ttrss/update_daemon2.php

194 lines
4.7 KiB
PHP
Executable File

#!/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");
}
$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);
}
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) {
_debug("[MASTER] spawned client $j [PID:$pid]...");
array_push($children, $pid);
$ctimes[$pid] = time();
} else {
pcntl_signal(SIGCHLD, SIG_IGN);
$quiet = (isset($options["quiet"])) ? "--quiet" : "";
$my_pid = posix_getpid();
passthru(PHP_EXECUTABLE . " update.php --daemon-loop $quiet --task $j --pidlock $my_pid");
sleep(1);
// We exit in order to avoid fork bombing.
exit(0);
}
}
$last_checkpoint = time();
}
sleep(1);
}
?>