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#!/usr/bin/php
<?php
// This is an experimental multiprocess update daemon.
// Some configurable variable may be found below.
// define('DEFAULT_ERROR_LEVEL', E_ALL);
define('DEFAULT_ERROR_LEVEL', E_ERROR | E_WARNING | E_PARSE);
declare(ticks = 1);
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 "sanity_check.php";
require_once "config.php";
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");
}
if (!ENABLE_UPDATE_DAEMON) {
die("error: Please enable option ENABLE_UPDATE_DAEMON in config.php\n");
}
require_once "db.php";
require_once "db-prefs.php";
require_once "functions.php";
require_once "lib/magpierss/rss_fetch.inc";
error_reporting(DEFAULT_ERROR_LEVEL);
$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) != $pid) {
array_push($tmp, $pid);
} else {
_debug("[SIGCHLD] 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 sigint_handler() {
unlink(LOCK_DIRECTORY . "/update_daemon.lock");
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');
// 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.
$link = db_connect(DB_HOST, DB_USER, DB_PASS, DB_NAME);
if (!$link) {
if (DB_TYPE == "mysql") {
print mysql_error();
}
// PG seems to display its own errors just fine by default.
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, SIG_DFL);
// ****** Updating RSS code *******
// Only run in fork process.
$start_timestamp = time();
$link = db_connect(DB_HOST, DB_USER, DB_PASS, DB_NAME);
if (!$link) {
if (DB_TYPE == "mysql") {
print mysql_error();
}
// PG seems to display its own errors just fine by default.
return;
}
init_connection($link);
// 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";
}
// FIXME : $last_purge is of no use in a multiprocess update.
// FIXME : We ALWAYS purge old posts.
//_debug("Purging old posts (random 30 feeds)...");
//global_purge_old_posts($link, true, 30);
// Call to the feed batch update function
// or regenerate feedbrowser cache
if (rand(0,100) > 50) {
update_daemon_common($link);
} else {
$count = update_feedbrowser_cache($link);
_debug("Finished, $count feeds processed.");
}
_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);
// 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);
}
?>
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