Module-Rust/README.md

# Module-Rust

The **[Rust](https://rust.facepunch.com/) module** for the Runic Gateway platform: everything that
makes a Runic Gateway site a site *for* Rust. It installs into a website core as
`modules/rust/` and is the platform's second game module, after
[`Module-uo`](https://gitea.whitlocktech.com/RunicGateway/Module-uo).

It is also the first module built from the
[Integration Kit](https://gitea.whitlocktech.com/RunicGateway/Integration-kit) rather than extracted
from the website — which makes it the kit's acceptance test from the inside.

**The repository name is not the module id.** This ships a module whose `id` is `rust`, because the
contract requires `id` to equal the directory core loads it from (`modules/rust/`), and that id is
the prefix of every table and every mount.

## What it is, in one diagram

```
Rust server + Oxide   (RunicGateway/Rust-Plugins)
   │  loopback TCP, the plugin dials out
   ▼
rust-link sidecar     (RunicGateway/Rust-Link)     one per game server
   │  HTTPS + WebSocket, bearer token
   ▼
this module, inside a website core                 one client per server
   │  same-origin JSON
   ▼
browser · Android app
```

**One server, one sidecar.** A community running six Rust servers runs six pairs and configures six
rows here; the website core never learns there is more than one.

## What ships today

| Surface | Route |
|---|---|
| Public | `GET /api/v1/public/rust/servers` — every server and what it last reported |
| Public | `GET …/servers/:id` — one server, or a `404`; the only route under `:id` that can say a server does not exist |
| Public | `GET …/servers/:id/events` — the feed, served from a default-deny allowlist (`server/catalogue.js`) |
| Public | `GET …/servers/:id/leaderboard` — per wipe, or all-time as those rows summed |
| Public | `GET …/servers/:id/wipes` and `…/online` |
| Player | `GET /api/v1/player/rust/servers` — the server list, on the authenticated tier |
| Admin | `GET/PUT/DELETE /api/v1/admin/rust/servers` and `POST …/:id/test` |
| Pages | `/rust` — the server list, and the module's landing page |
| Pages | `/rust/servers/:id` — one server: feed, leaderboard, who is on, wipes |
| Slot | `site.footer.status` — a live server/player count in core's footer |

Every page reads this module's own tables and never calls a game server, which is what lets the
whole surface render while every server in the fleet is off. Tab, feed filter, wipe and leaderboard
sort all live in the URL, so any view of it is a link.

Seven tables: `rust_servers` (configuration), `rust_server_state` and `rust_presence` (observed
state), `rust_wipes`, `rust_players`, `rust_player_wipe_stats` and `rust_gather_totals` (the record a
wipe does not erase), plus the bounded `rust_events` window and the `rust_ingest_cursor`.

The rest of the module — identity, site-owned permissions, Teams from Rust's clans, notifications,
events, the live map, Discord commands — arrives phase by phase. **Nothing is registered before it
has something behind it:** a declared trigger nothing emits and a declared slot nothing fills are
both surfaces an operator can configure and then wait on, which is worse than an absent one.

### What a client feature-detects on

`module.json` declares six capability strings, and `GET /api/v1/public/modules` hands them to any
client that asks — the website's own nav, and the Android app (`docs/modules/rust/PLAN.md` R10).
Five of them name a surface: `servers`, `killfeed`, `leaderboard`, `presence`, `wipes`.

The sixth is `rust`, and it names **the module itself**. It looks redundant beside `id`, and it is
not, for two reasons worth writing down before somebody tidies it away:

- **A client that asks "is this module installed" has nowhere else to ask.** Core flattens every
  started module's capabilities into one list, so `servers` alone is a word another module could
  declare tomorrow and silently reveal this one's screens. `rust` is the string that can only mean
  this module, and it is the single gate a whole navigation group hangs on — exactly the job `shard`
  does for `module-uo`.
- **`id` answers a different question.** It is a *mount prefix* (§2.1 requires it to equal the
  directory core loads the module from), and `MODULE_API.md` §2.9 is explicit that a client must
  never infer a route from a capability. Gating on `id` would quietly make the two the same thing,
  and the day a client builds `/<id>/servers` from it, the contract that lets this module move its
  own pages is gone.

An unknown capability is absent, and no route is ever derived from one.

## Build and check

```bash
npm ci --prefix server  && npm test --prefix server
npm run check:imports   --prefix server
npm run check:bundle    --prefix server
npm run check:swagger   --prefix server
npm ci --prefix client  && npm run build --prefix client
npm run check:externals --prefix client && npm test --prefix client
```

**Build the client BEFORE running its tests** — two of them read the built chunk and skip when there
is none, so a run in the other order passes while asking nothing about the artifact that ships.

Regenerate the OpenAPI fragment whenever a route or an annotation changes:

```bash
npm run swagger --prefix server   # writes swagger-fragment.json; commit it
```

`.gitea/workflows/pr-checks.yml` runs all of the above on every pull request, plus one job this
machine cannot run on its own: **frozen-manifest** clones core at the sha pinned in
[`ci/core-ref.json`](ci/core-ref.json), generates its route table without this module and then with
it, and takes the difference. That difference is the URL surface this module serves — checked
against the committed [`routes.manifest.json`](routes.manifest.json), against the OpenAPI fragment
in both directions, and against the rule that **a module may only add**. It is the only thing that
can see whether `/rust` collides with one of the routes core mounts at a tier root (`/status`,
`/version`), which the loader's own collision probe cannot find.

## How it reaches an operator

**An operator never builds anything.** A release is not source: it is the directory core's loader
expects at `modules/rust/`, already assembled — the prebuilt client chunk, the schema fragment and
the OpenAPI fragment, packed as they will be unpacked.

**Every merge to `main` carrying a releasable commit publishes a bundle.** The next version is
computed from conventional-commit subjects since the newest `v*` tag, as in `link`, `installer` and
`Module-uo`: `feat!:` or `BREAKING CHANGE` is a major, `feat:` a minor, `fix:` or `perf:` a patch,
and a `main` that gained none of those cuts no release. The number that ships is the **tag**, and CI
writes it into the `module.json` inside the bundle. `module.json`'s version survives as a **floor**:
name a version there above the newest tag and that version releases, which is how you overrule the
subjects. For a change with nothing releasable behind it — a widened `coreApi`, a new mount, a
capability — run the **Release** workflow by hand (Actions → Release → Run workflow).

Each release carries:

| Asset | What it is |
|---|---|
| `module-rust-<version>.tar.gz` | the directory core expects at `modules/rust/`, already assembled |
| `module-rust-<version>.json` | the install manifest: id, version, `coreApi`, the artifact's URL, size and **`sha256`** |
| `SHA256SUMS` | the same hash, in the shape every other repo here publishes |

Releases are **unsigned**; the `sha256` is the trust anchor, and the website verifies it before
unpacking. That is the model `installer`'s bundles already use, and a second trust model would be a
second thing to get right.

The tarball is assembled from an **include** list ([`ci/bundle.json`](ci/bundle.json)), never an
exclude list — an exclude list ships whatever it forgot. Tests, scripts, `client/src`, `ci/` and the
dev dependencies are not in it. It carries **no `node_modules`**, because the shipped half declares
no runtime dependencies: everything it needs arrives on `ctx`. `npm run check:bundle` holds both
halves of that — that the list still covers every file `server/index.js` can reach, and that no
runtime dependency has appeared without the release learning to pack it.

## Install it into a core

**From a release**, which is the supported path: in Admin → Modules, paste the URL of that release's
`module-rust-<version>.json`, and restart when the panel offers. Core fetches the manifest, checks
every URL and redirect hop against its own host allowlist, streams the artifact under a byte cap
while hashing it, verifies the `sha256`, inspects the archive in full before unpacking it to a
temporary directory, and only then moves it into `modules/rust/`. Nothing is written into the
modules directory until every check has passed. The allowlist must contain
`gitea.whitlocktech.com` — it is seeded from `MODULE_SOURCE_HOSTS` on a fresh install and is
DB-owned from then on, edited on that same screen. **An empty allowlist forbids every install rather
than permitting all of them.**

**From a working tree**, for development: copy the whole tree to `<website>/modules/rust/` and
restart. **Copy, do not symlink** — the loader lists directory entries and asks each whether it is a
directory; a symlink answers no and the module is skipped in complete silence.

Either way, the module appears when the process restarts: the volume is read at require time.

Then, in Admin → Rust, add a server: its name, the sidecar's base URL, and the token the sidecar
printed on first start (`rust-link-sidecar --print-config`). **The token is write-only** — it is
stored encrypted through core's own secret box and never returned to any client; the panel reports
only whether one is set.

`POST /api/v1/admin/rust/servers/:id/test` probes a sidecar and reports what came back in one word.
That is the route that tells a wrong URL from a wrong token from a mismatched protocol version —
all three present as "the site says my server is offline" and each has a different fix.

## The protocol is a contract

`PROTOCOL_VERSION` in `server/sidecarClient.js` is sent on every request as `X-RustLink-Version`,
and a sidecar speaking a different one answers `409` rather than serving something this module will
mis-parse. It must agree with the sidecar's own constant and with `overlay.toml` in the plugin repo.

Canonical spec:
[`docs/rust-link/PROTOCOL.md`](https://gitea.whitlocktech.com/RunicGateway/docs/src/branch/main/rust-link/PROTOCOL.md).
The module's own design of record is
[`docs/modules/rust/PLAN.md`](https://gitea.whitlocktech.com/RunicGateway/docs/src/branch/main/modules/rust/PLAN.md).

## Licence

GPL-3.0-or-later. See [LICENSE.md](LICENSE.md).