Allow Observatory to run as a hosted web service

runtime/bin/vmservice/client/lib/src/app/pane.dart

-// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2014, 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 app;
 
 /// A [Pane] controls the user interface of Observatory. At any given time
 /// one pane will be the current pane. Panes are registered at startup.
 /// When the user navigates within the application, each pane is asked if it
 /// can handle the current location, the first pane to say yes, wins.
 abstract class Pane extends Observable {
@@ skipping 36 matching lines @@
     assert(element != null);
     assert(canVisit(url));
     if (url == '') {
       // Nothing requested.
       return;
     }
     /// Request url from VM and display it.
     app.vm.get(url).then((obj) {
       ServiceObjectViewElement pane = element;
       pane.object = obj;
+    }).catchError((e) {
+      Logger.root.severe('ServiceObjectPane visit error: $e');
     });
   }
 
   /// Catch all.
   bool canVisit(String url) => true;
 }
 
 /// Class tree pane.
 class ClassTreePane extends Pane {
   static const _urlPrefix = 'class-tree/';
@@ skipping 12 matching lines @@
     // ClassTree urls are 'class-tree/isolate-id', chop off prefix, leaving
     // isolate url.
     url = url.substring(_urlPrefix.length);
     /// Request the isolate url.
     app.vm.get(url).then((i) {
       if (element != null) {
         /// Update the pane.
         ClassTreeElement pane = element;
         pane.isolate = i;
       }
+    }).catchError((e) {
+      Logger.root.severe('ClassTreePane visit error: $e');
     });
   }
 
   /// Catch all.
   bool canVisit(String url) => url.startsWith(_urlPrefix);
 }
 
 class ErrorViewPane extends Pane {
   ErrorViewPane(app) : super(app);
 
   void onInstall() {
     if (element == null) {
       /// Lazily create pane.
       element = new Element.tag('service-view');
     }
   }
 
   void visit(String url) {
     assert(element != null);
     assert(canVisit(url));
     (element as ServiceObjectViewElement).object = app.lastErrorOrException;
   }
 
   bool canVisit(String url) => url.startsWith('error/');
 }
 
-/// The observatory application. Instances of this are created and owned
-/// by the observatory_application custom element.
-class ObservatoryApplication extends Observable {
-  final _paneRegistry = new List<Pane>();
-  ServiceObjectPane _serviceObjectPane;
-  Pane _currentPane;
-  @observable final LocationManager locationManager;
-  @observable final VM vm;
-  @observable Isolate isolate;
-  @reflectable final ObservatoryApplicationElement rootElement;
+class VMConnectPane extends Pane {
+  VMConnectPane(app) : super(app);
 
-  @reflectable ServiceObject lastErrorOrException;
-
-  void _initOnce() {
-    _registerPanes();
-    vm.errors.stream.listen(_onError);
-    vm.exceptions.stream.listen(_onException);
-    location = locationManager;
-    locationManager._init(this);
+  void onInstall() {
+    if (element == null) {
+      element = new Element.tag('vm-connect');
+    }
+    assert(element != null);
   }
 
-  void _registerPanes() {
-    if (_serviceObjectPane != null) {
-      // Already done.
-      return;
-    }
-    // Register ClassTreePane.
-    _paneRegistry.add(new ClassTreePane(this));
-    _paneRegistry.add(new ErrorViewPane(this));
-    // Note that ServiceObjectPane must be the last entry in the list as it is
-    // the catch all.
-    _serviceObjectPane = new ServiceObjectPane(this);
-    _paneRegistry.add(_serviceObjectPane);
+  void visit(String url) {
+    assert(element != null);
+    assert(canVisit(url));
   }
 
-  void _onError(ServiceError error) {
-    lastErrorOrException = error;
-    _visit('error/', null);
-  }
-
-  void _onException(ServiceException exception) {
-    lastErrorOrException = exception;
-    _visit('error/', null);
-  }
-
-  void _visit(String url, String args) {
-    // TODO(johnmccutchan): Pass [args] to pane.
-    for (var i = 0; i < _paneRegistry.length; i++) {
-      var pane = _paneRegistry[i];
-      if (pane.canVisit(url)) {
-        _installPane(pane);
-        pane.visit(url);
-        return;
-      }
-    }
-    throw new FallThroughError();
-  }
-
-  /// Set the Observatory application pane.
-  void _installPane(Pane pane) {
-    assert(pane != null);
-    print('Installing $pane');
-    if (_currentPane == pane) {
-      // Already isntalled.
-      return;
-    }
-    if (_currentPane != null) {
-      _currentPane.onUninstall();
-    }
-    pane.onInstall();
-    // Clear children.
-    rootElement.children.clear();
-    // Add new pane.
-    rootElement.children.add(pane.element);
-    // Remember pane.
-    _currentPane = pane;
-  }
-
-  ObservatoryApplication.devtools(this.rootElement) :
-      locationManager = new HashLocationManager(),
-      vm = new DartiumVM() {
-    _initOnce();
-  }
-
-  ObservatoryApplication(this.rootElement) :
-      locationManager = new HashLocationManager(),
-      vm = new HttpVM() {
-    _initOnce();
-  }
+  bool canVisit(String url) => url.startsWith('vm-connect/');
 }
-
-LocationManager location;