Don't abuse state change function for messages

This doesn't even work anymore since we fixed it to ignore changes
to the current state. Add a separate callback for notifications
instead.

app/ui.js

@@ -338,6 +338,7 @@ var UI;
         initRFB: function() {
             try {
                 UI.rfb = new RFB({'target': document.getElementById('noVNC_canvas'),
+                                  'onNotification': UI.notification,
                                   'onUpdateState': UI.updateState,
                                   'onPasswordRequired': UI.passwordRequired,
                                   'onXvpInit': UI.updateXvpButton,
@@ -486,6 +487,10 @@ var UI;
             document.getElementById('noVNC_status').classList.remove("noVNC_open");
         },
 
+        notification: function (rfb, msg, level, options) {
+            UI.showStatus(msg, level);
+        },
+
         activateControlbar: function(event) {
             clearTimeout(UI.idleControlbarTimeout);
             // We manipulate the anchor instead of the actual control

core/rfb.js

@@ -158,6 +158,7 @@
 
         // Callback functions
         'onUpdateState': function () { },       // onUpdateState(rfb, state, oldstate, statusMsg): state update/change
+        'onNotification': function () { },      // onNotification(rfb, msg, level, options): notification for UI
         'onPasswordRequired': function () { },  // onPasswordRequired(rfb, msg): VNC password is required
         'onClipboard': function () { },         // onClipboard(rfb, text): RFB clipboard contents received
         'onBell': function () { },              // onBell(rfb): RFB Bell message received
@@ -535,6 +536,33 @@
             return false;
         },
 
+        /*
+         * Send a notification to the UI. Valid levels are:
+         *   'normal'|'warn'|'error'
+         *
+         *   NOTE: Options could be added in the future.
+         *   NOTE: If this function is called multiple times, remember that the
+         *         interface could be only showing the latest notification.
+         */
+        _notification: function(msg, level, options) {
+            switch (level) {
+                case 'normal':
+                case 'warn':
+                case 'error':
+                    Util.Debug("Notification[" + level + "]:" + msg);
+                    break;
+                default:
+                    Util.Error("Invalid notification level: " + level);
+                    return;
+            }
+
+            if (options) {
+                this._onNotification(this, msg, level, options);
+            } else {
+                this._onNotification(this, msg, level);
+            }
+        },
+
         _handle_message: function () {
             if (this._sock.rQlen() === 0) {
                 Util.Warn("handle_message called on an empty receive queue");
@@ -1130,7 +1158,8 @@
 
             switch (xvp_msg) {
                 case 0:  // XVP_FAIL
-                    this._updateState(this._rfb_state, "Operation Failed");
+                    Util.Error("Operation Failed");
+                    this._notification("XVP Operation Failed", 'error');
                     break;
                 case 1:  // XVP_INIT
                     this._rfb_xvp_ver = xvp_ver;
@@ -1322,6 +1351,7 @@
 
         // Callback functions
         ['onUpdateState', 'rw', 'func'],        // onUpdateState(rfb, state, oldstate, statusMsg): RFB state update/change
+        ['onNotification', 'rw', 'func'],       // onNotification(rfb, msg, level, options): notification for the UI
         ['onPasswordRequired', 'rw', 'func'],   // onPasswordRequired(rfb, msg): VNC password is required
         ['onClipboard', 'rw', 'func'],          // onClipboard(rfb, text): RFB clipboard contents received
         ['onBell', 'rw', 'func'],               // onBell(rfb): RFB Bell message received
@@ -2275,7 +2305,8 @@
                     msg = "Unknown reason";
                     break;
                 }
-                Util.Info("Server did not accept the resize request: " + msg);
+                this._notification("Server did not accept the resize request: "
+                                   + msg, 'normal');
                 return true;
             }
 

tests/test.rfb.js

@@ -338,6 +338,28 @@ describe('Remote Frame Buffer Protocol Client', function() {
                 expect(client._disconnTimer).to.be.null;
             });
         });
+
+        describe('#_notification', function () {
+            var client;
+            beforeEach(function () { client = make_rfb(); });
+
+            it('should call the notification callback', function () {
+                client.set_onNotification(sinon.spy());
+                client._notification('notify!', 'warn');
+                var spy = client.get_onNotification();
+                expect(spy).to.have.been.calledOnce;
+                expect(spy.args[0][1]).to.equal('notify!');
+                expect(spy.args[0][2]).to.equal('warn');
+            });
+
+            it('should not call the notification callback when level is invalid', function () {
+                client.set_onNotification(sinon.spy());
+                client._notification('notify!', 'invalid');
+                var spy = client.get_onNotification();
+                expect(spy).to.not.have.been.called;
+            });
+        });
+
     });
 
     describe('Page States', function () {
@@ -1730,11 +1752,12 @@ describe('Remote Frame Buffer Protocol Client', function() {
                 client._fb_height = 32;
             });
 
-            it('should call updateState with a message on XVP_FAIL, but keep the same state', function () {
-                client._updateState = sinon.spy();
+            it('should send a notification on XVP_FAIL', function () {
+                client.set_onNotification(sinon.spy());
                 client._sock._websocket._receive_data(new Uint8Array([250, 0, 10, 0]));
-                expect(client._updateState).to.have.been.calledOnce;
-                expect(client._updateState).to.have.been.calledWith('normal', 'Operation Failed');
+                var spy = client.get_onNotification();
+                expect(spy).to.have.been.calledOnce;
+                expect(spy.args[0][1]).to.equal('XVP Operation Failed');
             });
 
             it('should set the XVP version and fire the callback with the version on XVP_INIT', function () {

vnc_auto.html

@@ -161,6 +161,9 @@
                 s.innerHTML = msg;
             }
         }
+        function notification(rfb, msg, level, options) {
+            $D('noVNC_status').innerHTML = msg;
+        }
 
         window.onresize = function () {
             // When the window has been resized, wait until the size remains
@@ -236,6 +239,7 @@
                                'local_cursor': WebUtil.getConfigVar('cursor', true),
                                'shared':       WebUtil.getConfigVar('shared', true),
                                'view_only':    WebUtil.getConfigVar('view_only', false),
+                               'onNotification:  notification,
                                'onUpdateState':  updateState,
                                'onXvpInit':    xvpInit,
                                'onPasswordRequired':  passwordRequired,