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f92f71feb9
This prevents multiple simultaneous runs of the analyzer from stomping over each other (e.g. multiple runs of 'update-packages'). Certain long-lived commands (like analyze, run, logs) are exempted once they've done enough work to be safe from most stomping action. This still doesn't make us entirely safe from craziness, e.g. if you're half way through an 'update-packages' run and you call 'git pull', who knows what state you'll end up in. But there's only so much one can do. Fixes https://github.com/flutter/flutter/issues/2762
79 lines
1.9 KiB
Dart
79 lines
1.9 KiB
Dart
// Copyright 2015 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'dart:async';
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import 'dart:io';
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import '../cache.dart';
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import '../device.dart';
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import '../globals.dart';
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import '../runner/flutter_command.dart';
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class LogsCommand extends FlutterCommand {
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LogsCommand() {
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argParser.addFlag('clear',
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negatable: false,
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abbr: 'c',
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help: 'Clear log history before reading from logs.'
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);
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}
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@override
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final String name = 'logs';
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@override
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final String description = 'Show log output for running Flutter apps.';
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@override
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bool get requiresProjectRoot => false;
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@override
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bool get requiresDevice => true;
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@override
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Future<int> runInProject() async {
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Device device = deviceForCommand;
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if (argResults['clear'])
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device.clearLogs();
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DeviceLogReader logReader = device.logReader;
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Cache.releaseLockEarly();
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printStatus('Showing $logReader logs:');
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Completer<int> exitCompleter = new Completer<int>();
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// Start reading.
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StreamSubscription<String> subscription = logReader.logLines.listen(
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printStatus,
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onDone: () {
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exitCompleter.complete(0);
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},
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onError: (dynamic error) {
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exitCompleter.complete(error is int ? error : 1);
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}
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);
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// When terminating, close down the log reader.
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ProcessSignal.SIGINT.watch().listen((ProcessSignal signal) {
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subscription.cancel();
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printStatus('');
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exitCompleter.complete(0);
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});
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ProcessSignal.SIGTERM.watch().listen((ProcessSignal signal) {
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subscription.cancel();
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exitCompleter.complete(0);
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});
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// Wait for the log reader to be finished.
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int result = await exitCompleter.future;
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subscription.cancel();
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if (result != 0)
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printError('Error listening to $logReader logs.');
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return result;
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}
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}
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