feat: collab redis extension with server affinity (#1873)

* feat(collab): better redis extension
* move types to own file
* debug logging
* fix: graceful collab shutdown
* rename default prefix
* pass wsAdapter to gateway
* expose event handler
* unique collab serverId generation
* uninstall @hocuspocus/extension-redis package
* expose more functions
* sync with latest
* cleanup
* fastify router options
* cleanup type

apps/server/src/collaboration/extensions/redis-sync/ws-socket-wrapper.ts

@@ -0,0 +1,47 @@
+import { EventEmitter } from 'events';
+import type WebSocket from 'ws';
+
+/**
+ * Wrapper around ws WebSocket that only receives events via emit().
+ * This prevents double-handling when used with RedisSyncExtension.
+ */
+export class WsSocketWrapper extends EventEmitter {
+  private ws: WebSocket;
+  readyState = 1;
+
+  constructor(ws: WebSocket) {
+    super();
+    this.ws = ws;
+    this.once('close', () => {
+      this.readyState = 3;
+    });
+  }
+
+  close(code?: number, reason?: string) {
+    if (this.readyState !== 1) return;
+    this.readyState = 3;
+    try {
+      this.ws.close(code, reason);
+    } catch (e) {
+      // Socket already closed
+    }
+  }
+
+  ping() {
+    if (this.readyState !== 1) return;
+    try {
+      this.ws.ping();
+    } catch (e) {
+      // Socket already closed
+    }
+  }
+
+  send(message: Uint8Array) {
+    if (this.readyState !== 1) return;
+    try {
+      this.ws.send(message);
+    } catch (e) {
+      // Socket already closed
+    }
+  }
+}