Rename AppRunLogger, stop writing status messages that break JSON (#172591)

Closes https://github.com/flutter/flutter/issues/118907.

It looks like some of the work around splitting had already happened
(`DaemonLogger`), so this ... seems right?

packages/flutter_tools/lib/executable.dart

@@ -323,7 +323,7 @@ class LoggerFactory {
       return NotifyingLogger(verbose: verbose, parent: logger);
     }
     if (machine) {
-      return AppRunLogger(parent: logger);
+      return MachineOutputLogger(parent: logger);
     }
     return logger;
   }

packages/flutter_tools/lib/src/base/logger.dart

@@ -219,9 +219,6 @@ abstract class Logger {
   });
 
   /// Send an event to be emitted.
-  ///
-  /// Only surfaces a value in machine modes, Loggers may ignore this message in
-  /// non-machine modes.
   void sendEvent(String name, [Map<String, dynamic>? args]) {}
 
   /// Clears all output.

packages/flutter_tools/lib/src/commands/attach.dart

@@ -378,7 +378,7 @@ known, it can be explicitly provided to attach via the command-line, e.g.
             true,
             _fileSystem.currentDirectory,
             LaunchMode.attach,
-            _logger as AppRunLogger,
+            _logger as MachineOutputLogger,
           );
         } on Exception catch (error) {
           throwToolExit(error.toString());

packages/flutter_tools/lib/src/commands/daemon.dart

@@ -747,7 +747,7 @@ class AppDomain extends Domain {
       enableHotReload,
       cwd,
       LaunchMode.run,
-      asLogger<AppRunLogger>(globals.logger),
+      asLogger<MachineOutputLogger>(globals.logger),
     );
   }
 
@@ -759,7 +759,7 @@ class AppDomain extends Domain {
     bool enableHotReload,
     Directory cwd,
     LaunchMode launchMode,
-    AppRunLogger logger,
+    MachineOutputLogger logger,
   ) async {
     final app = AppInstance(
       _getNewAppId(),
@@ -771,8 +771,8 @@ class AppDomain extends Domain {
 
     // Set the domain and app for the given AppRunLogger. This allows the logger
     // to log messages containing the app ID to the host.
-    logger.domain = this;
-    logger.app = app;
+    logger._domain = this;
+    logger._app = app;
 
     _sendAppEvent(app, 'start', <String, Object?>{
       'deviceId': device.id,
@@ -1549,13 +1549,13 @@ class AppInstance {
     this.id, {
     required this.runner,
     this.logToStdout = false,
-    required AppRunLogger logger,
+    required MachineOutputLogger logger,
   }) : _logger = logger;
 
   final String id;
   final ResidentRunner runner;
   final bool logToStdout;
-  final AppRunLogger _logger;
+  final MachineOutputLogger _logger;
 
   Future<OperationResult> restart({bool fullRestart = false, bool pause = false, String? reason}) {
     return runner.restart(fullRestart: fullRestart, pause: pause, reason: reason);
@@ -1773,21 +1773,13 @@ class ProxyDomain extends Domain {
         ..createSync();
 }
 
-/// A [Logger] which sends log messages to a listening daemon client.
-///
-/// This class can either:
-///   1) Send stdout messages and progress events to the client IDE
-///   1) Log messages to stdout and send progress events to the client IDE
-//
-// TODO(devoncarew): To simplify this code a bit, we could choose to specialize
-// this class into two, one for each of the above use cases.
-class AppRunLogger extends DelegatingLogger {
-  AppRunLogger({required Logger parent}) : super(parent);
+/// A [Logger] which omits log messages to avoid breaking `--machine` formatting.
+final class MachineOutputLogger extends DelegatingLogger {
+  MachineOutputLogger({required Logger parent}) : super(parent);
 
-  AppDomain? domain;
-  late AppInstance app;
+  AppDomain? _domain;
+  late final AppInstance _app;
   var _nextProgressId = 0;
-
   Status? _status;
 
   @override
@@ -1814,7 +1806,7 @@ class AppRunLogger extends DelegatingLogger {
   }
 
   void close() {
-    domain = null;
+    _domain = null;
   }
 
   void _sendProgressEvent({
@@ -1823,13 +1815,7 @@ class AppRunLogger extends DelegatingLogger {
     bool finished = false,
     String? message,
   }) {
-    if (domain == null) {
-      // If we're sending progress events before an app has started, send the
-      // progress messages as plain status messages.
-      if (message != null) {
-        printStatus(message);
-      }
-    } else {
+    if (_domain case final domain?) {
       final event = <String, Object?>{
         'id': eventId,
         'progressId': eventType,
@@ -1837,16 +1823,14 @@ class AppRunLogger extends DelegatingLogger {
         'finished': finished,
       };
 
-      domain!._sendAppEvent(app, 'progress', event);
+      domain._sendAppEvent(_app, 'progress', event);
     }
   }
 
   @override
   void sendEvent(String name, [Map<String, Object?>? args, List<int>? binary]) {
-    if (domain == null) {
-      printStatus('event sent after app closed: $name');
-    } else {
-      domain!.sendEvent(name, args, binary);
+    if (_domain case final domain?) {
+      domain.sendEvent(name, args, binary);
     }
   }
 

packages/flutter_tools/test/commands.shard/hermetic/run_test.dart

@@ -539,7 +539,7 @@ void main() {
             FileSystem: () => fs,
             ProcessManager: () => FakeProcessManager.any(),
             Stdio: () => FakeStdio(),
-            Logger: () => AppRunLogger(parent: logger),
+            Logger: () => MachineOutputLogger(parent: logger),
           },
         );
 
@@ -565,7 +565,7 @@ void main() {
             FileSystem: () => fs,
             ProcessManager: () => FakeProcessManager.any(),
             Stdio: () => FakeStdio(),
-            Logger: () => AppRunLogger(parent: logger),
+            Logger: () => MachineOutputLogger(parent: logger),
           },
         );
       });

packages/flutter_tools/test/general.shard/base/logger_test.dart

@@ -99,7 +99,7 @@ void main() {
         daemon: false,
         windows: false,
       ),
-      isA<AppRunLogger>(),
+      isA<MachineOutputLogger>(),
     );
   });
 
@@ -249,7 +249,7 @@ void main() {
     expect(asLogger<VerboseLogger>(notifyingLogger), verboseLogger);
     expect(asLogger<FakeLogger>(notifyingLogger), fakeLogger);
 
-    expect(() => asLogger<AppRunLogger>(notifyingLogger), throwsStateError);
+    expect(() => asLogger<MachineOutputLogger>(notifyingLogger), throwsStateError);
   });
 
   group('AppContext', () {
@@ -796,13 +796,13 @@ void main() {
       expect(lines[3], equals('0123456789' * 3));
     });
 
-    testWithoutContext('AppRunLogger writes plain text statuses when no app is active', () async {
+    testWithoutContext('MachineFlagLogger does not output text statuses', () async {
       final buffer = BufferLogger.test();
-      final logger = AppRunLogger(parent: buffer);
+      final logger = MachineOutputLogger(parent: buffer);
 
       logger.startProgress('Test status...').stop();
 
-      expect(buffer.statusText.trim(), equals('Test status...'));
+      expect(buffer.statusText, isEmpty);
     });
 
     testWithoutContext('Error logs are wrapped and can be indented.', () async {