packages/devtools_app/lib/src/analytics/analytics.dart - external/github.com/flutter/devtools - Git at Google

 // Copyright 2019 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 @JS()
 library gtags;

 // ignore_for_file: non_constant_identifier_names

 import 'dart:async';
 import 'dart:html';

 import 'package:flutter/foundation.dart';
 import 'package:js/js.dart';
 import 'package:js/js_util.dart';

 import '../../devtools.dart' as devtools show version;
 import '../app.dart';
 import '../config_specific/logger/logger.dart';
 import '../config_specific/server/server.dart' as server;
 import '../config_specific/url/url.dart';
 import '../globals.dart';
 import '../ui/gtags.dart';
 import '../version.dart';
 import 'constants.dart';

 // Dimensions1 AppType values:
 const String appTypeFlutter = 'flutter';
 const String appTypeWeb = 'web';
 // Dimensions2 BuildType values:
 const String buildTypeDebug = 'debug';
 const String buildTypeProfile = 'profile';
 // Dimensions3 PlatformType values:
 //    android
 //    linux
 //    ios
 //    macos
 //    windows
 //    fuchsia
 //    unknown     VM Service before version 3.24
 // Dimension4 devToolsPlatformType values:
 const String devToolsPlatformTypeMac = 'MacIntel';
 const String devToolsPlatformTypeLinux = 'Linux';
 const String devToolsPlatformTypeWindows = 'Windows';
 // Start with Android_n.n.n
 const String devToolsPlatformTypeAndroid = 'Android_';
 // Dimension5 devToolsChrome starts with
 const String devToolsChromeName = 'Chrome/'; // starts with and ends with n.n.n
 const String devToolsChromeIos = 'Crios/'; // starts with and ends with n.n.n
 const String devToolsChromeOS = 'CrOS'; // Chrome OS
 // Dimension6 devToolsVersion

 // Dimension7 ideLaunched
 const String ideLaunchedQuery = 'ide'; // '&ide=' query parameter
 const String ideLaunchedCLI = 'CLI'; // Command Line Interface

 @JS('gtagsEnabled')
 external bool Function() get _isGtagsEnabled;

 bool isGtagsEnabled() => _isGtagsEnabled?.call() ?? false;

 /// Is the query parameter &gtags= set to reset?
 @JS('gtagsReset')
 external bool isGtagsReset();

 @JS('initializeGA')
 external void initializeGA();

 @JS()
 @anonymous
 class GtagEventDevTools extends GtagEvent {
   external factory GtagEventDevTools({
     String event_category,
     String event_label, // Event e.g., gaScreenViewEvent, gaSelectEvent, etc.
     String send_to, // UA ID of target GA property to receive event data.

     int value,
     bool non_interaction,
     dynamic custom_map,
     String user_app, // dimension1 (flutter or web)
     String user_build, // dimension2 (debug or profile)
     String user_platform, // dimension3 (android/ios/fuchsia/linux/mac/windows)
     String devtools_platform, // dimension4 linux/android/mac/windows
     String devtools_chrome, // dimension5 Chrome version #
     String devtools_version, // dimension6 DevTools version #
     String ide_launched, // dimension7 Devtools launched (CLI, VSCode, Android)
     String flutter_client_id, // dimension8 Flutter tool client_id (~/.flutter).

     int raster_duration,
     int ui_duration,
   });

   @override
   external String get event_category;

   @override
   external String get event_label;

   @override
   external String get send_to;

   @override
   external int get value; // Positive number.

   @override
   external bool get non_interaction;

   @override
   external dynamic get custom_map;

   // Custom dimensions:
   external String get user_app;

   external String get user_build;

   external String get user_platform;

   external String get devtools_platform;

   external String get devtools_chrome;

   external String get devtools_version;

   external String get ide_launched;

   external String get flutter_client_id;

   // Custom metrics:
   external int get raster_duration;

   external int get ui_duration;
 }

 @JS()
 @anonymous
 class GtagExceptionDevTools extends GtagException {
   external factory GtagExceptionDevTools({
     String description,
     bool fatal,
     String user_app, // dimension1 (flutter or web)
     String user_build, // dimension2 (debug or profile)
     String user_platform, // dimension3 (android or ios)
     String devtools_platform, // dimension4 linux/android/mac/windows
     String devtools_chrome, // dimension5 Chrome version #
     String devtools_version, // dimension6 DevTools version #
     String ide_launched, // dimension7 IDE launched DevTools
     String flutter_client_id, // dimension8 Flutter tool clientId
   });

   @override
   external String get description; // Description of the error.
   @override
   external bool get fatal; // Fatal error.

   // Custom dimensions:
   external String get user_app;

   external String get user_build;

   external String get user_platform;

   external String get devtools_platform;

   external String get devtools_chrome;

   external String get devtools_version;

   external String get ide_launched;

   external String get flutter_client_id;
 }

 ValueNotifier<bool> _gaEnabledNotifier = ValueNotifier(false);

 ValueListenable<bool> get gaEnabledNotifier => _gaEnabledNotifier;

 // Exposed function to JS via allowInterop.
 bool gaEnabled() => _gaEnabledNotifier.value;

 /// Request DevTools property value 'enabled' (GA enabled) stored in the file
 /// '~\.devtools'.
 Future<bool> isAnalyticsEnabled() async {
   _gaEnabledNotifier.value = await server.isAnalyticsEnabled();
   return _gaEnabledNotifier.value;
 }

 /// Set the DevTools property 'enabled' (GA enabled) stored in the file
 /// '~/.devtools'.
 Future<void> setAnalyticsEnabled([bool value = true]) async {
   final didSet = await server.setAnalyticsEnabled(value);
   if (didSet) {
     _gaEnabledNotifier.value = value;
   }
 }

 void screen(
   String screenName, [
   int value = 0,
 ]) {
   GTag.event(
     screenName,
     GtagEventDevTools(
       event_category: screenViewEvent,
       value: value,
       user_app: userAppType,
       user_build: userBuildType,
       user_platform: userPlatformType,
       devtools_platform: devtoolsPlatformType,
       devtools_chrome: devtoolsChrome,
       devtools_version: devtoolsVersion,
       ide_launched: ideLaunched,
       flutter_client_id: flutterClientId,
     ),
   );
 }

 void select(
   String screenName,
   String selectedItem, [
   int value = 0,
 ]) {
   GTag.event(
     screenName,
     GtagEventDevTools(
       event_category: selectEvent,
       event_label: selectedItem,
       value: value,
       user_app: userAppType,
       user_build: userBuildType,
       user_platform: userPlatformType,
       devtools_platform: devtoolsPlatformType,
       devtools_chrome: devtoolsChrome,
       devtools_version: devtoolsVersion,
       ide_launched: ideLaunched,
       flutter_client_id: flutterClientId,
     ),
   );
 }

 // Used only for Timeline Frame selection.
 void selectFrame(
   String screenName,
   String selectedItem, [
   int rasterDuration, // Custom metric
   int uiDuration, // Custom metric
 ]) {
   GTag.event(
     screenName,
     GtagEventDevTools(
       event_category: selectEvent,
       event_label: selectedItem,
       raster_duration: rasterDuration,
       ui_duration: uiDuration,
       user_app: userAppType,
       user_build: userBuildType,
       user_platform: userPlatformType,
       devtools_platform: devtoolsPlatformType,
       devtools_chrome: devtoolsChrome,
       devtools_version: devtoolsVersion,
       ide_launched: ideLaunched,
       flutter_client_id: flutterClientId,
     ),
   );
 }

 String _lastGaError;

 void error(
   String errorMessage,
   bool fatal,
 ) {
   // Don't keep recording same last error.
   if (_lastGaError == errorMessage) return;
   _lastGaError = errorMessage;

   GTag.exception(
     GtagExceptionDevTools(
       description: errorMessage,
       fatal: fatal,
       user_app: userAppType,
       user_build: userBuildType,
       user_platform: userPlatformType,
       devtools_platform: devtoolsPlatformType,
       devtools_chrome: devtoolsChrome,
       devtools_version: devtoolsVersion,
       ide_launched: ideLaunched,
       flutter_client_id: flutterClientId,
     ),
   );
 }

 ////////////////////////////////////////////////////////////////////////////////
 // Utilities to collect all platform and DevTools state for Analytics.
 ////////////////////////////////////////////////////////////////////////////////

 // GA dimensions:
 String _userAppType = ''; // dimension1
 String _userBuildType = ''; // dimension2
 String _userPlatformType = ''; // dimension3

 String _devtoolsPlatformType =
     ''; // dimension4 MacIntel/Linux/Windows/Android_n
 String _devtoolsChrome = ''; // dimension5 Chrome/n.n.n  or Crios/n.n.n

 const String devtoolsVersion = devtools.version; //dimension6 n.n.n

 String _ideLaunched = ''; // dimension7 IDE launched DevTools (VSCode, CLI, ...)

 String _flutterClientId = ''; // dimension8 Flutter tool clientId.

 String get userAppType => _userAppType;

 set userAppType(String __userAppType) {
   _userAppType = __userAppType;
 }

 String get userBuildType => _userBuildType;

 set userBuildType(String __userBuildType) {
   _userBuildType = __userBuildType;
 }

 String get userPlatformType => _userPlatformType;

 set userPlatformType(String __userPlatformType) {
   _userPlatformType = __userPlatformType;
 }

 String get devtoolsPlatformType => _devtoolsPlatformType;

 set devtoolsPlatformType(String __devtoolsPlatformType) {
   _devtoolsPlatformType = __devtoolsPlatformType;
 }

 String get devtoolsChrome => _devtoolsChrome;

 set devtoolsChrome(String __devtoolsChrome) {
   _devtoolsChrome = __devtoolsChrome;
 }

 String get ideLaunched => _ideLaunched;

 set ideLaunched(String __ideLaunched) {
   _ideLaunched = __ideLaunched;
 }

 String get flutterClientId => _flutterClientId;

 set flutterClientId(String __flutterClientId) {
   _flutterClientId = __flutterClientId;
 }

 bool _computingDimensions = false;
 bool _analyticsComputed = false;

 bool _computingUserApplicationDimensions = false;
 bool _userApplicationDimensionsComputed = false;

 // Computes the running application.
 Future<void> computeUserApplicationCustomGTagData() async {
   if (_userApplicationDimensionsComputed) return;

   assert(serviceManager.connectedApp.isFlutterAppNow != null);
   assert(serviceManager.connectedApp.isDartWebAppNow != null);
   assert(serviceManager.connectedApp.isProfileBuildNow != null);

   if (serviceManager.connectedApp.isFlutterAppNow) {
     userPlatformType = (await serviceManager.service.isProtocolVersionSupported(
             supportedVersion: SemanticVersion(major: 3, minor: 24)))
         ? serviceManager.vm.operatingSystem
         : 'unknown';
   }

   if (serviceManager.connectedApp.isFlutterAppNow) {
     userAppType = appTypeFlutter;
   }
   if (serviceManager.connectedApp.isDartWebAppNow) {
     userAppType = appTypeWeb;
   }
   userBuildType = serviceManager.connectedApp.isProfileBuildNow
       ? buildTypeProfile
       : buildTypeDebug;

   _analyticsComputed = true;
 }

 void exposeGaDevToolsEnabledToJs() {
   setProperty(window, 'gaDevToolsEnabled', allowInterop(gaEnabled));
 }

 @JS('getDevToolsPropertyID')
 external String devToolsProperty();

 @JS('hookupListenerForGA')
 external void jsHookupListenerForGA();

 Future<bool> get isAnalyticsAllowed async => await isAnalyticsEnabled();

 void setAllowAnalytics() {
   setAnalyticsEnabled();
 }

 void setDontAllowAnalytics() {
   setAnalyticsEnabled(false);
 }

 /// Computes the DevTools application. Fills in the devtoolsPlatformType and
 /// devtoolsChrome.
 void computeDevToolsCustomGTagsData() {
   // Platform
   final String platform = window.navigator.platform;
   platform.replaceAll(' ', '_');
   devtoolsPlatformType = platform;

   final String appVersion = window.navigator.appVersion;
   final List<String> splits = appVersion.split(' ');
   final len = splits.length;
   for (int index = 0; index < len; index++) {
     final String value = splits[index];
     // Chrome or Chrome iOS
     if (value.startsWith(devToolsChromeName) ||
         value.startsWith(devToolsChromeIos)) {
       devtoolsChrome = value;
     } else if (value.startsWith('Android')) {
       // appVersion for Android is 'Android n.n.n'
       devtoolsPlatformType = '$devToolsPlatformTypeAndroid${splits[index + 1]}';
     } else if (value == devToolsChromeOS) {
       // Chrome OS will return a platform e.g., CrOS_Linux_x86_64
       devtoolsPlatformType = '${devToolsChromeOS}_$platform';
     }
   }
 }

 // Look at the query parameters '&ide=' and record in GA.
 void computeDevToolsQueryParams() {
   ideLaunched = ideLaunchedCLI; // Default is Command Line launch.

   final queryParameters = loadQueryParams();
   final ideValue = queryParameters[ideLaunchedQuery];
   if (ideValue != null) {
     ideLaunched = ideValue;
   }
 }

 void computeFlutterClientId() async {
   flutterClientId = await server.flutterGAClientID();
 }

 int _stillWaiting = 0;
 void waitForDimensionsComputed(String screenName) {
   Timer(const Duration(milliseconds: 100), () async {
     if (_analyticsComputed) {
       screen(screenName);
     } else {
       if (_stillWaiting++ < 50) {
         waitForDimensionsComputed(screenName);
       } else {
         log('Cancel waiting for dimensions.', LogLevel.warning);
       }
     }
   });
 }

 // Loading screen from a hash code, can't collect GA (if enabled) until we have
 // all the dimension data.
 void setupAndGaScreen(String screenName) async {
   if (isGtagsEnabled()) {
     if (!_analyticsComputed) {
       _stillWaiting++;
       waitForDimensionsComputed(screenName);
     } else {
       screen(screenName);
     }
   }
 }

 void setupDimensions() {
   if (isGtagsEnabled() && !_analyticsComputed && !_computingDimensions) {
     _computingDimensions = true;
     computeDevToolsCustomGTagsData();
     computeDevToolsQueryParams();
     computeFlutterClientId();
     _analyticsComputed = true;
   }
 }

 Future<void> setupUserApplicationDimensions() async {
   if (serviceManager.connectedApp != null &&
       !_userApplicationDimensionsComputed &&
       !_computingUserApplicationDimensions) {
     _computingUserApplicationDimensions = true;
     await computeUserApplicationCustomGTagData();
     _userApplicationDimensionsComputed = true;
   }
 }

 Map<String, dynamic> generateSurveyQueryParameters() {
   const clientIdKey = 'ClientId';
   const ideKey = 'IDE';
   const fromKey = 'From';
   const internalKey = 'Internal';

   // TODO(https://github.com/flutter/devtools/issues/2475): fix url structure
   // Parsing the url via Uri.parse returns an incorrect value for fragment.
   // Grab the fragment value manually. The url will be of the form
   // http://127.0.0.1:9100/#/timeline?ide=IntelliJ-IDEA&uri=..., and we want the
   // part equal to '/timeline'.
   final url = window.location.toString();
   const fromValuePrefix = '#/';
   final startIndex = url.indexOf(fromValuePrefix);
   final endIndex = url.indexOf('?');
   final fromPage = url.substring(
     startIndex + fromValuePrefix.length,
     endIndex,
   );

   final clientId = flutterClientId;
   final internalValue = (!isExternalBuild).toString();

   return {
     clientIdKey: clientId,
     ideKey: ideLaunched,
     fromKey: fromPage,
     internalKey: internalValue,
   };
 }
	// Copyright 2019 The Chromium Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	@JS()
	library gtags;

	// ignore_for_file: non_constant_identifier_names

	import 'dart:async';
	import 'dart:html';

	import 'package:flutter/foundation.dart';
	import 'package:js/js.dart';
	import 'package:js/js_util.dart';

	import '../../devtools.dart' as devtools show version;
	import '../app.dart';
	import '../config_specific/logger/logger.dart';
	import '../config_specific/server/server.dart' as server;
	import '../config_specific/url/url.dart';
	import '../globals.dart';
	import '../ui/gtags.dart';
	import '../version.dart';
	import 'constants.dart';

	// Dimensions1 AppType values:
	const String appTypeFlutter = 'flutter';
	const String appTypeWeb = 'web';
	// Dimensions2 BuildType values:
	const String buildTypeDebug = 'debug';
	const String buildTypeProfile = 'profile';
	// Dimensions3 PlatformType values:
	// android
	// linux
	// ios
	// macos
	// windows
	// fuchsia
	// unknown VM Service before version 3.24
	// Dimension4 devToolsPlatformType values:
	const String devToolsPlatformTypeMac = 'MacIntel';
	const String devToolsPlatformTypeLinux = 'Linux';
	const String devToolsPlatformTypeWindows = 'Windows';
	// Start with Android_n.n.n
	const String devToolsPlatformTypeAndroid = 'Android_';
	// Dimension5 devToolsChrome starts with
	const String devToolsChromeName = 'Chrome/'; // starts with and ends with n.n.n
	const String devToolsChromeIos = 'Crios/'; // starts with and ends with n.n.n
	const String devToolsChromeOS = 'CrOS'; // Chrome OS
	// Dimension6 devToolsVersion

	// Dimension7 ideLaunched
	const String ideLaunchedQuery = 'ide'; // '&ide=' query parameter
	const String ideLaunchedCLI = 'CLI'; // Command Line Interface

	@JS('gtagsEnabled')
	external bool Function() get _isGtagsEnabled;

	bool isGtagsEnabled() => _isGtagsEnabled?.call() ?? false;

	/// Is the query parameter &gtags= set to reset?
	@JS('gtagsReset')
	external bool isGtagsReset();

	@JS('initializeGA')
	external void initializeGA();

	@JS()
	@anonymous
	class GtagEventDevTools extends GtagEvent {
	external factory GtagEventDevTools({
	String event_category,
	String event_label, // Event e.g., gaScreenViewEvent, gaSelectEvent, etc.
	String send_to, // UA ID of target GA property to receive event data.

	int value,
	bool non_interaction,
	dynamic custom_map,
	String user_app, // dimension1 (flutter or web)
	String user_build, // dimension2 (debug or profile)
	String user_platform, // dimension3 (android/ios/fuchsia/linux/mac/windows)
	String devtools_platform, // dimension4 linux/android/mac/windows
	String devtools_chrome, // dimension5 Chrome version #
	String devtools_version, // dimension6 DevTools version #
	String ide_launched, // dimension7 Devtools launched (CLI, VSCode, Android)
	String flutter_client_id, // dimension8 Flutter tool client_id (~/.flutter).

	int raster_duration,
	int ui_duration,
	});

	@override
	external String get event_category;

	@override
	external String get event_label;

	@override
	external String get send_to;

	@override
	external int get value; // Positive number.

	@override
	external bool get non_interaction;

	@override
	external dynamic get custom_map;

	// Custom dimensions:
	external String get user_app;

	external String get user_build;

	external String get user_platform;

	external String get devtools_platform;

	external String get devtools_chrome;

	external String get devtools_version;

	external String get ide_launched;

	external String get flutter_client_id;

	// Custom metrics:
	external int get raster_duration;

	external int get ui_duration;
	}

	@JS()
	@anonymous
	class GtagExceptionDevTools extends GtagException {
	external factory GtagExceptionDevTools({
	String description,
	bool fatal,
	String user_app, // dimension1 (flutter or web)
	String user_build, // dimension2 (debug or profile)
	String user_platform, // dimension3 (android or ios)
	String devtools_platform, // dimension4 linux/android/mac/windows
	String devtools_chrome, // dimension5 Chrome version #
	String devtools_version, // dimension6 DevTools version #
	String ide_launched, // dimension7 IDE launched DevTools
	String flutter_client_id, // dimension8 Flutter tool clientId
	});

	@override
	external String get description; // Description of the error.
	@override
	external bool get fatal; // Fatal error.

	// Custom dimensions:
	external String get user_app;

	external String get user_build;

	external String get user_platform;

	external String get devtools_platform;

	external String get devtools_chrome;

	external String get devtools_version;

	external String get ide_launched;

	external String get flutter_client_id;
	}

	ValueNotifier<bool> _gaEnabledNotifier = ValueNotifier(false);

	ValueListenable<bool> get gaEnabledNotifier => _gaEnabledNotifier;

	// Exposed function to JS via allowInterop.
	bool gaEnabled() => _gaEnabledNotifier.value;

	/// Request DevTools property value 'enabled' (GA enabled) stored in the file
	/// '~\.devtools'.
	Future<bool> isAnalyticsEnabled() async {
	_gaEnabledNotifier.value = await server.isAnalyticsEnabled();
	return _gaEnabledNotifier.value;
	}

	/// Set the DevTools property 'enabled' (GA enabled) stored in the file
	/// '~/.devtools'.
	Future<void> setAnalyticsEnabled([bool value = true]) async {
	final didSet = await server.setAnalyticsEnabled(value);
	if (didSet) {
	_gaEnabledNotifier.value = value;
	}
	}

	void screen(
	String screenName, [
	int value = 0,
	]) {
	GTag.event(
	screenName,
	GtagEventDevTools(
	event_category: screenViewEvent,
	value: value,
	user_app: userAppType,
	user_build: userBuildType,
	user_platform: userPlatformType,
	devtools_platform: devtoolsPlatformType,
	devtools_chrome: devtoolsChrome,
	devtools_version: devtoolsVersion,
	ide_launched: ideLaunched,
	flutter_client_id: flutterClientId,
	),
	);
	}

	void select(
	String screenName,
	String selectedItem, [
	int value = 0,
	]) {
	GTag.event(
	screenName,
	GtagEventDevTools(
	event_category: selectEvent,
	event_label: selectedItem,
	value: value,
	user_app: userAppType,
	user_build: userBuildType,
	user_platform: userPlatformType,
	devtools_platform: devtoolsPlatformType,
	devtools_chrome: devtoolsChrome,
	devtools_version: devtoolsVersion,
	ide_launched: ideLaunched,
	flutter_client_id: flutterClientId,
	),
	);
	}

	// Used only for Timeline Frame selection.
	void selectFrame(
	String screenName,
	String selectedItem, [
	int rasterDuration, // Custom metric
	int uiDuration, // Custom metric
	]) {
	GTag.event(
	screenName,
	GtagEventDevTools(
	event_category: selectEvent,
	event_label: selectedItem,
	raster_duration: rasterDuration,
	ui_duration: uiDuration,
	user_app: userAppType,
	user_build: userBuildType,
	user_platform: userPlatformType,
	devtools_platform: devtoolsPlatformType,
	devtools_chrome: devtoolsChrome,
	devtools_version: devtoolsVersion,
	ide_launched: ideLaunched,
	flutter_client_id: flutterClientId,
	),
	);
	}

	String _lastGaError;

	void error(
	String errorMessage,
	bool fatal,
	) {
	// Don't keep recording same last error.
	if (_lastGaError == errorMessage) return;
	_lastGaError = errorMessage;

	GTag.exception(
	GtagExceptionDevTools(
	description: errorMessage,
	fatal: fatal,
	user_app: userAppType,
	user_build: userBuildType,
	user_platform: userPlatformType,
	devtools_platform: devtoolsPlatformType,
	devtools_chrome: devtoolsChrome,
	devtools_version: devtoolsVersion,
	ide_launched: ideLaunched,
	flutter_client_id: flutterClientId,
	),
	);
	}

	////////////////////////////////////////////////////////////////////////////////
	// Utilities to collect all platform and DevTools state for Analytics.
	////////////////////////////////////////////////////////////////////////////////

	// GA dimensions:
	String _userAppType = ''; // dimension1
	String _userBuildType = ''; // dimension2
	String _userPlatformType = ''; // dimension3

	String _devtoolsPlatformType =
	''; // dimension4 MacIntel/Linux/Windows/Android_n
	String _devtoolsChrome = ''; // dimension5 Chrome/n.n.n or Crios/n.n.n

	const String devtoolsVersion = devtools.version; //dimension6 n.n.n

	String _ideLaunched = ''; // dimension7 IDE launched DevTools (VSCode, CLI, ...)

	String _flutterClientId = ''; // dimension8 Flutter tool clientId.

	String get userAppType => _userAppType;

	set userAppType(String __userAppType) {
	_userAppType = __userAppType;
	}

	String get userBuildType => _userBuildType;

	set userBuildType(String __userBuildType) {
	_userBuildType = __userBuildType;
	}

	String get userPlatformType => _userPlatformType;

	set userPlatformType(String __userPlatformType) {
	_userPlatformType = __userPlatformType;
	}

	String get devtoolsPlatformType => _devtoolsPlatformType;

	set devtoolsPlatformType(String __devtoolsPlatformType) {
	_devtoolsPlatformType = __devtoolsPlatformType;
	}

	String get devtoolsChrome => _devtoolsChrome;

	set devtoolsChrome(String __devtoolsChrome) {
	_devtoolsChrome = __devtoolsChrome;
	}

	String get ideLaunched => _ideLaunched;

	set ideLaunched(String __ideLaunched) {
	_ideLaunched = __ideLaunched;
	}

	String get flutterClientId => _flutterClientId;

	set flutterClientId(String __flutterClientId) {
	_flutterClientId = __flutterClientId;
	}

	bool _computingDimensions = false;
	bool _analyticsComputed = false;

	bool _computingUserApplicationDimensions = false;
	bool _userApplicationDimensionsComputed = false;

	// Computes the running application.
	Future<void> computeUserApplicationCustomGTagData() async {
	if (_userApplicationDimensionsComputed) return;

	assert(serviceManager.connectedApp.isFlutterAppNow != null);
	assert(serviceManager.connectedApp.isDartWebAppNow != null);
	assert(serviceManager.connectedApp.isProfileBuildNow != null);

	if (serviceManager.connectedApp.isFlutterAppNow) {
	userPlatformType = (await serviceManager.service.isProtocolVersionSupported(
	supportedVersion: SemanticVersion(major: 3, minor: 24)))
	? serviceManager.vm.operatingSystem
	: 'unknown';
	}

	if (serviceManager.connectedApp.isFlutterAppNow) {
	userAppType = appTypeFlutter;
	}
	if (serviceManager.connectedApp.isDartWebAppNow) {
	userAppType = appTypeWeb;
	}
	userBuildType = serviceManager.connectedApp.isProfileBuildNow
	? buildTypeProfile
	: buildTypeDebug;

	_analyticsComputed = true;
	}

	void exposeGaDevToolsEnabledToJs() {
	setProperty(window, 'gaDevToolsEnabled', allowInterop(gaEnabled));
	}

	@JS('getDevToolsPropertyID')
	external String devToolsProperty();

	@JS('hookupListenerForGA')
	external void jsHookupListenerForGA();

	Future<bool> get isAnalyticsAllowed async => await isAnalyticsEnabled();

	void setAllowAnalytics() {
	setAnalyticsEnabled();
	}

	void setDontAllowAnalytics() {
	setAnalyticsEnabled(false);
	}

	/// Computes the DevTools application. Fills in the devtoolsPlatformType and
	/// devtoolsChrome.
	void computeDevToolsCustomGTagsData() {
	// Platform
	final String platform = window.navigator.platform;
	platform.replaceAll(' ', '_');
	devtoolsPlatformType = platform;

	final String appVersion = window.navigator.appVersion;
	final List<String> splits = appVersion.split(' ');
	final len = splits.length;
	for (int index = 0; index < len; index++) {
	final String value = splits[index];
	// Chrome or Chrome iOS
	if (value.startsWith(devToolsChromeName) \|\|
	value.startsWith(devToolsChromeIos)) {
	devtoolsChrome = value;
	} else if (value.startsWith('Android')) {
	// appVersion for Android is 'Android n.n.n'
	devtoolsPlatformType = '$devToolsPlatformTypeAndroid${splits[index + 1]}';
	} else if (value == devToolsChromeOS) {
	// Chrome OS will return a platform e.g., CrOS_Linux_x86_64
	devtoolsPlatformType = '${devToolsChromeOS}_$platform';
	}
	}
	}

	// Look at the query parameters '&ide=' and record in GA.
	void computeDevToolsQueryParams() {
	ideLaunched = ideLaunchedCLI; // Default is Command Line launch.

	final queryParameters = loadQueryParams();
	final ideValue = queryParameters[ideLaunchedQuery];
	if (ideValue != null) {
	ideLaunched = ideValue;
	}
	}

	void computeFlutterClientId() async {
	flutterClientId = await server.flutterGAClientID();
	}

	int _stillWaiting = 0;
	void waitForDimensionsComputed(String screenName) {
	Timer(const Duration(milliseconds: 100), () async {
	if (_analyticsComputed) {
	screen(screenName);
	} else {
	if (_stillWaiting++ < 50) {
	waitForDimensionsComputed(screenName);
	} else {
	log('Cancel waiting for dimensions.', LogLevel.warning);
	}
	}
	});
	}

	// Loading screen from a hash code, can't collect GA (if enabled) until we have
	// all the dimension data.
	void setupAndGaScreen(String screenName) async {
	if (isGtagsEnabled()) {
	if (!_analyticsComputed) {
	_stillWaiting++;
	waitForDimensionsComputed(screenName);
	} else {
	screen(screenName);
	}
	}
	}

	void setupDimensions() {
	if (isGtagsEnabled() && !_analyticsComputed && !_computingDimensions) {
	_computingDimensions = true;
	computeDevToolsCustomGTagsData();
	computeDevToolsQueryParams();
	computeFlutterClientId();
	_analyticsComputed = true;
	}
	}

	Future<void> setupUserApplicationDimensions() async {
	if (serviceManager.connectedApp != null &&
	!_userApplicationDimensionsComputed &&
	!_computingUserApplicationDimensions) {
	_computingUserApplicationDimensions = true;
	await computeUserApplicationCustomGTagData();
	_userApplicationDimensionsComputed = true;
	}
	}

	Map<String, dynamic> generateSurveyQueryParameters() {
	const clientIdKey = 'ClientId';
	const ideKey = 'IDE';
	const fromKey = 'From';
	const internalKey = 'Internal';

	// TODO(https://github.com/flutter/devtools/issues/2475): fix url structure
	// Parsing the url via Uri.parse returns an incorrect value for fragment.
	// Grab the fragment value manually. The url will be of the form
	// http://127.0.0.1:9100/#/timeline?ide=IntelliJ-IDEA&uri=..., and we want the
	// part equal to '/timeline'.
	final url = window.location.toString();
	const fromValuePrefix = '#/';
	final startIndex = url.indexOf(fromValuePrefix);
	final endIndex = url.indexOf('?');
	final fromPage = url.substring(
	startIndex + fromValuePrefix.length,
	endIndex,
	);

	final clientId = flutterClientId;
	final internalValue = (!isExternalBuild).toString();

	return {
	clientIdKey: clientId,
	ideKey: ideLaunched,
	fromKey: fromPage,
	internalKey: internalValue,
	};
	}