Service isolate rework

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 147 matching lines @@
   Future startup() {
     if (_server != null) {
       // Already running.
       return new Future.value(this);
     }
 
     // Startup HTTP server.
     return HttpServer.bind(_ip, _port).then((s) {
       _server = s;
       _server.listen(_requestHandler);
+      var ip = _server.address.address.toString();
       if (_displayMessages) {
-        var ip = _server.address.address.toString();
         var port = _server.port.toString();
         print('Observatory listening on http://$ip:$port');
       }
       // Server is up and running.
+      _notifyServerState(ip, _server.port);
       return this;
     }).catchError((e, st) {
       print('Could not start Observatory HTTP server:\n$e\n$st\n');
+      _notifyServerState("", 0);
       return this;
     });
   }
 
   Future shutdown(bool forced) {
     if (_server == null) {
       // Not started.
       return new Future.value(this);
     }
 
     // Force displaying of status messages if we are forcibly shutdown.
     _displayMessages = _displayMessages || forced;
 
     // Shutdown HTTP server and subscription.
     var ip = _server.address.address.toString();
     var port = _server.port.toString();
     return _server.close(force: forced).then((_) {
       if (_displayMessages) {
         print('Observatory no longer listening on http://$ip:$port');
       }
       _server = null;
+      _notifyServerState("", 0);
       return this;
     }).catchError((e, st) {
       _server = null;
       print('Could not shutdown Observatory HTTP server:\n$e\n$st\n');
+      _notifyServerState("", 0);
       return this;
     });
   }
 
 }
+
+void _notifyServerState(String ip, int port)
+    native "VMServiceIO_NotifyServerState";