Modify the Aphlict server to transmit messages instead of broadcasting them.

Summary: Ref T4324. Ref T5284. This adds server-side support for keeping track of a set of PHIDs that the Aphlict clients have subscribed to. Instead of broadcasting a notification to all clients (after which the clients can poll `/notification/individual` in order to determine whether or not they are interested in the notification), transmit notifications only to clients that have subscribed to a PHID that is relevant to the notification.

Test Plan:
I opened up two clients on the same host (incognito tabs in Chrome). Here is the output from the server:

```
> sudo ./bin/aphlict debug
Starting Aphlict server in foreground...
Launching server:

    $ 'nodejs' '/usr/src/phabricator/src/applications/aphlict/management/../../../../support/aphlict/server/aphlict_server.js' --port='22280' --admin='22281' --host='localhost' --user='aphlict'

[Wed Jun 11 2014 19:10:27 GMT+0000 (UTC)] Started Server (PID 4546)
[Wed Jun 11 2014 19:10:36 GMT+0000 (UTC)] <FlashPolicy> Policy Request From ::ffff:192.168.1.1
[Wed Jun 11 2014 19:10:37 GMT+0000 (UTC)] <Listener/1> Connected from ::ffff:192.168.1.1
[Wed Jun 11 2014 19:10:37 GMT+0000 (UTC)] <Listener/1> Received data: {"command":"subscribe","data":["PHID-USER-cb5af6p4oepy5tlgqypi"]}
[Wed Jun 11 2014 19:10:37 GMT+0000 (UTC)] <Listener/1> Subscribed to: ["PHID-USER-cb5af6p4oepy5tlgqypi"]
[Wed Jun 11 2014 19:10:39 GMT+0000 (UTC)] <Listener/1> Received data: {"command":"subscribe","data":["PHID-USER-kfohe3ca5oe6ygykmioq"]}
[Wed Jun 11 2014 19:10:39 GMT+0000 (UTC)] <Listener/1> Subscribed to: ["PHID-USER-kfohe3ca5oe6ygykmioq"]
[Wed Jun 11 2014 19:10:42 GMT+0000 (UTC)] notification: {"key":"6023751084283587681","type":"notification","subscribers":["PHID-USER-cb5af6p4oepy5tlgqypi"]}
[Wed Jun 11 2014 19:10:42 GMT+0000 (UTC)] <Listener/1> Wrote Message
```

I verified (using the "Network" tab in Chrome) that an AJAX request to `/notification/individual/` was only made in the tab belonging to the user that triggered the test notification.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: epriestley, Korvin

Maniphest Tasks: T5284, T4324

Differential Revision: https://secure.phabricator.com/D9458

resources/celerity/map.php

@@ -8,7 +8,7 @@ return array(
   'names' =>
   array(
     'core.pkg.css' => 'd82d2f53',
-    'core.pkg.js' => '88ca2043',
+    'core.pkg.js' => '4af4aa9d',
     'darkconsole.pkg.js' => 'ca8671ce',
     'differential.pkg.css' => '4a93db37',
     'differential.pkg.js' => 'eca39a2c',
@@ -334,9 +334,9 @@ return array(
     'rsrc/image/texture/table_header.png' => '5c433037',
     'rsrc/image/texture/table_header_hover.png' => '038ec3b9',
     'rsrc/image/texture/table_header_tall.png' => 'd56b434f',
-    'rsrc/js/application/aphlict/Aphlict.js' => '493665ee',
+    'rsrc/js/application/aphlict/Aphlict.js' => '08be8878',
     'rsrc/js/application/aphlict/behavior-aphlict-dropdown.js' => '2a2dba85',
-    'rsrc/js/application/aphlict/behavior-aphlict-listen.js' => '027c888a',
+    'rsrc/js/application/aphlict/behavior-aphlict-listen.js' => 'acda9f51',
     'rsrc/js/application/auth/behavior-persona-login.js' => '9414ff18',
     'rsrc/js/application/config/behavior-reorder-fields.js' => '938aed89',
     'rsrc/js/application/conpherence/behavior-menu.js' => '7ee23816',
@@ -477,7 +477,7 @@ return array(
     'rsrc/js/phuix/PHUIXActionListView.js' => 'b5c256b8',
     'rsrc/js/phuix/PHUIXActionView.js' => '6e8cefa4',
     'rsrc/js/phuix/PHUIXDropdownMenu.js' => 'bd4c8dca',
-    'rsrc/swf/aphlict.swf' => 'f45c3edc',
+    'rsrc/swf/aphlict.swf' => 'd9bca85d',
   ),
   'symbols' =>
   array(
@@ -525,10 +525,10 @@ return array(
     'herald-rule-editor' => '22d2966a',
     'herald-test-css' => '778b008e',
     'inline-comment-summary-css' => '8cfd34e8',
-    'javelin-aphlict' => '493665ee',
+    'javelin-aphlict' => '08be8878',
     'javelin-behavior' => '8a3ed18b',
     'javelin-behavior-aphlict-dropdown' => '2a2dba85',
-    'javelin-behavior-aphlict-listen' => '027c888a',
+    'javelin-behavior-aphlict-listen' => 'acda9f51',
     'javelin-behavior-aphront-basic-tokenizer' => 'b3a4b884',
     'javelin-behavior-aphront-crop' => 'b98fc918',
     'javelin-behavior-aphront-drag-and-drop-textarea' => '4a11ea9c',
@@ -819,18 +819,6 @@ return array(
       4 => 'javelin-vector',
       5 => 'differential-inline-comment-editor',
     ),
-    '027c888a' =>
-    array(
-      0 => 'javelin-behavior',
-      1 => 'javelin-aphlict',
-      2 => 'javelin-stratcom',
-      3 => 'javelin-request',
-      4 => 'javelin-uri',
-      5 => 'javelin-dom',
-      6 => 'javelin-json',
-      7 => 'javelin-router',
-      8 => 'phabricator-notification',
-    ),
     '029a133d' =>
     array(
       0 => 'aphront-dialog-view-css',
@@ -865,6 +853,11 @@ return array(
       3 => 'javelin-vector',
       4 => 'javelin-stratcom',
     ),
+    '08be8878' =>
+    array(
+      0 => 'javelin-install',
+      1 => 'javelin-util',
+    ),
     '08e56a4e' =>
     array(
       0 => 'javelin-install',
@@ -1153,11 +1146,6 @@ return array(
       2 => 'javelin-stratcom',
       3 => 'phabricator-tooltip',
     ),
-    '493665ee' =>
-    array(
-      0 => 'javelin-install',
-      1 => 'javelin-util',
-    ),
     '4a11ea9c' =>
     array(
       0 => 'javelin-behavior',
@@ -1620,6 +1608,18 @@ return array(
       1 => 'javelin-dom',
       2 => 'javelin-stratcom',
     ),
+    'acda9f51' =>
+    array(
+      0 => 'javelin-behavior',
+      1 => 'javelin-aphlict',
+      2 => 'javelin-stratcom',
+      3 => 'javelin-request',
+      4 => 'javelin-uri',
+      5 => 'javelin-dom',
+      6 => 'javelin-json',
+      7 => 'javelin-router',
+      8 => 'phabricator-notification',
+    ),
     'ad7a69ca' =>
     array(
       0 => 'javelin-install',

src/view/page/PhabricatorStandardPageView.php

@@ -376,6 +376,12 @@ final class PhabricatorStandardPageView extends PhabricatorBarePageView {
         $swf_uri = $response->getURI($map, 'rsrc/swf/aphlict.swf');
 
         $enable_debug = PhabricatorEnv::getEnvConfig('notification.debug');
+
+        $subscriptions = $this->pageObjects;
+        if ($user) {
+          $subscriptions[] = $user->getPHID();
+        }
+
         Javelin::initBehavior(
           'aphlict-listen',
           array(
@@ -386,6 +392,7 @@ final class PhabricatorStandardPageView extends PhabricatorBarePageView {
             'debug'         => $enable_debug,
             'swfURI'        => $swf_uri,
             'pageObjects'   => array_fill_keys($this->pageObjects, true),
+            'subscriptions' => $subscriptions,
           ));
 
         $tail[] = phutil_tag(

support/aphlict/client/src/AphlictClient.as

@@ -2,6 +2,7 @@ package {
 
   import flash.events.TimerEvent;
   import flash.external.ExternalInterface;
+  import flash.utils.Dictionary;
   import flash.utils.Timer;
 
 
@@ -43,7 +44,11 @@ package {
         {});
     }
 
-    public function externalConnect(server:String, port:Number):void {
+    public function externalConnect(
+      server:String,
+      port:Number,
+      subscriptions:Array):void {
+
       this.externalInvoke('connect');
 
       this.remoteServer = server;
@@ -56,6 +61,10 @@ package {
       this.timer.addEventListener(TimerEvent.TIMER, this.keepalive);
 
       this.connectToMaster();
+
+      // Send subscriptions to master.
+      this.log('Sending subscriptions to master.');
+      this.send.send('aphlict_master', 'subscribe', this.client, subscriptions);
     }
 
     /**

support/aphlict/client/src/AphlictMaster.as

@@ -40,6 +40,11 @@ package {
      */
     private var remotePort:Number;
 
+    /**
+     * A dictionary mapping PHID to subscribed clients.
+     */
+    private var subscriptions:Dictionary;
+
     private var socket:Socket;
     private var readBuffer:ByteArray;
 
@@ -50,12 +55,13 @@ package {
       this.remoteServer = server;
       this.remotePort   = port;
 
+      this.clients = new Dictionary();
+      this.subscriptions = new Dictionary();
+
       // Connect to the Aphlict Server.
       this.recv.connect('aphlict_master');
       this.connectToServer();
 
-      this.clients = new Dictionary();
-
       // Start a timer and regularly purge dead clients.
       this.timer = new Timer(AphlictMaster.PURGE_INTERVAL);
       this.timer.addEventListener(TimerEvent.TIMER, this.purgeClients);
@@ -116,6 +122,16 @@ package {
 
     private function didConnectSocket(event:Event):void {
       this.externalInvoke('connected');
+
+      // Send subscriptions
+      var phids = new Array();
+      for (var phid:String in this.subscriptions) {
+        phids.push(phid);
+      }
+
+      if (phids.length) {
+        this.sendSubscribeCommand(phids);
+      }
     }
 
     private function didCloseSocket(event:Event):void {
@@ -130,6 +146,69 @@ package {
       this.externalInvoke('error', event.text);
     }
 
+    public function subscribe(client:String, phids:Array):void {
+      var newPHIDs = new Array();
+
+      for (var i:String in phids) {
+        var phid = phids[i];
+        if (!this.subscriptions[phid]) {
+          this.subscriptions[phid] = new Dictionary();
+          newPHIDs.push(phid);
+        }
+        this.subscriptions[phid][client] = true;
+      }
+
+      if (newPHIDs.length) {
+        this.sendSubscribeCommand(newPHIDs);
+      }
+    }
+
+    public function unsubscribe(client:String, phids:Array):void {
+      var oldPHIDs = new Array();
+
+      for (var phid:String in phids) {
+        if (!this.subscriptions[phid]) {
+          continue;
+        }
+
+        delete this.subscriptions[phid][client];
+
+        var empty = true;
+        for (var key:String in this.subscriptions[phid]) {
+          empty = false;
+        }
+
+        if (empty) {
+          delete this.subscriptions[phid];
+          oldPHIDs.push(phid);
+        }
+      }
+
+      if (oldPHIDs.length) {
+        this.sendUnsubscribeCommand(oldPHIDs);
+      }
+    }
+
+    private function sendSubscribeCommand(phids:Array):void {
+      var msg:Dictionary = new Dictionary();
+      msg['command'] = 'subscribe';
+      msg['data'] = phids;
+
+      this.log('Sending subscribe command to server.');
+      this.socket.writeUTF(vegas.strings.JSON.serialize(msg));
+      this.socket.flush();
+    }
+
+    private function sendUnsubscribeCommand(phids:Array):void {
+      var msg:Dictionary = new Dictionary();
+      msg['command'] = 'unsubscribe';
+      msg['data'] = phids;
+
+      this.log('Sending subscribe command to server.');
+      this.socket.writeUTF(vegas.strings.JSON.serialize(msg));
+      this.socket.flush();
+    }
+
     private function didReceiveSocket(event:Event):void {
       try {
         var b:ByteArray = this.readBuffer;
@@ -153,9 +232,23 @@ package {
 
             // Send the message to all clients.
             for (var client:String in this.clients) {
+              var subscribed = false;
+
+              for (var i:String in data.subscribers) {
+                var phid = data.subscribers[i];
+
+                if (this.subscriptions[phid] &&
+                    this.subscriptions[phid][client]) {
+                  subscribed = true;
+                  break;
+                }
+              }
+
+              if (subscribed) {
                 this.log('Sending message to client: ' + client);
                 this.send.send(client, 'receiveMessage', data);
               }
+            }
           } else {
             break;
           }

support/aphlict/server/aphlict_server.js

@@ -83,6 +83,61 @@ var send_server = net.createServer(function(socket) {
     listener.getDescription(),
     socket.remoteAddress);
 
+  var buffer = new Buffer([]);
+  var length = 0;
+
+  socket.on('data', function(data) {
+    buffer = Buffer.concat([buffer, new Buffer(data)]);
+
+    while (buffer.length) {
+      if (!length) {
+        length = buffer.readUInt16BE(0);
+        buffer = buffer.slice(2);
+      }
+
+      if (buffer.length < length) {
+        // We need to wait for the rest of the data.
+        return;
+      }
+
+      var message;
+      try {
+        message = JSON.parse(buffer.toString('utf8', 0, length));
+      } catch (err) {
+        debug.log('<%s> Received invalid data.', listener.getDescription());
+        continue;
+      } finally {
+        buffer = buffer.slice(length);
+        length = 0;
+      }
+
+      debug.log('<%s> Received data: %s',
+        listener.getDescription(),
+        JSON.stringify(message));
+
+      switch (message.command) {
+        case 'subscribe':
+          debug.log(
+            '<%s> Subscribed to: %s',
+            listener.getDescription(),
+            JSON.stringify(message.data));
+          listener.subscribe(message.data);
+          break;
+
+        case 'unsubscribe':
+          debug.log(
+            '<%s> Unsubscribed from: %s',
+            listener.getDescription(),
+            JSON.stringify(message.data));
+          listener.unsubscribe(message.data);
+          break;
+
+        default:
+          debug.log('<s> Unrecognized command.', listener.getDescription());
+      }
+    }
+  });
+
   socket.on('close', function() {
     clients.removeListener(listener);
     debug.log('<%s> Disconnected', listener.getDescription());
@@ -122,7 +177,7 @@ var receive_server = http.createServer(function(request, response) {
 
         debug.log('notification: ' + JSON.stringify(msg));
         ++messages_in;
-        broadcast(msg);
+        transmit(msg);
 
         response.writeHead(200, {'Content-Type': 'text/plain'});
       } catch (err) {
@@ -161,12 +216,16 @@ var receive_server = http.createServer(function(request, response) {
 
 }).listen(config.admin, config.host);
 
-function broadcast(data) {
-  var listeners = clients.getListeners();
-  for (var id in listeners) {
-    var listener = listeners[id];
+function transmit(msg) {
+  var listeners = clients.getListeners().filter(function(client) {
+    return client.isSubscribedToAny(msg.subscribers);
+  });
+
+  for (var i = 0; i < listeners.length; i++) {
+    var listener = listeners[i];
+
     try {
-      listener.writeMessage(data);
+      listener.writeMessage(msg);
 
       ++messages_out;
       debug.log('<%s> Wrote Message', listener.getDescription());

support/aphlict/server/lib/AphlictListener.js

@@ -9,11 +9,37 @@ JX.install('AphlictListener', {
   members: {
     _id: null,
     _socket: null,
+    _subscriptions: {},
 
     getID: function() {
       return this._id;
     },
 
+    subscribe: function(phids) {
+      for (var i = 0; i < phids.length; i++) {
+        var phid = phids[i];
+        this._subscriptions[phid] = true;
+      }
+
+      return this;
+    },
+
+    unsubscribe: function(phids) {
+      for (var i = 0; i < phids.length; i++) {
+        var phid = phids[i];
+        delete this._subscriptions[phid];
+      }
+
+      return this;
+    },
+
+    isSubscribedToAny: function(phids) {
+      var intersection = phids.filter(function(phid) {
+        return phid in this._subscriptions;
+      }, this);
+      return intersection.length > 0;
+    },
+
     getSocket: function() {
       return this._socket;
     },

support/aphlict/server/lib/AphlictListenerList.js

@@ -31,7 +31,14 @@ JX.install('AphlictListenerList', {
     },
 
     getListeners: function() {
-      return this._listeners;
+      var keys = Object.keys(this._listeners);
+      var listeners = [];
+
+      for (var i = 0; i < keys.length; i++) {
+        listeners.push(this._listeners[keys[i]]);
+      }
+
+      return listeners;
     },
 
     getActiveListenerCount: function() {

webroot/rsrc/js/application/aphlict/Aphlict.js

@@ -25,7 +25,7 @@
  */
 JX.install('Aphlict', {
 
-  construct : function(id, server, port) {
+  construct : function(id, server, port, subscriptions) {
     if (__DEV__) {
       if (JX.Aphlict._instance) {
         JX.$E('Aphlict object is sort of a singleton..!');
@@ -36,6 +36,7 @@ JX.install('Aphlict', {
 
     this._server = server;
     this._port = port;
+    this._subscriptions = subscriptions;
 
     // Flash puts its "objects" into global scope in an inconsistent way,
     // because it was written in like 1816 when globals were awesome and IE4
@@ -48,8 +49,12 @@ JX.install('Aphlict', {
   members : {
     _server : null,
     _port : null,
+    _subscriptions : null,
     start : function() {
-      this._flashContainer.connect(this._server, this._port);
+      this._flashContainer.connect(
+        this._server,
+        this._port,
+        this._subscriptions);
     }
   },
 

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

@@ -16,7 +16,13 @@ JX.behavior('aphlict-listen', function(config) {
   var showing_reload = false;
 
   function onready() {
-    var client = new JX.Aphlict(config.id, config.server, config.port)
+    var client = new JX.Aphlict(
+      config.id,
+      config.server,
+      config.port,
+      config.subscriptions);
+
+    client
       .setHandler(onaphlictmessage)
       .start();
   }