WebSocket client for VM service

runtime/bin/vmservice/message.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.
+
+part of vmservice;
+
+class Message {
+  final Completer _completer = new Completer.sync();
+  bool get completed => _completer.isCompleted;
+  Future get future => _completer.future;
+
+  final List<String> path = new List<String>();
+  final Map<String, String> parameters = new Map<String, String>();
+
+  Message.fromUri(Uri uri) {
+    var split = uri.path.split('/');
+    if (split.length == 0) {
+      setErrorResponse('Invalid uri: $uri.');
+      return;
+    }
+    for (int i = 0; i < split.length; i++) {
+      var pathSegment = split[i];
+      if (pathSegment == '') {
+        continue;
+      }
+      path.add(pathSegment);
+    }
+    parameters.addAll(uri.queryParameters);
+  }
+
+  Message.fromMap(Map map) {
+    if (map['path'] != null) {
+      path.addAll(map['path']);
+    }
+    if (map['parameters'] != null) {
+      parameters.addAll(map['parameters']);
+    }
+  }
+
+  Map toJson() {
+    return {
+      'path': path,
+      'parameters': parameters
+    };
+  }
+
+  Future 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 = parameters.keys.toList();
+    var values = parameters.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,
+        'parameters': parameters
+    }));
+  }
+}