Serialize barback assets more efficiently.

pkg/barback/test/asset_test.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.test.asset_test;
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
+import 'dart:isolate';
 
 import 'package:barback/barback.dart';
+import 'package:barback/src/internal_asset.dart';
 import 'package:path/path.dart' as pathos;
 import 'package:unittest/unittest.dart';
 
 import 'utils.dart';
 
 /// The contents of the test binary file.
 final binaryContents = [0, 1, 2, 3, 4];
 
 main() {
   initConfig();
@@ skipping 186 matching lines @@
       });
     });
 
     group("file asset", () {
       test("shows the file path", () {
         var asset = new Asset.fromPath(id, "path.txt");
         expect(asset.toString(), equals('File "path.txt"'));
       });
     });
   });
+
+  group("across isolates", () {
+    getBytesFromIsolate(Asset asset) {
+      var port = new ReceivePort();
+      return Isolate.spawn(_getAssetBytes, {
+        'asset': serializeAsset(asset),
+        'replyTo': port.sendPort
+      }).then((_) => port.first);
+    }
+
+    test("gets the UTF-8-encoded string for a string asset", () {
+      var asset = new Asset.fromString(id, "çøñ†éℵ™");
+      expect(getBytesFromIsolate(asset),
+          completion(equals(UTF8.encode("çøñ†éℵ™"))));
+    });
+
+    test("gets the raw bytes for a byte asset", () {
+      var asset = new Asset.fromBytes(id, binaryContents);
+      expect(getBytesFromIsolate(asset),
+          completion(equals(binaryContents)));
+    });
+
+    test("gets the raw bytes for a binary file", () {
+      var asset = new Asset.fromPath(id, binaryFilePath);
+      expect(getBytesFromIsolate(asset),
+          completion(equals(binaryContents)));
+    });
+
+    test("gets the raw bytes for a text file", () {
+      var asset = new Asset.fromPath(id, textFilePath);
+      expect(getBytesFromIsolate(asset),
+          completion(equals(UTF8.encode("çøñ†éℵ™"))));
+    });
+
+    test("gets the raw bytes for a stream", () {
+      var asset = new Asset.fromStream(id,
+          new Stream.fromFuture(new Future.value(UTF8.encode("çøñ†éℵ™"))));
+      expect(getBytesFromIsolate(asset),
+          completion(equals(UTF8.encode("çøñ†éℵ™"))));
+    });
+  });
 }
+
+void _getAssetBytes(message) {
+  var asset = deserializeAsset(message['asset']);
+  var builder = asset.read().fold(new BytesBuilder(),
+      (builder, chunk) => builder..add(chunk));
+  builder.then((builder) => message['replyTo'].send(builder.takeBytes()));
+}