Major refactoring of queue handlers to support running multiple sites in one daemon.

Key changes:
* Initialization code moved from common.php to StatusNet class;
  can now switch configurations during runtime.
* As a consequence, configuration files must now be idempotent...
  Be careful with constant, function or class definitions.
* Control structure for daemons/QueueManager/QueueHandler has been refactored;
  the run loop is now managed by IoMaster run via scripts/queuedaemon.php
  IoManager subclasses are woken to handle socket input or polling, and may
  cover multiple sites.
* Plugins can implement notice queue handlers more easily by registering a
  QueueHandler class; no more need to add a daemon.

The new QueueDaemon runs from scripts/queuedaemon.php:

* This replaces most of the old *handler.php scripts; they've been refactored
  to the bare handler classes.
* Spawns multiple child processes to spread load; defaults to CPU count on
  Linux and Mac OS X systems, or override with --threads=N
* When multithreaded, child processes are automatically respawned on failure.
* Threads gracefully shut down and restart when passing a soft memory limit
  (defaults to 90% of memory_limit), limiting damage from memory leaks.
* Support for UDP-based monitoring: http://www.gitorious.org/snqmon

Rough control flow diagram:
QueueDaemon -> IoMaster -> IoManager
                           QueueManager [listen or poll] -> QueueHandler
                           XmppManager [ping & keepalive]
                           XmppConfirmManager [poll updates]

Todo:

* Respawning features not currently available running single-threaded.
* When running single-site, configuration changes aren't picked up.
* New sites or config changes affecting queue subscriptions are not yet
  handled without a daemon restart.
* SNMP monitoring output to integrate with general tools (nagios, ganglia)
* Convert XMPP confirmation message sends to use stomp queue instead of polling
* Convert xmppdaemon.php to IoManager?
* Convert Twitter status, friends import polling daemons to IoManager
* Clean up some error reporting and failure modes
* May need to adjust queue priorities for best perf in backlog/flood cases

Detailed code history available in my daemon-work branch:
http://www.gitorious.org/~brion/statusnet/brion-fixes/commits/daemon-work

1 files changed, 1 insertions, 10 deletions

diff --git a/scripts/getvaliddaemons.php b/scripts/getvaliddaemons.php
index 99ad41b37..a332e06b5 100755
--- a/scripts/getvaliddaemons.php
+++ b/scripts/getvaliddaemons.php
@@ -37,19 +37,10 @@ require_once INSTALLDIR.'/scripts/commandline.inc';
 
 $daemons = array();
 
-$daemons[] = INSTALLDIR.'/scripts/pluginqueuehandler.php';
-$daemons[] = INSTALLDIR.'/scripts/ombqueuehandler.php';
-$daemons[] = INSTALLDIR.'/scripts/pingqueuehandler.php';
+$daemons[] = INSTALLDIR.'/scripts/queuedaemon.php';
 
 if(common_config('xmpp','enabled')) {
     $daemons[] = INSTALLDIR.'/scripts/xmppdaemon.php';
-    $daemons[] = INSTALLDIR.'/scripts/jabberqueuehandler.php';
-    $daemons[] = INSTALLDIR.'/scripts/publicqueuehandler.php';
-    $daemons[] = INSTALLDIR.'/scripts/xmppconfirmhandler.php';
-}
-
-if (common_config('sms', 'enabled')) {
-    $daemons[] = INSTALLDIR.'/scripts/smsqueuehandler.php';
 }
 
 if (Event::handle('GetValidDaemons', array(&$daemons))) {