Extend Observatory to display libraries, classes, fields, functions and code.

runtime/bin/vmservice/client/lib/src/observatory/request_manager.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 observatory;
 
 /// A request response interceptor is called for each response.
 typedef void RequestResponseInterceptor();
 
-abstract class RequestManager extends Object with ChangeNotifierMixin {
+abstract class RequestManager extends Observable {
   ObservatoryApplication _application;
   ObservatoryApplication get application => _application;
   RequestResponseInterceptor interceptor;
 
   /// The default request prefix is 127.0.0.1 on port 8181.
-  @observable String get prefix => __$prefix; String __$prefix = 'http://127.0.0.1:8181'; set prefix(String value) { __$prefix = notifyPropertyChange(#prefix, __$prefix, value); }
+  @observable String prefix = 'http://127.0.0.1:8181';
   /// List of responses.
-  @observable List<Map> get responses => __$responses; List<Map> __$responses = toObservable([]); set responses(List<Map> value) { __$responses = notifyPropertyChange(#responses, __$responses, value); }
+  @observable List<Map> responses = toObservable([]);
 
   /// Parse
   void parseResponses(String responseString) {
     var r = JSON.decode(responseString);
     if (r is Map) {
       setResponses([r]);
     } else {
       setResponses(r);
     }
   }
 
   void setResponses(List<Map> r) {
     responses = toObservable(r);
     if (interceptor != null) {
       interceptor();
     }
   }
 
-  void setResponseError(String error) {
+  void setResponseError(HttpRequest request) {
+    String error = '${request.status} ${request.statusText}';
+    if (request.status == 0) {
+      error = 'No service found. Did you run with --enable-vm-service ?';
+    }
     setResponses([{
       'type': 'RequestError',
       'error': error
     }]);
   }
 
   /// Request [requestString] from the VM service. Updates [responses].
   /// Will trigger [interceptor] if one is set.
   Future<Map> get(String requestString) {
     request(requestString).then((responseString) {
       parseResponses(responseString);
     }).catchError((e) {
-      setResponseError(e.toString());
+      setResponseError(e.target);
     });
   }
 
   /// Abstract method. Given the [requestString], return a String in the
   /// future which contains the reply from the VM service.
   Future<String> request(String requestString);
 }
 
 
 class HttpRequestManager extends RequestManager {
   Future<String> request(String requestString) {
     return HttpRequest.getString(prefix + requestString);
   }
 }