Merge pull request 'ci(link): gate pull requests into main on fmt, clippy, and test' (#23) from ci/pr-checks into main

Reviewed-on: #23

.gitea/workflows/pr-checks.yml

@@ -0,0 +1,101 @@
+# Gate every pull request into `main` on the same Rust checks the release runs,
+# so a formatting slip, a lint regression, or a failing test can't reach the
+# deployable branch.
+#
+# Why this exists: release.yml runs only AFTER merge (on push to `main`) and its
+# FIRST Rust step is `cargo fmt --check`. Before this workflow, an unformatted
+# commit merged cleanly and then killed the release job before it could build,
+# tag, or publish anything — the repo had no pull_request workflow at all. These
+# gates are deliberately a mirror of release.yml's, in the same order, so a green
+# PR means the release will get past its gates too.
+#
+# Enforcement (one-time, in the Gitea UI):
+#   Repository Settings → Branches → Branch Protection (rule for `main`)
+#     • Enable Status Check
+#     • Status check patterns:  PR Checks / *
+#   Note: Gitea only lists a context in its dropdown after it has reported once,
+#   so let this workflow run on one PR first. The `PR Checks / *` glob matches
+#   without needing the dropdown.
+#
+# Scope note: this gates PRs into `main` only. Feature work that lands on an
+# integration branch first (e.g. `edge`) is still caught on the branch's PR into
+# `main`. To gate that earlier hop too, add the branch to the `branches:` list
+# below — nothing else needs to change.
+#
+# Runner: the same self-hosted `ubuntu-latest` runner release.yml uses. Rust is
+# not assumed to be preinstalled, so the toolchain step bootstraps it the same
+# way release.yml does (minus the MinGW cross-compile deps — PRs build for the
+# host only; the Windows cross-build stays a release-time concern).
+
+name: PR Checks
+
+on:
+  pull_request:
+    branches: [main]
+
+# A newer push to the same PR cancels the in-flight run.
+concurrency:
+  group: pr-checks-${{ github.ref }}
+  cancel-in-progress: true
+
+env:
+  WORKDIR: sidecar
+
+jobs:
+  rust-gates:
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    steps:
+      - uses: actions/checkout@v4
+
+      # One job runs all three gates on purpose: installing the toolchain costs
+      # far more than the checks themselves, so splitting fmt/clippy/test into
+      # parallel jobs would pay that cost three times for no wall-clock win.
+      - name: Install Rust toolchain (rustfmt + clippy)
+        run: |
+          set -euo pipefail
+          SUDO=""; [ "$(id -u)" -ne 0 ] && SUDO="sudo"
+          $SUDO apt-get update
+          $SUDO apt-get install -y --no-install-recommends \
+            build-essential curl ca-certificates git
+
+          if ! command -v cargo >/dev/null 2>&1; then
+            curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs \
+              | sh -s -- -y --profile minimal --default-toolchain stable
+          fi
+          echo "${HOME}/.cargo/bin" >> "$GITHUB_PATH"
+          export PATH="${HOME}/.cargo/bin:${PATH}"
+          rustup component add rustfmt clippy
+          cargo --version && cargo fmt --version && cargo clippy --version
+
+      # Keyed on Cargo.lock: dependency builds are reused until a dep actually
+      # changes. A cache miss only makes the run slower, never wrong.
+      - name: Cache cargo registry and build dir
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cargo/registry
+            ~/.cargo/git
+            sidecar/target
+          key: ${{ runner.os }}-cargo-${{ hashFiles('sidecar/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-
+
+      # Cheapest gate first — parses only, no compile, so a formatting slip
+      # fails in seconds instead of after a full build.
+      - name: cargo fmt --check
+        working-directory: sidecar
+        run: cargo fmt --check
+
+      # --all-targets covers tests and examples, not just the binary.
+      # -D warnings makes a lint a failure; the crate is clean at this bar today,
+      # so anything new here is a regression introduced by the PR.
+      - name: cargo clippy
+        working-directory: sidecar
+        run: cargo clippy --locked --all-targets -- -D warnings
+
+      # --locked matches release.yml: it also proves Cargo.lock is in sync with
+      # Cargo.toml, rather than letting the build silently update it.
+      - name: cargo test
+        working-directory: sidecar
+        run: cargo test --locked

README.md

@@ -25,6 +25,7 @@ network-facing component, which is what keeps the game unreachable from the inte
 | Path | What |
 |------|------|
 | `sidecar/` | The Rust sidecar crate — terminates the loopback link to the shard, exposes WS + REST to the website. See [`sidecar/README.md`](sidecar/README.md). |
+| `.gitea/workflows/pr-checks.yml` | Gates every PR into `main` on `cargo fmt --check`, `cargo clippy -D warnings`, and `cargo test`. |
 | `.gitea/workflows/release.yml` | Builds + releases the sidecar binary (Linux + Windows) on every merge to `main`. |
 
 ## Build & run
@@ -42,6 +43,17 @@ cargo run --release
 every merge to `main` (conventional-commit versioning). See [`sidecar/README.md`](sidecar/README.md)
 for configuration and the wire protocol.
 
+Before that, `.gitea/workflows/pr-checks.yml` runs the same gates on every pull request into `main` —
+`cargo fmt --check`, `cargo clippy --all-targets -- -D warnings`, then `cargo test --locked`. Run them
+locally before pushing and the PR will be green:
+
+```bash
+cd sidecar
+cargo fmt                                        # or --check to just report
+cargo clippy --locked --all-targets -- -D warnings
+cargo test --locked
+```
+
 ## Deployment & compatibility
 
 The plugin ([RunicGateway/servuo-plugins](https://gitea.whitlocktech.com/RunicGateway/servuo-plugins))

sidecar/README.md

@@ -41,10 +41,10 @@ So you can never accidentally run without auth. Rotate by editing the token and
 
 ## Protocol version
 
-The wire protocol has a version (`PROTOCOL_VERSION`, currently **1**), so the website and sidecar detect a mismatch immediately instead of failing in strange ways when a message shape changes.
+The wire protocol has a version (`PROTOCOL_VERSION`, currently **3**), so the website and sidecar detect a mismatch immediately instead of failing in strange ways when a message shape changes.
 
-- Every response carries an `X-UOLink-Version: 1` header.
+- Every response carries an `X-UOLink-Version: 3` header.
-- `/health` and the WebSocket `ws.hello` include `"protocol": 1`.
+- `/health` and the WebSocket `ws.hello` include `"protocol": 3`.
 - If a request sends `X-UOLink-Version` and it disagrees with the sidecar, the request is rejected **409 Conflict** with `{sidecar_protocol, client_protocol}` so the mismatch is obvious.
 
 Bump `PROTOCOL_VERSION` in `main.rs` whenever an event or endpoint's shape changes.

sidecar/src/main.rs

@@ -24,7 +24,12 @@ use tracing_subscriber::EnvFilter;
 /// v2 (Protocol 2.0): adds the account-provisioning verbs/endpoints (`POST /accounts/create`,
 /// `DELETE /link/:account`) and their events. Outbound event kinds are additive, so a v1 website
 /// keeps working against the live feed; the new *endpoints* require a v2 sidecar.
-pub const PROTOCOL_VERSION: u32 = 2;
+///
+/// v3 (Protocol 3.0): adds `world.ruleset`, `points.board` and `vendor.listing` /
+/// `vendor.listing.remove`, with the `GET /ruleset`, `/points` and `/market` reads that serve them
+/// from the store. Same shape as the v2 bump — the kinds are additive, the endpoints are not — and
+/// there is deliberately no feature-negotiation array: v3 implies all three kinds.
+pub const PROTOCOL_VERSION: u32 = 3;
 
 #[tokio::main]
 async fn main() -> anyhow::Result<()> {
@@ -194,6 +199,75 @@ async fn main() -> anyhow::Result<()> {
                             }
                         }
                     }
+                    // Points/loyalty boards (Protocol 3.0): one row per point system, keyed by
+                    // the shard's own PointsType name. The plugin only emits a system whose top N
+                    // actually moved, so this is a sparse stream of overwrites — and there is no
+                    // `points.remove` to handle, because the shard's set of systems is fixed at
+                    // startup and cannot shrink.
+                    "points.board" => {
+                        if let Some(system) = ev.value.get("system").and_then(|s| s.as_str()) {
+                            if let Err(e) = event_store
+                                .upsert_points_board(
+                                    system,
+                                    ev.value.get("nameString").and_then(|n| n.as_str()),
+                                    &text,
+                                    t,
+                                )
+                                .await
+                            {
+                                tracing::warn!(error = %e, "failed to upsert points board");
+                            }
+                        }
+                    }
+                    // Player-vendor market index (Protocol 3.0). Each frame is authoritative for
+                    // one vendor — the shard's round-robin sweep only emits a shop whose contents,
+                    // prices or location actually moved — so this is a whole-row overwrite.
+                    //
+                    // Unlike the boards above there IS a remove: a vendor is dismissed, expires, or
+                    // its owner switches off the in-game Vendor Search flag, and any of those must
+                    // take the shop off the site. The last of the three is a privacy control, so
+                    // dropping the row promptly is the point rather than housekeeping.
+                    "vendor.listing" => {
+                        if let Some(serial) = ev.value.get("serial").and_then(|s| s.as_str()) {
+                            let loc = ev.value.get("location");
+                            let field = |k: &str| loc.and_then(|l| l.get(k));
+                            if let Err(e) = event_store
+                                .upsert_vendor(
+                                    serial,
+                                    ev.value.get("shopName").and_then(|v| v.as_str()),
+                                    ev.value.get("ownerName").and_then(|v| v.as_str()),
+                                    field("map").and_then(|v| v.as_str()),
+                                    field("x").and_then(|v| v.as_i64()),
+                                    field("y").and_then(|v| v.as_i64()),
+                                    field("region").and_then(|v| v.as_str()),
+                                    ev.value.get("count").and_then(|v| v.as_i64()),
+                                    &text,
+                                    t,
+                                )
+                                .await
+                            {
+                                tracing::warn!(error = %e, "failed to upsert vendor listing");
+                            }
+                        }
+                    }
+                    "vendor.listing.remove" => {
+                        if let Some(serial) = ev.value.get("serial").and_then(|s| s.as_str()) {
+                            if let Err(e) = event_store.delete_vendor(serial).await {
+                                tracing::warn!(error = %e, "failed to remove vendor listing");
+                            }
+                        }
+                    }
+                    // Shard ruleset (Protocol 3.0): a singleton projection. The shard re-emits
+                    // world.ruleset on every connect, so this row is simply overwritten; `rev`
+                    // lets a reader tell a re-send from an actual config change.
+                    "world.ruleset" => {
+                        if let Err(e) = event_store
+                            .upsert_ruleset(ev.value.get("rev").and_then(|r| r.as_str()), &text, t)
+                            .await
+                        {
+                            tracing::warn!(error = %e, "failed to upsert ruleset");
+                        }
+                    }
                     _ => {}
                 }
             }

sidecar/src/store.rs

@@ -293,6 +293,174 @@ impl Store {
         Ok(parse_json_column(rows))
     }
 
+    // ---- shard ruleset (Protocol 3.0) ----
+
+    /// Stores the shard's published ruleset. A singleton (`id = 1`): the shard emits one
+    /// `world.ruleset` frame per connect describing how it is configured, and only the latest one
+    /// matters. `rev` is the shard's FNV-1a of the body, kept so a reader can tell "same ruleset,
+    /// re-sent on reconnect" from "the operator changed something" without diffing the JSON.
+    pub async fn upsert_ruleset(
+        &self,
+        rev: Option<&str>,
+        json: &str,
+        t: i64,
+    ) -> anyhow::Result<()> {
+        sqlx::query(
+            "INSERT INTO ruleset (id, rev, json, updated_t) VALUES (1, ?, ?, ?)
+             ON CONFLICT(id) DO UPDATE SET rev = excluded.rev, json = excluded.json, updated_t = excluded.updated_t",
+        )
+        .bind(rev)
+        .bind(json)
+        .bind(t)
+        .execute(&self.pool)
+        .await?;
+        Ok(())
+    }
+
+    /// The stored ruleset, or `None` if the shard has never published one. Returning `None` rather
+    /// than an empty object is deliberate: "not published yet" and "published, everything off" are
+    /// different answers and the website renders them differently.
+    pub async fn ruleset(&self) -> anyhow::Result<Option<Value>> {
+        let row = sqlx::query("SELECT json FROM ruleset WHERE id = 1")
+            .fetch_optional(&self.pool)
+            .await?;
+        Ok(row.and_then(|r| serde_json::from_str(&r.get::<String, _>("json")).ok()))
+    }
+
+    // ---- points / loyalty boards (Protocol 3.0) ----
+
+    /// Upserts one system's leaderboard, keyed by its `PointsType` name (`QueensLoyalty`,
+    /// `CleanUpBritannia`, …). Fed from `points.board`; one row per system, always the most recent
+    /// top-N snapshot.
+    ///
+    /// There is no matching delete, and that is deliberate rather than an omission: the shard's set
+    /// of point systems is fixed at startup by `PointsSystem.Configure`, so a system cannot vanish
+    /// at runtime and the plugin emits no `points.remove`. Same argument the governor board makes.
+    pub async fn upsert_points_board(
+        &self,
+        system: &str,
+        name: Option<&str>,
+        json: &str,
+        t: i64,
+    ) -> anyhow::Result<()> {
+        sqlx::query(
+            "INSERT INTO points_boards (system, name, json, updated_t) VALUES (?, ?, ?, ?)
+             ON CONFLICT(system) DO UPDATE SET name = excluded.name, json = excluded.json, updated_t = excluded.updated_t",
+        )
+        .bind(system)
+        .bind(name)
+        .bind(json)
+        .bind(t)
+        .execute(&self.pool)
+        .await?;
+        Ok(())
+    }
+
+    /// Every system's latest board, ordered by display name then system key. Systems the shard has
+    /// never published are simply absent — the website renders the set it is given.
+    pub async fn points_boards_all(&self) -> anyhow::Result<Vec<Value>> {
+        let rows = sqlx::query("SELECT json FROM points_boards ORDER BY name, system")
+            .fetch_all(&self.pool)
+            .await?;
+        Ok(parse_json_column(rows))
+    }
+
+    /// One system's board, or `None` when that system has never published one. `None` is a real
+    /// answer (an unknown system name, or one the operator excluded via `Bridge.cfg PointsSystems`),
+    /// which the website turns into a 404 rather than an empty board.
+    pub async fn points_board(&self, system: &str) -> anyhow::Result<Option<Value>> {
+        let row = sqlx::query("SELECT json FROM points_boards WHERE system = ?")
+            .bind(system)
+            .fetch_optional(&self.pool)
+            .await?;
+        Ok(row.and_then(|r| serde_json::from_str(&r.get::<String, _>("json")).ok()))
+    }
+
+    // ---- player-vendor market index (Protocol 3.0) ----
+
+    /// Upserts one vendor's whole listing, keyed by serial. Fed from `vendor.listing`, which the
+    /// shard emits as an authoritative per-vendor frame — so this replaces the row outright rather
+    /// than merging anything.
+    ///
+    /// The items ride inside `json` and are deliberately NOT normalized into a `vendor_items`
+    /// table. The sidecar's job for the market is outage resilience (`PROTOCOL_2.md` §12.2) — hand
+    /// the website back what the shard last said — not search. Search lives in MariaDB on the
+    /// website side, where the query surface, the indexes and the cliloc-resolved display names
+    /// already are; a second search implementation here would be one more thing to keep in step
+    /// with it for no reader.
+    #[allow(clippy::too_many_arguments)]
+    pub async fn upsert_vendor(
+        &self,
+        serial: &str,
+        shop_name: Option<&str>,
+        owner_name: Option<&str>,
+        map: Option<&str>,
+        x: Option<i64>,
+        y: Option<i64>,
+        region: Option<&str>,
+        count: Option<i64>,
+        json: &str,
+        t: i64,
+    ) -> anyhow::Result<()> {
+        sqlx::query(
+            "INSERT INTO vendors (serial, shop_name, owner_name, map, x, y, region, count, json, updated_t)
+             VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
+             ON CONFLICT(serial) DO UPDATE SET shop_name = excluded.shop_name,
+               owner_name = excluded.owner_name, map = excluded.map, x = excluded.x, y = excluded.y,
+               region = excluded.region, count = excluded.count, json = excluded.json,
+               updated_t = excluded.updated_t",
+        )
+        .bind(serial)
+        .bind(shop_name)
+        .bind(owner_name)
+        .bind(map)
+        .bind(x)
+        .bind(y)
+        .bind(region)
+        .bind(count)
+        .bind(json)
+        .bind(t)
+        .execute(&self.pool)
+        .await?;
+        Ok(())
+    }
+
+    /// Drops one vendor from the index. Fed from `vendor.listing.remove` — a vendor dismissed,
+    /// expired, or whose owner switched off its in-game Vendor Search flag.
+    pub async fn delete_vendor(&self, serial: &str) -> anyhow::Result<()> {
+        sqlx::query("DELETE FROM vendors WHERE serial = ?")
+            .bind(serial)
+            .execute(&self.pool)
+            .await?;
+        Ok(())
+    }
+
+    /// One page of the index, ordered by serial.
+    ///
+    /// Paged where the other boards are not, and the ordering is why it can be: a whole-world
+    /// market is the one board that does not fit in a response. Ordering by SERIAL rather than by
+    /// shop name is deliberate — the page is a snapshot cursor for the website's reconnect
+    /// backfill, and a serial is stable while a shop name is renameable, so a rename mid-backfill
+    /// cannot make a vendor skip or repeat a page.
+    pub async fn vendors_page(&self, limit: i64, offset: i64) -> anyhow::Result<Vec<Value>> {
+        let limit = limit.clamp(1, 1000);
+        let offset = offset.max(0);
+        let rows = sqlx::query("SELECT json FROM vendors ORDER BY serial LIMIT ? OFFSET ?")
+            .bind(limit)
+            .bind(offset)
+            .fetch_all(&self.pool)
+            .await?;
+        Ok(parse_json_column(rows))
+    }
+
+    /// How many vendors the index holds, so a paging caller knows when to stop.
+    pub async fn vendors_count(&self) -> anyhow::Result<i64> {
+        let row = sqlx::query("SELECT COUNT(*) AS n FROM vendors")
+            .fetch_one(&self.pool)
+            .await?;
+        Ok(row.get::<i64, _>("n"))
+    }
+
     // ---- Town Cryer news (Protocol 2.1) ----
 
     /// Stores/replaces one external news article (the `news.add` command json), keyed by id. The
@@ -392,4 +560,39 @@ CREATE TABLE IF NOT EXISTS news (
     json      TEXT NOT NULL,
     updated_t INTEGER NOT NULL
 );
+
+-- Points/loyalty leaderboards (Protocol 3.0). One row per point system, keyed by the shard's
+-- own PointsType name; `name` is the resolved display name, hoisted only for the ORDER BY.
+CREATE TABLE IF NOT EXISTS points_boards (
+    system    TEXT PRIMARY KEY,
+    name      TEXT,
+    json      TEXT NOT NULL,
+    updated_t INTEGER NOT NULL
+);
+
+-- Player-vendor market index (Protocol 3.0). One row per vendor, holding the whole authoritative
+-- `vendor.listing` frame including its items. The hoisted columns exist for the ORDER BY and for
+-- an operator eyeballing the table; nothing here is searched, because search is the website's job
+-- (see upsert_vendor). Rows are dropped on `vendor.listing.remove`.
+CREATE TABLE IF NOT EXISTS vendors (
+    serial     TEXT PRIMARY KEY,
+    shop_name  TEXT,
+    owner_name TEXT,
+    map        TEXT,
+    x          INTEGER,
+    y          INTEGER,
+    region     TEXT,
+    count      INTEGER,
+    json       TEXT NOT NULL,
+    updated_t  INTEGER NOT NULL
+);
+
+-- The shard's published ruleset (Protocol 3.0). Singleton: the CHECK is what makes it one,
+-- so an upsert can target id = 1 unconditionally and no second row can ever appear.
+CREATE TABLE IF NOT EXISTS ruleset (
+    id        INTEGER PRIMARY KEY CHECK (id = 1),
+    rev       TEXT,
+    json      TEXT NOT NULL,
+    updated_t INTEGER NOT NULL
+);
 "#;

sidecar/src/web.rs

@@ -82,6 +82,20 @@ pub async fn serve(addr: &str, state: AppState) -> anyhow::Result<()> {
         .route("/governors", get(governors))
         .route("/online", get(online))
         .route("/houses", get(houses))
+        // The shard ruleset (Protocol 3.0), likewise store-backed: the shard publishes it once per
+        // connect, so serving it from the store is what lets the site's rules page render while the
+        // shard is down.
+        .route("/ruleset", get(ruleset))
+        // Points/loyalty leaderboards (Protocol 3.0), store-backed like the other boards: the
+        // whole set, or one system by its PointsType name.
+        .route("/points", get(points))
+        .route("/points/:system", get(points_system))
+        // The player-vendor market index (Protocol 3.0). `/market`, NOT `/vendors`: axum would
+        // route the latter fine, but `/vendors/:account` next door is the per-account RPC, and two
+        // routes a prefix apart that mean "this player's shops" and "every shop on the shard" is a
+        // readability trap nobody wins. The only PAGED read the sidecar serves — a whole-world
+        // market does not fit in one response.
+        .route("/market", get(market))
         .route_layer(middleware::from_fn_with_state(state.clone(), gate));
 
     let app = Router::new()
@@ -790,6 +804,60 @@ async fn houses(State(st): State<AppState>) -> impl IntoResponse {
     }
 }
 
+/// The shard's published ruleset: expansion, which optional systems are on, skill/stat caps,
+/// account and house limits, champion scroll rules, the save/restart schedule. Served from the
+/// store, so it answers during a shard outage with the last-known ruleset — which is the whole
+/// point, since a rules page that goes blank when the shard restarts is worse than a stale one.
+///
+/// `{"ruleset": null}` means the shard has never published one (an old plugin, or
+/// `Bridge.RulesetEnabled=false`), which the website renders differently from a published ruleset.
+async fn ruleset(State(st): State<AppState>) -> impl IntoResponse {
+    match st.store.ruleset().await {
+        Ok(r) => (StatusCode::OK, Json(json!({ "ruleset": r }))),
+        Err(e) => (
+            StatusCode::INTERNAL_SERVER_ERROR,
+            Json(json!({"error": e.to_string()})),
+        ),
+    }
+}
+
+/// Every points/loyalty leaderboard the shard publishes: one entry per point system, each with its
+/// display name (literal and/or cliloc), max points, participant count and top N. Store-backed like
+/// the other boards, so the site's leaderboards page renders during a shard outage — which matters
+/// more here than elsewhere, since these are month-scale standings that a restart must not blank.
+async fn points(State(st): State<AppState>) -> impl IntoResponse {
+    match st.store.points_boards_all().await {
+        Ok(boards) => (StatusCode::OK, Json(json!({"boards": boards}))),
+        Err(e) => (
+            StatusCode::INTERNAL_SERVER_ERROR,
+            Json(json!({"error": e.to_string()})),
+        ),
+    }
+}
+
+/// One system's board by its `PointsType` name (`QueensLoyalty`, `CleanUpBritannia`, …).
+///
+/// 404 rather than an empty board when the system is unknown: the shard publishes only the systems
+/// it shows on the loyalty gump (or the explicit `Bridge.cfg PointsSystems` list), so "no such
+/// board" and "a board with nobody on it" are different answers and the website renders them
+/// differently.
+async fn points_system(
+    State(st): State<AppState>,
+    Path(system): Path<String>,
+) -> impl IntoResponse {
+    match st.store.points_board(&system).await {
+        Ok(Some(board)) => (StatusCode::OK, Json(board)),
+        Ok(None) => (
+            StatusCode::NOT_FOUND,
+            Json(json!({"error": "unknown points system", "system": system})),
+        ),
+        Err(e) => (
+            StatusCode::INTERNAL_SERVER_ERROR,
+            Json(json!({"error": e.to_string()})),
+        ),
+    }
+}
+
 /// The current online population: total plus per-facet and per-region counts. This is the most
 /// recent `presence.online` snapshot from the event store (so it survives a sidecar restart); the
 /// live `presence.online` stream keeps it current, and `GET /history?kind=presence.online` gives the
@@ -810,6 +878,54 @@ async fn online(State(st): State<AppState>) -> impl IntoResponse {
     }
 }
 
+#[derive(Deserialize)]
+struct PageQuery {
+    limit: Option<i64>,
+    offset: Option<i64>,
+}
+
+/// The player-vendor market index: every vendor's shop name, owner, location and priced inventory,
+/// as the shard last published it. Store-backed like the other boards, which is what lets the
+/// website's market page render (labelled stale) while the shard is down.
+///
+/// Paged — `?limit=&offset=`, limit clamped to 1..1000, default 200 — because this is the one board
+/// that can be a whole world's inventory. `total` is returned alongside so the caller knows when to
+/// stop rather than paging until it sees a short page, which would race a concurrent sweep.
+///
+/// The frames are served VERBATIM, including owner names and coordinates. That is not an oversight:
+/// the sidecar defines no audiences (docs/link/v3.md §3.2). Deciding who may see a vendor's owner
+/// or whereabouts is the website's job and is admin-configurable there.
+async fn market(State(st): State<AppState>, Query(q): Query<PageQuery>) -> impl IntoResponse {
+    let limit = q.limit.unwrap_or(200);
+    let offset = q.offset.unwrap_or(0);
+
+    let total = match st.store.vendors_count().await {
+        Ok(n) => n,
+        Err(e) => {
+            return (
+                StatusCode::INTERNAL_SERVER_ERROR,
+                Json(json!({"error": e.to_string()})),
+            )
+        }
+    };
+
+    match st.store.vendors_page(limit, offset).await {
+        Ok(vendors) => (
+            StatusCode::OK,
+            Json(json!({
+                "vendors": vendors,
+                "total": total,
+                "limit": limit.clamp(1, 1000),
+                "offset": offset.max(0),
+            })),
+        ),
+        Err(e) => (
+            StatusCode::INTERNAL_SERVER_ERROR,
+            Json(json!({"error": e.to_string()})),
+        ),
+    }
+}
+
 // ---- websocket ----
 
 async fn ws_upgrade(ws: WebSocketUpgrade, State(state): State<AppState>) -> impl IntoResponse {