274 lines
8.2 KiB
PHP
274 lines
8.2 KiB
PHP
<?php
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/*
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* StatusNet - the distributed open-source microblogging tool
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* Copyright (C) 2008, 2009, StatusNet, Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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if (!defined('STATUSNET') && !defined('LACONICA')) { exit(1); }
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/**
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* XMPP background connection manager for XMPP-using queue handlers,
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* allowing them to send outgoing messages on the right connection.
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*
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* Input is handled during socket select loop, keepalive pings during idle.
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* Any incoming messages will be forwarded to the main XmppDaemon process,
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* which handles direct user interaction.
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*
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* In a multi-site queuedaemon.php run, one connection will be instantiated
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* for each site being handled by the current process that has XMPP enabled.
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*/
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class XmppManager extends IoManager
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{
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protected $site = null;
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protected $pingid = 0;
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protected $lastping = null;
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static protected $singletons = array();
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const PING_INTERVAL = 120;
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/**
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* Fetch the singleton XmppManager for the current site.
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* @return mixed XmppManager, or false if unneeded
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*/
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public static function get()
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{
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if (common_config('xmpp', 'enabled')) {
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$site = common_config('site', 'server');
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if (empty(self::$singletons[$site])) {
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self::$singletons[$site] = new XmppManager();
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}
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return self::$singletons[$site];
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} else {
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return false;
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}
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}
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/**
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* Tell the i/o master we need one instance for each supporting site
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* being handled in this process.
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*/
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public static function multiSite()
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{
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return IoManager::INSTANCE_PER_SITE;
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}
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function __construct()
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{
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$this->site = common_config('site', 'server');
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}
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/**
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* Initialize connection to server.
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* @return boolean true on success
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*/
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public function start($master)
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{
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parent::start($master);
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$this->switchSite();
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require_once "lib/jabber.php";
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# Low priority; we don't want to receive messages
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common_log(LOG_INFO, "INITIALIZE");
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$this->conn = jabber_connect($this->resource());
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if (empty($this->conn)) {
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common_log(LOG_ERR, "Couldn't connect to server.");
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return false;
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}
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$this->conn->addEventHandler('message', 'forward_message', $this);
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$this->conn->addEventHandler('reconnect', 'handle_reconnect', $this);
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$this->conn->setReconnectTimeout(600);
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jabber_send_presence("Send me a message to post a notice", 'available', null, 'available', -1);
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return !is_null($this->conn);
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}
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/**
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* Message pump is triggered on socket input, so we only need an idle()
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* call often enough to trigger our outgoing pings.
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*/
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function timeout()
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{
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return self::PING_INTERVAL;
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}
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/**
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* Lists the XMPP connection socket to allow i/o master to wake
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* when input comes in here as well as from the queue source.
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*
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* @return array of resources
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*/
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public function getSockets()
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{
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return array($this->conn->getSocket());
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}
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/**
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* Process XMPP events that have come in over the wire.
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* Side effects: may switch site configuration
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* @fixme may kill process on XMPP error
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* @param resource $socket
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*/
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public function handleInput($socket)
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{
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$this->switchSite();
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# Process the queue for as long as needed
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try {
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if ($this->conn) {
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assert($socket === $this->conn->getSocket());
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common_log(LOG_DEBUG, "Servicing the XMPP queue.");
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$this->stats('xmpp_process');
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$this->conn->processTime(0);
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}
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} catch (XMPPHP_Exception $e) {
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common_log(LOG_ERR, "Got an XMPPHP_Exception: " . $e->getMessage());
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die($e->getMessage());
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}
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}
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/**
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* Idle processing for io manager's execution loop.
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* Send keepalive pings to server.
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*
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* Side effect: kills process on exception from XMPP library.
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*
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* @fixme non-dying error handling
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*/
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public function idle($timeout=0)
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{
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if ($this->conn) {
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$now = time();
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if (empty($this->lastping) || $now - $this->lastping > self::PING_INTERVAL) {
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$this->switchSite();
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try {
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$this->sendPing();
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$this->lastping = $now;
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} catch (XMPPHP_Exception $e) {
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common_log(LOG_ERR, "Got an XMPPHP_Exception: " . $e->getMessage());
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die($e->getMessage());
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}
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}
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}
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}
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/**
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* Send a keepalive ping to the XMPP server.
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*/
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protected function sendPing()
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{
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$jid = jabber_daemon_address().'/'.$this->resource();
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$server = common_config('xmpp', 'server');
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if (!isset($this->pingid)) {
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$this->pingid = 0;
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} else {
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$this->pingid++;
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}
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common_log(LOG_DEBUG, "Sending ping #{$this->pingid}");
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$this->conn->send("<iq from='{$jid}' to='{$server}' id='ping_{$this->pingid}' type='get'><ping xmlns='urn:xmpp:ping'/></iq>");
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}
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/**
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* Callback for Jabber reconnect event
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* @param $pl
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*/
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function handle_reconnect(&$pl)
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{
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common_log(LOG_NOTICE, 'XMPP reconnected');
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$this->conn->processUntil('session_start');
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$this->conn->presence(null, 'available', null, 'available', -1);
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}
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/**
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* Callback for Jabber message event.
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*
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* This connection handles output; if we get a message straight to us,
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* forward it on to our XmppDaemon listener for processing.
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*
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* @param $pl
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*/
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function forward_message(&$pl)
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{
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if ($pl['type'] != 'chat') {
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common_log(LOG_DEBUG, 'Ignoring message of type ' . $pl['type'] . ' from ' . $pl['from']);
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return;
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}
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$listener = $this->listener();
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if (strtolower($listener) == strtolower($pl['from'])) {
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common_log(LOG_WARNING, 'Ignoring loop message.');
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return;
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}
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common_log(LOG_INFO, 'Forwarding message from ' . $pl['from'] . ' to ' . $listener);
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$this->conn->message($this->listener(), $pl['body'], 'chat', null, $this->ofrom($pl['from']));
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}
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/**
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* Build an <addresses> block with an ofrom entry for forwarded messages
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*
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* @param string $from Jabber ID of original sender
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* @return string XML fragment
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*/
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protected function ofrom($from)
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{
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$address = "<addresses xmlns='http://jabber.org/protocol/address'>\n";
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$address .= "<address type='ofrom' jid='$from' />\n";
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$address .= "</addresses>\n";
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return $address;
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}
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/**
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* Build the complete JID of the XmppDaemon process which
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* handles primary XMPP input for this site.
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*
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* @return string Jabber ID
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*/
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protected function listener()
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{
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if (common_config('xmpp', 'listener')) {
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return common_config('xmpp', 'listener');
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} else {
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return jabber_daemon_address() . '/' . common_config('xmpp','resource') . 'daemon';
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}
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}
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protected function resource()
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{
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return 'queue' . posix_getpid(); // @fixme PIDs won't be host-unique
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}
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/**
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* Make sure we're on the right site configuration
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*/
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protected function switchSite()
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{
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if ($this->site != common_config('site', 'server')) {
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common_log(LOG_DEBUG, __METHOD__ . ": switching to site $this->site");
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$this->stats('switch');
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StatusNet::init($this->site);
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}
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}
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}
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