From a9b8c3d2c994975460819384803c84b830771e6a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Daniel=20B=C3=BCchele?= <danielbuechele@fb.com>
Date: Fri, 10 Aug 2018 09:00:20 -0700
Subject: [PATCH] startup time tracking

Summary: Adds tracking from opening the application to the interface being shown.

Reviewed By: passy

Differential Revision: D9239037

fbshipit-source-id: eba60a9e839f9cc2b7a3c8706c6b9d63acb854b4
---
 src/App.js      | 23 +++++++++++++++--------
 static/index.js | 16 +++++++++++++++-
 2 files changed, 30 insertions(+), 9 deletions(-)

diff --git a/src/App.js b/src/App.js
index 24ea397d3..d4b3042a8 100644
--- a/src/App.js
+++ b/src/App.js
@@ -16,6 +16,7 @@ import BugReporterDialog from './chrome/BugReporterDialog.js';
 import ErrorBar from './chrome/ErrorBar.js';
 import PluginContainer from './PluginContainer.js';
 import PluginManager from './chrome/PluginManager.js';
+import {ipcRenderer} from 'electron';
 
 import type Logger from './fb-stubs/Logger.js';
 import type BugReporter from './fb-stubs/BugReporter.js';
@@ -33,13 +34,18 @@ type Props = {
 };
 
 export class App extends React.Component<Props> {
-  constructor(props: Props) {
-    performance.mark('init');
-    super(props);
-  }
-
   componentDidMount() {
-    this.props.logger.trackTimeSince('init');
+    // track time since launch
+    const [s, ns] = process.hrtime();
+    const launchEndTime = s * 1e3 + ns / 1e6;
+    ipcRenderer.on('getLaunchTime', (event, launchStartTime) => {
+      this.props.logger.track(
+        'performance',
+        'launchTime',
+        launchEndTime - launchStartTime,
+      );
+    });
+    ipcRenderer.send('getLaunchTime');
   }
 
   render() {
@@ -65,7 +71,6 @@ export class App extends React.Component<Props> {
     );
   }
 }
-
 export default connect(
   ({
     application: {pluginManagerVisible, bugDialogVisible, leftSidebarVisible},
@@ -77,5 +82,7 @@ export default connect(
     selectedDevice,
     error,
   }),
-  {toggleBugDialogVisible},
+  {
+    toggleBugDialogVisible,
+  },
 )(App);
diff --git a/static/index.js b/static/index.js
index fa3a6f304..9f3cae33c 100644
--- a/static/index.js
+++ b/static/index.js
@@ -4,7 +4,11 @@
  * LICENSE file in the root directory of this source tree.
  * @format
  */
-const {app, BrowserWindow} = require('electron');
+
+const [s, ns] = process.hrtime();
+let launchStartTime = s * 1e3 + ns / 1e6;
+
+const {app, BrowserWindow, ipcMain} = require('electron');
 const path = require('path');
 const url = require('url');
 const fs = require('fs');
@@ -128,6 +132,16 @@ app.on('ready', function() {
     installExtension(REDUX_DEVTOOLS.id);
   }
 });
+
+ipcMain.on('getLaunchTime', event => {
+  if (launchStartTime) {
+    event.sender.send('getLaunchTime', launchStartTime);
+    // set launchTime to null to only report it once, to prevents reporting wrong
+    // launch times for example after reloading the renderer process
+    launchStartTime = null;
+  }
+});
+
 function tryCreateWindow() {
   if (appReady && pluginsCompiled) {
     win = new BrowserWindow({