Initial Commit

packages/networking/network/websocket-gateway/src/gateway/channel-ops.ts

@@ -0,0 +1,58 @@
+import type {
+    AuthContext,
+    ClientInfo,
+    GatewayAction,
+    Message,
+} from "../types/types.js";
+import type { ChannelManager } from "./channel-manager.js";
+
+export interface ChannelOpsDeps {
+    readonly clients: Map<string, ClientInfo>;
+    readonly channelMgr: ChannelManager;
+    readonly clock: () => number;
+    readonly runGate: (
+        ctx: AuthContext,
+        action: GatewayAction
+    ) => Promise<void>;
+    readonly requireAuthCtx: (clientId: string) => AuthContext;
+}
+
+export async function subscribeToChannel(
+    deps: ChannelOpsDeps,
+    channelName: string,
+    clientId: string,
+    topic: string
+): Promise<boolean> {
+    if (!deps.clients.has(clientId)) return false;
+    await deps.runGate(deps.requireAuthCtx(clientId), "channel.subscribe");
+    return deps.channelMgr.subscribe(channelName, clientId, topic).subscribed;
+}
+
+export function unsubscribeFromChannel(
+    channelMgr: ChannelManager,
+    channelName: string,
+    clientId: string,
+    topic: string
+): boolean {
+    return channelMgr.unsubscribe(channelName, clientId, topic).unsubscribed;
+}
+
+export async function publishToChannel(
+    deps: ChannelOpsDeps,
+    channelName: string,
+    senderId: string,
+    topic: string,
+    payload: unknown
+): Promise<{
+    readonly message: Message;
+    readonly recipients: string[];
+} | null> {
+    await deps.runGate(deps.requireAuthCtx(senderId), "channel.publish");
+    return deps.channelMgr.publish(
+        channelName,
+        senderId,
+        topic,
+        payload,
+        deps.clock()
+    );
+}