From 03200235b1a1bba56c24e1bb659023ba24265eb3 Mon Sep 17 00:00:00 2001
From: Evan Prodromou <evan@controlyourself.ca>
Date: Thu, 9 Jul 2009 12:09:20 -0400
Subject: [PATCH] use select() to bring down xmpp latency

---
 lib/jabber.php            | 10 ++++-
 lib/queuehandler.php      |  5 +++
 lib/stompqueuemanager.php | 77 +++++++++++++++++++++++++++------------
 lib/xmppqueuehandler.php  |  5 +++
 4 files changed, 73 insertions(+), 24 deletions(-)

diff --git a/lib/jabber.php b/lib/jabber.php
index 7d584ad016..e15076160f 100644
--- a/lib/jabber.php
+++ b/lib/jabber.php
@@ -77,6 +77,14 @@ function jabber_daemon_address()
     return common_config('xmpp', 'user') . '@' . common_config('xmpp', 'server');
 }
 
+class Sharing_XMPP extends XMPPHP_XMPP
+{
+    function getSocket()
+    {
+        return $this->socket;
+    }
+}
+
 /**
  * connect the configured Jabber account to the configured server
  *
@@ -89,7 +97,7 @@ function jabber_connect($resource=null)
 {
     static $conn = null;
     if (!$conn) {
-        $conn = new XMPPHP_XMPP(common_config('xmpp', 'host') ?
+        $conn = new Sharing_XMPP(common_config('xmpp', 'host') ?
                                 common_config('xmpp', 'host') :
                                 common_config('xmpp', 'server'),
                                 common_config('xmpp', 'port'),
diff --git a/lib/queuehandler.php b/lib/queuehandler.php
index c0f38f4e35..c2ff10f32f 100644
--- a/lib/queuehandler.php
+++ b/lib/queuehandler.php
@@ -115,5 +115,10 @@ class QueueHandler extends Daemon
     {
         common_log($level, $this->class_name() . ' ('. $this->get_id() .'): '.$msg);
     }
+
+    function getSockets()
+    {
+        return array();
+    }
 }
 
diff --git a/lib/stompqueuemanager.php b/lib/stompqueuemanager.php
index 4d89806f8d..7da7c00110 100644
--- a/lib/stompqueuemanager.php
+++ b/lib/stompqueuemanager.php
@@ -30,6 +30,14 @@
 
 require_once 'Stomp.php';
 
+class LiberalStomp extends Stomp
+{
+    function getSocket()
+    {
+        return $this->_socket;
+    }
+}
+
 class StompQueueManager
 {
     var $server = null;
@@ -50,7 +58,7 @@ class StompQueueManager
     {
         if (empty($this->con)) {
             $this->_log(LOG_INFO, "Connecting to '$this->server' as '$this->username'...");
-            $this->con = new Stomp($this->server);
+            $this->con = new LiberalStomp($this->server);
 
             if ($this->con->connect($this->username, $this->password)) {
                 $this->_log(LOG_INFO, "Connected.");
@@ -94,34 +102,57 @@ class StompQueueManager
 
         while (true) {
 
-            $frame = $this->con->readFrame();
+            // Wait for something on one of our sockets
 
-            if (!empty($frame)) {
-                $notice = Notice::staticGet('id', $frame->body);
+            $stompsock = $this->con->getSocket();
 
-                if (empty($notice)) {
-                    $this->_log(LOG_WARNING, 'Got ID '. $frame->body .' for non-existent notice in queue '. $queue);
-                    $this->con->ack($frame);
-                } else {
-                    if ($handler->handle_notice($notice)) {
-                        $this->_log(LOG_INFO, 'Successfully handled notice '. $notice->id .' posted at ' . $frame->headers['created'] . ' in queue '. $queue);
+            $handsocks = $handler->getSockets();
+
+            $this->_log(LOG_DEBUG, "Got ".count($handsocks)." sockets from handler.");
+            $this->_log(LOG_DEBUG, print_r($handsocks, true));
+
+            $socks = array_merge(array($stompsock), $handsocks);
+
+            $read = $socks;
+            $write = array();
+            $except = array();
+
+            $this->_log(LOG_DEBUG, "Starting select");
+            $ready = stream_select($read, $write, $except, $handler->timeout(), 0);
+            $this->_log(LOG_DEBUG, "Finished select with value '$ready'");
+
+            if (!$ready || $read[0] !== $stompsock) {
+                $handler->idle(QUEUE_HANDLER_MISS_IDLE);
+            } else {
+                $frame = $this->con->readFrame();
+
+                if (!empty($frame)) {
+                    $notice = Notice::staticGet('id', $frame->body);
+
+                    if (empty($notice)) {
+                        $this->_log(LOG_WARNING, 'Got ID '. $frame->body .' for non-existent notice in queue '. $queue);
                         $this->con->ack($frame);
                     } else {
-                        $this->_log(LOG_WARNING, 'Failed handling notice '. $notice->id .' posted at ' . $frame->headers['created']  . ' in queue '. $queue);
-                        // FIXME we probably shouldn't have to do
-                        // this kind of queue management ourselves
-                        $this->con->ack($frame);
-                        $this->enqueue($notice, $queue);
+                        if ($handler->handle_notice($notice)) {
+                            $this->_log(LOG_INFO, 'Successfully handled notice '. $notice->id .' posted at ' . $frame->headers['created'] . ' in queue '. $queue);
+                            $this->con->ack($frame);
+                        } else {
+                            $this->_log(LOG_WARNING, 'Failed handling notice '. $notice->id .' posted at ' . $frame->headers['created']  . ' in queue '. $queue);
+                            // FIXME we probably shouldn't have to do
+                            // this kind of queue management ourselves
+                            $this->con->ack($frame);
+                            $this->enqueue($notice, $queue);
+                        }
+                        unset($notice);
                     }
-                    unset($notice);
+
+                    unset($frame);
+
+                    $handler->idle(QUEUE_HANDLER_HIT_IDLE);
+
+                } else {
+                    $handler->idle(QUEUE_HANDLER_MISS_IDLE);
                 }
-
-                unset($frame);
-
-                $handler->idle(QUEUE_HANDLER_HIT_IDLE);
-
-            } else {
-                $handler->idle(QUEUE_HANDLER_MISS_IDLE);
             }
         }
 
diff --git a/lib/xmppqueuehandler.php b/lib/xmppqueuehandler.php
index cbcfe5e1c6..77d476c30e 100644
--- a/lib/xmppqueuehandler.php
+++ b/lib/xmppqueuehandler.php
@@ -126,4 +126,9 @@ class XmppQueueHandler extends QueueHandler
             return jabber_daemon_address() . '/' . common_config('xmpp','resource') . 'daemon';
         }
     }
+
+    function getSockets()
+    {
+        return array($this->conn->getSocket());
+    }
 }