Stop running pub get at gclient sync time and fix build bugs

mojo/public/dart/third_party/barback/lib/src/serialize.dart

+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+library barback.serialize;
+
+import 'dart:async';
+import 'dart:isolate';
+
+import 'package:stack_trace/stack_trace.dart';
+
+import 'asset/asset_id.dart';
+import 'utils.dart';
+
+/// Converts [id] into a serializable map.
+Map serializeId(AssetId id) => {'package': id.package, 'path': id.path};
+
+/// Converts [stream] into a [SendPort] with which another isolate can request
+/// the data from [stream].
+SendPort serializeStream(Stream stream) {
+  var receivePort = new ReceivePort();
+  receivePort.first.then((sendPort) {
+    stream.listen((data) => sendPort.send({'type': 'data', 'data': data}),
+        onDone: () => sendPort.send({'type': 'done'}),
+        onError: (error, stackTrace) {
+      sendPort.send({
+        'type': 'error',
+        'error': CrossIsolateException.serialize(error, stackTrace)
+      });
+    });
+  });
+
+  return receivePort.sendPort;
+}
+
+/// Converts a serializable map into an [AssetId].
+AssetId deserializeId(Map id) => new AssetId(id['package'], id['path']);
+
+/// Convert a [SendPort] whose opposite is waiting to send us a stream into a
+/// [Stream].
+///
+/// No stream data will actually be sent across the isolate boundary until
+/// someone subscribes to the returned stream.
+Stream deserializeStream(SendPort sendPort) {
+  return callbackStream(() {
+    var receivePort = new ReceivePort();
+    sendPort.send(receivePort.sendPort);
+    return receivePort.transform(
+        const StreamTransformer(_deserializeTransformer));
+  });
+}
+
+/// The body of a [StreamTransformer] that deserializes the values in a stream
+/// sent by [serializeStream].
+StreamSubscription _deserializeTransformer(Stream input, bool cancelOnError) {
+  var subscription;
+  var transformed = input.transform(new StreamTransformer.fromHandlers(
+      handleData: (data, sink) {
+    if (data['type'] == 'data') {
+      sink.add(data['data']);
+    } else if (data['type'] == 'error') {
+      var exception = new CrossIsolateException.deserialize(data['error']);
+      sink.addError(exception, exception.stackTrace);
+    } else {
+      assert(data['type'] == 'done');
+      sink.close();
+      subscription.cancel();
+    }
+  }));
+  subscription = transformed.listen(null, cancelOnError: cancelOnError);
+  return subscription;
+}
+
+/// An exception that was originally raised in another isolate.
+///
+/// Exception objects can't cross isolate boundaries in general, so this class
+/// wraps as much information as can be consistently serialized.
+class CrossIsolateException implements Exception {
+  /// The name of the type of exception thrown.
+  ///
+  /// This is the return value of [error.runtimeType.toString()]. Keep in mind
+  /// that objects in different libraries may have the same type name.
+  final String type;
+
+  /// The exception's message, or its [toString] if it didn't expose a `message`
+  /// property.
+  final String message;
+
+  /// The exception's stack chain, or `null` if no stack chain was available.
+  final Chain stackTrace;
+
+  /// Loads a [CrossIsolateException] from a serialized representation.
+  ///
+  /// [error] should be the result of [CrossIsolateException.serialize].
+  CrossIsolateException.deserialize(Map error)
+      : type = error['type'],
+        message = error['message'],
+        stackTrace = error['stack'] == null ? null :
+            new Chain.parse(error['stack']);
+
+  /// Serializes [error] to an object that can safely be passed across isolate
+  /// boundaries.
+  static Map serialize(error, [StackTrace stack]) {
+    if (stack == null && error is Error) stack = error.stackTrace;
+    return {
+      'type': error.runtimeType.toString(),
+      'message': getErrorMessage(error),
+      'stack': stack == null ? null : new Chain.forTrace(stack).toString()
+    };
+  }
+
+  String toString() => "$message\n$stackTrace";
+}