fix: interrupted WebSocket connection not closed by LiveQuery server (parse-community#8012)

Author: pash2048

spec/ParseWebSocketServer.spec.js

@@ -23,6 +23,7 @@ describe('ParseWebSocketServer', function () {
     ws.readyState = 0;
     ws.OPEN = 0;
     ws.ping = jasmine.createSpy('ping');
+    ws.terminate = () => {};
 
     parseWebSocketServer.onConnection(ws);
 
@@ -75,6 +76,30 @@ describe('ParseWebSocketServer', function () {
     expect(wssError).toBe('Invalid Packet');
   });
 
+  it('closes interrupted connection', async () => {
+    const onConnectCallback = jasmine.createSpy('onConnectCallback');
+    const http = require('http');
+    const server = http.createServer();
+    const parseWebSocketServer = new ParseWebSocketServer(server, onConnectCallback, {
+      websocketTimeout: 5,
+    }).server;
+    const ws = new EventEmitter();
+    ws.readyState = 0;
+    ws.OPEN = 0;
+    ws.ping = jasmine.createSpy('ping');
+    ws.terminate = jasmine.createSpy('terminate');
+
+    parseWebSocketServer.onConnection(ws);
+
+    // Make sure callback is called
+    expect(onConnectCallback).toHaveBeenCalled();
+    await new Promise(resolve => setTimeout(resolve, 10));
+    expect(ws.ping).toHaveBeenCalled();
+    await new Promise(resolve => setTimeout(resolve, 10));
+    expect(ws.terminate).toHaveBeenCalled();
+    server.close();
+  });
+
   afterEach(function () {
     jasmine.restoreLibrary('ws', 'Server');
   });

src/LiveQuery/ParseWebSocketServer.js

@@ -14,17 +14,23 @@ export class ParseWebSocketServer {
       logger.info('Parse LiveQuery Server started running');
     };
     wss.onConnection = ws => {
+      ws.waitingForPong = false;
+      ws.on('pong', () => {
+        this.waitingForPong = false;
+      });
       ws.on('error', error => {
         logger.error(error.message);
         logger.error(inspect(ws, false));
       });
       onConnect(new ParseWebSocket(ws));
       // Send ping to client periodically
       const pingIntervalId = setInterval(() => {
-        if (ws.readyState == ws.OPEN) {
+        if (!ws.waitingForPong) {
           ws.ping();
+          ws.waitingForPong = true;
         } else {
           clearInterval(pingIntervalId);
+          ws.terminate();
         }
       }, config.websocketTimeout || 10 * 1000);
     };