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258 lines
6.7 KiB
PHP
258 lines
6.7 KiB
PHP
#!/usr/bin/env php
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<?php
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set_include_path(__DIR__ ."/include" . PATH_SEPARATOR .
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get_include_path());
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declare(ticks = 1);
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chdir(__DIR__);
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define('DISABLE_SESSIONS', true);
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require_once "autoload.php";
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require_once "functions.php";
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require_once "sanity_check.php";
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require_once "db-prefs.php";
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if (!function_exists('pcntl_fork')) {
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die("error: This script requires PHP compiled with PCNTL module.\n");
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}
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$options = getopt("");
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if (!is_array($options)) {
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die("error: getopt() failed. ".
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"Most probably you are using PHP CGI to run this script ".
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"instead of required PHP CLI. Check tt-rss wiki page on updating feeds for ".
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"additional information.\n");
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}
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$master_handlers_installed = false;
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$children = array();
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$ctimes = array();
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$last_checkpoint = -1;
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/**
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* @SuppressWarnings(unused)
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*/
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function reap_children() {
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global $children;
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global $ctimes;
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$tmp = array();
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foreach ($children as $pid) {
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if (pcntl_waitpid($pid, $status, WNOHANG) != $pid) {
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if (file_is_locked("update_daemon-$pid.lock")) {
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array_push($tmp, $pid);
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} else {
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Debug::log("Child process with PID $pid seems active but lockfile is unlocked.");
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unset($ctimes[$pid]);
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}
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} else {
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Debug::log("Child process with PID $pid reaped.");
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unset($ctimes[$pid]);
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}
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}
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$children = $tmp;
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return count($tmp);
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}
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function check_ctimes() {
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global $ctimes;
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foreach (array_keys($ctimes) as $pid) {
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$started = $ctimes[$pid];
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if (time() - $started > Config::get(Config::DAEMON_MAX_CHILD_RUNTIME)) {
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Debug::log("Child process with PID $pid seems to be stuck, aborting...");
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posix_kill($pid, SIGKILL);
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}
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}
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}
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/**
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* @SuppressWarnings(unused)
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*/
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function sigchld_handler($signal) {
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$running_jobs = reap_children();
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Debug::log("Received SIGCHLD, $running_jobs active tasks left.");
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pcntl_waitpid(-1, $status, WNOHANG);
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}
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function shutdown($caller_pid) {
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if ($caller_pid == posix_getpid()) {
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if (file_exists(Config::get(Config::LOCK_DIRECTORY) . "/update_daemon.lock")) {
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Debug::log("Removing lockfile (master)...");
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unlink(Config::get(Config::LOCK_DIRECTORY) . "/update_daemon.lock");
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}
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}
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}
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function task_shutdown() {
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$pid = posix_getpid();
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if (file_exists(Config::get(Config::LOCK_DIRECTORY) . "/update_daemon-$pid.lock")) {
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Debug::log("Removing task lockfile for PID $pid...");
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unlink(Config::get(Config::LOCK_DIRECTORY) . "/update_daemon-$pid.lock");
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}
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}
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function sigint_handler() {
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Debug::log("[MASTER] SIG_INT received, shutting down master process.");
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shutdown(posix_getpid());
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die;
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}
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function task_sigint_handler() {
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Debug::log("[TASK] SIG_INT received, shutting down task.");
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task_shutdown();
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die;
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}
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pcntl_signal(SIGCHLD, 'sigchld_handler');
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$longopts = array("log:",
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"log-level:",
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"tasks:",
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"interval:",
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"quiet",
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"help");
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$options = getopt("", $longopts);
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if (isset($options["help"]) ) {
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print "Tiny Tiny RSS update daemon.\n\n";
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print "Options:\n";
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print " --log FILE - log messages to FILE\n";
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print " --log-level N - log verbosity level\n";
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print " --tasks N - amount of update tasks to spawn\n";
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print " default: " . Config::get(Config::DAEMON_MAX_JOBS) . "\n";
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print " --interval N - task spawn interval\n";
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print " default: " . Config::get(Config::DAEMON_SLEEP_INTERVAL) . " seconds.\n";
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print " --quiet - don't output messages to stdout\n";
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return;
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}
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Debug::set_enabled(true);
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if (isset($options["log-level"])) {
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Debug::set_loglevel((int)$options["log-level"]);
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}
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if (isset($options["log"])) {
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Debug::set_quiet(isset($options['quiet']));
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Debug::set_logfile($options["log"]);
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Debug::log("Logging to " . $options["log"]);
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} else {
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if (isset($options['quiet'])) {
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Debug::set_loglevel(Debug::$LOG_DISABLED);
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}
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}
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if (isset($options["tasks"])) {
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Debug::log("Set to spawn " . $options["tasks"] . " children.");
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$max_jobs = $options["tasks"];
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} else {
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$max_jobs = Config::get(Config::DAEMON_MAX_JOBS);
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}
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if (isset($options["interval"])) {
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Debug::log("Spawn interval: " . $options["interval"] . " seconds.");
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$spawn_interval = $options["interval"];
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} else {
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$spawn_interval = Config::get(Config::DAEMON_SLEEP_INTERVAL);
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}
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// let's enforce a minimum spawn interval as to not forkbomb the host
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$spawn_interval = max(60, $spawn_interval);
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Debug::log("Spawn interval: $spawn_interval sec");
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if (file_is_locked("update_daemon.lock")) {
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die("error: Can't create lockfile. ".
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"Maybe another daemon is already running.\n");
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}
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// Try to lock a file in order to avoid concurrent update.
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$lock_handle = make_lockfile("update_daemon.lock");
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if (!$lock_handle) {
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die("error: Can't create lockfile. ".
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"Maybe another daemon is already running.\n");
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}
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$schema_version = get_schema_version();
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if ($schema_version != SCHEMA_VERSION) {
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die("Schema version is wrong, please upgrade the database.\n");
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}
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// Protip: children close shared database handle when terminating, it's a bad idea to
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// do database stuff on main process from now on.
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while (true) {
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// Since sleep is interupted by SIGCHLD, we need another way to
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// respect the spawn interval
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$next_spawn = $last_checkpoint + $spawn_interval - time();
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if ($next_spawn % 60 == 0) {
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$running_jobs = count($children);
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Debug::log("$running_jobs active tasks, next spawn at $next_spawn sec.");
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}
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if ($last_checkpoint + $spawn_interval < time()) {
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check_ctimes();
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reap_children();
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for ($j = count($children); $j < $max_jobs; $j++) {
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$pid = pcntl_fork();
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if ($pid == -1) {
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die("fork failed!\n");
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} else if ($pid) {
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if (!$master_handlers_installed) {
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Debug::log("Installing shutdown handlers");
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pcntl_signal(SIGINT, 'sigint_handler');
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pcntl_signal(SIGTERM, 'sigint_handler');
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register_shutdown_function('shutdown', posix_getpid());
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$master_handlers_installed = true;
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}
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Debug::log("Spawned child process with PID $pid for task $j.");
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array_push($children, $pid);
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$ctimes[$pid] = time();
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} else {
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pcntl_signal(SIGCHLD, SIG_IGN);
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pcntl_signal(SIGINT, 'task_sigint_handler');
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register_shutdown_function('task_shutdown');
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$quiet = (isset($options["quiet"])) ? "--quiet" : "";
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$log = function_exists("flock") && isset($options['log']) ? '--log '.$options['log'] : '';
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$my_pid = posix_getpid();
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passthru(Config::get(Config::PHP_EXECUTABLE) . " update.php --daemon-loop $quiet $log --task $j --pidlock $my_pid");
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sleep(1);
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// We exit in order to avoid fork bombing.
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exit(0);
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}
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}
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$last_checkpoint = time();
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}
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sleep(1);
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}
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?>
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