fix: Fix duplicated WebSocket connection created when acquiring conne…

…ction before one established

src/adapters/action/dispatcher-ws.spec.ts

@@ -29,7 +29,7 @@ describe("DispatcherWs", () => {
     }).toThrow(MastoUnexpectedError);
   });
 
-  it("can be disposed", async () => {
+  it("can be disposed", () => {
     const connector = new WebSocketConnectorImpl({
       constructorParameters: ["wss://example.com"],
     });
@@ -41,8 +41,6 @@ describe("DispatcherWs", () => {
     );
 
     dispatcher[Symbol.dispose]();
-    await expect(() => connector.acquire()).rejects.toThrow(
-      MastoWebSocketError,
-    );
+    expect(() => connector.acquire()).toThrow(MastoWebSocketError);
   });
 });

src/adapters/action/dispatcher-ws.ts

@@ -24,7 +24,7 @@ export class WebSocketActionDispatcher
 
   dispatch<T>(action: WebSocketAction): T {
     if (action.type === "close") {
-      this.connector.close();
+      this.connector.kill();
       return {} as T;
     }
 
@@ -50,6 +50,6 @@ export class WebSocketActionDispatcher
   }
 
   [Symbol.dispose](): void {
-    this.connector.close();
+    this.connector.kill();
   }
 }

src/adapters/ws/web-socket-connector.spec.ts

@@ -18,15 +18,15 @@ describe("WebSocketConnector", () => {
     expect(ws1).toBe(ws2);
 
     server.close();
-    connector.close();
+    connector.kill();
   });
 
   it("rejects if WebSocket closes", async () => {
     const connector = new WebSocketConnectorImpl({
       constructorParameters: [`ws://localhost:0`],
     });
     const promise = connector.acquire();
-    connector.close();
+    connector.kill();
 
     await expect(promise).rejects.toBeInstanceOf(MastoWebSocketError);
   });

src/adapters/ws/web-socket-connector.ts

@@ -18,45 +18,42 @@ interface WebSocketConnectorImplProps {
 export class WebSocketConnectorImpl implements WebSocketConnector {
   private ws?: WebSocket;
 
+  private killed = false;
   private queue: PromiseWithResolvers<WebSocket>[] = [];
   private backoff: ExponentialBackoff;
 
-  private closed = false;
-  private initialized = false;
-
   constructor(
     private readonly props: WebSocketConnectorImplProps,
     private readonly logger?: Logger,
   ) {
     this.backoff = new ExponentialBackoff({
       maxAttempts: this.props.maxAttempts,
     });
+    this.spawn();
   }
 
-  async acquire(): Promise<WebSocket> {
-    if (this.closed) {
+  acquire(): Promise<WebSocket> {
+    if (this.killed) {
       throw new MastoWebSocketError("WebSocket closed");
     }
 
-    this.init();
-
     if (this.ws != undefined) {
-      return this.ws;
+      return Promise.resolve(this.ws);
     }
 
     const promiseWithResolvers = createPromiseWithResolvers<WebSocket>();
     this.queue.push(promiseWithResolvers);
-    return await promiseWithResolvers.promise;
+    return promiseWithResolvers.promise;
   }
 
   async *[Symbol.asyncIterator](): AsyncIterableIterator<WebSocket> {
-    while (!this.closed) {
+    while (!this.killed) {
       yield await this.acquire();
     }
   }
 
-  close(): void {
-    this.closed = true;
+  kill(): void {
+    this.killed = true;
     this.ws?.close();
     this.backoff.clear();
 
@@ -67,14 +64,8 @@ export class WebSocketConnectorImpl implements WebSocketConnector {
     this.queue = [];
   }
 
-  private async init() {
-    if (this.initialized) {
-      return;
-    }
-
-    this.initialized = true;
-
-    while (!this.closed) {
+  private async spawn() {
+    while (!this.killed) {
       this.ws?.close();
 
       try {
@@ -114,6 +105,7 @@ export class WebSocketConnectorImpl implements WebSocketConnector {
         ),
       );
     }
+
     this.queue = [];
   }
 }

src/adapters/ws/web-socket-subscription.spec.ts

@@ -8,24 +8,6 @@ import { WebSocketSubscription } from "./web-socket-subscription";
 import { WebSocketSubscriptionCounterImpl } from "./web-socket-subscription-counter";
 
 describe("WebSocketSubscription", () => {
-  it("doesn't do anything if no connection was established", async () => {
-    const logger = createLogger();
-
-    const subscription = new WebSocketSubscription(
-      new WebSocketConnectorImpl(
-        { constructorParameters: ["ws://localhost:0"] },
-        logger,
-      ),
-      new WebSocketSubscriptionCounterImpl(),
-      new SerializerNativeImpl(),
-      "public",
-      logger,
-    );
-
-    const res = subscription.unsubscribe();
-    expect(res).toBeUndefined();
-  });
-
   it("implements async iterator", async () => {
     const logger = createLogger();
     const port = await getPort();
@@ -43,12 +25,12 @@ describe("WebSocketSubscription", () => {
       });
     });
 
-    const connection = new WebSocketConnectorImpl(
+    const connector = new WebSocketConnectorImpl(
       { constructorParameters: [`ws://localhost:${port}`] },
       logger,
     );
     const subscription = new WebSocketSubscription(
-      connection,
+      connector,
       new WebSocketSubscriptionCounterImpl(),
       new SerializerNativeImpl(),
       "public",
@@ -63,7 +45,7 @@ describe("WebSocketSubscription", () => {
 
     expect(value).toBe("123");
 
-    connection.close();
+    connector.kill();
     server.close();
   });
 });

src/interfaces/ws.ts

@@ -2,7 +2,7 @@ import { type WebSocket } from "isomorphic-ws";
 
 export interface WebSocketConnector extends AsyncIterable<WebSocket> {
   acquire(): Promise<WebSocket>;
-  close(): void;
+  kill(): void;
 }
 
 export interface WebSocketSubscriptionCounter {

src/mastodon/streaming/client.ts

@@ -10,7 +10,6 @@ export interface SubscribeHashtagParams {
 
 export interface Subscription extends AsyncIterable<Event>, Disposable {
   values(): AsyncIterableIterator<Event>;
-
   unsubscribe(): void;
 }
 

tests/streaming/connections.spec.ts

@@ -1,25 +1,27 @@
 import assert from "node:assert";
+import crypto from "node:crypto";
 
 it("maintains connections for the event even if other handlers closed it", async () => {
+  const tag = `tag_${crypto.randomBytes(4).toString("hex")}`;
   await using alice = await sessions.acquire({ waitForWs: true });
 
-  using subscription1 = alice.ws.hashtag.subscribe({ tag: "test" });
-  using subscription2 = alice.ws.hashtag.subscribe({ tag: "test" });
+  using subscription1 = alice.ws.hashtag.subscribe({ tag });
+  using subscription2 = alice.ws.hashtag.subscribe({ tag });
 
   const promise1 = subscription1.values().take(1).toArray();
   const promise2 = subscription2.values().take(2).toArray();
 
   // Dispatch event for subscription1 to establish connection
   const status1 = await alice.rest.v1.statuses.create({
-    status: "#test",
+    status: `#${tag}`,
     visibility: "public",
   });
   await promise1;
   subscription1.unsubscribe();
 
   // subscription1 is now closed, so status2 will only be dispatched to subscription2
   const status2 = await alice.rest.v1.statuses.create({
-    status: "#test",
+    status: `#${tag}`,
     visibility: "public",
   });
 
@@ -37,16 +39,17 @@ it("maintains connections for the event even if other handlers closed it", async
 });
 
 it("maintains connections for the event if unsubscribe called twice", async () => {
+  const tag = `tag_${crypto.randomBytes(4).toString("hex")}`;
   await using alice = await sessions.acquire({ waitForWs: true });
 
-  using subscription1 = alice.ws.hashtag.subscribe({ tag: "test" });
-  using subscription2 = alice.ws.hashtag.subscribe({ tag: "test" });
+  using subscription1 = alice.ws.hashtag.subscribe({ tag });
+  using subscription2 = alice.ws.hashtag.subscribe({ tag });
 
   const promise1 = subscription1.values().take(1).toArray();
   const promise2 = subscription2.values().take(2).toArray();
 
   const status1 = await alice.rest.v1.statuses.create({
-    status: "#test",
+    status: `#${tag}`,
     visibility: "public",
   });
   await promise1;
@@ -56,7 +59,7 @@ it("maintains connections for the event if unsubscribe called twice", async () =
   subscription1.unsubscribe();
 
   const status2 = await alice.rest.v1.statuses.create({
-    status: "#test",
+    status: `#${tag}`,
     visibility: "public",
   });
 
@@ -74,17 +77,18 @@ it("maintains connections for the event if unsubscribe called twice", async () =
 });
 
 it("maintains connections for the event if another handler called unsubscribe before connection established", async () => {
+  const tag = `tag_${crypto.randomBytes(4).toString("hex")}`;
   await using alice = await sessions.acquire({ waitForWs: true });
 
-  using subscription1 = alice.ws.hashtag.subscribe({ tag: "test" });
-  using subscription2 = alice.ws.hashtag.subscribe({ tag: "test" });
+  using subscription1 = alice.ws.hashtag.subscribe({ tag });
+  using subscription2 = alice.ws.hashtag.subscribe({ tag });
 
   subscription1.unsubscribe();
 
   const promise2 = subscription2.values().take(1).toArray();
 
   const status1 = await alice.rest.v1.statuses.create({
-    status: "#test",
+    status: `#${tag}`,
     visibility: "public",
   });