feat: add CD workflow

Reviewed-on: #17

.dockerignore

@@ -1,3 +1,32 @@
-/assets
-/.sqlx
-/.env.example
+# Include any files or directories that you don't want to be copied to your
+# container here (e.g., local build artifacts, temporary files, etc.).
+#
+# For more help, visit the .dockerignore file reference guide at
+# https://docs.docker.com/go/build-context-dockerignore/
+
+**/.DS_Store
+**/.classpath
+**/.dockerignore
+**/.env
+**/.git
+**/.gitignore
+**/.project
+**/.settings
+**/.toolstarget
+**/.vs
+**/.vscode
+**/*.*proj.user
+**/*.dbmdl
+**/*.jfm
+**/charts
+**/docker-compose*
+**/compose*
+**/Dockerfile*
+**/node_modules
+**/npm-debug.log
+**/secrets.dev.yaml
+**/values.dev.yaml
+/bin
+/target
+LICENSE
+README.md

.env.example

@@ -1,5 +1 @@
 DISCORD_TOKEN=changeme
-
-# Only useful when developing locally. Do not change it when deploying
-# with Docker.
-DATABASE_URL=sqlite:p4bl0t.db

.gitea/workflows/publish-docker.yaml

@@ -2,7 +2,7 @@ name: Create and publish a Docker image
 
 on:
   push:
-    branches: ['main', 'feature/docker']
+    branches: ['main', 'feature/cd']
 
 env:
   REGISTRY: labs.phundrak.com

.gitignore

@@ -1,4 +1,3 @@
 /target
 /.env
 *.db
-/.sqlx/

.sqlx/query-5b44991d1514160fa00572e398f0577ad44f839a0470f9eeb89da8b5e77f0e03.json

@@ -0,0 +1,12 @@
+{
+  "db_name": "SQLite",
+  "query": "\nINSERT INTO guild_log_channels (guild_id, channel_id)\nVALUES ( ?1, ?2 )",
+  "describe": {
+    "columns": [],
+    "parameters": {
+      "Right": 2
+    },
+    "nullable": []
+  },
+  "hash": "5b44991d1514160fa00572e398f0577ad44f839a0470f9eeb89da8b5e77f0e03"
+}

.sqlx/query-8444f7b7452a5ace6352aef943274f8a345a958257d896c7658b7700557959ab.json

@@ -0,0 +1,20 @@
+{
+  "db_name": "SQLite",
+  "query": "\nSELECT channel_id\nFROM guild_log_channels\nWHERE guild_id = ?1",
+  "describe": {
+    "columns": [
+      {
+        "name": "channel_id",
+        "ordinal": 0,
+        "type_info": "Int64"
+      }
+    ],
+    "parameters": {
+      "Right": 1
+    },
+    "nullable": [
+      false
+    ]
+  },
+  "hash": "8444f7b7452a5ace6352aef943274f8a345a958257d896c7658b7700557959ab"
+}

.sqlx/query-d6e9f422d6ae29a00658f55165018119d1e13d407266440415dfcc17a97ba00e.json

@@ -0,0 +1,12 @@
+{
+  "db_name": "SQLite",
+  "query": "\nDELETE FROM guild_log_channels\nWHERE guild_id = ?1 AND channel_id = ?2",
+  "describe": {
+    "columns": [],
+    "parameters": {
+      "Right": 2
+    },
+    "nullable": []
+  },
+  "hash": "d6e9f422d6ae29a00658f55165018119d1e13d407266440415dfcc17a97ba00e"
+}

Cargo.toml

@@ -10,12 +10,12 @@ homepage = "https://github.com/phundrak/p4bl0t"
 repository = "https://github.com/phundrak/p4bl0t"
 keywords = ["discord", "bot", "logging"]
 publish = false
+build = "build.rs"
 
 [dependencies]
 color-eyre = "0.6.2"
-dotenvy = "0.15.7"
 poise = { version = "0.5.7" }
-sqlx = { version = "0.7.2", features = ["sqlite", "tls-rustls", "runtime-tokio-rustls"] }
+sqlx = { version = "0.7.3", features = ["sqlite", "tls-rustls", "runtime-tokio-rustls"] }
 tokio = { version = "1.34.0", features = ["macros", "rt-multi-thread"] }
 tracing = "0.1.40"
 tracing-subscriber = "0.3.18"

Dockerfile

@@ -1,30 +1,74 @@
+# syntax=docker/dockerfile:1
+
+# Comments are provided throughout this file to help you get started.
+# If you need more help, visit the Dockerfile reference guide at
+# https://docs.docker.com/go/dockerfile-reference/
+
 ARG RUST_VERSION=1.73.0
-FROM rust:${RUST_VERSION}-slim-bullseye AS build
+ARG APP_NAME=p4bl0t
 
-RUN --mount=type=cache,target=/usr/local/cargo/registry \
-    cargo install sqlx-cli --no-default-features --features rustls,sqlite && \
-    cp /usr/local/cargo/bin/sqlx /bin/sqlx
-
-ENV DATABASE_URL=sqlite:/var/p4bl0t.db
+################################################################################
+# xx is a helper for cross-compilation.
+# See https://github.com/tonistiigi/xx/ for more information.
+FROM --platform=$BUILDPLATFORM tonistiigi/xx:1.3.0 AS xx
 
+################################################################################
+# Create a stage for building the application.
+FROM --platform=$BUILDPLATFORM rust:${RUST_VERSION}-alpine AS build
+ARG APP_NAME
 WORKDIR /app
+
+# Copy cross compilation utilities from the xx stage.
+COPY --from=xx / /
+
+# Install host build dependencies.
+RUN apk add --no-cache clang lld musl-dev git file
+
+# This is the architecture you’re building for, which is passed in by the builder.
+# Placing it here allows the previous steps to be cached across architectures.
+ARG TARGETPLATFORM
+
+# Install cross compilation build dependencies.
+RUN xx-apk add --no-cache musl-dev gcc
+
+# Build the application.
+# Leverage a cache mount to /usr/local/cargo/registry/
+# for downloaded dependencies, a cache mount to /usr/local/cargo/git/db
+# for git repository dependencies, and a cache mount to /app/target/ for
+# compiled dependencies which will speed up subsequent builds.
+# Leverage a bind mount to the src directory to avoid having to copy the
+# source code into the container. Once built, copy the executable to an
+# output directory before the cache mounted /app/target is unmounted.
 RUN --mount=type=bind,source=src,target=src \
     --mount=type=bind,source=Cargo.toml,target=Cargo.toml \
     --mount=type=bind,source=Cargo.lock,target=Cargo.lock \
+    --mount=type=bind,source=build.rs,target=build.rs \
+    --mount=type=bind,source=.sqlx,target=.sqlx \
     --mount=type=bind,source=migrations,target=migrations \
-    --mount=type=cache,target=/app/target/ \
-    --mount=type=cache,target=/usr/local/cargo/registry \
+    --mount=type=cache,target=/app/target/,id=rust-cache-${APP_NAME}-${TARGETPLATFORM} \
+    --mount=type=cache,target=/usr/local/cargo/git/db \
+    --mount=type=cache,target=/usr/local/cargo/registry/ \
     <<EOF
 set -e
-sqlx database create
-sqlx migrate run
-cargo install --locked --path .
+xx-cargo build --locked --release --target-dir ./target
+cp ./target/$(xx-cargo --print-target-triple)/debug/$APP_NAME /bin/server
+xx-verify /bin/server
 EOF
 
+################################################################################
+# Create a new stage for running the application that contains the minimal
+# runtime dependencies for the application. This often uses a different base
+# image from the build stage where the necessary files are copied from the build
+# stage.
+#
+# The example below uses the alpine image as the foundation for running the app.
+# By specifying the "3.18" tag, it will use version 3.18 of alpine. If
+# reproducability is important, consider using a digest
+# (e.g., alpine@sha256:664888ac9cfd28068e062c991ebcff4b4c7307dc8dd4df9e728bedde5c449d91).
+FROM alpine:3.19 AS final
 
-FROM debian:bullseye-slim AS final
-
-RUN apt-get update && apt-get install -qqy ca-certificates
+# Create a non-privileged user that the app will run under.
+# See https://docs.docker.com/go/dockerfile-user-best-practices/
 ARG UID=10001
 RUN adduser \
     --disabled-password \
@@ -34,12 +78,15 @@ RUN adduser \
     --no-create-home \
     --uid "${UID}" \
     appuser
+WORKDIR /app
+RUN chown -R appuser /app
 USER appuser
 
-ENV DATABASE_URL=sqlite:/var/p4bl0t.db
-ENV DISCORD_TOKEN=changeme
+# Copy the executable from the "build" stage.
+COPY --from=build /bin/server /bin/
 
-COPY --from=build /usr/local/cargo/bin/p4bl0t /bin
-COPY --chown=appuser --from=build /var/p4bl0t.db /var/p4bl0t.db
+# Expose the port that the application listens on.
+# EXPOSE 8080
 
-CMD [ "p4bl0t" ]
+# What the container should run when it is started.
+CMD ["/bin/server"]

README.md

@@ -3,11 +3,24 @@
 p4bl0t is a simple logging bot for Discord written in Rust.
 
 ## Usage
-
-In order to run p4bl0t, head over to your [developer
+### Preparation
+In order to run p4bl0t, you will need a Discord token with which your
+bot will authenticate. Head over to your [developer
 portal](https://discord.com/developers) on Discord’s website, and
-create a bot there. Then, copy the `.env.example` file to a `.env`
-file and fill in the details.
+create a bot there. You will be able to get the bot’s token there.
+
+### Docker
+The easiest way to run p4bl0t is using Docker. Copy
+`docker-compose.example.yml` to `docker-compose.yml` and modify the
+`DISCORD_TOKEN` variable.
+
+Then, you can simply run
+```sh
+docker compose up # or docker-compose on some machines
+```
+
+### Building and running it yourself
+Copy the `.env.example` file to a `.env` file and fill in the details.
 ```sh
 cp .env.example .env
 emacs .env
@@ -27,7 +40,6 @@ cargo install sqlx-cli
 
 Setup your SQLite database.
 ```sh
-export DATABASE_URL=<your-database-url> # should be the same as in the .env file
 sqlx database create
 sqlx migrate run
 ```

build.rs

@@ -0,0 +1,5 @@
+// generated by `sqlx migrate build-script`
+fn main() {
+    // trigger recompilation when a new migration is added
+    println!("cargo:rerun-if-changed=migrations");
+}

docker-compose.example.yml

@@ -0,0 +1,9 @@
+services:
+  p4bl0t:
+    build:
+      context: .
+      target: final
+    environment:
+      DISCORD_TOKEN: changeme
+    volumes:
+      - ./p4bl0t.db:/app/p4bl0t.db

docker-compose.yml

@@ -1,8 +0,0 @@
-version: '3'
-
-services:
-  p4bl0t:
-    env_file: .env
-    build:
-      context: .
-      target: final

src/db/mod.rs

@@ -1,10 +1,8 @@
 #![allow(clippy::cast_possible_wrap, clippy::cast_sign_loss)]
 
-use std::env;
-
 use poise::serenity_prelude::{ChannelId, GuildId};
-use sqlx::SqlitePool;
-use tracing::{error, info};
+use sqlx::{migrate::MigrateDatabase, Sqlite, SqlitePool};
+use tracing::{error, info, debug};
 
 pub type Result<T> = ::std::result::Result<T, sqlx::Error>;
 
@@ -16,20 +14,23 @@ impl Database {
     /// The Sqlite database should already exist and have its
     /// migrations already executed.
     ///
-    /// # Panics
-    ///
-    /// Panics if the environment variable `DATABASE_URL` is not set.
-    ///
     /// # Errors
     ///
     /// This function will return an error if the Sqlite pool fails to
     /// create.
-    // TODO: Create the database if it doesn’t exist already and run migrations
     pub async fn new() -> Result<Self> {
-        let db_url = env::var("DATABASE_URL")
-            .expect("Missing enviroment variable DATABASE_URL");
-        info!("Connecting to database located at {db_url}");
-        Ok(Self(SqlitePool::connect(&db_url).await?))
+        let url = "sqlite:p4bl0t.db";
+        if !Sqlite::database_exists(url).await? {
+            info!("Creating database");
+            Sqlite::create_database(url).await?;
+            info!("Database created");
+        }
+        debug!("Getting pool connection");
+        let pool = SqlitePool::connect(url).await?;
+        info!("Running migrations");
+        sqlx::migrate!().run(&pool).await?;
+        debug!("Database initialized");
+        Ok(Self(pool))
     }
 
     /// Return from database all channels registered as loggers for a

src/discord/mod.rs

@@ -1,10 +1,9 @@
 mod commands;
-pub mod error;
 mod events;
 pub mod utils;
+pub mod error;
 
 use poise::FrameworkBuilder;
-use tracing::info;
 use utils::serenity;
 
 use commands::logging;
@@ -20,9 +19,6 @@ pub type Result = ::std::result::Result<(), Error>;
 ///
 /// Panics if the environment `DISCORD_TOKEN` is unavailable.
 pub fn make_bot() -> FrameworkBuilder<BotData, Error> {
-    match std::env::var("DISCORD_TOKEN") {
-        Ok(token) => {
-            info!("Launching bot with token {token}");
     poise::Framework::builder()
         .options(poise::FrameworkOptions {
             commands: vec![logging()],
@@ -31,7 +27,7 @@ pub fn make_bot() -> FrameworkBuilder<BotData, Error> {
             },
             ..Default::default()
         })
-                .token(token)
+        .token(std::env::var("DISCORD_TOKEN").expect("missing DISCORD_TOKEN"))
         .intents(serenity::GatewayIntents::non_privileged())
         .setup(|ctx, _ready, framework| {
             Box::pin(async move {
@@ -43,7 +39,4 @@ pub fn make_bot() -> FrameworkBuilder<BotData, Error> {
                 Ok(BotData::new().await?)
             })
         })
-        }
-        Err(_) => panic!("DISCORD_TOKEN environment variable is missing."),
-    }
 }

src/main.rs

@@ -6,18 +6,11 @@ mod utils;
 
 use std::error::Error;
 
-use tracing::info;
-
 #[tokio::main]
 async fn main() -> Result<(), Box<dyn Error>> {
-    println!("Setting logging up");
     utils::setup_logging();
-    info!("Setting up color_eyre");
     color_eyre::install()?;
-    info!("Reading from dotenv");
-    let _ =
-        dotenvy::dotenv().map_err(|_| info!("No .env file found, skipping"));
-    info!("Launching bot");
+
     let bot = discord::make_bot();
     bot.run().await?;