Add CodeNomad plugin bridge for opencode

packages/server/src/plugins/channel.ts

@@ -0,0 +1,55 @@
+import type { FastifyReply } from "fastify"
+import type { Logger } from "../logger"
+
+export interface PluginOutboundEvent {
+  type: string
+  properties?: Record<string, unknown>
+}
+
+interface ClientConnection {
+  reply: FastifyReply
+  workspaceId: string
+}
+
+export class PluginChannelManager {
+  private readonly clients = new Set<ClientConnection>()
+
+  constructor(private readonly logger: Logger) {}
+
+  register(workspaceId: string, reply: FastifyReply) {
+    const connection: ClientConnection = { workspaceId, reply }
+    this.clients.add(connection)
+    this.logger.debug({ workspaceId }, "Plugin SSE client connected")
+
+    let closed = false
+    const close = () => {
+      if (closed) return
+      closed = true
+      this.clients.delete(connection)
+      this.logger.debug({ workspaceId }, "Plugin SSE client disconnected")
+    }
+
+    return { close }
+  }
+
+  send(workspaceId: string, event: PluginOutboundEvent) {
+    for (const client of this.clients) {
+      if (client.workspaceId !== workspaceId) continue
+      this.write(client.reply, event)
+    }
+  }
+
+  broadcast(event: PluginOutboundEvent) {
+    for (const client of this.clients) {
+      this.write(client.reply, event)
+    }
+  }
+
+  private write(reply: FastifyReply, event: PluginOutboundEvent) {
+    try {
+      reply.raw.write(`data: ${JSON.stringify(event)}\n\n`)
+    } catch (error) {
+      this.logger.warn({ err: error }, "Failed to write plugin SSE event")
+    }
+  }
+}