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Devin Zuczek
58 lines
2.6 KiB
Markdown
58 lines
2.6 KiB
Markdown
# notify
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Notifications Worker served on the `notify` subdomain. Hosts a SignalR hub at
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`/hub/v1`.
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The hub is implemented as a **Durable Object** (`NotificationsHub`) speaking the
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SignalR JSON Hub Protocol over a hibernatable WebSocket. A single global DO
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instance holds the shared hub state (one process across all connections).
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## Endpoints
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- `POST /hub/v1/negotiate` — SignalR negotiation. Returns a `connectionId` /
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`connectionToken` and advertises the WebSocket transport. The token is passed
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back as `?id=` on the WebSocket connect.
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- `GET /hub/v1` (WebSocket upgrade) — the hub. Forwarded to the Durable Object.
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Non-upgrade requests get `426`.
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- `POST /internal/notify` — `{ playerId, notificationType, data? }`. Send to a
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player's connections, queueing if they're offline. **Admin-gated**: requires a
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Bearer token carrying an admin role (`developer`/`moderator`) in its `role` claim.
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- `POST /internal/broadcast` — `{ notificationType, data? }`. Send to every
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connected client. Same admin-role gate as `/internal/notify`.
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- `POST /internal/coach-message-all` — `{ messageContent }`. Broadcast a coach/system
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`MessageReceived` to every connected client (online-only; not persisted). Same
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admin-role gate.
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## Hub protocol
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1. Client `POST /hub/v1/negotiate`, then opens a WebSocket to `/hub/v1?id=<token>`.
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2. Handshake: client sends `{"protocol":"json","version":1}␞`, server replies
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`{}␞` (`␞` = record separator `0x1e`).
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3. Server immediately sends the `OnConnect` invocation on connect.
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4. Client→server invocations:
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- `SubscribeToPlayers({ playerIds })` — replaces this connection's
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subscriptions and flushes any queued notifications for those players.
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- `GetSubscriptions()` → completion with the subscribed player id array.
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5. Server→client: `Notification` invocations carrying a JSON string
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`{ Id: <PushNotificationId>, Msg: { ... } }`.
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6. Pings (type 6) are echoed.
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## State
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Held in the DO's SQLite so it survives hibernation:
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- `subscriptions(connectionId, playerId)` — serves both the connection→players
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and player→connections lookups.
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- `pending(id, playerId, payload)` — per-player queue delivered once the player
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subscribes.
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A connection's rows are removed on `webSocketClose`.
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## TODO before production
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- Authenticate the `/internal/*` endpoints (or move them to a service binding /
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RPC reachable only by other workers).
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- Wire the real callers (relationships, gifts, storefront, events, chat, …) to
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push through `notifyPlayer` / `broadcast`.
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- Consider server-initiated keepalive pings if clients rely on them.
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