Refactor browser connection performance tracking

Reviewed By: lblasa

Differential Revision: D51158256

fbshipit-source-id: 17e020dd3c26ac73bf2cf0ceb4c664638c6778e9

desktop/flipper-server-core/src/server/attachSocketServer.tsx

@@ -27,7 +27,6 @@ import {
 } from 'flipper-server-companion';
 import {URLSearchParams} from 'url';
 import {tracker} from '../tracker';
-import {performance} from 'perf_hooks';
 import {getFlipperServerConfig} from '../FlipperServerConfig';
 
 const safe = (f: () => void) => {
@@ -53,14 +52,6 @@ export function attachSocketServer(
   server: FlipperServerImpl,
   companionEnv: FlipperServerCompanionEnv,
 ) {
-  const t0 = performance.now();
-  const browserConnectionTimeout = setTimeout(() => {
-    tracker.track('browser-connection-created', {
-      successful: false,
-      timeMS: performance.now() - t0,
-    });
-  }, 20000);
-
   socket.on('connection', (client, req) => {
     const clientAddress =
       (req.socket.remoteAddress &&
@@ -74,11 +65,7 @@ export function attachSocketServer(
       clearTimeout(disconnectTimeout);
     }
 
-    clearTimeout(browserConnectionTimeout);
-    tracker.track('browser-connection-created', {
-      successful: true,
-      timeMS: performance.now() - t0,
-    });
+    server.emit('browser-connection-created', {});
 
     let connected = true;
 

desktop/flipper-server-core/src/tracker.tsx

@@ -54,6 +54,7 @@ type TrackerEvents = {
   'browser-connection-created': {
     successful: boolean;
     timeMS: number;
+    timedOut: boolean;
   };
   'app-connection-created': AppConnectionPayload;
   'app-connection-secure-attempt': AppConnectionPayload;