TryFrom<String> for CthAdvanceRoll {
+    type Error = BotError;
+
+    fn try_from(input: String) -> Result<Self, Self::Error> {
+        let roll = parse_advancement_roll(&input)?;
+        Ok(CthAdvanceRoll(roll))
+    }
+}
+
+#[async_trait]
+impl Command for CthAdvanceRoll {
+    fn name(&self) -> &'static str {
+        "roll skill advancement dice"
+    }
+
+    fn is_secure(&self) -> bool {
+        false
+    }
+
+    async fn execute(&self, ctx: &Context<'_>) -> ExecutionResult {
+        let roll_with_ctx = AdvancementRollWithContext(&self.0, ctx);
+        let executed_roll = advancement_roll(&roll_with_ctx).await?;
+        let html = format!(
+            "<strong>Roll:</strong> {}</p><p><strong>Result</strong>: {}",
+            executed_roll, executed_roll.roll
+        );
+
+        Execution::success(html)
+    }
+}

dicebot/src/commands/management.rs

@@ -0,0 +1,200 @@
+use super::{Command, Execution, ExecutionResult};
+use crate::db::Users;
+use crate::error::BotError::{AccountDoesNotExist, PasswordCreationError};
+use crate::logic::hash_password;
+use crate::models::{AccountStatus, User};
+use crate::{context::Context, error::BotError};
+use async_trait::async_trait;
+use std::convert::{Into, TryFrom};
+
+pub struct RegisterCommand;
+
+impl TryFrom<String> for RegisterCommand {
+    type Error = BotError;
+
+    fn try_from(_: String) -> Result<Self, Self::Error> {
+        Ok(RegisterCommand)
+    }
+}
+
+#[async_trait]
+impl Command for RegisterCommand {
+    fn name(&self) -> &'static str {
+        "register user account"
+    }
+
+    fn is_secure(&self) -> bool {
+        true
+    }
+
+    async fn execute(&self, ctx: &Context<'_>) -> ExecutionResult {
+        if ctx.account.is_registered() {
+            return Err(BotError::AccountAlreadyExists);
+        }
+
+        let user = User {
+            username: ctx.username.to_owned(),
+            password: None,
+            account_status: AccountStatus::Registered,
+            ..Default::default()
+        };
+
+        ctx.db.upsert_user(&user).await?;
+
+        Execution::success(format!(
+            "User account {} registered for bot commands.",
+            ctx.username
+        ))
+    }
+}
+
+pub struct UnlinkCommand(pub String);
+
+impl TryFrom<String> for UnlinkCommand {
+    type Error = BotError;
+
+    fn try_from(value: String) -> Result<Self, Self::Error> {
+        Ok(UnlinkCommand(value))
+    }
+}
+
+#[async_trait]
+impl Command for UnlinkCommand {
+    fn name(&self) -> &'static str {
+        "unlink user accountx from external applications"
+    }
+
+    fn is_secure(&self) -> bool {
+        true
+    }
+
+    async fn execute(&self, ctx: &Context<'_>) -> ExecutionResult {
+        let mut user = ctx
+            .db
+            .get_user(&ctx.username)
+            .await?
+            .ok_or(BotError::AccountDoesNotExist)?;
+
+        user.password = None;
+        ctx.db.upsert_user(&user).await?;
+
+        Execution::success(format!(
+            "Accounted {} is now inaccessible to external applications.",
+            ctx.username
+        ))
+    }
+}
+
+pub struct LinkCommand(pub String);
+
+impl TryFrom<String> for LinkCommand {
+    type Error = BotError;
+
+    fn try_from(value: String) -> Result<Self, Self::Error> {
+        Ok(LinkCommand(value))
+    }
+}
+
+#[async_trait]
+impl Command for LinkCommand {
+    fn name(&self) -> &'static str {
+        "link user account to external applications"
+    }
+
+    fn is_secure(&self) -> bool {
+        true
+    }
+
+    async fn execute(&self, ctx: &Context<'_>) -> ExecutionResult {
+        let mut user = ctx
+            .db
+            .get_user(&ctx.username)
+            .await?
+            .ok_or(BotError::AccountDoesNotExist)?;
+
+        let pw_hash = hash_password(&self.0).map_err(|e| PasswordCreationError(e))?;
+        user.password = Some(pw_hash);
+        ctx.db.upsert_user(&user).await?;
+
+        Execution::success(format!(
+            "Accounted now available for external use. Please log in to \
+             external applications with username {} and the password you set.",
+            ctx.username
+        ))
+    }
+}
+
+pub struct CheckCommand;
+
+impl TryFrom<String> for CheckCommand {
+    type Error = BotError;
+
+    fn try_from(_: String) -> Result<Self, Self::Error> {
+        Ok(CheckCommand)
+    }
+}
+
+#[async_trait]
+impl Command for CheckCommand {
+    fn name(&self) -> &'static str {
+        "check user account status"
+    }
+
+    fn is_secure(&self) -> bool {
+        true
+    }
+
+    async fn execute(&self, ctx: &Context<'_>) -> ExecutionResult {
+        let user = ctx.db.get_user(&ctx.username).await?;
+
+        match user {
+            Some(user) => match user.password {
+                Some(_) => Execution::success(
+                    "Account exists, and is available to external applications with a password. \
+                     If you forgot your password, change it with !link."
+                        .to_string(),
+                ),
+                None => Execution::success(
+                    "Account exists, but is not available to external applications.".to_string(),
+                ),
+            },
+            None => Execution::success(
+                "No account registered. Only simple commands in public rooms are available."
+                    .to_string(),
+            ),
+        }
+    }
+}
+
+pub struct UnregisterCommand;
+
+impl TryFrom<String> for UnregisterCommand {
+    type Error = BotError;
+
+    fn try_from(_: String) -> Result<Self, Self::Error> {
+        Ok(UnregisterCommand)
+    }
+}
+
+#[async_trait]
+impl Command for UnregisterCommand {
+    fn name(&self) -> &'static str {
+        "unregister user account"
+    }
+
+    fn is_secure(&self) -> bool {
+        true
+    }
+
+    async fn execute(&self, ctx: &Context<'_>) -> ExecutionResult {
+        let user = ctx.db.get_user(&ctx.username).await?;
+
+        match user {
+            Some(_) => {
+                ctx.db.delete_user(&ctx.username).await?;
+                Execution::success("Your user account has been removed.".to_string())
+            }
+            None => Err(AccountDoesNotExist.into()),
+        }
+    }
+}

dicebot/src/commands/misc.rs

@@ -0,0 +1,38 @@
+use super::{Command, Execution, ExecutionResult};
+use crate::context::Context;
+use crate::error::BotError;
+use crate::help::{parse_help_topic, HelpTopic};
+use async_trait::async_trait;
+use std::convert::TryFrom;
+
+pub struct HelpCommand(pub Option<HelpTopic>);
+
+impl TryFrom<String> for HelpCommand {
+    type Error = BotError;
+
+    fn try_from(input: String) -> Result<Self, Self::Error> {
+        let topic = parse_help_topic(&input);
+        Ok(HelpCommand(topic))
+    }
+}
+
+#[async_trait]
+impl Command for HelpCommand {
+    fn name(&self) -> &'static str {
+        "help information"
+    }
+
+    fn is_secure(&self) -> bool {
+        false
+    }
+
+    async fn execute(&self, _ctx: &Context<'_>) -> ExecutionResult {
+        let help = match &self.0 {
+            Some(topic) => topic.message(),
+            _ => "There is no help for this topic",
+        };
+
+        let html = format!("<strong>Help:</strong> {}", help.replace("\n", "<br/>"));
+        Execution::success(html)
+    }
+}

dicebot/src/commands/mod.rs

@@ -0,0 +1,301 @@
+use crate::context::Context;
+use crate::error::BotError;
+use async_trait::async_trait;
+use log::{error, info};
+use thiserror::Error;
+
+pub mod basic_rolling;
+pub mod cofd;
+pub mod cthulhu;
+pub mod management;
+pub mod misc;
+pub mod parser;
+pub mod rooms;
+pub mod variables;
+
+/// A custom error type specifically related to parsing command text.
+/// Does not wrap an execution failure.
+#[derive(Error, Debug)]
+pub enum CommandError {
+    #[error("invalid command: {0}")]
+    InvalidCommand(String),
+
+    #[error("command can only be executed from encrypted direct message")]
+    InsecureExecution,
+
+    #[error("ignored command")]
+    IgnoredCommand,
+}
+
+/// A successfully executed command returns a message to be sent back
+/// to the user in HTML (plain text used as a fallback by message
+/// formatter).
+#[derive(Debug)]
+pub struct Execution {
+    html: String,
+}
+
+impl Execution {
+    pub fn success(html: String) -> ExecutionResult {
+        Ok(Execution { html })
+    }
+
+    /// Response message in HTML.
+    pub fn html(&self) -> String {
+        self.html.clone()
+    }
+}
+
+/// Wraps either a successful command execution response, or an error
+/// that occurred.
+pub type ExecutionResult = Result<Execution, BotError>;
+
+/// Extract response messages out of a type, whether it is success or
+/// failure.
+pub trait ResponseExtractor {
+    /// HTML representation of the message, directly mentioning the
+    /// username.
+    fn message_html(&self, username: &str) -> String;
+
+    fn message_plain(&self, username: &str) -> String;
+}
+
+impl ResponseExtractor for ExecutionResult {
+    /// Error message in bolded HTML.
+    fn message_html(&self, username: &str) -> String {
+        // TODO use user display name too (element seems to render this
+        // without display name)
+        let username = format!(
+            "<a href=\"https://matrix.to/#/{}\">{}</a>",
+            username, username
+        );
+
+        match self {
+            Ok(resp) => format!("<p>{}</p>", resp.html).replace("\n", "<br/>"),
+            Err(e) => format!("<p>{}: <strong>{}</strong></p>", username, e).replace("\n", "<br/>"),
+        }
+    }
+
+    fn message_plain(&self, username: &str) -> String {
+        let message = match self {
+            Ok(resp) => format!("{}", resp.html),
+            Err(e) => format!("{}", e),
+        };
+
+        format!(
+            "{}:\n{}",
+            username,
+            html2text::from_read(message.as_bytes(), message.len())
+        )
+    }
+}
+
+/// The trait that any command that can be executed must implement.
+#[async_trait]
+pub trait Command: Send + Sync {
+    async fn execute(&self, ctx: &Context<'_>) -> ExecutionResult;
+    fn name(&self) -> &'static str;
+    fn is_secure(&self) -> bool;
+}
+
+/// Determine if we are allowed to execute this command. Currently the
+/// rules are that secure commands must be executed in secure rooms
+/// (encrypted + direct), and anything else can be executed where
+/// ever. Later, we can add stuff like admin/regular user power
+/// separation, etc.
+fn execution_allowed(cmd: &(impl Command + ?Sized), ctx: &Context<'_>) -> Result<(), CommandError> {
+    match cmd {
+        cmd if cmd.is_secure() && ctx.is_secure() => Ok(()),
+        cmd if cmd.is_secure() && !ctx.is_secure() => Err(CommandError::InsecureExecution),
+        _ => Ok(()),
+    }
+}
+
+/// Attempt to execute a command, and return the content that should
+/// go back to Matrix, if the command was executed, whether or not the
+/// command was successful.
+pub async fn execute_command(ctx: &Context<'_>) -> ExecutionResult {
+    let cmd = parser::parse_command(&ctx.message_body)?;
+
+    let result = match execution_allowed(cmd.as_ref(), ctx) {
+        Ok(_) => cmd.execute(ctx).await,
+        Err(e) => Err(e.into()),
+    };
+
+    log_command(cmd.as_ref(), ctx, &result);
+    result
+}
+
+/// Log result of an executed command.
+fn log_command(cmd: &(impl Command + ?Sized), ctx: &Context, result: &ExecutionResult) {
+    use substring::Substring;
+    let command = match cmd.is_secure() {
+        true => cmd.name(),
+        false => ctx.message_body,
+    };
+
+    let dots = match command.len() {
+        _len if _len > 30 => "[...]",
+        _ => "",
+    };
+
+    let command = command.substring(0, 30);
+
+    match result {
+        Ok(_) => {
+            info!(
+                "[{}] {} <{}{}> - success",
+                ctx.origin_room.display_name, ctx.username, command, dots
+            );
+        }
+        Err(e) => {
+            error!(
+                "[{}] {} <{}{}> - {}",
+                ctx.origin_room.display_name, ctx.username, command, dots, e
+            );
+        }
+    };
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use management::RegisterCommand;
+    use url::Url;
+    use matrix_sdk::ruma::room_id;
+
+    macro_rules! dummy_room {
+        () => {
+            crate::context::RoomContext {
+                id: &room_id!("!fakeroomid:example.com"),
+                display_name: "displayname".to_owned(),
+                secure: false,
+            }
+        };
+    }
+
+    macro_rules! secure_room {
+        () => {
+            crate::context::RoomContext {
+                id: &room_id!("!fakeroomid:example.com"),
+                display_name: "displayname".to_owned(),
+                secure: true,
+            }
+        };
+    }
+
+    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
+    async fn secure_context_secure_command_allows_execution() {
+        let db_path = tempfile::NamedTempFile::new_in(".").unwrap();
+        let db = crate::db::sqlite::Database::new(db_path.path().to_str().unwrap())
+            .await
+            .unwrap();
+
+        let homeserver = Url::parse("http://example.com").unwrap();
+
+        let ctx = Context {
+            account: crate::models::Account::default(),
+            db: db,
+            matrix_client: matrix_sdk::Client::new(homeserver).await.unwrap(),
+            origin_room: secure_room!(),
+            active_room: secure_room!(),
+            username: "myusername",
+            message_body: "!notacommand",
+        };
+
+        let cmd = RegisterCommand;
+        assert_eq!(execution_allowed(&cmd, &ctx).is_ok(), true);
+    }
+
+    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
+    async fn secure_context_insecure_command_allows_execution() {
+        let db_path = tempfile::NamedTempFile::new_in(".").unwrap();
+        let db = crate::db::sqlite::Database::new(db_path.path().to_str().unwrap())
+            .await
+            .unwrap();
+
+        let homeserver = Url::parse("http://example.com").unwrap();
+
+        let ctx = Context {
+            account: crate::models::Account::default(),
+            db: db,
+            matrix_client: matrix_sdk::Client::new(homeserver).await.unwrap(),
+            origin_room: secure_room!(),
+            active_room: secure_room!(),
+            username: "myusername",
+            message_body: "!notacommand",
+        };
+
+        let cmd = variables::GetVariableCommand("".to_owned());
+        assert_eq!(execution_allowed(&cmd, &ctx).is_ok(), true);
+    }
+
+    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
+    async fn insecure_context_insecure_command_allows_execution() {
+        let db_path = tempfile::NamedTempFile::new_in(".").unwrap();
+        let db = crate::db::sqlite::Database::new(db_path.path().to_str().unwrap())
+            .await
+            .unwrap();
+
+        let homeserver = Url::parse("http://example.com").unwrap();
+
+        let ctx = Context {
+            account: crate::models::Account::default(),
+            db: db,
+            matrix_client: matrix_sdk::Client::new(homeserver).await.unwrap(),
+            origin_room: dummy_room!(),
+            active_room: dummy_room!(),
+            username: "myusername",
+            message_body: "!notacommand",
+        };
+
+        let cmd = variables::GetVariableCommand("".to_owned());
+        assert_eq!(execution_allowed(&cmd, &ctx).is_ok(), true);
+    }
+
+    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
+    async fn insecure_context_secure_command_denies_execution() {
+        let db_path = tempfile::NamedTempFile::new_in(".").unwrap();
+        let db = crate::db::sqlite::Database::new(db_path.path().to_str().unwrap())
+            .await
+            .unwrap();
+
+        let homeserver = Url::parse("http://example.com").unwrap();
+
+        let ctx = Context {
+            account: crate::models::Account::default(),
+            db: db,
+            matrix_client: matrix_sdk::Client::new(homeserver).await.unwrap(),
+            origin_room: dummy_room!(),
+            active_room: dummy_room!(),
+            username: "myusername",
+            message_body: "!notacommand",
+        };
+
+        let cmd = RegisterCommand;
+        assert_eq!(execution_allowed(&cmd, &ctx).is_err(), true);
+    }
+
+    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
+    async fn unrecognized_command() {
+        let db_path = tempfile::NamedTempFile::new_in(".").unwrap();
+        let db = crate::db::sqlite::Database::new(db_path.path().to_str().unwrap())
+            .await
+            .unwrap();
+
+        let homeserver = Url::parse("http://example.com").unwrap();
+
+        let ctx = Context {
+            account: crate::models::Account::default(),
+            db: db,
+            matrix_client: matrix_sdk::Client::new(homeserver).await.unwrap(),
+            origin_room: dummy_room!(),
+            active_room: dummy_room!(),
+            username: "myusername",
+            message_body: "!notacommand",
+        };
+
+        let result = execute_command(&ctx).await;
+        assert!(result.is_err());
+    }
+}

dicebot/src/commands/parser.rs

@@ -1,22 +1,24 @@
-use crate::cofd::parser::{create_chance_die, parse_dice_pool};
+/**
+ * In addition to the terms of the AGPL, portions of this file are
+ * governed by the terms of the MIT license, from the original
+ * axfive-matrix-dicebot project.
+ */
 use crate::commands::{
     basic_rolling::RollCommand,
     cofd::PoolRollCommand,
     cthulhu::{CthAdvanceRoll, CthRoll},
+    management::{CheckCommand, LinkCommand, RegisterCommand, UnlinkCommand, UnregisterCommand},
     misc::HelpCommand,
+    rooms::{ListRoomsCommand, SetRoomCommand},
     variables::{
         DeleteVariableCommand, GetAllVariablesCommand, GetVariableCommand, SetVariableCommand,
     },
     Command,
 };
-use crate::cthulhu::parser::{parse_advancement_roll, parse_regular_roll};
-use crate::dice::parser::parse_element_expression;
 use crate::error::BotError;
-use crate::help::parse_help_topic;
-use crate::variables::parse_set_variable;
 use combine::parser::char::{char, letter, space};
 use combine::{any, many1, optional, Parser};
-use nom::Err as NomErr;
+use std::convert::TryFrom;
 use thiserror::Error;
 
 #[derive(Debug, Clone, PartialEq, Error)]
@@ -28,61 +30,6 @@ pub enum CommandParsingError {
     InternalParseError(#[from] combine::error::StringStreamError),
 }
 
-// Parse a roll expression.
-fn parse_roll(input: &str) -> Result<Box<dyn Command>, BotError> {
-    let result = parse_element_expression(input);
-    match result {
-        Ok((rest, expression)) if rest.len() == 0 => Ok(Box::new(RollCommand(expression))),
-        //Legacy code boundary translates nom errors into BotErrors.
-        Ok(_) => Err(BotError::NomParserIncomplete),
-        Err(NomErr::Error(e)) => Err(BotError::NomParserError(e.1)),
-        Err(NomErr::Failure(e)) => Err(BotError::NomParserError(e.1)),
-        Err(NomErr::Incomplete(_)) => Err(BotError::NomParserIncomplete),
-    }
-}
-
-fn parse_get_variable_command(input: &str) -> Result<Box<dyn Command>, BotError> {
-    Ok(Box::new(GetVariableCommand(input.to_owned())))
-}
-
-fn parse_set_variable_command(input: &str) -> Result<Box<dyn Command>, BotError> {
-    let (variable_name, value) = parse_set_variable(input)?;
-    Ok(Box::new(SetVariableCommand(variable_name, value)))
-}
-
-fn parse_delete_variable_command(input: &str) -> Result<Box<dyn Command>, BotError> {
-    Ok(Box::new(DeleteVariableCommand(input.to_owned())))
-}
-
-fn parse_pool_roll(input: &str) -> Result<Box<dyn Command>, BotError> {
-    let pool = parse_dice_pool(input)?;
-    Ok(Box::new(PoolRollCommand(pool)))
-}
-
-fn parse_cth_roll(input: &str) -> Result<Box<dyn Command>, BotError> {
-    let roll = parse_regular_roll(input)?;
-    Ok(Box::new(CthRoll(roll)))
-}
-
-fn parse_cth_advancement_roll(input: &str) -> Result<Box<dyn Command>, BotError> {
-    let roll = parse_advancement_roll(input)?;
-    Ok(Box::new(CthAdvanceRoll(roll)))
-}
-
-fn chance_die() -> Result<Box<dyn Command>, BotError> {
-    let pool = create_chance_die()?;
-    Ok(Box::new(PoolRollCommand(pool)))
-}
-
-fn get_all_variables() -> Result<Box<dyn Command>, BotError> {
-    Ok(Box::new(GetAllVariablesCommand))
-}
-
-fn help(topic: &str) -> Result<Box<dyn Command>, BotError> {
-    let topic = parse_help_topic(topic);
-    Ok(Box::new(HelpCommand(topic)))
-}
-
 /// Split an input string into its constituent command and "everything
 /// else" parts. Extracts the command separately from its input (i.e.
 /// rest of the line) and returns a tuple of (command_input, command).
@@ -114,23 +61,37 @@ fn split_command(input: &str) -> Result<(String, String), CommandParsingError> {
     Ok((command, command_input))
 }
 
+/// Atempt to convert text input to a Boxed command type. Shortens
+/// boilerplate.
+macro_rules! convert_to {
+    ($type:ident, $input: expr) => {
+        $type::try_from($input).map(|cmd| Box::new(cmd) as Box<dyn Command>)
+    };
+}
+
 /// Potentially parse a command expression. If we recognize the
 /// command, an error should be raised if the command is misparsed. If
-/// we don't recognize the command, ignore it and return None.
+/// we don't recognize the command, return an error.
 pub fn parse_command(input: &str) -> Result<Box<dyn Command>, BotError> {
     match split_command(input) {
-        Ok((cmd, cmd_input)) => match cmd.as_ref() {
+        Ok((cmd, cmd_input)) => match cmd.to_lowercase().as_ref() {
-            "variables" => get_all_variables(),
+            "variables" => convert_to!(GetAllVariablesCommand, cmd_input),
-            "get" => parse_get_variable_command(&cmd_input),
+            "get" => convert_to!(GetVariableCommand, cmd_input),
-            "set" => parse_set_variable_command(&cmd_input),
+            "set" => convert_to!(SetVariableCommand, cmd_input),
-            "del" => parse_delete_variable_command(&cmd_input),
+            "del" => convert_to!(DeleteVariableCommand, cmd_input),
-            "r" | "roll" => parse_roll(&cmd_input),
+            "r" | "roll" => convert_to!(RollCommand, cmd_input),
-            "rp" | "pool" => parse_pool_roll(&cmd_input),
+            "rp" | "pool" => convert_to!(PoolRollCommand, cmd_input),
-            "cthroll" | "cthRoll" => parse_cth_roll(&cmd_input),
+            "chance" => PoolRollCommand::chance_die().map(|cmd| Box::new(cmd) as Box<dyn Command>),
-            "cthadv" | "cthARoll" => parse_cth_advancement_roll(&cmd_input),
+            "cthroll" => convert_to!(CthRoll, cmd_input),
-            "chance" => chance_die(),
+            "cthadv" | "ctharoll" => convert_to!(CthAdvanceRoll, cmd_input),
-            "help" => help(&cmd_input),
+            "help" => convert_to!(HelpCommand, cmd_input),
-            // No recognized command, ignore this.
+            "register" => convert_to!(RegisterCommand, cmd_input),
+            "link" => convert_to!(LinkCommand, cmd_input),
+            "unlink" => convert_to!(UnlinkCommand, cmd_input),
+            "check" => convert_to!(CheckCommand, cmd_input),
+            "unregister" => convert_to!(UnregisterCommand, cmd_input),
+            "rooms" => convert_to!(ListRoomsCommand, cmd_input),
+            "room" => convert_to!(SetRoomCommand, cmd_input),
             _ => Err(CommandParsingError::UnrecognizedCommand(cmd).into()),
         },
         //All other errors passed up.
@@ -163,6 +124,21 @@ mod tests {
         assert!(result.is_err());
     }
 
+    #[test]
+    fn newline_test() {
+        assert!(parse_command("\n!roll 1d4").is_ok());
+    }
+
+    #[test]
+    fn whitespace_and_newline_test() {
+        assert!(parse_command("    \n!roll 1d4").is_ok());
+    }
+
+    #[test]
+    fn newline_and_whitespace_test() {
+        assert!(parse_command("\n    !cthroll 50").is_ok());
+    }
+
     #[test]
     fn word_with_exclamation_mark_test() {
         let result1 = parse_command("hello !notacommand");
@@ -225,4 +201,47 @@ mod tests {
         assert!(split_command("roll 1d4").is_err());
         assert!(split_command("roll").is_err());
     }
+
+    #[test]
+    fn chance_die_is_not_malformed() {
+        assert!(parse_command("!chance").is_ok());
+    }
+
+    #[test]
+    fn roll_malformed_expression_test() {
+        assert!(parse_command("!roll 1d20asdlfkj").is_err());
+        assert!(parse_command("!roll 1d20asdlfkj   ").is_err());
+    }
+
+    #[test]
+    fn roll_dice_pool_malformed_expression_test() {
+        assert!(parse_command("!pool 8abc").is_err());
+        assert!(parse_command("!pool 8abc    ").is_err());
+    }
+
+    #[test]
+    fn pool_whitespace_test() {
+        parse_command("!pool 8   ns3    ").expect("was error");
+        parse_command("   !pool 8 ns3").expect("was error");
+        parse_command("   !pool 8   ns3    ").expect("was error");
+    }
+
+    #[test]
+    fn help_whitespace_test() {
+        parse_command("!help stuff   ").expect("was error");
+        parse_command("   !help stuff").expect("was error");
+        parse_command("   !help stuff   ").expect("was error");
+    }
+
+    #[test]
+    fn roll_whitespace_test() {
+        parse_command("!roll 1d4 + 5d6 -3   ").expect("was error");
+        parse_command("!roll 1d4 + 5d6 -3   ").expect("was error");
+        parse_command("   !roll 1d4 + 5d6 -3   ").expect("was error");
+    }
+
+    #[test]
+    fn case_insensitive_test() {
+        parse_command("!CTHROLL 40").expect("command parsing is not case sensitive.");
+    }
 }

dicebot/src/commands/rooms.rs

@@ -0,0 +1,187 @@
+use super::{Command, Execution, ExecutionResult};
+use crate::context::Context;
+use crate::db::Users;
+use crate::error::BotError;
+use crate::matrix;
+use async_trait::async_trait;
+use fuse_rust::{Fuse, FuseProperty, Fuseable};
+use futures::stream::{self, StreamExt, TryStreamExt};
+use matrix_sdk::{ruma::OwnedUserId, Client};
+use std::convert::TryFrom;
+
+/// Holds matrix room ID and display name as strings, for use with
+/// searching. See search_for_room.
+#[derive(Clone, Debug, Eq, PartialEq)]
+struct RoomNameAndId {
+    id: String,
+    name: String,
+}
+
+/// Allows searching for a room name and ID struct, instead of just
+/// searching room display names directly.
+impl Fuseable for RoomNameAndId {
+    fn properties(&self) -> Vec<FuseProperty> {
+        vec![FuseProperty {
+            value: String::from("name"),
+            weight: 1.0,
+        }]
+    }
+
+    fn lookup(&self, key: &str) -> Option<&str> {
+        match key {
+            "name" => Some(&self.name),
+            _ => None,
+        }
+    }
+}
+
+/// Attempt to find a room by either name or Matrix Room ID query
+/// string. It prefers the exact room ID first, and then falls back to
+/// fuzzy searching based on room display name. The best match is
+/// returned, or None if no matches were found.
+fn search_for_room<'a>(
+    rooms_for_user: &'a [RoomNameAndId],
+    search_for: &str,
+) -> Option<&'a RoomNameAndId> {
+    //Lowest score is the best match.
+    let best_fuzzy_match = || -> Option<&RoomNameAndId> {
+        Fuse::default()
+            .search_text_in_fuse_list(search_for, &rooms_for_user)
+            .into_iter()
+            .min_by(|r1, r2| r1.score.partial_cmp(&r2.score).unwrap())
+            .and_then(|result| rooms_for_user.get(result.index))
+    };
+
+    rooms_for_user
+        .iter()
+        .find(|room| room.id == search_for)
+        .or_else(best_fuzzy_match)
+}
+
+async fn get_rooms_for_user(
+    client: &Client,
+    user_id: &str,
+) -> Result<Vec<RoomNameAndId>, BotError> {
+    let user_id = OwnedUserId::try_from(user_id)?;
+    let rooms_for_user = matrix::get_rooms_for_user(client, &user_id).await?;
+    let mut rooms_for_user: Vec<RoomNameAndId> = stream::iter(rooms_for_user)
+        .filter_map(|room| async move {
+            Some(room.display_name().await.map(|room_name| RoomNameAndId {
+                id: room.room_id().to_string(),
+                name: room_name.to_string(),
+            }))
+        })
+        .try_collect()
+        .await?;
+
+    //Alphabetically descending, symbols first, ignore case.
+    let sort = |r1: &RoomNameAndId, r2: &RoomNameAndId| {
+        r1.name.to_lowercase().cmp(&r2.name.to_lowercase())
+    };
+
+    rooms_for_user.sort_by(sort);
+    Ok(rooms_for_user)
+}
+
+pub struct ListRoomsCommand;
+
+impl TryFrom<String> for ListRoomsCommand {
+    type Error = BotError;
+
+    fn try_from(_: String) -> Result<Self, Self::Error> {
+        Ok(ListRoomsCommand)
+    }
+}
+
+#[async_trait]
+impl Command for ListRoomsCommand {
+    fn name(&self) -> &'static str {
+        "list rooms"
+    }
+
+    fn is_secure(&self) -> bool {
+        true
+    }
+
+    async fn execute(&self, ctx: &Context<'_>) -> ExecutionResult {
+        let rooms_for_user: Vec<String> = get_rooms_for_user(&ctx.matrix_client, ctx.username)
+            .await
+            .map(|rooms| {
+                rooms
+                    .into_iter()
+                    .map(|room| format!("  {}  |  {}", room.id, room.name))
+                    .collect()
+            })?;
+
+        let html = format!("<pre>{}</pre>", rooms_for_user.join("\n"));
+        Execution::success(html)
+    }
+}
+
+pub struct SetRoomCommand(String);
+
+impl TryFrom<String> for SetRoomCommand {
+    type Error = BotError;
+
+    fn try_from(input: String) -> Result<Self, Self::Error> {
+        Ok(SetRoomCommand(input))
+    }
+}
+
+#[async_trait]
+impl Command for SetRoomCommand {
+    fn name(&self) -> &'static str {
+        "set active room"
+    }
+
+    fn is_secure(&self) -> bool {
+        true
+    }
+
+    async fn execute(&self, ctx: &Context<'_>) -> ExecutionResult {
+        if !ctx.account.is_registered() {
+            return Err(BotError::AccountDoesNotExist);
+        }
+
+        let rooms_for_user = get_rooms_for_user(&ctx.matrix_client, ctx.username).await?;
+        let room = search_for_room(&rooms_for_user, &self.0);
+
+        if let Some(room) = room {
+            let mut new_user = ctx
+                .account
+                .registered_user()
+                .cloned()
+                .ok_or(BotError::AccountDoesNotExist)?;
+
+            new_user.active_room = Some(room.id.clone());
+            ctx.db.upsert_user(&new_user).await?;
+            Execution::success(format!(r#"Active room set to "{}""#, room.name))
+        } else {
+            Err(BotError::RoomDoesNotExist)
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
+    async fn set_room_prefers_room_id_over_name() {
+        let rooms = vec![
+            RoomNameAndId {
+                id: "roomid".to_string(),
+                name: "room_name".to_string(),
+            },
+            RoomNameAndId {
+                id: "anotherone".to_string(),
+                name: "roomid".to_string(),
+            },
+        ];
+
+        let found_room = search_for_room(&rooms, "roomid");
+
+        assert!(found_room.is_some());
+        assert_eq!(found_room.unwrap(), &rooms[0]);
+    }
+}

dicebot/src/commands/variables.rs

@@ -0,0 +1,161 @@
+use super::{Command, Execution, ExecutionResult};
+use crate::context::Context;
+use crate::db::errors::DataError;
+use crate::db::Variables;
+use crate::error::BotError;
+use async_trait::async_trait;
+use std::convert::TryFrom;
+
+pub struct GetAllVariablesCommand;
+
+impl TryFrom<String> for GetAllVariablesCommand {
+    type Error = BotError;
+
+    fn try_from(_: String) -> Result<Self, Self::Error> {
+        Ok(GetAllVariablesCommand)
+    }
+}
+
+#[async_trait]
+impl Command for GetAllVariablesCommand {
+    fn name(&self) -> &'static str {
+        "get all variables"
+    }
+
+    fn is_secure(&self) -> bool {
+        false
+    }
+
+    async fn execute(&self, ctx: &Context<'_>) -> ExecutionResult {
+        let variables = ctx
+            .db
+            .get_user_variables(&ctx.username, ctx.active_room_id().as_str())
+            .await?;
+
+        let mut variable_list: Vec<String> = variables
+            .into_iter()
+            .map(|(name, value)| format!(" - {} = {}", name, value))
+            .collect();
+
+        variable_list.sort();
+
+        let value = variable_list.join("\n");
+        let html = format!(
+            "<strong>Variables:</strong><br/>{}",
+            value.replace("\n", "<br/>")
+        );
+
+        Execution::success(html)
+    }
+}
+
+pub struct GetVariableCommand(pub String);
+
+impl TryFrom<String> for GetVariableCommand {
+    type Error = BotError;
+
+    fn try_from(input: String) -> Result<Self, Self::Error> {
+        Ok(GetVariableCommand(input))
+    }
+}
+
+#[async_trait]
+impl Command for GetVariableCommand {
+    fn name(&self) -> &'static str {
+        "retrieve variable value"
+    }
+
+    fn is_secure(&self) -> bool {
+        false
+    }
+
+    async fn execute(&self, ctx: &Context<'_>) -> ExecutionResult {
+        let name = &self.0;
+        let result = ctx
+            .db
+            .get_user_variable(&ctx.username, ctx.active_room_id().as_str(), name)
+            .await;
+
+        let value = match result {
+            Ok(num) => format!("{} = {}", name, num),
+            Err(DataError::KeyDoesNotExist(_)) => format!("{} is not set", name),
+            Err(e) => return Err(e.into()),
+        };
+
+        let html = format!("<strong>Variable:</strong> {}", value);
+        Execution::success(html)
+    }
+}
+
+pub struct SetVariableCommand(pub String, pub i32);
+
+impl TryFrom<String> for SetVariableCommand {
+    type Error = BotError;
+
+    fn try_from(input: String) -> Result<Self, Self::Error> {
+        let (variable_name, value) = crate::parser::variables::parse_set_variable(&input)?;
+        Ok(SetVariableCommand(variable_name, value))
+    }
+}
+
+#[async_trait]
+impl Command for SetVariableCommand {
+    fn name(&self) -> &'static str {
+        "set variable value"
+    }
+
+    fn is_secure(&self) -> bool {
+        false
+    }
+
+    async fn execute(&self, ctx: &Context<'_>) -> ExecutionResult {
+        let name = &self.0;
+        let value = self.1;
+
+        ctx.db
+            .set_user_variable(&ctx.username, ctx.active_room_id().as_str(), name, value)
+            .await?;
+
+        let content = format!("{} = {}", name, value);
+        let html = format!("<strong>Set Variable:</strong> {}", content);
+        Execution::success(html)
+    }
+}
+
+pub struct DeleteVariableCommand(pub String);
+
+impl TryFrom<String> for DeleteVariableCommand {
+    type Error = BotError;
+
+    fn try_from(input: String) -> Result<Self, Self::Error> {
+        Ok(DeleteVariableCommand(input))
+    }
+}
+
+#[async_trait]
+impl Command for DeleteVariableCommand {
+    fn name(&self) -> &'static str {
+        "delete variable"
+    }
+
+    fn is_secure(&self) -> bool {
+        false
+    }
+
+    async fn execute(&self, ctx: &Context<'_>) -> ExecutionResult {
+        let name = &self.0;
+        let result = ctx
+            .db
+            .delete_user_variable(&ctx.username, ctx.active_room_id().as_str(), name)
+            .await;
+
+        let value = match result {
+            Ok(()) => format!("{} now unset", name),
+            Err(DataError::KeyDoesNotExist(_)) => format!("{} is not currently set", name),
+            Err(e) => return Err(e.into()),
+        };
+
+        let html = format!("<strong>Remove Variable:</strong> {}", value);
+        Execution::success(html)
+    }
+}

dicebot/src/config.rs

@@ -4,10 +4,6 @@ use std::fs;
 use std::path::PathBuf;
 use thiserror::Error;
 
-/// Shortcut to defining db migration versions. Will probably
-/// eventually be moved to a config file.
-const MIGRATION_VERSION: u32 = 5;
-
 #[derive(Error, Debug)]
 pub enum ConfigError {
     #[error("i/o error: {0}")]
@@ -53,10 +49,19 @@ fn db_path_from_env() -> String {
 }
 
 /// The "bot" section of the config file, for bot settings.
-#[derive(Serialize, Deserialize, Clone, Debug)]
+#[derive(Serialize, Deserialize, Clone, Debug, Default)]
 struct BotConfig {
     /// How far back from current time should we process a message?
     oldest_message_age: Option<u64>,
+
+    /// What address and port to run the RPC service on. If not
+    /// specified, RPC will not be enabled.
+    rpc_addr: Option<String>,
+
+    /// The shared secret key between the bot and any RPC clients that
+    /// want to connect to it. The RPC server will reject any clients
+    /// that don't present the shared key.
+    rpc_key: Option<String>,
 }
 
 /// The "database" section of the config file.
@@ -84,6 +89,18 @@ impl BotConfig {
         self.oldest_message_age
             .unwrap_or(DEFAULT_OLDEST_MESSAGE_AGE)
     }
+
+    #[inline]
+    #[must_use]
+    fn rpc_addr(&self) -> Option<String> {
+        self.rpc_addr.clone()
+    }
+
+    #[inline]
+    #[must_use]
+    fn rpc_key(&self) -> Option<String> {
+        self.rpc_key.clone()
+    }
 }
 
 /// Represents the toml config file for the dicebot. The sections of
@@ -128,15 +145,6 @@ impl Config {
             .unwrap_or_else(|| db_path_from_env())
     }
 
-    /// The current migration version we expect of the database. If
-    /// this number is higher than the one in the database, we will
-    /// execute migrations to update the data.
-    #[inline]
-    #[must_use]
-    pub fn migration_version(&self) -> u32 {
-        MIGRATION_VERSION
-    }
-
     /// Figure out the allowed oldest message age, in seconds. This will
     /// be the defined oldest message age in the bot config, if the bot
     /// configuration and associated "oldest_message_age" setting are
@@ -150,6 +158,18 @@ impl Config {
             .map(|bc| bc.oldest_message_age())
             .unwrap_or(DEFAULT_OLDEST_MESSAGE_AGE)
     }
+
+    #[inline]
+    #[must_use]
+    pub fn rpc_addr(&self) -> Option<String> {
+        self.bot.as_ref().and_then(|bc| bc.rpc_addr())
+    }
+
+    #[inline]
+    #[must_use]
+    pub fn rpc_key(&self) -> Option<String> {
+        self.bot.as_ref().and_then(|bc| bc.rpc_key())
+    }
 }
 
 #[cfg(test)]
@@ -169,6 +189,7 @@ mod tests {
             }),
             bot: Some(BotConfig {
                 oldest_message_age: None,
+                ..Default::default()
             }),
         };
 

dicebot/src/context.rs

@@ -0,0 +1,76 @@
+use crate::db::sqlite::Database;
+use crate::error::BotError;
+use crate::models::Account;
+use matrix_sdk::room::Joined;
+use matrix_sdk::ruma::{RoomId, UserId};
+use matrix_sdk::Client;
+use std::convert::TryFrom;
+
+/// A context carried through the system providing access to things
+/// like the database.
+#[derive(Clone)]
+pub struct Context<'a> {
+    pub db: Database,
+    pub matrix_client: Client,
+    pub origin_room: RoomContext<'a>,
+    pub active_room: RoomContext<'a>,
+    pub username: &'a str,
+    pub message_body: &'a str,
+    pub account: Account,
+}
+
+impl Context<'_> {
+    pub fn active_room_id(&self) -> &RoomId {
+        self.active_room.id
+    }
+
+    pub fn room_id(&self) -> &RoomId {
+        self.origin_room.id
+    }
+
+    pub fn is_secure(&self) -> bool {
+        self.origin_room.secure
+    }
+}
+
+#[derive(Clone)]
+pub struct RoomContext<'a> {
+    pub id: &'a RoomId,
+    pub display_name: String,
+    pub secure: bool,
+}
+
+impl RoomContext<'_> {
+    pub async fn new_with_name<'a>(
+        room: &'a Joined,
+        sending_user: &str,
+    ) -> Result<RoomContext<'a>, BotError> {
+        // TODO is_direct is a hack; the bot should set eligible rooms
+        // to Direct Message upon joining, if other contact has
+        // requested it. Waiting on SDK support.
+        let display_name =
+            room
+            .display_name()
+            .await
+            .ok()
+            .map(|d| d.to_string())
+            .unwrap_or_default();
+
+        let sending_user = <&UserId>::try_from(sending_user)?;
+        let user_in_room = room.get_member(sending_user).await.ok().is_some();
+        let is_direct = room.active_members().await?.len() == 2;
+
+        Ok(RoomContext {
+            id: room.room_id(),
+            display_name,
+            secure: room.is_encrypted() && is_direct && user_in_room,
+        })
+    }
+
+    pub async fn new<'a>(
+        room: &'a Joined,
+        sending_user: &'a str,
+    ) -> Result<RoomContext<'a>, BotError> {
+        Self::new_with_name(room, sending_user).await
+    }
+}

dicebot/src/cthulhu/dice.rs

@@ -1,19 +1,22 @@
+use crate::context::Context;
+use crate::db::Variables;
+use crate::error::{BotError, DiceRollingError};
+use crate::logic::calculate_single_die_amount;
+use crate::parser::dice::{Amount, DiceParsingError, Element};
+use rand::rngs::StdRng;
+use rand::Rng;
+use rand::SeedableRng;
+use std::convert::TryFrom;
 use std::fmt;
 
 /// A planned dice roll.
-#[derive(Clone, Copy, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq)]
 pub struct DiceRoll {
-    pub target: u32,
+    pub amount: Amount,
     pub modifier: DiceRollModifier,
 }
 
-impl fmt::Display for DiceRoll {
+pub struct DiceRollWithContext<'a>(pub &'a DiceRoll, pub &'a Context<'a>);
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        let message = format!("target: {}, with {}", self.target, self.modifier);
-        write!(f, "{}", message)?;
-        Ok(())
-    }
-}
 
 /// Potential modifier on the die roll to be made.
 #[derive(Clone, Copy, Debug, PartialEq)]
@@ -91,6 +94,51 @@ impl fmt::Display for RollResult {
     }
 }
 
+/// A struct wrapping the target and the actual dice roll result. This
+/// is done for formatting purposes, so we can display the target
+/// number (calculated from resolving variables) separately from the
+/// result.
+pub struct ExecutedDiceRoll {
+    /// The number we must meet for the roll to be considered a
+    /// success.
+    pub target: u32,
+
+    /// Stored for informational purposes in display.
+    pub modifier: DiceRollModifier,
+
+    /// The actual roll result.
+    pub roll: RolledDice,
+}
+
+impl fmt::Display for ExecutedDiceRoll {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let message = format!("target: {}, with {}", self.target, self.modifier);
+        write!(f, "{}", message)?;
+        Ok(())
+    }
+}
+
+/// A struct wrapping the target and the actual advancement roll
+/// result. This is done for formatting purposes, so we can display
+/// the target number (calculated from resolving variables) separately
+/// from the result.
+pub struct ExecutedAdvancementRoll {
+    /// The number we must exceed for the roll to be considered a
+    /// success.
+    pub target: u32,
+
+    /// The actual roll result.
+    pub roll: RolledAdvancement,
+}
+
+impl fmt::Display for ExecutedAdvancementRoll {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let message = format!("target: {}", self.target);
+        write!(f, "{}", message)?;
+        Ok(())
+    }
+}
+
 //TODO need to keep track of all rolled numbers for informational purposes!
 /// The outcome of a roll.
 pub struct RolledDice {
@@ -100,10 +148,6 @@ pub struct RolledDice {
     /// The number we must meet for the roll to be considered a
     /// success.
     target: u32,
-
-    /// Stored for informational purposes in display.
-    #[allow(dead_code)]
-    modifier: DiceRollModifier,
 }
 
 impl RolledDice {
@@ -144,21 +188,25 @@ impl fmt::Display for RolledDice {
 
 /// A planned advancement roll, where the target number is the
 /// existing skill amount.
-#[derive(Clone, Copy, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq)]
 pub struct AdvancementRoll {
     /// The amount (0 to 100) of the existing skill. We must beat this
     /// target number to advance the skill, or roll above a 95.
-    pub existing_skill: u32,
+    pub existing_skill: Amount,
 }
 
 impl fmt::Display for AdvancementRoll {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        let message = format!("advancement for skill of {}", self.existing_skill);
+        let message = format!("advancement for skill of {:?}", self.existing_skill);
         write!(f, "{}", message)?;
         Ok(())
     }
 }
 
+/// A struct holding an advancement roll and the context, so we can
+/// translate variables to numbers.
+pub struct AdvancementRollWithContext<'a>(pub &'a AdvancementRoll, pub &'a Context<'a>);
+
 /// A completed advancement roll.
 pub struct RolledAdvancement {
     existing_skill: u32,
@@ -207,16 +255,32 @@ impl fmt::Display for RolledAdvancement {
     }
 }
 
+/// This is a trait so we can inject controlled dice rolls in unit
+/// tests.
 trait DieRoller {
     fn roll(&mut self) -> u32;
 }
 
-///A version of DieRoller that uses a rand::Rng to roll numbers.
+/// Macro to determine if an Amount is a variable.
-struct RngDieRoller<R: rand::Rng>(R);
+macro_rules! is_variable {
+    ($existing_skill:ident) => {
+        matches!(
+            $existing_skill,
+            Amount {
+                element: Element::Variable(_),
+                ..
+            }
+        )
+    };
+}
 
-impl<R: rand::Rng> DieRoller for RngDieRoller<R> {
+/// A die roller than can have an RNG implementation injected, but
+/// must be thread-safe. Required for the async dice rolling code.
+struct RngDieRoller<R: Rng + ?Sized + Send>(R);
+
+impl<R: Rng + ?Sized + Send> DieRoller for RngDieRoller<R> {
     fn roll(&mut self) -> u32 {
-        self.0.gen_range(0, 10)
+        self.0.gen_range(0..=9)
     }
 }
 
@@ -235,9 +299,14 @@ fn roll_percentile_dice<R: DieRoller>(roller: &mut R, unit_roll: u32) -> u32 {
     }
 }
 
-fn roll_regular_dice<R: DieRoller>(roll: &DiceRoll, roller: &mut R) -> RolledDice {
+fn roll_regular_dice<R: DieRoller>(
+    modifier: &DiceRollModifier,
+    target: u32,
+    roller: &mut R,
+) -> RolledDice {
     use DiceRollModifier::*;
-    let num_rolls = match roll.modifier {
+
+    let num_rolls = match modifier {
         Normal => 1,
         OneBonus | OnePenalty => 2,
         TwoBonus | TwoPenalty => 3,
@@ -249,7 +318,7 @@ fn roll_regular_dice<R: DieRoller>(roll: &DiceRoll, roller: &mut R) -> RolledDic
         .map(|_| roll_percentile_dice(roller, unit_roll))
         .collect();
 
-    let num_rolled = match roll.modifier {
+    let num_rolled = match modifier {
         Normal => rolls.first(),
         OneBonus | TwoBonus => rolls.iter().min(),
         OnePenalty | TwoPenalty => rolls.iter().max(),
@@ -257,61 +326,118 @@ fn roll_regular_dice<R: DieRoller>(roll: &DiceRoll, roller: &mut R) -> RolledDic
     .unwrap();
 
     RolledDice {
-        modifier: roll.modifier,
         num_rolled: *num_rolled,
-        target: roll.target,
+        target: target,
     }
 }
 
-fn roll_advancement_dice<R: DieRoller>(
+fn roll_advancement_dice<R: DieRoller>(target: u32, roller: &mut R) -> RolledAdvancement {
-    roll: &AdvancementRoll,
-    roller: &mut R,
-) -> RolledAdvancement {
     let unit_roll = roller.roll();
     let percentile_roll = roll_percentile_dice(roller, unit_roll);
 
-    if percentile_roll > roll.existing_skill || percentile_roll > 95 {
+    if percentile_roll > target || percentile_roll > 95 {
         RolledAdvancement {
             num_rolled: percentile_roll,
-            existing_skill: roll.existing_skill,
+            existing_skill: target,
             advancement: roller.roll() + 1,
             successful: true,
         }
     } else {
         RolledAdvancement {
             num_rolled: percentile_roll,
-            existing_skill: roll.existing_skill,
+            existing_skill: target,
             advancement: 0,
             successful: false,
         }
     }
 }
 
-impl DiceRoll {
+/// Make a roll with a target number and potential modifier. In a
-    /// Make a roll with a target number and potential modifier. In a
+/// normal roll, only one percentile die is rolled (1d100). With
-    /// normal roll, only one percentile die is rolled (1d100). With
+/// bonuses or penalties, more dice are rolled, and either the lowest
-    /// bonuses or penalties, more dice are rolled, and either the lowest
+/// (in case of bonus) or highest (in case of penalty) result is
-    /// (in case of bonus) or highest (in case of penalty) result is
+/// picked. Rolls are not simply d100; the unit roll (ones place) is
-    /// picked. Rolls are not simply d100; the unit roll (ones place) is
+/// rolled separately from the tens place, and then the unit number is
-    /// rolled separately from the tens place, and then the unit number is
+/// added to each potential roll before picking the lowest/highest
-    /// added to each potential roll before picking the lowest/highest
+/// result.
-    /// result.
+pub async fn regular_roll(
-    pub fn roll(&self) -> RolledDice {
+    roll_with_ctx: &DiceRollWithContext<'_>,
-        let mut roller = RngDieRoller(rand::thread_rng());
+) -> Result<ExecutedDiceRoll, BotError> {
-        roll_regular_dice(&self, &mut roller)
+    let target = calculate_single_die_amount(&roll_with_ctx.0.amount, roll_with_ctx.1).await?;
-    }
+    let target = u32::try_from(target).map_err(|_| DiceRollingError::InvalidAmount)?;
+
+    let mut roller = RngDieRoller::<StdRng>(SeedableRng::from_entropy());
+    let rolled_dice = roll_regular_dice(&roll_with_ctx.0.modifier, target, &mut roller);
+
+    Ok(ExecutedDiceRoll {
+        target,
+        modifier: roll_with_ctx.0.modifier,
+        roll: rolled_dice,
+    })
 }
 
-impl AdvancementRoll {
+async fn update_skill(ctx: &Context<'_>, variable: &str, value: u32) -> Result<(), BotError> {
-    pub fn roll(&self) -> RolledAdvancement {
+    use std::convert::TryInto;
-        let mut roller = RngDieRoller(rand::thread_rng());
+    let value: i32 = value.try_into()?;
-        roll_advancement_dice(self, &mut roller)
+    ctx.db
+        .set_user_variable(
+            &ctx.username,
+            &ctx.active_room_id().as_str(),
+            variable,
+            value,
+        )
+        .await?;
+    Ok(())
+}
+
+fn extract_variable(amount: &Amount) -> Result<&str, DiceParsingError> {
+    match amount.element {
+        Element::Variable(ref varname) => Ok(&varname[..]),
+        _ => Err(DiceParsingError::WrongElementType),
     }
 }
+pub async fn advancement_roll(
+    roll_with_ctx: &AdvancementRollWithContext<'_>,
+) -> Result<ExecutedAdvancementRoll, BotError> {
+    let existing_skill = &roll_with_ctx.0.existing_skill;
+    let target = calculate_single_die_amount(existing_skill, roll_with_ctx.1).await?;
+
+    let target = u32::try_from(target).map_err(|_| DiceRollingError::InvalidAmount)?;
+
+    if target > 100 {
+        return Err(DiceRollingError::InvalidAmount.into());
+    }
+
+    let mut roller = RngDieRoller::<StdRng>(SeedableRng::from_entropy());
+    let roll = roll_advancement_dice(target, &mut roller);
+
+    drop(roller);
+
+    if roll.successful && is_variable!(existing_skill) {
+        let variable_name: &str = extract_variable(existing_skill)?;
+        update_skill(roll_with_ctx.1, variable_name, roll.new_skill_amount()).await?;
+    }
+
+    Ok(ExecutedAdvancementRoll { target, roll })
+}
 
 #[cfg(test)]
 mod tests {
     use super::*;
+    use crate::db::sqlite::Database;
+    use crate::parser::dice::{Amount, Element, Operator};
+    use url::Url;
+    use matrix_sdk::ruma::room_id;
+
+    macro_rules! dummy_room {
+        () => {
+            crate::context::RoomContext {
+                id: &room_id!("!fakeroomid:example.com"),
+                display_name: "displayname".to_owned(),
+                secure: false,
+            }
+        };
+    }
 
     /// Generate a series of numbers manually for testing. For this
     /// die system, the first roll in the Vec should be the unit roll,
@@ -325,7 +451,7 @@ mod tests {
     impl SequentialDieRoller {
         fn new(results: Vec<u32>) -> SequentialDieRoller {
             SequentialDieRoller {
-                results: results,
+                results,
                 position: 0,
             }
         }
@@ -340,204 +466,287 @@ mod tests {
     }
 
     #[test]
-    fn regular_roll_succeeds_when_below_target() {
+    fn extract_variable_gets_variable_name() {
+        let amount = Amount {
+            operator: Operator::Plus,
+            element: Element::Variable("abc".to_string()),
+        };
+
+        let result = extract_variable(&amount);
+
+        assert!(result.is_ok());
+        assert_eq!(result.unwrap(), "abc");
+    }
+
+    #[test]
+    fn extract_variable_fails_on_number() {
+        let result = extract_variable(&Amount {
+            operator: Operator::Plus,
+            element: Element::Number(1),
+        });
+
+        assert!(result.is_err());
+        assert!(matches!(result, Err(DiceParsingError::WrongElementType)));
+    }
+
+    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
+    async fn regular_roll_rejects_negative_numbers() {
         let roll = DiceRoll {
-            target: 50,
+            amount: Amount {
+                operator: Operator::Plus,
+                element: Element::Number(-10),
+            },
             modifier: DiceRollModifier::Normal,
         };
 
+        let db_path = tempfile::NamedTempFile::new_in(".").unwrap();
+        crate::db::sqlite::migrator::migrate(db_path.path().to_str().unwrap())
+            .await
+            .unwrap();
+
+        let db = Database::new(db_path.path().to_str().unwrap())
+            .await
+            .unwrap();
+
+        let homeserver = Url::parse("http://example.com").unwrap();
+        let ctx = Context {
+            account: crate::models::Account::default(),
+            db: db,
+            matrix_client: matrix_sdk::Client::new(homeserver).await.unwrap(),
+            origin_room: dummy_room!(),
+            active_room: dummy_room!(),
+            username: "username",
+            message_body: "message",
+        };
+
+        let roll_with_ctx = DiceRollWithContext(&roll, &ctx);
+        let result = regular_roll(&roll_with_ctx).await;
+        assert!(result.is_err());
+        assert!(matches!(
+            result,
+            Err(BotError::DiceRollingError(DiceRollingError::InvalidAmount))
+        ));
+    }
+
+    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
+    async fn advancement_roll_rejects_negative_numbers() {
+        let roll = AdvancementRoll {
+            existing_skill: Amount {
+                operator: Operator::Plus,
+                element: Element::Number(-10),
+            },
+        };
+
+        let db_path = tempfile::NamedTempFile::new_in(".").unwrap();
+        crate::db::sqlite::migrator::migrate(db_path.path().to_str().unwrap())
+            .await
+            .unwrap();
+
+        let db = Database::new(db_path.path().to_str().unwrap())
+            .await
+            .unwrap();
+
+        let homeserver = Url::parse("http://example.com").unwrap();
+        let ctx = Context {
+            account: crate::models::Account::default(),
+            db: db,
+            matrix_client: matrix_sdk::Client::new(homeserver).await.unwrap(),
+            origin_room: dummy_room!(),
+            active_room: dummy_room!(),
+            username: "username",
+            message_body: "message",
+        };
+
+        let roll_with_ctx = AdvancementRollWithContext(&roll, &ctx);
+        let result = advancement_roll(&roll_with_ctx).await;
+        assert!(result.is_err());
+        assert!(matches!(
+            result,
+            Err(BotError::DiceRollingError(DiceRollingError::InvalidAmount))
+        ));
+    }
+
+    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
+    async fn advancement_roll_rejects_big_numbers() {
+        let roll = AdvancementRoll {
+            existing_skill: Amount {
+                operator: Operator::Plus,
+                element: Element::Number(3000),
+            },
+        };
+
+        let db_path = tempfile::NamedTempFile::new_in(".").unwrap();
+        crate::db::sqlite::migrator::migrate(db_path.path().to_str().unwrap())
+            .await
+            .unwrap();
+
+        let db = Database::new(db_path.path().to_str().unwrap())
+            .await
+            .unwrap();
+
+        let homeserver = Url::parse("http://example.com").unwrap();
+        let ctx = Context {
+            account: crate::models::Account::default(),
+            db: db,
+            matrix_client: matrix_sdk::Client::new(homeserver).await.unwrap(),
+            origin_room: dummy_room!(),
+            active_room: dummy_room!(),
+            username: "username",
+            message_body: "message",
+        };
+
+        let roll_with_ctx = AdvancementRollWithContext(&roll, &ctx);
+        let result = advancement_roll(&roll_with_ctx).await;
+        assert!(result.is_err());
+        assert!(matches!(
+            result,
+            Err(BotError::DiceRollingError(DiceRollingError::InvalidAmount))
+        ));
+    }
+
+    #[test]
+    fn is_variable_macro_succeds_on_variable() {
+        let amount = Amount {
+            operator: Operator::Plus,
+            element: Element::Variable("abc".to_string()),
+        };
+
+        assert_eq!(is_variable!(amount), true);
+    }
+
+    #[test]
+    fn is_variable_macro_fails_on_number() {
+        let amount = Amount {
+            operator: Operator::Plus,
+            element: Element::Number(1),
+        };
+
+        assert_eq!(is_variable!(amount), false);
+    }
+
+    #[test]
+    fn regular_roll_succeeds_when_below_target() {
         //Roll 30, succeeding.
         let mut roller = SequentialDieRoller::new(vec![0, 3]);
-        let rolled = roll_regular_dice(&roll, &mut roller);
+        let rolled = roll_regular_dice(&DiceRollModifier::Normal, 50, &mut roller);
         assert_eq!(RollResult::Success, rolled.result());
     }
 
     #[test]
     fn regular_roll_hard_success_when_rolling_half() {
-        let roll = DiceRoll {
-            target: 50,
-            modifier: DiceRollModifier::Normal,
-        };
-
         //Roll 25, succeeding.
         let mut roller = SequentialDieRoller::new(vec![5, 2]);
-        let rolled = roll_regular_dice(&roll, &mut roller);
+        let rolled = roll_regular_dice(&DiceRollModifier::Normal, 50, &mut roller);
         assert_eq!(RollResult::HardSuccess, rolled.result());
     }
 
     #[test]
     fn regular_roll_extreme_success_when_rolling_one_fifth() {
-        let roll = DiceRoll {
-            target: 50,
-            modifier: DiceRollModifier::Normal,
-        };
-
         //Roll 10, succeeding extremely.
         let mut roller = SequentialDieRoller::new(vec![0, 1]);
-        let rolled = roll_regular_dice(&roll, &mut roller);
+        let rolled = roll_regular_dice(&DiceRollModifier::Normal, 50, &mut roller);
         assert_eq!(RollResult::ExtremeSuccess, rolled.result());
     }
 
     #[test]
     fn regular_roll_extreme_success_target_above_100() {
-        let roll = DiceRoll {
-            target: 150,
-            modifier: DiceRollModifier::Normal,
-        };
-
         //Roll 30, succeeding extremely.
         let mut roller = SequentialDieRoller::new(vec![0, 3]);
-        let rolled = roll_regular_dice(&roll, &mut roller);
+        let rolled = roll_regular_dice(&DiceRollModifier::Normal, 150, &mut roller);
         assert_eq!(RollResult::ExtremeSuccess, rolled.result());
     }
 
     #[test]
     fn regular_roll_critical_success_on_one() {
-        let roll = DiceRoll {
-            target: 50,
-            modifier: DiceRollModifier::Normal,
-        };
-
         //Roll 1.
         let mut roller = SequentialDieRoller::new(vec![1, 0]);
-        let rolled = roll_regular_dice(&roll, &mut roller);
+        let rolled = roll_regular_dice(&DiceRollModifier::Normal, 50, &mut roller);
         assert_eq!(RollResult::CriticalSuccess, rolled.result());
     }
 
     #[test]
     fn regular_roll_fail_when_above_target() {
-        let roll = DiceRoll {
-            target: 50,
-            modifier: DiceRollModifier::Normal,
-        };
-
         //Roll 60.
         let mut roller = SequentialDieRoller::new(vec![0, 6]);
-        let rolled = roll_regular_dice(&roll, &mut roller);
+        let rolled = roll_regular_dice(&DiceRollModifier::Normal, 50, &mut roller);
         assert_eq!(RollResult::Failure, rolled.result());
     }
 
     #[test]
     fn regular_roll_is_fumble_when_skill_below_50_and_roll_at_least_96() {
-        let roll = DiceRoll {
-            target: 49,
-            modifier: DiceRollModifier::Normal,
-        };
-
         //Roll 96.
         let mut roller = SequentialDieRoller::new(vec![6, 9]);
-        let rolled = roll_regular_dice(&roll, &mut roller);
+        let rolled = roll_regular_dice(&DiceRollModifier::Normal, 49, &mut roller);
         assert_eq!(RollResult::Fumble, rolled.result());
     }
 
     #[test]
     fn regular_roll_is_failure_when_skill_at_or_above_50_and_roll_at_least_96() {
-        let roll = DiceRoll {
-            target: 50,
-            modifier: DiceRollModifier::Normal,
-        };
-
         //Roll 96.
         let mut roller = SequentialDieRoller::new(vec![6, 9]);
-        let rolled = roll_regular_dice(&roll, &mut roller);
+        let rolled = roll_regular_dice(&DiceRollModifier::Normal, 50, &mut roller);
         assert_eq!(RollResult::Failure, rolled.result());
 
-        let roll = DiceRoll {
-            target: 68,
-            modifier: DiceRollModifier::Normal,
-        };
-
         //Roll 96.
         let mut roller = SequentialDieRoller::new(vec![6, 9]);
-        let rolled = roll_regular_dice(&roll, &mut roller);
+        let rolled = roll_regular_dice(&DiceRollModifier::Normal, 68, &mut roller);
         assert_eq!(RollResult::Failure, rolled.result());
     }
 
     #[test]
     fn regular_roll_always_fumble_on_100() {
-        let roll = DiceRoll {
-            target: 100,
-            modifier: DiceRollModifier::Normal,
-        };
-
         //Roll 100.
         let mut roller = SequentialDieRoller::new(vec![0, 0]);
-        let rolled = roll_regular_dice(&roll, &mut roller);
+        let rolled = roll_regular_dice(&DiceRollModifier::Normal, 100, &mut roller);
         assert_eq!(RollResult::Fumble, rolled.result());
     }
 
     #[test]
     fn one_penalty_picks_highest_of_two() {
-        let roll = DiceRoll {
-            target: 50,
-            modifier: DiceRollModifier::OnePenalty,
-        };
-
         //Should only roll 30 and 40, not 50.
         let mut roller = SequentialDieRoller::new(vec![0, 3, 4, 5]);
-        let rolled = roll_regular_dice(&roll, &mut roller);
+        let rolled = roll_regular_dice(&DiceRollModifier::OnePenalty, 50, &mut roller);
         assert_eq!(40, rolled.num_rolled);
     }
 
     #[test]
     fn two_penalty_picks_highest_of_three() {
-        let roll = DiceRoll {
-            target: 50,
-            modifier: DiceRollModifier::TwoPenalty,
-        };
-
         //Should only roll 30, 40, 50, and not 60.
         let mut roller = SequentialDieRoller::new(vec![0, 3, 4, 5, 6]);
-        let rolled = roll_regular_dice(&roll, &mut roller);
+        let rolled = roll_regular_dice(&DiceRollModifier::TwoPenalty, 50, &mut roller);
         assert_eq!(50, rolled.num_rolled);
     }
 
     #[test]
     fn one_bonus_picks_lowest_of_two() {
-        let roll = DiceRoll {
-            target: 50,
-            modifier: DiceRollModifier::OneBonus,
-        };
-
         //Should only roll 30 and 40, not 20.
         let mut roller = SequentialDieRoller::new(vec![0, 3, 4, 2]);
-        let rolled = roll_regular_dice(&roll, &mut roller);
+        let rolled = roll_regular_dice(&DiceRollModifier::OneBonus, 50, &mut roller);
         assert_eq!(30, rolled.num_rolled);
     }
 
     #[test]
     fn two_bonus_picks_lowest_of_three() {
-        let roll = DiceRoll {
-            target: 50,
-            modifier: DiceRollModifier::TwoBonus,
-        };
-
         //Should only roll 30, 40, 50, and not 20.
         let mut roller = SequentialDieRoller::new(vec![0, 3, 4, 5, 2]);
-        let rolled = roll_regular_dice(&roll, &mut roller);
+        let rolled = roll_regular_dice(&DiceRollModifier::TwoBonus, 50, &mut roller);
         assert_eq!(30, rolled.num_rolled);
     }
 
     #[test]
     fn normal_modifier_rolls_once() {
-        let roll = DiceRoll {
-            target: 50,
-            modifier: DiceRollModifier::Normal,
-        };
-
         //Should only roll 30, not 40.
         let mut roller = SequentialDieRoller::new(vec![0, 3, 4]);
-        let rolled = roll_regular_dice(&roll, &mut roller);
+        let rolled = roll_regular_dice(&DiceRollModifier::Normal, 50, &mut roller);
         assert_eq!(30, rolled.num_rolled);
     }
 
     #[test]
     fn advancement_succeeds_on_above_skill() {
-        let roll = AdvancementRoll { existing_skill: 30 };
-
         //Roll 52, then advance skill by 5. (advancement adds +1 to 0-9 roll)
         let mut roller = SequentialDieRoller::new(vec![2, 5, 4]);
-        let rolled = roll_advancement_dice(&roll, &mut roller);
+
+        let rolled = roll_advancement_dice(30, &mut roller);
         assert!(rolled.successful());
         assert_eq!(5, rolled.advancement());
         assert_eq!(35, rolled.new_skill_amount());
@@ -545,11 +754,10 @@ mod tests {
 
     #[test]
     fn advancement_succeeds_on_above_95() {
-        let roll = AdvancementRoll { existing_skill: 97 };
-
         //Roll 96, then advance skill by 1. (advancement adds +1 to 0-9 roll)
         let mut roller = SequentialDieRoller::new(vec![6, 9, 0]);
-        let rolled = roll_advancement_dice(&roll, &mut roller);
+
+        let rolled = roll_advancement_dice(97, &mut roller);
         assert!(rolled.successful());
         assert_eq!(1, rolled.advancement());
         assert_eq!(98, rolled.new_skill_amount());
@@ -557,11 +765,10 @@ mod tests {
 
     #[test]
     fn advancement_fails_on_below_skill() {
-        let roll = AdvancementRoll { existing_skill: 30 };
-
         //Roll 25, failing.
         let mut roller = SequentialDieRoller::new(vec![5, 2]);
-        let rolled = roll_advancement_dice(&roll, &mut roller);
+
+        let rolled = roll_advancement_dice(30, &mut roller);
         assert!(!rolled.successful());
         assert_eq!(0, rolled.advancement());
     }

dicebot/src/cthulhu/parser.rs

@@ -0,0 +1,242 @@
+use super::dice::{AdvancementRoll, DiceRoll, DiceRollModifier};
+use crate::parser::dice::DiceParsingError;
+
+//TOOD convert these to use parse_amounts from the common dice code.
+
+fn parse_modifier(input: &str) -> Result<DiceRollModifier, DiceParsingError> {
+    match input.trim() {
+        "bb" => Ok(DiceRollModifier::TwoBonus),
+        "b" => Ok(DiceRollModifier::OneBonus),
+        "pp" => Ok(DiceRollModifier::TwoPenalty),
+        "p" => Ok(DiceRollModifier::OnePenalty),
+        "" => Ok(DiceRollModifier::Normal),
+        _ => Err(DiceParsingError::InvalidModifiers),
+    }
+}
+
+//Make diceroll take a vec of Amounts
+//Split based on :, send first part to parse_modifier.
+//Send second part to parse_amounts
+pub fn parse_regular_roll(input: &str) -> Result<DiceRoll, DiceParsingError> {
+    let (amount, modifiers_str) = crate::parser::dice::parse_single_amount(input)?;
+    let modifier = parse_modifier(modifiers_str)?;
+    Ok(DiceRoll { modifier, amount })
+}
+
+pub fn parse_advancement_roll(input: &str) -> Result<AdvancementRoll, DiceParsingError> {
+    let input = input.trim();
+    let (amounts, unconsumed_input) = crate::parser::dice::parse_single_amount(input)?;
+
+    if unconsumed_input.len() == 0 {
+        Ok(AdvancementRoll {
+            existing_skill: amounts,
+        })
+    } else {
+        Err(DiceParsingError::InvalidAmount)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::parser::dice::{Amount, DiceParsingError, Element, Operator};
+
+    #[test]
+    fn parse_modifier_rejects_bad_value() {
+        let modifier = parse_modifier("qqq");
+        assert!(matches!(modifier, Err(DiceParsingError::InvalidModifiers)))
+    }
+
+    #[test]
+    fn parse_modifier_accepts_one_bonus() {
+        let modifier = parse_modifier("b");
+        assert!(matches!(modifier, Ok(DiceRollModifier::OneBonus)))
+    }
+
+    #[test]
+    fn parse_modifier_accepts_two_bonus() {
+        let modifier = parse_modifier("bb");
+        assert!(matches!(modifier, Ok(DiceRollModifier::TwoBonus)))
+    }
+
+    #[test]
+    fn parse_modifier_accepts_two_penalty() {
+        let modifier = parse_modifier("pp");
+        assert!(matches!(modifier, Ok(DiceRollModifier::TwoPenalty)))
+    }
+
+    #[test]
+    fn parse_modifier_accepts_one_penalty() {
+        let modifier = parse_modifier("p");
+        assert!(matches!(modifier, Ok(DiceRollModifier::OnePenalty)))
+    }
+
+    #[test]
+    fn parse_modifier_accepts_normal() {
+        let modifier = parse_modifier("");
+        assert!(matches!(modifier, Ok(DiceRollModifier::Normal)))
+    }
+
+    #[test]
+    fn parse_modifier_accepts_normal_unaffected_by_whitespace() {
+        let modifier = parse_modifier("         ");
+        assert!(matches!(modifier, Ok(DiceRollModifier::Normal)))
+    }
+
+    #[test]
+    fn regular_roll_accepts_single_number() {
+        let result = parse_regular_roll("60");
+        assert!(result.is_ok());
+        assert_eq!(
+            DiceRoll {
+                amount: Amount {
+                    operator: Operator::Plus,
+                    element: Element::Number(60)
+                },
+                modifier: DiceRollModifier::Normal
+            },
+            result.unwrap()
+        );
+    }
+
+    #[test]
+    fn regular_roll_rejects_complex_expressions() {
+        let result = parse_regular_roll("3 + abc + bob - 4");
+        assert!(result.is_err());
+    }
+
+    #[test]
+    fn regular_roll_accepts_two_bonus() {
+        let result = parse_regular_roll("60 bb");
+        assert!(result.is_ok());
+        assert_eq!(
+            DiceRoll {
+                amount: Amount {
+                    operator: Operator::Plus,
+                    element: Element::Number(60)
+                },
+                modifier: DiceRollModifier::TwoBonus
+            },
+            result.unwrap()
+        );
+    }
+
+    #[test]
+    fn regular_roll_accepts_one_bonus() {
+        let result = parse_regular_roll("60 b");
+        assert!(result.is_ok());
+        assert_eq!(
+            DiceRoll {
+                amount: Amount {
+                    operator: Operator::Plus,
+                    element: Element::Number(60)
+                },
+                modifier: DiceRollModifier::OneBonus
+            },
+            result.unwrap()
+        );
+    }
+
+    #[test]
+    fn regular_roll_accepts_two_penalty() {
+        let result = parse_regular_roll("60 pp");
+        assert!(result.is_ok());
+        assert_eq!(
+            DiceRoll {
+                amount: Amount {
+                    operator: Operator::Plus,
+                    element: Element::Number(60)
+                },
+                modifier: DiceRollModifier::TwoPenalty
+            },
+            result.unwrap()
+        );
+    }
+
+    #[test]
+    fn regular_roll_accepts_one_penalty() {
+        let result = parse_regular_roll("60 p");
+        assert!(result.is_ok());
+        assert_eq!(
+            DiceRoll {
+                amount: Amount {
+                    operator: Operator::Plus,
+                    element: Element::Number(60)
+                },
+                modifier: DiceRollModifier::OnePenalty
+            },
+            result.unwrap()
+        );
+    }
+
+    #[test]
+    fn regular_roll_accepts_whitespace() {
+        assert!(parse_regular_roll("60     ").is_ok());
+        assert!(parse_regular_roll("   60").is_ok());
+        assert!(parse_regular_roll("   60    ").is_ok());
+
+        assert!(parse_regular_roll("60bb     ").is_ok());
+        assert!(parse_regular_roll("   60 bb").is_ok());
+        assert!(parse_regular_roll("   60   bb    ").is_ok());
+
+        assert!(parse_regular_roll("60b     ").is_ok());
+        assert!(parse_regular_roll("   60 b").is_ok());
+        assert!(parse_regular_roll("   60  b    ").is_ok());
+
+        assert!(parse_regular_roll("60pp     ").is_ok());
+        assert!(parse_regular_roll("   60 pp").is_ok());
+        assert!(parse_regular_roll("   60 pp   ").is_ok());
+
+        assert!(parse_regular_roll("60p     ").is_ok());
+        assert!(parse_regular_roll("   60p  ").is_ok());
+        assert!(parse_regular_roll("   60  p    ").is_ok());
+    }
+
+    #[test]
+    fn advancement_roll_accepts_whitespacen() {
+        assert!(parse_advancement_roll("60     ").is_ok());
+        assert!(parse_advancement_roll("   60").is_ok());
+        assert!(parse_advancement_roll("   60    ").is_ok());
+    }
+
+    #[test]
+    fn advancement_roll_accepts_single_number() {
+        let result = parse_advancement_roll("60");
+        assert!(result.is_ok());
+        assert_eq!(
+            AdvancementRoll {
+                existing_skill: Amount {
+                    operator: Operator::Plus,
+                    element: Element::Number(60)
+                }
+            },
+            result.unwrap()
+        );
+    }
+
+    #[test]
+    fn advancement_roll_allows_big_numbers() {
+        assert!(parse_advancement_roll("3000").is_ok());
+    }
+
+    #[test]
+    fn advancement_roll_allows_variables() {
+        let result = parse_advancement_roll("abc");
+        assert!(result.is_ok());
+        assert_eq!(
+            AdvancementRoll {
+                existing_skill: Amount {
+                    operator: Operator::Plus,
+                    element: Element::Variable(String::from("abc"))
+                }
+            },
+            result.unwrap()
+        );
+    }
+
+    #[test]
+    fn advancement_roll_rejects_complex_expressions() {
+        let result = parse_advancement_roll("3 + abc + bob - 4");
+        assert!(result.is_err());
+    }
+}

dicebot/src/db/errors.rs

@@ -0,0 +1,32 @@
+use std::num::TryFromIntError;
+use thiserror::Error;
+
+#[derive(Error, Debug)]
+pub enum DataError {
+    #[error("value does not exist for key: {0}")]
+    KeyDoesNotExist(String),
+
+    #[error("too many entries")]
+    TooManyEntries,
+
+    #[error("expected i32, but i32 schema was violated")]
+    I32SchemaViolation,
+
+    #[error("unexpected or corruptd data bytes")]
+    InvalidValue,
+
+    #[error("expected string ref, but utf8 schema was violated: {0}")]
+    Utf8RefSchemaViolation(#[from] std::str::Utf8Error),
+
+    #[error("expected string, but utf8 schema was violated: {0}")]
+    Utf8SchemaViolation(#[from] std::string::FromUtf8Error),
+
+    #[error("data migration error: {0}")]
+    MigrationError(#[from] crate::db::sqlite::migrator::MigrationError),
+
+    #[error("internal database error: {0}")]
+    SqlxError(#[from] sqlx::Error),
+
+    #[error("numeric conversion error")]
+    NumericConversionError(#[from] TryFromIntError),
+}

dicebot/src/db/mod.rs

@@ -0,0 +1,70 @@
+use crate::error::BotError;
+use crate::models::User;
+use async_trait::async_trait;
+use errors::DataError;
+use std::collections::HashMap;
+
+pub mod errors;
+pub mod sqlite;
+
+#[async_trait]
+pub(crate) trait DbState {
+    async fn get_device_id(&self) -> Result<Option<String>, DataError>;
+
+    async fn set_device_id(&self, device_id: &str) -> Result<(), DataError>;
+}
+
+#[async_trait]
+pub(crate) trait Users {
+    async fn upsert_user(&self, user: &User) -> Result<(), DataError>;
+
+    async fn get_user(&self, username: &str) -> Result<Option<User>, DataError>;
+
+    async fn delete_user(&self, username: &str) -> Result<(), DataError>;
+
+    async fn authenticate_user(
+        &self,
+        username: &str,
+        raw_password: &str,
+    ) -> Result<Option<User>, BotError>;
+}
+
+#[async_trait]
+pub(crate) trait Rooms {
+    async fn should_process(&self, room_id: &str, event_id: &str) -> Result<bool, DataError>;
+}
+
+// TODO move this up to the top once we delete sled. Traits will be the
+// main API, then we can have different impls for different DBs.
+#[async_trait]
+pub trait Variables {
+    async fn get_user_variables(
+        &self,
+        user: &str,
+        room_id: &str,
+    ) -> Result<HashMap<String, i32>, DataError>;
+
+    async fn get_variable_count(&self, user: &str, room_id: &str) -> Result<i32, DataError>;
+
+    async fn get_user_variable(
+        &self,
+        user: &str,
+        room_id: &str,
+        variable_name: &str,
+    ) -> Result<i32, DataError>;
+
+    async fn set_user_variable(
+        &self,
+        user: &str,
+        room_id: &str,
+        variable_name: &str,
+        value: i32,
+    ) -> Result<(), DataError>;
+
+    async fn delete_user_variable(
+        &self,
+        user: &str,
+        room_id: &str,
+        variable_name: &str,
+    ) -> Result<(), DataError>;
+}

dicebot/src/db/sqlite/migrator/migrations/V10__add_game_system.rs

@@ -0,0 +1,22 @@
+use crate::systems::GameSystem;
+use barrel::backend::Sqlite;
+use barrel::{types, types::Type, Migration};
+use itertools::Itertools;
+use strum::IntoEnumIterator;
+
+fn primary_id() -> Type {
+    types::text().unique(true).primary(true).nullable(false)
+}
+
+pub fn migration() -> String {
+    let mut m = Migration::new();
+
+    //Normally we would add a CHECK clause here, but types::custom requires a 'static string.
+    //Which means we can't automagically generate one from the enum.
+    m.create_table("room_info", move |t| {
+        t.add_column("room_id", primary_id());
+        t.add_column("game_system", types::text().nullable(false));
+    });
+
+    m.make::<Sqlite>()
+}

dicebot/src/db/sqlite/migrator/migrations/V1__variables.rs

@@ -0,0 +1,15 @@
+use barrel::backend::Sqlite;
+use barrel::{types, Migration};
+
+pub fn migration() -> String {
+    let mut m = Migration::new();
+
+    m.create_table("user_variables", |t| {
+        t.add_column("room_id", types::text());
+        t.add_column("user_id", types::text());
+        t.add_column("key", types::text());
+        t.add_column("value", types::integer());
+    });
+
+    m.make::<Sqlite>()
+}

dicebot/src/db/sqlite/migrator/migrations/V2__room_info.rs

@@ -0,0 +1,18 @@
+use barrel::backend::Sqlite;
+use barrel::{types, types::Type, Migration};
+
+fn primary_uuid() -> Type {
+    types::text().unique(true).primary(true).nullable(false)
+}
+
+pub fn migration() -> String {
+    let mut m = Migration::new();
+
+    //Table for basic room information: room ID, room name
+    m.create_table("room_info", move |t| {
+        t.add_column("room_id", primary_uuid());
+        t.add_column("room_name", types::text());
+    });
+
+    m.make::<Sqlite>()
+}

dicebot/src/db/sqlite/migrator/migrations/V3__dbstate.rs

@@ -0,0 +1,13 @@
+use barrel::backend::Sqlite;
+use barrel::{types, Migration};
+
+pub fn migration() -> String {
+    let mut m = Migration::new();
+
+    //Basic state table with only device ID for now. Uses only one row.
+    m.create_table("bot_state", move |t| {
+        t.add_column("device_id", types::text());
+    });
+
+    m.make::<Sqlite>()
+}

dicebot/src/db/sqlite/migrator/migrations/V4__room_events.rs

@@ -0,0 +1,23 @@
+use barrel::backend::Sqlite;
+use barrel::{types, Migration};
+
+pub fn migration() -> String {
+    let mut m = Migration::new();
+
+    //Table of room ID, event ID, event timestamp
+    m.create_table("room_events", move |t| {
+        t.add_column("room_id", types::text().nullable(false));
+        t.add_column("event_id", types::text().nullable(false));
+        t.add_column("event_timestamp", types::integer());
+    });
+
+    let mut res = m.make::<Sqlite>();
+
+    //This is a hack that gives us a composite primary key.
+    if res.ends_with(");") {
+        res.pop();
+        res.pop();
+    }
+
+    format!("{}, PRIMARY KEY (room_id, event_id));", res)
+}

dicebot/src/db/sqlite/migrator/migrations/V5__room_users.rs

@@ -0,0 +1,22 @@
+use barrel::backend::Sqlite;
+use barrel::{types, Migration};
+
+pub fn migration() -> String {
+    let mut m = Migration::new();
+
+    //Table of users in rooms.
+    m.create_table("room_users", move |t| {
+        t.add_column("room_id", types::text());
+        t.add_column("username", types::text());
+    });
+
+    let mut res = m.make::<Sqlite>();
+
+    //This is a hack that gives us a composite primary key.
+    if res.ends_with(");") {
+        res.pop();
+        res.pop();
+    }
+
+    format!("{}, PRIMARY KEY (room_id, username));", res)
+}

dicebot/src/db/sqlite/migrator/migrations/V6__user_accounts.rs

@@ -0,0 +1,18 @@
+use barrel::backend::Sqlite;
+use barrel::{types, types::Type, Migration};
+
+fn primary_uuid() -> Type {
+    types::text().unique(true).primary(true).nullable(false)
+}
+
+pub fn migration() -> String {
+    let mut m = Migration::new();
+
+    //Table of room ID, event ID, event timestamp
+    m.create_table("accounts", move |t| {
+        t.add_column("user_id", primary_uuid());
+        t.add_column("password", types::text().nullable(false));
+    });
+
+    m.make::<Sqlite>()
+}

dicebot/src/db/sqlite/migrator/migrations/V7__no_more_room_state.rs

@@ -0,0 +1,10 @@
+use barrel::backend::Sqlite;
+use barrel::Migration;
+
+pub fn migration() -> String {
+    let mut m = Migration::new();
+
+    m.drop_table_if_exists("room_info");
+    m.drop_table_if_exists("room_users");
+    m.make::<Sqlite>()
+}

dicebot/src/db/sqlite/migrator/migrations/V8__user_state.rs

@@ -0,0 +1,18 @@
+use barrel::backend::Sqlite;
+use barrel::{types, types::Type, Migration};
+
+fn primary_uuid() -> Type {
+    types::text().unique(true).primary(true).nullable(false)
+}
+
+pub fn migration() -> String {
+    let mut m = Migration::new();
+
+    // Keep track of contextual user state.
+    m.create_table("user_state", move |t| {
+        t.add_column("user_id", primary_uuid());
+        t.add_column("active_room", types::text().nullable(true));
+    });
+
+    m.make::<Sqlite>()
+}

dicebot/src/db/sqlite/migrator/migrations/V9__nullable_password_and_account_status.rs

@@ -0,0 +1,17 @@
+pub fn migration() -> String {
+    // sqlite does really support alter column, and barrel does not
+    // implement the required workaround, so we do it ourselves!
+    r#"
+      CREATE TABLE IF NOT EXISTS "accounts2" (
+         "user_id" TEXT PRIMARY KEY NOT NULL UNIQUE,
+         "password" TEXT NULL,
+         "account_status" TEXT NOT NULL CHECK(
+             account_status IN ('not_registered', 'registered', 'awaiting_activation'
+         ))
+      );
+      INSERT INTO accounts2 select *, 'registered' FROM accounts;
+      DROP TABLE accounts;
+      ALTER TABLE accounts2 RENAME TO accounts;
+    "#
+    .to_string()
+}

dicebot/src/db/sqlite/migrator/migrations/mod.rs

@@ -0,0 +1 @@
+

dicebot/src/db/sqlite/migrator/mod.rs

@@ -0,0 +1,38 @@
+use log::info;
+use refinery::config::{Config, ConfigDbType};
+use sqlx::sqlite::SqliteConnectOptions;
+use sqlx::ConnectOptions;
+use std::str::FromStr;
+use thiserror::Error;
+
+//pub mod migrations;
+
+#[derive(Error, Debug)]
+pub enum MigrationError {
+    #[error("sqlite connection error: {0}")]
+    SqlxError(#[from] sqlx::Error),
+
+    #[error("refinery migration error: {0}")]
+    RefineryError(#[from] refinery::Error),
+}
+
+mod embedded {
+    use refinery::embed_migrations;
+    embed_migrations!("src/db/sqlite/migrator/migrations");
+}
+
+/// Run database migrations against the sqlite database.
+pub async fn migrate(db_path: &str) -> Result<(), MigrationError> {
+    //Create database if missing.
+    let conn = SqliteConnectOptions::from_str(&format!("sqlite://{}", db_path))?
+        .create_if_missing(true)
+        .connect()
+        .await?;
+
+    drop(conn);
+
+    let mut conn = Config::new(ConfigDbType::Sqlite).set_db_path(db_path);
+    info!("Running migrations");
+    embedded::migrations::runner().run(&mut conn)?;
+    Ok(())
+}

dicebot/src/db/sqlite/mod.rs

@@ -0,0 +1,51 @@
+use crate::db::errors::DataError;
+use sqlx::sqlite::{SqliteConnectOptions, SqlitePool, SqlitePoolOptions};
+use sqlx::ConnectOptions;
+use std::clone::Clone;
+use std::str::FromStr;
+
+pub mod migrator;
+pub mod rooms;
+pub mod state;
+pub mod users;
+pub mod variables;
+
+pub struct Database {
+    conn: SqlitePool,
+}
+
+impl Database {
+    fn new_db(conn: SqlitePool) -> Result<Database, DataError> {
+        let database = Database { conn: conn.clone() };
+        Ok(database)
+    }
+
+    pub async fn new(path: &str) -> Result<Database, DataError> {
+        //Create database if missing.
+        let conn = SqliteConnectOptions::from_str(path)?
+            .create_if_missing(true)
+            .connect()
+            .await?;
+
+        drop(conn);
+
+        //Migrate database.
+        migrator::migrate(&path).await?;
+
+        //Return actual conncetion pool.
+        let conn = SqlitePoolOptions::new()
+            .max_connections(5)
+            .connect(path)
+            .await?;
+
+        Self::new_db(conn)
+    }
+}
+
+impl Clone for Database {
+    fn clone(&self) -> Self {
+        Database {
+            conn: self.conn.clone(),
+        }
+    }
+}

dicebot/src/db/sqlite/rooms.rs

@@ -0,0 +1,93 @@
+use super::Database;
+use crate::db::{errors::DataError, Rooms};
+use async_trait::async_trait;
+use sqlx::SqlitePool;
+use std::time::{SystemTime, UNIX_EPOCH};
+
+async fn record_event(conn: &SqlitePool, room_id: &str, event_id: &str) -> Result<(), DataError> {
+    use std::convert::TryFrom;
+    let now: i64 = i64::try_from(
+        SystemTime::now()
+            .duration_since(UNIX_EPOCH)
+            .expect("Clock has gone backwards")
+            .as_secs(),
+    )?;
+
+    sqlx::query(
+        r#"INSERT INTO room_events
+                      (room_id, event_id, event_timestamp)
+                      VALUES (?, ?, ?)"#,
+    )
+    .bind(room_id)
+    .bind(event_id)
+    .bind(now)
+    .execute(conn)
+    .await?;
+
+    Ok(())
+}
+
+#[async_trait]
+impl Rooms for Database {
+    async fn should_process(&self, room_id: &str, event_id: &str) -> Result<bool, DataError> {
+        let row = sqlx::query!(
+            r#"SELECT event_id FROM room_events
+               WHERE room_id = ? AND event_id = ?"#,
+            room_id,
+            event_id
+        )
+        .fetch_optional(&self.conn)
+        .await?;
+
+        match row {
+            Some(_) => Ok(false),
+            None => {
+                record_event(&self.conn, room_id, event_id).await?;
+                Ok(true)
+            }
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::db::sqlite::Database;
+    use crate::db::Rooms;
+    use std::future::Future;
+
+    async fn with_db<Fut>(f: impl FnOnce(Database) -> Fut)
+    where
+        Fut: Future<Output = ()>,
+    {
+        let db_path = tempfile::NamedTempFile::new_in(".").unwrap();
+        crate::db::sqlite::migrator::migrate(db_path.path().to_str().unwrap())
+            .await
+            .unwrap();
+
+        let db = Database::new(db_path.path().to_str().unwrap())
+            .await
+            .unwrap();
+
+        f(db).await;
+    }
+
+    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
+    async fn should_process_test() {
+        with_db(|db| async move {
+            let first_check = db
+                .should_process("myroom", "myeventid")
+                .await
+                .expect("should_process failed in first insert");
+
+            assert_eq!(first_check, true);
+
+            let second_check = db
+                .should_process("myroom", "myeventid")
+                .await
+                .expect("should_process failed in first insert");
+
+            assert_eq!(second_check, false);
+        })
+        .await;
+    }
+}

dicebot/src/db/sqlite/state.rs

@@ -0,0 +1,100 @@
+use super::Database;
+use crate::db::{errors::DataError, DbState};
+use async_trait::async_trait;
+
+#[async_trait]
+impl DbState for Database {
+    async fn get_device_id(&self) -> Result<Option<String>, DataError> {
+        let state = sqlx::query!(r#"SELECT device_id FROM bot_state limit 1"#)
+            .fetch_optional(&self.conn)
+            .await?;
+
+        Ok(state.map(|s| s.device_id))
+    }
+
+    async fn set_device_id(&self, device_id: &str) -> Result<(), DataError> {
+        // This will have to be updated if we ever add another column
+        // to this table!
+        sqlx::query("DELETE FROM bot_state")
+            .execute(&self.conn)
+            .await
+            .ok();
+
+        sqlx::query(
+            r#"INSERT INTO bot_state
+                      (device_id)
+                      VALUES (?)"#,
+        )
+        .bind(device_id)
+        .execute(&self.conn)
+        .await?;
+
+        Ok(())
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::db::sqlite::Database;
+    use crate::db::DbState;
+    use std::future::Future;
+
+    async fn with_db<Fut>(f: impl FnOnce(Database) -> Fut)
+    where
+        Fut: Future<Output = ()>,
+    {
+        let db_path = tempfile::NamedTempFile::new_in(".").unwrap();
+        crate::db::sqlite::migrator::migrate(db_path.path().to_str().unwrap())
+            .await
+            .unwrap();
+
+        let db = Database::new(db_path.path().to_str().unwrap())
+            .await
+            .unwrap();
+
+        f(db).await;
+    }
+
+    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
+    async fn set_and_get_device_id() {
+        with_db(|db| async move {
+            db.set_device_id("device_id")
+                .await
+                .expect("Could not set device ID");
+
+            let device_id = db.get_device_id().await.expect("Could not get device ID");
+
+            assert!(device_id.is_some());
+            assert_eq!(device_id.unwrap(), "device_id");
+        })
+        .await;
+    }
+
+    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
+    async fn no_device_id_set_returns_none() {
+        with_db(|db| async move {
+            let device_id = db.get_device_id().await.expect("Could not get device ID");
+            assert!(device_id.is_none());
+        })
+        .await;
+    }
+
+    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
+    async fn can_update_device_id() {
+        with_db(|db| async move {
+            db.set_device_id("device_id")
+                .await
+                .expect("Could not set device ID");
+
+            db.set_device_id("device_id2")
+                .await
+                .expect("Could not set device ID");
+
+            let device_id = db.get_device_id().await.expect("Could not get device ID");
+
+            assert!(device_id.is_some());
+            assert_eq!(device_id.unwrap(), "device_id2");
+        })
+        .await;
+    }
+}

dicebot/src/db/sqlite/users.rs

@@ -0,0 +1,361 @@
+use super::Database;
+use crate::db::{errors::DataError, Users};
+use crate::error::BotError;
+use crate::models::User;
+use async_trait::async_trait;
+
+#[async_trait]
+impl Users for Database {
+    async fn upsert_user(&self, user: &User) -> Result<(), DataError> {
+        let mut tx = self.conn.begin().await?;
+
+        sqlx::query!(
+            r#"INSERT INTO accounts (user_id, password, account_status)
+               VALUES (?, ?, ?)
+               ON CONFLICT(user_id) DO
+               UPDATE SET password = ?, account_status = ?"#,
+            user.username,
+            user.password,
+            user.account_status,
+            user.password,
+            user.account_status
+        )
+        .execute(&mut tx)
+        .await?;
+
+        sqlx::query!(
+            r#"INSERT INTO user_state (user_id, active_room)
+               VALUES (?, ?)
+               ON CONFLICT(user_id) DO
+               UPDATE SET active_room = ?"#,
+            user.username,
+            user.active_room,
+            user.active_room
+        )
+        .execute(&mut tx)
+        .await?;
+
+        tx.commit().await?;
+        Ok(())
+    }
+
+    async fn delete_user(&self, username: &str) -> Result<(), DataError> {
+        let mut tx = self.conn.begin().await?;
+
+        sqlx::query!(r#"DELETE FROM accounts WHERE user_id = ?"#, username)
+            .execute(&mut tx)
+            .await?;
+
+        sqlx::query!(r#"DELETE FROM user_state WHERE user_id = ?"#, username)
+            .execute(&mut tx)
+            .await?;
+
+        tx.commit().await?;
+
+        Ok(())
+    }
+
+    async fn get_user(&self, username: &str) -> Result<Option<User>, DataError> {
+        // Should be query_as! macro, but the left join breaks it with a
+        // non existing error message.
+        let user_row: Option<User> = sqlx::query_as(
+            r#"SELECT
+               a.user_id as "username",
+               a.password,
+               s.active_room,
+               COALESCE(a.account_status, 'not_registered') as "account_status"
+               FROM accounts a
+               LEFT JOIN user_state s on a.user_id = s.user_id
+               WHERE a.user_id = ?"#,
+        )
+        .bind(username)
+        .fetch_optional(&self.conn)
+        .await?;
+
+        Ok(user_row)
+    }
+
+    async fn authenticate_user(
+        &self,
+        username: &str,
+        raw_password: &str,
+    ) -> Result<Option<User>, BotError> {
+        let user = self.get_user(username).await?;
+        Ok(user.filter(|u| u.verify_password(raw_password)))
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::db::sqlite::Database;
+    use crate::db::Users;
+    use crate::models::AccountStatus;
+    use std::future::Future;
+
+    async fn with_db<Fut>(f: impl FnOnce(Database) -> Fut)
+    where
+        Fut: Future<Output = ()>,
+    {
+        let db_path = tempfile::NamedTempFile::new_in(".").unwrap();
+        crate::db::sqlite::migrator::migrate(db_path.path().to_str().unwrap())
+            .await
+            .unwrap();
+
+        let db = Database::new(db_path.path().to_str().unwrap())
+            .await
+            .unwrap();
+
+        f(db).await;
+    }
+
+    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
+    async fn create_and_get_full_user_test() {
+        with_db(|db| async move {
+            let insert_result = db
+                .upsert_user(&User {
+                    username: "myuser".to_string(),
+                    password: Some("abc".to_string()),
+                    account_status: AccountStatus::Registered,
+                    active_room: Some("myroom".to_string()),
+                })
+                .await;
+
+            assert!(insert_result.is_ok());
+
+            let user = db
+                .get_user("myuser")
+                .await
+                .expect("User retrieval query failed");
+
+            assert!(user.is_some());
+            let user = user.unwrap();
+            assert_eq!(user.username, "myuser");
+            assert_eq!(user.password, Some("abc".to_string()));
+            assert_eq!(user.account_status, AccountStatus::Registered);
+            assert_eq!(user.active_room, Some("myroom".to_string()));
+        })
+        .await;
+    }
+
+    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
+    async fn can_get_user_with_no_state_record() {
+        with_db(|db| async move {
+            let insert_result = db
+                .upsert_user(&User {
+                    username: "myuser".to_string(),
+                    password: Some("abc".to_string()),
+                    account_status: AccountStatus::AwaitingActivation,
+                    active_room: Some("myroom".to_string()),
+                })
+                .await;
+
+            assert!(insert_result.is_ok());
+
+            sqlx::query("DELETE FROM user_state")
+                .execute(&db.conn)
+                .await
+                .expect("Could not delete from user_state table.");
+
+            let user = db
+                .get_user("myuser")
+                .await
+                .expect("User retrieval query failed");
+
+            assert!(user.is_some());
+            let user = user.unwrap();
+            assert_eq!(user.username, "myuser");
+            assert_eq!(user.password, Some("abc".to_string()));
+            assert_eq!(user.account_status, AccountStatus::AwaitingActivation);
+
+            //These should be default values because the state record is missing.
+            assert_eq!(user.active_room, None);
+        })
+        .await;
+    }
+
+    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
+    async fn can_insert_without_password() {
+        with_db(|db| async move {
+            let insert_result = db
+                .upsert_user(&User {
+                    username: "myuser".to_string(),
+                    password: None,
+                    ..Default::default()
+                })
+                .await;
+
+            assert!(insert_result.is_ok());
+
+            let user = db
+                .get_user("myuser")
+                .await
+                .expect("User retrieval query failed");
+
+            assert!(user.is_some());
+            let user = user.unwrap();
+            assert_eq!(user.username, "myuser");
+            assert_eq!(user.password, None);
+        })
+        .await;
+    }
+
+    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
+    async fn can_insert_without_active_room() {
+        with_db(|db| async move {
+            let insert_result = db
+                .upsert_user(&User {
+                    username: "myuser".to_string(),
+                    active_room: None,
+                    ..Default::default()
+                })
+                .await;
+
+            assert!(insert_result.is_ok());
+
+            let user = db
+                .get_user("myuser")
+                .await
+                .expect("User retrieval query failed");
+
+            assert!(user.is_some());
+            let user = user.unwrap();
+            assert_eq!(user.username, "myuser");
+            assert_eq!(user.active_room, None);
+        })
+        .await;
+    }
+
+    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
+    async fn can_update_user() {
+        with_db(|db| async move {
+            let insert_result1 = db
+                .upsert_user(&User {
+                    username: "myuser".to_string(),
+                    password: Some("abc".to_string()),
+                    ..Default::default()
+                })
+                .await;
+
+            assert!(insert_result1.is_ok());
+
+            let insert_result2 = db
+                .upsert_user(&User {
+                    username: "myuser".to_string(),
+                    password: Some("123".to_string()),
+                    active_room: Some("room".to_string()),
+                    account_status: AccountStatus::AwaitingActivation,
+                })
+                .await;
+
+            assert!(insert_result2.is_ok());
+
+            let user = db
+                .get_user("myuser")
+                .await
+                .expect("User retrieval query failed");
+
+            assert!(user.is_some());
+            let user = user.unwrap();
+            assert_eq!(user.username, "myuser");
+
+            //From second upsert
+            assert_eq!(user.password, Some("123".to_string()));
+            assert_eq!(user.active_room, Some("room".to_string()));
+            assert_eq!(user.account_status, AccountStatus::AwaitingActivation);
+        })
+        .await;
+    }
+
+    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
+    async fn can_delete_user() {
+        with_db(|db| async move {
+            let insert_result = db
+                .upsert_user(&User {
+                    username: "myuser".to_string(),
+                    password: Some("abc".to_string()),
+                    ..Default::default()
+                })
+                .await;
+
+            assert!(insert_result.is_ok());
+
+            db.delete_user("myuser")
+                .await
+                .expect("User deletion query failed");
+
+            let user = db
+                .get_user("myuser")
+                .await
+                .expect("User retrieval query failed");
+
+            assert!(user.is_none());
+        })
+        .await;
+    }
+
+    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
+    async fn username_not_in_db_returns_none() {
+        with_db(|db| async move {
+            let user = db
+                .get_user("does not exist")
+                .await
+                .expect("Get user query failure");
+
+            assert!(user.is_none());
+        })
+        .await;
+    }
+
+    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
+    async fn authenticate_user_is_some_with_valid_password() {
+        with_db(|db| async move {
+            let insert_result = db
+                .upsert_user(&User {
+                    username: "myuser".to_string(),
+                    password: Some(
+                        crate::logic::hash_password("abc").expect("password hash error!"),
+                    ),
+                    ..Default::default()
+                })
+                .await;
+
+            assert!(insert_result.is_ok());
+
+            let user = db
+                .authenticate_user("myuser", "abc")
+                .await
+                .expect("User retrieval query failed");
+
+            assert!(user.is_some());
+            let user = user.unwrap();
+            assert_eq!(user.username, "myuser");
+        })
+        .await;
+    }
+
+    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
+    async fn authenticate_user_is_none_with_wrong_password() {
+        with_db(|db| async move {
+            let insert_result = db
+                .upsert_user(&User {
+                    username: "myuser".to_string(),
+                    password: Some(
+                        crate::logic::hash_password("abc").expect("password hash error!"),
+                    ),
+                    ..Default::default()
+                })
+                .await;
+
+            assert!(insert_result.is_ok());
+
+            let user = db
+                .authenticate_user("myuser", "wrong-password")
+                .await
+                .expect("User retrieval query failed");
+
+            assert!(user.is_none());
+        })
+        .await;
+    }
+}

dicebot/src/db/sqlite/variables.rs

@@ -0,0 +1,257 @@
+use super::Database;
+use crate::db::{errors::DataError, Variables};
+use async_trait::async_trait;
+use std::collections::HashMap;
+
+#[async_trait]
+impl Variables for Database {
+    async fn get_user_variables(
+        &self,
+        user: &str,
+        room_id: &str,
+    ) -> Result<HashMap<String, i32>, DataError> {
+        let rows = sqlx::query!(
+            r#"SELECT key, value as "value: i32" FROM user_variables
+               WHERE room_id = ? AND user_id = ?"#,
+            room_id,
+            user
+        )
+        .fetch_all(&self.conn)
+        .await?;
+
+        Ok(rows.into_iter().map(|row| (row.key, row.value)).collect())
+    }
+
+    async fn get_variable_count(&self, user: &str, room_id: &str) -> Result<i32, DataError> {
+        let row = sqlx::query!(
+            r#"SELECT count(*) as "count: i32" FROM user_variables
+               WHERE room_id = ? and user_id = ?"#,
+            room_id,
+            user
+        )
+        .fetch_optional(&self.conn)
+        .await?;
+
+        Ok(row.map(|r| r.count).unwrap_or(0))
+    }
+
+    async fn get_user_variable(
+        &self,
+        user: &str,
+        room_id: &str,
+        variable_name: &str,
+    ) -> Result<i32, DataError> {
+        let row = sqlx::query!(
+            r#"SELECT value as "value: i32" FROM user_variables
+               WHERE user_id = ? AND room_id = ? AND key = ?"#,
+            user,
+            room_id,
+            variable_name
+        )
+        .fetch_optional(&self.conn)
+        .await?;
+
+        row.map(|r| r.value)
+            .ok_or_else(|| DataError::KeyDoesNotExist(variable_name.to_string()))
+    }
+
+    async fn set_user_variable(
+        &self,
+        user: &str,
+        room_id: &str,
+        variable_name: &str,
+        value: i32,
+    ) -> Result<(), DataError> {
+        sqlx::query(
+            "INSERT INTO user_variables
+                    (user_id, room_id, key, value)
+                    values (?, ?, ?, ?)",
+        )
+        .bind(user)
+        .bind(room_id)
+        .bind(variable_name)
+        .bind(value)
+        .execute(&self.conn)
+        .await?;
+
+        Ok(())
+    }
+
+    async fn delete_user_variable(
+        &self,
+        user: &str,
+        room_id: &str,
+        variable_name: &str,
+    ) -> Result<(), DataError> {
+        sqlx::query(
+            "DELETE FROM user_variables
+             WHERE user_id = ? AND room_id = ? AND key = ?",
+        )
+        .bind(user)
+        .bind(room_id)
+        .bind(variable_name)
+        .execute(&self.conn)
+        .await?;
+
+        Ok(())
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::db::sqlite::Database;
+    use crate::db::Variables;
+    use std::future::Future;
+
+    async fn with_db<Fut>(f: impl FnOnce(Database) -> Fut)
+    where
+        Fut: Future<Output = ()>,
+    {
+        let db_path = tempfile::NamedTempFile::new_in(".").unwrap();
+        crate::db::sqlite::migrator::migrate(db_path.path().to_str().unwrap())
+            .await
+            .unwrap();
+
+        let db = Database::new(db_path.path().to_str().unwrap())
+            .await
+            .unwrap();
+
+        f(db).await;
+    }
+
+    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
+    async fn set_and_get_variable_test() {
+        with_db(|db| async move {
+            db.set_user_variable("myuser", "myroom", "myvariable", 1)
+                .await
+                .expect("Could not set variable");
+
+            let value = db
+                .get_user_variable("myuser", "myroom", "myvariable")
+                .await
+                .expect("Could not get variable");
+
+            assert_eq!(value, 1);
+        })
+        .await;
+    }
+
+    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
+    async fn get_missing_variable_test() {
+        with_db(|db| async move {
+            let value = db.get_user_variable("myuser", "myroom", "myvariable").await;
+
+            assert!(value.is_err());
+            assert!(matches!(
+                value.err().unwrap(),
+                DataError::KeyDoesNotExist(_)
+            ));
+        })
+        .await;
+    }
+
+    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
+    async fn get_other_user_variable_test() {
+        with_db(|db| async move {
+            db.set_user_variable("myuser1", "myroom", "myvariable", 1)
+                .await
+                .expect("Could not set variable");
+
+            let value = db
+                .get_user_variable("myuser2", "myroom", "myvariable")
+                .await;
+
+            assert!(value.is_err());
+            assert!(matches!(
+                value.err().unwrap(),
+                DataError::KeyDoesNotExist(_)
+            ));
+        })
+        .await;
+    }
+
+    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
+    async fn count_variables_test() {
+        with_db(|db| async move {
+            for variable_name in &["var1", "var2", "var3"] {
+                db.set_user_variable("myuser", "myroom", variable_name, 1)
+                    .await
+                    .expect("Could not set variable");
+            }
+
+            let count = db
+                .get_variable_count("myuser", "myroom")
+                .await
+                .expect("Could not get count.");
+
+            assert_eq!(count, 3);
+        })
+        .await;
+    }
+
+    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
+    async fn count_variables_respects_user_id() {
+        with_db(|db| async move {
+            for variable_name in &["var1", "var2", "var3"] {
+                db.set_user_variable("different-user", "myroom", variable_name, 1)
+                    .await
+                    .expect("Could not set variable");
+            }
+
+            let count = db
+                .get_variable_count("myuser", "myroom")
+                .await
+                .expect("Could not get count.");
+
+            assert_eq!(count, 0);
+        })
+        .await;
+    }
+
+    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
+    async fn count_variables_respects_room_id() {
+        with_db(|db| async move {
+            for variable_name in &["var1", "var2", "var3"] {
+                db.set_user_variable("myuser", "different-room", variable_name, 1)
+                    .await
+                    .expect("Could not set variable");
+            }
+
+            let count = db
+                .get_variable_count("myuser", "myroom")
+                .await
+                .expect("Could not get count.");
+
+            assert_eq!(count, 0);
+        })
+        .await;
+    }
+
+    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
+    async fn delete_variable_test() {
+        with_db(|db| async move {
+            for variable_name in &["var1", "var2", "var3"] {
+                db.set_user_variable("myuser", "myroom", variable_name, 1)
+                    .await
+                    .expect("Could not set variable");
+            }
+
+            db.delete_user_variable("myuser", "myroom", "var1")
+                .await
+                .expect("Could not delete variable.");
+
+            let count = db
+                .get_variable_count("myuser", "myroom")
+                .await
+                .expect("Could not get count");
+
+            assert_eq!(count, 2);
+
+            let var1 = db.get_user_variable("myuser", "myroom", "var1").await;
+            assert!(var1.is_err());
+            assert!(matches!(var1.err().unwrap(), DataError::KeyDoesNotExist(_)));
+        })
+        .await;
+    }
+}

dicebot/src/error.rs

@@ -0,0 +1,126 @@
+use std::net::AddrParseError;
+
+use crate::commands::CommandError;
+use crate::config::ConfigError;
+use crate::db::errors::DataError;
+use thiserror::Error;
+use tonic::metadata::errors::InvalidMetadataValue;
+
+#[derive(Error, Debug)]
+pub enum BotError {
+    #[error("configuration error: {0}")]
+    ConfigurationError(#[from] ConfigError),
+
+    /// Sync token couldn't be found.
+    #[error("the sync token could not be retrieved")]
+    SyncTokenRequired,
+
+    #[error("could not retrieve device id")]
+    NoDeviceIdFound,
+
+    #[error("could not build client: {0}")]
+    ClientBuildError(#[from] matrix_sdk::ClientBuildError),
+
+    #[error("could not open matrix store: {0}")]
+    OpenStoreError(#[from] matrix_sdk::store::OpenStoreError),
+
+    #[error("command error: {0}")]
+    CommandError(#[from] CommandError),
+
+    #[error("database error: {0}")]
+    DataError(#[from] DataError),
+
+    #[error("the message should not be processed because it failed validation")]
+    ShouldNotProcessError,
+
+    #[error("no cache directory found")]
+    NoCacheDirectoryError,
+
+    #[error("could not parse URL")]
+    UrlParseError(#[from] url::ParseError),
+
+    #[error("could not parse ID")]
+    IdParseError(#[from] matrix_sdk::ruma::IdParseError),
+
+    #[error("error in matrix state store: {0}")]
+    MatrixStateStoreError(#[from] matrix_sdk::StoreError),
+
+    #[error("uncategorized matrix SDK error: {0}")]
+    MatrixError(#[from] matrix_sdk::Error),
+
+    #[error("future canceled")]
+    FutureCanceledError,
+
+    //de = deserialization
+    #[error("toml parsing error")]
+    TomlParsingError(#[from] toml::de::Error),
+
+    #[error("i/o error: {0}")]
+    IoError(#[from] std::io::Error),
+
+    #[error("dice parsing error: {0}")]
+    DiceParsingError(#[from] crate::parser::dice::DiceParsingError),
+
+    #[error("command parsing error: {0}")]
+    CommandParsingError(#[from] crate::commands::parser::CommandParsingError),
+
+    #[error("dice rolling error: {0}")]
+    DiceRollingError(#[from] DiceRollingError),
+
+    #[error("variable parsing error: {0}")]
+    VariableParsingError(#[from] crate::parser::variables::VariableParsingError),
+
+    #[error("legacy parsing error")]
+    NomParserError(nom::error::ErrorKind),
+
+    #[error("legacy parsing error: not enough data")]
+    NomParserIncomplete,
+
+    #[error("variables not yet supported")]
+    VariablesNotSupported,
+
+    #[error("too many commands or message was too large")]
+    MessageTooLarge,
+
+    #[error("could not convert to proper integer type")]
+    TryFromIntError(#[from] std::num::TryFromIntError),
+
+    // #[error("identifier error: {0}")]
+    // IdentifierError(#[from] matrix_sdk::ruma::Error),
+
+    #[error("password creation error: {0}")]
+    PasswordCreationError(argon2::Error),
+
+    #[error("account does not exist, or password incorrect")]
+    AuthenticationError,
+
+    #[error("user account does not exist, try registering")]
+    AccountDoesNotExist,
+
+    #[error("user account already exists")]
+    AccountAlreadyExists,
+
+    #[error("room name or id does not exist")]
+    RoomDoesNotExist,
+
+    #[error("tonic transport error: {0}")]
+    TonicTransportError(#[from] tonic::transport::Error),
+
+    #[error("address parsing error: {0}")]
+    AddressParseError(#[from] AddrParseError),
+
+    #[error("invalid metadata value: {0}")]
+    TonicInvalidMetadata(#[from] InvalidMetadataValue),
+}
+
+#[derive(Error, Debug)]
+pub enum DiceRollingError {
+    #[error("variable not found: {0}")]
+    VariableNotFound(String),
+
+    #[error("invalid amount")]
+    InvalidAmount,
+
+    #[error("dice pool expression too large")]
+    ExpressionTooLarge,
+}

dicebot/src/help.rs

@@ -0,0 +1,156 @@
+use indoc::indoc;
+
+pub fn parse_help_topic(input: &str) -> Option<HelpTopic> {
+    match input {
+        "cofd" => Some(HelpTopic::ChroniclesOfDarkness),
+        "dicepool" => Some(HelpTopic::DicePool),
+        "dice" => Some(HelpTopic::RollingDice),
+        "cthulhu" => Some(HelpTopic::Cthulhu),
+        "variables" => Some(HelpTopic::Variables),
+        "var" => Some(HelpTopic::Variables),
+        "variable" => Some(HelpTopic::Variables),
+        "" => Some(HelpTopic::General),
+        _ => None,
+    }
+}
+
+pub enum HelpTopic {
+    ChroniclesOfDarkness,
+    DicePool,
+    Cthulhu,
+    RollingDice,
+    Variables,
+    General,
+}
+
+const COFD_HELP: &'static str = indoc! {"
+Chronicles of Darkness
+
+Commands available:
+ !pool, !rp: roll a dice pool
+ !chance: roll a chance die
+
+See also:
+ !help dicepool
+"};
+
+const DICE_HELP: &'static str = indoc! {"
+Rolling basic dice
+
+Command: !roll, !r
+
+Syntax !roll <dice-expression>
+
+Dice expression can be a basic die (e.g. 1d4), with a bonus (1d4+3),
+or a more complex series of dice rolls or arbitrary numbers.
+Parentheses are not supported.
+
+Examples:
+ !roll 1d4
+ !roll 1d4+5
+ !roll 2d6+8
+ !roll 2d8 + 4d6 - 3
+"};
+
+const DICEPOOL_HELP: &'static str = indoc! {"
+Rolling dice pools
+
+Command: !pool, !rp
+
+Syntax: !pool <modifiers>:<expression>
+
+Short syntax: !pool <expression>
+
+Expression Syntax: <num|variable> [+/- <expression> ...]
+
+Modifiers:
+ n = nine-again
+ e = eight-again
+ r = rote quality
+ x = do not re-roll 10s
+ s<num> = number of successes for exceptional
+
+Examples:
+ !pool 8 (roll a regular pool of 8 dice)
+ !pool n:5 (roll dice pool of 5, nine-again)
+ !pool rs3:6 (roll dice pool of 6, rote quality, 3 successes for exceptional)
+ !pool 10 + 3 (roll dice pool of 10 + 3, which is 13)
+ !pool myskill - 4 (roll pool of the value of myskill - 4).
+ !pool n:myskill - 5 (roll pool of myskill - 5, with nine-again)
+"};
+
+const CTHULHU_HELP: &'static str = indoc! {"
+Rolling Call of Cthlhu dice
+
+Commands: !cthroll (regular rolls), !cthadv (advancement rolls)
+
+Regular roll syntax: !cthroll <modifiers>:<num|variable>
+
+Advancement roll syntax: !cthadv <num|variable>
+
+Modifiers:
+ b = one bonus die
+ bb = two bonus dice
+ p = one penalty die
+ pp = two penalty dice
+
+Examples:
+  !cthroll 60 (make a roll against a skill of 60)
+  !cthroll spothidden (make a roll against variable spothidden)
+  !cthroll bb:30 (make a roll against skill of 30 with two bonus dice)
+  !cthadv 50 (make an advancement roll against a skill of 50)
+  !cthadv spothidden (make an advancement roll against the number in spothidden)
+
+Note: If !cthadv is given a variable, and the roll is successful, it will
+update the variable with the new skill.
+"};
+
+const VARIABLES_HELP: &'static str = indoc! {"
+Variables
+
+Commands: !get, !set, !variables
+
+Manage variables that can be substituted into roll commands.
+
+Examples: !get myvar, !set myvar 10
+
+!get <variable> = show variable of the given name
+!set <variable> <num> = set a variable to a number
+
+The !variables command will list all variables for the room. The
+variables command cna be used in a secure room to avoid spamming the
+actual room that the variable is set in.
+
+Variable names can be used in all types of dice rolls:
+
+!pool myvar + 3
+!roll myvar
+
+There are some limitations on variables: they cannot themselves be
+dice expressions (i.e. can only be numbers), and they must be uniquely
+parseable in an expression (i.e 'myvard6' does not work for the !roll
+command).
+
+"};
+
+const GENERAL_HELP: &'static str = indoc! {"
+General Help
+
+Try these help commands:
+  !help cofd
+  !help dice
+  !help cthulhu
+"};
+
+impl HelpTopic {
+    pub fn message(&self) -> &str {
+        match self {
+            HelpTopic::ChroniclesOfDarkness => COFD_HELP,
+            HelpTopic::DicePool => DICEPOOL_HELP,
+            HelpTopic::Cthulhu => CTHULHU_HELP,
+            HelpTopic::RollingDice => DICE_HELP,
+            HelpTopic::Variables => VARIABLES_HELP,
+            HelpTopic::General => GENERAL_HELP,
+        }
+    }
+}

dicebot/src/lib.rs

@@ -1,3 +1,4 @@
+pub mod basic;
 pub mod bot;
 pub mod cofd;
 pub mod commands;
@@ -5,10 +6,12 @@ pub mod config;
 pub mod context;
 pub mod cthulhu;
 pub mod db;
-pub mod dice;
 pub mod error;
 mod help;
+pub mod logic;
+pub mod matrix;
+pub mod models;
 mod parser;
-pub mod roll;
+pub mod rpc;
 pub mod state;
-pub mod variables;
+pub mod systems;

dicebot/src/logic.rs

@@ -0,0 +1,131 @@
+use crate::error::{BotError, DiceRollingError};
+use crate::parser::dice::{Amount, Element};
+use crate::{context::Context, models::Account};
+use crate::{
+    db::{sqlite::Database, Users, Variables},
+    models::TransientUser,
+};
+use argon2::{self, Config, Error as ArgonError};
+use futures::stream::{self, StreamExt, TryStreamExt};
+use rand::Rng;
+use std::slice;
+
+/// Calculate the amount of dice to roll by consulting the database
+/// and replacing variables with corresponding the amount. Errors out
+/// if it cannot find a variable defined, or if the database errors.
+pub async fn calculate_single_die_amount(
+    amount: &Amount,
+    ctx: &Context<'_>,
+) -> Result<i32, BotError> {
+    calculate_dice_amount(slice::from_ref(amount), ctx).await
+}
+
+/// Calculate the amount of dice to roll by consulting the database
+/// and replacing variables with corresponding amounts. Errors out if
+/// it cannot find a variable defined, or if the database errors.
+pub async fn calculate_dice_amount(amounts: &[Amount], ctx: &Context<'_>) -> Result<i32, BotError> {
+    let stream = stream::iter(amounts);
+    let variables = &ctx
+        .db
+        .get_user_variables(&ctx.username, ctx.active_room_id().as_str())
+        .await?;
+
+    use DiceRollingError::VariableNotFound;
+    let dice_amount: i32 = stream
+        .then(|amount| async move {
+            match &amount.element {
+                Element::Number(num_dice) => Ok(num_dice * amount.operator.mult()),
+                Element::Variable(variable) => variables
+                    .get(variable)
+                    .ok_or_else(|| VariableNotFound(variable.clone()))
+                    .map(|i| *i),
+            }
+        })
+        .try_fold(0, |total, num_dice| async move { Ok(total + num_dice) })
+        .await?;
+
+    Ok(dice_amount)
+}
+
+/// Hash a password using the argon2 algorithm with a 16 byte salt.
+pub(crate) fn hash_password(raw_password: &str) -> Result<String, ArgonError> {
+    let salt = rand::thread_rng().gen::<[u8; 16]>();
+    let config = Config::default();
+    argon2::hash_encoded(raw_password.as_bytes(), &salt, &config)
+}
+
+pub(crate) async fn get_account(db: &Database, username: &str) -> Result<Account, BotError> {
+    Ok(db
+        .get_user(username)
+        .await?
+        .map(|user| Account::Registered(user))
+        .unwrap_or_else(|| {
+            Account::Transient(TransientUser {
+                username: username.to_owned(),
+            })
+        }))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::db::Users;
+    use crate::models::{AccountStatus, User};
+    use std::future::Future;
+
+    async fn with_db<Fut>(f: impl FnOnce(Database) -> Fut)
+    where
+        Fut: Future<Output = ()>,
+    {
+        let db_path = tempfile::NamedTempFile::new_in(".").unwrap();
+        crate::db::sqlite::migrator::migrate(db_path.path().to_str().unwrap())
+            .await
+            .unwrap();
+
+        let db = Database::new(db_path.path().to_str().unwrap())
+            .await
+            .unwrap();
+
+        f(db).await;
+    }
+
+    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
+    async fn get_account_no_user_exists() {
+        with_db(|db| async move {
+            let account = get_account(&db, "@test:example.com")
+                .await
+                .expect("Account retrieval didn't work");
+
+            assert!(matches!(account, Account::Transient(_)));
+
+            let user = account.transient_user().unwrap();
+            assert_eq!(user.username, "@test:example.com");
+        })
+        .await;
+    }
+
+    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
+    async fn get_or_create_user_when_user_exists() {
+        with_db(|db| async move {
+            let user = User {
+                username: "myuser".to_string(),
+                password: Some("abc".to_string()),
+                account_status: AccountStatus::Registered,
+                active_room: Some("myroom".to_string()),
+            };
+
+            let insert_result = db.upsert_user(&user).await;
+            assert!(insert_result.is_ok());
+
+            let account = get_account(&db, "myuser")
+                .await
+                .expect("Account retrieval did not work");
+
+            assert!(matches!(account, Account::Registered(_)));
+
+            let user_again = account.registered_user().unwrap();
+            assert_eq!(user, *user_again);
+        })
+        .await;
+    }
+}

dicebot/src/matrix.rs

@@ -0,0 +1,113 @@
+use std::path::PathBuf;
+
+use futures::stream::{self, StreamExt, TryStreamExt};
+use log::error;
+use matrix_sdk::ruma::events::room::message::{InReplyTo, RoomMessageEventContent, Relation};
+use matrix_sdk::ruma::events::AnyMessageLikeEventContent;
+use matrix_sdk::ruma::{RoomId, OwnedEventId, OwnedUserId};
+use matrix_sdk::Client;
+use matrix_sdk::Error as MatrixError;
+use matrix_sdk::room::Joined;
+use url::Url;
+
+use crate::{config::Config, error::BotError};
+
+fn cache_dir() -> Result<PathBuf, BotError> {
+    let mut dir = dirs::cache_dir().ok_or(BotError::NoCacheDirectoryError)?;
+    dir.push("matrix-dicebot");
+    Ok(dir)
+}
+
+/// Extracts more detailed error messages out of a matrix SDK error.
+fn extract_error_message(error: MatrixError) -> String {
+    use matrix_sdk::{Error::Http, HttpError};
+    if let Http(HttpError::Api(ruma_err)) = error {
+        ruma_err.to_string()
+    } else {
+        error.to_string()
+    }
+}
+
+/// Creates the matrix client.
+pub async fn create_client(config: &Config) -> Result<Client, BotError> {
+    let cache_dir = cache_dir()?;
+    let homeserver_url = Url::parse(&config.matrix_homeserver())?;
+
+    let client = Client::builder()
+        .sled_store(cache_dir, None)?
+        .homeserver_url(homeserver_url).build()
+        .await?;
+
+    Ok(client)
+}
+
+/// Retrieve a list of users in a given room.
+pub async fn get_users_in_room(
+    client: &Client,
+    room_id: &RoomId,
+) -> Result<Vec<String>, MatrixError> {
+    if let Some(joined_room) = client.get_joined_room(room_id) {
+        let members = joined_room.joined_members().await?;
+
+        Ok(members
+            .into_iter()
+            .map(|member| member.user_id().to_string())
+            .collect())
+    } else {
+        Ok(vec![])
+    }
+}
+
+pub async fn get_rooms_for_user(
+    client: &Client,
+    user: &OwnedUserId,
+) -> Result<Vec<Joined>, MatrixError> {
+    // Carries errors through, in case we cannot load joined user IDs
+    // from the room for some reason.
+    let user_is_in_room = |room: Joined| async move {
+        match room.joined_user_ids().await {
+            Ok(users) => match users.contains(user) {
+                true => Some(Ok(room)),
+                false => None,
+            },
+            Err(e) => Some(Err(e)),
+        }
+    };
+
+    let rooms_for_user: Vec<Joined> = stream::iter(client.joined_rooms())
+        .filter_map(user_is_in_room)
+        .try_collect()
+        .await?;
+
+    Ok(rooms_for_user)
+}
+
+/// Send a message. The message is a tuple of HTML and plain text
+/// responses.
+pub async fn send_message(
+    client: &Client,
+    room_id: &RoomId,
+    message: (&str, &str),
+    reply_to: Option<OwnedEventId>,
+) {
+    let (html, plain) = message;
+    let room = match client.get_joined_room(room_id) {
+        Some(room) => room,
+        _ => return,
+    };
+
+    let mut content = RoomMessageEventContent::notice_html(plain.trim(), html);
+
+    content.relates_to = reply_to.map(|event_id| Relation::Reply {
+        in_reply_to: InReplyTo::new(event_id)
+    });
+
+    let content = AnyMessageLikeEventContent::RoomMessage(content);
+
+    let result = room.send(content, None).await;
+
+    if let Err(e) = result {
+        let html = extract_error_message(e);
+        error!("Error sending html: {}", html);
+    };
+}

dicebot/src/models.rs

@@ -0,0 +1,157 @@
+use serde::{Deserialize, Serialize};
+
+/// RoomInfo has basic metadata about a room: its name, ID, etc.
+#[derive(Serialize, Deserialize, Clone, Debug, PartialEq)]
+pub struct RoomInfo {
+    pub room_id: String,
+    pub room_name: String,
+}
+
+#[derive(Eq, PartialEq, Clone, Copy, Debug, sqlx::Type)]
+#[sqlx(rename_all = "snake_case")]
+pub enum AccountStatus {
+    /// Account is not registered, which means a transient "account"
+    /// with limited information exists only for the duration of the
+    /// command request.
+    NotRegistered,
+
+    /// User account is fully registered, either via Matrix directly,
+    /// or a web UI sign-up.
+    Registered,
+
+    /// Account is awaiting activation with a registration
+    /// code. Account cannot do privileged actions yet.
+    AwaitingActivation,
+}
+
+impl Default for AccountStatus {
+    fn default() -> Self {
+        AccountStatus::NotRegistered
+    }
+}
+
+#[derive(Clone, Debug, Eq, PartialEq)]
+pub enum Account {
+    /// A registered user account, stored in the database.
+    Registered(User),
+
+    /// A transient account. Not stored in the database. Represents a
+    /// user in a public channel that has not registered directly with
+    /// the bot yet.
+    Transient(TransientUser),
+}
+
+impl Account {
+    /// Whether or not this account is a registered user account.
+    pub fn is_registered(&self) -> bool {
+        matches!(self, Self::Registered(_))
+    }
+
+    /// Gets the account status. For registered users, this is their
+    /// actual account status (fully registered or awaiting
+    /// activation). For transient users, this is
+    /// AccountStatus::NotRegistered.
+    pub fn account_status(&self) -> AccountStatus {
+        match self {
+            Self::Registered(user) => user.account_status,
+            Self::Transient(_) => AccountStatus::NotRegistered,
+        }
+    }
+
+    /// Consume self into an Option<User> instance, which will be Some
+    /// if this account has a registered user, and None otherwise.
+    pub fn registered_user(&self) -> Option<&User> {
+        match self {
+            Self::Registered(ref user) => Some(user),
+            _ => None,
+        }
+    }
+
+    /// Consume self into an Option<TransientUser> instance, which
+    /// will be Some if this account has a non-registered user, and
+    /// None otherwise.
+    pub fn transient_user(self) -> Option<TransientUser> {
+        match self {
+            Self::Transient(user) => Some(user),
+            _ => None,
+        }
+    }
+}
+
+impl Default for Account {
+    fn default() -> Self {
+        Account::Transient(TransientUser {
+            username: "".to_string(),
+        })
+    }
+}
+
+#[derive(Clone, Debug, Eq, PartialEq)]
+pub struct TransientUser {
+    pub username: String,
+}
+
+#[derive(Eq, PartialEq, Clone, Debug, Default, sqlx::FromRow)]
+pub struct User {
+    pub username: String,
+    pub password: Option<String>,
+    pub active_room: Option<String>,
+    pub account_status: AccountStatus,
+}
+
+impl User {
+    /// Create a new unregistered skeleton marker account for a
+    /// username.
+    pub fn unregistered(username: &str) -> User {
+        User {
+            username: username.to_owned(),
+            ..Default::default()
+        }
+    }
+
+    pub fn verify_password(&self, raw_password: &str) -> bool {
+        self.password
+            .as_ref()
+            .and_then(|p| argon2::verify_encoded(p, raw_password.as_bytes()).ok())
+            .unwrap_or(false)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn verify_password_passes_with_correct_password() {
+        let user = User {
+            password: Some(
+                crate::logic::hash_password("mypassword").expect("Password hashing error!"),
+            ),
+            ..Default::default()
+        };
+
+        assert_eq!(user.verify_password("mypassword"), true);
+    }
+
+    #[test]
+    fn verify_password_fails_with_wrong_password() {
+        let user = User {
+            password: Some(
+                crate::logic::hash_password("mypassword").expect("Password hashing error!"),
+            ),
+            ..Default::default()
+        };
+
+        assert_eq!(user.verify_password("wrong-password"), false);
+    }
+
+    #[test]
+    fn verify_password_fails_with_no_password() {
+        let user = User {
+            password: None,
+            ..Default::default()
+        };
+
+        assert_eq!(user.verify_password("wrong-password"), false);
+    }
+}

dicebot/src/parser/dice.rs

@@ -0,0 +1,318 @@
+use combine::error::ParseError;
+use combine::parser::char::{digit, letter, spaces};
+use combine::stream::Stream;
+use combine::{many, many1, one_of, Parser};
+use thiserror::Error;
+
+/// Errors for dice parsing.
+#[derive(Debug, Clone, PartialEq, Copy, Error)]
+pub enum DiceParsingError {
+    #[error("invalid amount")]
+    InvalidAmount,
+
+    #[error("modifiers not specified properly")]
+    InvalidModifiers,
+
+    #[error("extraneous input detected")]
+    UnconsumedInput,
+
+    #[error("{0}")]
+    InternalParseError(#[from] combine::error::StringStreamError),
+
+    #[error("number parsing error (too large?)")]
+    ConversionError,
+
+    #[error("unexpected element in expression")]
+    WrongElementType,
+}
+
+impl From<std::num::ParseIntError> for DiceParsingError {
+    fn from(_: std::num::ParseIntError) -> Self {
+        DiceParsingError::ConversionError
+    }
+}
+
+type ParseResult<T> = Result<T, DiceParsingError>;
+
+/// A parsed operator for a number. Whether to add or remove it from
+/// the total amount of dice rolled.
+#[derive(Debug, PartialEq, Eq, Clone, Copy)]
+pub enum Operator {
+    Plus,
+    Minus,
+}
+
+impl Operator {
+    /// Calculate multiplier for how to convert the number. Returns 1
+    /// for positive, and -1 for negative.
+    pub fn mult(&self) -> i32 {
+        match self {
+            Operator::Plus => 1,
+            Operator::Minus => -1,
+        }
+    }
+}
+
+/// One part of the dice amount in an expression. Can be a number or a
+/// variable name.
+#[derive(Debug, PartialEq, Eq, Clone)]
+pub enum Element {
+    /// This element in the expression is a variable, which will be
+    /// resolved to a number by consulting the dtaabase.
+    Variable(String),
+
+    /// This element is a simple number, and will be added or
+    /// subtracted from the total dice amount depending on its
+    /// corresponding Operator.
+    Number(i32),
+}
+
+/// One part of the parsed dice rolling expression. Combines an
+/// operator and an element into one struct. Examples of Amounts would
+/// be "+4" or "- myvariable", which translate to Operator::Plus and
+/// Element::Number(4), and Operator::Minus and
+/// Element::Variable("myvariable"), respectively.
+#[derive(Debug, PartialEq, Eq, Clone)]
+pub struct Amount {
+    pub operator: Operator,
+    pub element: Element,
+}
+
+/// Parser that attempt to convert the text at the start of the dice
+/// parsing into an Amount instance.
+fn first_amount_parser<Input>() -> impl Parser<Input, Output = ParseResult<Amount>>
+where
+    Input: Stream<Token = char>,
+    Input::Error: ParseError<Input::Token, Input::Range, Input::Position>,
+{
+    let map_first_amount = |value: String| {
+        if value.chars().all(char::is_numeric) {
+            let num = value.parse::<i32>()?;
+            Ok(Amount {
+                operator: Operator::Plus,
+                element: Element::Number(num),
+            })
+        } else {
+            Ok(Amount {
+                operator: Operator::Plus,
+                element: Element::Variable(value),
+            })
+        }
+    };
+
+    many1(letter())
+        .or(many1(digit()))
+        .skip(spaces().silent()) //Consume any space after first amount
+        .map(map_first_amount)
+}
+
+/// Attempt to convert some text in the middle or end of the dice roll
+/// string into an Amount.
+fn amount_parser<Input>() -> impl Parser<Input, Output = ParseResult<Amount>>
+where
+    Input: Stream<Token = char>,
+    Input::Error: ParseError<Input::Token, Input::Range, Input::Position>,
+{
+    let plus_or_minus = one_of("+-".chars());
+    let parse_operator = plus_or_minus.map(|sign: char| match sign {
+        '+' => Operator::Plus,
+        '-' => Operator::Minus,
+        _ => Operator::Plus,
+    });
+
+    // Element must either be a proper i32, or a variable name.
+    let map_element = |value: String| -> ParseResult<Element> {
+        if value.chars().all(char::is_numeric) {
+            let num = value.parse::<i32>()?;
+            Ok(Element::Number(num))
+        } else {
+            Ok(Element::Variable(value))
+        }
+    };
+
+    let parse_element = many1(letter()).or(many1(digit())).map(map_element);
+
+    let element_parser = parse_operator
+        .skip(spaces().silent())
+        .and(parse_element)
+        .skip(spaces().silent());
+
+    let convert_to_amount = |(operator, element_result)| match element_result {
+        Ok(element) => Ok(Amount { operator, element }),
+        Err(e) => Err(e),
+    };
+
+    element_parser.map(convert_to_amount)
+}
+
+/// Parse an expression of numbers and/or variables into elements
+/// coupled with operators, where an operator is "+" or "-", and an
+/// element is either a number or variable name. The first element
+/// should not have an operator, but every one after that should.
+/// Accepts expressions like "8", "10 + variablename", "variablename -
+/// 3", etc. This function is currently common to systems that don't
+/// deal with XdY rolls. Support for that will be added later. Returns
+/// parsed amounts and unconsumed input (e.g. roll modifiers).
+pub fn parse_amounts(input: &str) -> ParseResult<(Vec<Amount>, &str)> {
+    let input = input.trim();
+
+    let remaining_amounts = many(amount_parser()).map(|amounts: Vec<ParseResult<Amount>>| amounts);
+    let mut parser = first_amount_parser().and(remaining_amounts);
+
+    // Collapses first amount + remaining amounts into a single Vec,
+    // while collecting extraneous input.
+    type ParsedAmountExpr = (ParseResult<Amount>, Vec<ParseResult<Amount>>);
+    let (results, rest) = parser
+        .parse(input)
+        .map(|mut results: (ParsedAmountExpr, &str)| {
+            let mut amounts = vec![(results.0).0];
+            amounts.append(&mut (results.0).1);
+            (amounts, results.1)
+        })?;
+
+    // Any ParseResult errors will short-circuit the collect.
+    let results: Vec<Amount> = results.into_iter().collect::<ParseResult<_>>()?;
+    Ok((results, rest))
+}
+
+/// Parse an expression that expects a single number or variable. No
+/// operators are allowed. This function is common to systems that
+/// don't deal with XdY rolls. Currently. this function does not
+/// support parsing negative numbers. Returns the parsed amount and
+/// any unconsumed input (useful for dice roll modifiers).
+pub fn parse_single_amount(input: &str) -> ParseResult<(Amount, &str)> {
+    // TODO add support for negative numbers, as technically they
+    // should be allowed.
+    let input = input.trim();
+    let mut parser = first_amount_parser().map(|amount: ParseResult<Amount>| amount);
+    let (result, rest) = parser.parse(input)?;
+    Ok((result?, rest))
+}
+
+#[cfg(test)]
+mod parse_single_amount_tests {
+    use super::*;
+
+    #[test]
+    fn parse_single_variable_test() {
+        let result = parse_single_amount("abc");
+        assert!(result.is_ok());
+        assert_eq!(
+            result.unwrap(),
+            (
+                Amount {
+                    operator: Operator::Plus,
+                    element: Element::Variable("abc".to_string())
+                },
+                ""
+            )
+        )
+    }
+
+    // TODO add support for negative numbers in parse_single_amount
+    // #[test]
+    // fn parse_single_negative_number_test() {
+    //     let result = parse_single_amount("-1");
+    //     assert!(result.is_ok());
+    //     assert_eq!(
+    //         result.unwrap(),
+    //         Amount {
+    //             operator: Operator::Minus,
+    //             element: Element::Number(1)
+    //         }
+    //     )
+    // }
+
+    #[test]
+    fn parse_single_number_test() {
+        let result = parse_single_amount("1");
+        assert!(result.is_ok());
+        assert_eq!(
+            result.unwrap(),
+            (
+                Amount {
+                    operator: Operator::Plus,
+                    element: Element::Number(1)
+                },
+                ""
+            )
+        )
+    }
+}
+
+#[cfg(test)]
+mod parse_many_amounts_tests {
+    use super::*;
+
+    #[test]
+    fn parse_single_number_amount_test() {
+        let result = parse_amounts("1");
+        assert!(result.is_ok());
+        assert_eq!(
+            result.unwrap(),
+            (
+                vec![Amount {
+                    operator: Operator::Plus,
+                    element: Element::Number(1)
+                }],
+                ""
+            )
+        );
+
+        let result = parse_amounts("10");
+        assert!(result.is_ok());
+        assert_eq!(
+            result.unwrap(),
+            (
+                vec![Amount {
+                    operator: Operator::Plus,
+                    element: Element::Number(10)
+                }],
+                ""
+            )
+        );
+    }
+
+    #[test]
+    fn parsing_huge_number_should_error() {
+        // A number outside the bounds of i32 should not be a valid
+        // parse.
+        let result = parse_amounts("159875294375198734982379875392");
+        assert!(result.is_err());
+        assert!(result.unwrap_err() == DiceParsingError::ConversionError);
+    }
+
+    #[test]
+    fn parse_single_variable_amount_test() {
+        let result = parse_amounts("asdf");
+        assert!(result.is_ok());
+        assert_eq!(
+            result.unwrap(),
+            (
+                vec![Amount {
+                    operator: Operator::Plus,
+                    element: Element::Variable("asdf".to_string())
+                }],
+                ""
+            )
+        );
+
+        let result = parse_amounts("nosis");
+        assert!(result.is_ok());
+        assert_eq!(
+            result.unwrap(),
+            (
+                vec![Amount {
+                    operator: Operator::Plus,
+                    element: Element::Variable("nosis".to_string())
+                }],
+                ""
+            )
+        );
+    }
+
+    #[test]
+    fn parse_complex_amount_expression() {
+        assert!(parse_amounts("1 + myvariable - 2").is_ok());
+    }
+}

dicebot/src/parser/mod.rs

@@ -0,0 +1,2 @@
+pub mod dice;
+pub mod variables;

dicebot/src/rpc/mod.rs

@@ -0,0 +1,50 @@
+use crate::error::BotError;
+use crate::{config::Config, db::sqlite::Database};
+use log::{info, warn};
+use matrix_sdk::Client;
+use service::DicebotRpcService;
+use std::sync::Arc;
+use tenebrous_rpc::protos::dicebot::dicebot_server::DicebotServer;
+use tonic::{metadata::MetadataValue, transport::Server, Request, Status};
+
+pub(crate) mod service;
+
+pub async fn serve_grpc(
+    config: &Arc<Config>,
+    db: &Database,
+    client: &Client,
+) -> Result<(), BotError> {
+    match config.rpc_addr().zip(config.rpc_key()) {
+        Some((addr, rpc_key)) => {
+            let expected_bearer = MetadataValue::from_str(&format!("Bearer {}", rpc_key))?;
+            let addr = addr.parse()?;
+
+            let rpc_service = DicebotRpcService {
+                db: db.clone(),
+                config: config.clone(),
+                client: client.clone(),
+            };
+
+            info!("Serving Dicebot gRPC service on {}", addr);
+
+            let interceptor = move |req: Request<()>| match req.metadata().get("authorization") {
+                Some(bearer) if bearer == expected_bearer => Ok(req),
+                _ => Err(Status::unauthenticated("No valid auth token")),
+            };
+
+            let server = DicebotServer::with_interceptor(rpc_service, interceptor);
+
+            Server::builder()
+                .add_service(server)
+                .serve(addr)
+                .await
+                .map_err(|e| e.into())
+        }
+        _ => noop().await,
+    }
+}
+
+pub async fn noop() -> Result<(), BotError> {
+    warn!("RPC address or shared secret not specified. Not enabling gRPC.");
+    Ok(())
+}

dicebot/src/rpc/service.rs

@@ -0,0 +1,117 @@
+use crate::db::{errors::DataError, Variables};
+use crate::error::BotError;
+use crate::matrix;
+use crate::{config::Config, db::sqlite::Database};
+use futures::stream;
+use futures::{StreamExt, TryFutureExt, TryStreamExt};
+use matrix_sdk::ruma::OwnedUserId;
+use matrix_sdk::{room::Joined, Client};
+use std::convert::TryFrom;
+use std::sync::Arc;
+use tenebrous_rpc::protos::dicebot::{
+    dicebot_server::Dicebot, rooms_list_reply::Room, GetAllVariablesReply, GetAllVariablesRequest,
+    RoomsListReply, SetVariableReply, SetVariableRequest, UserIdRequest,
+};
+use tenebrous_rpc::protos::dicebot::{GetVariableReply, GetVariableRequest};
+use tonic::{Code, Request, Response, Status};
+
+impl From<BotError> for Status {
+    fn from(error: BotError) -> Status {
+        Status::new(Code::Internal, error.to_string())
+    }
+}
+
+impl From<DataError> for Status {
+    fn from(error: DataError) -> Status {
+        Status::new(Code::Internal, error.to_string())
+    }
+}
+
+#[derive(Clone)]
+pub(super) struct DicebotRpcService {
+    pub(super) config: Arc<Config>,
+    pub(super) db: Database,
+    pub(super) client: Client,
+}
+
+#[tonic::async_trait]
+impl Dicebot for DicebotRpcService {
+    async fn set_variable(
+        &self,
+        request: Request<SetVariableRequest>,
+    ) -> Result<Response<SetVariableReply>, Status> {
+        let SetVariableRequest {
+            user_id,
+            room_id,
+            variable_name,
+            value,
+        } = request.into_inner();
+
+        self.db
+            .set_user_variable(&user_id, &room_id, &variable_name, value)
+            .await?;
+
+        Ok(Response::new(SetVariableReply { success: true }))
+    }
+
+    async fn get_variable(
+        &self,
+        request: Request<GetVariableRequest>,
+    ) -> Result<Response<GetVariableReply>, Status> {
+        let request = request.into_inner();
+        let value = self
+            .db
+            .get_user_variable(&request.user_id, &request.room_id, &request.variable_name)
+            .await?;
+
+        Ok(Response::new(GetVariableReply { value }))
+    }
+
+    async fn get_all_variables(
+        &self,
+        request: Request<GetAllVariablesRequest>,
+    ) -> Result<Response<GetAllVariablesReply>, Status> {
+        let request = request.into_inner();
+        let variables = self
+            .db
+            .get_user_variables(&request.user_id, &request.room_id)
+            .await?;
+
+        Ok(Response::new(GetAllVariablesReply { variables }))
+    }
+
+    async fn rooms_for_user(
+        &self,
+        request: Request<UserIdRequest>,
+    ) -> Result<Response<RoomsListReply>, Status> {
+        let UserIdRequest { user_id } = request.into_inner();
+        let user_id = OwnedUserId::try_from(user_id).map_err(BotError::from)?;
+
+        let rooms_for_user = matrix::get_rooms_for_user(&self.client, &user_id)
+            .err_into::<BotError>()
+            .await?;
+
+        let mut rooms: Vec<Room> = stream::iter(rooms_for_user)
+            .filter_map(|room: Joined| async move {
+                let room: Result<Room, _> = room.display_name().await.map(|room_name| Room {
+                    room_id: room.room_id().to_string(),
+                    display_name: room_name.to_string(),
+                });
+
+                Some(room)
+            })
+            .err_into::<BotError>()
+            .try_collect()
+            .await?;
+
+        let sort = |r1: &Room, r2: &Room| {
+            r1.display_name
+                .to_lowercase()
+                .cmp(&r2.display_name.to_lowercase())
+        };
+
+        rooms.sort_by(sort);
+
+        Ok(Response::new(RoomsListReply { rooms }))
+    }
+}

dicebot/src/systems/mod.rs

@@ -0,0 +1,21 @@
+use strum::{AsRefStr, Display, EnumIter, EnumString};
+
+#[derive(EnumString, EnumIter, AsRefStr, Display)]
+pub(crate) enum GameSystem {
+    ChroniclesOfDarkness,
+    Changeling,
+    MageTheAwakening,
+    WerewolfTheForsaken,
+    DeviantTheRenegades,
+    MummyTheCurse,
+    PrometheanTheCreated,
+    CallOfCthulhu,
+    DungeonsAndDragons5e,
+    DungeonsAndDragons4e,
+    DungeonsAndDragons35e,
+    DungeonsAndDragons2e,
+    DungeonsAndDragons1e,
+    None,
+}
+
+impl GameSystem {}

rpc/Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+name = "tenebrous-rpc"
+version = "0.1.0"
+authors = ["projectmoon <projectmoon@agnos.is>"]
+edition = "2018"
+description = "gRPC protobuf models for Tenebrous."
+homepage = "https://git.agnos.is/projectmoon/tenebrous-dicebot"
+repository = "https://git.agnos.is/projectmoon/tenebrous-dicebot"
+license = "AGPL-3.0-or-later"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[build-dependencies]
+tonic-build = "0.4"
+
+[dependencies]
+tonic = "0.4"
+prost = "0.7"

rpc/build.rs

@@ -0,0 +1,4 @@
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    tonic_build::compile_protos("protos/dicebot.proto")?;
+    Ok(())
+}

rpc/protos/dicebot.proto

@@ -0,0 +1,52 @@
+syntax = "proto3";
+package dicebot;
+
+service Dicebot {
+  rpc GetVariable(GetVariableRequest) returns (GetVariableReply);
+  rpc GetAllVariables(GetAllVariablesRequest) returns (GetAllVariablesReply);
+  rpc SetVariable(SetVariableRequest) returns (SetVariableReply);
+  rpc RoomsForUser(UserIdRequest) returns (RoomsListReply);
+}
+
+message GetVariableRequest {
+  string user_id = 1;
+  string room_id = 2;
+  string variable_name = 3;
+}
+
+message GetVariableReply {
+  int32 value = 1;
+}
+
+message GetAllVariablesRequest {
+  string user_id = 1;
+  string room_id = 2;
+}
+
+message GetAllVariablesReply {
+  map<string, int32> variables = 1;
+}
+
+message SetVariableRequest {
+  string user_id = 1;
+  string room_id = 2;
+  string variable_name = 3;
+  int32 value = 4;
+}
+
+message SetVariableReply {
+  bool success = 1;
+}
+
+message UserIdRequest {
+  string user_id = 1;
+}
+
+message RoomsListReply {
+  message Room {
+    string room_id = 1;
+    string display_name = 2;
+  }
+
+  repeated Room rooms = 1;
+}

rpc/src/lib.rs

@@ -0,0 +1,5 @@
+pub mod protos {
+    pub mod dicebot {
+        tonic::include_proto!("dicebot");
+    }
+}

src/bin/dicebot-cmd.rs

@@ -1,18 +0,0 @@
-use chronicle_dicebot::commands;
-use chronicle_dicebot::context::Context;
-use chronicle_dicebot::db::Database;
-use chronicle_dicebot::error::BotError;
-
-#[tokio::main]
-async fn main() -> Result<(), BotError> {
-    let db = Database::new_temp()?;
-    let input = std::env::args().skip(1).collect::<Vec<String>>().join(" ");
-    let command = match commands::parse(&input) {
-        Ok(command) => command,
-        Err(e) => return Err(e),
-    };
-
-    let context = Context::new(&db, "roomid", "localuser", &input);
-    println!("{}", command.execute(&context).await.plain());
-    Ok(())
-}

src/bin/dicebot.rs

@@ -1,40 +0,0 @@
-//Needed for nested Result handling from tokio. Probably can go away after 1.47.0.
-#![type_length_limit = "7605144"]
-use chronicle_dicebot::bot::DiceBot;
-use chronicle_dicebot::config::*;
-use chronicle_dicebot::db::Database;
-use chronicle_dicebot::error::BotError;
-use chronicle_dicebot::state::DiceBotState;
-use env_logger::Env;
-use log::error;
-use std::sync::{Arc, RwLock};
-
-#[tokio::main]
-async fn main() {
-    env_logger::from_env(Env::default().default_filter_or("chronicle_dicebot=info,dicebot=info"))
-        .init();
-    match run().await {
-        Ok(_) => (),
-        Err(e) => error!("Error: {}", e),
-    };
-}
-
-async fn run() -> Result<(), BotError> {
-    let config_path = std::env::args()
-        .skip(1)
-        .next()
-        .expect("Need a config as an argument");
-
-    let cfg = Arc::new(read_config(config_path)?);
-    let db = Database::new(&cfg.database_path())?;
-    let state = Arc::new(RwLock::new(DiceBotState::new(&cfg)));
-
-    db.migrate(cfg.migration_version())?;
-
-    match DiceBot::new(&cfg, &state, &db) {
-        Ok(bot) => bot.run().await?,
-        Err(e) => println!("Error connecting: {:?}", e),
-    };
-
-    Ok(())
-}

src/bot.rs

@@ -1,285 +0,0 @@
-use crate::commands::execute_command;
-use crate::config::*;
-use crate::context::Context;
-use crate::db::Database;
-use crate::error::BotError;
-use crate::state::DiceBotState;
-use async_trait::async_trait;
-use dirs;
-use log::{debug, error, info, trace, warn};
-use matrix_sdk::Error as MatrixError;
-use matrix_sdk::{
-    self,
-    events::{
-        room::member::MemberEventContent,
-        room::message::{MessageEventContent, NoticeMessageEventContent, TextMessageEventContent},
-        AnyMessageEventContent, StrippedStateEvent, SyncMessageEvent,
-    },
-    Client, ClientConfig, EventEmitter, JsonStore, Room, SyncRoom, SyncSettings,
-};
-//use matrix_sdk_common_macros::async_trait;
-use std::clone::Clone;
-use std::ops::Sub;
-use std::path::PathBuf;
-use std::sync::{Arc, RwLock};
-use std::time::{Duration, SystemTime};
-use url::Url;
-
-/// The DiceBot struct represents an active dice bot. The bot is not
-/// connected to Matrix until its run() function is called.
-pub struct DiceBot {
-    /// A reference to the configuration read in on application start.
-    config: Arc<Config>,
-
-    /// The matrix client.
-    client: Client,
-
-    /// State of the dicebot
-    state: Arc<RwLock<DiceBotState>>,
-
-    /// Active database layer
-    db: Database,
-}
-
-fn cache_dir() -> Result<PathBuf, BotError> {
-    let mut dir = dirs::cache_dir().ok_or(BotError::NoCacheDirectoryError)?;
-    dir.push("matrix-dicebot");
-    Ok(dir)
-}
-
-/// Creates the matrix client.
-fn create_client(config: &Config) -> Result<Client, BotError> {
-    let cache_dir = cache_dir()?;
-    let store = JsonStore::open(&cache_dir)?;
-    let client_config = ClientConfig::new().state_store(Box::new(store));
-    let homeserver_url = Url::parse(&config.matrix_homeserver())?;
-
-    Ok(Client::new_with_config(homeserver_url, client_config)?)
-}
-
-/// Extracts more detailed error messages out of a matrix SDK error.
-fn extract_error_message(error: MatrixError) -> String {
-    use matrix_sdk::Error::RumaResponse;
-    match error {
-        RumaResponse(ruma_error) => ruma_error.to_string(),
-        _ => error.to_string(),
-    }
-}
-
-impl DiceBot {
-    /// Create a new dicebot with the given configuration and state
-    /// actor. This function returns a Result because it is possible
-    /// for client creation to fail for some reason (e.g. invalid
-    /// homeserver URL).
-    pub fn new(
-        config: &Arc<Config>,
-        state: &Arc<RwLock<DiceBotState>>,
-        db: &Database,
-    ) -> Result<Self, BotError> {
-        Ok(DiceBot {
-            client: create_client(&config)?,
-            config: config.clone(),
-            state: state.clone(),
-            db: db.clone(),
-        })
-    }
-
-    /// Logs the bot into Matrix and listens for events until program
-    /// terminated, or a panic occurs. Originally adapted from the
-    /// matrix-rust-sdk command bot example.
-    pub async fn run(self) -> Result<(), BotError> {
-        let username = &self.config.matrix_username();
-        let password = &self.config.matrix_password();
-
-        //TODO provide a device id from config.
-        let mut client = self.client.clone();
-        client
-            .login(username, password, None, Some("matrix dice bot"))
-            .await?;
-
-        info!("Logged in as {}", username);
-
-        //If the local json store has not been created yet, we need to do a single initial sync.
-        //It stores data under username's localpart.
-        let should_sync = {
-            let mut cache = cache_dir()?;
-            cache.push(username);
-            !cache.exists()
-        };
-
-        if should_sync {
-            info!("Performing initial sync");
-            self.client.sync(SyncSettings::default()).await?;
-        }
-
-        //Attach event handler.
-        client.add_event_emitter(Box::new(self)).await;
-        info!("Listening for commands");
-
-        let token = client
-            .sync_token()
-            .await
-            .ok_or(BotError::SyncTokenRequired)?;
-
-        let settings = SyncSettings::default().token(token);
-
-        //this keeps state from the server streaming in to the dice bot via the EventEmitter trait
-        //TODO somehow figure out how to "sync_until" instead of sync_forever... copy code and modify?
-        client.sync_forever(settings, |_| async {}).await;
-        Ok(())
-    }
-
-    async fn execute_commands(&self, room: &Room, sender_username: &str, msg_body: &str) {
-        let room_name = room.display_name().clone();
-        let room_id = room.room_id.clone();
-
-        let mut results = Vec::with_capacity(msg_body.lines().count());
-
-        for command in msg_body.lines() {
-            let ctx = Context::new(&self.db, &room_id.as_str(), &sender_username, &command);
-
-            if let Some(cmd_result) = execute_command(&ctx).await {
-                results.push(cmd_result);
-            }
-        }
-
-        if results.len() >= 1 {
-            if results.len() == 1 {
-                let cmd_result = &results[0];
-                let response = AnyMessageEventContent::RoomMessage(MessageEventContent::Notice(
-                    NoticeMessageEventContent::html(
-                        cmd_result.plain.clone(),
-                        cmd_result.html.clone(),
-                    ),
-                ));
-
-                let result = self.client.room_send(&room_id, response, None).await;
-                if let Err(e) = result {
-                    let message = extract_error_message(e);
-                    error!("Error sending message: {}", message);
-                };
-            } else if results.len() > 1 {
-                let message = format!("{}: Executed {} commands", sender_username, results.len());
-                let response = AnyMessageEventContent::RoomMessage(MessageEventContent::Notice(
-                    NoticeMessageEventContent::html(&message, &message),
-                ));
-
-                let result = self.client.room_send(&room_id, response, None).await;
-                if let Err(e) = result {
-                    let message = extract_error_message(e);
-                    error!("Error sending message: {}", message);
-                };
-            }
-
-            info!("[{}] {} executed: {}", room_name, sender_username, msg_body);
-        }
-    }
-}
-
-/// Check if a message is recent enough to actually process. If the
-/// message is within "oldest_message_age" seconds, this function
-/// returns true. If it's older than that, it returns false and logs a
-/// debug message.
-fn check_message_age(
-    event: &SyncMessageEvent<MessageEventContent>,
-    oldest_message_age: u64,
-) -> bool {
-    let sending_time = event.origin_server_ts;
-    let oldest_timestamp = SystemTime::now().sub(Duration::new(oldest_message_age, 0));
-
-    if sending_time > oldest_timestamp {
-        true
-    } else {
-        let age = match oldest_timestamp.duration_since(sending_time) {
-            Ok(n) => format!("{} seconds too old", n.as_secs()),
-            Err(_) => "before the UNIX epoch".to_owned(),
-        };
-
-        debug!("Ignoring message because it is {}: {:?}", age, event);
-        false
-    }
-}
-
-async fn should_process<'a>(
-    bot: &DiceBot,
-    event: &SyncMessageEvent<MessageEventContent>,
-) -> Result<(String, String), BotError> {
-    //Ignore messages that are older than configured duration.
-    if !check_message_age(event, bot.config.oldest_message_age()) {
-        let state_check = bot.state.read().unwrap();
-        if !((*state_check).logged_skipped_old_messages()) {
-            drop(state_check);
-            let mut state = bot.state.write().unwrap();
-            (*state).skipped_old_messages();
-        }
-
-        return Err(BotError::ShouldNotProcessError);
-    }
-
-    let (msg_body, sender_username) = if let SyncMessageEvent {
-        content: MessageEventContent::Text(TextMessageEventContent { body, .. }),
-        sender,
-        ..
-    } = event
-    {
-        (
-            body.clone(),
-            format!("@{}:{}", sender.localpart(), sender.server_name()),
-        )
-    } else {
-        (String::new(), String::new())
-    };
-
-    //Command parser can handle non-commands, but faster to
-    //not parse them.
-    if !msg_body.starts_with("!") {
-        trace!("Ignoring non-command: {}", msg_body);
-        return Err(BotError::ShouldNotProcessError);
-    }
-
-    Ok((msg_body, sender_username))
-}
-
-/// This event emitter listens for messages with dice rolling commands.
-/// Originally adapted from the matrix-rust-sdk examples.
-#[async_trait]
-impl EventEmitter for DiceBot {
-    async fn on_stripped_state_member(
-        &self,
-        room: SyncRoom,
-        room_member: &StrippedStateEvent<MemberEventContent>,
-        _: Option<MemberEventContent>,
-    ) {
-        if let SyncRoom::Invited(room) = room {
-            if let Some(user_id) = self.client.user_id().await {
-                if room_member.state_key != user_id {
-                    return;
-                }
-            }
-
-            let room = room.read().await;
-            info!("Autojoining room {}", room.display_name());
-
-            if let Err(e) = self.client.join_room_by_id(&room.room_id).await {
-                warn!("Could not join room: {}", e.to_string())
-            }
-        }
-    }
-
-    async fn on_room_message(&self, room: SyncRoom, event: &SyncMessageEvent<MessageEventContent>) {
-        if let SyncRoom::Joined(room) = room {
-            let (msg_body, sender_username) =
-                if let Ok((msg_body, sender_username)) = should_process(self, &event).await {
-                    (msg_body, sender_username)
-                } else {
-                    return;
-                };
-
-            //we clone here to hold the lock for as little time as possible.
-            let real_room = room.read().await.clone();
-
-            self.execute_commands(&real_room, &sender_username, &msg_body)
-                .await;
-        }
-    }
-}

src/commands.rs

@@ -1,133 +0,0 @@
-use crate::context::Context;
-use crate::error::{BotError, BotError::CommandParsingError};
-use async_trait::async_trait;
-use parser::CommandParsingError::UnrecognizedCommand;
-use thiserror::Error;
-
-pub mod basic_rolling;
-pub mod cofd;
-pub mod cthulhu;
-pub mod misc;
-pub mod parser;
-pub mod variables;
-
-#[derive(Error, Debug)]
-pub enum CommandError {
-    #[error("invalid command: {0}")]
-    InvalidCommand(String),
-
-    #[error("ignored command")]
-    IgnoredCommand,
-}
-
-pub struct Execution {
-    plain: String,
-    html: String,
-}
-
-impl Execution {
-    pub fn plain(&self) -> &str {
-        &self.plain
-    }
-
-    pub fn html(&self) -> &str {
-        &self.html
-    }
-}
-
-#[async_trait]
-pub trait Command: Send + Sync {
-    async fn execute(&self, ctx: &Context<'_>) -> Execution;
-    fn name(&self) -> &'static str;
-}
-
-/// Parse a command string into a dynamic command execution trait
-/// object. Returns an error if a command was recognized but not
-/// parsed correctly. Returns IgnoredCommand error if no command was
-/// recognized.
-pub fn parse(s: &str) -> Result<Box<dyn Command>, BotError> {
-    match parser::parse_command(s) {
-        Ok(command) => Ok(command),
-        Err(CommandParsingError(UnrecognizedCommand(_))) => {
-            Err(CommandError::IgnoredCommand.into())
-        }
-        Err(e) => Err(e),
-    }
-}
-
-pub struct CommandResult {
-    pub plain: String,
-    pub html: String,
-}
-
-/// Attempt to execute a command, and return the content that should
-/// go back to Matrix, if the command was executed (successfully or
-/// not). If a command is determined to be ignored, this function will
-/// return None, signifying that we should not send a response.
-pub async fn execute_command(ctx: &Context<'_>) -> Option<CommandResult> {
-    let res = parse(&ctx.message_body);
-
-    let (plain, html) = match res {
-        Ok(cmd) => {
-            let execution = cmd.execute(ctx).await;
-            (execution.plain().into(), execution.html().into())
-        }
-        Err(BotError::CommandError(CommandError::IgnoredCommand)) => return None,
-        Err(e) => {
-            let message = format!("Error parsing command: {}", e);
-            let html_message = format!("<p><strong>{}</strong></p>", message);
-            (message, html_message)
-        }
-    };
-
-    let plain = format!("{}\n{}", ctx.username, plain);
-    let html = format!("<p>{}</p>\n{}", ctx.username, html);
-
-    Some(CommandResult {
-        plain: plain,
-        html: html,
-    })
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn chance_die_is_not_malformed() {
-        assert!(parse("!chance").is_ok());
-    }
-
-    #[test]
-    fn roll_malformed_expression_test() {
-        assert!(parse("!roll 1d20asdlfkj").is_err());
-        assert!(parse("!roll 1d20asdlfkj   ").is_err());
-    }
-
-    #[test]
-    fn roll_dice_pool_malformed_expression_test() {
-        assert!(parse("!pool 8abc").is_err());
-        assert!(parse("!pool 8abc    ").is_err());
-    }
-
-    #[test]
-    fn pool_whitespace_test() {
-        parse("!pool ns3:8   ").expect("was error");
-        parse("   !pool ns3:8").expect("was error");
-        parse("   !pool ns3:8   ").expect("was error");
-    }
-
-    #[test]
-    fn help_whitespace_test() {
-        parse("!help stuff   ").expect("was error");
-        parse("   !help stuff").expect("was error");
-        parse("   !help stuff   ").expect("was error");
-    }
-
-    #[test]
-    fn roll_whitespace_test() {
-        parse("!roll 1d4 + 5d6 -3   ").expect("was error");
-        parse("!roll 1d4 + 5d6 -3   ").expect("was error");
-        parse("   !roll 1d4 + 5d6 -3   ").expect("was error");
-    }
-}

src/commands/basic_rolling.rs

@@ -1,24 +0,0 @@
-use super::{Command, Execution};
-use crate::context::Context;
-use crate::dice::ElementExpression;
-use crate::roll::Roll;
-use async_trait::async_trait;
-
-pub struct RollCommand(pub ElementExpression);
-
-#[async_trait]
-impl Command for RollCommand {
-    fn name(&self) -> &'static str {
-        "roll regular dice"
-    }
-
-    async fn execute(&self, _ctx: &Context<'_>) -> Execution {
-        let roll = self.0.roll();
-        let plain = format!("Dice: {}\nResult: {}", self.0, roll);
-        let html = format!(
-            "<p><strong>Dice:</strong> {}</p><p><strong>Result</strong>: {}</p>",
-            self.0, roll
-        );
-        Execution { plain, html }
-    }
-}

src/commands/cofd.rs

@@ -1,36 +0,0 @@
-use super::{Command, Execution};
-use crate::cofd::dice::{roll_pool, DicePool, DicePoolWithContext};
-use crate::context::Context;
-use async_trait::async_trait;
-
-pub struct PoolRollCommand(pub DicePool);
-
-#[async_trait]
-impl Command for PoolRollCommand {
-    fn name(&self) -> &'static str {
-        "roll dice pool"
-    }
-
-    async fn execute(&self, ctx: &Context<'_>) -> Execution {
-        let pool_with_ctx = DicePoolWithContext(&self.0, ctx);
-        let roll_result = roll_pool(&pool_with_ctx).await;
-
-        let (plain, html) = match roll_result {
-            Ok(rolled_pool) => {
-                let plain = format!("Pool: {}\nResult: {}", rolled_pool, rolled_pool.roll);
-                let html = format!(
-                    "<p><strong>Pool:</strong> {}</p><p><strong>Result</strong>: {}</p>",
-                    rolled_pool, rolled_pool.roll
-                );
-                (plain, html)
-            }
-            Err(e) => {
-                let plain = format!("Error: {}", e);
-                let html = format!("<p><strong>Error:</strong> {}</p>", e);
-                (plain, html)
-            }
-        };
-
-        Execution { plain, html }
-    }
-}

src/commands/cthulhu.rs

@@ -1,46 +0,0 @@
-use super::{Command, Execution};
-use crate::context::Context;
-use crate::cthulhu::dice::{AdvancementRoll, DiceRoll};
-use async_trait::async_trait;
-
-pub struct CthRoll(pub DiceRoll);
-
-#[async_trait]
-impl Command for CthRoll {
-    fn name(&self) -> &'static str {
-        "roll percentile pool"
-    }
-
-    async fn execute(&self, _ctx: &Context<'_>) -> Execution {
-        //TODO this will be converted to a result when supporting variables.
-        let roll = self.0.roll();
-        let plain = format!("Roll: {}\nResult: {}", self.0, roll);
-        let html = format!(
-            "<p><strong>Roll:</strong> {}</p><p><strong>Result</strong>: {}</p>",
-            self.0, roll
-        );
-
-        Execution { plain, html }
-    }
-}
-
-pub struct CthAdvanceRoll(pub AdvancementRoll);
-
-#[async_trait]
-impl Command for CthAdvanceRoll {
-    fn name(&self) -> &'static str {
-        "roll percentile pool"
-    }
-
-    async fn execute(&self, _ctx: &Context<'_>) -> Execution {
-        //TODO this will be converted to a result when supporting variables.
-        let roll = self.0.roll();
-        let plain = format!("Roll: {}\nResult: {}", self.0, roll);
-        let html = format!(
-            "<p><strong>Roll:</strong> {}</p><p><strong>Result</strong>: {}</p>",
-            self.0, roll
-        );
-
-        Execution { plain, html }
-    }
-}

src/commands/misc.rs

@@ -1,24 +0,0 @@
-use super::{Command, Execution};
-use crate::context::Context;
-use crate::help::HelpTopic;
-use async_trait::async_trait;
-
-pub struct HelpCommand(pub Option<HelpTopic>);
-
-#[async_trait]
-impl Command for HelpCommand {
-    fn name(&self) -> &'static str {
-        "help information"
-    }
-
-    async fn execute(&self, _ctx: &Context<'_>) -> Execution {
-        let help = match &self.0 {
-            Some(topic) => topic.message(),
-            _ => "There is no help for this topic",
-        };
-
-        let plain = format!("Help: {}", help);
-        let html = format!("<p><strong>Help:</strong> {}", help.replace("\n", "<br/>"));
-        Execution { plain, html }
-    }
-}

src/commands/variables.rs

@@ -1,114 +0,0 @@
-use super::{Command, Execution};
-use crate::context::Context;
-use crate::db::errors::DataError;
-use crate::db::variables::UserAndRoom;
-use async_trait::async_trait;
-
-pub struct GetAllVariablesCommand;
-
-#[async_trait]
-impl Command for GetAllVariablesCommand {
-    fn name(&self) -> &'static str {
-        "get all variables"
-    }
-
-    async fn execute(&self, ctx: &Context<'_>) -> Execution {
-        let key = UserAndRoom(&ctx.username, &ctx.room_id);
-        let result = ctx.db.variables.get_user_variables(&key);
-
-        let value = match result {
-            Ok(variables) => {
-                let mut variable_list = variables
-                    .into_iter()
-                    .map(|(name, value)| format!(" - {} = {}", name, value))
-                    .collect::<Vec<_>>();
-
-                variable_list.sort();
-                variable_list.join("\n")
-            }
-            Err(e) => format!("error getting variables: {}", e),
-        };
-
-        let plain = format!("Variables:\n{}", value);
-        let html = format!(
-            "<p><strong>Variables:</strong><br/>{}",
-            value.replace("\n", "<br/>")
-        );
-        Execution { plain, html }
-    }
-}
-
-pub struct GetVariableCommand(pub String);
-
-#[async_trait]
-impl Command for GetVariableCommand {
-    fn name(&self) -> &'static str {
-        "retrieve variable value"
-    }
-
-    async fn execute(&self, ctx: &Context<'_>) -> Execution {
-        let name = &self.0;
-        let key = UserAndRoom(&ctx.username, &ctx.room_id);
-        let result = ctx.db.variables.get_user_variable(&key, name);
-
-        let value = match result {
-            Ok(num) => format!("{} = {}", name, num),
-            Err(DataError::KeyDoesNotExist(_)) => format!("{} is not set", name),
-            Err(e) => format!("error getting {}: {}", name, e),
-        };
-
-        let plain = format!("Variable: {}", value);
-        let html = format!("<p><strong>Variable:</strong> {}", value);
-        Execution { plain, html }
-    }
-}
-
-pub struct SetVariableCommand(pub String, pub i32);
-
-#[async_trait]
-impl Command for SetVariableCommand {
-    fn name(&self) -> &'static str {
-        "set variable value"
-    }
-
-    async fn execute(&self, ctx: &Context<'_>) -> Execution {
-        let name = &self.0;
-        let value = self.1;
-        let key = UserAndRoom(&ctx.username, ctx.room_id);
-        let result = ctx.db.variables.set_user_variable(&key, name, value);
-
-        let content = match result {
-            Ok(_) => format!("{} = {}", name, value),
-            Err(e) => format!("error setting {}: {}", name, e),
-        };
-
-        let plain = format!("Set Variable: {}", content);
-        let html = format!("<p><strong>Set Variable:</strong> {}", content);
-        Execution { plain, html }
-    }
-}
-
-pub struct DeleteVariableCommand(pub String);
-
-#[async_trait]
-impl Command for DeleteVariableCommand {
-    fn name(&self) -> &'static str {
-        "delete variable"
-    }
-
-    async fn execute(&self, ctx: &Context<'_>) -> Execution {
-        let name = &self.0;
-        let key = UserAndRoom(&ctx.username, ctx.room_id);
-        let result = ctx.db.variables.delete_user_variable(&key, name);
-
-        let value = match result {
-            Ok(()) => format!("{} now unset", name),
-            Err(DataError::KeyDoesNotExist(_)) => format!("{} is not currently set", name),
-            Err(e) => format!("error deleting {}: {}", name, e),
-        };
-
-        let plain = format!("Remove Variable: {}", value);
-        let html = format!("<p><strong>Remove Variable:</strong> {}", value);
-        Execution { plain, html }
-    }
-}

src/context.rs

@@ -1,27 +0,0 @@
-use crate::db::Database;
-
-/// A context carried through the system providing access to things
-/// like the database.
-#[derive(Clone)]
-pub struct Context<'a> {
-    pub db: Database,
-    pub room_id: &'a str,
-    pub username: &'a str,
-    pub message_body: &'a str,
-}
-
-impl<'a> Context<'a> {
-    pub fn new(
-        db: &Database,
-        room_id: &'a str,
-        username: &'a str,
-        message_body: &'a str,
-    ) -> Context<'a> {
-        Context {
-            db: db.clone(),
-            room_id: room_id,
-            username: username,
-            message_body: message_body,
-        }
-    }
-}

src/cthulhu/parser.rs

@@ -1,174 +0,0 @@
-use super::dice::{AdvancementRoll, DiceRoll, DiceRollModifier};
-use crate::parser::DiceParsingError;
-
-//TOOD convert these to use parse_amounts from the common dice code.
-
-fn parse_modifier(input: &str) -> Result<(DiceRollModifier, &str), DiceParsingError> {
-    if input.ends_with("bb") {
-        Ok((DiceRollModifier::TwoBonus, input.trim_end_matches("bb")))
-    } else if input.ends_with("b") {
-        Ok((DiceRollModifier::OneBonus, input.trim_end_matches("b")))
-    } else if input.ends_with("pp") {
-        Ok((DiceRollModifier::TwoPenalty, input.trim_end_matches("pp")))
-    } else if input.ends_with("p") {
-        Ok((DiceRollModifier::OnePenalty, input.trim_end_matches("p")))
-    } else {
-        Ok((DiceRollModifier::Normal, input))
-    }
-}
-
-pub fn parse_regular_roll(input: &str) -> Result<DiceRoll, DiceParsingError> {
-    let input = input.trim();
-    let (modifier, input) = parse_modifier(input)?;
-    let target: u32 = input.parse().map_err(|_| DiceParsingError::InvalidAmount)?;
-
-    if target <= 100 {
-        Ok(DiceRoll {
-            target: target,
-            modifier: modifier,
-        })
-    } else {
-        Err(DiceParsingError::InvalidAmount)
-    }
-}
-
-pub fn parse_advancement_roll(input: &str) -> Result<AdvancementRoll, DiceParsingError> {
-    let input = input.trim();
-    let target: u32 = input.parse().map_err(|_| DiceParsingError::InvalidAmount)?;
-
-    if target <= 100 {
-        Ok(AdvancementRoll {
-            existing_skill: target,
-        })
-    } else {
-        Err(DiceParsingError::InvalidAmount)
-    }
-}
-
-#[cfg(test)]
-mod tests {
-
-    use super::*;
-
-    #[test]
-    fn regular_roll_accepts_single_number() {
-        let result = parse_regular_roll("60");
-        assert!(result.is_ok());
-        assert_eq!(
-            DiceRoll {
-                target: 60,
-                modifier: DiceRollModifier::Normal
-            },
-            result.unwrap()
-        );
-    }
-
-    #[test]
-    fn regular_roll_accepts_two_bonus() {
-        let result = parse_regular_roll("60bb");
-        assert!(result.is_ok());
-        assert_eq!(
-            DiceRoll {
-                target: 60,
-                modifier: DiceRollModifier::TwoBonus
-            },
-            result.unwrap()
-        );
-    }
-
-    #[test]
-    fn regular_roll_accepts_one_bonus() {
-        let result = parse_regular_roll("60b");
-        assert!(result.is_ok());
-        assert_eq!(
-            DiceRoll {
-                target: 60,
-                modifier: DiceRollModifier::OneBonus
-            },
-            result.unwrap()
-        );
-    }
-
-    #[test]
-    fn regular_roll_accepts_two_penalty() {
-        let result = parse_regular_roll("60pp");
-        assert!(result.is_ok());
-        assert_eq!(
-            DiceRoll {
-                target: 60,
-                modifier: DiceRollModifier::TwoPenalty
-            },
-            result.unwrap()
-        );
-    }
-
-    #[test]
-    fn regular_roll_accepts_one_penalty() {
-        let result = parse_regular_roll("60p");
-        assert!(result.is_ok());
-        assert_eq!(
-            DiceRoll {
-                target: 60,
-                modifier: DiceRollModifier::OnePenalty
-            },
-            result.unwrap()
-        );
-    }
-
-    #[test]
-    fn regular_roll_accepts_whitespacen() {
-        assert!(parse_regular_roll("60     ").is_ok());
-        assert!(parse_regular_roll("   60").is_ok());
-        assert!(parse_regular_roll("   60    ").is_ok());
-
-        assert!(parse_regular_roll("60bb     ").is_ok());
-        assert!(parse_regular_roll("   60bb").is_ok());
-        assert!(parse_regular_roll("   60bb    ").is_ok());
-
-        assert!(parse_regular_roll("60b     ").is_ok());
-        assert!(parse_regular_roll("   60b").is_ok());
-        assert!(parse_regular_roll("   60b    ").is_ok());
-
-        assert!(parse_regular_roll("60pp     ").is_ok());
-        assert!(parse_regular_roll("   60pp").is_ok());
-        assert!(parse_regular_roll("   60pp    ").is_ok());
-
-        assert!(parse_regular_roll("60p     ").is_ok());
-        assert!(parse_regular_roll("   60p").is_ok());
-        assert!(parse_regular_roll("   60p    ").is_ok());
-    }
-
-    #[test]
-    fn advancement_roll_accepts_whitespacen() {
-        assert!(parse_advancement_roll("60     ").is_ok());
-        assert!(parse_advancement_roll("   60").is_ok());
-        assert!(parse_advancement_roll("   60    ").is_ok());
-    }
-
-    #[test]
-    fn advancement_roll_accepts_single_number() {
-        let result = parse_advancement_roll("60");
-        assert!(result.is_ok());
-        assert_eq!(AdvancementRoll { existing_skill: 60 }, result.unwrap());
-    }
-
-    #[test]
-    fn regular_roll_rejects_big_numbers() {
-        assert!(parse_regular_roll("3000").is_err());
-    }
-
-    #[test]
-    fn advancement_roll_rejects_big_numbers() {
-        assert!(parse_advancement_roll("3000").is_err());
-    }
-
-    #[test]
-    fn regular_roll_rejects_invalid_input() {
-        assert!(parse_regular_roll("abc").is_err());
-    }
-
-    #[test]
-    fn advancement_roll_rejects_invalid_input() {
-        assert!(parse_advancement_roll("abc").is_err());
-    }
-}

src/db.rs

@@ -1,83 +0,0 @@
-use crate::db::errors::{DataError, MigrationError};
-use crate::db::migrations::{get_migration_version, Migrations};
-use crate::db::variables::Variables;
-use log::info;
-use sled::{Config, Db};
-use std::path::Path;
-
-pub mod data_migrations;
-pub mod errors;
-pub mod migrations;
-pub mod schema;
-pub mod variables;
-
-#[derive(Clone)]
-pub struct Database {
-    db: Db,
-    pub(crate) variables: Variables,
-    pub(crate) migrations: Migrations,
-}
-
-impl Database {
-    fn new_db(db: sled::Db) -> Result<Database, DataError> {
-        let migrations = db.open_tree("migrations")?;
-
-        Ok(Database {
-            db: db.clone(),
-            variables: Variables::new(&db)?,
-            migrations: Migrations(migrations),
-        })
-    }
-
-    pub fn new<P: AsRef<Path>>(path: P) -> Result<Database, DataError> {
-        let db = sled::open(path)?;
-        Self::new_db(db)
-    }
-
-    pub fn new_temp() -> Result<Database, DataError> {
-        let config = Config::new().temporary(true);
-        let db = config.open()?;
-        Self::new_db(db)
-    }
-
-    pub fn migrate(&self, to_version: u32) -> Result<(), DataError> {
-        //get version from db
-        let db_version = get_migration_version(&self)?;
-
-        if db_version < to_version {
-            info!(
-                "Migrating database from version {} to version {}",
-                db_version, to_version
-            );
-            //if db version < to_version, proceed
-            //produce range of db_version+1 .. to_version (inclusive)
-            let versions_to_run: Vec<u32> = ((db_version + 1)..=to_version).collect();
-            let migrations = data_migrations::get_migrations(&versions_to_run)?;
-
-            //execute each closure.
-            for (version, migration) in versions_to_run.iter().zip(migrations) {
-                let (migration_func, name) = migration;
-                //This needs to be transactional on migrations
-                //keyspace. abort on migration func error.
-
-                info!("Applying migration {} :: {}", version, name);
-                match migration_func(&self) {
-                    Ok(_) => Ok(()),
-                    Err(e) => Err(e),
-                }?;
-
-                self.migrations.set_migration_version(*version)?;
-            }
-
-            info!("Done applying migrations.");
-            Ok(())
-        } else if db_version > to_version {
-            //if db version > to_version, cannot downgrade error
-            Err(MigrationError::CannotDowngrade.into())
-        } else {
-            //if db version == to_version, do nothing
-            info!("No database migrations needed.");
-            Ok(())
-        }
-    }
-}

src/db/data_migrations.rs

@@ -1,28 +0,0 @@
-use crate::db::errors::{DataError, MigrationError};
-use crate::db::variables::migrations::*;
-use crate::db::Database;
-use phf::phf_map;
-
-pub(super) type DataMigration = (fn(&Database) -> Result<(), DataError>, &'static str);
-
-static MIGRATIONS: phf::Map<u32, DataMigration> = phf_map! {
-    1u32 => (add_room_user_variable_count::migrate, "add_room_user_variable_count"),
-    2u32 => (delete_v0_schema, "delete_v0_schema"),
-    3u32 => (delete_variable_count, "delete_variable_count"),
-    4u32 => (change_delineator_delimiter::migrate, "change_delineator_delimiter"),
-    5u32 => (change_tree_structure::migrate, "change_tree_structure"),
-
-};
-
-pub fn get_migrations(versions: &[u32]) -> Result<Vec<DataMigration>, MigrationError> {
-    let mut migrations: Vec<DataMigration> = vec![];
-
-    for version in versions {
-        match MIGRATIONS.get(version) {
-            Some(func) => migrations.push(*func),
-            None => return Err(MigrationError::MigrationNotFound(*version)),
-        }
-    }
-
-    Ok(migrations)
-}

src/db/errors.rs

@@ -1,74 +0,0 @@
-use sled::transaction::{TransactionError, UnabortableTransactionError};
-use thiserror::Error;
-
-#[derive(Error, Debug)]
-pub enum MigrationError {
-    #[error("cannot downgrade to an older database version")]
-    CannotDowngrade,
-
-    #[error("migration for version {0} not defined")]
-    MigrationNotFound(u32),
-
-    #[error("migration failed: {0}")]
-    MigrationFailed(String),
-}
-
-//TODO better combining of key and value in certain errors (namely
-//I32SchemaViolation).
-#[derive(Error, Debug)]
-pub enum DataError {
-    #[error("value does not exist for key: {0}")]
-    KeyDoesNotExist(String),
-
-    #[error("too many entries")]
-    TooManyEntries,
-
-    #[error("expected i32, but i32 schema was violated")]
-    I32SchemaViolation,
-
-    #[error("expected string, but utf8 schema was violated: {0}")]
-    Utf8chemaViolation(#[from] std::str::Utf8Error),
-
-    #[error("internal database error: {0}")]
-    InternalError(#[from] sled::Error),
-
-    #[error("transaction error: {0}")]
-    TransactionError(#[from] sled::transaction::TransactionError),
-
-    #[error("unabortable transaction error: {0}")]
-    UnabortableTransactionError(#[from] UnabortableTransactionError),
-
-    #[error("data migration error: {0}")]
-    MigrationError(#[from] MigrationError),
-
-    #[error("deserialization error: {0}")]
-    DeserializationError(#[from] bincode::Error),
-}
-
-/// This From implementation is necessary to deal with the recursive
-/// error type in the error enum. We defined a transaction error, but
-/// the only place we use it is when converting from
-/// sled::transaction::TransactionError<DataError>. This converter
-/// extracts the inner data error from transaction aborted errors, and
-/// forwards anything else onward as-is, but wrapped in DataError.
-impl From<TransactionError<DataError>> for DataError {
-    fn from(error: TransactionError<DataError>) -> Self {
-        match error {
-            TransactionError::Abort(data_err) => data_err,
-            TransactionError::Storage(storage_err) => {
-                DataError::TransactionError(TransactionError::Storage(storage_err))
-            }
-        }
-    }
-}
-
-// impl From<ConflictableTransactionError<DataError>> for DataError {
-//     fn from(error: ConflictableTransactionError<DataError>) -> Self {
-//         match error {
-//             ConflictableTransactionError::Abort(data_err) => data_err,
-//             ConflictableTransactionError::Storage(storage_err) => {
-//                 DataError::TransactionError(TransactionError::Storage(storage_err))
-//             }
-//         }
-//     }
-// }

src/db/migrations.rs

@@ -1,54 +0,0 @@
-use crate::db::errors::DataError;
-use crate::db::schema::convert_u32;
-use crate::db::Database;
-use byteorder::LittleEndian;
-use sled::Tree;
-use zerocopy::byteorder::U32;
-use zerocopy::AsBytes;
-
-//This file is for controlling the migration info stored in the
-//database, not actually running migrations.
-
-#[derive(Clone)]
-pub struct Migrations(pub(super) Tree);
-
-const COLON: &'static [u8] = b":";
-const METADATA_SPACE: &'static str = "metadata";
-const MIGRATION_KEY: &'static str = "migration_version";
-
-fn to_key(keyspace: &str, key_name: &str) -> Vec<u8> {
-    let mut key = vec![];
-    key.extend_from_slice(keyspace.as_bytes());
-    key.extend_from_slice(COLON);
-    key.extend_from_slice(key_name.as_bytes());
-    key
-}
-
-fn metadata_key(key_name: &str) -> Vec<u8> {
-    to_key(METADATA_SPACE, key_name)
-}
-
-impl Migrations {
-    pub(super) fn set_migration_version(&self, version: u32) -> Result<(), DataError> {
-        //Rust cannot type infer this transaction
-        let result: Result<_, sled::transaction::TransactionError<DataError>> =
-            self.0.transaction(|tx| {
-                let key = metadata_key(MIGRATION_KEY);
-                let db_value: U32<LittleEndian> = U32::new(version);
-                tx.insert(key, db_value.as_bytes())?;
-                Ok(())
-            });
-
-        result?;
-
-        Ok(())
-    }
-}
-
-pub(super) fn get_migration_version(db: &Database) -> Result<u32, DataError> {
-    let key = metadata_key(MIGRATION_KEY);
-    match db.migrations.0.get(key)? {
-        Some(bytes) => convert_u32(&bytes),
-        None => Ok(0),
-    }
-}

src/db/schema.rs

@@ -1,35 +0,0 @@
-use crate::db::errors::DataError;
-use byteorder::LittleEndian;
-use zerocopy::byteorder::{I32, U32};
-use zerocopy::LayoutVerified;
-
-/// User variables are stored as little-endian 32-bit integers in the
-/// database. This type alias makes the database code more pleasant to
-/// read.
-type LittleEndianI32Layout<'a> = LayoutVerified<&'a [u8], I32<LittleEndian>>;
-
-type LittleEndianU32Layout<'a> = LayoutVerified<&'a [u8], U32<LittleEndian>>;
-
-/// Convert bytes to an i32 with zero-copy deserialization. An error
-/// is returned if the bytes do not represent an i32.
-pub(super) fn convert_i32(raw_value: &[u8]) -> Result<i32, DataError> {
-    let layout = LittleEndianI32Layout::new_unaligned(raw_value.as_ref());
-
-    if let Some(layout) = layout {
-        let value: I32<LittleEndian> = *layout;
-        Ok(value.get())
-    } else {
-        Err(DataError::I32SchemaViolation)
-    }
-}
-
-pub(super) fn convert_u32(raw_value: &[u8]) -> Result<u32, DataError> {
-    let layout = LittleEndianU32Layout::new_unaligned(raw_value.as_ref());
-
-    if let Some(layout) = layout {
-        let value: U32<LittleEndian> = *layout;
-        Ok(value.get())
-    } else {
-        Err(DataError::I32SchemaViolation)
-    }
-}

src/db/variables.rs

@@ -1,371 +0,0 @@
-use crate::db::errors::DataError;
-use crate::db::schema::convert_i32;
-use byteorder::LittleEndian;
-use sled::transaction::{abort, TransactionalTree};
-use sled::Transactional;
-use sled::Tree;
-use std::collections::HashMap;
-use std::convert::From;
-use std::str;
-use zerocopy::byteorder::I32;
-use zerocopy::AsBytes;
-
-pub(super) mod migrations;
-
-#[derive(Clone)]
-pub struct Variables {
-    //room id + username + variable = i32
-    pub(in crate::db) room_user_variables: Tree,
-
-    //room id + username = i32
-    pub(in crate::db) room_user_variable_count: Tree,
-}
-
-/// Request soemthing by a username and room ID.
-pub struct UserAndRoom<'a>(pub &'a str, pub &'a str);
-
-fn to_vec(value: &UserAndRoom<'_>) -> Vec<u8> {
-    let mut bytes = vec![];
-    bytes.extend_from_slice(value.0.as_bytes());
-    bytes.push(0xfe);
-    bytes.extend_from_slice(value.1.as_bytes());
-    bytes
-}
-
-impl From<UserAndRoom<'_>> for Vec<u8> {
-    fn from(value: UserAndRoom) -> Vec<u8> {
-        to_vec(&value)
-    }
-}
-
-impl From<&UserAndRoom<'_>> for Vec<u8> {
-    fn from(value: &UserAndRoom) -> Vec<u8> {
-        to_vec(value)
-    }
-}
-
-/// Use a transaction to atomically alter the count of variables in
-/// the database by the given amount. Count cannot go below 0.
-fn alter_room_variable_count(
-    room_variable_count: &TransactionalTree,
-    user_and_room: &UserAndRoom<'_>,
-    amount: i32,
-) -> Result<i32, DataError> {
-    let key: Vec<u8> = user_and_room.into();
-
-    let mut new_count = match room_variable_count.get(&key)? {
-        Some(bytes) => convert_i32(&bytes)? + amount,
-        None => amount,
-    };
-
-    if new_count < 0 {
-        new_count = 0;
-    }
-
-    let db_value: I32<LittleEndian> = I32::new(new_count);
-    room_variable_count.insert(key, db_value.as_bytes())?;
-    Ok(new_count)
-}
-
-impl Variables {
-    pub(in crate::db) fn new(db: &sled::Db) -> Result<Variables, sled::Error> {
-        Ok(Variables {
-            room_user_variables: db.open_tree("variables")?,
-            room_user_variable_count: db.open_tree("room_user_variable_count")?,
-        })
-    }
-
-    pub fn get_user_variables(
-        &self,
-        key: &UserAndRoom<'_>,
-    ) -> Result<HashMap<String, i32>, DataError> {
-        let mut prefix: Vec<u8> = key.into();
-        prefix.push(0xff);
-        let prefix_len: usize = prefix.len();
-
-        let variables: Result<Vec<_>, DataError> = self
-            .room_user_variables
-            .scan_prefix(prefix)
-            .map(|entry| match entry {
-                Ok((key, raw_value)) => {
-                    //Strips room and username from key, leaving behind name.
-                    let variable_name = str::from_utf8(&key[prefix_len..])?;
-                    Ok((variable_name.to_owned(), convert_i32(&raw_value)?))
-                }
-                Err(e) => Err(e.into()),
-            })
-            .collect();
-
-        //Convert I32 to hash map. collect() inferred via return type.
-        variables.map(|entries| entries.into_iter().collect())
-    }
-
-    pub fn get_variable_count(&self, user_and_room: &UserAndRoom<'_>) -> Result<i32, DataError> {
-        let key: Vec<u8> = user_and_room.into();
-
-        match self.room_user_variable_count.get(&key)? {
-            Some(raw_value) => convert_i32(&raw_value),
-            None => Ok(0),
-        }
-    }
-
-    pub fn get_user_variable(
-        &self,
-        user_and_room: &UserAndRoom<'_>,
-        variable_name: &str,
-    ) -> Result<i32, DataError> {
-        let mut key: Vec<u8> = user_and_room.into();
-        key.push(0xff);
-        key.extend_from_slice(variable_name.as_bytes());
-
-        match self.room_user_variables.get(&key)? {
-            Some(raw_value) => convert_i32(&raw_value),
-            _ => Err(DataError::KeyDoesNotExist(variable_name.to_owned())),
-        }
-    }
-
-    pub fn set_user_variable(
-        &self,
-        user_and_room: &UserAndRoom<'_>,
-        variable_name: &str,
-        value: i32,
-    ) -> Result<(), DataError> {
-        if self.get_variable_count(user_and_room)? >= 100 {
-            return Err(DataError::TooManyEntries);
-        }
-
-        (&self.room_user_variables, &self.room_user_variable_count).transaction(
-            |(tx_vars, tx_counts)| {
-                let mut key: Vec<u8> = user_and_room.into();
-                key.push(0xff);
-                key.extend_from_slice(variable_name.as_bytes());
-
-                let db_value: I32<LittleEndian> = I32::new(value);
-                let old_value = tx_vars.insert(key, db_value.as_bytes())?;
-
-                //Only increment variable count on new keys.
-                if let None = old_value {
-                    if let Err(e) = alter_room_variable_count(&tx_counts, &user_and_room, 1) {
-                        return abort(e);
-                    }
-                }
-
-                Ok(())
-            },
-        )?;
-
-        Ok(())
-    }
-
-    pub fn delete_user_variable(
-        &self,
-        user_and_room: &UserAndRoom<'_>,
-        variable_name: &str,
-    ) -> Result<(), DataError> {
-        (&self.room_user_variables, &self.room_user_variable_count).transaction(
-            |(tx_vars, tx_counts)| {
-                let mut key: Vec<u8> = user_and_room.into();
-                key.push(0xff);
-                key.extend_from_slice(variable_name.as_bytes());
-
-                //TODO why does tx.remove require moving the key?
-                if let Some(_) = tx_vars.remove(key.clone())? {
-                    if let Err(e) = alter_room_variable_count(&tx_counts, user_and_room, -1) {
-                        return abort(e);
-                    }
-                } else {
-                    return abort(DataError::KeyDoesNotExist(variable_name.to_owned()));
-                }
-
-                Ok(())
-            },
-        )?;
-
-        Ok(())
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-    use sled::Config;
-
-    fn create_test_instance() -> Variables {
-        let config = Config::new().temporary(true);
-        let db = config.open().unwrap();
-        Variables::new(&db).unwrap()
-    }
-
-    //Room Variable count tests
-
-    #[test]
-    fn alter_room_variable_count_test() {
-        let variables = create_test_instance();
-        let key = UserAndRoom("username", "room");
-
-        let alter_count = |amount: i32| {
-            variables
-                .room_user_variable_count
-                .transaction(|tx| match alter_room_variable_count(&tx, &key, amount) {
-                    Err(e) => abort(e),
-                    _ => Ok(()),
-                })
-                .expect("got transaction failure");
-        };
-
-        let get_count = |variables: &Variables| -> i32 {
-            variables
-                .get_variable_count(&key)
-                .expect("could not get variable count")
-        };
-
-        //addition
-        alter_count(5);
-        assert_eq!(5, get_count(&variables));
-
-        //subtraction
-        alter_count(-3);
-        assert_eq!(2, get_count(&variables));
-    }
-
-    #[test]
-    fn alter_room_variable_count_cannot_go_below_0_test() {
-        let variables = create_test_instance();
-        let key = UserAndRoom("username", "room");
-
-        variables
-            .room_user_variable_count
-            .transaction(|tx| match alter_room_variable_count(&tx, &key, -1000) {
-                Err(e) => abort(e),
-                _ => Ok(()),
-            })
-            .expect("got transaction failure");
-
-        let count = variables
-            .get_variable_count(&key)
-            .expect("could not get variable count");
-
-        assert_eq!(0, count);
-    }
-
-    #[test]
-    fn empty_db_reports_0_room_variable_count_test() {
-        let variables = create_test_instance();
-        let key = UserAndRoom("username", "room");
-
-        let count = variables
-            .get_variable_count(&key)
-            .expect("could not get variable count");
-
-        assert_eq!(0, count);
-    }
-
-    #[test]
-    fn set_user_variable_increments_count() {
-        let variables = create_test_instance();
-        let key = UserAndRoom("username", "room");
-
-        variables
-            .set_user_variable(&key, "myvariable", 5)
-            .expect("could not insert variable");
-
-        let count = variables
-            .get_variable_count(&key)
-            .expect("could not get variable count");
-
-        assert_eq!(1, count);
-    }
-
-    #[test]
-    fn update_user_variable_does_not_increment_count() {
-        let variables = create_test_instance();
-        let key = UserAndRoom("username", "room");
-
-        variables
-            .set_user_variable(&key, "myvariable", 5)
-            .expect("could not insert variable");
-
-        variables
-            .set_user_variable(&key, "myvariable", 10)
-            .expect("could not update variable");
-
-        let count = variables
-            .get_variable_count(&key)
-            .expect("could not get variable count");
-
-        assert_eq!(1, count);
-    }
-
-    // Set/get/delete variable tests
-
-    #[test]
-    fn set_and_get_variable_test() {
-        let variables = create_test_instance();
-        let key = UserAndRoom("username", "room");
-
-        variables
-            .set_user_variable(&key, "myvariable", 5)
-            .expect("could not insert variable");
-
-        let value = variables
-            .get_user_variable(&key, "myvariable")
-            .expect("could not get value");
-
-        assert_eq!(5, value);
-    }
-
-    #[test]
-    fn cannot_set_more_than_100_variables_per_room() {
-        let variables = create_test_instance();
-        let key = UserAndRoom("username", "room");
-
-        for c in 0..100 {
-            variables
-                .set_user_variable(&key, &format!("myvariable{}", c), 5)
-                .expect("could not insert variable");
-        }
-
-        let result = variables.set_user_variable(&key, "myvariable101", 5);
-        assert!(result.is_err());
-        assert!(matches!(result, Err(DataError::TooManyEntries)));
-    }
-
-    #[test]
-    fn delete_variable_test() {
-        let variables = create_test_instance();
-        let key = UserAndRoom("username", "room");
-
-        variables
-            .set_user_variable(&key, "myvariable", 5)
-            .expect("could not insert variable");
-
-        variables
-            .delete_user_variable(&key, "myvariable")
-            .expect("could not delete value");
-
-        let result = variables.get_user_variable(&key, "myvariable");
-
-        assert!(result.is_err());
-        assert!(matches!(result, Err(DataError::KeyDoesNotExist(_))));
-    }
-
-    #[test]
-    fn get_missing_variable_returns_key_does_not_exist() {
-        let variables = create_test_instance();
-        let key = UserAndRoom("username", "room");
-        let result = variables.get_user_variable(&key, "myvariable");
-
-        assert!(result.is_err());
-        assert!(matches!(result, Err(DataError::KeyDoesNotExist(_))));
-    }
-
-    #[test]
-    fn remove_missing_variable_returns_key_does_not_exist() {
-        let variables = create_test_instance();
-        let key = UserAndRoom("username", "room");
-        let result = variables.delete_user_variable(&key, "myvariable");
-
-        assert!(result.is_err());
-        assert!(matches!(result, Err(DataError::KeyDoesNotExist(_))));
-    }
-}

src/db/variables/migrations.rs

@@ -1,354 +0,0 @@
-use super::*;
-use crate::db::errors::{DataError, MigrationError};
-use crate::db::Database;
-use byteorder::LittleEndian;
-use memmem::{Searcher, TwoWaySearcher};
-use sled::transaction::TransactionError;
-use sled::{Batch, IVec};
-use std::collections::HashMap;
-use zerocopy::byteorder::{I32, U32};
-use zerocopy::AsBytes;
-
-pub(in crate::db) mod add_room_user_variable_count {
-    use super::*;
-    //Not to be confused with the super::RoomAndUser delineator.
-    #[derive(PartialEq, Eq, std::hash::Hash)]
-    struct RoomAndUser {
-        room_id: String,
-        username: String,
-    }
-
-    /// Create a version 0 user variable key.
-    fn v0_variable_key(info: &RoomAndUser, variable_name: &str) -> Vec<u8> {
-        let mut key = vec![];
-        key.extend_from_slice(info.room_id.as_bytes());
-        key.extend_from_slice(info.username.as_bytes());
-        key.extend_from_slice(variable_name.as_bytes());
-        key
-    }
-
-    fn map_value_to_room_and_user(
-        entry: sled::Result<(IVec, IVec)>,
-    ) -> Result<RoomAndUser, MigrationError> {
-        if let Ok((key, _)) = entry {
-            let keys: Vec<Result<&str, _>> = key
-                .split(|&b| b == 0xff)
-                .map(|b| str::from_utf8(b))
-                .collect();
-
-            if let &[_, Ok(room_id), Ok(username), Ok(_variable)] = keys.as_slice() {
-                Ok(RoomAndUser {
-                    room_id: room_id.to_owned(),
-                    username: username.to_owned(),
-                })
-            } else {
-                Err(MigrationError::MigrationFailed(
-                    "a key violates utf8 schema".to_string(),
-                ))
-            }
-        } else {
-            Err(MigrationError::MigrationFailed(
-                "encountered unexpected key".to_string(),
-            ))
-        }
-    }
-
-    fn create_key(room_id: &str, username: &str) -> Vec<u8> {
-        let mut key = b"variables".to_vec();
-        key.push(0xff);
-        key.extend_from_slice(room_id.as_bytes());
-        key.push(0xff);
-        key.extend_from_slice(username.as_bytes());
-        key.push(0xff);
-        key.extend_from_slice(b"variable_count");
-        key
-    }
-
-    pub(in crate::db) fn migrate(db: &Database) -> Result<(), DataError> {
-        let tree = &db.variables.room_user_variables;
-        let prefix = b"variables";
-
-        //Extract a vec of tuples, consisting of room id + username.
-        let results: Vec<RoomAndUser> = tree
-            .scan_prefix(prefix)
-            .map(map_value_to_room_and_user)
-            .collect::<Result<Vec<_>, MigrationError>>()?;
-
-        let counts: HashMap<RoomAndUser, u32> =
-            results
-                .into_iter()
-                .fold(HashMap::new(), |mut count_map, room_and_user| {
-                    let count = count_map.entry(room_and_user).or_insert(0);
-                    *count += 1;
-                    count_map
-                });
-
-        //Start a transaction on the variables tree.
-        let tx_result: Result<_, TransactionError<DataError>> =
-            db.variables.room_user_variables.transaction(|tx_vars| {
-                let batch = counts.iter().fold(Batch::default(), |mut batch, entry| {
-                    let (info, count) = entry;
-
-                    //Add variable count according to new schema.
-                    let key = create_key(&info.room_id, &info.username);
-                    let db_value: U32<LittleEndian> = U32::new(*count);
-                    batch.insert(key, db_value.as_bytes());
-
-                    //Delete the old variable_count variable if exists.
-                    let old_key = v0_variable_key(&info, "variable_count");
-                    batch.remove(old_key);
-                    batch
-                });
-
-                tx_vars.apply_batch(&batch)?;
-                Ok(())
-            });
-
-        tx_result?; //For some reason, it cannot infer the type
-        Ok(())
-    }
-}
-
-pub(in crate::db) fn delete_v0_schema(db: &Database) -> Result<(), DataError> {
-    let mut vars = db.variables.room_user_variables.scan_prefix("");
-    let mut batch = Batch::default();
-
-    while let Some(Ok((key, _))) = vars.next() {
-        let key = key.to_vec();
-
-        if !key.contains(&0xff) {
-            batch.remove(key);
-        }
-    }
-
-    db.variables.room_user_variables.apply_batch(batch)?;
-    Ok(())
-}
-
-pub(in crate::db) fn delete_variable_count(db: &Database) -> Result<(), DataError> {
-    let prefix = b"variables";
-    let mut vars = db.variables.room_user_variables.scan_prefix(prefix);
-    let mut batch = Batch::default();
-
-    while let Some(Ok((key, _))) = vars.next() {
-        let search = TwoWaySearcher::new(b"variable_count");
-        let ends_with = {
-            match search.search_in(&key) {
-                Some(index) => key.len() - index == b"variable_count".len(),
-                None => false,
-            }
-        };
-
-        if ends_with {
-            batch.remove(key);
-        }
-    }
-
-    db.variables.room_user_variables.apply_batch(batch)?;
-    Ok(())
-}
-
-pub(in crate::db) mod change_delineator_delimiter {
-    use super::*;
-
-    /// An entry in the room user variables keyspace.
-    struct UserVariableEntry {
-        room_id: String,
-        username: String,
-        variable_name: String,
-        value: IVec,
-    }
-
-    /// Extract keys and values from the variables keyspace according
-    /// to the v1 schema.
-    fn extract_v1_entries(
-        entry: sled::Result<(IVec, IVec)>,
-    ) -> Result<UserVariableEntry, MigrationError> {
-        if let Ok((key, value)) = entry {
-            let keys: Vec<Result<&str, _>> = key
-                .split(|&b| b == 0xff)
-                .map(|b| str::from_utf8(b))
-                .collect();
-
-            if let &[_, Ok(room_id), Ok(username), Ok(variable)] = keys.as_slice() {
-                Ok(UserVariableEntry {
-                    room_id: room_id.to_owned(),
-                    username: username.to_owned(),
-                    variable_name: variable.to_owned(),
-                    value: value,
-                })
-            } else {
-                Err(MigrationError::MigrationFailed(
-                    "a key violates utf8 schema".to_string(),
-                ))
-            }
-        } else {
-            Err(MigrationError::MigrationFailed(
-                "encountered unexpected key".to_string(),
-            ))
-        }
-    }
-
-    /// Create an old key, where delineator is separated by 0xff.
-    fn create_old_key(prefix: &[u8], insert: &UserVariableEntry) -> Vec<u8> {
-        let mut key = vec![];
-        key.extend_from_slice(&prefix); //prefix already has 0xff.
-        key.extend_from_slice(&insert.room_id.as_bytes());
-        key.push(0xff);
-        key.extend_from_slice(&insert.username.as_bytes());
-        key.push(0xff);
-        key.extend_from_slice(&insert.variable_name.as_bytes());
-        key
-    }
-
-    /// Create an old key, where delineator is separated by 0xfe.
-    fn create_new_key(prefix: &[u8], insert: &UserVariableEntry) -> Vec<u8> {
-        let mut key = vec![];
-        key.extend_from_slice(&prefix); //prefix already has 0xff.
-        key.extend_from_slice(&insert.room_id.as_bytes());
-        key.push(0xfe);
-        key.extend_from_slice(&insert.username.as_bytes());
-        key.push(0xff);
-        key.extend_from_slice(&insert.variable_name.as_bytes());
-        key
-    }
-
-    pub fn migrate(db: &Database) -> Result<(), DataError> {
-        let tree = &db.variables.room_user_variables;
-        let prefix = b"variables";
-
-        let results: Vec<UserVariableEntry> = tree
-            .scan_prefix(&prefix)
-            .map(extract_v1_entries)
-            .collect::<Result<Vec<_>, MigrationError>>()?;
-
-        let mut batch = Batch::default();
-
-        for insert in results {
-            let old = create_old_key(prefix, &insert);
-            let new = create_new_key(prefix, &insert);
-
-            batch.remove(old);
-            batch.insert(new, insert.value);
-        }
-
-        tree.apply_batch(batch)?;
-        Ok(())
-    }
-}
-
-/// Move the user variable entries into two tree structures, with yet
-/// another key format change. Now there is one tree for variable
-/// counts, and one tree for actual user variables. Keys in the user
-/// variable tree were changed to be username-first, then room ID.
-/// They are still separated by 0xfe, while the variable name is
-/// separated by 0xff. Variable count now stores just
-/// USERNAME0xfeROOM_ID and a count in its own tree. This enables
-/// public use of a strongly typed UserAndRoom struct for getting
-/// variables.
-pub(in crate::db) mod change_tree_structure {
-    use super::*;
-
-    /// An entry in the room user variables keyspace.
-    struct UserVariableEntry {
-        room_id: String,
-        username: String,
-        variable_name: String,
-        value: IVec,
-    }
-
-    /// Extract keys and values from the variables keyspace according
-    /// to the v1 schema.
-    fn extract_v1_entries(
-        entry: sled::Result<(IVec, IVec)>,
-    ) -> Result<UserVariableEntry, MigrationError> {
-        if let Ok((key, value)) = entry {
-            let keys: Vec<Result<&str, _>> = key
-                .split(|&b| b == 0xff || b == 0xfe)
-                .map(|b| str::from_utf8(b))
-                .collect();
-
-            if let &[_, Ok(room_id), Ok(username), Ok(variable)] = keys.as_slice() {
-                Ok(UserVariableEntry {
-                    room_id: room_id.to_owned(),
-                    username: username.to_owned(),
-                    variable_name: variable.to_owned(),
-                    value: value,
-                })
-            } else {
-                Err(MigrationError::MigrationFailed(
-                    "a key violates utf8 schema".to_string(),
-                ))
-            }
-        } else {
-            Err(MigrationError::MigrationFailed(
-                "encountered unexpected key".to_string(),
-            ))
-        }
-    }
-
-    /// Create an old key, of "variables" 0xff "room id" 0xfe "username" 0xff "variablename".
-    fn create_old_key(prefix: &[u8], insert: &UserVariableEntry) -> Vec<u8> {
-        let mut key = vec![];
-        key.extend_from_slice(&prefix); //prefix already has 0xff.
-        key.extend_from_slice(&insert.room_id.as_bytes());
-        key.push(0xff);
-        key.extend_from_slice(&insert.username.as_bytes());
-        key.push(0xff);
-        key.extend_from_slice(&insert.variable_name.as_bytes());
-        key
-    }
-
-    /// Create a new key, of "username" 0xfe "room id" 0xff "variablename".
-    fn create_new_key(insert: &UserVariableEntry) -> Vec<u8> {
-        let mut key = vec![];
-        key.extend_from_slice(&insert.username.as_bytes());
-        key.push(0xfe);
-        key.extend_from_slice(&insert.room_id.as_bytes());
-        key.push(0xff);
-        key.extend_from_slice(&insert.variable_name.as_bytes());
-        key
-    }
-
-    pub fn migrate(db: &Database) -> Result<(), DataError> {
-        let variables_tree = &db.variables.room_user_variables;
-        let count_tree = &db.variables.room_user_variable_count;
-        let prefix = b"variables";
-
-        let results: Vec<UserVariableEntry> = variables_tree
-            .scan_prefix(&prefix)
-            .map(extract_v1_entries)
-            .collect::<Result<Vec<_>, MigrationError>>()?;
-
-        let mut counts: HashMap<(String, String), i32> = HashMap::new();
-        let mut batch = Batch::default();
-
-        for insert in results {
-            let count = counts
-                .entry((insert.username.clone(), insert.room_id.clone()))
-                .or_insert(0);
-            *count += 1;
-
-            let old = create_old_key(prefix, &insert);
-            let new = create_new_key(&insert);
-
-            batch.remove(old);
-            batch.insert(new, insert.value);
-        }
-
-        let mut count_batch = Batch::default();
-        counts.into_iter().for_each(|((username, room_id), count)| {
-            let mut key = username.as_bytes().to_vec();
-            key.push(0xfe);
-            key.extend_from_slice(room_id.as_bytes());
-
-            let db_value: I32<LittleEndian> = I32::new(count);
-            count_batch.insert(key, db_value.as_bytes());
-        });
-
-        variables_tree.apply_batch(batch)?;
-        count_tree.apply_batch(count_batch)?;
-
-        Ok(())
-    }
-}

src/dice/parser.rs

@@ -1,170 +0,0 @@
-use nom::{
-    alt, bytes::complete::tag, character::complete::digit1, complete, many0, named,
-    sequence::tuple, tag, IResult,
-};
-
-use crate::dice::{Dice, Element, ElementExpression, SignedElement};
-use crate::parser::eat_whitespace;
-
-#[derive(Debug, PartialEq, Eq, Clone, Copy)]
-enum Sign {
-    Plus,
-    Minus,
-}
-
-// Parse a dice expression.  Does not eat whitespace
-fn parse_dice(input: &str) -> IResult<&str, Dice> {
-    let (input, (count, _, sides)) = tuple((digit1, tag("d"), digit1))(input)?;
-    Ok((
-        input,
-        Dice::new(count.parse().unwrap(), sides.parse().unwrap()),
-    ))
-}
-
-// Parse a single digit expression.  Does not eat whitespace
-fn parse_bonus(input: &str) -> IResult<&str, u32> {
-    let (input, bonus) = digit1(input)?;
-    Ok((input, bonus.parse().unwrap()))
-}
-
-// Parse a sign expression.  Eats whitespace.
-fn parse_sign(input: &str) -> IResult<&str, Sign> {
-    let (input, _) = eat_whitespace(input)?;
-    named!(sign(&str) -> Sign, alt!(
-            complete!(tag!("+")) => { |_| Sign::Plus } |
-            complete!(tag!("-")) => { |_| Sign::Minus }
-    ));
-
-    let (input, sign) = sign(input)?;
-    Ok((input, sign))
-}
-
-// Parse an element expression.  Eats whitespace.
-fn parse_element(input: &str) -> IResult<&str, Element> {
-    let (input, _) = eat_whitespace(input)?;
-    named!(element(&str) -> Element, alt!(
-            parse_dice => { |d| Element::Dice(d) } |
-            parse_bonus => { |b| Element::Bonus(b) }
-    ));
-
-    let (input, element) = element(input)?;
-    Ok((input, element))
-}
-
-// Parse a signed element expression.  Eats whitespace.
-fn parse_signed_element(input: &str) -> IResult<&str, SignedElement> {
-    let (input, _) = eat_whitespace(input)?;
-    let (input, sign) = parse_sign(input)?;
-    let (input, _) = eat_whitespace(input)?;
-
-    let (input, element) = parse_element(input)?;
-    let element = match sign {
-        Sign::Plus => SignedElement::Positive(element),
-        Sign::Minus => SignedElement::Negative(element),
-    };
-    Ok((input, element))
-}
-
-// Parse a full element expression.  Eats whitespace.
-pub fn parse_element_expression(input: &str) -> IResult<&str, ElementExpression> {
-    named!(first_element(&str) -> SignedElement, alt!(
-            parse_signed_element => { |e| e } |
-            parse_element => { |e| SignedElement::Positive(e) }
-    ));
-    let (input, first) = first_element(input)?;
-    let (input, rest) = if input.trim().is_empty() {
-        (input, vec![first])
-    } else {
-        named!(rest_elements(&str) -> Vec<SignedElement>, many0!(parse_signed_element));
-        let (input, mut rest) = rest_elements(input)?;
-        rest.insert(0, first);
-        (input, rest)
-    };
-
-    Ok((input, ElementExpression(rest)))
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-    #[test]
-    fn dice_test() {
-        assert_eq!(parse_dice("2d4"), Ok(("", Dice::new(2, 4))));
-        assert_eq!(parse_dice("20d40"), Ok(("", Dice::new(20, 40))));
-        assert_eq!(parse_dice("8d7"), Ok(("", Dice::new(8, 7))));
-    }
-
-    #[test]
-    fn element_test() {
-        assert_eq!(
-            parse_element("  \t\n\r\n 8d7 \n"),
-            Ok((" \n", Element::Dice(Dice::new(8, 7))))
-        );
-        assert_eq!(
-            parse_element("  \t\n\r\n 8 \n"),
-            Ok((" \n", Element::Bonus(8)))
-        );
-    }
-
-    #[test]
-    fn signed_element_test() {
-        assert_eq!(
-            parse_signed_element("+ 7"),
-            Ok(("", SignedElement::Positive(Element::Bonus(7))))
-        );
-        assert_eq!(
-            parse_signed_element("  \t\n\r\n- 8 \n"),
-            Ok((" \n", SignedElement::Negative(Element::Bonus(8))))
-        );
-        assert_eq!(
-            parse_signed_element("  \t\n\r\n- 8d4 \n"),
-            Ok((
-                " \n",
-                SignedElement::Negative(Element::Dice(Dice::new(8, 4)))
-            ))
-        );
-        assert_eq!(
-            parse_signed_element("  \t\n\r\n+ 8d4 \n"),
-            Ok((
-                " \n",
-                SignedElement::Positive(Element::Dice(Dice::new(8, 4)))
-            ))
-        );
-    }
-
-    #[test]
-    fn element_expression_test() {
-        assert_eq!(
-            parse_element_expression("8d4"),
-            Ok((
-                "",
-                ElementExpression(vec![SignedElement::Positive(Element::Dice(Dice::new(
-                    8, 4
-                )))])
-            ))
-        );
-        assert_eq!(
-            parse_element_expression(" -  8d4 \n "),
-            Ok((
-                " \n ",
-                ElementExpression(vec![SignedElement::Negative(Element::Dice(Dice::new(
-                    8, 4
-                )))])
-            ))
-        );
-        assert_eq!(
-            parse_element_expression("\t3d4 + 7 - 5 - 6d12 + 1d1 + 53 1d5 "),
-            Ok((
-                " 1d5 ",
-                ElementExpression(vec![
-                    SignedElement::Positive(Element::Dice(Dice::new(3, 4))),
-                    SignedElement::Positive(Element::Bonus(7)),
-                    SignedElement::Negative(Element::Bonus(5)),
-                    SignedElement::Negative(Element::Dice(Dice::new(6, 12))),
-                    SignedElement::Positive(Element::Dice(Dice::new(1, 1))),
-                    SignedElement::Positive(Element::Bonus(53)),
-                ])
-            ))
-        );
-    }
-}

src/error.rs

@@ -1,70 +0,0 @@
-use crate::cofd::dice::DiceRollingError;
-use crate::commands::CommandError;
-use crate::config::ConfigError;
-use crate::db::errors::DataError;
-use thiserror::Error;
-
-#[derive(Error, Debug)]
-pub enum BotError {
-    #[error("configuration error: {0}")]
-    ConfigurationError(#[from] ConfigError),
-
-    /// Sync token couldn't be found.
-    #[error("the sync token could not be retrieved")]
-    SyncTokenRequired,
-
-    #[error("command error: {0}")]
-    CommandError(#[from] CommandError),
-
-    #[error("database error: {0}")]
-    DataError(#[from] DataError),
-
-    #[error("the message should not be processed because it failed validation")]
-    ShouldNotProcessError,
-
-    #[error("no cache directory found")]
-    NoCacheDirectoryError,
-
-    #[error("could not parse URL")]
-    UrlParseError(#[from] url::ParseError),
-
-    #[error("uncategorized matrix SDK error")]
-    MatrixError(#[from] matrix_sdk::Error),
-
-    #[error("uncategorized matrix SDK base error")]
-    MatrixBaseError(#[from] matrix_sdk::BaseError),
-
-    #[error("future canceled")]
-    FutureCanceledError,
-
-    //de = deserialization
-    #[error("toml parsing error")]
-    TomlParsingError(#[from] toml::de::Error),
-
-    #[error("i/o error: {0}")]
-    IoError(#[from] std::io::Error),
-
-    #[error("dice parsing error: {0}")]
-    DiceParsingError(#[from] crate::parser::DiceParsingError),
-
-    #[error("command parsing error: {0}")]
-    CommandParsingError(#[from] crate::commands::parser::CommandParsingError),
-
-    #[error("dice pool roll error: {0}")]
-    DiceRollingError(#[from] DiceRollingError),
-
-    #[error("variable parsing error: {0}")]
-    VariableParsingError(#[from] crate::variables::VariableParsingError),
-
-    #[error("legacy parsing error")]
-    NomParserError(nom::error::ErrorKind),
-
-    #[error("legacy parsing error: not enough data")]
-    NomParserIncomplete,
-
-    #[error("variables not yet supported")]
-    VariablesNotSupported,
-
-    #[error("database error")]
-    DatabaseErrror(#[from] sled::Error),
-}

src/help.rs

@@ -1,88 +0,0 @@
-use indoc::indoc;
-
-pub fn parse_help_topic(input: &str) -> Option<HelpTopic> {
-    match input {
-        "cofd" => Some(HelpTopic::ChroniclesOfDarkness),
-        "dicepool" => Some(HelpTopic::DicePool),
-        "dice" => Some(HelpTopic::RollingDice),
-        "" => Some(HelpTopic::General),
-        _ => None,
-    }
-}
-
-pub enum HelpTopic {
-    ChroniclesOfDarkness,
-    DicePool,
-    RollingDice,
-    General,
-}
-
-const COFD_HELP: &'static str = indoc! {"
-Chronicles of Darkness
-
-Commands available:
- !pool, !rp: roll a dice pool
- !chance: roll a chance die
-
-See also:
- !help dicepool
-"};
-
-const DICE_HELP: &'static str = indoc! {"
-Rolling basic dice
-
-Command: !roll, !r
-
-Syntax !roll <dice-expression>
-
-Dice expression can be a basic die (e.g. 1d4), with a bonus (1d4+3),
-or a more complex series of dice rolls or arbitrary numbers.
-Parentheses are not supported.
-
-Examples:
- !roll 1d4
- !roll 1d4+5
- !roll 2d6+8
- !roll 2d8 + 4d6 - 3
-"};
-
-const DICEPOOL_HELP: &'static str = indoc! {"
-Rolling dice pools
-
-Command: !pool, !rp
-
-Syntax: !pool <modifiers>:<num>
-
-Short syntax: !pool <num>
-
-Modifiers:
- n = nine-again
- e = eight-again
- r = rote quality
- x = do not re-roll 10s
- s<num> = number of successes for exceptional
-
-Examples:
- !pool 8 (roll a regular pool of 8 dice)
- !pool n:5 (roll dice pool of 5, nine-again)
- !pool rs3:6 (roll dice pool of 6, rote quality, 3 successes for exceptional)
-"};
-
-const GENERAL_HELP: &'static str = indoc! {"
-General Help
-
-Try these help commands:
-  !help cofd
-  !help dice
-"};
-
-impl HelpTopic {
-    pub fn message(&self) -> &str {
-        match self {
-            HelpTopic::ChroniclesOfDarkness => COFD_HELP,
-            HelpTopic::DicePool => DICEPOOL_HELP,
-            HelpTopic::RollingDice => DICE_HELP,
-            HelpTopic::General => GENERAL_HELP,
-        }
-    }
-}

src/parser.rs

@@ -1,194 +0,0 @@
-use combine::parser::char::{digit, letter, spaces};
-use combine::{many, many1, one_of, Parser};
-use nom::{bytes::complete::take_while, IResult};
-use thiserror::Error;
-
-//******************************
-//New hotness
-//******************************
-#[derive(Debug, Clone, Copy, PartialEq, Error)]
-pub enum DiceParsingError {
-    #[error("invalid amount")]
-    InvalidAmount,
-
-    #[error("modifiers not specified properly")]
-    InvalidModifiers,
-
-    #[error("extraneous input detected")]
-    UnconsumedInput,
-
-    #[error("parser error: {0}")]
-    InternalParseError(#[from] combine::error::StringStreamError),
-}
-
-#[derive(Debug, PartialEq, Eq, Clone)]
-pub enum Operator {
-    Plus,
-    Minus,
-}
-
-impl Operator {
-    pub fn mult(&self) -> i32 {
-        match self {
-            Operator::Plus => 1,
-            Operator::Minus => -1,
-        }
-    }
-}
-
-#[derive(Debug, PartialEq, Eq, Clone)]
-pub enum Element {
-    Variable(String),
-    Number(i32),
-}
-
-#[derive(Debug, PartialEq, Eq, Clone)]
-pub struct Amount {
-    pub operator: Operator,
-    pub element: Element,
-}
-
-/// Parse an expression of numbers and/or variables into elements
-/// coupled with operators, where an operator is "+" or "-", and an
-/// element is either a number or variable name. The first element
-/// should not have an operator, but every one after that should.
-/// Accepts expressions like "8", "10 + variablename", "variablename -
-/// 3", etc. This function is currently common to systems that don't
-/// deal with XdY rolls. Support for that will be added later. Parsers
-/// utilzing this function should layer their own checks on top of
-/// this; perhaps they do not want more than one expression, or some
-/// other rules.
-pub fn parse_amounts(input: &str) -> Result<Vec<Amount>, DiceParsingError> {
-    let input = input.trim();
-
-    let plus_or_minus = one_of("+-".chars());
-    let maybe_sign = plus_or_minus.map(|sign: char| match sign {
-        '+' => Operator::Plus,
-        '-' => Operator::Minus,
-        _ => Operator::Plus,
-    });
-
-    //TODO make this a macro or something
-    let first = many1(letter())
-        .or(many1(digit()))
-        .skip(spaces().silent()) //Consume any space after first amount
-        .map(|value: String| match value.parse::<i32>() {
-            Ok(num) => Amount {
-                operator: Operator::Plus,
-                element: Element::Number(num),
-            },
-            _ => Amount {
-                operator: Operator::Plus,
-                element: Element::Variable(value),
-            },
-        });
-
-    let variable_or_number =
-        many1(letter())
-            .or(many1(digit()))
-            .map(|value: String| match value.parse::<i32>() {
-                Ok(num) => Element::Number(num),
-                _ => Element::Variable(value),
-            });
-
-    let sign_and_word = maybe_sign
-        .skip(spaces().silent())
-        .and(variable_or_number)
-        .skip(spaces().silent())
-        .map(|parsed: (Operator, Element)| Amount {
-            operator: parsed.0,
-            element: parsed.1,
-        });
-
-    let rest = many(sign_and_word).map(|expr: Vec<_>| expr);
-
-    let mut parser = first.and(rest);
-
-    //Maps the found expression into a Vec of Amount instances,
-    //tacking the first one on.
-    type ParsedAmountExpr = (Amount, Vec<Amount>);
-    let (results, rest) = parser
-        .parse(input)
-        .map(|mut results: (ParsedAmountExpr, &str)| {
-            let mut amounts = vec![(results.0).0];
-            amounts.append(&mut (results.0).1);
-            (amounts, results.1)
-        })?;
-
-    if rest.len() == 0 {
-        Ok(results)
-    } else {
-        Err(DiceParsingError::UnconsumedInput)
-    }
-}
-
-//******************************
-//Legacy Code
-//******************************
-
-fn is_whitespace(input: char) -> bool {
-    input == ' ' || input == '\n' || input == '\t' || input == '\r'
-}
-
-/// Eat whitespace, returning it
-pub fn eat_whitespace(input: &str) -> IResult<&str, &str> {
-    let (input, whitespace) = take_while(is_whitespace)(input)?;
-    Ok((input, whitespace))
-}
-
-#[cfg(test)]
-mod tests {
-
-    use super::*;
-
-    #[test]
-    fn parse_single_number_amount_test() {
-        let result = parse_amounts("1");
-        assert!(result.is_ok());
-        assert_eq!(
-            result.unwrap(),
-            vec![Amount {
-                operator: Operator::Plus,
-                element: Element::Number(1)
-            }]
-        );
-
-        let result = parse_amounts("10");
-        assert!(result.is_ok());
-        assert_eq!(
-            result.unwrap(),
-            vec![Amount {
-                operator: Operator::Plus,
-                element: Element::Number(10)
-            }]
-        );
-    }
-
-    #[test]
-    fn parse_single_variable_amount_test() {
-        let result = parse_amounts("asdf");
-        assert!(result.is_ok());
-        assert_eq!(
-            result.unwrap(),
-            vec![Amount {
-                operator: Operator::Plus,
-                element: Element::Variable("asdf".to_string())
-            }]
-        );
-
-        let result = parse_amounts("nosis");
-        assert!(result.is_ok());
-        assert_eq!(
-            result.unwrap(),
-            vec![Amount {
-                operator: Operator::Plus,
-                element: Element::Variable("nosis".to_string())
-            }]
-        );
-    }
-
-    #[test]
-    fn parse_complex_amount_expression() {
-        assert!(parse_amounts("1 + myvariable - 2").is_ok());
-    }
-}