WebSocket client for VM service

runtime/bin/vmservice/message.dart

Index: runtime/bin/vmservice/message.dart
diff --git a/runtime/bin/vmservice/message.dart b/runtime/bin/vmservice/message.dart
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+++ b/runtime/bin/vmservice/message.dart
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+// 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.
+
+part of vmservice;
+
+class Message {
+  final Completer _completer = new Completer.sync();
+  bool get completed => _completer.isCompleted;
+  /// Future of response.
+  Future<String> get response => _completer.future;
+  /// Path.
+  final List<String> path = new List<String>();
+  /// Options.
+  final Map<String, String> options = new Map<String, String>();
+
+  void _setPath(List<String> pathSegments) {
+    if (pathSegments == null) {
+      return;
+    }
+    pathSegments.forEach((String segment) {
+      if (segment == null || segment == '') {
+        return;
+      }
+      path.add(segment);
+    });
+  }
+
+  Message.fromUri(Uri uri) {
+    var split = uri.path.split('/');
+    if (split.length == 0) {
+      setErrorResponse('Invalid uri: $uri.');
+      return;
+    }
+    _setPath(split);
+    options.addAll(uri.queryParameters);
+  }
+
+  Message.fromMap(Map map) {
+    _setPath(map['path']);
+    if (map['options'] != null) {
+      options.addAll(map['options']);
+    }
+  }
+
+  dynamic toJson() {
+    return {
+      'path': path,
+      'options': options
+    };
+  }
+
+  Future<String> send(SendPort sendPort) {
+    final receivePort = new RawReceivePort();
+    receivePort.handler = (value) {
+      receivePort.close();
+      if (value is Exception) {
+        _completer.completeError(value);
+      } else {
+        _completer.complete(value);
+      }
+    };
+    var keys = options.keys.toList();
+    var values = options.values.toList();
+    var request = [path, keys, values];
+    sendServiceMessage(sendPort, receivePort, request);
+    return _completer.future;
+  }
+
+  void setResponse(String response) {
+    _completer.complete(response);
+  }
+
+  void setErrorResponse(String error) {
+    _completer.complete(JSON.encode({
+        'type': 'Error',
+        'msg': error,
+        'path': path,
+        'options': options
+    }));
+  }
+}