#!/usr/bin/env php <?php set_include_path(get_include_path() . PATH_SEPARATOR . dirname(__FILE__) . "/include"); // This is an experimental multiprocess update daemon. // Some configurable variable may be found below. declare(ticks = 1); chdir(dirname(__FILE__)); define('DISABLE_SESSIONS', true); require_once "version.php"; if (strpos(VERSION, ".99") !== false || getenv('DAEMON_XDEBUG')) { define('DAEMON_EXTENDED_DEBUG', true); } define('PURGE_INTERVAL', 3600); // seconds define('MAX_CHILD_RUNTIME', 600); // seconds require_once "functions.php"; require_once "rssfuncs.php"; require_once "sanity_check.php"; require_once "config.php"; require_once "db.php"; require_once "db-prefs.php"; require_once "lib/magpierss/rss_fetch.inc"; define('MAX_JOBS', 2); define('SPAWN_INTERVAL', DAEMON_SLEEP_INTERVAL); if (!function_exists('pcntl_fork')) { die("error: This script requires PHP compiled with PCNTL module.\n"); } $children = array(); $ctimes = array(); $last_checkpoint = -1; function reap_children() { global $children; global $ctimes; $tmp = array(); foreach ($children as $pid) { if (pcntl_waitpid($pid, $status, WNOHANG) != $pid) { if (file_is_locked("update_daemon-$pid.lock")) { array_push($tmp, $pid); } else { _debug("[reap_children] child $pid seems active but lockfile is unlocked."); unset($ctimes[$pid]); } } else { _debug("[reap_children] child $pid reaped."); unset($ctimes[$pid]); } } $children = $tmp; return count($tmp); } function check_ctimes() { global $ctimes; foreach (array_keys($ctimes) as $pid) { $started = $ctimes[$pid]; if (time() - $started > MAX_CHILD_RUNTIME) { _debug("[MASTER] child process $pid seems to be stuck, aborting..."); posix_kill($pid, SIGKILL); } } } function sigchld_handler($signal) { $running_jobs = reap_children(); _debug("[SIGCHLD] jobs left: $running_jobs"); pcntl_waitpid(-1, $status, WNOHANG); } function shutdown() { if (file_exists(LOCK_DIRECTORY . "/update_daemon.lock")) unlink(LOCK_DIRECTORY . "/update_daemon.lock"); } function task_shutdown() { $pid = posix_getpid(); if (file_exists(LOCK_DIRECTORY . "/update_daemon-$pid.lock")) unlink(LOCK_DIRECTORY . "/update_daemon-$pid.lock"); } function sigint_handler() { shutdown(); die("[SIGINT] removing lockfile and exiting.\n"); } function task_sigint_handler() { task_shutdown(); die("[SIGINT] removing lockfile and exiting.\n"); } pcntl_signal(SIGCHLD, 'sigchld_handler'); if (file_is_locked("update_daemon.lock")) { die("error: Can't create lockfile. ". "Maybe another daemon is already running.\n"); } if (!pcntl_fork()) { pcntl_signal(SIGINT, 'sigint_handler'); register_shutdown_function('shutdown'); // Try to lock a file in order to avoid concurrent update. $lock_handle = make_lockfile("update_daemon.lock"); if (!$lock_handle) { die("error: Can't create lockfile. ". "Maybe another daemon is already running.\n"); } while (true) { sleep(100); } } // Testing database connection. // It is unnecessary to start the fork loop if database is not ok. $link = db_connect(DB_HOST, DB_USER, DB_PASS, DB_NAME); if (!init_connection($link)) return; db_close($link); while (true) { // Since sleep is interupted by SIGCHLD, we need another way to // respect the SPAWN_INTERVAL $next_spawn = $last_checkpoint + SPAWN_INTERVAL - time(); if ($next_spawn % 10 == 0) { $running_jobs = count($children); _debug("[MASTER] active jobs: $running_jobs, next spawn at $next_spawn sec."); } if ($last_checkpoint + SPAWN_INTERVAL < time()) { check_ctimes(); reap_children(); for ($j = count($children); $j < MAX_JOBS; $j++) { $pid = pcntl_fork(); if ($pid == -1) { die("fork failed!\n"); } else if ($pid) { _debug("[MASTER] spawned client $j [PID:$pid]..."); array_push($children, $pid); $ctimes[$pid] = time(); } else { pcntl_signal(SIGCHLD, SIG_IGN); pcntl_signal(SIGINT, 'task_sigint_handler'); register_shutdown_function('task_shutdown'); $my_pid = posix_getpid(); $lock_filename = "update_daemon-$my_pid.lock"; $lock_handle = make_lockfile($lock_filename); if (!$lock_handle) { die("error: Can't create lockfile ($lock_filename). ". "Maybe another daemon is already running.\n"); } // ****** Updating RSS code ******* // Only run in fork process. $start_timestamp = time(); $link = db_connect(DB_HOST, DB_USER, DB_PASS, DB_NAME); if (!init_connection($link)) return; // We disable stamp file, since it is of no use in a multiprocess update. // not really, tho for the time being -fox if (!make_stampfile('update_daemon.stamp')) { print "warning: unable to create stampfile"; } // Call to the feed batch update function // or regenerate feedbrowser cache if (rand(0,100) > 30) { update_daemon_common($link); } else { $count = update_feedbrowser_cache($link); _debug("Feedbrowser updated, $count feeds processed."); purge_orphans($link, true); $rc = cleanup_tags($link, 14, 50000); _debug("Cleaned $rc cached tags."); _debug("Updating linked feeds..."); get_linked_feeds($link); } _debug("Elapsed time: " . (time() - $start_timestamp) . " second(s)"); db_close($link); // We are in a fork. // We wait a little before exiting to avoid to be faster than our parent process. sleep(1); unlink(LOCK_DIRECTORY . "/$lock_filename"); // We exit in order to avoid fork bombing. exit(0); } // We wait a little time before the next fork, in order to let the first fork // mark the feeds it update : sleep(1); } $last_checkpoint = time(); } sleep(1); } ?>