Revert "Stream logging from attached debugger on iOS (#66092) (#66390)" (#66397)

This reverts commit 2be4570d.

packages/flutter_tools/lib/src/ios/devices.dart

@@ -212,9 +212,6 @@ class IOSDevice extends Device {
 
   DevicePortForwarder _portForwarder;
 
-  @visibleForTesting
-  IOSDeployDebugger iosDeployDebugger;
-
   @override
   Future<bool> get isLocalEmulator async => false;
 
@@ -398,38 +395,23 @@ class IOSDevice extends Device {
         timeout: timeoutConfiguration.slowOperation);
     try {
       ProtocolDiscovery observatoryDiscovery;
-      int installationResult = 1;
       if (debuggingOptions.debuggingEnabled) {
         _logger.printTrace('Debugging is enabled, connecting to observatory');
-        iosDeployDebugger = _iosDeploy.prepareDebuggerForLaunch(
-          deviceId: id,
-          bundlePath: bundle.path,
-          launchArguments: launchArguments,
-          interfaceType: interfaceType,
-        );
-
-        final DeviceLogReader deviceLogReader = getLogReader(app: package);
-        if (deviceLogReader is IOSDeviceLogReader) {
-          deviceLogReader.debuggerStream = iosDeployDebugger;
-        }
         observatoryDiscovery = ProtocolDiscovery.observatory(
-          deviceLogReader,
+          getLogReader(app: package),
           portForwarder: portForwarder,
-          throttleDuration: fallbackPollingDelay,
-          throttleTimeout: fallbackThrottleTimeout ?? const Duration(seconds: 5),
           hostPort: debuggingOptions.hostVmServicePort,
           devicePort: debuggingOptions.deviceVmServicePort,
           ipv6: ipv6,
+          throttleTimeout: fallbackThrottleTimeout ?? const Duration(seconds: 1),
         );
-        installationResult = await iosDeployDebugger.launchAndAttach() ? 0 : 1;
-      } else {
-        installationResult = await _iosDeploy.launchApp(
+      }
+      final int installationResult = await _iosDeploy.runApp(
         deviceId: id,
         bundlePath: bundle.path,
         launchArguments: launchArguments,
         interfaceType: interfaceType,
       );
-      }
       if (installationResult != 0) {
         _logger.printError('Could not run ${bundle.path} on $id.');
         _logger.printError('Try launching Xcode and selecting "Product > Run" to fix the problem:');
@@ -483,11 +465,7 @@ class IOSDevice extends Device {
     IOSApp app, {
     String userIdentifier,
   }) async {
-    // If the debugger is not attached, killing the ios-deploy process won't stop the app.
-    if (iosDeployDebugger!= null && iosDeployDebugger.debuggerAttached) {
-      // Avoid null.
-      return iosDeployDebugger?.exit() == true;
-    }
+    // Currently we don't have a way to stop an app running on iOS.
     return false;
   }
 
@@ -677,13 +655,6 @@ class IOSDeviceLogReader extends DeviceLogReader {
   // Matches a syslog line from any app.
   RegExp _anyLineRegex;
 
-  // Logging from native code/Flutter engine is prefixed by timestamp and process metadata:
-  // 2020-09-15 19:15:10.931434-0700 Runner[541:226276] Did finish launching.
-  // 2020-09-15 19:15:10.931434-0700 Runner[541:226276] [Category] Did finish launching.
-  //
-  // Logging from the dart code has no prefixing metadata.
-  final RegExp _debuggerLoggingRegex = RegExp(r'^\S* \S* \S*\[[0-9:]*] (.*)');
-
   StreamController<String> _linesController;
   List<StreamSubscription<void>> _loggingSubscriptions;
 
@@ -716,10 +687,6 @@ class IOSDeviceLogReader extends DeviceLogReader {
     }
 
     void logMessage(vm_service.Event event) {
-      if (_iosDeployDebugger != null && _iosDeployDebugger.debuggerAttached) {
-        // Prefer the more complete logs from the  attached debugger.
-        return;
-      }
       final String message = processVmServiceMessage(event);
       if (message.isNotEmpty) {
         _linesController.add(message);
@@ -732,26 +699,6 @@ class IOSDeviceLogReader extends DeviceLogReader {
     ]);
   }
 
-  /// Log reader will listen to [debugger.logLines] and will detach debugger on dispose.
-  set debuggerStream(IOSDeployDebugger debugger) {
-    // Logging is gathered from syslog on iOS 13 and earlier.
-    if (_majorSdkVersion < _minimumUniversalLoggingSdkVersion) {
-      return;
-    }
-    _iosDeployDebugger = debugger;
-    // Add the debugger logs to the controller created on initialization.
-    _loggingSubscriptions.add(debugger.logLines.listen(
-      (String line) => _linesController.add(_debuggerLineHandler(line)),
-      onError: _linesController.addError,
-      onDone: _linesController.close,
-      cancelOnError: true,
-    ));
-  }
-  IOSDeployDebugger _iosDeployDebugger;
-
-  // Strip off the logging metadata (leave the category), or just echo the line.
-  String _debuggerLineHandler(String line) => _debuggerLoggingRegex?.firstMatch(line)?.group(1) ?? line;
-
   void _listenToSysLog() {
     // syslog is not written on iOS 13+.
     if (_majorSdkVersion >= _minimumUniversalLoggingSdkVersion) {
@@ -811,7 +758,6 @@ class IOSDeviceLogReader extends DeviceLogReader {
       loggingSubscription.cancel();
     }
     _idevicesyslogProcess?.kill();
-    _iosDeployDebugger?.detach();
   }
 }
 

packages/flutter_tools/lib/src/ios/fallback_discovery.dart

@@ -82,50 +82,50 @@ class FallbackDiscovery {
     }
 
     try {
-      final Uri result = await _protocolDiscovery.uri;
+      final Uri result = await _mDnsObservatoryDiscovery.getObservatoryUri(
+        packageId,
+        device,
+        usesIpv6: usesIpv6,
+        hostVmservicePort: hostVmservicePort,
+      );
       if (result != null) {
         UsageEvent(
           _kEventName,
-          'log-success',
+          'mdns-success',
           flutterUsage: _flutterUsage,
         ).send();
         return result;
       }
-    } on ArgumentError {
-      // In the event of an invalid InternetAddress, this code attempts to catch
-      // an ArgumentError from protocol_discovery.dart
     } on Exception catch (err) {
       _logger.printTrace(err.toString());
     }
-    _logger.printTrace('Failed to connect with log scanning, falling back to mDNS');
+    _logger.printTrace('Failed to connect with mDNS, falling back to log scanning');
     UsageEvent(
       _kEventName,
-      'log-failure',
+      'mdns-failure',
       flutterUsage: _flutterUsage,
     ).send();
 
     try {
-      final Uri result = await _mDnsObservatoryDiscovery.getObservatoryUri(
-        packageId,
-        device,
-        usesIpv6: usesIpv6,
-        hostVmservicePort: hostVmservicePort,
-      );
+      final Uri result = await _protocolDiscovery.uri;
       if (result != null) {
         UsageEvent(
           _kEventName,
-          'mdns-success',
+          'fallback-success',
           flutterUsage: _flutterUsage,
         ).send();
         return result;
       }
+    } on ArgumentError {
+    // In the event of an invalid InternetAddress, this code attempts to catch
+    // an ArgumentError from protocol_discovery.dart
     } on Exception catch (err) {
       _logger.printTrace(err.toString());
     }
-    _logger.printTrace('Failed to connect with mDNS');
+    _logger.printTrace('Failed to connect with log scanning');
     UsageEvent(
       _kEventName,
-      'mdns-failure',
+      'fallback-failure',
       flutterUsage: _flutterUsage,
     ).send();
     return null;
@@ -148,7 +148,7 @@ class FallbackDiscovery {
       assumedWsUri = Uri.parse('ws://localhost:$hostPort/ws');
     } on Exception catch (err) {
       _logger.printTrace(err.toString());
-      _logger.printTrace('Failed to connect directly, falling back to log scanning');
+      _logger.printTrace('Failed to connect directly, falling back to mDNS');
       _sendFailureEvent(err, assumedDevicePort);
       return null;
     }

packages/flutter_tools/lib/src/protocol_discovery.dart

@@ -34,7 +34,7 @@ class ProtocolDiscovery {
   factory ProtocolDiscovery.observatory(
     DeviceLogReader logReader, {
     DevicePortForwarder portForwarder,
-    Duration throttleDuration,
+    Duration throttleDuration = const Duration(milliseconds: 200),
     Duration throttleTimeout,
     @required int hostPort,
     @required int devicePort,
@@ -45,7 +45,7 @@ class ProtocolDiscovery {
       logReader,
       kObservatoryService,
       portForwarder: portForwarder,
-      throttleDuration: throttleDuration ?? const Duration(milliseconds: 200),
+      throttleDuration: throttleDuration,
       throttleTimeout: throttleTimeout,
       hostPort: hostPort,
       devicePort: devicePort,
@@ -225,7 +225,7 @@ class _BufferedStreamController<T> {
 ///
 /// For example, consider a `waitDuration` of `10ms`, and list of event names
 /// and arrival times: `a (0ms), b (5ms), c (11ms), d (21ms)`.
-/// The events `a`, `c`, and `d` will be produced as a result.
+/// The events `c` and `d` will be produced as a result.
 StreamTransformer<S, S> _throttle<S>({
   @required Duration waitDuration,
 }) {
@@ -240,13 +240,10 @@ StreamTransformer<S, S> _throttle<S>({
       handleData: (S value, EventSink<S> sink) {
         latestLine = value;
 
-        final bool isFirstMessage = lastExecution == null;
         final int currentTime = DateTime.now().millisecondsSinceEpoch;
         lastExecution ??= currentTime;
         final int remainingTime = currentTime - lastExecution;
-
-        // Always send the first event immediately.
-        final int nextExecutionTime = isFirstMessage || remainingTime > waitDuration.inMilliseconds
+        final int nextExecutionTime = remainingTime > waitDuration.inMilliseconds
           ? 0
           : waitDuration.inMilliseconds - remainingTime;
 

packages/flutter_tools/test/general.shard/ios/ios_deploy_test.dart

@@ -2,15 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'dart:async';
-import 'dart:convert';
-
 import 'package:flutter_tools/src/artifacts.dart';
-import 'package:flutter_tools/src/base/file_system.dart';
 import 'package:flutter_tools/src/base/logger.dart';
 import 'package:flutter_tools/src/base/platform.dart';
 import 'package:flutter_tools/src/cache.dart';
-import 'package:flutter_tools/src/ios/devices.dart';
 import 'package:flutter_tools/src/ios/ios_deploy.dart';
 import 'package:mockito/mockito.dart';
 import 'package:process/process.dart';
@@ -26,186 +21,7 @@ void main () {
     expect(environment['PATH'], startsWith('/usr/bin'));
   });
 
-  group('IOSDeploy.prepareDebuggerForLaunch', () {
-    testWithoutContext('calls ios-deploy with correct arguments and returns when debugger attaches', () async {
-      final FakeProcessManager processManager = FakeProcessManager.list(<FakeCommand>[
-        FakeCommand(
-          command: <String>[
-            'script',
-            '-t',
-            '0',
-            '/dev/null',
-            'ios-deploy',
-            '--id',
-            '123',
-            '--bundle',
-            '/',
-            '--debug',
-            '--args',
-            <String>[
-              '--enable-dart-profiling',
-            ].join(' '),
-          ], environment: const <String, String>{
-            'PATH': '/usr/bin:/usr/local/bin:/usr/bin',
-            'DYLD_LIBRARY_PATH': '/path/to/libs',
-          },
-          stdout: '(lldb)     run\nsuccess\nDid finish launching.',
-        ),
-      ]);
-      final IOSDeploy iosDeploy = setUpIOSDeploy(processManager);
-      final IOSDeployDebugger iosDeployDebugger = iosDeploy.prepareDebuggerForLaunch(
-        deviceId: '123',
-        bundlePath: '/',
-        launchArguments: <String>['--enable-dart-profiling'],
-        interfaceType: IOSDeviceInterface.network,
-      );
-
-      expect(await iosDeployDebugger.launchAndAttach(), isTrue);
-      expect(await iosDeployDebugger.logLines.toList(), <String>['Did finish launching.']);
-      expect(processManager.hasRemainingExpectations, false);
-    });
-  });
-
-  group('IOSDeployDebugger', () {
-    group('launch', () {
-      BufferLogger logger;
-
-      setUp(() {
-        logger = BufferLogger.test();
-      });
-
-      testWithoutContext('debugger attached', () async {
-        final FakeProcessManager processManager = FakeProcessManager.list(<FakeCommand>[
-          const FakeCommand(
-            command: <String>['ios-deploy'],
-            stdout: '(lldb)     run\r\nsuccess\r\nsuccess\r\nLog on attach1\r\n\r\nLog on attach2\r\n\r\n\r\n\r\nPROCESS_STOPPED\r\nLog after process exit',
-          ),
-        ]);
-        final IOSDeployDebugger iosDeployDebugger = IOSDeployDebugger.test(
-          processManager: processManager,
-          logger: logger,
-        );
-        final List<String> receivedLogLines = <String>[];
-        final Stream<String> logLines = iosDeployDebugger.logLines
-          ..listen(receivedLogLines.add);
-
-        expect(await iosDeployDebugger.launchAndAttach(), isTrue);
-        await logLines.toList();
-        expect(receivedLogLines, <String>[
-          'success', // ignore first "success" from lldb, but log subsequent ones from real logging.
-          'Log on attach1',
-          'Log on attach2',
-          '', '']);
-      });
-
-      testWithoutContext('attach failed', () async {
-        final FakeProcessManager processManager = FakeProcessManager.list(<FakeCommand>[
-          const FakeCommand(
-            command: <String>['ios-deploy'],
-            // A success after an error should never happen, but test that we're handling random "successes" anyway.
-            stdout: '(lldb)     run\r\nerror: process launch failed\r\nsuccess\r\nLog on attach1',
-          ),
-        ]);
-        final IOSDeployDebugger iosDeployDebugger = IOSDeployDebugger.test(
-          processManager: processManager,
-          logger: logger,
-        );
-        final List<String> receivedLogLines = <String>[];
-        final Stream<String> logLines = iosDeployDebugger.logLines
-          ..listen(receivedLogLines.add);
-
-        expect(await iosDeployDebugger.launchAndAttach(), isFalse);
-        await logLines.toList();
-        // Debugger lines are double spaced, separated by an extra \r\n. Skip the extra lines.
-        // Still include empty lines other than the extra added newlines.
-        expect(receivedLogLines, isEmpty);
-      });
-
-      testWithoutContext('no provisioning profile 1, stdout', () async {
-        final FakeProcessManager processManager = FakeProcessManager.list(<FakeCommand>[
-          const FakeCommand(
-            command: <String>['ios-deploy'],
-            stdout: 'Error 0xe8008015',
-          ),
-        ]);
-        final IOSDeployDebugger iosDeployDebugger = IOSDeployDebugger.test(
-          processManager: processManager,
-          logger: logger,
-        );
-
-        await iosDeployDebugger.launchAndAttach();
-        expect(logger.errorText, contains('No Provisioning Profile was found'));
-      });
-
-      testWithoutContext('no provisioning profile 2, stderr', () async {
-        final FakeProcessManager processManager = FakeProcessManager.list(<FakeCommand>[
-          const FakeCommand(
-            command: <String>['ios-deploy'],
-            stderr: 'Error 0xe8000067',
-          ),
-        ]);
-        final IOSDeployDebugger iosDeployDebugger = IOSDeployDebugger.test(
-          processManager: processManager,
-          logger: logger,
-        );
-        await iosDeployDebugger.launchAndAttach();
-        expect(logger.errorText, contains('No Provisioning Profile was found'));
-      });
-
-      testWithoutContext('device locked', () async {
-        final FakeProcessManager processManager = FakeProcessManager.list(<FakeCommand>[
-          const FakeCommand(
-            command: <String>['ios-deploy'],
-            stdout: 'e80000e2',
-          ),
-        ]);
-        final IOSDeployDebugger iosDeployDebugger = IOSDeployDebugger.test(
-          processManager: processManager,
-          logger: logger,
-        );
-        await iosDeployDebugger.launchAndAttach();
-        expect(logger.errorText, contains('Your device is locked.'));
-      });
-
-      testWithoutContext('device locked', () async {
-        final FakeProcessManager processManager = FakeProcessManager.list(<FakeCommand>[
-          const FakeCommand(
-            command: <String>['ios-deploy'],
-            stdout: 'Error 0xe8000022',
-          ),
-        ]);
-        final IOSDeployDebugger iosDeployDebugger = IOSDeployDebugger.test(
-          processManager: processManager,
-          logger: logger,
-        );
-        await iosDeployDebugger.launchAndAttach();
-        expect(logger.errorText, contains('Try launching from within Xcode'));
-      });
-    });
-
-    testWithoutContext('detach', () async {
-      final StreamController<List<int>> stdin = StreamController<List<int>>();
-      final Stream<String> stdinStream = stdin.stream.transform<String>(const Utf8Decoder());
-      final FakeProcessManager processManager = FakeProcessManager.list(<FakeCommand>[
-        FakeCommand(
-          command: const <String>[
-            'ios-deploy',
-          ],
-          stdout: '(lldb)     run\nsuccess',
-          stdin: IOSink(stdin.sink),
-        ),
-      ]);
-      final IOSDeployDebugger iosDeployDebugger = IOSDeployDebugger.test(
-        processManager: processManager,
-      );
-      await iosDeployDebugger.launchAndAttach();
-      iosDeployDebugger.detach();
-      expect(await stdinStream.first, 'process detach');
-    });
-  });
-
-  group('IOSDeploy.uninstallApp', () {
-    testWithoutContext('calls ios-deploy with correct arguments and returns 0 on success', () async {
+  testWithoutContext('IOSDeploy.uninstallApp calls ios-deploy with correct arguments and returns 0 on success', () async {
     const String deviceId = '123';
     const String bundleId = 'com.example.app';
     final FakeProcessManager processManager = FakeProcessManager.list(<FakeCommand>[
@@ -228,7 +44,7 @@ void main () {
     expect(processManager.hasRemainingExpectations, false);
   });
 
-    testWithoutContext('returns non-zero exit code when ios-deploy does the same', () async {
+  testWithoutContext('IOSDeploy.uninstallApp returns non-zero exit code when ios-deploy does the same', () async {
     const String deviceId = '123';
     const String bundleId = 'com.example.app';
     final FakeProcessManager processManager = FakeProcessManager.list(<FakeCommand>[
@@ -250,7 +66,6 @@ void main () {
     expect(exitCode, 1);
     expect(processManager.hasRemainingExpectations, false);
   });
-  });
 }
 
 IOSDeploy setUpIOSDeploy(ProcessManager processManager) {

packages/flutter_tools/test/general.shard/ios/ios_device_logger_test.dart

@@ -10,7 +10,6 @@ import 'package:flutter_tools/src/build_info.dart';
 import 'package:flutter_tools/src/convert.dart';
 import 'package:flutter_tools/src/device.dart';
 import 'package:flutter_tools/src/ios/devices.dart';
-import 'package:flutter_tools/src/ios/ios_deploy.dart';
 import 'package:flutter_tools/src/ios/mac.dart';
 import 'package:mockito/mockito.dart';
 import 'package:vm_service/vm_service.dart';
@@ -34,7 +33,6 @@ void main() {
       .thenReturn('idevice-syslog');
   });
 
-  group('syslog stream', () {
   testWithoutContext('decodeSyslog decodes a syslog-encoded line', () {
     final String decoded = decodeSyslog(
       r'I \M-b\M^]\M-$\M-o\M-8\M^O syslog \M-B\M-/\'
@@ -143,9 +141,7 @@ Runner(libsystem_asl.dylib)[297] <Notice>: libMobileGestalt
       '  with a non-Flutter log message following it.',
     ]);
   });
-  });
 
-  group('VM service', () {
   testWithoutContext('IOSDeviceLogReader can listen to VM Service logs', () async {
     final MockVmService vmService = MockVmService();
     final DeviceLogReader logReader = IOSDeviceLogReader.test(
@@ -194,136 +190,7 @@ Runner(libsystem_asl.dylib)[297] <Notice>: libMobileGestalt
       equals('  And this is an error '),
     ]));
   });
-
-    testWithoutContext('IOSDeviceLogReader ignores VM Service logs when attached to debugger', () async {
-      final MockVmService vmService = MockVmService();
-      final IOSDeviceLogReader logReader = IOSDeviceLogReader.test(
-        useSyslog: false,
-        iMobileDevice: IMobileDevice(
-          artifacts: artifacts,
-          processManager: processManager,
-          cache: fakeCache,
-          logger: logger,
-        ),
-      );
-      final StreamController<Event> stdoutController = StreamController<Event>();
-      final StreamController<Event> stderController = StreamController<Event>();
-      final Completer<Success> stdoutCompleter = Completer<Success>();
-      final Completer<Success> stderrCompleter = Completer<Success>();
-      when(vmService.streamListen('Stdout')).thenAnswer((Invocation invocation) {
-        return stdoutCompleter.future;
-      });
-      when(vmService.streamListen('Stderr')).thenAnswer((Invocation invocation) {
-        return stderrCompleter.future;
-      });
-      when(vmService.onStdoutEvent).thenAnswer((Invocation invocation) {
-        return stdoutController.stream;
-      });
-      when(vmService.onStderrEvent).thenAnswer((Invocation invocation) {
-        return stderController.stream;
-      });
-      logReader.connectedVMService = vmService;
-
-      stdoutCompleter.complete(Success());
-      stderrCompleter.complete(Success());
-      stdoutController.add(Event(
-        kind: 'Stdout',
-        timestamp: 0,
-        bytes: base64.encode(utf8.encode('  This is a message ')),
-      ));
-      stderController.add(Event(
-        kind: 'Stderr',
-        timestamp: 0,
-        bytes: base64.encode(utf8.encode('  And this is an error ')),
-      ));
-
-      final MockIOSDeployDebugger iosDeployDebugger = MockIOSDeployDebugger();
-      when(iosDeployDebugger.debuggerAttached).thenReturn(true);
-
-      final Stream<String> debuggingLogs = Stream<String>.fromIterable(<String>[
-        'Message from debugger'
-      ]);
-      when(iosDeployDebugger.logLines).thenAnswer((Invocation invocation) => debuggingLogs);
-      logReader.debuggerStream = iosDeployDebugger;
-
-      // Wait for stream listeners to fire.
-      await expectLater(logReader.logLines, emitsInAnyOrder(<Matcher>[
-        equals('Message from debugger'),
-      ]));
-    });
-  });
-
-  group('debugger stream', () {
-    testWithoutContext('IOSDeviceLogReader removes metadata prefix from lldb output', () async {
-      final Stream<String> debuggingLogs = Stream<String>.fromIterable(<String>[
-        '2020-09-15 19:15:10.931434-0700 Runner[541:226276] Did finish launching.',
-        '2020-09-15 19:15:10.931434-0700 Runner[541:226276] [Category] Did finish launching from logging category.',
-        'stderr from dart',
-        '',
-      ]);
-
-      final IOSDeviceLogReader logReader = IOSDeviceLogReader.test(
-        iMobileDevice: IMobileDevice(
-          artifacts: artifacts,
-          processManager: processManager,
-          cache: fakeCache,
-          logger: logger,
-        ),
-        useSyslog: false,
-      );
-      final MockIOSDeployDebugger iosDeployDebugger = MockIOSDeployDebugger();
-      when(iosDeployDebugger.logLines).thenAnswer((Invocation invocation) => debuggingLogs);
-      logReader.debuggerStream = iosDeployDebugger;
-      final Future<List<String>> logLines = logReader.logLines.toList();
-
-      expect(await logLines, <String>[
-        'Did finish launching.',
-        '[Category] Did finish launching from logging category.',
-        'stderr from dart',
-        '',
-      ]);
-    });
-
-    testWithoutContext('errors on debugger stream closes log stream', () async {
-      final Stream<String> debuggingLogs = Stream<String>.error('ios-deploy error');
-      final IOSDeviceLogReader logReader = IOSDeviceLogReader.test(
-        iMobileDevice: IMobileDevice(
-          artifacts: artifacts,
-          processManager: processManager,
-          cache: fakeCache,
-          logger: logger,
-        ),
-        useSyslog: false,
-      );
-      final Completer<void> streamComplete = Completer<void>();
-      final MockIOSDeployDebugger iosDeployDebugger = MockIOSDeployDebugger();
-      when(iosDeployDebugger.logLines).thenAnswer((Invocation invocation) => debuggingLogs);
-      logReader.logLines.listen(null, onError: (Object error) => streamComplete.complete());
-      logReader.debuggerStream = iosDeployDebugger;
-
-      await streamComplete.future;
-    });
-
-    testWithoutContext('detaches debugger', () async {
-      final IOSDeviceLogReader logReader = IOSDeviceLogReader.test(
-        iMobileDevice: IMobileDevice(
-          artifacts: artifacts,
-          processManager: processManager,
-          cache: fakeCache,
-          logger: logger,
-        ),
-        useSyslog: false,
-      );
-      final MockIOSDeployDebugger iosDeployDebugger = MockIOSDeployDebugger();
-      when(iosDeployDebugger.logLines).thenAnswer((Invocation invocation) => const Stream<String>.empty());
-      logReader.debuggerStream = iosDeployDebugger;
-
-      logReader.dispose();
-      verify(iosDeployDebugger.detach());
-    });
-  });
 }
 
 class MockArtifacts extends Mock implements Artifacts {}
 class MockVmService extends Mock implements VmService {}
-class MockIOSDeployDebugger extends Mock implements IOSDeployDebugger {}

packages/flutter_tools/test/general.shard/ios/ios_device_start_prebuilt_test.dart

@@ -67,25 +67,19 @@ const FakeCommand kLaunchReleaseCommand = FakeCommand(
 
 // The command used to actually launch the app with args in debug.
 const FakeCommand kLaunchDebugCommand = FakeCommand(command: <String>[
-  'script',
-  '-t',
-  '0',
-  '/dev/null',
   'ios-deploy',
   '--id',
   '123',
   '--bundle',
   '/',
-  '--debug',
   '--no-wifi',
+  '--justlaunch',
   '--args',
   '--enable-dart-profiling --enable-service-port-fallback --disable-service-auth-codes --observatory-port=60700 --enable-checked-mode --verify-entry-points'
 ], environment: <String, String>{
   'PATH': '/usr/bin:null',
   'DYLD_LIBRARY_PATH': '/path/to/libraries',
-},
-stdout: '(lldb)     run\nsuccess',
-);
+});
 
 void main() {
   // TODO(jonahwilliams): This test doesn't really belong here but
@@ -108,7 +102,7 @@ void main() {
   });
 
   // Still uses context for analytics and mDNS.
-  testUsingContext('IOSDevice.startApp succeeds in debug mode via mDNS discovery when log reading fails', () async {
+  testUsingContext('IOSDevice.startApp succeeds in debug mode via mDNS discovery', () async {
     final FileSystem fileSystem = MemoryFileSystem.test();
     final FakeProcessManager processManager = FakeProcessManager.list(<FakeCommand>[
       kDeployCommand,
@@ -151,7 +145,6 @@ void main() {
       debuggingOptions: DebuggingOptions.enabled(BuildInfo.debug),
       platformArgs: <String, dynamic>{},
       fallbackPollingDelay: Duration.zero,
-      fallbackThrottleTimeout: const Duration(milliseconds: 10),
     );
 
     verify(globals.flutterUsage.sendEvent('ios-handshake', 'mdns-success')).called(1);
@@ -164,7 +157,7 @@ void main() {
   });
 
   // Still uses context for analytics and mDNS.
-  testUsingContext('IOSDevice.startApp succeeds in debug mode via log reading', () async {
+  testUsingContext('IOSDevice.startApp succeeds in debug mode when mDNS fails', () async {
     final FileSystem fileSystem = MemoryFileSystem.test();
     final FakeProcessManager processManager = FakeProcessManager.list(<FakeCommand>[
       kDeployCommand,
@@ -190,32 +183,34 @@ void main() {
     device.portForwarder = const NoOpDevicePortForwarder();
     device.setLogReader(iosApp, deviceLogReader);
 
-    // Start writing messages to the log reader.
+    // Now that the reader is used, start writing messages to it.
     Timer.run(() {
       deviceLogReader.addLine('Foo');
       deviceLogReader.addLine('Observatory listening on http://127.0.0.1:456');
     });
+    when(MDnsObservatoryDiscovery.instance.getObservatoryUri(any, any, usesIpv6: anyNamed('usesIpv6')))
+      .thenAnswer((Invocation invocation) async => null);
 
     final LaunchResult launchResult = await device.startApp(iosApp,
       prebuiltApplication: true,
       debuggingOptions: DebuggingOptions.enabled(BuildInfo.debug),
       platformArgs: <String, dynamic>{},
       fallbackPollingDelay: Duration.zero,
-      fallbackThrottleTimeout: const Duration(milliseconds: 10),
     );
 
     expect(launchResult.started, true);
     expect(launchResult.hasObservatory, true);
-    verify(globals.flutterUsage.sendEvent('ios-handshake', 'log-success')).called(1);
-    verifyNever(globals.flutterUsage.sendEvent('ios-handshake', 'mdns-failure'));
+    verify(globals.flutterUsage.sendEvent('ios-handshake', 'mdns-failure')).called(1);
+    verify(globals.flutterUsage.sendEvent('ios-handshake', 'fallback-success')).called(1);
     expect(await device.stopApp(iosApp), false);
   }, overrides: <Type, Generator>{
-    MDnsObservatoryDiscovery: () => MockMDnsObservatoryDiscovery(),
     Usage: () => MockUsage(),
+    MDnsObservatoryDiscovery: () => MockMDnsObservatoryDiscovery(),
   });
 
   // Still uses context for analytics and mDNS.
-  testUsingContext('IOSDevice.startApp fails in debug mode when Observatory URI is malformed', () async {
+  testUsingContext('IOSDevice.startApp fails in debug mode when mDNS fails and '
+    'when Observatory URI is malformed', () async {
     final FileSystem fileSystem = MemoryFileSystem.test();
     final FakeProcessManager processManager = FakeProcessManager.list(<FakeCommand>[
       kDeployCommand,
@@ -244,15 +239,16 @@ void main() {
     // Now that the reader is used, start writing messages to it.
     Timer.run(() {
       deviceLogReader.addLine('Foo');
-      deviceLogReader.addLine('Observatory listening on http://127.0.0.1:456abc');
+      deviceLogReader.addLine('Observatory listening on http:/:/127.0.0.1:456');
     });
+    when(MDnsObservatoryDiscovery.instance.getObservatoryUri(any, any, usesIpv6: anyNamed('usesIpv6')))
+      .thenAnswer((Invocation invocation) async => null);
 
     final LaunchResult launchResult = await device.startApp(iosApp,
       prebuiltApplication: true,
       debuggingOptions: DebuggingOptions.enabled(BuildInfo.debug),
       platformArgs: <String, dynamic>{},
       fallbackPollingDelay: Duration.zero,
-      // fallbackThrottleTimeout: const Duration(milliseconds: 10),
     );
 
     expect(launchResult.started, false);
@@ -263,8 +259,8 @@ void main() {
       label: anyNamed('label'),
       value: anyNamed('value'),
     )).called(1);
-    verify(globals.flutterUsage.sendEvent('ios-handshake', 'log-failure')).called(1);
     verify(globals.flutterUsage.sendEvent('ios-handshake', 'mdns-failure')).called(1);
+    verify(globals.flutterUsage.sendEvent('ios-handshake', 'fallback-failure')).called(1);
     }, overrides: <Type, Generator>{
       MDnsObservatoryDiscovery: () => MockMDnsObservatoryDiscovery(),
       Usage: () => MockUsage(),
@@ -392,7 +388,6 @@ void main() {
       debuggingOptions: DebuggingOptions.disabled(BuildInfo.release),
       platformArgs: <String, dynamic>{},
       fallbackPollingDelay: Duration.zero,
-      fallbackThrottleTimeout: const Duration(milliseconds: 10),
     );
 
     expect(launchResult.started, true);
@@ -410,17 +405,13 @@ void main() {
       kDeployCommand,
       FakeCommand(
         command: <String>[
-          'script',
-          '-t',
-          '0',
-          '/dev/null',
           'ios-deploy',
           '--id',
           '123',
           '--bundle',
           '/',
-          '--debug',
           '--no-wifi',
+          '--justlaunch',
           // The arguments below are determined by what is passed into
           // the debugging options argument to startApp.
           '--args',
@@ -445,8 +436,7 @@ void main() {
         ], environment: const <String, String>{
           'PATH': '/usr/bin:null',
           'DYLD_LIBRARY_PATH': '/path/to/libraries',
-        },
-        stdout: '(lldb)     run\nsuccess',
+        }
       )
     ]);
     final IOSDevice device = setUpIOSDevice(
@@ -465,15 +455,22 @@ void main() {
       bundleName: 'Runner',
       bundleDir: fileSystem.currentDirectory,
     );
-    final FakeDeviceLogReader deviceLogReader = FakeDeviceLogReader();
+    final Uri uri = Uri(
+      scheme: 'http',
+      host: '127.0.0.1',
+      port: 1234,
+      path: 'observatory',
+    );
 
+    device.setLogReader(iosApp, FakeDeviceLogReader());
     device.portForwarder = const NoOpDevicePortForwarder();
-    device.setLogReader(iosApp, deviceLogReader);
 
-    // Start writing messages to the log reader.
-    Timer.run(() {
-      deviceLogReader.addLine('Observatory listening on http://127.0.0.1:1234');
-    });
+    when(MDnsObservatoryDiscovery.instance.getObservatoryUri(
+      any,
+      any,
+      usesIpv6: anyNamed('usesIpv6'),
+      hostVmservicePort: anyNamed('hostVmservicePort')
+    )).thenAnswer((Invocation invocation) async => uri);
 
     final LaunchResult launchResult = await device.startApp(iosApp,
       prebuiltApplication: true,
@@ -495,7 +492,6 @@ void main() {
       ),
       platformArgs: <String, dynamic>{},
       fallbackPollingDelay: Duration.zero,
-      fallbackThrottleTimeout: const Duration(milliseconds: 10),
     );
 
     expect(launchResult.started, true);