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- #!/usr/bin/env php
- <?php
- set_include_path(dirname(__FILE__) ."/include" . PATH_SEPARATOR .
- get_include_path());
- declare(ticks = 1);
- chdir(dirname(__FILE__));
- define('DISABLE_SESSIONS', true);
- require_once "version.php";
- require_once "config.php";
- require_once "autoload.php";
- require_once "functions.php";
- require_once "rssfuncs.php";
- // defaults
- define_default('PURGE_INTERVAL', 3600); // seconds
- define_default('MAX_CHILD_RUNTIME', 1800); // seconds
- define_default('MAX_JOBS', 2);
- define_default('SPAWN_INTERVAL', DAEMON_SLEEP_INTERVAL); // seconds
- require_once "sanity_check.php";
- require_once "db.php";
- require_once "db-prefs.php";
- if (!function_exists('pcntl_fork')) {
- die("error: This script requires PHP compiled with PCNTL module.\n");
- }
- $master_handlers_installed = false;
- $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, $status, WNOHANG);
- }
- function shutdown($caller_pid) {
- if ($caller_pid == posix_getpid()) {
- if (file_exists(LOCK_DIRECTORY . "/update_daemon.lock")) {
- _debug("removing lockfile (master)...");
- unlink(LOCK_DIRECTORY . "/update_daemon.lock");
- }
- }
- }
- function task_shutdown() {
- $pid = posix_getpid();
- if (file_exists(LOCK_DIRECTORY . "/update_daemon-$pid.lock")) {
- _debug("removing lockfile ($pid)...");
- unlink(LOCK_DIRECTORY . "/update_daemon-$pid.lock");
- }
- }
- function sigint_handler() {
- _debug("[MASTER] SIG_INT received.\n");
- shutdown(posix_getpid());
- die;
- }
- function task_sigint_handler() {
- _debug("[TASK] SIG_INT received.\n");
- task_shutdown();
- die;
- }
- pcntl_signal(SIGCHLD, 'sigchld_handler');
- $longopts = array("log:",
- "tasks:",
- "interval:",
- "quiet",
- "help");
- $options = getopt("", $longopts);
- if (isset($options["help"]) ) {
- print "Tiny Tiny RSS update daemon.\n\n";
- print "Options:\n";
- print " --log FILE - log messages to FILE\n";
- print " --tasks N - amount of update tasks to spawn\n";
- print " default: " . MAX_JOBS . "\n";
- print " --interval N - task spawn interval\n";
- print " default: " . SPAWN_INTERVAL . " seconds.\n";
- print " --quiet - don't output messages to stdout\n";
- return;
- }
- define('QUIET', isset($options['quiet']));
- if (isset($options["tasks"])) {
- _debug("Set to spawn " . $options["tasks"] . " children.");
- $max_jobs = $options["tasks"];
- } else {
- $max_jobs = MAX_JOBS;
- }
- if (isset($options["interval"])) {
- _debug("Spawn interval: " . $options["interval"] . " seconds.");
- $spawn_interval = $options["interval"];
- } else {
- $spawn_interval = SPAWN_INTERVAL;
- }
- if (isset($options["log"])) {
- _debug("Logging to " . $options["log"]);
- define('LOGFILE', $options["log"]);
- }
- if (file_is_locked("update_daemon.lock")) {
- die("error: Can't create lockfile. ".
- "Maybe another daemon is already running.\n");
- }
- // 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");
- }
- $schema_version = get_schema_version();
- if ($schema_version != SCHEMA_VERSION) {
- die("Schema version is wrong, please upgrade the database.\n");
- }
- // Protip: children close shared database handle when terminating, it's a bad idea to
- // do database stuff on main process from now on.
- 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 % 60 == 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 ($pid) {
- if (!$master_handlers_installed) {
- _debug("[MASTER] installing shutdown handlers");
- pcntl_signal(SIGINT, 'sigint_handler');
- pcntl_signal(SIGTERM, 'sigint_handler');
- register_shutdown_function('shutdown', posix_getpid());
- $master_handlers_installed = true;
- }
- _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');
- $quiet = (isset($options["quiet"])) ? "--quiet" : "";
- $log = function_exists("flock") && isset($options['log']) ? '--log '.$options['log'] : '';
- $my_pid = posix_getpid();
- passthru(PHP_EXECUTABLE . " update.php --daemon-loop $quiet $log --task $j --pidlock $my_pid");
- sleep(1);
- // We exit in order to avoid fork bombing.
- exit(0);
- }
- }
- $last_checkpoint = time();
- }
- sleep(1);
- }
- ?>
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