blob: c97c62ce35426fa694d1b0879dc7a494280f8e30 [file] [log] [blame]
// Copyright 2015 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.
import 'dart:async';
import '../base/common.dart';
import '../base/io.dart';
import '../cache.dart';
import '../device.dart';
import '../globals.dart';
import '../runner/flutter_command.dart';
class LogsCommand extends FlutterCommand {
LogsCommand() {
argParser.addFlag('clear',
negatable: false,
abbr: 'c',
help: 'Clear log history before reading from logs.',
);
}
@override
final String name = 'logs';
@override
final String description = 'Show log output for running Flutter apps.';
@override
Future<Set<DevelopmentArtifact>> get requiredArtifacts async => const <DevelopmentArtifact>{};
Device device;
@override
Future<FlutterCommandResult> verifyThenRunCommand(String commandPath) async {
device = await findTargetDevice();
if (device == null)
throwToolExit(null);
return super.verifyThenRunCommand(commandPath);
}
@override
Future<FlutterCommandResult> runCommand() async {
if (argResults['clear'])
device.clearLogs();
final DeviceLogReader logReader = device.getLogReader();
Cache.releaseLockEarly();
printStatus('Showing $logReader logs:');
final Completer<int> exitCompleter = Completer<int>();
// Start reading.
final StreamSubscription<String> subscription = logReader.logLines.listen(
(String message) => printStatus(message, wrap: false),
onDone: () {
exitCompleter.complete(0);
},
onError: (dynamic error) {
exitCompleter.complete(error is int ? error : 1);
},
);
// When terminating, close down the log reader.
ProcessSignal.SIGINT.watch().listen((ProcessSignal signal) {
subscription.cancel();
printStatus('');
exitCompleter.complete(0);
});
ProcessSignal.SIGTERM.watch().listen((ProcessSignal signal) {
subscription.cancel();
exitCompleter.complete(0);
});
// Wait for the log reader to be finished.
final int result = await exitCompleter.future;
await subscription.cancel();
if (result != 0)
throwToolExit('Error listening to $logReader logs.');
return null;
}
}