109 lines
4 KiB
Markdown
109 lines
4 KiB
Markdown
# rustbot
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A small, modular IRC bot in Rust — **zero dependencies**, with its own IRC
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protocol layer built to the [modern IRC client spec](https://modern.ircdocs.horse/).
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## Structure
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| File | Layer | Responsibility |
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|---------------|------------------|-----------------------------------------------------------|
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| `src/irc.rs` | protocol + I/O | Parse/serialize IRC messages (incl. IRCv3 tags), TCP transport |
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| `src/bot.rs` | behavior | Registration, event loop, command handling |
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| `src/main.rs` | wiring | Config from env vars, connect/reconnect supervisor |
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The layers are deliberately separable: `irc.rs` knows nothing about the bot, and
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`bot.rs` knows nothing about how the process is launched.
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## Build & run
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```sh
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cargo build # or: cargo build --release
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cargo test # unit tests for the message parser
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cargo run
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```
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## Configuration
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Settings are layered, each overriding the previous:
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1. **Built-in defaults** (`Config::default()` in `src/bot.rs`)
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2. **A config file** — `key = value`, see [`rustbot.conf`](rustbot.conf)
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3. **Environment variables** — handy for one-off overrides
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The config file is found via: the **first CLI argument**, else `RUSTBOT_CONFIG`,
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else `./rustbot.conf` if present.
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```sh
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cargo run # uses ./rustbot.conf
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cargo run -- /etc/rustbot.conf # explicit path
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RUSTBOT_CONFIG=/etc/rustbot.conf cargo run
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```
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Config file keys: `server`, `port`, `nick`, `user`, `realname`,
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`channels` (comma/space-separated), `prefix`, `password`.
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Whole-line `#`/`;` comments only — inline comments would clash with channel `#`s.
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Environment overrides: `IRC_SERVER`, `IRC_PORT`, `IRC_NICK`, `IRC_REALNAME`,
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`IRC_CHANNELS`, `IRC_PREFIX`, `IRC_PASSWORD`.
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```sh
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IRC_NICK=mybot IRC_CHANNELS='#test' cargo run # override the file for one run
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```
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> If you put a real `password` in `rustbot.conf`, add it to `.gitignore` so the
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> secret isn't committed.
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## Built-in commands
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With the default `!` prefix:
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- `!ping` → `pong`
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- `!echo <text>` → echoes text back
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- `!hello` → greets the sender
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- `!help` → lists commands
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Add your own in `Bot::handle_command` in `src/bot.rs`.
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## Deployment (systemd)
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Runs as a system service (`User=debian`), auto-restarts on crash, and starts on
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boot. The unit is kept in the repo as [`rustbot.service`](rustbot.service).
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```sh
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cargo build --release
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sudo cp rustbot.service /etc/systemd/system/rustbot.service
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sudo systemctl daemon-reload
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sudo systemctl enable --now rustbot # start now + on boot
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systemctl status rustbot # health
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journalctl -u rustbot -f # live logs (<< in, >> out)
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sudo systemctl restart rustbot # after a rebuild
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```
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One-off overrides without touching `rustbot.conf`: put `IRC_*` lines in
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`/etc/default/rustbot` (env wins over the config file), then restart.
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## IRCv3
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The bot negotiates capabilities (`CAP LS 302` → `CAP REQ` → `CAP END`) and
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enables everything useful the server offers: `message-tags`, `server-time`,
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`batch`, `echo-message`, `account-tag`, `extended-join`, `multi-prefix`,
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`away-notify`, `chghost`, `setname`, `userhost-in-names`, `cap-notify`,
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`labeled-response`.
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Two of these do real work:
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- **`server-time` + `batch`** let the bot recognise **replayed history**. On
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join, InspIRCd replays recent channel lines (wrapped in a `chathistory`
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batch). Without this the bot re-answered old commands on every reconnect;
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now such messages are ignored (see `Bot::is_historical`).
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- **`sasl`** (PLAIN) authenticates to services during negotiation. Set
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`sasl_user`/`sasl_pass` in the config (or `IRC_SASL_USER`/`IRC_SASL_PASS`).
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base64 is hand-rolled, so this stays dependency-free.
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## Roadmap / natural next steps
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- **TLS** (port 6697, or the `tls` STARTTLS cap) — the one remaining item that
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needs a dependency (`rustls`/`native-tls`).
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- **Read timeout + client-sent PING** to detect dead connections faster.
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- Split commands into a registry/trait once there are many of them.
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