Add analytics events for wasm dry runs on web builds (#171818)

Follow up to https://github.com/flutter/flutter/pull/171682
Depends on https://github.com/dart-lang/tools/pull/2125

---------

Co-authored-by: Nate Biggs <natebiggs@google.com>

packages/flutter_tools/lib/src/build_system/build_targets.dart

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+import 'package:unified_analytics/unified_analytics.dart';
+
 import '../base/file_system.dart';
 import '../web/compiler_config.dart';
 import './build_system.dart';
@@ -14,7 +16,11 @@ abstract class BuildTargets {
   Target get releaseCopyFlutterBundle;
   Target get generateLocalizationsTarget;
   Target get dartPluginRegistrantTarget;
-  Target webServiceWorker(FileSystem fileSystem, List<WebCompilerConfig> compileConfigs);
+  Target webServiceWorker(
+    FileSystem fileSystem,
+    List<WebCompilerConfig> compileConfigs,
+    Analytics analytics,
+  );
 }
 
 /// BuildTargets that return NoOpTarget for every action.
@@ -34,8 +40,11 @@ class NoOpBuildTargets extends BuildTargets {
   Target get dartPluginRegistrantTarget => const _NoOpTarget();
 
   @override
-  Target webServiceWorker(FileSystem fileSystem, List<WebCompilerConfig> compileConfigs) =>
-      const _NoOpTarget();
+  Target webServiceWorker(
+    FileSystem fileSystem,
+    List<WebCompilerConfig> compileConfigs,
+    Analytics analytics,
+  ) => const _NoOpTarget();
 }
 
 /// A [Target] that does nothing.

packages/flutter_tools/lib/src/build_system/targets/web.dart

@@ -6,6 +6,7 @@ import 'dart:math';
 
 import 'package:crypto/crypto.dart';
 import 'package:package_config/package_config.dart';
+import 'package:unified_analytics/unified_analytics.dart';
 
 import '../../artifacts.dart';
 import '../../base/file_system.dart';
@@ -273,11 +274,13 @@ class Dart2JSTarget extends Dart2WebTarget {
 
 /// Compiles a web entry point with dart2wasm.
 class Dart2WasmTarget extends Dart2WebTarget {
-  Dart2WasmTarget(this.compilerConfig);
+  Dart2WasmTarget(this.compilerConfig, this._analytics);
 
   @override
   final WasmCompilerConfig compilerConfig;
 
+  final Analytics _analytics;
+
   /// List the preconfigured build options for a given build mode.
   List<String> buildModeOptions(BuildMode mode, List<String> dartDefines) => switch (mode) {
     BuildMode.debug => <String>[
@@ -403,22 +406,28 @@ class Dart2WasmTarget extends Dart2WebTarget {
     final int exitCode = runResult.exitCode;
     final String stdout = runResult.stdout;
     final String stderr = runResult.stderr;
+    final String result;
+    String? findingsSummary;
+
     if (exitCode != 0 && exitCode != 254) {
       environment.logger.printWarning('Unexpected wasm dry run failure ($exitCode):');
       if (stderr.isNotEmpty) {
         environment.logger.printWarning(stdout);
         environment.logger.printWarning(stderr);
       }
+      result = 'crash';
     } else if (exitCode == 0) {
       environment.logger.printWarning(
         'Wasm dry run succeeded. Consider building and testing your application with the '
         '`--wasm` flag. See docs for more info: '
         'https://docs.flutter.dev/platform-integration/web/wasm',
       );
+      result = 'success';
     } else if (stderr.isNotEmpty) {
       environment.logger.printWarning('Wasm dry run failed:');
       environment.logger.printWarning(stdout);
       environment.logger.printWarning(stderr);
+      result = 'failure';
     } else if (stdout.isNotEmpty) {
       environment.logger.printWarning('Wasm dry run findings:');
       environment.logger.printWarning(stdout);
@@ -426,20 +435,30 @@ class Dart2WasmTarget extends Dart2WebTarget {
         'Consider addressing these issues to enable wasm builds. See docs for more info: '
         'https://docs.flutter.dev/platform-integration/web/wasm\n',
       );
+      result = 'findings';
+      findingsSummary = RegExp(
+        r'\(([0-9]+)\)',
+      ).allMatches(stdout).map((RegExpMatch f) => f.group(1)).join(',');
+    } else {
+      result = 'unknown';
     }
     environment.logger.printWarning('Use --no-wasm-dry-run to disable these warnings.');
+
+    _analytics.send(
+      Event.flutterWasmDryRun(result: result, exitCode: exitCode, findingsSummary: findingsSummary),
+    );
   }
 }
 
 /// Unpacks the dart2js or dart2wasm compilation and resources to a given
 /// output directory.
 class WebReleaseBundle extends Target {
-  WebReleaseBundle(List<WebCompilerConfig> configs)
+  WebReleaseBundle(List<WebCompilerConfig> configs, Analytics analytics)
     : this._(
         compileTargets: configs
             .map(
               (WebCompilerConfig config) => switch (config) {
-                WasmCompilerConfig() => Dart2WasmTarget(config),
+                WasmCompilerConfig() => Dart2WasmTarget(config, analytics),
                 JsCompilerConfig() => Dart2JSTarget(config),
               },
             )
@@ -743,17 +762,18 @@ class WebBuiltInAssets extends Target {
 
 /// Generate a service worker for a web target.
 class WebServiceWorker extends Target {
-  const WebServiceWorker(this.fileSystem, this.compileConfigs);
+  const WebServiceWorker(this.fileSystem, this.compileConfigs, this.analytics);
 
   final FileSystem fileSystem;
   final List<WebCompilerConfig> compileConfigs;
+  final Analytics analytics;
 
   @override
   String get name => 'web_service_worker';
 
   @override
   List<Target> get dependencies => <Target>[
-    WebReleaseBundle(compileConfigs),
+    WebReleaseBundle(compileConfigs, analytics),
     WebBuiltInAssets(fileSystem),
   ];
 

packages/flutter_tools/lib/src/isolated/build_targets.dart

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+import 'package:unified_analytics/unified_analytics.dart';
+
 import '../base/file_system.dart';
 import '../build_system/build_system.dart';
 import '../build_system/build_targets.dart';
@@ -27,6 +29,9 @@ class BuildTargetsImpl extends BuildTargets {
   Target get dartPluginRegistrantTarget => const DartPluginRegistrantTarget();
 
   @override
-  Target webServiceWorker(FileSystem fileSystem, List<WebCompilerConfig> compileConfigs) =>
-      WebServiceWorker(fileSystem, compileConfigs);
+  Target webServiceWorker(
+    FileSystem fileSystem,
+    List<WebCompilerConfig> compileConfigs,
+    Analytics analytics,
+  ) => WebServiceWorker(fileSystem, compileConfigs, analytics);
 }

packages/flutter_tools/lib/src/web/compile.dart

@@ -88,7 +88,7 @@ class WebBuilder {
     final Stopwatch sw = Stopwatch()..start();
     try {
       final BuildResult result = await _buildSystem.build(
-        globals.buildTargets.webServiceWorker(_fileSystem, compilerConfigs),
+        globals.buildTargets.webServiceWorker(_fileSystem, compilerConfigs, _analytics),
         Environment(
           projectDir: flutterProject.directory,
           outputDir: outputDirectory,

packages/flutter_tools/pubspec.yaml

@@ -53,7 +53,7 @@ dependencies:
   http_multi_server: 3.2.2
   convert: 3.1.2
   async: 2.13.0
-  unified_analytics: 8.0.2
+  unified_analytics: 8.0.5
   pubspec_parse: 1.5.0
 
   graphs: 2.3.2
@@ -126,4 +126,4 @@ dev_dependencies:
 dartdoc:
   # Exclude this package from the hosted API docs.
   nodoc: true
-# PUBSPEC CHECKSUM: 36e76b
+# PUBSPEC CHECKSUM: kr614i

packages/flutter_tools/test/general.shard/build_system/targets/web_test.dart

@@ -17,6 +17,7 @@ import 'package:flutter_tools/src/isolated/mustache_template.dart';
 import 'package:flutter_tools/src/web/compile.dart';
 import 'package:flutter_tools/src/web/file_generators/flutter_service_worker_js.dart';
 import 'package:flutter_tools/src/web_template.dart';
+import 'package:unified_analytics/unified_analytics.dart';
 
 import '../../../src/common.dart';
 import '../../../src/fake_process_manager.dart';
@@ -133,7 +134,9 @@ name: foo
       final Directory webResources = environment.projectDir.childDirectory('web');
       webResources.childFile('index.html').createSync(recursive: true);
       environment.buildDir.childFile('main.dart.js').createSync();
-      await WebReleaseBundle(<WebCompilerConfig>[const JsCompilerConfig()]).build(environment);
+      await WebReleaseBundle(<WebCompilerConfig>[
+        const JsCompilerConfig(),
+      ], const NoOpAnalytics()).build(environment);
 
       expect(environment.outputDir.childFile('version.json'), exists);
     }),
@@ -148,7 +151,9 @@ name: foo
       final Directory webResources = environment.projectDir.childDirectory('web');
       webResources.childFile('index.html').createSync(recursive: true);
       environment.buildDir.childFile('main.dart.js').createSync();
-      await WebReleaseBundle(<WebCompilerConfig>[const JsCompilerConfig()]).build(environment);
+      await WebReleaseBundle(<WebCompilerConfig>[
+        const JsCompilerConfig(),
+      ], const NoOpAnalytics()).build(environment);
 
       final String versionFile = environment.outputDir.childFile('version.json').readAsStringSync();
       expect(versionFile, contains('"version":"2.0.0"'));
@@ -265,7 +270,7 @@ name: foo
 
       await WebReleaseBundle(<WebCompilerConfig>[
         const JsCompilerConfig(dumpInfo: true),
-      ]).build(environment);
+      ], const NoOpAnalytics()).build(environment);
 
       expect(environment.outputDir.childFile('foo.txt').readAsStringSync(), 'A');
       expect(environment.outputDir.childFile('main.dart.js').existsSync(), true);
@@ -284,7 +289,9 @@ name: foo
       // Update to arbitrary resource file triggers rebuild.
       webResources.childFile('foo.txt').writeAsStringSync('B');
 
-      await WebReleaseBundle(<WebCompilerConfig>[const JsCompilerConfig()]).build(environment);
+      await WebReleaseBundle(<WebCompilerConfig>[
+        const JsCompilerConfig(),
+      ], const NoOpAnalytics()).build(environment);
 
       expect(environment.outputDir.childFile('foo.txt').readAsStringSync(), 'B');
     }),
@@ -304,7 +311,9 @@ name: foo
       environment.buildDir.childFile('main.dart.mjs')
         ..createSync()
         ..writeAsStringSync('old mjs');
-      await WebReleaseBundle(<WebCompilerConfig>[const WasmCompilerConfig()]).build(environment);
+      await WebReleaseBundle(<WebCompilerConfig>[
+        const WasmCompilerConfig(),
+      ], const NoOpAnalytics()).build(environment);
       expect(environment.outputDir.childFile('main.dart.wasm').readAsStringSync(), 'old wasm');
       expect(environment.outputDir.childFile('main.dart.mjs').readAsStringSync(), 'old mjs');
 
@@ -315,7 +324,9 @@ name: foo
         ..createSync()
         ..writeAsStringSync('new mjs');
 
-      await WebReleaseBundle(<WebCompilerConfig>[const WasmCompilerConfig()]).build(environment);
+      await WebReleaseBundle(<WebCompilerConfig>[
+        const WasmCompilerConfig(),
+      ], const NoOpAnalytics()).build(environment);
 
       expect(environment.outputDir.childFile('main.dart.wasm').readAsStringSync(), 'new wasm');
       expect(environment.outputDir.childFile('main.dart.mjs').readAsStringSync(), 'new mjs');
@@ -1198,6 +1209,7 @@ name: foo
                         sourceMaps: sourceMaps,
                         minify: minify,
                       ),
+                      const NoOpAnalytics(),
                     ).build(environment);
 
                     expect(outputJsFile.existsSync(), isTrue);
@@ -1267,7 +1279,7 @@ name: foo
     ];
 
     final Iterable<String> buildKeys = testConfigs.map((WasmCompilerConfig config) {
-      final Dart2WasmTarget target = Dart2WasmTarget(config);
+      final Dart2WasmTarget target = Dart2WasmTarget(config, const NoOpAnalytics());
       return target.buildKey;
     });
 
@@ -1404,7 +1416,7 @@ name: foo
         ..writeAsStringSync('A');
       await WebServiceWorker(globals.fs, <WebCompilerConfig>[
         const JsCompilerConfig(),
-      ]).build(environment);
+      ], const NoOpAnalytics()).build(environment);
 
       expect(environment.outputDir.childFile('flutter_service_worker.js'), exists);
       // Contains file hash.
@@ -1435,7 +1447,7 @@ name: foo
         ..writeAsStringSync('A');
       await WebServiceWorker(globals.fs, <WebCompilerConfig>[
         const JsCompilerConfig(),
-      ]).build(environment);
+      ], const NoOpAnalytics()).build(environment);
 
       expect(environment.outputDir.childFile('flutter_service_worker.js'), exists);
       // Contains the same file hash for both `/` and the root index.html file.
@@ -1464,7 +1476,7 @@ name: foo
       environment.outputDir.childFile('main.dart.js.map').createSync(recursive: true);
       await WebServiceWorker(globals.fs, <WebCompilerConfig>[
         const JsCompilerConfig(),
-      ]).build(environment);
+      ], const NoOpAnalytics()).build(environment);
 
       // No caching of source maps.
       expect(