scripts daemonize themselves

darcs-hash:20080904184031-84dde-eba2061f3aa898d0c791ffeb70837f759778c567.gz

lib/common.php

@@ -94,6 +94,10 @@ $config =
 			  'public' => array()), # JIDs of users who want to receive the public stream
 		'tag' =>
 		array('dropoff' => 864000.0),
+		'daemon' =>
+		array('piddir' => '/var/run',
+			  'user' => false,
+			  'group' => false)
 		);
 
 $config['db'] = &PEAR::getStaticProperty('DB_DataObject','options');

lib/daemon.php

@@ -0,0 +1,117 @@
+<?php
+/*
+ * Laconica - a distributed open-source microblogging tool
+ * Copyright (C) 2008, Controlez-Vous, 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/>.
+ */
+
+if (!defined('LACONICA')) { exit(1); }
+
+class Daemon {
+
+	function name() {
+		return NULL;
+	}
+	
+	function background() {
+		$pid = pcntl_fork();
+		if ($pid < 0) { # error
+			return false;
+		} else if ($pid > 0) { # parent
+			common_log(LOG_INFO, "Successfully forked.");
+			exit(0);
+		} else { # child
+			return true;
+		}
+	}
+
+	function alreadyRunning() {
+
+		$pidfilename = $this->pidFilename();
+
+		if (!$pidfilename) {
+			return false;
+		}
+		
+		if (!file_exists($pidfilename)) {
+			return false;
+		}
+		$contents = file_get_contents($pidfilename);
+		if (posix_kill(trim($contents),0)) {
+			return true;
+		} else {
+			return false;
+		}
+	}
+	
+	function writePidFile() {
+		$pidfilename = $this->pidFilename();
+		
+		if (!$pidfilename) {
+			return false;
+		}
+		
+		file_put_contents($pidfilename, posix_getpid());
+	}
+
+	function clearPidFile() {
+		$pidfilename = $this->pidFilename();
+		unlink($pidfilename);
+	}
+	
+	function pidFilename() {
+		$piddir = common_config('daemon', 'piddir');
+		if (!$piddir) {
+			return NULL;
+		}
+		$name = $this->name();
+		if (!$name) {
+			return NULL;
+		}
+		return $piddir . '/' . $name;
+	}
+
+	function changeUser() {
+
+		if (common_config('daemon', 'user')) {
+			$user_info = posix_getpwnam(common_config('daemon', 'user'));
+			common_log(LOG_INFO, "Setting user to " . common_config('daemon', 'user'));
+			posix_setuid($user_info['uid']);
+		}
+		
+		if (common_config('daemon', 'group')) {
+			$group_info = posix_getgrnam(common_config('daemon', 'group'));
+			common_log(LOG_INFO, "Setting group to " . common_config('daemon', 'group'));
+			posix_setgid($group_info['gid']);
+		}
+	}
+	
+	function runOnce() {
+		if ($this->alreadyRunning()) {
+			common_log(LOG_INFO, $this->name() . ' already running. Exiting.');
+			exit(0);
+		}
+		if ($this->background()) {
+			$this->writePidFile();
+			$this->changeUser();
+			$this->run();
+			$this->clearPidFile();
+		}
+	}
+	
+	function run() {
+		return true;
+	}
+}

lib/queuehandler.php

@@ -19,7 +19,11 @@
 
 define('CLAIM_TIMEOUT', 1200);
 
-class QueueHandler {
+if (!defined('LACONICA')) { exit(1); }
+
+require_once(INSTALLDIR.'/lib/daemon.php');
+
+class QueueHandler extends Daemon {
 
 	var $_id = 'generic';
 
@@ -33,6 +37,10 @@ class QueueHandler {
 		return ucfirst($this->transport()) . 'Handler';
 	}
 
+	function name() {
+		return strtolower($this->class_name().'.'.$this->get_id());
+	}
+	
 	function get_id() {
 		return $this->_id;
 	}
@@ -55,7 +63,10 @@ class QueueHandler {
 		return true;
 	}
 	
-	function handle_queue() {
+	function run() {
+		if (!$this->start()) {
+			return false;
+		}
 		$this->log(LOG_INFO, 'checking for queued notices');
 		$transport = $this->transport();
 		do {
@@ -87,6 +98,10 @@ class QueueHandler {
 				$this->idle(5);
 			}	
 		} while (true);
+		if (!$this->finish()) {
+			return false;
+		}
+		return true;
 	}
 
 	function idle($timeout=0) {

scripts/ombqueuehandler.php

@@ -71,8 +71,4 @@ $id = ($argc > 1) ? $argv[1] : NULL;
 
 $handler = new OmbQueueHandler($id);
 
-if ($handler->start()) {
-	$handler->handle_queue();
-}
-
-$handler->finish();
+$handler->runOnce();

scripts/publicqueuehandler.php

@@ -105,8 +105,4 @@ $resource = ($argc > 1) ? $argv[1] : (common_config('xmpp','resource') . '-publi
 
 $handler = new PublicQueueHandler($resource);
 
-if ($handler->start()) {
-	$handler->handle_queue();
-}
-
-$handler->finish();
+$handler->runOnce();

scripts/smsqueuehandler.php

@@ -61,8 +61,4 @@ $id = ($argc > 1) ? $argv[1] : NULL;
 
 $handler = new SmsQueueHandler($id);
 
-if ($handler->start()) {
-	$handler->handle_queue();
-}
-
-$handler->finish();
+$handler->runOnce();

scripts/xmppconfirmhandler.php

@@ -63,7 +63,10 @@ class XmppConfirmHandler {
 		$this->conn->presence(NULL, 'available', NULL, 'available', -1);
 	}
 	
-	function handle_queue() {
+	function run() {
+		if (!$this->start()) {
+			return false;
+		}
 		$this->log(LOG_INFO, 'checking for queued confirmations');
 		do {
 			$confirm = $this->next_confirm();
@@ -99,6 +102,10 @@ class XmppConfirmHandler {
 				$this->idle(10);
 			}
 		} while (true);
+		if (!$this->finish()) {
+			return false;
+		}
+		return true;
 	}
 
 	function next_confirm() {
@@ -181,8 +188,5 @@ $resource = ($argc > 1) ? $argv[1] : (common_config('xmpp', 'resource').'-confir
 
 $handler = new XmppConfirmHandler($resource);
 
-if ($handler->start()) {
-	$handler->handle_queue();
-}
+$handler->runOnce();
 
-$handler->finish();

scripts/xmppdaemon.php

@@ -29,6 +29,7 @@ define('LACONICA', true);
 
 require_once(INSTALLDIR . '/lib/common.php');
 require_once(INSTALLDIR . '/lib/jabber.php');
+require_once(INSTALLDIR . '/lib/daemon.php');
 
 set_error_handler('common_error_handler');
 
@@ -36,7 +37,7 @@ set_error_handler('common_error_handler');
 # in jabber.php, which create a new XMPP class. A more elegant (?) solution
 # might be to use make this a subclass of XMPP.
 
-class XMPPDaemon {
+class XMPPDaemon extends Daemon {
 
 	function XMPPDaemon($resource=NULL) {
 		static $attrs = array('server', 'port', 'user', 'password', 'host');
@@ -74,13 +75,20 @@ class XMPPDaemon {
 		return !$this->conn->isDisconnected();
 	}
 
-	function handle() {
+	function name() {
+		return strtolower('xmppdaemon.'.$this->resource);
+	}
+	
+	function run() {
+		if ($this->connect()) {
+			
 			$this->conn->addEventHandler('message', 'handle_message', $this);
 			$this->conn->addEventHandler('presence', 'handle_presence', $this);
 			$this->conn->addEventHandler('reconnect', 'handle_reconnect', $this);
 			
 			$this->conn->process();
 		}
+	}
 
 	function handle_reconnect(&$pl) {
 		$this->conn->processUntil('session_start');
@@ -325,6 +333,4 @@ $resource = ($argc > 1) ? $argv[1] : (common_config('xmpp','resource') . '-liste
 
 $daemon = new XMPPDaemon($resource);
 
-if ($daemon->connect()) {
-	$daemon->handle();
-}
+$daemon->runOnce();

scripts/xmppqueuehandler.php

@@ -110,8 +110,4 @@ $resource = ($argc > 1) ? $argv[1] : (common_config('xmpp','resource') . '-queue
 
 $handler = new XmppQueueHandler($resource);
 
-if ($handler->start()) {
-	$handler->handle_queue();
-}
-
-$handler->finish();
+$handler->runOnce();