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         // Try to lock a file in order to avoid concurrent update.
 117         $lock_handle = make_lockfile("update_daemon.lock");
 118
 119         if (!$lock_handle) {
 120                 die("error: Can't create lockfile. ".
 121                         "Maybe another daemon is already running.\n");
 122         }
 123
 124         /* if (!pcntl_fork()) {
 125                 pcntl_signal(SIGINT, 'sigint_handler');
 126                 register_shutdown_function('shutdown');
 127
 128                 // Try to lock a file in order to avoid concurrent update.
 129                 $lock_handle = make_lockfile("update_daemon.lock");
 130
 131                 if (!$lock_handle) {
 132                         die("error: Can't create lockfile. ".
 133                                 "Maybe another daemon is already running.\n");
 134                 }
 135
 136                 while (true) { sleep(100); }
 137         } */
 138
 139         // Testing database connection.
 140         // It is unnecessary to start the fork loop if database is not ok.
 141         $link = db_connect(DB_HOST, DB_USER, DB_PASS, DB_NAME);
 142
 143         if (!init_connection($link)) return;
 144
 145         db_close($link);
 146
 147         while (true) {
 148
 149                 // Since sleep is interupted by SIGCHLD, we need another way to
 150                 // respect the SPAWN_INTERVAL
 151                 $next_spawn = $last_checkpoint + SPAWN_INTERVAL - time();
 152
 153                 if ($next_spawn % 10 == 0) {
 154                         $running_jobs = count($children);
 155                         _debug("[MASTER] active jobs: $running_jobs, next spawn at $next_spawn sec.");
 156                 }
 157
 158                 if ($last_checkpoint + SPAWN_INTERVAL < time()) {
 159
 160                         check_ctimes();
 161                         reap_children();
 162
 163                         for ($j = count($children); $j < MAX_JOBS; $j++) {
 164                                 $pid = pcntl_fork();
 165                                 if ($pid == -1) {
 166                                         die("fork failed!\n");
 167                                 } else if ($pid) {
 168                                         _debug("[MASTER] spawned client $j [PID:$pid]...");
 169                                         array_push($children, $pid);
 170                                         $ctimes[$pid] = time();
 171                                 } else {
 172                                         pcntl_signal(SIGCHLD, SIG_IGN);
 173                                         pcntl_signal(SIGINT, 'task_sigint_handler');
 174
 175                                         register_shutdown_function('task_shutdown');
 176
 177                                         $my_pid = posix_getpid();
 178                                         $lock_filename = "update_daemon-$my_pid.lock";
 179
 180                                         $lock_handle = make_lockfile($lock_filename);
 181
 182                                         if (!$lock_handle) {
 183                                                 die("error: Can't create lockfile ($lock_filename). ".
 184                                                 "Maybe another daemon is already running.\n");
 185                                         }
 186
 187                                         // ****** Updating RSS code *******
 188                                         // Only run in fork process.
 189
 190                                         $start_timestamp = time();
 191
 192                                         $link = db_connect(DB_HOST, DB_USER, DB_PASS, DB_NAME);
 193
 194                                         if (!init_connection($link)) return;
 195
 196                                         // We disable stamp file, since it is of no use in a multiprocess update.
 197                                         // not really, tho for the time being -fox
 198                                         if (!make_stampfile('update_daemon.stamp')) {
 199                                                 print "warning: unable to create stampfile";
 200                                         }
 201
 202                                         // Call to the feed batch update function
 203                                         // or regenerate feedbrowser cache
 204
 205                                         if (rand(0,100) > 30) {
 206                                                 update_daemon_common($link);
 207                                         } else {
 208                                                 $count = update_feedbrowser_cache($link);
 209                                                 _debug("Feedbrowser updated, $count feeds processed.");
 210
 211                                                 purge_orphans($link, true);
 212
 213                                                 $rc = cleanup_tags($link, 14, 50000);
 214
 215                                                 _debug("Cleaned $rc cached tags.");
 216
 217                                                 global $pluginhost;
 218                                                 $pluginhost->run_hooks($pluginhost::HOOK_UPDATE_TASK, "hook_update_task", $op);
 219                                         }
 220
 221                                         _debug("Elapsed time: " . (time() - $start_timestamp) . " second(s)");
 222
 223                                         db_close($link);
 224
 225                                         // We are in a fork.
 226                                         // We wait a little before exiting to avoid to be faster than our parent process.
 227                                         sleep(1);
 228
 229                                         unlink(LOCK_DIRECTORY . "/$lock_filename");
 230
 231                                         // We exit in order to avoid fork bombing.
 232                                         exit(0);
 233                                 }
 234
 235                                 // We wait a little time before the next fork, in order to let the first fork
 236                                 // mark the feeds it update :
 237                                 sleep(1);
 238                         }
 239                         $last_checkpoint = time();
 240                 }
 241                 sleep(1);
 242         }
 243
 244 ?>