RFC: Sending pre-encoded text over a web socket.

runtime/bin/vmservice/server.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_io;
 
 class WebSocketClient extends Client {
   static const int PARSE_ERROR_CODE = 4000;
   static const int BINARY_MESSAGE_ERROR_CODE = 4001;
   static const int NOT_MAP_ERROR_CODE = 4002;
@@ skipping 39 matching lines @@
       // Do nothing.
       return;
     }
     try {
       if (result is String || result is Uint8List) {
         socket.add(result);  // String or binary message.
       } else {
         // String message as external Uint8List.
         assert(result is List);
         Uint8List cstring = result[0];
-        // TODO(rmacnak): cstring may be large. Add a way to pass an encoded
-        // string to a web socket that will be sent as a text message to avoid
-        // the space overhead of converting cstring to a Dart string.
-        socket.add(UTF8.decode(cstring));
+        socket.addUtf8Text(cstring);
       }
     } catch (_) {
       print("Ignoring error posting over WebSocket.");
     }
   }
 
   dynamic toJson() {
     Map map = super.toJson();
     map['type'] = 'WebSocketClient';
     map['socket'] = '$socket';
@@ skipping 247 matching lines @@
       _notifyServerState("", 0);
       onServerAddressChange(null);
       return this;
     });
   }
 
 }
 
 void _notifyServerState(String ip, int port)
     native "VMServiceIO_NotifyServerState";