Do not process commands coming from ourselves (help text)

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

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

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

.drone.yml

@@ -3,18 +3,20 @@ name: build-and-test
 
 steps:
 - name: test
-  image: rust:1.51
+  image: rust:1.80
   commands:
   - apt-get update
   - apt-get install -y cmake
+  - rustup component add rustfmt
   - cargo build --verbose --all
   - cargo test --verbose --all
 
 - name: docker
   image: plugins/docker
   when:
-    branch:
-    - master
+    ref:
+    - refs/tags/v*
+    - refs/heads/master
   settings:
     auto_tag: true
     username:

Cargo.toml

@@ -1,46 +1,6 @@
-[package]
-name = "tenebrous-dicebot"
-version = "0.10.0"
-authors = ["Taylor C. Richberger <taywee@gmx.com>", "projectmoon <projectmoon@agnos.is>"]
-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"]
+[workspace]
 
-[dependencies]
-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 = { git = "https://github.com/matrix-org/matrix-rust-sdk", branch = "master" }
-refinery = { version = "0.5", features = ["rusqlite"]}
-barrel = { version = "0.6", features = ["sqlite3"] }
-tempfile = "3"
-substring = "1.4"
-
-[dependencies.sqlx]
-version = "0.5"
-features = [ "offline", "sqlite", "runtime-tokio-native-tls" ]
-
-[dependencies.serde]
-version = "1"
-features = ['derive']
-
-[dependencies.tokio]
-version = "1"
-features = [ "full" ]
+members = [
+    "dicebot",
+    "rpc"
+]

Dockerfile

@@ -1,16 +1,15 @@
 # Builder image with development dependencies.
-FROM bougyman/voidlinux:glibc as builder
+FROM ghcr.io/void-linux/void-linux:latest-mini-x86_64 as builder
+RUN xbps-install -S
+RUN xbps-install -yu xbps
 RUN xbps-install -Syu
-RUN xbps-install -Sy base-devel rustup cargo cmake wget gnupg
+RUN xbps-install -Sy base-devel rustup 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://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
@@ -20,7 +19,10 @@ ADD . ./
 RUN . /root/.cargo/env && cargo build --release
 
 # Final image
-FROM bougyman/voidlinux:tiny
+FROM ghcr.io/void-linux/void-linux:latest-mini-x86_64
+RUN xbps-install -S
+RUN xbps-install -yu xbps
+RUN xbps-install -Syu
 RUN xbps-install -Sy ca-certificates libstdc++
 COPY --from=builder \
     /root/src/target/release/dicebot \

LICENSE

@@ -1,16 +1,12 @@
-This software project is governed by the terms of the Affero GNU
-General Public License. Portions of the code come from the original
+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. Some portions of the code are also taken from the Rust
-Matrix SDK examples, which are governed by the MIT license. 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.
+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
 
-Rust Matrix SDK: https://github.com/matrix-org/matrix-rust-sdk
-
 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:

README.md

@@ -1,6 +1,7 @@
 # Tenebrous Dicebot
 
 [![Build Status](https://drone.agnos.is/api/badges/projectmoon/tenebrous-dicebot/status.svg)](https://drone.agnos.is/projectmoon/tenebrous-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]._
@@ -24,6 +25,23 @@ 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
@@ -46,6 +64,17 @@ 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
@@ -89,8 +118,16 @@ expressions.
 !r 3d12 - 5d2 + 3 - 7d3 + 20d20
 ```
 
-This system does not yet have the capability to handle things like D&D
-5e advantage or disadvantage.
+#### Keep/Drop Dice
+The bot supports either keeping the highest dice in a roll, or
+dropping the highest dice in a roll.  This allows the bot to handle 
+things like D&D 5e advantage or disadvantage.
+
+```
+!roll 2d20k1
+!r 2d20dh1 + 5
+!r 10d10k5 + 10d10dh5 - 2
+```
 
 ### Storytelling System
 
@@ -241,6 +278,7 @@ The most basic plans are:
 * Perhaps some sort of character sheet integration. But for that, we
   would need a sheet service.
 * Use environment variables instead of config file in Docker image.
+* Per-system game rules.
 
 ## Credits
 
@@ -254,3 +292,9 @@ support added for Chronicles of Darkness and Call of Cthulhu.
 [main-repo]: https://git.agnos.is/projectmoon/tenebrous-dicebot
 [github-repo]: https://github.com/ProjectMoon/matrix-dicebot
 [roadmap]: https://git.agnos.is/projectmoon/tenebrous-dicebot/wiki/Roadmap
+[crates-io]: https://crates.io/crates/tenebrous-dicebot
+[matrix-room]: https://matrix.to/#/#tenebrous:agnos.is
+[agnosis-git-issues]: https://git.agnos.is/projectmoon/tenebrous-dicebot/issues
+[github-discussions]: https://github.com/ProjectMoon/matrix-dicebot/discussions
+[github-issues]: https://github.com/ProjectMoon/matrix-dicebot/issues
+[agpl]: https://www.gnu.org/licenses/agpl-3.0.en.html

dicebot/Cargo.toml

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

dicebot/sqlx-data.json

@@ -18,6 +18,26 @@
       ]
     }
   },
+  "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": {
@@ -60,28 +80,14 @@
       ]
     }
   },
-  "64e137107139c56a43f7041db933671c210df4fa5110fe481d191fd63b2d3aeb": {
-    "query": "SELECT user_id, password FROM accounts\n               WHERE user_id = ?",
+  "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": [
-        {
-          "name": "user_id",
-          "ordinal": 0,
-          "type_info": "Text"
-        },
-        {
-          "name": "password",
-          "ordinal": 1,
-          "type_info": "Text"
-        }
-      ],
+      "columns": [],
       "parameters": {
-        "Right": 1
+        "Right": 3
       },
-      "nullable": [
-        false,
-        false
-      ]
+      "nullable": []
     }
   },
   "711d222911c1258365a6a0de1fe00eeec4686fd3589e976e225ad599e7cfc75d": {
@@ -102,66 +108,6 @@
       ]
     }
   },
-  "7248c8ae30bbe4bc5866e80cc277312c7f8cb9af5a8801fd8eaf178fd99eae18": {
-    "query": "SELECT room_id FROM room_users\n               WHERE username = ?",
-    "describe": {
-      "columns": [
-        {
-          "name": "room_id",
-          "ordinal": 0,
-          "type_info": "Text"
-        }
-      ],
-      "parameters": {
-        "Right": 1
-      },
-      "nullable": [
-        false
-      ]
-    }
-  },
-  "97f5d58f62baca51efd8c295ca6737d1240923c69c973621cd0a718ac9eed99f": {
-    "query": "SELECT room_id, room_name FROM room_info\n               WHERE room_id = ?",
-    "describe": {
-      "columns": [
-        {
-          "name": "room_id",
-          "ordinal": 0,
-          "type_info": "Text"
-        },
-        {
-          "name": "room_name",
-          "ordinal": 1,
-          "type_info": "Text"
-        }
-      ],
-      "parameters": {
-        "Right": 1
-      },
-      "nullable": [
-        false,
-        false
-      ]
-    }
-  },
-  "b302d586e5ac4c72c2970361ea5a5936c0b8c6dad10033c626a0ce0404cadb25": {
-    "query": "SELECT username FROM room_users\n                        WHERE room_id = ?",
-    "describe": {
-      "columns": [
-        {
-          "name": "username",
-          "ordinal": 0,
-          "type_info": "Text"
-        }
-      ],
-      "parameters": {
-        "Right": 1
-      },
-      "nullable": [
-        false
-      ]
-    }
-  },
   "bba0fc255e7c30d1d2d9468c68ba38db6e8a13be035aa1152933ba9247b14f8c": {
     "query": "SELECT event_id FROM room_events\n               WHERE room_id = ? AND event_id = ?",
     "describe": {
@@ -179,5 +125,15 @@
         false
       ]
     }
+  },
+  "dce9bb45cf954054a920ee8b53852c6d562e3588d76bbfaa1433d8309d4e4921": {
+    "query": "DELETE FROM user_state WHERE user_id = ?",
+    "describe": {
+      "columns": [],
+      "parameters": {
+        "Right": 1
+      },
+      "nullable": []
+    }
   }
 }

dicebot/src/basic/dice.rs

@@ -6,23 +6,52 @@
 use std::fmt;
 use std::ops::{Deref, DerefMut};
 
-//Old stuff, for regular dice rolling. To be moved elsewhere.
-
+/// A basic dice roll, in XdY notation, like "1d4" or "3d6".
+/// Optionally supports D&D advantage/disadvantge keep-or-drop
+/// functionality.
 #[derive(Debug, PartialEq, Eq, Clone, Copy)]
 pub struct Dice {
     pub(crate) count: u32,
     pub(crate) sides: u32,
+    pub(crate) keep_drop: KeepOrDrop,
+}
+
+/// Enum indicating how to handle bonuses or penalties using extra
+/// dice. If set to Keep, the roll will keep the highest X number of
+/// dice in the roll, and add those together. If set to Drop, the
+/// opposite is performed, and the lowest X number of dice are added
+/// instead. If set to None, then all dice in the roll are added up as
+/// normal.
+#[derive(Debug, PartialEq, Eq, Clone, Copy)]
+pub enum KeepOrDrop {
+    /// Keep only the X highest dice for adding up to the total.
+    Keep(u32),
+
+    /// Keep only the X lowest dice (i.e. drop the highest) for adding
+    /// up to the total.
+    Drop(u32),
+
+    /// Add up all dice in the roll for the total.
+    None,
 }
 
 impl fmt::Display for Dice {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(f, "{}d{}", self.count, self.sides)
+        match self.keep_drop {
+            KeepOrDrop::Keep(keep) => write!(f, "{}d{}k{}", self.count, self.sides, keep),
+            KeepOrDrop::Drop(drop) => write!(f, "{}d{}dh{}", self.count, self.sides, drop),
+            KeepOrDrop::None => write!(f, "{}d{}", self.count, self.sides),
+        }
     }
 }
 
 impl Dice {
-    pub fn new(count: u32, sides: u32) -> Dice {
-        Dice { count, sides }
+    pub fn new(count: u32, sides: u32, keep_drop: KeepOrDrop) -> Dice {
+        Dice {
+            count,
+            sides,
+            keep_drop,
+        }
     }
 }
 

dicebot/src/basic/parser.rs

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

dicebot/src/basic/roll.rs

@@ -4,6 +4,7 @@
  * project.
  */
 use crate::basic::dice;
+use crate::basic::dice::KeepOrDrop;
 use rand::prelude::*;
 use std::fmt;
 use std::ops::{Deref, DerefMut};
@@ -19,15 +20,27 @@ pub trait Rolled {
 }
 
 #[derive(Debug, PartialEq, Eq, Clone)]
-pub struct DiceRoll(pub Vec<u32>);
+/// array of rolls in order, how many dice to keep, and how many to drop
+///   keep indicates how many of the highest dice to keep
+///   drop indicates how many of the highest dice to drop
+pub struct DiceRoll (pub Vec<u32>, usize, usize);
 
 impl DiceRoll {
     pub fn rolls(&self) -> &[u32] {
         &self.0
     }
 
+    pub fn keep(&self) -> usize {
+        self.1
+    }
+
+    pub fn drop(&self) -> usize {
+        self.2
+    }
+
+    // only count kept dice in total
     pub fn total(&self) -> u32 {
-        self.0.iter().sum()
+        self.0[self.2..self.1].iter().sum()
     }
 }
 
@@ -41,11 +54,21 @@ impl fmt::Display for DiceRoll {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         write!(f, "{}", self.rolled_value())?;
         let rolls = self.rolls();
-        let mut iter = rolls.iter();
+        let keep  = self.keep();
+        let drop  = self.drop();
+        let mut iter = rolls.iter().enumerate();
         if let Some(first) = iter.next() {
-            write!(f, " ({}", first)?;
+            if drop != 0 {
+                write!(f, " ([{}]", first.1)?;
+            } else {
+                write!(f, " ({}", first.1)?;
+            }
             for roll in iter {
-                write!(f, " + {}", roll)?;
+                if roll.0 >= keep || roll.0 < drop {
+                    write!(f, " + [{}]", roll.1)?;
+                } else {
+                    write!(f, " + {}", roll.1)?;
+                }
             }
             write!(f, ")")?;
         }
@@ -58,11 +81,17 @@ impl Roll for dice::Dice {
 
     fn roll(&self) -> DiceRoll {
         let mut rng = rand::thread_rng();
-        let rolls: Vec<_> = (0..self.count)
+        let mut rolls: Vec<_> = (0..self.count)
             .map(|_| rng.gen_range(1..=self.sides))
             .collect();
+        // sort rolls in descending order
+        rolls.sort_by(|a, b| b.cmp(a));
 
-        DiceRoll(rolls)
+        match self.keep_drop {
+            KeepOrDrop::Keep(k)  => DiceRoll(rolls,k as usize, 0),
+            KeepOrDrop::Drop(dh) => DiceRoll(rolls,self.count as usize, dh as usize),
+            KeepOrDrop::None     => DiceRoll(rolls,self.count as usize, 0),
+        }
     }
 }
 
@@ -198,18 +227,26 @@ mod tests {
     use super::*;
     #[test]
     fn dice_roll_display_test() {
-        assert_eq!(DiceRoll(vec![1, 3, 4]).to_string(), "8 (1 + 3 + 4)");
-        assert_eq!(DiceRoll(vec![]).to_string(), "0");
+        assert_eq!(DiceRoll(vec![1, 3, 4], 3, 0).to_string(), "8 (1 + 3 + 4)");
+        assert_eq!(DiceRoll(vec![], 0, 0).to_string(), "0");
         assert_eq!(
-            DiceRoll(vec![4, 7, 2, 10]).to_string(),
+            DiceRoll(vec![4, 7, 2, 10], 4, 0).to_string(),
             "23 (4 + 7 + 2 + 10)"
         );
+        assert_eq!(
+            DiceRoll(vec![20, 13, 11, 10], 3, 0).to_string(),
+            "44 (20 + 13 + 11 + [10])"
+        );
+        assert_eq!(
+            DiceRoll(vec![20, 13, 11, 10], 4, 1).to_string(),
+            "34 ([20] + 13 + 11 + 10)"
+        );
     }
 
     #[test]
     fn element_roll_display_test() {
         assert_eq!(
-            ElementRoll::Dice(DiceRoll(vec![1, 3, 4])).to_string(),
+            ElementRoll::Dice(DiceRoll(vec![1, 3, 4], 3, 0)).to_string(),
             "8 (1 + 3 + 4)"
         );
         assert_eq!(ElementRoll::Bonus(7).to_string(), "7");
@@ -218,11 +255,11 @@ mod tests {
     #[test]
     fn signed_element_roll_display_test() {
         assert_eq!(
-            SignedElementRoll::Positive(ElementRoll::Dice(DiceRoll(vec![1, 3, 4]))).to_string(),
+            SignedElementRoll::Positive(ElementRoll::Dice(DiceRoll(vec![1, 3, 4], 3, 0))).to_string(),
             "8 (1 + 3 + 4)"
         );
         assert_eq!(
-            SignedElementRoll::Negative(ElementRoll::Dice(DiceRoll(vec![1, 3, 4]))).to_string(),
+            SignedElementRoll::Negative(ElementRoll::Dice(DiceRoll(vec![1, 3, 4], 3, 0))).to_string(),
             "-8 (1 + 3 + 4)"
         );
         assert_eq!(
@@ -239,14 +276,14 @@ mod tests {
     fn element_expression_roll_display_test() {
         assert_eq!(
             ElementExpressionRoll(vec![SignedElementRoll::Positive(ElementRoll::Dice(
-                DiceRoll(vec![1, 3, 4])
+                DiceRoll(vec![1, 3, 4], 3, 0)
             )),])
             .to_string(),
             "8 (1 + 3 + 4)"
         );
         assert_eq!(
             ElementExpressionRoll(vec![SignedElementRoll::Negative(ElementRoll::Dice(
-                DiceRoll(vec![1, 3, 4])
+                DiceRoll(vec![1, 3, 4], 3, 0)
             )),])
             .to_string(),
             "-8 (1 + 3 + 4)"
@@ -263,8 +300,8 @@ mod tests {
         );
         assert_eq!(
             ElementExpressionRoll(vec![
-                SignedElementRoll::Positive(ElementRoll::Dice(DiceRoll(vec![1, 3, 4]))),
-                SignedElementRoll::Negative(ElementRoll::Dice(DiceRoll(vec![1, 2]))),
+                SignedElementRoll::Positive(ElementRoll::Dice(DiceRoll(vec![1, 3, 4], 3, 0))),
+                SignedElementRoll::Negative(ElementRoll::Dice(DiceRoll(vec![1, 2], 2, 0))),
                 SignedElementRoll::Positive(ElementRoll::Bonus(4)),
                 SignedElementRoll::Negative(ElementRoll::Bonus(7)),
             ])
@@ -273,13 +310,33 @@ mod tests {
         );
         assert_eq!(
             ElementExpressionRoll(vec![
-                SignedElementRoll::Negative(ElementRoll::Dice(DiceRoll(vec![1, 3, 4]))),
-                SignedElementRoll::Positive(ElementRoll::Dice(DiceRoll(vec![1, 2]))),
+                SignedElementRoll::Negative(ElementRoll::Dice(DiceRoll(vec![1, 3, 4], 3, 0))),
+                SignedElementRoll::Positive(ElementRoll::Dice(DiceRoll(vec![1, 2], 2, 0))),
                 SignedElementRoll::Negative(ElementRoll::Bonus(4)),
                 SignedElementRoll::Positive(ElementRoll::Bonus(7)),
             ])
             .to_string(),
             "-2 (-8 (1 + 3 + 4) + 3 (1 + 2) - 4 + 7)"
         );
+        assert_eq!(
+            ElementExpressionRoll(vec![
+                SignedElementRoll::Negative(ElementRoll::Dice(DiceRoll(vec![4, 3, 1], 3, 0))),
+                SignedElementRoll::Positive(ElementRoll::Dice(DiceRoll(vec![12, 2], 1, 0))),
+                SignedElementRoll::Negative(ElementRoll::Bonus(4)),
+                SignedElementRoll::Positive(ElementRoll::Bonus(7)),
+            ])
+            .to_string(),
+            "7 (-8 (4 + 3 + 1) + 12 (12 + [2]) - 4 + 7)"
+        );
+        assert_eq!(
+            ElementExpressionRoll(vec![
+                SignedElementRoll::Negative(ElementRoll::Dice(DiceRoll(vec![4, 3, 1], 3, 1))),
+                SignedElementRoll::Positive(ElementRoll::Dice(DiceRoll(vec![12, 2], 2, 0))),
+                SignedElementRoll::Negative(ElementRoll::Bonus(4)),
+                SignedElementRoll::Positive(ElementRoll::Bonus(7)),
+            ])
+            .to_string(),
+            "13 (-4 ([4] + 3 + 1) + 14 (12 + 2) - 4 + 7)"
+        );
     }
 }

dicebot/src/bin/dicebot-cmd.rs

@@ -1,9 +1,11 @@
-use matrix_sdk::identifiers::room_id;
+use matrix_sdk::ruma::room_id;
+use matrix_sdk::Client;
 use tenebrous_dicebot::commands;
 use tenebrous_dicebot::commands::ResponseExtractor;
 use tenebrous_dicebot::context::{Context, RoomContext};
 use tenebrous_dicebot::db::sqlite::Database;
 use tenebrous_dicebot::error::BotError;
+use tenebrous_dicebot::models::Account;
 use url::Url;
 
 #[tokio::main]
@@ -25,10 +27,15 @@ async fn main() -> Result<(), BotError> {
     .await?;
 
     let context = Context {
-        db: db,
-        matrix_client: &matrix_sdk::Client::new(homeserver)
-            .expect("Could not create matrix client"),
-        room: RoomContext {
+        db,
+        account: Account::default(),
+        matrix_client: Client::new(homeserver).await.expect("Could not create matrix client"),
+        origin_room: RoomContext {
+            id: &room_id!("!fakeroomid:example.com"),
+            display_name: "fake room".to_owned(),
+            secure: false,
+        },
+        active_room: RoomContext {
             id: &room_id!("!fakeroomid:example.com"),
             display_name: "fake room".to_owned(),
             secure: false,

dicebot/src/bin/dicebot.rs

@@ -1,21 +1,36 @@
 //Needed for nested Result handling from tokio. Probably can go away after 1.47.0.
 #![type_length_limit = "7605144"]
+use futures::try_join;
 use log::error;
+use matrix_sdk::Client;
 use std::env;
 use std::sync::{Arc, RwLock};
 use tenebrous_dicebot::bot::DiceBot;
 use tenebrous_dicebot::config::*;
 use tenebrous_dicebot::db::sqlite::Database;
 use tenebrous_dicebot::error::BotError;
+use tenebrous_dicebot::rpc;
 use tenebrous_dicebot::state::DiceBotState;
 use tracing_subscriber::filter::EnvFilter;
 
+/// Attempt to create config object and ddatabase connection pool from
+/// the given config path. An error is returned if config creation or
+/// database pool creation fails for some reason.
+async fn init(config_path: &str) -> Result<(Arc<Config>, Database, Client), BotError> {
+    let cfg = read_config(config_path)?;
+    let cfg = Arc::new(cfg);
+    let sqlite_path = format!("{}/dicebot.sqlite", cfg.database_path());
+    let db = Database::new(&sqlite_path).await?;
+    let client = tenebrous_dicebot::matrix::create_client(&cfg).await?;
+    Ok((cfg, db, client))
+}
+
 #[tokio::main]
-async fn main() {
+async fn main() -> Result<(), BotError> {
     let filter = if env::var("RUST_LOG").is_ok() {
         EnvFilter::from_default_env()
     } else {
-        EnvFilter::new("tenebrous_dicebot=info,dicebot=info,refinery=info")
+        EnvFilter::new("tonic=info,tenebrous_dicebot=info,dicebot=info,refinery=info")
     };
 
     tracing_subscriber::fmt().with_env_filter(filter).init();
@@ -23,7 +38,9 @@ async fn main() {
     match run().await {
         Ok(_) => (),
         Err(e) => error!("Error: {}", e),
-    };
+    }
+
+    Ok(())
 }
 
 async fn run() -> Result<(), BotError> {
@@ -32,12 +49,22 @@ async fn run() -> Result<(), BotError> {
         .next()
         .expect("Need a config as an argument");
 
-    let cfg = Arc::new(read_config(config_path)?);
-    let sqlite_path = format!("{}/dicebot.sqlite", cfg.database_path());
-    let db = Database::new(&sqlite_path).await?;
+    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) {
+    match DiceBot::new(cfg, &state, db, client) {
         Ok(bot) => bot.run().await?,
         Err(e) => println!("Error connecting: {:?}", e),
     };

dicebot/src/bin/tonic_client.rs

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

dicebot/src/bot/command_execution.rs

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

dicebot/src/bot/event_handlers.rs

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

dicebot/src/bot/mod.rs

@@ -1,16 +1,18 @@
-use crate::commands::{ExecutionError, ExecutionResult};
+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 dirs;
 use log::info;
-use matrix_sdk::{self, identifiers::EventId, room::Joined, Client, ClientConfig, SyncSettings};
+use matrix_sdk::room::Room;
+use matrix_sdk::ruma::events::room::message::RoomMessageEventContent;
+use matrix_sdk::ruma::events::SyncMessageLikeEvent;
+use matrix_sdk::ruma::OwnedEventId;
+use matrix_sdk::{self, room::Joined, Client};
+use matrix_sdk::config::SyncSettings;
 use std::clone::Clone;
-use std::path::PathBuf;
 use std::sync::{Arc, RwLock};
-use url::Url;
 
 mod command_execution;
 pub mod event_handlers;
@@ -21,6 +23,7 @@ const MAX_COMMANDS_PER_MESSAGE: usize = 50;
 
 /// The DiceBot struct represents an active dice bot. The bot is not
 /// connected to Matrix until its run() function is called.
+#[derive(Clone)]
 pub struct DiceBot {
     /// A reference to the configuration read in on application start.
     config: Arc<Config>,
@@ -35,22 +38,6 @@ pub struct DiceBot {
     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)?)
-}
-
 impl DiceBot {
     /// Create a new dicebot with the given configuration and state
     /// actor. This function returns a Result because it is possible
@@ -60,9 +47,10 @@ impl DiceBot {
         config: &Arc<Config>,
         state: &Arc<RwLock<DiceBotState>>,
         db: &Database,
+        client: &Client,
     ) -> Result<Self, BotError> {
         Ok(DiceBot {
-            client: create_client(&config)?,
+            client: client.clone(),
             config: config.clone(),
             state: state.clone(),
             db: db.clone(),
@@ -81,12 +69,14 @@ impl DiceBot {
         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?;
+        let no_device_ld_login = || client.login_username(username, password);
+        let device_id_login = |id| client.login_username(username, password).device_id(id);
+        let login = device_id.map_or_else(no_device_ld_login, device_id_login);
+
+        login.send().await?;
 
         if device_id.is_none() {
-            let device_id = client.device_id().await.ok_or(BotError::NoDeviceIdFound)?;
+            let device_id = client.device_id().ok_or(BotError::NoDeviceIdFound)?;
             self.db.set_device_id(device_id.as_str()).await?;
             info!("Recorded new device ID: {}", device_id.as_str());
         } else {
@@ -97,19 +87,35 @@ impl DiceBot {
         Ok(())
     }
 
+    async fn bind_events(&self) {
+        //on room message: need closure to pass bot ref in.
+        self.client
+            .add_event_handler({
+                let bot: DiceBot = self.clone();
+                move |event: SyncMessageLikeEvent<RoomMessageEventContent>, room: Room| {
+                    let bot = bot.clone();
+                    async move { event_handlers::on_room_message(event, room, bot).await }
+                }
+            });
+
+        //auto-join handler
+        self.client
+            .add_event_handler(event_handlers::on_stripped_state_member);
+    }
+
     /// Logs the bot in to Matrix and listens for events until program
     /// terminated, or a panic occurs. Originally adapted from the
     /// matrix-rust-sdk command bot example.
     pub async fn run(self) -> Result<(), BotError> {
         let client = self.client.clone();
         self.login(&client).await?;
+        self.bind_events().await;
 
-        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;
+        client.sync(SyncSettings::default()).await?;
         Ok(())
     }
 
@@ -129,10 +135,7 @@ impl DiceBot {
         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(ExecutionError(BotError::MessageTooLarge)),
-            )]
+            vec![("".to_owned(), Err(BotError::MessageTooLarge))]
         };
 
         results
@@ -142,7 +145,7 @@ impl DiceBot {
         &self,
         room: &Joined,
         sender_username: &str,
-        event_id: EventId,
+        event_id: OwnedEventId,
         results: Vec<(String, ExecutionResult)>,
     ) {
         if results.len() >= 1 {

dicebot/src/cofd/dice.rs

@@ -332,7 +332,7 @@ mod tests {
     macro_rules! dummy_room {
         () => {
             crate::context::RoomContext {
-                id: &matrix_sdk::identifiers::room_id!("!fakeroomid:example.com"),
+                id: &matrix_sdk::ruma::room_id!("!fakeroomid:example.com"),
                 display_name: "displayname".to_owned(),
                 secure: false,
             }
@@ -483,9 +483,11 @@ mod tests {
             .unwrap();
 
         let ctx = Context {
+            account: crate::models::Account::default(),
             db: db,
-            matrix_client: &matrix_sdk::Client::new(homeserver).unwrap(),
-            room: dummy_room!(),
+            matrix_client: matrix_sdk::Client::new(homeserver).await.unwrap(),
+            origin_room: dummy_room!(),
+            active_room: dummy_room!(),
             username: "username",
             message_body: "message",
         };
@@ -523,9 +525,11 @@ mod tests {
 
         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(),
-            room: dummy_room!(),
+            matrix_client: matrix_sdk::Client::new(homeserver).await.unwrap(),
+            origin_room: dummy_room!(),
+            active_room: dummy_room!(),
             username: "username",
             message_body: "message",
         };
@@ -560,16 +564,23 @@ mod tests {
 
         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(),
-            room: dummy_room!(),
+            matrix_client: matrix_sdk::Client::new(homeserver).await.unwrap(),
+            origin_room: dummy_room!(),
+            active_room: dummy_room!(),
             username: "username",
             message_body: "message",
         };
 
-        db.set_user_variable(&ctx.username, &ctx.room.id.as_str(), "myvariable", 10)
-            .await
-            .expect("could not set myvariable to 10");
+        db.set_user_variable(
+            &ctx.username,
+            &ctx.origin_room.id.as_str(),
+            "myvariable",
+            10,
+        )
+        .await
+        .expect("could not set myvariable to 10");
 
         let amounts = vec![Amount {
             operator: Operator::Plus,

dicebot/src/cofd/parser.rs

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

dicebot/src/commands/basic_rolling.rs

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

dicebot/src/commands/cofd.rs

@@ -1,10 +1,29 @@
 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 {

dicebot/src/commands/cthulhu.rs

@@ -4,10 +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 {
@@ -33,6 +45,15 @@ 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 {

dicebot/src/commands/management.rs

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

dicebot/src/commands/misc.rs

@@ -1,10 +1,21 @@
 use super::{Command, Execution, ExecutionResult};
 use crate::context::Context;
-use crate::help::HelpTopic;
+use crate::error::BotError;
+use crate::help::{parse_help_topic, HelpTopic};
 use async_trait::async_trait;
+use std::convert::TryFrom;
 
 pub struct HelpCommand(pub Option<HelpTopic>);
 
+impl TryFrom<String> for HelpCommand {
+    type Error = BotError;
+
+    fn try_from(input: String) -> Result<Self, Self::Error> {
+        let topic = parse_help_topic(&input);
+        Ok(HelpCommand(topic))
+    }
+}
+
 #[async_trait]
 impl Command for HelpCommand {
     fn name(&self) -> &'static str {

dicebot/src/commands/mod.rs

@@ -3,7 +3,6 @@ use crate::error::BotError;
 use async_trait::async_trait;
 use log::{error, info};
 use thiserror::Error;
-use BotError::DataError;
 
 pub mod basic_rolling;
 pub mod cofd;
@@ -11,6 +10,7 @@ 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.
@@ -46,29 +46,9 @@ impl Execution {
     }
 }
 
-/// 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(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>;
+pub type ExecutionResult = Result<Execution, BotError>;
 
 /// Extract response messages out of a type, whether it is success or
 /// failure.
@@ -76,6 +56,8 @@ 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 {
@@ -89,10 +71,23 @@ impl ResponseExtractor for ExecutionResult {
         );
 
         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/>"),
+            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.
@@ -109,27 +104,22 @@ pub trait Command: Send + Sync {
 /// ever. Later, we can add stuff like admin/regular user power
 /// separation, etc.
 fn execution_allowed(cmd: &(impl Command + ?Sized), ctx: &Context<'_>) -> Result<(), CommandError> {
-    if cmd.is_secure() {
-        if ctx.is_secure() {
-            Ok(())
-        } else {
-            Err(CommandError::InsecureExecution)
-        }
-    } else {
-        Ok(())
+    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 (successfully or
-/// not). If a command is determined to be ignored, this function will
-/// return None, signifying that we should not send a response.
+/// 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(ExecutionError(e.into())),
+        Err(e) => Err(e.into()),
     };
 
     log_command(cmd.as_ref(), ctx, &result);
@@ -141,25 +131,27 @@ fn log_command(cmd: &(impl Command + ?Sized), ctx: &Context, result: &ExecutionR
     use substring::Substring;
     let command = match cmd.is_secure() {
         true => cmd.name(),
-        false => ctx.message_body.substring(0, 30),
+        false => ctx.message_body,
     };
 
-    let dots = match ctx.message_body.len() {
+    let dots = match command.len() {
         _len if _len > 30 => "[...]",
         _ => "",
     };
 
+    let command = command.substring(0, 30);
+
     match result {
         Ok(_) => {
             info!(
                 "[{}] {} <{}{}> - success",
-                ctx.room.display_name, ctx.username, command, dots
+                ctx.origin_room.display_name, ctx.username, command, dots
             );
         }
         Err(e) => {
             error!(
                 "[{}] {} <{}{}> - {}",
-                ctx.room.display_name, ctx.username, command, dots, e
+                ctx.origin_room.display_name, ctx.username, command, dots, e
             );
         }
     };
@@ -170,11 +162,12 @@ mod tests {
     use super::*;
     use management::RegisterCommand;
     use url::Url;
+    use matrix_sdk::ruma::room_id;
 
     macro_rules! dummy_room {
         () => {
             crate::context::RoomContext {
-                id: &matrix_sdk::identifiers::room_id!("!fakeroomid:example.com"),
+                id: &room_id!("!fakeroomid:example.com"),
                 display_name: "displayname".to_owned(),
                 secure: false,
             }
@@ -184,7 +177,7 @@ mod tests {
     macro_rules! secure_room {
         () => {
             crate::context::RoomContext {
-                id: &matrix_sdk::identifiers::room_id!("!fakeroomid:example.com"),
+                id: &room_id!("!fakeroomid:example.com"),
                 display_name: "displayname".to_owned(),
                 secure: true,
             }
@@ -201,14 +194,16 @@ mod tests {
         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(),
-            room: secure_room!(),
+            matrix_client: matrix_sdk::Client::new(homeserver).await.unwrap(),
+            origin_room: secure_room!(),
+            active_room: secure_room!(),
             username: "myusername",
             message_body: "!notacommand",
         };
 
-        let cmd = RegisterCommand("".to_owned());
+        let cmd = RegisterCommand;
         assert_eq!(execution_allowed(&cmd, &ctx).is_ok(), true);
     }
 
@@ -222,9 +217,11 @@ mod tests {
         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(),
-            room: secure_room!(),
+            matrix_client: matrix_sdk::Client::new(homeserver).await.unwrap(),
+            origin_room: secure_room!(),
+            active_room: secure_room!(),
             username: "myusername",
             message_body: "!notacommand",
         };
@@ -243,9 +240,11 @@ mod tests {
         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(),
-            room: dummy_room!(),
+            matrix_client: matrix_sdk::Client::new(homeserver).await.unwrap(),
+            origin_room: dummy_room!(),
+            active_room: dummy_room!(),
             username: "myusername",
             message_body: "!notacommand",
         };
@@ -264,26 +263,19 @@ mod tests {
         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(),
-            room: dummy_room!(),
+            matrix_client: matrix_sdk::Client::new(homeserver).await.unwrap(),
+            origin_room: dummy_room!(),
+            active_room: dummy_room!(),
             username: "myusername",
             message_body: "!notacommand",
         };
 
-        let cmd = RegisterCommand("".to_owned());
+        let cmd = RegisterCommand;
         assert_eq!(execution_allowed(&cmd, &ctx).is_err(), true);
     }
 
-    #[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(flavor = "multi_thread", worker_threads = 1)]
     async fn unrecognized_command() {
         let db_path = tempfile::NamedTempFile::new_in(".").unwrap();
@@ -294,9 +286,11 @@ mod tests {
         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(),
-            room: dummy_room!(),
+            matrix_client: matrix_sdk::Client::new(homeserver).await.unwrap(),
+            origin_room: dummy_room!(),
+            active_room: dummy_room!(),
             username: "myusername",
             message_body: "!notacommand",
         };

dicebot/src/commands/parser.rs

@@ -3,26 +3,22 @@
  * governed by the terms of the MIT license, from the original
  * axfive-matrix-dicebot project.
  */
-use crate::basic::parser::parse_element_expression;
-use crate::cofd::parser::{create_chance_die, parse_dice_pool};
 use crate::commands::{
     basic_rolling::RollCommand,
     cofd::PoolRollCommand,
     cthulhu::{CthAdvanceRoll, CthRoll},
-    management::{CheckCommand, RegisterCommand, UnregisterCommand},
+    management::{CheckCommand, LinkCommand, RegisterCommand, UnlinkCommand, UnregisterCommand},
     misc::HelpCommand,
+    rooms::{ListRoomsCommand, SetRoomCommand},
     variables::{
         DeleteVariableCommand, GetAllVariablesCommand, GetVariableCommand, SetVariableCommand,
     },
     Command,
 };
-use crate::cthulhu::parser::{parse_advancement_roll, parse_regular_roll};
 use crate::error::BotError;
-use crate::help::parse_help_topic;
-use crate::parser::variables::parse_set_variable;
 use combine::parser::char::{char, letter, space};
 use combine::{any, many1, optional, Parser};
-use nom::Err as NomErr;
+use std::convert::TryFrom;
 use thiserror::Error;
 
 #[derive(Debug, Clone, PartialEq, Error)]
@@ -34,73 +30,6 @@ pub enum CommandParsingError {
     InternalParseError(#[from] combine::error::StringStreamError),
 }
 
-// Parse a roll expression.
-fn parse_roll(input: &str) -> Result<Box<dyn Command>, BotError> {
-    let result = parse_element_expression(input);
-    match result {
-        Ok((rest, expression)) if rest.len() == 0 => Ok(Box::new(RollCommand(expression))),
-        //Legacy code boundary translates nom errors into BotErrors.
-        Ok(_) => Err(BotError::NomParserIncomplete),
-        Err(NomErr::Error(e)) => Err(BotError::NomParserError(e.1)),
-        Err(NomErr::Failure(e)) => Err(BotError::NomParserError(e.1)),
-        Err(NomErr::Incomplete(_)) => Err(BotError::NomParserIncomplete),
-    }
-}
-
-fn parse_register_command(input: &str) -> Result<Box<dyn Command>, BotError> {
-    Ok(Box::new(RegisterCommand(input.to_owned())))
-}
-
-fn parse_check_command(input: &str) -> Result<Box<dyn Command>, BotError> {
-    Ok(Box::new(CheckCommand(input.to_owned())))
-}
-
-fn parse_unregister_command() -> Result<Box<dyn Command>, BotError> {
-    Ok(Box::new(UnregisterCommand))
-}
-
-fn parse_get_variable_command(input: &str) -> Result<Box<dyn Command>, BotError> {
-    Ok(Box::new(GetVariableCommand(input.to_owned())))
-}
-
-fn parse_set_variable_command(input: &str) -> Result<Box<dyn Command>, BotError> {
-    let (variable_name, value) = parse_set_variable(input)?;
-    Ok(Box::new(SetVariableCommand(variable_name, value)))
-}
-
-fn parse_delete_variable_command(input: &str) -> Result<Box<dyn Command>, BotError> {
-    Ok(Box::new(DeleteVariableCommand(input.to_owned())))
-}
-
-fn parse_pool_roll(input: &str) -> Result<Box<dyn Command>, BotError> {
-    let pool = parse_dice_pool(input)?;
-    Ok(Box::new(PoolRollCommand(pool)))
-}
-
-fn parse_cth_roll(input: &str) -> Result<Box<dyn Command>, BotError> {
-    let roll = parse_regular_roll(input)?;
-    Ok(Box::new(CthRoll(roll)))
-}
-
-fn parse_cth_advancement_roll(input: &str) -> Result<Box<dyn Command>, BotError> {
-    let roll = parse_advancement_roll(input)?;
-    Ok(Box::new(CthAdvanceRoll(roll)))
-}
-
-fn chance_die() -> Result<Box<dyn Command>, BotError> {
-    let pool = create_chance_die()?;
-    Ok(Box::new(PoolRollCommand(pool)))
-}
-
-fn get_all_variables() -> Result<Box<dyn Command>, BotError> {
-    Ok(Box::new(GetAllVariablesCommand))
-}
-
-fn help(topic: &str) -> Result<Box<dyn Command>, BotError> {
-    let topic = parse_help_topic(topic);
-    Ok(Box::new(HelpCommand(topic)))
-}
-
 /// Split an input string into its constituent command and "everything
 /// else" parts. Extracts the command separately from its input (i.e.
 /// rest of the line) and returns a tuple of (command_input, command).
@@ -132,25 +61,37 @@ fn split_command(input: &str) -> Result<(String, String), CommandParsingError> {
     Ok((command, command_input))
 }
 
+/// Atempt to convert text input to a Boxed command type. Shortens
+/// boilerplate.
+macro_rules! convert_to {
+    ($type:ident, $input: expr) => {
+        $type::try_from($input).map(|cmd| Box::new(cmd) as Box<dyn Command>)
+    };
+}
+
 /// Potentially parse a command expression. If we recognize the
 /// command, an error should be raised if the command is misparsed. If
 /// we don't recognize the command, 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() {
-            "variables" => get_all_variables(),
-            "get" => parse_get_variable_command(&cmd_input),
-            "set" => parse_set_variable_command(&cmd_input),
-            "del" => parse_delete_variable_command(&cmd_input),
-            "r" | "roll" => parse_roll(&cmd_input),
-            "rp" | "pool" => parse_pool_roll(&cmd_input),
-            "cthroll" => parse_cth_roll(&cmd_input),
-            "cthadv" | "ctharoll" => parse_cth_advancement_roll(&cmd_input),
-            "chance" => chance_die(),
-            "help" => help(&cmd_input),
-            "register" => parse_register_command(&cmd_input),
-            "check" => parse_check_command(&cmd_input),
-            "unregister" => parse_unregister_command(),
+            "variables" => convert_to!(GetAllVariablesCommand, cmd_input),
+            "get" => convert_to!(GetVariableCommand, cmd_input),
+            "set" => convert_to!(SetVariableCommand, cmd_input),
+            "del" => convert_to!(DeleteVariableCommand, cmd_input),
+            "r" | "roll" => convert_to!(RollCommand, cmd_input),
+            "rp" | "pool" => convert_to!(PoolRollCommand, cmd_input),
+            "chance" => PoolRollCommand::chance_die().map(|cmd| Box::new(cmd) as Box<dyn Command>),
+            "cthroll" => convert_to!(CthRoll, cmd_input),
+            "cthadv" | "ctharoll" => convert_to!(CthAdvanceRoll, cmd_input),
+            "help" => convert_to!(HelpCommand, cmd_input),
+            "register" => convert_to!(RegisterCommand, cmd_input),
+            "link" => convert_to!(LinkCommand, cmd_input),
+            "unlink" => convert_to!(UnlinkCommand, cmd_input),
+            "check" => convert_to!(CheckCommand, cmd_input),
+            "unregister" => convert_to!(UnregisterCommand, cmd_input),
+            "rooms" => convert_to!(ListRoomsCommand, cmd_input),
+            "room" => convert_to!(SetRoomCommand, cmd_input),
             _ => Err(CommandParsingError::UnrecognizedCommand(cmd).into()),
         },
         //All other errors passed up.
@@ -280,9 +221,9 @@ mod tests {
 
     #[test]
     fn pool_whitespace_test() {
-        parse_command("!pool ns3:8   ").expect("was error");
-        parse_command("   !pool ns3:8").expect("was error");
-        parse_command("   !pool ns3:8   ").expect("was error");
+        parse_command("!pool 8   ns3    ").expect("was error");
+        parse_command("   !pool 8 ns3").expect("was error");
+        parse_command("   !pool 8   ns3    ").expect("was error");
     }
 
     #[test]

dicebot/src/commands/rooms.rs

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

dicebot/src/commands/variables.rs

@@ -2,10 +2,20 @@ use super::{Command, Execution, ExecutionResult};
 use crate::context::Context;
 use crate::db::errors::DataError;
 use crate::db::Variables;
+use crate::error::BotError;
 use async_trait::async_trait;
+use std::convert::TryFrom;
 
 pub struct GetAllVariablesCommand;
 
+impl TryFrom<String> for GetAllVariablesCommand {
+    type Error = BotError;
+
+    fn try_from(_: String) -> Result<Self, Self::Error> {
+        Ok(GetAllVariablesCommand)
+    }
+}
+
 #[async_trait]
 impl Command for GetAllVariablesCommand {
     fn name(&self) -> &'static str {
@@ -19,7 +29,7 @@ impl Command for GetAllVariablesCommand {
     async fn execute(&self, ctx: &Context<'_>) -> ExecutionResult {
         let variables = ctx
             .db
-            .get_user_variables(&ctx.username, ctx.room_id().as_str())
+            .get_user_variables(&ctx.username, ctx.active_room_id().as_str())
             .await?;
 
         let mut variable_list: Vec<String> = variables
@@ -41,6 +51,14 @@ 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 {
@@ -55,7 +73,7 @@ impl Command for GetVariableCommand {
         let name = &self.0;
         let result = ctx
             .db
-            .get_user_variable(&ctx.username, ctx.room_id().as_str(), name)
+            .get_user_variable(&ctx.username, ctx.active_room_id().as_str(), name)
             .await;
 
         let value = match result {
@@ -71,6 +89,15 @@ 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 {
@@ -86,7 +113,7 @@ impl Command for SetVariableCommand {
         let value = self.1;
 
         ctx.db
-            .set_user_variable(&ctx.username, ctx.room_id().as_str(), name, value)
+            .set_user_variable(&ctx.username, ctx.active_room_id().as_str(), name, value)
             .await?;
 
         let content = format!("{} = {}", name, value);
@@ -97,6 +124,14 @@ 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 {
@@ -111,7 +146,7 @@ impl Command for DeleteVariableCommand {
         let name = &self.0;
         let result = ctx
             .db
-            .delete_user_variable(&ctx.username, ctx.room_id().as_str(), name)
+            .delete_user_variable(&ctx.username, ctx.active_room_id().as_str(), name)
             .await;
 
         let value = match result {

dicebot/src/config.rs

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

dicebot/src/context.rs

@@ -1,7 +1,8 @@
 use crate::db::sqlite::Database;
 use crate::error::BotError;
-use matrix_sdk::identifiers::{RoomId, UserId};
+use crate::models::Account;
 use matrix_sdk::room::Joined;
+use matrix_sdk::ruma::{RoomId, UserId};
 use matrix_sdk::Client;
 use std::convert::TryFrom;
 
@@ -10,19 +11,25 @@ use std::convert::TryFrom;
 #[derive(Clone)]
 pub struct Context<'a> {
     pub db: Database,
-    pub matrix_client: &'a Client,
-    pub room: RoomContext<'a>,
+    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.room.id
+        self.origin_room.id
     }
 
     pub fn is_secure(&self) -> bool {
-        self.room.secure
+        self.origin_room.secure
     }
 }
 
@@ -36,15 +43,22 @@ pub struct RoomContext<'a> {
 impl RoomContext<'_> {
     pub async fn new_with_name<'a>(
         room: &'a Joined,
-        display_name: String,
         sending_user: &str,
     ) -> Result<RoomContext<'a>, BotError> {
-        // TODO is_direct is a hack; should set rooms to Direct
-        // Message upon joining, if other contact has requested it.
-        // Waiting on SDK support.
-        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.joined_members().await?.len() == 2;
+        // TODO is_direct is a hack; the bot should set eligible rooms
+        // to Direct Message upon joining, if other contact has
+        // requested it. Waiting on SDK support.
+        let display_name =
+            room
+            .display_name()
+            .await
+            .ok()
+            .map(|d| d.to_string())
+            .unwrap_or_default();
+
+        let sending_user = <&UserId>::try_from(sending_user)?;
+        let user_in_room = room.get_member(sending_user).await.ok().is_some();
+        let is_direct = room.active_members().await?.len() == 2;
 
         Ok(RoomContext {
             id: room.room_id(),
@@ -55,17 +69,8 @@ impl RoomContext<'_> {
 
     pub async fn new<'a>(
         room: &'a Joined,
-        sending_user: &str,
+        sending_user: &'a str,
     ) -> Result<RoomContext<'a>, BotError> {
-        Self::new_with_name(
-            &room,
-            room.display_name()
-                .await
-                .ok()
-                .unwrap_or_default()
-                .to_string(),
-            sending_user,
-        )
-        .await
+        Self::new_with_name(room, sending_user).await
     }
 }

dicebot/src/cthulhu/dice.rs

@@ -270,7 +270,7 @@ macro_rules! is_variable {
                 element: Element::Variable(_),
                 ..
             }
-        );
+        )
     };
 }
 
@@ -380,7 +380,12 @@ async fn update_skill(ctx: &Context<'_>, variable: &str, value: u32) -> Result<(
     use std::convert::TryInto;
     let value: i32 = value.try_into()?;
     ctx.db
-        .set_user_variable(&ctx.username, &ctx.room_id().as_str(), variable, value)
+        .set_user_variable(
+            &ctx.username,
+            &ctx.active_room_id().as_str(),
+            variable,
+            value,
+        )
         .await?;
     Ok(())
 }
@@ -422,11 +427,12 @@ mod tests {
     use crate::db::sqlite::Database;
     use crate::parser::dice::{Amount, Element, Operator};
     use url::Url;
+    use matrix_sdk::ruma::room_id;
 
     macro_rules! dummy_room {
         () => {
             crate::context::RoomContext {
-                id: &matrix_sdk::identifiers::room_id!("!fakeroomid:example.com"),
+                id: &room_id!("!fakeroomid:example.com"),
                 display_name: "displayname".to_owned(),
                 secure: false,
             }
@@ -504,9 +510,11 @@ mod tests {
 
         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(),
-            room: dummy_room!(),
+            matrix_client: matrix_sdk::Client::new(homeserver).await.unwrap(),
+            origin_room: dummy_room!(),
+            active_room: dummy_room!(),
             username: "username",
             message_body: "message",
         };
@@ -540,9 +548,11 @@ mod tests {
 
         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(),
-            room: dummy_room!(),
+            matrix_client: matrix_sdk::Client::new(homeserver).await.unwrap(),
+            origin_room: dummy_room!(),
+            active_room: dummy_room!(),
             username: "username",
             message_body: "message",
         };
@@ -576,9 +586,11 @@ mod tests {
 
         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(),
-            room: dummy_room!(),
+            matrix_client: matrix_sdk::Client::new(homeserver).await.unwrap(),
+            origin_room: dummy_room!(),
+            active_room: dummy_room!(),
             username: "username",
             message_body: "message",
         };

dicebot/src/cthulhu/parser.rs

@@ -4,16 +4,13 @@ use crate::parser::dice::DiceParsingError;
 //TOOD convert these to use parse_amounts from the common dice code.
 
 fn parse_modifier(input: &str) -> Result<DiceRollModifier, DiceParsingError> {
-    if input.ends_with("bb") {
-        Ok(DiceRollModifier::TwoBonus)
-    } else if input.ends_with("b") {
-        Ok(DiceRollModifier::OneBonus)
-    } else if input.ends_with("pp") {
-        Ok(DiceRollModifier::TwoPenalty)
-    } else if input.ends_with("p") {
-        Ok(DiceRollModifier::OnePenalty)
-    } else {
-        Ok(DiceRollModifier::Normal)
+    match input.trim() {
+        "bb" => Ok(DiceRollModifier::TwoBonus),
+        "b" => Ok(DiceRollModifier::OneBonus),
+        "pp" => Ok(DiceRollModifier::TwoPenalty),
+        "p" => Ok(DiceRollModifier::OnePenalty),
+        "" => Ok(DiceRollModifier::Normal),
+        _ => Err(DiceParsingError::InvalidModifiers),
     }
 }
 
@@ -21,32 +18,70 @@ fn parse_modifier(input: &str) -> Result<DiceRollModifier, DiceParsingError> {
 //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();
-
-    let (modifiers_str, amounts_str) = match input[..] {
-        [amounts] => Ok(("", amounts)),
-        [modifiers, amounts] => Ok((modifiers, amounts)),
-        _ => Err(DiceParsingError::UnconsumedInput),
-    }?;
-
+    let (amount, modifiers_str) = crate::parser::dice::parse_single_amount(input)?;
     let modifier = parse_modifier(modifiers_str)?;
-    let amount = crate::parser::dice::parse_single_amount(amounts_str)?;
     Ok(DiceRoll { modifier, amount })
 }
 
 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, unconsumed_input) = crate::parser::dice::parse_single_amount(input)?;
 
-    Ok(AdvancementRoll {
-        existing_skill: amounts,
-    })
+    if unconsumed_input.len() == 0 {
+        Ok(AdvancementRoll {
+            existing_skill: amounts,
+        })
+    } else {
+        Err(DiceParsingError::InvalidAmount)
+    }
 }
 
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::parser::dice::{Amount, Element, Operator};
+    use crate::parser::dice::{Amount, DiceParsingError, Element, Operator};
+
+    #[test]
+    fn parse_modifier_rejects_bad_value() {
+        let modifier = parse_modifier("qqq");
+        assert!(matches!(modifier, Err(DiceParsingError::InvalidModifiers)))
+    }
+
+    #[test]
+    fn parse_modifier_accepts_one_bonus() {
+        let modifier = parse_modifier("b");
+        assert!(matches!(modifier, Ok(DiceRollModifier::OneBonus)))
+    }
+
+    #[test]
+    fn parse_modifier_accepts_two_bonus() {
+        let modifier = parse_modifier("bb");
+        assert!(matches!(modifier, Ok(DiceRollModifier::TwoBonus)))
+    }
+
+    #[test]
+    fn parse_modifier_accepts_two_penalty() {
+        let modifier = parse_modifier("pp");
+        assert!(matches!(modifier, Ok(DiceRollModifier::TwoPenalty)))
+    }
+
+    #[test]
+    fn parse_modifier_accepts_one_penalty() {
+        let modifier = parse_modifier("p");
+        assert!(matches!(modifier, Ok(DiceRollModifier::OnePenalty)))
+    }
+
+    #[test]
+    fn parse_modifier_accepts_normal() {
+        let modifier = parse_modifier("");
+        assert!(matches!(modifier, Ok(DiceRollModifier::Normal)))
+    }
+
+    #[test]
+    fn parse_modifier_accepts_normal_unaffected_by_whitespace() {
+        let modifier = parse_modifier("         ");
+        assert!(matches!(modifier, Ok(DiceRollModifier::Normal)))
+    }
 
     #[test]
     fn regular_roll_accepts_single_number() {
@@ -72,7 +107,7 @@ mod tests {
 
     #[test]
     fn regular_roll_accepts_two_bonus() {
-        let result = parse_regular_roll("bb:60");
+        let result = parse_regular_roll("60 bb");
         assert!(result.is_ok());
         assert_eq!(
             DiceRoll {
@@ -88,7 +123,7 @@ mod tests {
 
     #[test]
     fn regular_roll_accepts_one_bonus() {
-        let result = parse_regular_roll("b:60");
+        let result = parse_regular_roll("60 b");
         assert!(result.is_ok());
         assert_eq!(
             DiceRoll {
@@ -104,7 +139,7 @@ mod tests {
 
     #[test]
     fn regular_roll_accepts_two_penalty() {
-        let result = parse_regular_roll("pp:60");
+        let result = parse_regular_roll("60 pp");
         assert!(result.is_ok());
         assert_eq!(
             DiceRoll {
@@ -120,7 +155,7 @@ mod tests {
 
     #[test]
     fn regular_roll_accepts_one_penalty() {
-        let result = parse_regular_roll("p:60");
+        let result = parse_regular_roll("60 p");
         assert!(result.is_ok());
         assert_eq!(
             DiceRoll {
@@ -140,21 +175,21 @@ mod tests {
         assert!(parse_regular_roll("   60").is_ok());
         assert!(parse_regular_roll("   60    ").is_ok());
 
-        assert!(parse_regular_roll("bb:60     ").is_ok());
-        assert!(parse_regular_roll("   bb:60").is_ok());
-        assert!(parse_regular_roll("   bb:60    ").is_ok());
+        assert!(parse_regular_roll("60bb     ").is_ok());
+        assert!(parse_regular_roll("   60 bb").is_ok());
+        assert!(parse_regular_roll("   60   bb    ").is_ok());
 
-        assert!(parse_regular_roll("b:60     ").is_ok());
-        assert!(parse_regular_roll("   b:60").is_ok());
-        assert!(parse_regular_roll("   b:60    ").is_ok());
+        assert!(parse_regular_roll("60b     ").is_ok());
+        assert!(parse_regular_roll("   60 b").is_ok());
+        assert!(parse_regular_roll("   60  b    ").is_ok());
 
-        assert!(parse_regular_roll("pp:60     ").is_ok());
-        assert!(parse_regular_roll("   pp:60").is_ok());
-        assert!(parse_regular_roll("   pp:60    ").is_ok());
+        assert!(parse_regular_roll("60pp     ").is_ok());
+        assert!(parse_regular_roll("   60 pp").is_ok());
+        assert!(parse_regular_roll("   60 pp   ").is_ok());
 
-        assert!(parse_regular_roll("p:60     ").is_ok());
-        assert!(parse_regular_roll("   p:60").is_ok());
-        assert!(parse_regular_roll("   p:60    ").is_ok());
+        assert!(parse_regular_roll("60p     ").is_ok());
+        assert!(parse_regular_roll("   60p  ").is_ok());
+        assert!(parse_regular_roll("   60  p    ").is_ok());
     }
 
     #[test]

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

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

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

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

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

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

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

@@ -0,0 +1 @@
+

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

@@ -5,7 +5,7 @@ use sqlx::ConnectOptions;
 use std::str::FromStr;
 use thiserror::Error;
 
-pub mod migrations;
+//pub mod migrations;
 
 #[derive(Error, Debug)]
 pub enum MigrationError {
@@ -16,6 +16,11 @@ pub enum MigrationError {
     RefineryError(#[from] refinery::Error),
 }
 
+mod embedded {
+    use refinery::embed_migrations;
+    embed_migrations!("src/db/sqlite/migrator/migrations");
+}
+
 /// Run database migrations against the sqlite database.
 pub async fn migrate(db_path: &str) -> Result<(), MigrationError> {
     //Create database if missing.
@@ -28,6 +33,6 @@ pub async fn migrate(db_path: &str) -> Result<(), MigrationError> {
 
     let mut conn = Config::new(ConfigDbType::Sqlite).set_db_path(db_path);
     info!("Running migrations");
-    migrations::runner().run(&mut conn)?;
+    embedded::migrations::runner().run(&mut conn)?;
     Ok(())
 }

dicebot/src/db/sqlite/rooms.rs

@@ -53,34 +53,41 @@ impl Rooms for Database {
 mod tests {
     use crate::db::sqlite::Database;
     use crate::db::Rooms;
+    use std::future::Future;
 
-    async fn create_db() -> Database {
+    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();
 
-        Database::new(db_path.path().to_str().unwrap())
+        let db = Database::new(db_path.path().to_str().unwrap())
             .await
-            .unwrap()
+            .unwrap();
+
+        f(db).await;
     }
 
     #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
     async fn should_process_test() {
-        let db = create_db().await;
+        with_db(|db| async move {
+            let first_check = db
+                .should_process("myroom", "myeventid")
+                .await
+                .expect("should_process failed in first insert");
 
-        let first_check = db
-            .should_process("myroom", "myeventid")
-            .await
-            .expect("should_process failed in first insert");
+            assert_eq!(first_check, true);
 
-        assert_eq!(first_check, true);
+            let second_check = db
+                .should_process("myroom", "myeventid")
+                .await
+                .expect("should_process failed in first insert");
 
-        let second_check = db
-            .should_process("myroom", "myeventid")
-            .await
-            .expect("should_process failed in first insert");
-
-        assert_eq!(second_check, false);
+            assert_eq!(second_check, false);
+        })
+        .await;
     }
 }

dicebot/src/db/sqlite/state.rs

@@ -37,54 +37,64 @@ impl DbState for Database {
 mod tests {
     use crate::db::sqlite::Database;
     use crate::db::DbState;
+    use std::future::Future;
 
-    async fn create_db() -> Database {
+    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();
 
-        Database::new(db_path.path().to_str().unwrap())
+        let db = Database::new(db_path.path().to_str().unwrap())
             .await
-            .unwrap()
+            .unwrap();
+
+        f(db).await;
     }
 
     #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
     async fn set_and_get_device_id() {
-        let db = create_db().await;
+        with_db(|db| async move {
+            db.set_device_id("device_id")
+                .await
+                .expect("Could not set device ID");
 
-        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");
 
-        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");
+            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() {
-        let db = create_db().await;
-        let device_id = db.get_device_id().await.expect("Could not get device ID");
-        assert!(device_id.is_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() {
-        let db = create_db().await;
+        with_db(|db| async move {
+            db.set_device_id("device_id")
+                .await
+                .expect("Could not set device ID");
 
-        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");
 
-        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");
 
-        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");
+            assert!(device_id.is_some());
+            assert_eq!(device_id.unwrap(), "device_id2");
+        })
+        .await;
     }
 }

dicebot/src/db/sqlite/users.rs

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

dicebot/src/db/sqlite/variables.rs

@@ -102,143 +102,156 @@ mod tests {
     use super::*;
     use crate::db::sqlite::Database;
     use crate::db::Variables;
+    use std::future::Future;
 
-    async fn create_db() -> Database {
+    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();
 
-        Database::new(db_path.path().to_str().unwrap())
+        let db = Database::new(db_path.path().to_str().unwrap())
             .await
-            .unwrap()
+            .unwrap();
+
+        f(db).await;
     }
 
     #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
     async fn set_and_get_variable_test() {
-        let db = create_db().await;
+        with_db(|db| async move {
+            db.set_user_variable("myuser", "myroom", "myvariable", 1)
+                .await
+                .expect("Could not set variable");
 
-        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");
 
-        let value = db
-            .get_user_variable("myuser", "myroom", "myvariable")
-            .await
-            .expect("Could not get variable");
-
-        assert_eq!(value, 1);
+            assert_eq!(value, 1);
+        })
+        .await;
     }
 
     #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
     async fn get_missing_variable_test() {
-        let db = create_db().await;
+        with_db(|db| async move {
+            let value = db.get_user_variable("myuser", "myroom", "myvariable").await;
 
-        let value = db.get_user_variable("myuser", "myroom", "myvariable").await;
-
-        assert!(value.is_err());
-        assert!(matches!(
-            value.err().unwrap(),
-            DataError::KeyDoesNotExist(_)
-        ));
+            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() {
-        let db = create_db().await;
+        with_db(|db| async move {
+            db.set_user_variable("myuser1", "myroom", "myvariable", 1)
+                .await
+                .expect("Could not set variable");
 
-        db.set_user_variable("myuser1", "myroom", "myvariable", 1)
-            .await
-            .expect("Could not set variable");
+            let value = db
+                .get_user_variable("myuser2", "myroom", "myvariable")
+                .await;
 
-        let value = db
-            .get_user_variable("myuser2", "myroom", "myvariable")
-            .await;
-
-        assert!(value.is_err());
-        assert!(matches!(
-            value.err().unwrap(),
-            DataError::KeyDoesNotExist(_)
-        ));
+            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() {
-        let db = create_db().await;
+        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");
+            }
 
-        for variable_name in &["var1", "var2", "var3"] {
-            db.set_user_variable("myuser", "myroom", variable_name, 1)
+            let count = db
+                .get_variable_count("myuser", "myroom")
                 .await
-                .expect("Could not set variable");
-        }
+                .expect("Could not get count.");
 
-        let count = db
-            .get_variable_count("myuser", "myroom")
-            .await
-            .expect("Could not get count.");
-
-        assert_eq!(count, 3);
+            assert_eq!(count, 3);
+        })
+        .await;
     }
 
     #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
     async fn count_variables_respects_user_id() {
-        let db = create_db().await;
+        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");
+            }
 
-        for variable_name in &["var1", "var2", "var3"] {
-            db.set_user_variable("different-user", "myroom", variable_name, 1)
+            let count = db
+                .get_variable_count("myuser", "myroom")
                 .await
-                .expect("Could not set variable");
-        }
+                .expect("Could not get count.");
 
-        let count = db
-            .get_variable_count("myuser", "myroom")
-            .await
-            .expect("Could not get count.");
-
-        assert_eq!(count, 0);
+            assert_eq!(count, 0);
+        })
+        .await;
     }
 
     #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
     async fn count_variables_respects_room_id() {
-        let db = create_db().await;
+        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");
+            }
 
-        for variable_name in &["var1", "var2", "var3"] {
-            db.set_user_variable("myuser", "different-room", variable_name, 1)
+            let count = db
+                .get_variable_count("myuser", "myroom")
                 .await
-                .expect("Could not set variable");
-        }
+                .expect("Could not get count.");
 
-        let count = db
-            .get_variable_count("myuser", "myroom")
-            .await
-            .expect("Could not get count.");
-
-        assert_eq!(count, 0);
+            assert_eq!(count, 0);
+        })
+        .await;
     }
 
     #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
     async fn delete_variable_test() {
-        let db = create_db().await;
+        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");
+            }
 
-        for variable_name in &["var1", "var2", "var3"] {
-            db.set_user_variable("myuser", "myroom", variable_name, 1)
+            db.delete_user_variable("myuser", "myroom", "var1")
                 .await
-                .expect("Could not set variable");
-        }
+                .expect("Could not delete 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");
 
-        let count = db
-            .get_variable_count("myuser", "myroom")
-            .await
-            .expect("Could not get count");
+            assert_eq!(count, 2);
 
-        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(_)));
+            let var1 = db.get_user_variable("myuser", "myroom", "var1").await;
+            assert!(var1.is_err());
+            assert!(matches!(var1.err().unwrap(), DataError::KeyDoesNotExist(_)));
+        })
+        .await;
     }
 }

dicebot/src/error.rs

@@ -1,7 +1,10 @@
+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 {
@@ -15,6 +18,12 @@ pub enum BotError {
     #[error("could not retrieve device id")]
     NoDeviceIdFound,
 
+    #[error("could not build client: {0}")]
+    ClientBuildError(#[from] matrix_sdk::ClientBuildError),
+
+    #[error("could not open matrix store: {0}")]
+    OpenStoreError(#[from] matrix_sdk::store::OpenStoreError),
+
     #[error("command error: {0}")]
     CommandError(#[from] CommandError),
 
@@ -30,15 +39,15 @@ pub enum BotError {
     #[error("could not parse URL")]
     UrlParseError(#[from] url::ParseError),
 
+    #[error("could not parse ID")]
+    IdParseError(#[from] matrix_sdk::ruma::IdParseError),
+
     #[error("error in matrix state store: {0}")]
     MatrixStateStoreError(#[from] matrix_sdk::StoreError),
 
     #[error("uncategorized matrix SDK error: {0}")]
     MatrixError(#[from] matrix_sdk::Error),
 
-    #[error("uncategorized matrix SDK base error: {0}")]
-    MatrixBaseError(#[from] matrix_sdk::BaseError),
-
     #[error("future canceled")]
     FutureCanceledError,
 
@@ -76,8 +85,8 @@ pub enum BotError {
     #[error("could not convert to proper integer type")]
     TryFromIntError(#[from] std::num::TryFromIntError),
 
-    #[error("identifier error: {0}")]
-    IdentifierError(#[from] matrix_sdk::identifiers::Error),
+    // #[error("identifier error: {0}")]
+    // IdentifierError(#[from] matrix_sdk::ruma::Error),
 
     #[error("password creation error: {0}")]
     PasswordCreationError(argon2::Error),
@@ -87,6 +96,21 @@ pub enum BotError {
 
     #[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)]

dicebot/src/help.rs

@@ -6,6 +6,9 @@ pub fn parse_help_topic(input: &str) -> Option<HelpTopic> {
         "dicepool" => Some(HelpTopic::DicePool),
         "dice" => Some(HelpTopic::RollingDice),
         "cthulhu" => Some(HelpTopic::Cthulhu),
+        "variables" => Some(HelpTopic::Variables),
+        "var" => Some(HelpTopic::Variables),
+        "variable" => Some(HelpTopic::Variables),
         "" => Some(HelpTopic::General),
         _ => None,
     }
@@ -16,6 +19,7 @@ pub enum HelpTopic {
     DicePool,
     Cthulhu,
     RollingDice,
+    Variables,
     General,
 }
 
@@ -101,6 +105,34 @@ Note: If !cthadv is given a variable, and the roll is successful, it will
 update the variable with the new skill.
 "};
 
+const VARIABLES_HELP: &'static str = indoc! {"
+Variables
+
+Commands: !get, !set, !variables
+
+Manage variables that can be substituted into roll commands.
+
+Examples: !get myvar, !set myvar 10
+
+!get <variable> = show variable of the given name
+!set <variable> <num> = set a variable to a number
+
+The !variables command will list all variables for the room. The
+variables command cna be used in a secure room to avoid spamming the
+actual room that the variable is set in.
+
+Variable names can be used in all types of dice rolls:
+
+!pool myvar + 3
+!roll myvar
+
+There are some limitations on variables: they cannot themselves be
+dice expressions (i.e. can only be numbers), and they must be uniquely
+parseable in an expression (i.e 'myvard6' does not work for the !roll
+command).
+
+"};
+
 const GENERAL_HELP: &'static str = indoc! {"
 General Help
 
@@ -117,6 +149,7 @@ impl HelpTopic {
             HelpTopic::DicePool => DICEPOOL_HELP,
             HelpTopic::Cthulhu => CTHULHU_HELP,
             HelpTopic::RollingDice => DICE_HELP,
+            HelpTopic::Variables => VARIABLES_HELP,
             HelpTopic::General => GENERAL_HELP,
         }
     }

dicebot/src/lib.rs

@@ -12,4 +12,6 @@ pub mod logic;
 pub mod matrix;
 pub mod models;
 mod parser;
+pub mod rpc;
 pub mod state;
+pub mod systems;

dicebot/src/logic.rs

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

dicebot/src/matrix.rs

@@ -1,14 +1,22 @@
+use std::path::PathBuf;
+
 use futures::stream::{self, StreamExt, TryStreamExt};
 use log::error;
-use matrix_sdk::{events::room::message::NoticeMessageEventContent, room::Joined};
-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 matrix_sdk::ruma::events::room::message::{InReplyTo, RoomMessageEventContent, Relation};
+use matrix_sdk::ruma::events::AnyMessageLikeEventContent;
+use matrix_sdk::ruma::{RoomId, OwnedEventId, OwnedUserId};
+use matrix_sdk::Client;
+use matrix_sdk::Error as MatrixError;
+use matrix_sdk::room::Joined;
+use url::Url;
+
+use crate::{config::Config, error::BotError};
+
+fn cache_dir() -> Result<PathBuf, BotError> {
+    let mut dir = dirs::cache_dir().ok_or(BotError::NoCacheDirectoryError)?;
+    dir.push("matrix-dicebot");
+    Ok(dir)
+}
 
 /// Extracts more detailed error messages out of a matrix SDK error.
 fn extract_error_message(error: MatrixError) -> String {
@@ -20,6 +28,19 @@ fn extract_error_message(error: MatrixError) -> String {
     }
 }
 
+/// Creates the matrix client.
+pub async fn create_client(config: &Config) -> Result<Client, BotError> {
+    let cache_dir = cache_dir()?;
+    let homeserver_url = Url::parse(&config.matrix_homeserver())?;
+
+    let client = Client::builder()
+        .sled_store(cache_dir, None)?
+        .homeserver_url(homeserver_url).build()
+        .await?;
+
+    Ok(client)
+}
+
 /// Retrieve a list of users in a given room.
 pub async fn get_users_in_room(
     client: &Client,
@@ -39,7 +60,7 @@ pub async fn get_users_in_room(
 
 pub async fn get_rooms_for_user(
     client: &Client,
-    user: &UserId,
+    user: &OwnedUserId,
 ) -> Result<Vec<Joined>, MatrixError> {
     // Carries errors through, in case we cannot load joined user IDs
     // from the room for some reason.
@@ -61,32 +82,32 @@ pub async fn get_rooms_for_user(
     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,
-    reply_to: Option<EventId>,
+    message: (&str, &str),
+    reply_to: Option<OwnedEventId>,
 ) {
+    let (html, plain) = message;
     let room = match client.get_joined_room(room_id) {
         Some(room) => room,
         _ => return,
     };
 
-    let plain = html2text::from_read(message.as_bytes(), message.len());
-    let mut content = MessageEventContent::new(MessageType::Notice(
-        NoticeMessageEventContent::html(plain.trim(), message),
-    ));
+    let mut content = RoomMessageEventContent::notice_html(plain.trim(), html);
 
     content.relates_to = reply_to.map(|event_id| Relation::Reply {
-        in_reply_to: InReplyTo::new(event_id),
+        in_reply_to: InReplyTo::new(event_id)
     });
 
-    let content = AnyMessageEventContent::RoomMessage(content);
+    let content = AnyMessageLikeEventContent::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);
+        let html = extract_error_message(e);
+        error!("Error sending html: {}", html);
     };
 }

dicebot/src/models.rs

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

dicebot/src/parser/dice.rs

@@ -151,8 +151,9 @@ 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.
-pub fn parse_amounts(input: &str) -> ParseResult<Vec<Amount>> {
+/// deal with XdY rolls. Support for that will be added later. Returns
+/// parsed amounts and unconsumed input (e.g. roll modifiers).
+pub fn parse_amounts(input: &str) -> ParseResult<(Vec<Amount>, &str)> {
     let input = input.trim();
 
     let remaining_amounts = many(amount_parser()).map(|amounts: Vec<ParseResult<Amount>>| amounts);
@@ -169,31 +170,23 @@ pub fn parse_amounts(input: &str) -> ParseResult<Vec<Amount>> {
             (amounts, results.1)
         })?;
 
-    if rest.len() == 0 {
-        // Any ParseResult errors will short-circuit the collect.
-        results.into_iter().collect()
-    } else {
-        Err(DiceParsingError::UnconsumedInput)
-    }
+    // Any ParseResult errors will short-circuit the collect.
+    let results: Vec<Amount> = results.into_iter().collect::<ParseResult<_>>()?;
+    Ok((results, rest))
 }
 
 /// Parse an expression that expects a single number or variable. No
 /// operators are allowed. This function is common to systems that
 /// don't deal with XdY rolls. Currently. this function does not
-/// support parsing negative numbers.
-pub fn parse_single_amount(input: &str) -> ParseResult<Amount> {
+/// support parsing negative numbers. Returns the parsed amount and
+/// any unconsumed input (useful for dice roll modifiers).
+pub fn parse_single_amount(input: &str) -> ParseResult<(Amount, &str)> {
     // TODO add support for negative numbers, as technically they
     // should be allowed.
     let input = input.trim();
     let mut parser = first_amount_parser().map(|amount: ParseResult<Amount>| amount);
-
     let (result, rest) = parser.parse(input)?;
-
-    if rest.len() == 0 {
-        result
-    } else {
-        Err(DiceParsingError::UnconsumedInput)
-    }
+    Ok((result?, rest))
 }
 
 #[cfg(test)]
@@ -206,10 +199,13 @@ mod parse_single_amount_tests {
         assert!(result.is_ok());
         assert_eq!(
             result.unwrap(),
-            Amount {
-                operator: Operator::Plus,
-                element: Element::Variable("abc".to_string())
-            }
+            (
+                Amount {
+                    operator: Operator::Plus,
+                    element: Element::Variable("abc".to_string())
+                },
+                ""
+            )
         )
     }
 
@@ -233,24 +229,15 @@ mod parse_single_amount_tests {
         assert!(result.is_ok());
         assert_eq!(
             result.unwrap(),
-            Amount {
-                operator: Operator::Plus,
-                element: Element::Number(1)
-            }
+            (
+                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)]
@@ -263,20 +250,26 @@ mod parse_many_amounts_tests {
         assert!(result.is_ok());
         assert_eq!(
             result.unwrap(),
-            vec![Amount {
-                operator: Operator::Plus,
-                element: Element::Number(1)
-            }]
+            (
+                vec![Amount {
+                    operator: Operator::Plus,
+                    element: Element::Number(1)
+                }],
+                ""
+            )
         );
 
         let result = parse_amounts("10");
         assert!(result.is_ok());
         assert_eq!(
             result.unwrap(),
-            vec![Amount {
-                operator: Operator::Plus,
-                element: Element::Number(10)
-            }]
+            (
+                vec![Amount {
+                    operator: Operator::Plus,
+                    element: Element::Number(10)
+                }],
+                ""
+            )
         );
     }
 
@@ -295,20 +288,26 @@ mod parse_many_amounts_tests {
         assert!(result.is_ok());
         assert_eq!(
             result.unwrap(),
-            vec![Amount {
-                operator: Operator::Plus,
-                element: Element::Variable("asdf".to_string())
-            }]
+            (
+                vec![Amount {
+                    operator: Operator::Plus,
+                    element: Element::Variable("asdf".to_string())
+                }],
+                ""
+            )
         );
 
         let result = parse_amounts("nosis");
         assert!(result.is_ok());
         assert_eq!(
             result.unwrap(),
-            vec![Amount {
-                operator: Operator::Plus,
-                element: Element::Variable("nosis".to_string())
-            }]
+            (
+                vec![Amount {
+                    operator: Operator::Plus,
+                    element: Element::Variable("nosis".to_string())
+                }],
+                ""
+            )
         );
     }
 

dicebot/src/rpc/mod.rs

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

dicebot/src/rpc/service.rs

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

dicebot/src/systems/mod.rs

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

rpc/Cargo.toml

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

rpc/build.rs

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

rpc/protos/dicebot.proto

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

rpc/src/lib.rs

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

src/basic/parser.rs

@@ -1,189 +0,0 @@
-/**
- * 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,
-    sequence::tuple, tag, IResult,
-};
-
-use super::dice::*;
-
-//******************************
-//Legacy Code
-//******************************
-
-fn is_whitespace(input: char) -> bool {
-    input == ' ' || input == '\n' || input == '\t' || input == '\r'
-}
-
-/// Eat whitespace, returning it
-pub fn eat_whitespace(input: &str) -> IResult<&str, &str> {
-    let (input, whitespace) = take_while(is_whitespace)(input)?;
-    Ok((input, whitespace))
-}
-
-#[derive(Debug, PartialEq, Eq, Clone, Copy)]
-enum Sign {
-    Plus,
-    Minus,
-}
-
-// Parse a dice expression.  Does not eat whitespace
-fn parse_dice(input: &str) -> IResult<&str, Dice> {
-    let (input, (count, _, sides)) = tuple((digit1, tag("d"), digit1))(input)?;
-    Ok((
-        input,
-        Dice::new(count.parse().unwrap(), sides.parse().unwrap()),
-    ))
-}
-
-// Parse a single digit expression.  Does not eat whitespace
-fn parse_bonus(input: &str) -> IResult<&str, u32> {
-    let (input, bonus) = digit1(input)?;
-    Ok((input, bonus.parse().unwrap()))
-}
-
-// Parse a sign expression.  Eats whitespace.
-fn parse_sign(input: &str) -> IResult<&str, Sign> {
-    let (input, _) = eat_whitespace(input)?;
-    named!(sign(&str) -> Sign, alt!(
-            complete!(tag!("+")) => { |_| Sign::Plus } |
-            complete!(tag!("-")) => { |_| Sign::Minus }
-    ));
-
-    let (input, sign) = sign(input)?;
-    Ok((input, sign))
-}
-
-// Parse an element expression.  Eats whitespace.
-fn parse_element(input: &str) -> IResult<&str, Element> {
-    let (input, _) = eat_whitespace(input)?;
-    named!(element(&str) -> Element, alt!(
-            parse_dice => { |d| Element::Dice(d) } |
-            parse_bonus => { |b| Element::Bonus(b) }
-    ));
-
-    let (input, element) = element(input)?;
-    Ok((input, element))
-}
-
-// Parse a signed element expression.  Eats whitespace.
-fn parse_signed_element(input: &str) -> IResult<&str, SignedElement> {
-    let (input, _) = eat_whitespace(input)?;
-    let (input, sign) = parse_sign(input)?;
-    let (input, _) = eat_whitespace(input)?;
-
-    let (input, element) = parse_element(input)?;
-    let element = match sign {
-        Sign::Plus => SignedElement::Positive(element),
-        Sign::Minus => SignedElement::Negative(element),
-    };
-    Ok((input, element))
-}
-
-// Parse a full element expression.  Eats whitespace.
-pub fn parse_element_expression(input: &str) -> IResult<&str, ElementExpression> {
-    named!(first_element(&str) -> SignedElement, alt!(
-            parse_signed_element => { |e| e } |
-            parse_element => { |e| SignedElement::Positive(e) }
-    ));
-    let (input, first) = first_element(input)?;
-    let (input, rest) = if input.trim().is_empty() {
-        (input, vec![first])
-    } else {
-        named!(rest_elements(&str) -> Vec<SignedElement>, many0!(parse_signed_element));
-        let (input, mut rest) = rest_elements(input)?;
-        rest.insert(0, first);
-        (input, rest)
-    };
-
-    Ok((input, ElementExpression(rest)))
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-    #[test]
-    fn dice_test() {
-        assert_eq!(parse_dice("2d4"), Ok(("", Dice::new(2, 4))));
-        assert_eq!(parse_dice("20d40"), Ok(("", Dice::new(20, 40))));
-        assert_eq!(parse_dice("8d7"), Ok(("", Dice::new(8, 7))));
-    }
-
-    #[test]
-    fn element_test() {
-        assert_eq!(
-            parse_element("  \t\n\r\n 8d7 \n"),
-            Ok((" \n", Element::Dice(Dice::new(8, 7))))
-        );
-        assert_eq!(
-            parse_element("  \t\n\r\n 8 \n"),
-            Ok((" \n", Element::Bonus(8)))
-        );
-    }
-
-    #[test]
-    fn signed_element_test() {
-        assert_eq!(
-            parse_signed_element("+ 7"),
-            Ok(("", SignedElement::Positive(Element::Bonus(7))))
-        );
-        assert_eq!(
-            parse_signed_element("  \t\n\r\n- 8 \n"),
-            Ok((" \n", SignedElement::Negative(Element::Bonus(8))))
-        );
-        assert_eq!(
-            parse_signed_element("  \t\n\r\n- 8d4 \n"),
-            Ok((
-                " \n",
-                SignedElement::Negative(Element::Dice(Dice::new(8, 4)))
-            ))
-        );
-        assert_eq!(
-            parse_signed_element("  \t\n\r\n+ 8d4 \n"),
-            Ok((
-                " \n",
-                SignedElement::Positive(Element::Dice(Dice::new(8, 4)))
-            ))
-        );
-    }
-
-    #[test]
-    fn element_expression_test() {
-        assert_eq!(
-            parse_element_expression("8d4"),
-            Ok((
-                "",
-                ElementExpression(vec![SignedElement::Positive(Element::Dice(Dice::new(
-                    8, 4
-                )))])
-            ))
-        );
-        assert_eq!(
-            parse_element_expression(" -  8d4 \n "),
-            Ok((
-                " \n ",
-                ElementExpression(vec![SignedElement::Negative(Element::Dice(Dice::new(
-                    8, 4
-                )))])
-            ))
-        );
-        assert_eq!(
-            parse_element_expression("\t3d4 + 7 - 5 - 6d12 + 1d1 + 53 1d5 "),
-            Ok((
-                " 1d5 ",
-                ElementExpression(vec![
-                    SignedElement::Positive(Element::Dice(Dice::new(3, 4))),
-                    SignedElement::Positive(Element::Bonus(7)),
-                    SignedElement::Negative(Element::Bonus(5)),
-                    SignedElement::Negative(Element::Dice(Dice::new(6, 12))),
-                    SignedElement::Positive(Element::Dice(Dice::new(1, 1))),
-                    SignedElement::Positive(Element::Bonus(53)),
-                ])
-            ))
-        );
-    }
-}

src/bot/command_execution.rs

@@ -1,106 +0,0 @@
-use crate::commands::{execute_command, ExecutionError, ExecutionResult, ResponseExtractor};
-use crate::context::{Context, RoomContext};
-use crate::db::sqlite::Database;
-use crate::error::BotError;
-use crate::matrix;
-use futures::stream::{self, StreamExt};
-use matrix_sdk::{self, identifiers::EventId, room::Joined, Client};
-use std::clone::Clone;
-
-/// 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);
-    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).
-pub(super) async fn handle_multiple_results(
-    client: &Client,
-    results: &[(String, ExecutionResult)],
-    respond_to: &str,
-    room: &Joined,
-) {
-    let respond_to = format!(
-        "<a href=\"https://matrix.to/#/{}\">{}</a>",
-        respond_to, respond_to
-    );
-
-    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;
-}
-
-/// Create a context for command execution. Can fai if the room
-/// context creation fails.
-async fn create_context<'a>(
-    db: &'a Database,
-    client: &'a Client,
-    room: &'a Joined,
-    sender: &'a str,
-    command: &'a str,
-) -> Result<Context<'a>, BotError> {
-    let room_ctx = RoomContext::new(room, sender).await?;
-    Ok(Context {
-        db: db.clone(),
-        matrix_client: client,
-        room: room_ctx,
-        username: &sender,
-        message_body: &command,
-    })
-}
-
-/// 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 {
-            match create_context(db, client, room, sender, command).await {
-                Err(e) => (command.to_owned(), Err(ExecutionError(e))),
-                Ok(ctx) => {
-                    let cmd_result = execute_command(&ctx).await;
-                    (command.to_owned(), cmd_result)
-                }
-            }
-        })
-        .collect()
-        .await
-}

src/bot/event_handlers.rs

@@ -1,163 +0,0 @@
-/**
- * In addition to the terms of the AGPL, portions of this file
- * are governed by the terms of the MIT license, from the Rust Matrix
- * SDK example code.
- */
-use super::DiceBot;
-use crate::db::sqlite::Database;
-use crate::db::Rooms;
-use crate::error::BotError;
-use async_trait::async_trait;
-use log::{debug, error, info, warn};
-use matrix_sdk::{
-    self,
-    events::{
-        room::member::MemberEventContent,
-        room::message::{MessageEventContent, MessageType, TextMessageEventContent},
-        StrippedStateEvent, SyncMessageEvent,
-    },
-    room::Room,
-    EventHandler,
-};
-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
-/// returns true. If it's older than that, it returns false and logs a
-/// debug message.
-fn check_message_age(
-    event: &SyncMessageEvent<MessageEventContent>,
-    oldest_message_age: u64,
-) -> bool {
-    let sending_time = event
-        .origin_server_ts
-        .to_system_time()
-        .unwrap_or(UNIX_EPOCH);
-
-    let oldest_timestamp = SystemTime::now().sub(Duration::from_secs(oldest_message_age));
-
-    if sending_time > oldest_timestamp {
-        true
-    } else {
-        let age = match oldest_timestamp.duration_since(sending_time) {
-            Ok(n) => format!("{} seconds too old", n.as_secs()),
-            Err(_) => "before the UNIX epoch".to_owned(),
-        };
-
-        debug!("Ignoring message because it is {}: {:?}", age, event);
-        false
-    }
-}
-
-/// Determine whether or not to process a received message. This check
-/// is necessary in addition to the event processing check because we
-/// may receive message events when entering a room for the first
-/// time, and we don't want to respond to things before the bot was in
-/// the channel, but we do want to respond to things that were sent if
-/// the bot left and rejoined quickly.
-async fn should_process_message<'a>(
-    bot: &DiceBot,
-    event: &SyncMessageEvent<MessageEventContent>,
-) -> Result<(String, String), BotError> {
-    //Ignore messages that are older than configured duration.
-    if !check_message_age(event, bot.config.oldest_message_age()) {
-        let state_check = bot.state.read().unwrap();
-        if !((*state_check).logged_skipped_old_messages()) {
-            drop(state_check);
-            let mut state = bot.state.write().unwrap();
-            (*state).skipped_old_messages();
-        }
-
-        return Err(BotError::ShouldNotProcessError);
-    }
-
-    let (msg_body, sender_username) = if let SyncMessageEvent {
-        content:
-            MessageEventContent {
-                msgtype: MessageType::Text(TextMessageEventContent { body, .. }),
-                ..
-            },
-        sender,
-        ..
-    } = event
-    {
-        (
-            body.clone(),
-            format!("@{}:{}", sender.localpart(), sender.server_name()),
-        )
-    } else {
-        (String::new(), String::new())
-    };
-
-    Ok((msg_body, sender_username))
-}
-
-async fn should_process_event(db: &Database, room_id: &str, event_id: &str) -> bool {
-    db.should_process(room_id, event_id)
-        .await
-        .unwrap_or_else(|e| {
-            error!(
-                "Database error when checking if we should process an event: {}",
-                e.to_string()
-            );
-            false
-        })
-}
-
-/// This event emitter listens for messages with dice rolling commands.
-/// Originally adapted from the matrix-rust-sdk examples.
-#[async_trait]
-impl EventHandler for DiceBot {
-    async fn on_stripped_state_member(
-        &self,
-        room: Room,
-        event: &StrippedStateEvent<MemberEventContent>,
-        _: Option<MemberEventContent>,
-    ) {
-        let room = match room {
-            Room::Invited(invited_room) => invited_room,
-            _ => return,
-        };
-
-        if room.own_user_id().as_str() != event.state_key {
-            return;
-        }
-
-        info!(
-            "Autojoining room {}",
-            room.display_name().await.ok().unwrap_or_default()
-        );
-
-        if let Err(e) = self.client.join_room_by_id(&room.room_id()).await {
-            warn!("Could not join room: {}", e.to_string())
-        }
-    }
-
-    async fn on_room_message(&self, room: Room, event: &SyncMessageEvent<MessageEventContent>) {
-        let room = match room {
-            Room::Joined(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 {
-            return;
-        }
-
-        let (msg_body, sender_username) =
-            if let Ok((msg_body, sender_username)) = should_process_message(self, &event).await {
-                (msg_body, sender_username)
-            } else {
-                return;
-            };
-
-        let results = self
-            .execute_commands(&room, &sender_username, &msg_body)
-            .await;
-
-        self.handle_results(&room, &sender_username, event.event_id.clone(), results)
-            .await;
-    }
-}

src/commands/basic_rolling.rs

@@ -1,28 +0,0 @@
-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"
-    }
-
-    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)
-    }
-}

src/commands/management.rs

@@ -1,82 +0,0 @@
-use super::{Command, Execution, ExecutionResult};
-use crate::context::Context;
-use crate::db::Users;
-use crate::error::BotError::{AccountDoesNotExist, AuthenticationError, PasswordCreationError};
-use crate::logic::hash_password;
-use crate::models::User;
-use async_trait::async_trait;
-
-pub struct RegisterCommand(pub String);
-
-#[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 {
-        let pw_hash = hash_password(&self.0).map_err(|e| PasswordCreationError(e))?;
-        let user = User {
-            username: ctx.username.to_owned(),
-            password: pw_hash,
-        };
-
-        ctx.db.upsert_user(&user).await?;
-        Execution::success(format!(
-            "User account registered/updated. Please log in to external applications \
-             with username {} and the password you set.",
-            ctx.username
-        ))
-    }
-}
-
-pub struct CheckCommand(pub String);
-
-#[async_trait]
-impl Command for CheckCommand {
-    fn name(&self) -> &'static str {
-        "check user password"
-    }
-
-    fn is_secure(&self) -> bool {
-        true
-    }
-
-    async fn execute(&self, ctx: &Context<'_>) -> ExecutionResult {
-        let user = ctx.db.authenticate_user(&ctx.username, &self.0).await?;
-
-        match user {
-            Some(_) => Execution::success("Password is correct!".to_string()),
-            None => Err(AuthenticationError.into()),
-        }
-    }
-}
-
-pub struct 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()),
-        }
-    }
-}

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

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

src/db/sqlite/users.rs

@@ -1,210 +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> {
-        sqlx::query(
-            r#"INSERT INTO accounts (user_id, password) VALUES (?, ?)
-               ON CONFLICT(user_id) DO UPDATE SET password = ?"#,
-        )
-        .bind(&user.username)
-        .bind(&user.password)
-        .bind(&user.password)
-        .execute(&self.conn)
-        .await?;
-
-        Ok(())
-    }
-
-    async fn delete_user(&self, username: &str) -> Result<(), DataError> {
-        sqlx::query(r#"DELETE FROM accounts WHERE user_id = ?"#)
-            .bind(&username)
-            .execute(&self.conn)
-            .await?;
-
-        Ok(())
-    }
-
-    async fn get_user(&self, username: &str) -> Result<Option<User>, DataError> {
-        let user_row = sqlx::query!(
-            r#"SELECT user_id, password FROM accounts
-               WHERE user_id = ?"#,
-            username
-        )
-        .fetch_optional(&self.conn)
-        .await?;
-
-        Ok(user_row.map(|u| User {
-            username: u.user_id,
-            password: u.password,
-        }))
-    }
-
-    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;
-
-    async fn create_db() -> Database {
-        let db_path = tempfile::NamedTempFile::new_in(".").unwrap();
-        crate::db::sqlite::migrator::migrate(db_path.path().to_str().unwrap())
-            .await
-            .unwrap();
-
-        Database::new(db_path.path().to_str().unwrap())
-            .await
-            .unwrap()
-    }
-
-    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
-    async fn create_and_get_user_test() {
-        let db = create_db().await;
-
-        let insert_result = db
-            .upsert_user(&User {
-                username: "myuser".to_string(),
-                password: "abc".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, "abc");
-    }
-
-    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
-    async fn can_update_user() {
-        let db = create_db().await;
-
-        let insert_result1 = db
-            .upsert_user(&User {
-                username: "myuser".to_string(),
-                password: "abc".to_string(),
-            })
-            .await;
-
-        assert!(insert_result1.is_ok());
-
-        let insert_result2 = db
-            .upsert_user(&User {
-                username: "myuser".to_string(),
-                password: "123".to_string(),
-            })
-            .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");
-        assert_eq!(user.password, "123"); //From second upsert
-    }
-
-    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
-    async fn can_delete_user() {
-        let db = create_db().await;
-
-        let insert_result = db
-            .upsert_user(&User {
-                username: "myuser".to_string(),
-                password: "abc".to_string(),
-            })
-            .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());
-    }
-
-    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
-    async fn username_not_in_db_returns_none() {
-        let db = create_db().await;
-        let user = db
-            .get_user("does not exist")
-            .await
-            .expect("Get user query failure");
-
-        assert!(user.is_none());
-    }
-
-    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
-    async fn authenticate_user_is_some_with_valid_password() {
-        let db = create_db().await;
-
-        let insert_result = db
-            .upsert_user(&User {
-                username: "myuser".to_string(),
-                password: crate::logic::hash_password("abc").expect("password hash error!"),
-            })
-            .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");
-    }
-
-    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
-    async fn authenticate_user_is_none_with_wrong_password() {
-        let db = create_db().await;
-
-        let insert_result = db
-            .upsert_user(&User {
-                username: "myuser".to_string(),
-                password: crate::logic::hash_password("abc").expect("password hash error!"),
-            })
-            .await;
-
-        assert!(insert_result.is_ok());
-
-        let user = db
-            .authenticate_user("myuser", "wrong-password")
-            .await
-            .expect("User retrieval query failed");
-
-        assert!(user.is_none());
-    }
-}

src/logic.rs

@@ -1,52 +0,0 @@
-use crate::context::Context;
-use crate::db::Variables;
-use crate::error::{BotError, DiceRollingError};
-use crate::parser::dice::{Amount, Element};
-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.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)
-}

src/models.rs

@@ -1,45 +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, Debug)]
-pub struct User {
-    pub username: String,
-    pub password: String,
-}
-
-impl User {
-    pub fn verify_password(&self, raw_password: &str) -> bool {
-        argon2::verify_encoded(&self.password, raw_password.as_bytes()).unwrap_or(false)
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn verify_password_passes_with_correct_password() {
-        let user = User {
-            username: "myuser".to_string(),
-            password: crate::logic::hash_password("mypassword").expect("Password hashing error!"),
-        };
-
-        assert_eq!(user.verify_password("mypassword"), true);
-    }
-
-    #[test]
-    fn verify_password_fails_with_wrong_password() {
-        let user = User {
-            username: "myuser".to_string(),
-            password: crate::logic::hash_password("mypassword").expect("Password hashing error!"),
-        };
-
-        assert_eq!(user.verify_password("wrong-password"), false);
-    }
-}