Catch errors that may occur whilst receiving data from the Aphlict server.

Summary: Ref T4324. Currently, if the `AphlictMaster` receives dodgy data from the Aphlict server (invalid JSON, for example) then a syntax error will be thrown and the `AphlictMaster` will die. Instead, catch errors and raise a notification.

Test Plan: {F163466}

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: epriestley, Korvin

Maniphest Tasks: T4324

Differential Revision: https://secure.phabricator.com/D9380

support/aphlict/client/src/Aphlict.as

@@ -31,6 +31,10 @@ package {
       ExternalInterface.call('JX.Aphlict.didReceiveEvent', type, object);
     }
 
+    protected function error(error:Error):void {
+      this.externalInvoke('error', error.toString());
+    }
+
     protected function log(message:String):void {
       this.externalInvoke('log', message);
     }

support/aphlict/client/src/AphlictMaster.as

@@ -131,6 +131,7 @@ package {
     }
 
     private function didReceiveSocket(event:Event):void {
+      try {
         var b:ByteArray = this.readBuffer;
         this.socket.readBytes(b, b.length);
 
@@ -159,6 +160,9 @@ package {
             break;
           }
         } while (true);
+      } catch (err:Error) {
+        this.error(err);
+      }
     }
 
   }

webroot/rsrc/js/application/aphlict/behavior-aphlict-listen.js

@@ -24,8 +24,20 @@ JX.behavior('aphlict-listen', function(config) {
   // Respond to a notification from the Aphlict notification server. We send
   // a request to Phabricator to get notification details.
   function onaphlictmessage(type, message) {
-    if (type == 'receive') {
-      var routable = new JX.Request('/notification/individual/', onnotification)
+    switch (type) {
+      case 'error':
+        new JX.Notification()
+          .setContent('(Aphlict) ' + message)
+          .alterClassName('jx-notification-error', true)
+          .show();
+        break;
+
+      case 'receive':
+        var routable = new JX.Request(
+          '/notification/individual/',
+          onnotification);
+
+        routable
           .addData({key: message.key})
           .getRoutable();
 
@@ -34,8 +46,10 @@ JX.behavior('aphlict-listen', function(config) {
           .setPriority(250);
 
         JX.Router.getInstance().queue(routable);
-    } else if (__DEV__) {
-      if (config.debug) {
+        break;
+
+      default:
+        if (__DEV__ && config.debug) {
           var details = message ? JX.JSON.stringify(message) : '';
 
           new JX.Notification()
@@ -63,8 +77,7 @@ JX.behavior('aphlict-listen', function(config) {
 
     // If the notification affected an object on this page, show a
     // permanent reload notification if we aren't already.
-    if ((response.primaryObjectPHID in config.pageObjects) &&
-        !showing_reload) {
+    if ((response.primaryObjectPHID in config.pageObjects) && !showing_reload) {
       var reload = new JX.Notification()
         .setContent('Page updated, click to reload.')
         .alterClassName('jx-notification-alert', true)