update_daemon2.php

   1 #!/usr/bin/env php
   2 <?php
   3         set_include_path(dirname(__FILE__) ."/include" . PATH_SEPARATOR .
   4                 get_include_path());
   5
   6         declare(ticks = 1);
   7         chdir(dirname(__FILE__));
   8
   9         define('DISABLE_SESSIONS', true);
  10
  11         require_once "version.php";
  12
  13         if (strpos(VERSION, ".99") !== false || getenv('DAEMON_XDEBUG')) {
  14                 define('DAEMON_EXTENDED_DEBUG', true);
  15         }
  16
  17         define('PURGE_INTERVAL', 3600); // seconds
  18         define('MAX_CHILD_RUNTIME', 600); // seconds
  19
  20         require_once "functions.php";
  21         require_once "rssfuncs.php";
  22         require_once "sanity_check.php";
  23         require_once "config.php";
  24         require_once "db.php";
  25         require_once "db-prefs.php";
  26
  27         define('MAX_JOBS', 2);
  28         define('SPAWN_INTERVAL', DAEMON_SLEEP_INTERVAL);
  29
  30         if (!function_exists('pcntl_fork')) {
  31                 die("error: This script requires PHP compiled with PCNTL module.\n");
  32         }
  33
  34         $children = array();
  35         $ctimes = array();
  36
  37         $last_checkpoint = -1;
  38
  39         function reap_children() {
  40                 global $children;
  41                 global $ctimes;
  42
  43                 $tmp = array();
  44
  45                 foreach ($children as $pid) {
  46                         if (pcntl_waitpid($pid, $status, WNOHANG) != $pid) {
  47
  48                                 if (file_is_locked("update_daemon-$pid.lock")) {
  49                                         array_push($tmp, $pid);
  50                                 } else {
  51                                         _debug("[reap_children] child $pid seems active but lockfile is unlocked.");
  52                                         unset($ctimes[$pid]);
  53
  54                                 }
  55                         } else {
  56                                 _debug("[reap_children] child $pid reaped.");
  57                                 unset($ctimes[$pid]);
  58                         }
  59                 }
  60
  61                 $children = $tmp;
  62
  63                 return count($tmp);
  64         }
  65
  66         function check_ctimes() {
  67                 global $ctimes;
  68
  69                 foreach (array_keys($ctimes) as $pid) {
  70                         $started = $ctimes[$pid];
  71
  72                         if (time() - $started > MAX_CHILD_RUNTIME) {
  73                                 _debug("[MASTER] child process $pid seems to be stuck, aborting...");
  74                                 posix_kill($pid, SIGKILL);
  75                         }
  76                 }
  77         }
  78
  79         function sigchld_handler($signal) {
  80                 $running_jobs = reap_children();
  81
  82                 _debug("[SIGCHLD] jobs left: $running_jobs");
  83
  84                 pcntl_waitpid(-1, $status, WNOHANG);
  85         }
  86
  87         function shutdown() {
  88                 if (file_exists(LOCK_DIRECTORY . "/update_daemon.lock"))
  89                         unlink(LOCK_DIRECTORY . "/update_daemon.lock");
  90         }
  91
  92         function task_shutdown() {
  93                 $pid = posix_getpid();
  94
  95                 if (file_exists(LOCK_DIRECTORY . "/update_daemon-$pid.lock"))
  96                         unlink(LOCK_DIRECTORY . "/update_daemon-$pid.lock");
  97         }
  98
  99         function sigint_handler() {
 100                 shutdown();
 101                 die("[SIGINT] removing lockfile and exiting.\n");
 102         }
 103
 104         function task_sigint_handler() {
 105                 task_shutdown();
 106                 die("[SIGINT] removing lockfile and exiting.\n");
 107         }
 108
 109         pcntl_signal(SIGCHLD, 'sigchld_handler');
 110
 111         if (file_is_locked("update_daemon.lock")) {
 112                 die("error: Can't create lockfile. ".
 113                         "Maybe another daemon is already running.\n");
 114         }
 115
 116         if (!pcntl_fork()) {
 117                 pcntl_signal(SIGINT, 'sigint_handler');
 118                 register_shutdown_function('shutdown');
 119
 120                 // Try to lock a file in order to avoid concurrent update.
 121                 $lock_handle = make_lockfile("update_daemon.lock");
 122
 123                 if (!$lock_handle) {
 124                         die("error: Can't create lockfile. ".
 125                                 "Maybe another daemon is already running.\n");
 126                 }
 127
 128                 while (true) { sleep(100); }
 129         }
 130
 131         // Testing database connection.
 132         // It is unnecessary to start the fork loop if database is not ok.
 133         $link = db_connect(DB_HOST, DB_USER, DB_PASS, DB_NAME);
 134
 135         if (!init_connection($link)) return;
 136
 137         db_close($link);
 138
 139         while (true) {
 140
 141                 // Since sleep is interupted by SIGCHLD, we need another way to
 142                 // respect the SPAWN_INTERVAL
 143                 $next_spawn = $last_checkpoint + SPAWN_INTERVAL - time();
 144
 145                 if ($next_spawn % 10 == 0) {
 146                         $running_jobs = count($children);
 147                         _debug("[MASTER] active jobs: $running_jobs, next spawn at $next_spawn sec.");
 148                 }
 149
 150                 if ($last_checkpoint + SPAWN_INTERVAL < time()) {
 151
 152                         check_ctimes();
 153                         reap_children();
 154
 155                         for ($j = count($children); $j < MAX_JOBS; $j++) {
 156                                 $pid = pcntl_fork();
 157                                 if ($pid == -1) {
 158                                         die("fork failed!\n");
 159                                 } else if ($pid) {
 160                                         _debug("[MASTER] spawned client $j [PID:$pid]...");
 161                                         array_push($children, $pid);
 162                                         $ctimes[$pid] = time();
 163                                 } else {
 164                                         pcntl_signal(SIGCHLD, SIG_IGN);
 165                                         pcntl_signal(SIGINT, 'task_sigint_handler');
 166
 167                                         register_shutdown_function('task_shutdown');
 168
 169                                         $my_pid = posix_getpid();
 170                                         $lock_filename = "update_daemon-$my_pid.lock";
 171
 172                                         $lock_handle = make_lockfile($lock_filename);
 173
 174                                         if (!$lock_handle) {
 175                                                 die("error: Can't create lockfile ($lock_filename). ".
 176                                                 "Maybe another daemon is already running.\n");
 177                                         }
 178
 179                                         // ****** Updating RSS code *******
 180                                         // Only run in fork process.
 181
 182                                         $start_timestamp = time();
 183
 184                                         $link = db_connect(DB_HOST, DB_USER, DB_PASS, DB_NAME);
 185
 186                                         if (!init_connection($link)) return;
 187
 188                                         // We disable stamp file, since it is of no use in a multiprocess update.
 189                                         // not really, tho for the time being -fox
 190                                         if (!make_stampfile('update_daemon.stamp')) {
 191                                                 print "warning: unable to create stampfile";
 192                                         }
 193
 194                                         // Call to the feed batch update function
 195                                         // or regenerate feedbrowser cache
 196
 197                                         if (rand(0,100) > 30) {
 198                                                 update_daemon_common($link);
 199                                         } else {
 200                                                 $count = update_feedbrowser_cache($link);
 201                                                 _debug("Feedbrowser updated, $count feeds processed.");
 202
 203                                                 purge_orphans($link, true);
 204
 205                                                 $rc = cleanup_tags($link, 14, 50000);
 206
 207                                                 _debug("Cleaned $rc cached tags.");
 208
 209                                                 global $pluginhost;
 210                                                 $pluginhost->run_hooks($pluginhost::HOOK_UPDATE_TASK, "hook_update_task", $op);
 211                                         }
 212
 213                                         _debug("Elapsed time: " . (time() - $start_timestamp) . " second(s)");
 214
 215                                         db_close($link);
 216
 217                                         // We are in a fork.
 218                                         // We wait a little before exiting to avoid to be faster than our parent process.
 219                                         sleep(1);
 220
 221                                         unlink(LOCK_DIRECTORY . "/$lock_filename");
 222
 223                                         // We exit in order to avoid fork bombing.
 224                                         exit(0);
 225                                 }
 226
 227                                 // We wait a little time before the next fork, in order to let the first fork
 228                                 // mark the feeds it update :
 229                                 sleep(1);
 230                         }
 231                         $last_checkpoint = time();
 232                 }
 233                 sleep(1);
 234         }
 235
 236 ?>