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, 0 insertions, 76 deletions

diff --git a/scripts/publicqueuehandler.php b/scripts/publicqueuehandler.php
deleted file mode 100755
index 50a11bcba..000000000
--- a/scripts/publicqueuehandler.php
+++ /dev/null
@@ -1,76 +0,0 @@
-#!/usr/bin/env php
-<?php
-/*
- * StatusNet - the distributed open-source microblogging tool
- * Copyright (C) 2008, 2009, StatusNet, Inc.
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Affero General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU Affero General Public License for more details.
- *
- * You should have received a copy of the GNU Affero General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-
-define('INSTALLDIR', realpath(dirname(__FILE__) . '/..'));
-
-$shortoptions = 'i::';
-$longoptions = array('id::');
-
-$helptext = <<<END_OF_PUBLIC_HELP
-Daemon script for pushing new notices to public XMPP subscribers.
-
-    -i --id           Identity (default none)
-
-END_OF_PUBLIC_HELP;
-
-require_once INSTALLDIR.'/scripts/commandline.inc';
-
-require_once INSTALLDIR . '/lib/jabber.php';
-require_once INSTALLDIR . '/lib/xmppqueuehandler.php';
-
-class PublicQueueHandler extends XmppQueueHandler
-{
-
-    function transport()
-    {
-        return 'public';
-    }
-
-    function handle_notice($notice)
-    {
-        try {
-            return jabber_public_notice($notice);
-        } catch (XMPPHP_Exception $e) {
-            $this->log(LOG_ERR, "Got an XMPPHP_Exception: " . $e->getMessage());
-            die($e->getMessage());
-        }
-    }
-}
-
-// Abort immediately if xmpp is not enabled, otherwise the daemon chews up
-// lots of CPU trying to connect to unconfigured servers
-if (common_config('xmpp','enabled')==false) {
-    print "Aborting daemon - xmpp is disabled\n";
-    exit();
-}
-
-if (have_option('i')) {
-    $id = get_option_value('i');
-} else if (have_option('--id')) {
-    $id = get_option_value('--id');
-} else if (count($args) > 0) {
-    $id = $args[0];
-} else {
-    $id = null;
-}
-
-$handler = new PublicQueueHandler($id);
-
-$handler->runOnce();