ui/src/frontend/index.ts - third_party/perfetto - Git at Google

 // Copyright (C) 2018 The Android Open Source Project
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //      http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.

 import '../tracks/all_frontend';

 import {applyPatches, Patch} from 'immer';
 import * as m from 'mithril';

 import {defer} from '../base/deferred';
 import {assertExists, reportError, setErrorHandler} from '../base/logging';
 import {forwardRemoteCalls} from '../base/remote';
 import {Actions} from '../common/actions';
 import {AggregateData} from '../common/aggregation_data';
 import {
   LogBoundsKey,
   LogEntriesKey,
   LogExists,
   LogExistsKey
 } from '../common/logs';
 import {MetricResult} from '../common/metric_data';
 import {CurrentSearchResults, SearchSummary} from '../common/search_data';

 import {AnalyzePage} from './analyze_page';
 import {loadAndroidBugToolInfo} from './android_bug_tool';
 import {initCssConstants} from './css_constants';
 import {maybeShowErrorDialog} from './error_dialog';
 import {installFileDropHandler} from './file_drop_handler';
 import {
   CounterDetails,
   CpuProfileDetails,
   Flow,
   globals,
   HeapProfileDetails,
   QuantizedLoad,
   SliceDetails,
   ThreadDesc,
   ThreadStateDetails
 } from './globals';
 import {HomePage} from './home_page';
 import {openBufferWithLegacyTraceViewer} from './legacy_trace_viewer';
 import {initLiveReloadIfLocalhost} from './live_reload';
 import {MetricsPage} from './metrics_page';
 import {postMessageHandler} from './post_message_handler';
 import {RecordPage, updateAvailableAdbDevices} from './record_page';
 import {Router} from './router';
 import {CheckHttpRpcConnection} from './rpc_http_dialog';
 import {taskTracker} from './task_tracker';
 import {TraceInfoPage} from './trace_info_page';
 import {ViewerPage} from './viewer_page';

 const EXTENSION_ID = 'lfmkphfpdbjijhpomgecfikhfohaoine';

 function isLocalhostTraceUrl(url: string): boolean {
   return ['127.0.0.1', 'localhost'].includes((new URL(url)).hostname);
 }

 /**
  * The API the main thread exposes to the controller.
  */
 class FrontendApi {
   constructor(private router: Router) {}

   patchState(patches: Patch[]) {
     const oldState = globals.state;
     globals.state = applyPatches(globals.state, patches);

     // If the visible time in the global state has been updated more recently
     // than the visible time handled by the frontend @ 60fps, update it. This
     // typically happens when restoring the state from a permalink.
     globals.frontendLocalState.mergeState(globals.state.frontendLocalState);

     // Only redraw if something other than the frontendLocalState changed.
     for (const key in globals.state) {
       if (key !== 'frontendLocalState' && key !== 'visibleTracks' &&
           oldState[key] !== globals.state[key]) {
         this.redraw();
         return;
       }
     }
   }

   // TODO: we can't have a publish method for each batch of data that we don't
   // want to keep in the global state. Figure out a more generic and type-safe
   // mechanism to achieve this.

   publishOverviewData(data: {[key: string]: QuantizedLoad|QuantizedLoad[]}) {
     for (const [key, value] of Object.entries(data)) {
       if (!globals.overviewStore.has(key)) {
         globals.overviewStore.set(key, []);
       }
       if (value instanceof Array) {
         globals.overviewStore.get(key)!.push(...value);
       } else {
         globals.overviewStore.get(key)!.push(value);
       }
     }
     globals.rafScheduler.scheduleRedraw();
   }

   publishTrackData(args: {id: string, data: {}}) {
     globals.setTrackData(args.id, args.data);
     if ([LogExistsKey, LogBoundsKey, LogEntriesKey].includes(args.id)) {
       const data = globals.trackDataStore.get(LogExistsKey) as LogExists;
       if (data && data.exists) globals.rafScheduler.scheduleFullRedraw();
     } else {
       globals.rafScheduler.scheduleRedraw();
     }
   }

   publishQueryResult(args: {id: string, data: {}}) {
     globals.queryResults.set(args.id, args.data);
     this.redraw();
   }

   publishThreads(data: ThreadDesc[]) {
     globals.threads.clear();
     data.forEach(thread => {
       globals.threads.set(thread.utid, thread);
     });
     this.redraw();
   }

   publishSliceDetails(click: SliceDetails) {
     globals.sliceDetails = click;
     this.redraw();
   }

   publishThreadStateDetails(click: ThreadStateDetails) {
     globals.threadStateDetails = click;
     this.redraw();
   }

   publishConnectedFlows(connectedFlows: Flow[]) {
     globals.connectedFlows = connectedFlows;
     // Call resetFlowFocus() each time connectedFlows is updated to correctly
     // navigate using hotkeys.
     this.resetFlowFocus();
     this.redraw();
   }

   // If a chrome slice is selected and we have any flows in connectedFlows
   // we will find the flows on the right and left of that slice to set a default
   // focus. In all other cases the focusedFlowId(Left|Right) will be set to -1.
   resetFlowFocus() {
     globals.frontendLocalState.focusedFlowIdLeft = -1;
     globals.frontendLocalState.focusedFlowIdRight = -1;
     if (globals.state.currentSelection?.kind === 'CHROME_SLICE') {
       const sliceId = globals.state.currentSelection.id;
       for (const flow of globals.connectedFlows) {
         if (flow.begin.sliceId === sliceId) {
           globals.frontendLocalState.focusedFlowIdRight = flow.id;
         }
         if (flow.end.sliceId === sliceId) {
           globals.frontendLocalState.focusedFlowIdLeft = flow.id;
         }
       }
     }
   }

   publishSelectedFlows(selectedFlows: Flow[]) {
     globals.selectedFlows = selectedFlows;
     this.redraw();
   }

   publishCounterDetails(click: CounterDetails) {
     globals.counterDetails = click;
     this.redraw();
   }

   publishHeapProfileDetails(click: HeapProfileDetails) {
     globals.heapProfileDetails = click;
     this.redraw();
   }

   publishCpuProfileDetails(details: CpuProfileDetails) {
     globals.cpuProfileDetails = details;
     this.redraw();
   }

   publishFileDownload(args: {file: File, name?: string}) {
     const url = URL.createObjectURL(args.file);
     const a = document.createElement('a');
     a.href = url;
     a.download = args.name !== undefined ? args.name : args.file.name;
     document.body.appendChild(a);
     a.click();
     document.body.removeChild(a);
     URL.revokeObjectURL(url);
   }

   publishLoading(numQueuedQueries: number) {
     globals.numQueuedQueries = numQueuedQueries;
     // TODO(hjd): Clean up loadingAnimation given that this now causes a full
     // redraw anyways. Also this should probably just go via the global state.
     globals.rafScheduler.scheduleFullRedraw();
   }

   // For opening JSON/HTML traces with the legacy catapult viewer.
   publishLegacyTrace(args: {data: ArrayBuffer, size: number}) {
     const arr = new Uint8Array(args.data, 0, args.size);
     const str = (new TextDecoder('utf-8')).decode(arr);
     openBufferWithLegacyTraceViewer('trace.json', str, 0);
     globals.dispatch(Actions.clearConversionInProgress({}));
   }

   publishBufferUsage(args: {percentage: number}) {
     globals.setBufferUsage(args.percentage);
     this.redraw();
   }

   publishSearch(args: SearchSummary) {
     globals.searchSummary = args;
     this.redraw();
   }

   publishSearchResult(args: CurrentSearchResults) {
     globals.currentSearchResults = args;
     this.redraw();
   }

   publishRecordingLog(args: {logs: string}) {
     globals.setRecordingLog(args.logs);
     this.redraw();
   }

   publishTraceErrors(numErrors: number) {
     globals.setTraceErrors(numErrors);
     this.redraw();
   }

   publishMetricError(error: string) {
     globals.setMetricError(error);
     globals.logging.logError(error, false);
     this.redraw();
   }

   publishMetricResult(metricResult: MetricResult) {
     globals.setMetricResult(metricResult);
     this.redraw();
   }

   publishAggregateData(args: {data: AggregateData, kind: string}) {
     globals.setAggregateData(args.kind, args.data);
     this.redraw();
   }

   private redraw(): void {
     if (globals.state.route &&
         globals.state.route !== this.router.getRouteFromHash()) {
       this.router.setRouteOnHash(globals.state.route);
     }

     globals.rafScheduler.scheduleFullRedraw();
   }
 }

 function setExtensionAvailability(available: boolean) {
   globals.dispatch(Actions.setExtensionAvailable({
     available,
   }));
 }

 function setupContentSecurityPolicy() {
   // Note: self and sha-xxx must be quoted, urls data: and blob: must not.
   const policy = {
     'default-src': [
       `'self'`,
       // Google Tag Manager bootstrap.
       `'sha256-LirUKeorCU4uRNtNzr8tlB11uy8rzrdmqHCX38JSwHY='`,
     ],
     'script-src': [
       `'self'`,
       'https://*.google.com',
       'https://*.googleusercontent.com',
       'https://www.googletagmanager.com',
       'https://www.google-analytics.com',
     ],
     'object-src': ['none'],
     'connect-src': [
       `'self'`,
       'http://127.0.0.1:9001',  // For trace_processor_shell --httpd.
       'https://www.google-analytics.com',
       'https://*.googleapis.com',  // For Google Cloud Storage fetches.
       'blob:',
       'data:',
     ],
     'img-src': [
       `'self'`,
       'data:',
       'blob:',
       'https://www.google-analytics.com',
       'https://www.googletagmanager.com',
     ],
     'navigate-to': ['https://*.perfetto.dev', 'self'],
   };
   const meta = document.createElement('meta');
   meta.httpEquiv = 'Content-Security-Policy';
   let policyStr = '';
   for (const [key, list] of Object.entries(policy)) {
     policyStr += `${key} ${list.join(' ')}; `;
   }
   meta.content = policyStr;
   document.head.appendChild(meta);
 }

 function main() {
   setupContentSecurityPolicy();

   // Load the css. The load is asynchronous and the CSS is not ready by the time
   // appenChild returns.
   const cssLoadPromise = defer<void>();
   const css = document.createElement('link');
   css.rel = 'stylesheet';
   css.href = globals.root + 'perfetto.css';
   css.onload = () => cssLoadPromise.resolve();
   css.onerror = (err) => cssLoadPromise.reject(err);
   const favicon = document.head.querySelector('#favicon') as HTMLLinkElement;
   if (favicon) favicon.href = globals.root + 'assets/favicon.png';

   // Load the script to detect if this is a Googler (see comments on globals.ts)
   // and initialize GA after that (or after a timeout if something goes wrong).
   const script = document.createElement('script');
   script.src =
       'https://storage.cloud.google.com/perfetto-ui-internal/is_internal_user.js';
   script.async = true;
   script.onerror = () => globals.logging.initialize();
   script.onload = () => globals.logging.initialize();
   setTimeout(() => globals.logging.initialize(), 5000);

   document.head.append(script, css);

   // Add Error handlers for JS error and for uncaught exceptions in promises.
   setErrorHandler((err: string) => maybeShowErrorDialog(err));
   window.addEventListener('error', e => reportError(e));
   window.addEventListener('unhandledrejection', e => reportError(e));

   const controller = new Worker(globals.root + 'controller_bundle.js');
   const frontendChannel = new MessageChannel();
   const controllerChannel = new MessageChannel();
   const extensionLocalChannel = new MessageChannel();
   const errorReportingChannel = new MessageChannel();

   errorReportingChannel.port2.onmessage = (e) =>
       maybeShowErrorDialog(`${e.data}`);

   controller.postMessage(
       {
         frontendPort: frontendChannel.port1,
         controllerPort: controllerChannel.port1,
         extensionPort: extensionLocalChannel.port1,
         errorReportingPort: errorReportingChannel.port1,
       },
       [
         frontendChannel.port1,
         controllerChannel.port1,
         extensionLocalChannel.port1,
         errorReportingChannel.port1,
       ]);

   const dispatch =
       controllerChannel.port2.postMessage.bind(controllerChannel.port2);
   globals.initialize(dispatch, controller);
   globals.serviceWorkerController.install();

   const router = new Router(
       '/',
       {
         '/': HomePage,
         '/viewer': ViewerPage,
         '/record': RecordPage,
         '/query': AnalyzePage,
         '/metrics': MetricsPage,
         '/info': TraceInfoPage,
       },
       dispatch,
       globals.logging);
   forwardRemoteCalls(frontendChannel.port2, new FrontendApi(router));

   // We proxy messages between the extension and the controller because the
   // controller's worker can't access chrome.runtime.
   const extensionPort = window.chrome && chrome.runtime ?
       chrome.runtime.connect(EXTENSION_ID) :
       undefined;

   setExtensionAvailability(extensionPort !== undefined);

   if (extensionPort) {
     extensionPort.onDisconnect.addListener(_ => {
       setExtensionAvailability(false);
       // tslint:disable-next-line: no-unused-expression
       void chrome.runtime.lastError;  // Needed to not receive an error log.
     });
     // This forwards the messages from the extension to the controller.
     extensionPort.onMessage.addListener(
         (message: object, _port: chrome.runtime.Port) => {
           extensionLocalChannel.port2.postMessage(message);
         });
   }

   // This forwards the messages from the controller to the extension
   extensionLocalChannel.port2.onmessage = ({data}) => {
     if (extensionPort) extensionPort.postMessage(data);
   };

   // Put these variables in the global scope for better debugging.
   (window as {} as {m: {}}).m = m;
   (window as {} as {globals: {}}).globals = globals;
   (window as {} as {Actions: {}}).Actions = Actions;

   // Prevent pinch zoom.
   document.body.addEventListener('wheel', (e: MouseEvent) => {
     if (e.ctrlKey) e.preventDefault();
   }, {passive: false});

   cssLoadPromise.then(() => onCssLoaded(router));
 }

 function onCssLoaded(router: Router) {
   initCssConstants();
   // Clear all the contents of the initial page (e.g. the <pre> error message)
   // And replace it with the root <main> element which will be used by mithril.
   document.body.innerHTML = '<main></main>';
   const main = assertExists(document.body.querySelector('main'));
   globals.rafScheduler.domRedraw = () =>
       m.render(main, m(router.resolve(globals.state.route)));

   router.navigateToCurrentHash();

   // /?s=xxxx for permalinks.
   const stateHash = Router.param('s');
   const urlHash = Router.param('url');
   const androidBugTool = Router.param('openFromAndroidBugTool');
   if (typeof stateHash === 'string' && stateHash) {
     globals.dispatch(Actions.loadPermalink({
       hash: stateHash,
     }));
   } else if (typeof urlHash === 'string' && urlHash) {
     if (isLocalhostTraceUrl(urlHash)) {
       const fileName = urlHash.split('/').pop() || 'local_trace.pftrace';
       const request = fetch(urlHash)
                           .then(response => response.blob())
                           .then(blob => {
                             globals.dispatch(Actions.openTraceFromFile({
                               file: new File([blob], fileName),
                             }));
                           })
                           .catch(e => alert(`Could not load local trace ${e}`));
       taskTracker.trackPromise(request, 'Downloading local trace');
     } else {
       globals.dispatch(Actions.openTraceFromUrl({
         url: urlHash,
       }));
     }
   } else if (androidBugTool) {
     // TODO(hjd): Unify updateStatus and TaskTracker
     globals.dispatch(Actions.updateStatus({
       msg: 'Loading trace from ABT extension',
       timestamp: Date.now() / 1000
     }));
     const loadInfo = loadAndroidBugToolInfo();
     taskTracker.trackPromise(loadInfo, 'Loading trace from ABT extension');
     loadInfo
         .then(info => {
           globals.dispatch(Actions.openTraceFromFile({
             file: info.file,
           }));
         })
         .catch(e => {
           console.error(e);
         });
   }

   // Add support for opening traces from postMessage().
   window.addEventListener('message', postMessageHandler, {passive: true});

   // Will update the chip on the sidebar footer that notifies that the RPC is
   // connected. Has no effect on the controller (which will repeat this check
   // before creating a new engine).
   CheckHttpRpcConnection();
   initLiveReloadIfLocalhost();

   updateAvailableAdbDevices();
   try {
     navigator.usb.addEventListener(
         'connect', () => updateAvailableAdbDevices());
     navigator.usb.addEventListener(
         'disconnect', () => updateAvailableAdbDevices());
   } catch (e) {
     console.error('WebUSB API not supported');
   }
   installFileDropHandler();
 }

 main();
	// Copyright (C) 2018 The Android Open Source Project
	//
	// Licensed under the Apache License, Version 2.0 (the "License");
	// you may not use this file except in compliance with the License.
	// You may obtain a copy of the License at
	//
	// http://www.apache.org/licenses/LICENSE-2.0
	//
	// Unless required by applicable law or agreed to in writing, software
	// distributed under the License is distributed on an "AS IS" BASIS,
	// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	// See the License for the specific language governing permissions and
	// limitations under the License.

	import '../tracks/all_frontend';

	import {applyPatches, Patch} from 'immer';
	import * as m from 'mithril';

	import {defer} from '../base/deferred';
	import {assertExists, reportError, setErrorHandler} from '../base/logging';
	import {forwardRemoteCalls} from '../base/remote';
	import {Actions} from '../common/actions';
	import {AggregateData} from '../common/aggregation_data';
	import {
	LogBoundsKey,
	LogEntriesKey,
	LogExists,
	LogExistsKey
	} from '../common/logs';
	import {MetricResult} from '../common/metric_data';
	import {CurrentSearchResults, SearchSummary} from '../common/search_data';

	import {AnalyzePage} from './analyze_page';
	import {loadAndroidBugToolInfo} from './android_bug_tool';
	import {initCssConstants} from './css_constants';
	import {maybeShowErrorDialog} from './error_dialog';
	import {installFileDropHandler} from './file_drop_handler';
	import {
	CounterDetails,
	CpuProfileDetails,
	Flow,
	globals,
	HeapProfileDetails,
	QuantizedLoad,
	SliceDetails,
	ThreadDesc,
	ThreadStateDetails
	} from './globals';
	import {HomePage} from './home_page';
	import {openBufferWithLegacyTraceViewer} from './legacy_trace_viewer';
	import {initLiveReloadIfLocalhost} from './live_reload';
	import {MetricsPage} from './metrics_page';
	import {postMessageHandler} from './post_message_handler';
	import {RecordPage, updateAvailableAdbDevices} from './record_page';
	import {Router} from './router';
	import {CheckHttpRpcConnection} from './rpc_http_dialog';
	import {taskTracker} from './task_tracker';
	import {TraceInfoPage} from './trace_info_page';
	import {ViewerPage} from './viewer_page';

	const EXTENSION_ID = 'lfmkphfpdbjijhpomgecfikhfohaoine';

	function isLocalhostTraceUrl(url: string): boolean {
	return ['127.0.0.1', 'localhost'].includes((new URL(url)).hostname);
	}

	/**
	* The API the main thread exposes to the controller.
	*/
	class FrontendApi {
	constructor(private router: Router) {}

	patchState(patches: Patch[]) {
	const oldState = globals.state;
	globals.state = applyPatches(globals.state, patches);

	// If the visible time in the global state has been updated more recently
	// than the visible time handled by the frontend @ 60fps, update it. This
	// typically happens when restoring the state from a permalink.
	globals.frontendLocalState.mergeState(globals.state.frontendLocalState);

	// Only redraw if something other than the frontendLocalState changed.
	for (const key in globals.state) {
	if (key !== 'frontendLocalState' && key !== 'visibleTracks' &&
	oldState[key] !== globals.state[key]) {
	this.redraw();
	return;
	}
	}
	}

	// TODO: we can't have a publish method for each batch of data that we don't
	// want to keep in the global state. Figure out a more generic and type-safe
	// mechanism to achieve this.

	publishOverviewData(data: {[key: string]: QuantizedLoad\|QuantizedLoad[]}) {
	for (const [key, value] of Object.entries(data)) {
	if (!globals.overviewStore.has(key)) {
	globals.overviewStore.set(key, []);
	}
	if (value instanceof Array) {
	globals.overviewStore.get(key)!.push(...value);
	} else {
	globals.overviewStore.get(key)!.push(value);
	}
	}
	globals.rafScheduler.scheduleRedraw();
	}

	publishTrackData(args: {id: string, data: {}}) {
	globals.setTrackData(args.id, args.data);
	if ([LogExistsKey, LogBoundsKey, LogEntriesKey].includes(args.id)) {
	const data = globals.trackDataStore.get(LogExistsKey) as LogExists;
	if (data && data.exists) globals.rafScheduler.scheduleFullRedraw();
	} else {
	globals.rafScheduler.scheduleRedraw();
	}
	}

	publishQueryResult(args: {id: string, data: {}}) {
	globals.queryResults.set(args.id, args.data);
	this.redraw();
	}

	publishThreads(data: ThreadDesc[]) {
	globals.threads.clear();
	data.forEach(thread => {
	globals.threads.set(thread.utid, thread);
	});
	this.redraw();
	}

	publishSliceDetails(click: SliceDetails) {
	globals.sliceDetails = click;
	this.redraw();
	}

	publishThreadStateDetails(click: ThreadStateDetails) {
	globals.threadStateDetails = click;
	this.redraw();
	}

	publishConnectedFlows(connectedFlows: Flow[]) {
	globals.connectedFlows = connectedFlows;
	// Call resetFlowFocus() each time connectedFlows is updated to correctly
	// navigate using hotkeys.
	this.resetFlowFocus();
	this.redraw();
	}

	// If a chrome slice is selected and we have any flows in connectedFlows
	// we will find the flows on the right and left of that slice to set a default
	// focus. In all other cases the focusedFlowId(Left\|Right) will be set to -1.
	resetFlowFocus() {
	globals.frontendLocalState.focusedFlowIdLeft = -1;
	globals.frontendLocalState.focusedFlowIdRight = -1;
	if (globals.state.currentSelection?.kind === 'CHROME_SLICE') {
	const sliceId = globals.state.currentSelection.id;
	for (const flow of globals.connectedFlows) {
	if (flow.begin.sliceId === sliceId) {
	globals.frontendLocalState.focusedFlowIdRight = flow.id;
	}
	if (flow.end.sliceId === sliceId) {
	globals.frontendLocalState.focusedFlowIdLeft = flow.id;
	}
	}
	}
	}

	publishSelectedFlows(selectedFlows: Flow[]) {
	globals.selectedFlows = selectedFlows;
	this.redraw();
	}

	publishCounterDetails(click: CounterDetails) {
	globals.counterDetails = click;
	this.redraw();
	}

	publishHeapProfileDetails(click: HeapProfileDetails) {
	globals.heapProfileDetails = click;
	this.redraw();
	}

	publishCpuProfileDetails(details: CpuProfileDetails) {
	globals.cpuProfileDetails = details;
	this.redraw();
	}

	publishFileDownload(args: {file: File, name?: string}) {
	const url = URL.createObjectURL(args.file);
	const a = document.createElement('a');
	a.href = url;
	a.download = args.name !== undefined ? args.name : args.file.name;
	document.body.appendChild(a);
	a.click();
	document.body.removeChild(a);
	URL.revokeObjectURL(url);
	}

	publishLoading(numQueuedQueries: number) {
	globals.numQueuedQueries = numQueuedQueries;
	// TODO(hjd): Clean up loadingAnimation given that this now causes a full
	// redraw anyways. Also this should probably just go via the global state.
	globals.rafScheduler.scheduleFullRedraw();
	}

	// For opening JSON/HTML traces with the legacy catapult viewer.
	publishLegacyTrace(args: {data: ArrayBuffer, size: number}) {
	const arr = new Uint8Array(args.data, 0, args.size);
	const str = (new TextDecoder('utf-8')).decode(arr);
	openBufferWithLegacyTraceViewer('trace.json', str, 0);
	globals.dispatch(Actions.clearConversionInProgress({}));
	}

	publishBufferUsage(args: {percentage: number}) {
	globals.setBufferUsage(args.percentage);
	this.redraw();
	}

	publishSearch(args: SearchSummary) {
	globals.searchSummary = args;
	this.redraw();
	}

	publishSearchResult(args: CurrentSearchResults) {
	globals.currentSearchResults = args;
	this.redraw();
	}

	publishRecordingLog(args: {logs: string}) {
	globals.setRecordingLog(args.logs);
	this.redraw();
	}

	publishTraceErrors(numErrors: number) {
	globals.setTraceErrors(numErrors);
	this.redraw();
	}

	publishMetricError(error: string) {
	globals.setMetricError(error);
	globals.logging.logError(error, false);
	this.redraw();
	}

	publishMetricResult(metricResult: MetricResult) {
	globals.setMetricResult(metricResult);
	this.redraw();
	}

	publishAggregateData(args: {data: AggregateData, kind: string}) {
	globals.setAggregateData(args.kind, args.data);
	this.redraw();
	}

	private redraw(): void {
	if (globals.state.route &&
	globals.state.route !== this.router.getRouteFromHash()) {
	this.router.setRouteOnHash(globals.state.route);
	}

	globals.rafScheduler.scheduleFullRedraw();
	}
	}

	function setExtensionAvailability(available: boolean) {
	globals.dispatch(Actions.setExtensionAvailable({
	available,
	}));
	}

	function setupContentSecurityPolicy() {
	// Note: self and sha-xxx must be quoted, urls data: and blob: must not.
	const policy = {
	'default-src': [
	`'self'`,
	// Google Tag Manager bootstrap.
	`'sha256-LirUKeorCU4uRNtNzr8tlB11uy8rzrdmqHCX38JSwHY='`,
	],
	'script-src': [
	`'self'`,
	'https://*.google.com',
	'https://*.googleusercontent.com',
	'https://www.googletagmanager.com',
	'https://www.google-analytics.com',
	],
	'object-src': ['none'],
	'connect-src': [
	`'self'`,
	'http://127.0.0.1:9001', // For trace_processor_shell --httpd.
	'https://www.google-analytics.com',
	'https://*.googleapis.com', // For Google Cloud Storage fetches.
	'blob:',
	'data:',
	],
	'img-src': [
	`'self'`,
	'data:',
	'blob:',
	'https://www.google-analytics.com',
	'https://www.googletagmanager.com',
	],
	'navigate-to': ['https://*.perfetto.dev', 'self'],
	};
	const meta = document.createElement('meta');
	meta.httpEquiv = 'Content-Security-Policy';
	let policyStr = '';
	for (const [key, list] of Object.entries(policy)) {
	policyStr += `${key} ${list.join(' ')}; `;
	}
	meta.content = policyStr;
	document.head.appendChild(meta);
	}

	function main() {
	setupContentSecurityPolicy();

	// Load the css. The load is asynchronous and the CSS is not ready by the time
	// appenChild returns.
	const cssLoadPromise = defer<void>();
	const css = document.createElement('link');
	css.rel = 'stylesheet';
	css.href = globals.root + 'perfetto.css';
	css.onload = () => cssLoadPromise.resolve();
	css.onerror = (err) => cssLoadPromise.reject(err);
	const favicon = document.head.querySelector('#favicon') as HTMLLinkElement;
	if (favicon) favicon.href = globals.root + 'assets/favicon.png';

	// Load the script to detect if this is a Googler (see comments on globals.ts)
	// and initialize GA after that (or after a timeout if something goes wrong).
	const script = document.createElement('script');
	script.src =
	'https://storage.cloud.google.com/perfetto-ui-internal/is_internal_user.js';
	script.async = true;
	script.onerror = () => globals.logging.initialize();
	script.onload = () => globals.logging.initialize();
	setTimeout(() => globals.logging.initialize(), 5000);

	document.head.append(script, css);

	// Add Error handlers for JS error and for uncaught exceptions in promises.
	setErrorHandler((err: string) => maybeShowErrorDialog(err));
	window.addEventListener('error', e => reportError(e));
	window.addEventListener('unhandledrejection', e => reportError(e));

	const controller = new Worker(globals.root + 'controller_bundle.js');
	const frontendChannel = new MessageChannel();
	const controllerChannel = new MessageChannel();
	const extensionLocalChannel = new MessageChannel();
	const errorReportingChannel = new MessageChannel();

	errorReportingChannel.port2.onmessage = (e) =>
	maybeShowErrorDialog(`${e.data}`);

	controller.postMessage(
	{
	frontendPort: frontendChannel.port1,
	controllerPort: controllerChannel.port1,
	extensionPort: extensionLocalChannel.port1,
	errorReportingPort: errorReportingChannel.port1,
	},
	[
	frontendChannel.port1,
	controllerChannel.port1,
	extensionLocalChannel.port1,
	errorReportingChannel.port1,
	]);

	const dispatch =
	controllerChannel.port2.postMessage.bind(controllerChannel.port2);
	globals.initialize(dispatch, controller);
	globals.serviceWorkerController.install();

	const router = new Router(
	'/',
	{
	'/': HomePage,
	'/viewer': ViewerPage,
	'/record': RecordPage,
	'/query': AnalyzePage,
	'/metrics': MetricsPage,
	'/info': TraceInfoPage,
	},
	dispatch,
	globals.logging);
	forwardRemoteCalls(frontendChannel.port2, new FrontendApi(router));

	// We proxy messages between the extension and the controller because the
	// controller's worker can't access chrome.runtime.
	const extensionPort = window.chrome && chrome.runtime ?
	chrome.runtime.connect(EXTENSION_ID) :
	undefined;

	setExtensionAvailability(extensionPort !== undefined);

	if (extensionPort) {
	extensionPort.onDisconnect.addListener(_ => {
	setExtensionAvailability(false);
	// tslint:disable-next-line: no-unused-expression
	void chrome.runtime.lastError; // Needed to not receive an error log.
	});
	// This forwards the messages from the extension to the controller.
	extensionPort.onMessage.addListener(
	(message: object, _port: chrome.runtime.Port) => {
	extensionLocalChannel.port2.postMessage(message);
	});
	}

	// This forwards the messages from the controller to the extension
	extensionLocalChannel.port2.onmessage = ({data}) => {
	if (extensionPort) extensionPort.postMessage(data);
	};

	// Put these variables in the global scope for better debugging.
	(window as {} as {m: {}}).m = m;
	(window as {} as {globals: {}}).globals = globals;
	(window as {} as {Actions: {}}).Actions = Actions;

	// Prevent pinch zoom.
	document.body.addEventListener('wheel', (e: MouseEvent) => {
	if (e.ctrlKey) e.preventDefault();
	}, {passive: false});

	cssLoadPromise.then(() => onCssLoaded(router));
	}

	function onCssLoaded(router: Router) {
	initCssConstants();
	// Clear all the contents of the initial page (e.g. the <pre> error message)
	// And replace it with the root <main> element which will be used by mithril.
	document.body.innerHTML = '<main></main>';
	const main = assertExists(document.body.querySelector('main'));
	globals.rafScheduler.domRedraw = () =>
	m.render(main, m(router.resolve(globals.state.route)));

	router.navigateToCurrentHash();

	// /?s=xxxx for permalinks.
	const stateHash = Router.param('s');
	const urlHash = Router.param('url');
	const androidBugTool = Router.param('openFromAndroidBugTool');
	if (typeof stateHash === 'string' && stateHash) {
	globals.dispatch(Actions.loadPermalink({
	hash: stateHash,
	}));
	} else if (typeof urlHash === 'string' && urlHash) {
	if (isLocalhostTraceUrl(urlHash)) {
	const fileName = urlHash.split('/').pop() \|\| 'local_trace.pftrace';
	const request = fetch(urlHash)
	.then(response => response.blob())
	.then(blob => {
	globals.dispatch(Actions.openTraceFromFile({
	file: new File([blob], fileName),
	}));
	})
	.catch(e => alert(`Could not load local trace ${e}`));
	taskTracker.trackPromise(request, 'Downloading local trace');
	} else {
	globals.dispatch(Actions.openTraceFromUrl({
	url: urlHash,
	}));
	}
	} else if (androidBugTool) {
	// TODO(hjd): Unify updateStatus and TaskTracker
	globals.dispatch(Actions.updateStatus({
	msg: 'Loading trace from ABT extension',
	timestamp: Date.now() / 1000
	}));
	const loadInfo = loadAndroidBugToolInfo();
	taskTracker.trackPromise(loadInfo, 'Loading trace from ABT extension');
	loadInfo
	.then(info => {
	globals.dispatch(Actions.openTraceFromFile({
	file: info.file,
	}));
	})
	.catch(e => {
	console.error(e);
	});
	}

	// Add support for opening traces from postMessage().
	window.addEventListener('message', postMessageHandler, {passive: true});

	// Will update the chip on the sidebar footer that notifies that the RPC is
	// connected. Has no effect on the controller (which will repeat this check
	// before creating a new engine).
	CheckHttpRpcConnection();
	initLiveReloadIfLocalhost();

	updateAvailableAdbDevices();
	try {
	navigator.usb.addEventListener(
	'connect', () => updateAvailableAdbDevices());
	navigator.usb.addEventListener(
	'disconnect', () => updateAvailableAdbDevices());
	} catch (e) {
	console.error('WebUSB API not supported');
	}
	installFileDropHandler();
	}

	main();