Remove todo, update some CoC command descriptions.

Fixes #54.

.drone.yml

@@ -3,20 +3,18 @@ name: build-and-test
 
 steps:
 - name: test
-  image: rust:1.51
+  image: rust:1.47
   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:
+    branch:
-    - refs/tags/v*
+    - master
-    - refs/heads/master
   settings:
     auto_tag: true
     username:

.env

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

.gitignore

@@ -10,5 +10,3 @@ bot-db*
 # We store a disabled async test in this file
 bigboy
 .#*
-*.sqlite
-.tmp*

Cargo.toml

@@ -1,6 +1,42 @@
-[workspace]
+[package]
+name = "chronicle-dicebot"
+version = "0.9.0"
+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"]
 
-members = [
+[dependencies]
-    "dicebot",
+log = "0.4"
-    "rpc"
+env_logger = "0.8"
-]
+toml = "0.5"
+nom = "5"
+rand = "0.8"
+thiserror = "1.0"
+itertools = "0.10"
+async-trait = "0.1"
+url = "2.1"
+dirs = "3.0"
+indoc = "1.0"
+combine = "4.5"
+sled = "0.34"
+zerocopy = "0.3"
+byteorder = "1.3"
+futures = "0.3"
+memmem = "0.1"
+bincode = "1.3"
+html2text = "0.2"
+phf = { version = "0.8", features = ["macros"] }
+matrix-sdk = { git = "https://github.com/matrix-org/matrix-rust-sdk", branch = "master" }
+
+[dependencies.serde]
+version = "1"
+features = ['derive']
+
+[dependencies.tokio]
+version = "1.0"
+features = [ "full" ]

Dockerfile

@@ -1,15 +1,14 @@
 # Builder image with development dependencies.
 FROM bougyman/voidlinux:glibc as builder
 RUN xbps-install -Syu
-RUN xbps-install -Sy base-devel rustup cargo cmake wget gnupg
+RUN xbps-install -Sy base-devel rust cargo cmake wget gnupg
 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://keyserver.ubuntu.com --recv-keys 595E85A6B1B4779EA4DAAEC70B588DFF0527A9B7 \
+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
 
@@ -17,7 +16,7 @@ RUN chmod +x /usr/local/bin/tini
 RUN mkdir -p /root/src
 WORKDIR /root/src
 ADD . ./
-RUN . /root/.cargo/env && cargo build --release
+RUN cargo build --release
 
 # Final image
 FROM bougyman/voidlinux:tiny

LICENSE

@@ -1,19 +1,7 @@
-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
@@ -32,668 +20,3 @@ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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-if any, to sign a "copyright disclaimer" for the program, if necessary.
-For more information on this, and how to apply and follow the GNU AGPL, see
-<https://www.gnu.org/licenses/>.

README.md

@@ -1,7 +1,6 @@
-# Tenebrous Dicebot
+# matrix-dicebot
 
-[![Build Status](https://drone.agnos.is/api/badges/projectmoon/tenebrous-dicebot/status.svg)](https://drone.agnos.is/projectmoon/tenebrous-dicebot)
+[![Build Status](https://drone.agnos.is/api/badges/projectmoon/matrix-dicebot/status.svg)](https://drone.agnos.is/projectmoon/matrix-dicebot)
-[![Matrix Chat](https://img.shields.io/matrix/tenebrous:agnos.is?label=matrix&server_fqdn=matrix.org)][matrix-room]
 
 _This repository is hosted on [Agnos.is Git][main-repo] and mirrored
 to [GitHub][github-repo]._
@@ -14,9 +13,8 @@ character sheet management.
 
 ## Features
 
-`tenebrous-dicebot` is a dice rolling bot for facilitating
+`matrix-dicebot` is a basic dice rolling bot. It currently has the
-role-playing games over Matrix (and anything that Matrix can bridge
+following features:
-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
@@ -25,23 +23,6 @@ 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
@@ -64,17 +45,6 @@ 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
@@ -175,11 +145,8 @@ Examples:
 !get myvar //will print 5
 ```
 
-Variables can be referenced in dice pool and Call of Cthulhu rolling
+Variables can be referenced in dice pool rolling expressions, for
-expressions, for example `!pool myvar` or `!pool myvar+3` or `!cthroll
+example `!pool myvar` or `!pool myvar+3`.
-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
 
@@ -280,12 +247,6 @@ support added for Chronicles of Darkness and Call of Cthulhu.
 [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
+[main-repo]: https://git.agnos.is/projectmoon/matrix-dicebot
 [github-repo]: https://github.com/ProjectMoon/matrix-dicebot
-[roadmap]: https://git.agnos.is/projectmoon/tenebrous-dicebot/wiki/Roadmap
+[roadmap]: https://git.agnos.is/projectmoon/matrix-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

@@ -1,55 +0,0 @@
-[package]
-name = "tenebrous-dicebot"
-version = "0.13.1"
-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 = "0.3" }
-refinery = { version = "0.6", features = ["rusqlite"]}
-barrel = { version = "0.6", features = ["sqlite3"] }
-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 = "0.5"
-features = [ "offline", "sqlite", "runtime-tokio-native-tls" ]
-
-[dependencies.serde]
-version = "1"
-features = ['derive']
-
-[dependencies.tokio]
-version = "1"
-features = [ "full" ]

dicebot/Dockerfile

@@ -1,35 +0,0 @@
-# Builder image with development dependencies.
-FROM bougyman/voidlinux:glibc as builder
-RUN xbps-install -Syu
-RUN xbps-install -Sy base-devel rustup cargo cmake wget gnupg
-RUN xbps-install -Sy openssl-devel libstdc++-devel
-RUN rustup-init -qy
-RUN rustup component add rustfmt # Needed for protobuf building.
-
-# 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 . /root/.cargo/env && cargo build --release
-
-# Final image
-FROM bougyman/voidlinux:tiny
-RUN xbps-install -Sy ca-certificates libstdc++
-COPY --from=builder \
-    /root/src/target/release/dicebot \
-    /usr/local/bin/
-COPY --from=builder \
-    /usr/local/bin/tini \
-    /usr/local/bin/
-
-ENV XDG_CACHE_HOME "/cache"
-ENV DATABASE_PATH "/cache/bot-db"
-ENTRYPOINT [ "/usr/local/bin/tini", "-v", "--", "/usr/local/bin/dicebot", "/config/dicebot-config.toml" ]

dicebot/sqlx-data.json

@@ -1,139 +0,0 @@
-{
-  "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/bin/dicebot-cmd.rs

@@ -1,51 +0,0 @@
-use matrix_sdk::identifiers::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).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

@@ -1,73 +0,0 @@
-//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)?;
-    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

@@ -1,16 +0,0 @@
-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

@@ -1,33 +0,0 @@
-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

@@ -1,177 +0,0 @@
-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::{
-    self,
-    identifiers::{EventId, RoomId},
-    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: EventId,
-) {
-    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/mod.rs

@@ -1,148 +0,0 @@
-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::{self, identifiers::EventId, room::Joined, Client, 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.
-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();
-
-        client
-            .login(username, password, device_id, Some("matrix dice bot"))
-            .await?;
-
-        if device_id.is_none() {
-            let device_id = client.device_id().await.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(())
-    }
-
-    /// 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?;
-
-        client.set_event_handler(Box::new(self)).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: EventId,
-        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/commands/basic_rolling.rs

@@ -1,48 +0,0 @@
-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/management.rs

@@ -1,200 +0,0 @@
-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/mod.rs

@@ -1,300 +0,0 @@
-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;
-
-    macro_rules! dummy_room {
-        () => {
-            crate::context::RoomContext {
-                id: &matrix_sdk::identifiers::room_id!("!fakeroomid:example.com"),
-                display_name: "displayname".to_owned(),
-                secure: false,
-            }
-        };
-    }
-
-    macro_rules! secure_room {
-        () => {
-            crate::context::RoomContext {
-                id: &matrix_sdk::identifiers::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).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).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).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).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).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/rooms.rs

@@ -1,187 +0,0 @@
-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::{identifiers::UserId, 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 = UserId::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,
-            }))
-        })
-        .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/context.rs

@@ -1,75 +0,0 @@
-use crate::db::sqlite::Database;
-use crate::error::BotError;
-use crate::models::Account;
-use matrix_sdk::identifiers::{RoomId, UserId};
-use matrix_sdk::room::Joined;
-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()
-            .unwrap_or_default()
-            .to_string();
-
-        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/db/errors.rs

@@ -1,32 +0,0 @@
-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

@@ -1,70 +0,0 @@
-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/V1__variables.rs

@@ -1,15 +0,0 @@
-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

@@ -1,18 +0,0 @@
-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

@@ -1,13 +0,0 @@
-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

@@ -1,23 +0,0 @@
-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

@@ -1,22 +0,0 @@
-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

@@ -1,18 +0,0 @@
-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

@@ -1,10 +0,0 @@
-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

@@ -1,18 +0,0 @@
-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

@@ -1,17 +0,0 @@
-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

@@ -1,2 +0,0 @@
-use refinery::include_migration_mods;
-include_migration_mods!("src/db/sqlite/migrator/migrations");

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

@@ -1,33 +0,0 @@
-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),
-}
-
-/// 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");
-    migrations::runner().run(&mut conn)?;
-    Ok(())
-}

dicebot/src/db/sqlite/mod.rs

@@ -1,51 +0,0 @@
-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

@@ -1,93 +0,0 @@
-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

@@ -1,100 +0,0 @@
-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

@@ -1,361 +0,0 @@
-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

@@ -1,257 +0,0 @@
-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/logic.rs

@@ -1,131 +0,0 @@
-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

@@ -1,114 +0,0 @@
-use std::path::PathBuf;
-
-use futures::stream::{self, StreamExt, TryStreamExt};
-use log::error;
-use matrix_sdk::{events::room::message::NoticeMessageEventContent, room::Joined, ClientConfig};
-use matrix_sdk::{
-    events::room::message::{InReplyTo, Relation},
-    events::room::message::{MessageEventContent, MessageType},
-    events::AnyMessageEventContent,
-    identifiers::EventId,
-    Error as MatrixError,
-};
-use matrix_sdk::{identifiers::RoomId, identifiers::UserId, Client};
-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 fn create_client(config: &Config) -> Result<Client, BotError> {
-    let cache_dir = cache_dir()?;
-    let client_config = ClientConfig::new().store_path(cache_dir);
-    let homeserver_url = Url::parse(&config.matrix_homeserver())?;
-
-    Ok(Client::new_with_config(homeserver_url, client_config)?)
-}
-
-/// 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: &UserId,
-) -> 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<EventId>,
-) {
-    let (html, plain) = message;
-    let room = match client.get_joined_room(room_id) {
-        Some(room) => room,
-        _ => return,
-    };
-
-    let mut content = MessageEventContent::new(MessageType::Notice(
-        NoticeMessageEventContent::html(plain.trim(), html),
-    ));
-
-    content.relates_to = reply_to.map(|event_id| Relation::Reply {
-        in_reply_to: InReplyTo::new(event_id),
-    });
-
-    let content = AnyMessageEventContent::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

@@ -1,157 +0,0 @@
-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/mod.rs

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

dicebot/src/rpc/mod.rs

@@ -1,50 +0,0 @@
-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

@@ -1,116 +0,0 @@
-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::{identifiers::UserId, 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 = UserId::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,
-                });
-
-                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 }))
-    }
-}

rpc/Cargo.toml

@@ -1,18 +0,0 @@
-[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

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

rpc/protos/dicebot.proto

@@ -1,52 +0,0 @@
-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

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

src/basic/dice.rs

@@ -1,8 +1,3 @@
-/**
- * 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};
 

src/basic/parser.rs

@@ -1,8 +1,3 @@
-/**
- * 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::{
     alt, bytes::complete::tag, character::complete::digit1, complete, many0, named,

src/basic/roll.rs

@@ -1,8 +1,3 @@
-/**
- * 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 rand::prelude::*;
 use std::fmt;

src/bin/dicebot-cmd.rs

@@ -0,0 +1,32 @@
+use chronicle_dicebot::commands;
+use chronicle_dicebot::commands::ResponseExtractor;
+use chronicle_dicebot::context::{Context, RoomContext};
+use chronicle_dicebot::db::Database;
+use chronicle_dicebot::error::BotError;
+use matrix_sdk::identifiers::room_id;
+
+#[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 context = Context {
+        db: Database::new_temp()?,
+        matrix_client: &matrix_sdk::Client::new("http://example.com")
+            .expect("Could not create matrix client"),
+        room: RoomContext {
+            id: &room_id!("!fakeroomid:example.com"),
+            display_name: "fake room",
+        },
+        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(())
+}

src/bin/dicebot.rs

@@ -0,0 +1,42 @@
+//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::Builder::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

@@ -0,0 +1,244 @@
+use crate::commands::{execute_command, ExecutionError, ExecutionResult, ResponseExtractor};
+use crate::config::*;
+use crate::context::{Context, RoomContext};
+use crate::db::Database;
+use crate::error::BotError;
+use crate::matrix;
+use crate::state::DiceBotState;
+use dirs;
+use futures::stream::{self, StreamExt};
+use log::info;
+use matrix_sdk::{self, identifiers::EventId, room::Joined, Client, ClientConfig, SyncSettings};
+use std::clone::Clone;
+use std::path::PathBuf;
+use std::sync::{Arc, RwLock};
+use url::Url;
+
+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.
+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().store_path(cache_dir);
+    let homeserver_url = Url::parse(&config.matrix_homeserver())?;
+
+    Ok(Client::new_with_config(homeserver_url, client_config)?)
+}
+
+/// Handle responding to a single command being executed. Wil print
+/// out the full result of that command.
+async fn handle_single_result(
+    client: &Client,
+    cmd_result: &ExecutionResult,
+    respond_to: &str,
+    room: &Joined,
+    event_id: EventId,
+) {
+    let html = cmd_result.message_html(respond_to);
+    matrix::send_message(client, room.room_id(), &html, Some(event_id)).await;
+}
+
+/// Handle responding to multiple commands being executed. Will print
+/// out how many commands succeeded and failed (if any failed).
+async fn handle_multiple_results(
+    client: &Client,
+    results: &[(String, ExecutionResult)],
+    respond_to: &str,
+    room: &Joined,
+) {
+    let errors: Vec<(&str, &ExecutionError)> = results
+        .into_iter()
+        .filter_map(|(cmd, result)| match result {
+            Err(e) => Some((cmd.as_ref(), e)),
+            _ => None,
+        })
+        .collect();
+
+    let message = if errors.len() == 0 {
+        format!("{}: Executed {} commands", respond_to, results.len())
+    } else {
+        let failures: Vec<String> = errors
+            .iter()
+            .map(|&(cmd, err)| format!("<strong>{}:</strong> {}", cmd, err))
+            .collect();
+
+        format!(
+            "{}: Executed {} commands ({} failed)\n\nFailures:\n{}",
+            respond_to,
+            results.len(),
+            errors.len(),
+            failures.join("\n")
+        )
+        .replace("\n", "<br/>")
+    };
+
+    matrix::send_message(client, room.room_id(), &message, None).await;
+}
+
+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 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.state.get_device_id()?;
+        let device_id: Option<&str> = device_id.as_deref();
+
+        client
+            .login(username, password, device_id, Some("matrix dice bot"))
+            .await?;
+
+        if device_id.is_none() {
+            let device_id = client.device_id().await.ok_or(BotError::NoDeviceIdFound)?;
+            self.db.state.set_device_id(device_id.as_str())?;
+            info!("Recorded new device ID: {}", device_id.as_str());
+        } else {
+            info!("Using existing device ID: {}", device_id.unwrap());
+        }
+
+        info!("Logged in as {}", username);
+        Ok(())
+    }
+
+    /// 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?;
+
+        // Initial sync without event handler prevents responding to
+        // messages received while bot was offline. TODO: selectively
+        // respond to old messages? e.g. comands missed while offline.
+        info!("Performing intial sync (no commands will be responded to)");
+        self.client.sync_once(SyncSettings::default()).await?;
+
+        client.set_event_handler(Box::new(self)).await;
+        info!("Listening for commands");
+
+        let token = client
+            .sync_token()
+            .await
+            .ok_or(BotError::SyncTokenRequired)?;
+
+        let settings = SyncSettings::default().token(token);
+
+        // TODO replace with sync_with_callback for cleaner shutdown
+        // process.
+        client.sync(settings).await;
+        Ok(())
+    }
+
+    async fn execute_commands(
+        &self,
+        room: &Joined,
+        sender_username: &str,
+        msg_body: &str,
+    ) -> Vec<(String, ExecutionResult)> {
+        let room_name: &str = &room.display_name().await.ok().unwrap_or_default();
+
+        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 {
+            stream::iter(commands)
+                .then(|command| async move {
+                    let ctx = Context {
+                        db: self.db.clone(),
+                        matrix_client: &self.client,
+                        room: RoomContext::new_with_name(&room, room_name),
+                        username: &sender_username,
+                        message_body: &command,
+                    };
+
+                    let cmd_result = execute_command(&ctx).await;
+                    info!("[{}] {} executed: {}", room_name, sender_username, command);
+                    (command.to_owned(), cmd_result)
+                })
+                .collect()
+                .await
+        } else {
+            vec![(
+                "".to_owned(),
+                Err(ExecutionError(BotError::MessageTooLarge)),
+            )]
+        };
+
+        results
+    }
+
+    pub async fn handle_results(
+        &self,
+        room: &Joined,
+        sender_username: &str,
+        event_id: EventId,
+        results: Vec<(String, ExecutionResult)>,
+    ) {
+        if results.len() >= 1 {
+            if results.len() == 1 {
+                handle_single_result(
+                    &self.client,
+                    &results[0].1,
+                    sender_username,
+                    &room,
+                    event_id,
+                )
+                .await;
+            } else if results.len() > 1 {
+                handle_multiple_results(&self.client, &results, sender_username, &room).await;
+            }
+        }
+    }
+}

src/bot/event_handlers.rs

@@ -1,22 +1,22 @@
 use super::DiceBot;
-use crate::db::sqlite::Database;
+use crate::db::Database;
-use crate::db::Rooms;
 use crate::error::BotError;
+use crate::logic::record_room_information;
 use async_trait::async_trait;
 use log::{debug, error, info, warn};
 use matrix_sdk::{
     self,
     events::{
-        room::member::MemberEventContent,
+        room::member::{MemberEventContent, MembershipChange},
         room::message::{MessageEventContent, MessageType, TextMessageEventContent},
-        StrippedStateEvent, SyncMessageEvent,
+        StrippedStateEvent, SyncMessageEvent, SyncStateEvent,
     },
-    room::Room,
+    room::{Common, Invited, Joined},
-    EventHandler,
+    EventHandler, Room,
 };
+use std::clone::Clone;
 use std::ops::Sub;
 use std::time::{Duration, SystemTime};
-use std::{clone::Clone, time::UNIX_EPOCH};
 
 /// Check if a message is recent enough to actually process. If the
 /// message is within "oldest_message_age" seconds, this function
@@ -26,11 +26,7 @@ fn check_message_age(
     event: &SyncMessageEvent<MessageEventContent>,
     oldest_message_age: u64,
 ) -> bool {
-    let sending_time = event
+    let sending_time = event.origin_server_ts;
-        .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 {
@@ -89,9 +85,9 @@ async fn should_process_message<'a>(
     Ok((msg_body, sender_username))
 }
 
-async fn should_process_event(db: &Database, room_id: &str, event_id: &str) -> bool {
+fn should_process_event(db: &Database, room_id: &str, event_id: &str) -> bool {
-    db.should_process(room_id, event_id)
+    db.rooms
-        .await
+        .should_process(room_id, event_id)
         .unwrap_or_else(|e| {
             error!(
                 "Database error when checking if we should process an event: {}",
@@ -105,14 +101,72 @@ async fn should_process_event(db: &Database, room_id: &str, event_id: &str) -> b
 /// Originally adapted from the matrix-rust-sdk examples.
 #[async_trait]
 impl EventHandler for DiceBot {
+    async fn on_room_member(&self, room: Room, event: &SyncStateEvent<MemberEventContent>) {
+        let room = Common::new(self.client.clone(), room);
+        let (room_id, room_display_name) = match room.display_name().await {
+            Ok(display_name) => (room.room_id(), display_name),
+            _ => return,
+        };
+
+        let room_id_str = room_id.as_str();
+        let username = &event.state_key;
+
+        if !should_process_event(&self.db, room_id_str, event.event_id.as_str()) {
+            return;
+        }
+
+        let event_affects_us = if let Some(our_user_id) = self.client.user_id().await {
+            event.state_key == our_user_id
+        } else {
+            false
+        };
+
+        use MembershipChange::*;
+        let adding_user = match event.membership_change() {
+            Joined => true,
+            Banned | Left | Kicked | KickedAndBanned => false,
+            _ => return,
+        };
+
+        let result = if event_affects_us && !adding_user {
+            info!("Clearing all information for room ID {}", room_id);
+            self.db.rooms.clear_info(room_id_str)
+        } else if event_affects_us && adding_user {
+            info!("Joined room {}; recording room information", room_id);
+            record_room_information(
+                &self.client,
+                &self.db,
+                &room_id,
+                &room_display_name,
+                &event.state_key,
+            )
+            .await
+        } else if !event_affects_us && adding_user {
+            info!("Adding user {} to room ID {}", username, room_id);
+            self.db.rooms.add_user_to_room(username, room_id_str)
+        } else if !event_affects_us && !adding_user {
+            info!("Removing user {} from room ID {}", username, room_id);
+            self.db.rooms.remove_user_from_room(username, room_id_str)
+        } else {
+            debug!("Ignoring a room member event: {:#?}", event);
+            Ok(())
+        };
+
+        if let Err(e) = result {
+            error!("Could not update room information: {}", e.to_string());
+        } else {
+            debug!("Successfully processed room member update.");
+        }
+    }
+
     async fn on_stripped_state_member(
         &self,
         room: Room,
         event: &StrippedStateEvent<MemberEventContent>,
         _: Option<MemberEventContent>,
     ) {
-        let room = match room {
+        let room = match Invited::new(self.client.clone(), room) {
-            Room::Invited(invited_room) => invited_room,
+            Some(invited_room) => invited_room,
             _ => return,
         };
 
@@ -120,6 +174,12 @@ impl EventHandler for DiceBot {
             return;
         }
 
+        // if let Some(user_id) = self.client.user_id().await {
+        //     if event.state_key != user_id {
+        //         return;
+        //     }
+        // }
+
         info!(
             "Autojoining room {}",
             room.display_name().await.ok().unwrap_or_default()
@@ -131,13 +191,13 @@ impl EventHandler for DiceBot {
     }
 
     async fn on_room_message(&self, room: Room, event: &SyncMessageEvent<MessageEventContent>) {
-        let room = match room {
+        let room = match Joined::new(self.client.clone(), room) {
-            Room::Joined(joined_room) => joined_room,
+            Some(joined_room) => joined_room,
             _ => return,
         };
 
         let room_id = room.room_id().as_str();
-        if !should_process_event(&self.db, room_id, event.event_id.as_str()).await {
+        if !should_process_event(&self.db, room_id, event.event_id.as_str()) {
             return;
         }
 

src/cofd/dice.rs

@@ -1,6 +1,6 @@
 use crate::context::Context;
 use crate::error::{BotError, DiceRollingError};
-use crate::parser::dice::{Amount, Element, Operator};
+use crate::parser::{Amount, Element, Operator};
 use itertools::Itertools;
 use std::convert::TryFrom;
 use std::fmt;
@@ -308,7 +308,7 @@ pub async fn roll_pool(pool: &DicePoolWithContext<'_>) -> Result<RolledDicePool,
         return Err(DiceRollingError::ExpressionTooLarge.into());
     }
 
-    let num_dice = crate::logic::calculate_dice_amount(&pool.0.amounts, &pool.1).await?;
+    let num_dice = crate::dice::calculate_dice_amount(&pool.0.amounts, &pool.1).await?;
     let mut roller = RngDieRoller(rand::thread_rng());
 
     if num_dice > 0 {
@@ -325,16 +325,13 @@ pub async fn roll_pool(pool: &DicePoolWithContext<'_>) -> Result<RolledDicePool,
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::db::sqlite::Database;
+    use crate::db::Database;
-    use crate::db::Variables;
-    use url::Url;
 
     macro_rules! dummy_room {
         () => {
             crate::context::RoomContext {
                 id: &matrix_sdk::identifiers::room_id!("!fakeroomid:example.com"),
-                display_name: "displayname".to_owned(),
+                display_name: "displayname",
-                secure: false,
             }
         };
     }
@@ -465,8 +462,8 @@ mod tests {
         assert_eq!(vec![10], roll);
     }
 
-    #[test]
+    #[tokio::test]
-    fn number_of_dice_equality_test() {
+    async 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);
@@ -474,20 +471,13 @@ mod tests {
         assert_eq!(5, rolled_pool.num_dice);
     }
 
-    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
+    #[tokio::test]
     async fn rejects_large_expression_test() {
-        let db_path = tempfile::NamedTempFile::new_in(".").unwrap();
+        let db = Database::new_temp().unwrap();
-        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).unwrap(),
+            matrix_client: &matrix_sdk::Client::new("http://example.com").unwrap(),
-            origin_room: dummy_room!(),
+            room: dummy_room!(),
-            active_room: dummy_room!(),
             username: "username",
             message_body: "message",
         };
@@ -512,24 +502,13 @@ mod tests {
         ));
     }
 
-    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
+    #[tokio::test]
     async fn converts_to_chance_die_test() {
-        let db_path = tempfile::NamedTempFile::new_in(".").unwrap();
+        let db = Database::new_temp().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).unwrap(),
+            matrix_client: &matrix_sdk::Client::new("http://example.com").unwrap(),
-            origin_room: dummy_room!(),
+            room: dummy_room!(),
-            active_room: dummy_room!(),
             username: "username",
             message_body: "message",
         };
@@ -551,36 +530,24 @@ mod tests {
         assert_eq!(1, roll.num_dice);
     }
 
-    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
+    #[tokio::test]
     async fn can_resolve_variables_test() {
-        let db_path = tempfile::NamedTempFile::new_in(".").unwrap();
+        use crate::db::variables::UserAndRoom;
-        crate::db::sqlite::migrator::migrate(db_path.path().to_str().unwrap())
-            .await
-            .unwrap();
 
-        let db = Database::new(db_path.path().to_str().unwrap())
+        let db = Database::new_temp().unwrap();
-            .await
-            .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).unwrap(),
+            matrix_client: &matrix_sdk::Client::new("http://example.com").unwrap(),
-            origin_room: dummy_room!(),
+            room: dummy_room!(),
-            active_room: dummy_room!(),
             username: "username",
             message_body: "message",
         };
 
-        db.set_user_variable(
+        let user_and_room = UserAndRoom(&ctx.username, &ctx.room.id.as_str());
-            &ctx.username,
+
-            &ctx.origin_room.id.as_str(),
+        db.variables
-            "myvariable",
+            .set_user_variable(&user_and_room, "myvariable", 10)
-            10,
+            .expect("could not set myvariable to 10");
-        )
-        .await
-        .expect("could not set myvariable to 10");
 
         let amounts = vec![Amount {
             operator: Operator::Plus,
@@ -590,7 +557,7 @@ mod tests {
         let pool = DicePool::new(amounts, DicePoolModifiers::default());
 
         assert_eq!(
-            crate::logic::calculate_dice_amount(&pool.amounts, &ctx)
+            crate::dice::calculate_dice_amount(&pool.amounts, &ctx)
                 .await
                 .unwrap(),
             10

src/cofd/parser.rs

@@ -1,6 +1,6 @@
 use crate::cofd::dice::{DicePool, DicePoolModifiers, DicePoolQuality};
 use crate::error::BotError;
-use crate::parser::dice::{parse_amounts, DiceParsingError};
+use crate::parser::{parse_amounts, DiceParsingError};
 use combine::parser::char::{digit, spaces, string};
 use combine::{choice, count, many1, one_of, Parser};
 
@@ -201,7 +201,7 @@ mod tests {
 
     #[test]
     fn dice_pool_complex_expression_test() {
-        use crate::parser::dice::*;
+        use crate::parser::*;
         let modifiers = DicePoolModifiers::custom(DicePoolQuality::Rote, 3);
         let amounts = vec![
             Amount {

src/commands.rs

@@ -0,0 +1,142 @@
+use crate::context::Context;
+use crate::error::BotError;
+use async_trait::async_trait;
+use thiserror::Error;
+
+pub mod basic_rolling;
+pub mod cofd;
+pub mod cthulhu;
+pub mod management;
+pub mod misc;
+pub mod parser;
+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("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 a command execution failure. Provides HTML formatting for
+/// any error message from the BotError type, similar to how Execution
+/// provides formatting for successfully executed commands.
+#[derive(Error, Debug)]
+#[error("{0}")]
+pub struct ExecutionError(#[from] pub BotError);
+
+impl From<crate::db::errors::DataError> for ExecutionError {
+    fn from(error: crate::db::errors::DataError) -> Self {
+        Self(BotError::DataError(error))
+    }
+}
+
+impl ExecutionError {
+    /// Error message in bolded HTML.
+    pub fn html(&self) -> String {
+        format!("<p><strong>{}</strong></p>", self.0)
+    }
+}
+
+/// Wraps either a successful command execution response, or an error
+/// that occurred.
+pub type ExecutionResult = Result<Execution, ExecutionError>;
+
+/// 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;
+}
+
+impl ResponseExtractor for ExecutionResult {
+    /// Error message in bolded HTML.
+    fn message_html(&self, username: &str) -> String {
+        //TODO use user display name too
+        let username = format!(
+            "<a href=\"https://matrix.to/#/{}\">{}</a>",
+            username, username
+        );
+        match self {
+            Ok(resp) => format!("<p>{}</p><p>{}</p>", username, resp.html).replace("\n", "<br/>"),
+            Err(e) => format!("<p>{}</p><p>{}</p>", username, e.html()).replace("\n", "<br/>"),
+        }
+    }
+}
+
+/// 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;
+}
+
+/// 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<'_>) -> ExecutionResult {
+    let cmd = parser::parse_command(&ctx.message_body)?;
+    cmd.execute(ctx).await
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    macro_rules! dummy_room {
+        () => {
+            crate::context::RoomContext {
+                id: &matrix_sdk::identifiers::room_id!("!fakeroomid:example.com"),
+                display_name: "displayname",
+            }
+        };
+    }
+
+    #[test]
+    fn command_result_extractor_creates_bubble() {
+        let result = Execution::success("test".to_string());
+        let message = result.message_html("@myuser:example.com");
+        assert!(message.contains(
+            "<a href=\"https://matrix.to/#/@myuser:example.com\">@myuser:example.com</a>"
+        ));
+    }
+
+    #[tokio::test]
+    async fn unrecognized_command() {
+        let db = crate::db::Database::new_temp().unwrap();
+        let ctx = Context {
+            db: db,
+            matrix_client: &matrix_sdk::Client::new("http://example.com").unwrap(),
+            room: dummy_room!(),
+            username: "myusername",
+            message_body: "!notacommand",
+        };
+        let result = execute_command(&ctx).await;
+        assert!(result.is_err());
+    }
+}

src/commands/basic_rolling.rs

@@ -0,0 +1,24 @@
+use super::{Command, Execution, ExecutionResult};
+use crate::basic::dice::ElementExpression;
+use crate::basic::roll::Roll;
+use crate::context::Context;
+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<'_>) -> ExecutionResult {
+        let roll = self.0.roll();
+        let html = format!(
+            "<p><strong>Dice:</strong> {}</p><p><strong>Result</strong>: {}</p>",
+            self.0, roll
+        );
+
+        Execution::success(html)
+    }
+}

src/commands/cofd.rs

@@ -1,45 +1,22 @@
 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>: {}",
+            "<p><strong>Pool:</strong> {}</p><p><strong>Result</strong>: {}</p>",
             rolled_pool, rolled_pool.roll
         );
 

src/commands/cthulhu.rs

@@ -4,38 +4,22 @@ 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>: {}",
+            "<p><strong>Roll:</strong> {}</p><p><strong>Result</strong>: {}</p>",
             executed_roll, executed_roll.roll
         );
 
@@ -45,30 +29,17 @@ impl Command for CthRoll {
 
 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>: {}",
+            "<p><strong>Roll:</strong> {}</p><p><strong>Result</strong>: {}</p>",
             executed_roll, executed_roll.roll
         );
 

src/commands/management.rs

@@ -0,0 +1,31 @@
+use super::{Command, Execution, ExecutionResult};
+use crate::context::Context;
+use crate::logic::record_room_information;
+use async_trait::async_trait;
+use matrix_sdk::identifiers::UserId;
+
+pub struct ResyncCommand;
+
+#[async_trait]
+impl Command for ResyncCommand {
+    fn name(&self) -> &'static str {
+        "resync room information"
+    }
+
+    async fn execute(&self, ctx: &Context<'_>) -> ExecutionResult {
+        let our_username: Option<UserId> = ctx.matrix_client.user_id().await;
+        let our_username: &str = our_username.as_ref().map_or("", UserId::as_str);
+
+        record_room_information(
+            ctx.matrix_client,
+            &ctx.db,
+            ctx.room_id(),
+            &ctx.room.display_name,
+            our_username,
+        )
+        .await?;
+
+        let message = "Room information resynced.".to_string();
+        Execution::success(message)
+    }
+}

src/commands/misc.rs

@@ -1,31 +1,16 @@
 use super::{Command, Execution, ExecutionResult};
 use crate::context::Context;
-use crate::error::BotError;
+use crate::help::HelpTopic;
-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(),

src/commands/parser.rs

@@ -1,24 +1,23 @@
-/**
+use crate::basic::parser::parse_element_expression;
- * In addition to the terms of the AGPL, portions of this file are
+use crate::cofd::parser::{create_chance_die, parse_dice_pool};
- * 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},
+    management::ResyncCommand,
     misc::HelpCommand,
-    rooms::{ListRoomsCommand, SetRoomCommand},
     variables::{
         DeleteVariableCommand, GetAllVariablesCommand, GetVariableCommand, SetVariableCommand,
     },
     Command,
 };
+use crate::cthulhu::parser::{parse_advancement_roll, parse_regular_roll};
 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 std::convert::TryFrom;
+use nom::Err as NomErr;
 use thiserror::Error;
 
 #[derive(Debug, Clone, PartialEq, Error)]
@@ -30,6 +29,65 @@ 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 parse_resync() -> Result<Box<dyn Command>, BotError> {
+    Ok(Box::new(ResyncCommand))
+}
+
+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).
@@ -61,37 +119,23 @@ 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, return an error.
 pub fn parse_command(input: &str) -> Result<Box<dyn Command>, BotError> {
     match split_command(input) {
-        Ok((cmd, cmd_input)) => match cmd.to_lowercase().as_ref() {
+        Ok((cmd, cmd_input)) => match cmd.as_ref() {
-            "variables" => convert_to!(GetAllVariablesCommand, cmd_input),
+            "variables" => get_all_variables(),
-            "get" => convert_to!(GetVariableCommand, cmd_input),
+            "get" => parse_get_variable_command(&cmd_input),
-            "set" => convert_to!(SetVariableCommand, cmd_input),
+            "set" => parse_set_variable_command(&cmd_input),
-            "del" => convert_to!(DeleteVariableCommand, cmd_input),
+            "del" => parse_delete_variable_command(&cmd_input),
-            "r" | "roll" => convert_to!(RollCommand, cmd_input),
+            "resync" => parse_resync(),
-            "rp" | "pool" => convert_to!(PoolRollCommand, cmd_input),
+            "r" | "roll" => parse_roll(&cmd_input),
-            "chance" => PoolRollCommand::chance_die().map(|cmd| Box::new(cmd) as Box<dyn Command>),
+            "rp" | "pool" => parse_pool_roll(&cmd_input),
-            "cthroll" => convert_to!(CthRoll, cmd_input),
+            "cthroll" | "cthRoll" => parse_cth_roll(&cmd_input),
-            "cthadv" | "ctharoll" => convert_to!(CthAdvanceRoll, cmd_input),
+            "cthadv" | "cthARoll" => parse_cth_advancement_roll(&cmd_input),
-            "help" => convert_to!(HelpCommand, cmd_input),
+            "chance" => chance_die(),
-            "register" => convert_to!(RegisterCommand, cmd_input),
+            "help" => help(&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.
@@ -239,9 +283,4 @@ mod tests {
         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.");
-    }
 }

src/commands/variables.rs

@@ -1,36 +1,20 @@
 use super::{Command, Execution, ExecutionResult};
 use crate::context::Context;
 use crate::db::errors::DataError;
-use crate::db::Variables;
+use crate::db::variables::UserAndRoom;
-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
+        let key = UserAndRoom(&ctx.username, &ctx.room_id().as_str());
-            .db
+        let variables = ctx.db.variables.get_user_variables(&key)?;
-            .get_user_variables(&ctx.username, ctx.active_room_id().as_str())
-            .await?;
 
         let mut variable_list: Vec<String> = variables
             .into_iter()
@@ -51,30 +35,16 @@ impl Command for GetAllVariablesCommand {
 
 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
+        let key = UserAndRoom(&ctx.username, &ctx.room_id().as_str());
-            .db
+        let result = ctx.db.variables.get_user_variable(&key, name);
-            .get_user_variable(&ctx.username, ctx.active_room_id().as_str(), name)
-            .await;
 
         let value = match result {
             Ok(num) => format!("{} = {}", name, num),
@@ -89,32 +59,18 @@ impl Command for GetVariableCommand {
 
 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;
+        let key = UserAndRoom(&ctx.username, ctx.room_id().as_str());
 
-        ctx.db
+        ctx.db.variables.set_user_variable(&key, name, value)?;
-            .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);
@@ -124,30 +80,16 @@ impl Command for SetVariableCommand {
 
 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
+        let key = UserAndRoom(&ctx.username, ctx.room_id().as_str());
-            .db
+        let result = ctx.db.variables.delete_user_variable(&key, name);
-            .delete_user_variable(&ctx.username, ctx.active_room_id().as_str(), name)
-            .await;
 
         let value = match result {
             Ok(()) => format!("{} now unset", name),

src/config.rs

@@ -4,6 +4,10 @@ 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}")]
@@ -49,19 +53,10 @@ fn db_path_from_env() -> String {
 }
 
 /// The "bot" section of the config file, for bot settings.
-#[derive(Serialize, Deserialize, Clone, Debug, Default)]
+#[derive(Serialize, Deserialize, Clone, Debug)]
 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.
@@ -89,18 +84,6 @@ 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
@@ -145,6 +128,15 @@ 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
@@ -158,18 +150,6 @@ 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)]
@@ -189,7 +169,6 @@ mod tests {
             }),
             bot: Some(BotConfig {
                 oldest_message_age: None,
-                ..Default::default()
             }),
         };
 

src/context.rs

@@ -0,0 +1,36 @@
+use crate::db::Database;
+use matrix_sdk::identifiers::RoomId;
+use matrix_sdk::room::Joined;
+use matrix_sdk::Client;
+
+/// 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: &'a Client,
+    pub room: RoomContext<'a>,
+    pub username: &'a str,
+    pub message_body: &'a str,
+}
+
+impl Context<'_> {
+    pub fn room_id(&self) -> &RoomId {
+        self.room.id
+    }
+}
+
+#[derive(Clone)]
+pub struct RoomContext<'a> {
+    pub id: &'a RoomId,
+    pub display_name: &'a str,
+}
+
+impl RoomContext<'_> {
+    pub fn new_with_name<'a>(room: &'a Joined, display_name: &'a str) -> RoomContext<'a> {
+        RoomContext {
+            id: room.room_id(),
+            display_name,
+        }
+    }
+}

src/cthulhu/dice.rs

@@ -1,18 +1,14 @@
 use crate::context::Context;
-use crate::db::Variables;
+use crate::dice::calculate_dice_amount;
 use crate::error::{BotError, DiceRollingError};
-use crate::logic::calculate_single_die_amount;
+use crate::parser::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, Debug, PartialEq)]
 pub struct DiceRoll {
-    pub amount: Amount,
+    pub amounts: Vec<Amount>,
     pub modifier: DiceRollModifier,
 }
 
@@ -192,7 +188,7 @@ impl fmt::Display for RolledDice {
 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: Amount,
+    pub existing_skill: Vec<Amount>,
 }
 
 impl fmt::Display for AdvancementRoll {
@@ -255,30 +251,14 @@ 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;
 }
 
-/// Macro to determine if an Amount is a variable.
+///A version of DieRoller that uses a rand::Rng to roll numbers.
-macro_rules! is_variable {
+struct RngDieRoller<R: rand::Rng>(R);
-    ($existing_skill:ident) => {
-        matches!(
-            $existing_skill,
-            Amount {
-                element: Element::Variable(_),
-                ..
-            }
-        );
-    };
-}
 
-/// A die roller than can have an RNG implementation injected, but
+impl<R: rand::Rng> DieRoller for RngDieRoller<R> {
-/// 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..=9)
     }
@@ -363,77 +343,45 @@ fn roll_advancement_dice<R: DieRoller>(target: u32, roller: &mut R) -> RolledAdv
 pub async fn regular_roll(
     roll_with_ctx: &DiceRollWithContext<'_>,
 ) -> Result<ExecutedDiceRoll, BotError> {
-    let target = calculate_single_die_amount(&roll_with_ctx.0.amount, roll_with_ctx.1).await?;
+    let target = calculate_dice_amount(&roll_with_ctx.0.amounts, roll_with_ctx.1).await?;
     let target = u32::try_from(target).map_err(|_| DiceRollingError::InvalidAmount)?;
 
-    let mut roller = RngDieRoller::<StdRng>(SeedableRng::from_entropy());
+    let mut roller = RngDieRoller(rand::thread_rng());
     let rolled_dice = roll_regular_dice(&roll_with_ctx.0.modifier, target, &mut roller);
 
     Ok(ExecutedDiceRoll {
-        target,
+        target: target,
         modifier: roll_with_ctx.0.modifier,
         roll: rolled_dice,
     })
 }
 
-async fn update_skill(ctx: &Context<'_>, variable: &str, value: u32) -> Result<(), BotError> {
-    use std::convert::TryInto;
-    let value: i32 = value.try_into()?;
-    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_dice_amount(&roll_with_ctx.0.existing_skill, roll_with_ctx.1).await?;
-    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 mut roller = RngDieRoller(rand::thread_rng());
     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::db::Database;
-    use crate::parser::dice::{Amount, Element, Operator};
+    use crate::parser::{Amount, Element, Operator};
-    use url::Url;
 
     macro_rules! dummy_room {
         () => {
             crate::context::RoomContext {
                 id: &matrix_sdk::identifiers::room_id!("!fakeroomid:example.com"),
-                display_name: "displayname".to_owned(),
+                display_name: "displayname",
-                secure: false,
             }
         };
     }
@@ -464,56 +412,21 @@ mod tests {
         }
     }
 
-    #[test]
+    #[tokio::test]
-    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 {
-            amount: Amount {
+            amounts: vec![Amount {
                 operator: Operator::Plus,
                 element: Element::Number(-10),
-            },
+            }],
             modifier: DiceRollModifier::Normal,
         };
 
-        let db_path = tempfile::NamedTempFile::new_in(".").unwrap();
+        let db = Database::new_temp().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).unwrap(),
+            matrix_client: &matrix_sdk::Client::new("https://example.com").unwrap(),
-            origin_room: dummy_room!(),
+            room: dummy_room!(),
-            active_room: dummy_room!(),
             username: "username",
             message_body: "message",
         };
@@ -527,31 +440,20 @@ mod tests {
         ));
     }
 
-    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
+    #[tokio::test]
     async fn advancement_roll_rejects_negative_numbers() {
         let roll = AdvancementRoll {
-            existing_skill: Amount {
+            existing_skill: vec![Amount {
                 operator: Operator::Plus,
                 element: Element::Number(-10),
-            },
+            }],
         };
 
-        let db_path = tempfile::NamedTempFile::new_in(".").unwrap();
+        let db = Database::new_temp().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).unwrap(),
+            matrix_client: &matrix_sdk::Client::new("https://example.com").unwrap(),
-            origin_room: dummy_room!(),
+            room: dummy_room!(),
-            active_room: dummy_room!(),
             username: "username",
             message_body: "message",
         };
@@ -565,31 +467,20 @@ mod tests {
         ));
     }
 
-    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
+    #[tokio::test]
     async fn advancement_roll_rejects_big_numbers() {
         let roll = AdvancementRoll {
-            existing_skill: Amount {
+            existing_skill: vec![Amount {
                 operator: Operator::Plus,
                 element: Element::Number(3000),
-            },
+            }],
         };
 
-        let db_path = tempfile::NamedTempFile::new_in(".").unwrap();
+        let db = Database::new_temp().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).unwrap(),
+            matrix_client: &matrix_sdk::Client::new("https://example.com").unwrap(),
-            origin_room: dummy_room!(),
+            room: dummy_room!(),
-            active_room: dummy_room!(),
             username: "username",
             message_body: "message",
         };
@@ -603,26 +494,6 @@ mod tests {
         ));
     }
 
-    #[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.

src/cthulhu/parser.rs

@@ -1,5 +1,5 @@
 use super::dice::{AdvancementRoll, DiceRoll, DiceRollModifier};
-use crate::parser::dice::DiceParsingError;
+use crate::parser::DiceParsingError;
 
 //TOOD convert these to use parse_amounts from the common dice code.
 
@@ -20,6 +20,7 @@ fn parse_modifier(input: &str) -> Result<DiceRollModifier, DiceParsingError> {
 //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 input: Vec<&str> = input.trim().split(":").collect();
 
@@ -30,13 +31,14 @@ pub fn parse_regular_roll(input: &str) -> Result<DiceRoll, DiceParsingError> {
     }?;
 
     let modifier = parse_modifier(modifiers_str)?;
-    let amount = crate::parser::dice::parse_single_amount(amounts_str)?;
+    let amounts = crate::parser::parse_amounts(amounts_str)?;
-    Ok(DiceRoll { modifier, amount })
+
+    Ok(DiceRoll { modifier, amounts })
 }
 
 pub fn parse_advancement_roll(input: &str) -> Result<AdvancementRoll, DiceParsingError> {
     let input = input.trim();
-    let amounts = crate::parser::dice::parse_single_amount(input)?;
+    let amounts = crate::parser::parse_amounts(input)?;
 
     Ok(AdvancementRoll {
         existing_skill: amounts,
@@ -45,8 +47,9 @@ pub fn parse_advancement_roll(input: &str) -> Result<AdvancementRoll, DiceParsin
 
 #[cfg(test)]
 mod tests {
+
     use super::*;
-    use crate::parser::dice::{Amount, Element, Operator};
+    use crate::parser::{Amount, Element, Operator};
 
     #[test]
     fn regular_roll_accepts_single_number() {
@@ -54,32 +57,26 @@ mod tests {
         assert!(result.is_ok());
         assert_eq!(
             DiceRoll {
-                amount: Amount {
+                amounts: vec![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("bb:60");
         assert!(result.is_ok());
         assert_eq!(
             DiceRoll {
-                amount: Amount {
+                amounts: vec![Amount {
                     operator: Operator::Plus,
                     element: Element::Number(60)
-                },
+                }],
                 modifier: DiceRollModifier::TwoBonus
             },
             result.unwrap()
@@ -92,10 +89,10 @@ mod tests {
         assert!(result.is_ok());
         assert_eq!(
             DiceRoll {
-                amount: Amount {
+                amounts: vec![Amount {
                     operator: Operator::Plus,
                     element: Element::Number(60)
-                },
+                }],
                 modifier: DiceRollModifier::OneBonus
             },
             result.unwrap()
@@ -108,10 +105,10 @@ mod tests {
         assert!(result.is_ok());
         assert_eq!(
             DiceRoll {
-                amount: Amount {
+                amounts: vec![Amount {
                     operator: Operator::Plus,
                     element: Element::Number(60)
-                },
+                }],
                 modifier: DiceRollModifier::TwoPenalty
             },
             result.unwrap()
@@ -124,10 +121,10 @@ mod tests {
         assert!(result.is_ok());
         assert_eq!(
             DiceRoll {
-                amount: Amount {
+                amounts: vec![Amount {
                     operator: Operator::Plus,
                     element: Element::Number(60)
-                },
+                }],
                 modifier: DiceRollModifier::OnePenalty
             },
             result.unwrap()
@@ -135,7 +132,7 @@ mod tests {
     }
 
     #[test]
-    fn regular_roll_accepts_whitespace() {
+    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());
@@ -170,10 +167,10 @@ mod tests {
         assert!(result.is_ok());
         assert_eq!(
             AdvancementRoll {
-                existing_skill: Amount {
+                existing_skill: vec![Amount {
                     operator: Operator::Plus,
                     element: Element::Number(60)
-                }
+                }]
             },
             result.unwrap()
         );
@@ -190,18 +187,41 @@ mod tests {
         assert!(result.is_ok());
         assert_eq!(
             AdvancementRoll {
-                existing_skill: Amount {
+                existing_skill: vec![Amount {
                     operator: Operator::Plus,
                     element: Element::Variable(String::from("abc"))
-                }
+                }]
             },
             result.unwrap()
         );
     }
 
     #[test]
-    fn advancement_roll_rejects_complex_expressions() {
+    fn advancement_roll_allows_complex_expressions() {
         let result = parse_advancement_roll("3 + abc + bob - 4");
-        assert!(result.is_err());
+        assert!(result.is_ok());
+        assert_eq!(
+            AdvancementRoll {
+                existing_skill: vec![
+                    Amount {
+                        operator: Operator::Plus,
+                        element: Element::Number(3)
+                    },
+                    Amount {
+                        operator: Operator::Plus,
+                        element: Element::Variable(String::from("abc"))
+                    },
+                    Amount {
+                        operator: Operator::Plus,
+                        element: Element::Variable(String::from("bob"))
+                    },
+                    Amount {
+                        operator: Operator::Minus,
+                        element: Element::Number(4)
+                    }
+                ]
+            },
+            result.unwrap()
+        );
     }
 }

src/db.rs

@@ -0,0 +1,97 @@
+use crate::db::errors::{DataError, MigrationError};
+use crate::db::migrations::{get_migration_version, Migrations};
+use crate::db::rooms::Rooms;
+use crate::db::state::DbState;
+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 rooms;
+pub mod schema;
+pub mod state;
+pub mod variables;
+
+#[derive(Clone)]
+pub struct Database {
+    db: Db,
+    pub(crate) variables: Variables,
+    pub(crate) migrations: Migrations,
+    pub(crate) rooms: Rooms,
+    pub(crate) state: DbState,
+}
+
+impl Database {
+    fn new_db(db: sled::Db) -> Result<Database, DataError> {
+        let migrations = db.open_tree("migrations")?;
+
+        let database = Database {
+            db: db.clone(),
+            variables: Variables::new(&db)?,
+            migrations: Migrations(migrations),
+            rooms: Rooms::new(&db)?,
+            state: DbState::new(&db)?,
+        };
+
+        //Start any event handlers.
+        database.rooms.start_handler();
+
+        info!("Opened database.");
+        Ok(database)
+    }
+
+    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

@@ -0,0 +1,28 @@
+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

@@ -0,0 +1,78 @@
+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("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("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))
+            }
+        }
+    }
+}
+
+/// Automatically aborts transactions that hit a DataError by using
+/// the try (question mark) operator when this trait implementation is
+/// in scope.
+impl From<DataError> for sled::transaction::ConflictableTransactionError<DataError> {
+    fn from(error: DataError) -> Self {
+        sled::transaction::ConflictableTransactionError::Abort(error)
+    }
+}

src/db/migrations.rs

@@ -0,0 +1,54 @@
+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/rooms.rs

@@ -0,0 +1,515 @@
+use crate::db::errors::DataError;
+use crate::db::schema::convert_u64;
+use crate::models::RoomInfo;
+use byteorder::BigEndian;
+use log::{debug, error, log_enabled};
+use sled::transaction::TransactionalTree;
+use sled::Transactional;
+use sled::{CompareAndSwapError, Tree};
+use std::collections::HashSet;
+use std::str;
+use std::time::{SystemTime, UNIX_EPOCH};
+use tokio::task::JoinHandle;
+use zerocopy::byteorder::U64;
+use zerocopy::AsBytes;
+
+#[derive(Clone)]
+pub struct Rooms {
+    /// Room ID -> RoomInfo struct (single entries).
+    /// Key is just room ID as bytes.
+    pub(in crate::db) roomid_roominfo: Tree,
+
+    /// Room ID -> list of usernames in room.
+    pub(in crate::db) roomid_usernames: Tree,
+
+    /// Username -> list of room IDs user is in.
+    pub(in crate::db) username_roomids: Tree,
+
+    /// Room ID(str) 0xff event ID(str) -> timestamp. Records event
+    /// IDs that we have received, so we do not process twice.
+    pub(in crate::db) roomeventid_timestamp: Tree,
+
+    /// Room ID(str) 0xff timestamp(u64) -> event ID. Records event
+    /// IDs with timestamp as the primary key instead. Exists to allow
+    /// easy scanning of old roomeventid_timestamp records for
+    /// removal. Be careful with u64, it can have 0xff and 0xfe bytes.
+    /// A simple split on 0xff will not work with this key. Instead,
+    /// it is meant to be split on the first 0xff byte only, and
+    /// separated into room ID and timestamp.
+    pub(in crate::db) roomtimestamp_eventid: Tree,
+}
+
+/// An enum that can hold either a regular sled Tree, or a
+/// Transactional tree.
+#[derive(Clone, Copy)]
+enum TxableTree<'a> {
+    Tree(&'a Tree),
+    Tx(&'a TransactionalTree),
+}
+
+impl<'a> Into<TxableTree<'a>> for &'a Tree {
+    fn into(self) -> TxableTree<'a> {
+        TxableTree::Tree(self)
+    }
+}
+
+impl<'a> Into<TxableTree<'a>> for &'a TransactionalTree {
+    fn into(self) -> TxableTree<'a> {
+        TxableTree::Tx(self)
+    }
+}
+
+/// A set of functions that can be used with a sled::Tree that stores
+/// HashSets as its values. Atomicity is partially handled. If the
+/// Tree is a transactional tree, operations will be atomic.
+/// Otherwise, there is a potential non-atomic step.
+mod hashset_tree {
+    use super::*;
+
+    fn insert_set<'a, T: Into<TxableTree<'a>>>(
+        tree: T,
+        key: &[u8],
+        set: HashSet<String>,
+    ) -> Result<(), DataError> {
+        let serialized = bincode::serialize(&set)?;
+        match tree.into() {
+            TxableTree::Tree(tree) => tree.insert(key, serialized)?,
+            TxableTree::Tx(tx) => tx.insert(key, serialized)?,
+        };
+        Ok(())
+    }
+
+    pub(super) fn get_set<'a, T: Into<TxableTree<'a>>>(
+        tree: T,
+        key: &[u8],
+    ) -> Result<HashSet<String>, DataError> {
+        let set: HashSet<String> = match tree.into() {
+            TxableTree::Tree(tree) => tree.get(key)?,
+            TxableTree::Tx(tx) => tx.get(key)?,
+        }
+        .map(|bytes| bincode::deserialize::<HashSet<String>>(&bytes))
+        .unwrap_or(Ok(HashSet::new()))?;
+
+        Ok(set)
+    }
+
+    pub(super) fn remove_from_set<'a, T: Into<TxableTree<'a>> + Copy>(
+        tree: T,
+        key: &[u8],
+        value_to_remove: &str,
+    ) -> Result<(), DataError> {
+        let mut set = get_set(tree, key)?;
+        set.remove(value_to_remove);
+        insert_set(tree, key, set)?;
+        Ok(())
+    }
+
+    pub(super) fn add_to_set<'a, T: Into<TxableTree<'a>> + Copy>(
+        tree: T,
+        key: &[u8],
+        value_to_add: String,
+    ) -> Result<(), DataError> {
+        let mut set = get_set(tree, key)?;
+        set.insert(value_to_add);
+        insert_set(tree, key, set)?;
+        Ok(())
+    }
+}
+
+/// Functions that specifically relate to the "timestamp index" tree,
+/// which is stored on the Rooms instance as a tree called
+/// roomtimestamp_eventid. Tightly coupled to the event watcher in the
+/// Rooms impl, and only factored out for unit testing.
+mod timestamp_index {
+    use super::*;
+
+    /// Insert an entry from the main roomeventid_timestamp Tree into
+    /// the timestamp index. Keys in this Tree are stored as room ID
+    /// 0xff timestamp, with the value being a hashset of event IDs
+    /// received at the time. The parameters come from an insert to
+    /// that Tree, where the key is room ID 0xff event ID, and the
+    /// value is the timestamp.
+    pub(super) fn insert(
+        roomtimestamp_eventid: &Tree,
+        key: &[u8],
+        timestamp_bytes: &[u8],
+    ) -> Result<(), DataError> {
+        let parts: Vec<&[u8]> = key.split(|&b| b == 0xff).collect();
+        if let [room_id, event_id] = parts[..] {
+            let mut ts_key = room_id.to_vec();
+            ts_key.push(0xff);
+            ts_key.extend_from_slice(&timestamp_bytes);
+            log_index_record(room_id, event_id, &timestamp_bytes);
+
+            let event_id = str::from_utf8(event_id)?;
+            hashset_tree::add_to_set(roomtimestamp_eventid, &ts_key, event_id.to_owned())?;
+            Ok(())
+        } else {
+            Err(DataError::InvalidValue)
+        }
+    }
+
+    /// Log a debug message.
+    fn log_index_record(room_id: &[u8], event_id: &[u8], timestamp: &[u8]) {
+        if log_enabled!(log::Level::Debug) {
+            debug!(
+                "Recording event {} | {} received at {} in timestamp index.",
+                str::from_utf8(room_id).unwrap_or("[invalid room id]"),
+                str::from_utf8(event_id).unwrap_or("[invalid event id]"),
+                convert_u64(timestamp).unwrap_or(0)
+            );
+        }
+    }
+}
+
+impl Rooms {
+    pub(in crate::db) fn new(db: &sled::Db) -> Result<Rooms, sled::Error> {
+        Ok(Rooms {
+            roomid_roominfo: db.open_tree("roomid_roominfo")?,
+            roomid_usernames: db.open_tree("roomid_usernames")?,
+            username_roomids: db.open_tree("username_roomids")?,
+            roomeventid_timestamp: db.open_tree("roomeventid_timestamp")?,
+            roomtimestamp_eventid: db.open_tree("roomtimestamp_eventid")?,
+        })
+    }
+
+    /// Start an event subscriber that listens for inserts made by the
+    /// `should_process` function. This event handler duplicates the
+    /// entry by timestamp instead of event ID.
+    pub(in crate::db) fn start_handler(&self) -> JoinHandle<()> {
+        //Clone due to lifetime requirements.
+        let roomeventid_timestamp = self.roomeventid_timestamp.clone();
+        let roomtimestamp_eventid = self.roomtimestamp_eventid.clone();
+
+        tokio::spawn(async move {
+            let mut subscriber = roomeventid_timestamp.watch_prefix(b"");
+
+            // TODO make this handler receive kill messages somehow so
+            // we can unit test it and gracefully shut it down.
+            while let Some(event) = (&mut subscriber).await {
+                if let sled::Event::Insert { key, value } = event {
+                    match timestamp_index::insert(&roomtimestamp_eventid, &key, &value) {
+                        Err(e) => {
+                            error!("Unable to update the timestamp index: {}", e);
+                        }
+                        _ => (),
+                    }
+                }
+            }
+        })
+    }
+
+    /// Determine if an event in a room should be processed. The event
+    /// is atomically recorded and true returned if the database has
+    /// not seen tis event yet. If the event already exists in the
+    /// database, the function returns false. Events are recorded by
+    /// this function by inserting the (system-local) timestamp in
+    /// epoch seconds.
+    pub fn should_process(&self, room_id: &str, event_id: &str) -> Result<bool, DataError> {
+        let mut key = room_id.as_bytes().to_vec();
+        key.push(0xff);
+        key.extend_from_slice(event_id.as_bytes());
+
+        let timestamp: U64<BigEndian> = U64::new(
+            SystemTime::now()
+                .duration_since(UNIX_EPOCH)
+                .expect("Clock has gone backwards")
+                .as_secs(),
+        );
+
+        match self.roomeventid_timestamp.compare_and_swap(
+            key,
+            None as Option<&[u8]>,
+            Some(timestamp.as_bytes()),
+        )? {
+            Ok(()) => Ok(true),
+            Err(CompareAndSwapError { .. }) => Ok(false),
+        }
+    }
+
+    pub fn insert_room_info(&self, info: &RoomInfo) -> Result<(), DataError> {
+        let key = info.room_id.as_bytes();
+        let serialized = bincode::serialize(&info)?;
+        self.roomid_roominfo.insert(key, serialized)?;
+        Ok(())
+    }
+
+    pub fn get_room_info(&self, room_id: &str) -> Result<Option<RoomInfo>, DataError> {
+        let key = room_id.as_bytes();
+
+        let room_info: Option<RoomInfo> = self
+            .roomid_roominfo
+            .get(key)?
+            .map(|bytes| bincode::deserialize(&bytes))
+            .transpose()?;
+
+        Ok(room_info)
+    }
+
+    pub fn get_rooms_for_user(&self, username: &str) -> Result<HashSet<String>, DataError> {
+        hashset_tree::get_set(&self.username_roomids, username.as_bytes())
+    }
+
+    pub fn get_users_in_room(&self, room_id: &str) -> Result<HashSet<String>, DataError> {
+        hashset_tree::get_set(&self.roomid_usernames, room_id.as_bytes())
+    }
+
+    pub fn add_user_to_room(&self, username: &str, room_id: &str) -> Result<(), DataError> {
+        debug!("Adding user {} to room {}", username, room_id);
+        (&self.username_roomids, &self.roomid_usernames).transaction(
+            |(tx_username_rooms, tx_room_usernames)| {
+                let username_key = &username.as_bytes();
+                hashset_tree::add_to_set(tx_username_rooms, username_key, room_id.to_owned())?;
+
+                let roomid_key = &room_id.as_bytes();
+                hashset_tree::add_to_set(tx_room_usernames, roomid_key, username.to_owned())?;
+
+                Ok(())
+            },
+        )?;
+
+        Ok(())
+    }
+
+    pub fn remove_user_from_room(&self, username: &str, room_id: &str) -> Result<(), DataError> {
+        debug!("Removing user {} from room {}", username, room_id);
+        (&self.username_roomids, &self.roomid_usernames).transaction(
+            |(tx_username_rooms, tx_room_usernames)| {
+                let username_key = &username.as_bytes();
+                hashset_tree::remove_from_set(tx_username_rooms, username_key, room_id)?;
+
+                let roomid_key = &room_id.as_bytes();
+                hashset_tree::remove_from_set(tx_room_usernames, roomid_key, username)?;
+
+                Ok(())
+            },
+        )?;
+
+        Ok(())
+    }
+
+    pub fn clear_info(&self, room_id: &str) -> Result<(), DataError> {
+        debug!("Clearing all information for room {}", room_id);
+        (&self.username_roomids, &self.roomid_usernames).transaction(
+            |(tx_username_roomids, tx_roomid_usernames)| {
+                let roomid_key = room_id.as_bytes();
+                let users_in_room = hashset_tree::get_set(tx_roomid_usernames, roomid_key)?;
+
+                //Remove the room ID from every user's room ID list.
+                for username in users_in_room {
+                    hashset_tree::remove_from_set(
+                        tx_username_roomids,
+                        username.as_bytes(),
+                        room_id,
+                    )?;
+                }
+
+                //Remove this room entry for the room ID -> username tree.
+                tx_roomid_usernames.remove(roomid_key)?;
+
+                //TODO: delete roominfo struct from room info tree.
+                Ok(())
+            },
+        )?;
+
+        Ok(())
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use sled::Config;
+
+    fn create_test_instance() -> Rooms {
+        let config = Config::new().temporary(true);
+        let db = config.open().unwrap();
+        Rooms::new(&db).unwrap()
+    }
+
+    #[test]
+    fn add_user_to_room() {
+        let rooms = create_test_instance();
+
+        rooms
+            .add_user_to_room("testuser", "myroom")
+            .expect("Could not add user to room");
+
+        let users_in_room = rooms
+            .get_users_in_room("myroom")
+            .expect("Could not retrieve users in room");
+
+        let rooms_for_user = rooms
+            .get_rooms_for_user("testuser")
+            .expect("Could not get rooms for user");
+
+        let expected_users_in_room: HashSet<String> =
+            vec![String::from("testuser")].into_iter().collect();
+
+        let expected_rooms_for_user: HashSet<String> =
+            vec![String::from("myroom")].into_iter().collect();
+
+        assert_eq!(expected_users_in_room, users_in_room);
+        assert_eq!(expected_rooms_for_user, rooms_for_user);
+    }
+
+    #[test]
+    fn remove_user_from_room() {
+        let rooms = create_test_instance();
+
+        rooms
+            .add_user_to_room("testuser", "myroom")
+            .expect("Could not add user to room");
+
+        rooms
+            .remove_user_from_room("testuser", "myroom")
+            .expect("Could not remove user from room");
+
+        let users_in_room = rooms
+            .get_users_in_room("myroom")
+            .expect("Could not retrieve users in room");
+
+        let rooms_for_user = rooms
+            .get_rooms_for_user("testuser")
+            .expect("Could not get rooms for user");
+
+        assert_eq!(HashSet::new(), users_in_room);
+        assert_eq!(HashSet::new(), rooms_for_user);
+    }
+
+    #[test]
+    fn insert_room_info_works() {
+        let rooms = create_test_instance();
+
+        let info = RoomInfo {
+            room_id: matrix_sdk::identifiers::room_id!("!fakeroom:example.com")
+                .as_str()
+                .to_owned(),
+            room_name: "fake room name".to_owned(),
+        };
+
+        rooms
+            .insert_room_info(&info)
+            .expect("Could insert room info");
+
+        let found_info = rooms
+            .get_room_info("!fakeroom:example.com")
+            .expect("Error loading room info");
+
+        assert!(found_info.is_some());
+        assert_eq!(info, found_info.unwrap());
+    }
+
+    #[test]
+    fn insert_room_info_updates_data() {
+        let rooms = create_test_instance();
+
+        let mut info = RoomInfo {
+            room_id: matrix_sdk::identifiers::room_id!("!fakeroom:example.com")
+                .as_str()
+                .to_owned(),
+            room_name: "fake room name".to_owned(),
+        };
+
+        rooms
+            .insert_room_info(&info)
+            .expect("Could insert room info");
+
+        //Update info to have a new room name before inserting again.
+        info.room_name = "new fake room name".to_owned();
+
+        rooms
+            .insert_room_info(&info)
+            .expect("Could insert room info");
+
+        let found_info = rooms
+            .get_room_info("!fakeroom:example.com")
+            .expect("Error loading room info");
+
+        assert!(found_info.is_some());
+        assert_eq!(info, found_info.unwrap());
+    }
+
+    #[test]
+    fn get_room_info_none_when_room_does_not_exist() {
+        let rooms = create_test_instance();
+
+        let found_info = rooms
+            .get_room_info("!fakeroom:example.com")
+            .expect("Error loading room info");
+
+        assert!(found_info.is_none());
+    }
+
+    #[test]
+    fn clear_info_modifies_removes_requested_room() {
+        let rooms = create_test_instance();
+
+        rooms
+            .add_user_to_room("testuser", "myroom1")
+            .expect("Could not add user to room1");
+
+        rooms
+            .add_user_to_room("testuser", "myroom2")
+            .expect("Could not add user to room2");
+
+        rooms
+            .clear_info("myroom1")
+            .expect("Could not clear room info");
+
+        let users_in_room1 = rooms
+            .get_users_in_room("myroom1")
+            .expect("Could not retrieve users in room1");
+
+        let users_in_room2 = rooms
+            .get_users_in_room("myroom2")
+            .expect("Could not retrieve users in room2");
+
+        let rooms_for_user = rooms
+            .get_rooms_for_user("testuser")
+            .expect("Could not get rooms for user");
+
+        let expected_users_in_room2: HashSet<String> =
+            vec![String::from("testuser")].into_iter().collect();
+
+        let expected_rooms_for_user: HashSet<String> =
+            vec![String::from("myroom2")].into_iter().collect();
+
+        assert_eq!(HashSet::new(), users_in_room1);
+        assert_eq!(expected_users_in_room2, users_in_room2);
+        assert_eq!(expected_rooms_for_user, rooms_for_user);
+    }
+
+    #[test]
+    fn insert_to_timestamp_index() {
+        let rooms = create_test_instance();
+
+        // Insertion into timestamp index based on data that would go
+        // into main room x eventID -> timestamp tree.
+        let mut key = b"myroom".to_vec();
+        key.push(0xff);
+        key.extend_from_slice(b"myeventid");
+
+        let timestamp: U64<BigEndian> = U64::new(1000);
+
+        let result = timestamp_index::insert(
+            &rooms.roomtimestamp_eventid,
+            key.as_bytes(),
+            timestamp.as_bytes(),
+        );
+
+        assert!(result.is_ok());
+
+        // Retrieval of data from the timestamp index tree.
+        let mut ts_key = b"myroom".to_vec();
+        ts_key.push(0xff);
+        ts_key.extend_from_slice(timestamp.as_bytes());
+
+        let expected_events: HashSet<String> =
+            vec![String::from("myeventid")].into_iter().collect();
+
+        let event_ids = hashset_tree::get_set(&rooms.roomtimestamp_eventid, &ts_key)
+            .expect("Could not get set out of Tree");
+        assert_eq!(expected_events, event_ids);
+    }
+}

src/db/schema.rs

@@ -0,0 +1,52 @@
+use crate::db::errors::DataError;
+use byteorder::{BigEndian, LittleEndian};
+use zerocopy::byteorder::{I32, U32, U64};
+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>>;
+
+#[allow(dead_code)]
+type LittleEndianU64Layout<'a> = LayoutVerified<&'a [u8], U64<LittleEndian>>;
+
+type BigEndianU64Layout<'a> = LayoutVerified<&'a [u8], U64<BigEndian>>;
+
+/// 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)
+    }
+}
+
+#[allow(dead_code)]
+pub(super) fn convert_u64(raw_value: &[u8]) -> Result<u64, DataError> {
+    let layout = BigEndianU64Layout::new_unaligned(raw_value.as_ref());
+
+    if let Some(layout) = layout {
+        let value: U64<BigEndian> = *layout;
+        Ok(value.get())
+    } else {
+        Err(DataError::I32SchemaViolation)
+    }
+}

src/db/state.rs

@@ -0,0 +1,88 @@
+use crate::db::errors::DataError;
+use sled::Tree;
+
+#[derive(Clone)]
+pub struct DbState {
+    /// Tree of simple key-values for global state values that persist
+    /// between restarts (e.g. device ID).
+    pub(in crate::db) global_metadata: Tree,
+}
+
+const DEVICE_ID_KEY: &'static [u8] = b"device_id";
+
+impl DbState {
+    pub(in crate::db) fn new(db: &sled::Db) -> Result<DbState, sled::Error> {
+        Ok(DbState {
+            global_metadata: db.open_tree("global_metadata")?,
+        })
+    }
+
+    pub fn get_device_id(&self) -> Result<Option<String>, DataError> {
+        self.global_metadata
+            .get(DEVICE_ID_KEY)?
+            .map(|v| String::from_utf8(v.to_vec()))
+            .transpose()
+            .map_err(|e| e.into())
+    }
+
+    pub fn set_device_id(&self, device_id: &str) -> Result<(), DataError> {
+        self.global_metadata
+            .insert(DEVICE_ID_KEY, device_id.as_bytes())?;
+
+        Ok(())
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use sled::Config;
+
+    fn create_test_instance() -> DbState {
+        let config = Config::new().temporary(true);
+        let db = config.open().unwrap();
+        DbState::new(&db).unwrap()
+    }
+
+    #[test]
+    fn set_device_id_works() {
+        let state = create_test_instance();
+        let result = state.set_device_id("test-device");
+        assert!(result.is_ok());
+    }
+
+    #[test]
+    fn set_device_id_can_overwrite() {
+        let state = create_test_instance();
+        state.set_device_id("test-device").expect("insert 1 failed");
+        let result = state.set_device_id("test-device2");
+        assert!(result.is_ok());
+    }
+
+    #[test]
+    fn get_device_id_returns_some_when_set() {
+        let state = create_test_instance();
+
+        state
+            .set_device_id("test-device")
+            .expect("could not store device id properly");
+
+        let device_id = state.get_device_id();
+
+        assert!(device_id.is_ok());
+
+        let device_id = device_id.unwrap();
+        assert!(device_id.is_some());
+        assert_eq!("test-device", device_id.unwrap());
+    }
+
+    #[test]
+    fn get_device_id_returns_none_when_unset() {
+        let state = create_test_instance();
+        let device_id = state.get_device_id();
+        assert!(device_id.is_ok());
+
+        let device_id = device_id.unwrap();
+        assert!(device_id.is_none());
+    }
+}

src/db/variables.rs

@@ -0,0 +1,371 @@
+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 something 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<(String, i32)>, 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 tuples to hash map with 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());
+
+                if let Some(_) = tx_vars.remove(key)? {
+                    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

@@ -0,0 +1,354 @@
+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.rs

@@ -0,0 +1,32 @@
+use crate::context::Context;
+use crate::db::variables::UserAndRoom;
+use crate::error::BotError;
+use crate::error::DiceRollingError;
+use crate::parser::Amount;
+use crate::parser::Element as NewElement;
+use futures::stream::{self, StreamExt, TryStreamExt};
+
+/// 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 key = UserAndRoom(&ctx.username, ctx.room_id().as_str());
+    let variables = &ctx.db.variables.get_user_variables(&key)?;
+
+    use DiceRollingError::VariableNotFound;
+    let dice_amount: i32 = stream
+        .then(|amount| async move {
+            match &amount.element {
+                NewElement::Number(num_dice) => Ok(num_dice * amount.operator.mult()),
+                NewElement::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)
+}

src/error.rs

@@ -1,10 +1,7 @@
-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 {
@@ -36,10 +33,10 @@ pub enum BotError {
     #[error("error in matrix state store: {0}")]
     MatrixStateStoreError(#[from] matrix_sdk::StoreError),
 
-    #[error("uncategorized matrix SDK error: {0}")]
+    #[error("uncategorized matrix SDK error")]
     MatrixError(#[from] matrix_sdk::Error),
 
-    #[error("uncategorized matrix SDK base error: {0}")]
+    #[error("uncategorized matrix SDK base error")]
     MatrixBaseError(#[from] matrix_sdk::BaseError),
 
     #[error("future canceled")]
@@ -53,7 +50,7 @@ pub enum BotError {
     IoError(#[from] std::io::Error),
 
     #[error("dice parsing error: {0}")]
-    DiceParsingError(#[from] crate::parser::dice::DiceParsingError),
+    DiceParsingError(#[from] crate::parser::DiceParsingError),
 
     #[error("command parsing error: {0}")]
     CommandParsingError(#[from] crate::commands::parser::CommandParsingError),
@@ -62,7 +59,7 @@ pub enum BotError {
     DiceRollingError(#[from] DiceRollingError),
 
     #[error("variable parsing error: {0}")]
-    VariableParsingError(#[from] crate::parser::variables::VariableParsingError),
+    VariableParsingError(#[from] crate::variables::VariableParsingError),
 
     #[error("legacy parsing error")]
     NomParserError(nom::error::ErrorKind),
@@ -73,38 +70,11 @@ pub enum BotError {
     #[error("variables not yet supported")]
     VariablesNotSupported,
 
+    #[error("database error")]
+    DatabaseError(#[from] sled::Error),
+
     #[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::identifiers::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)]

src/help.rs

@@ -5,7 +5,6 @@ pub fn parse_help_topic(input: &str) -> Option<HelpTopic> {
         "cofd" => Some(HelpTopic::ChroniclesOfDarkness),
         "dicepool" => Some(HelpTopic::DicePool),
         "dice" => Some(HelpTopic::RollingDice),
-        "cthulhu" => Some(HelpTopic::Cthulhu),
         "" => Some(HelpTopic::General),
         _ => None,
     }
@@ -14,7 +13,6 @@ pub fn parse_help_topic(input: &str) -> Option<HelpTopic> {
 pub enum HelpTopic {
     ChroniclesOfDarkness,
     DicePool,
-    Cthulhu,
     RollingDice,
     General,
 }
@@ -53,11 +51,9 @@ Rolling dice pools
 
 Command: !pool, !rp
 
-Syntax: !pool <modifiers>:<expression>
+Syntax: !pool <modifiers>:<num>
 
-Short syntax: !pool <expression>
+Short syntax: !pool <num>
-
-Expression Syntax: <num|variable> [+/- <expression> ...]
 
 Modifiers:
  n = nine-again
@@ -70,35 +66,6 @@ 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 GENERAL_HELP: &'static str = indoc! {"
@@ -107,7 +74,6 @@ General Help
 Try these help commands:
   !help cofd
   !help dice
-  !help cthulhu
 "};
 
 impl HelpTopic {
@@ -115,7 +81,6 @@ impl HelpTopic {
         match self {
             HelpTopic::ChroniclesOfDarkness => COFD_HELP,
             HelpTopic::DicePool => DICEPOOL_HELP,
-            HelpTopic::Cthulhu => CTHULHU_HELP,
             HelpTopic::RollingDice => DICE_HELP,
             HelpTopic::General => GENERAL_HELP,
         }

src/lib.rs

@@ -6,11 +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 rpc;
 pub mod state;
+pub mod variables;

src/logic.rs

@@ -0,0 +1,31 @@
+use crate::db::errors::DataError;
+use crate::matrix;
+use crate::models::RoomInfo;
+use matrix_sdk::{self, identifiers::RoomId, Client};
+
+/// Record the information about a room, including users in it.
+pub async fn record_room_information(
+    client: &Client,
+    db: &crate::db::Database,
+    room_id: &RoomId,
+    room_display_name: &str,
+    our_username: &str,
+) -> Result<(), DataError> {
+    let room_id_str = room_id.as_str();
+    let usernames = matrix::get_users_in_room(&client, &room_id).await;
+
+    let info = RoomInfo {
+        room_id: room_id_str.to_owned(),
+        room_name: room_display_name.to_owned(),
+    };
+
+    // TODO this and the username adding should be one whole
+    // transaction in the db.
+    db.rooms.insert_room_info(&info)?;
+
+    usernames
+        .into_iter()
+        .filter(|username| username != our_username)
+        .map(|username| db.rooms.add_user_to_room(&username, room_id_str))
+        .collect() //Make use of collect impl on Result.
+}

src/matrix.rs

@@ -0,0 +1,64 @@
+use log::error;
+use matrix_sdk::{events::room::message::NoticeMessageEventContent, RoomMember};
+use matrix_sdk::{
+    events::room::message::{InReplyTo, Relation},
+    events::room::message::{MessageEventContent, MessageType},
+    events::AnyMessageEventContent,
+    identifiers::EventId,
+    Error as MatrixError,
+};
+use matrix_sdk::{identifiers::RoomId, Client};
+
+/// 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::FromHttpResponse(ruma_err)) = error {
+        ruma_err.to_string()
+    } else {
+        error.to_string()
+    }
+}
+
+/// Retrieve a list of users in a given room.
+pub async fn get_users_in_room(client: &Client, room_id: &RoomId) -> Vec<String> {
+    if let Some(joined_room) = client.get_joined_room(room_id) {
+        let members: Vec<RoomMember> = joined_room.joined_members().await.ok().unwrap_or_default();
+
+        members
+            .into_iter()
+            .map(|member| member.user_id().to_string())
+            .collect()
+    } else {
+        vec![]
+    }
+}
+
+pub async fn send_message(
+    client: &Client,
+    room_id: &RoomId,
+    message: &str,
+    reply_to: Option<EventId>,
+) {
+    let room = match client.get_joined_room(room_id) {
+        Some(room) => room,
+        _ => return,
+    };
+
+    let plain = html2text::from_read(message.as_bytes(), message.len());
+    let mut content = MessageEventContent::new(MessageType::Notice(
+        NoticeMessageEventContent::html(plain.trim(), message),
+    ));
+
+    content.relates_to = reply_to.map(|event_id| Relation::Reply {
+        in_reply_to: InReplyTo { event_id },
+    });
+
+    let content = AnyMessageEventContent::RoomMessage(content);
+
+    let result = room.send(content, None).await;
+
+    if let Err(e) = result {
+        let message = extract_error_message(e);
+        error!("Error sending message: {}", message);
+    };
+}

src/models.rs

@@ -0,0 +1,8 @@
+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,
+}

src/parser.rs

@@ -21,13 +21,10 @@ pub enum DiceParsingError {
 
     #[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 {
+    fn from(_error: std::num::ParseIntError) -> Self {
         DiceParsingError::ConversionError
     }
 }
@@ -36,7 +33,7 @@ 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)]
+#[derive(Debug, PartialEq, Eq, Clone)]
 pub enum Operator {
     Plus,
     Minus,
@@ -151,7 +148,10 @@ where
 /// 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.
+/// 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) -> ParseResult<Vec<Amount>> {
     let input = input.trim();
 
@@ -177,84 +177,9 @@ pub fn parse_amounts(input: &str) -> ParseResult<Vec<Amount>> {
     }
 }
 
-/// 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.
-pub fn parse_single_amount(input: &str) -> ParseResult<Amount> {
-    // 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)?;
-
-    if rest.len() == 0 {
-        result
-    } else {
-        Err(DiceParsingError::UnconsumedInput)
-    }
-}
-
 #[cfg(test)]
-mod parse_single_amount_tests {
+mod 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)
-            }
-        )
-    }
-
-    #[test]
-    fn parse_multiple_elements_test() {
-        let result = parse_single_amount("1+abc");
-        assert!(result.is_err());
-
-        let result = parse_single_amount("abc+1");
-        assert!(result.is_err());
-
-        let result = parse_single_amount("-1-abc");
-        assert!(result.is_err());
-    }
-}
-
-#[cfg(test)]
-mod parse_many_amounts_tests {
     use super::*;
 
     #[test]