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         require_once "functions.php";
  18         require_once "rssfuncs.php";
  19         require_once "sanity_check.php";
  20         require_once "config.php";
  21         require_once "db.php";
  22         require_once "db-prefs.php";
  23
  24         // defaults
  25         define('PURGE_INTERVAL', 3600); // seconds
  26         define('MAX_CHILD_RUNTIME', 600); // seconds
  27         define('MAX_JOBS', 2);
  28         define('SPAWN_INTERVAL', DAEMON_SLEEP_INTERVAL); // seconds
  29
  30         if (!function_exists('pcntl_fork')) {
  31                 die("error: This script requires PHP compiled with PCNTL module.\n");
  32         }
  33
  34         $master_handlers_installed = false;
  35
  36         $children = array();
  37         $ctimes = array();
  38
  39         $last_checkpoint = -1;
  40
  41         function reap_children() {
  42                 global $children;
  43                 global $ctimes;
  44
  45                 $tmp = array();
  46
  47                 foreach ($children as $pid) {
  48                         if (pcntl_waitpid($pid, $status, WNOHANG) != $pid) {
  49
  50                                 if (file_is_locked("update_daemon-$pid.lock")) {
  51                                         array_push($tmp, $pid);
  52                                 } else {
  53                                         _debug("[reap_children] child $pid seems active but lockfile is unlocked.");
  54                                         unset($ctimes[$pid]);
  55
  56                                 }
  57                         } else {
  58                                 _debug("[reap_children] child $pid reaped.");
  59                                 unset($ctimes[$pid]);
  60                         }
  61                 }
  62
  63                 $children = $tmp;
  64
  65                 return count($tmp);
  66         }
  67
  68         function check_ctimes() {
  69                 global $ctimes;
  70
  71                 foreach (array_keys($ctimes) as $pid) {
  72                         $started = $ctimes[$pid];
  73
  74                         if (time() - $started > MAX_CHILD_RUNTIME) {
  75                                 _debug("[MASTER] child process $pid seems to be stuck, aborting...");
  76                                 posix_kill($pid, SIGKILL);
  77                         }
  78                 }
  79         }
  80
  81         function sigchld_handler($signal) {
  82                 $running_jobs = reap_children();
  83
  84                 _debug("[SIGCHLD] jobs left: $running_jobs");
  85
  86                 pcntl_waitpid(-1, $status, WNOHANG);
  87         }
  88
  89         function shutdown($caller_pid) {
  90                 if ($caller_pid == posix_getpid()) {
  91                         if (file_exists(LOCK_DIRECTORY . "/update_daemon.lock")) {
  92                                 _debug("removing lockfile (master)...");
  93                                 unlink(LOCK_DIRECTORY . "/update_daemon.lock");
  94                         }
  95                 }
  96         }
  97
  98         function task_shutdown() {
  99                 $pid = posix_getpid();
 100
 101                 if (file_exists(LOCK_DIRECTORY . "/update_daemon-$pid.lock")) {
 102                         _debug("removing lockfile ($pid)...");
 103                         unlink(LOCK_DIRECTORY . "/update_daemon-$pid.lock");
 104                 }
 105         }
 106
 107         function sigint_handler() {
 108                 _debug("[MASTER] SIG_INT received.\n");
 109                 shutdown(posix_getpid());
 110                 die;
 111         }
 112
 113         function task_sigint_handler() {
 114                 _debug("[TASK] SIG_INT received.\n");
 115                 task_shutdown();
 116                 die;
 117         }
 118
 119         pcntl_signal(SIGCHLD, 'sigchld_handler');
 120
 121         $longopts = array("log:",
 122                         "tasks:",
 123                         "interval",
 124                         "help");
 125
 126         $options = getopt("", $longopts);
 127
 128         if (isset($options["help"]) ) {
 129                 print "Tiny Tiny RSS update daemon.\n\n";
 130                 print "Options:\n";
 131                 print "  --log FILE           - log messages to FILE\n";
 132                 print "  --tasks N            - amount of update tasks to spawn\n";
 133                 print "                         default: " . MAX_JOBS . "\n";
 134                 print "  --interval N         - task spawn interval\n";
 135                 print "                         default: " . SPAWN_INTERVAL . " seconds.\n";
 136                 print "  --quiet              - don't output messages to stdout\n";
 137                 return;
 138         }
 139
 140         define('QUIET', isset($options['quiet']));
 141
 142         if (isset($options["tasks"])) {
 143                 _debug("Set to spawn " . $options["tasks"] . " children.");
 144                 $max_jobs = $option["tasks"];
 145         } else {
 146                 $max_jobs = MAX_JOBS;
 147         }
 148
 149         if (isset($options["interval"])) {
 150                 _debug("Spawn interval: " . $options["interval"] . " seconds.");
 151                 $spawn_interval = $option["interval"];
 152         } else {
 153                 $spawn_interval = SPAWN_INTERVAL;
 154         }
 155
 156         if (isset($options["log"])) {
 157                 _debug("Logging to " . $options["log"]);
 158                 define('LOGFILE', $options["log"]);
 159         }
 160
 161         if (file_is_locked("update_daemon.lock")) {
 162                 die("error: Can't create lockfile. ".
 163                         "Maybe another daemon is already running.\n");
 164         }
 165
 166         // Try to lock a file in order to avoid concurrent update.
 167         $lock_handle = make_lockfile("update_daemon.lock");
 168
 169         if (!$lock_handle) {
 170                 die("error: Can't create lockfile. ".
 171                         "Maybe another daemon is already running.\n");
 172         }
 173
 174         // Testing database connection.
 175         // It is unnecessary to start the fork loop if database is not ok.
 176         $link = db_connect(DB_HOST, DB_USER, DB_PASS, DB_NAME);
 177
 178         if (!init_connection($link)) return;
 179
 180         db_close($link);
 181
 182         while (true) {
 183
 184                 // Since sleep is interupted by SIGCHLD, we need another way to
 185                 // respect the spawn interval
 186                 $next_spawn = $last_checkpoint + $spawn_interval - time();
 187
 188                 if ($next_spawn % 10 == 0) {
 189                         $running_jobs = count($children);
 190                         _debug("[MASTER] active jobs: $running_jobs, next spawn at $next_spawn sec.");
 191                 }
 192
 193                 if ($last_checkpoint + $spawn_interval < time()) {
 194
 195                         check_ctimes();
 196                         reap_children();
 197
 198                         for ($j = count($children); $j < $max_jobs; $j++) {
 199                                 $pid = pcntl_fork();
 200                                 if ($pid == -1) {
 201                                         die("fork failed!\n");
 202                                 } else if ($pid) {
 203
 204                                         if (!$master_handlers_installed) {
 205                                                 _debug("[MASTER] installing shutdown handlers");
 206                                                 pcntl_signal(SIGINT, 'sigint_handler');
 207                                                 register_shutdown_function('shutdown', posix_getpid());
 208                                                 $master_handlers_installed = true;
 209                                         }
 210
 211                                         _debug("[MASTER] spawned client $j [PID:$pid]...");
 212                                         array_push($children, $pid);
 213                                         $ctimes[$pid] = time();
 214                                 } else {
 215                                         pcntl_signal(SIGCHLD, SIG_IGN);
 216                                         pcntl_signal(SIGINT, 'task_sigint_handler');
 217
 218                                         register_shutdown_function('task_shutdown');
 219
 220                                         $my_pid = posix_getpid();
 221                                         $lock_filename = "update_daemon-$my_pid.lock";
 222
 223                                         $lock_handle = make_lockfile($lock_filename);
 224
 225                                         if (!$lock_handle) {
 226                                                 die("error: Can't create lockfile ($lock_filename). ".
 227                                                 "Maybe another daemon is already running.\n");
 228                                         }
 229
 230                                         // ****** Updating RSS code *******
 231                                         // Only run in fork process.
 232
 233                                         $start_timestamp = time();
 234
 235                                         $link = db_connect(DB_HOST, DB_USER, DB_PASS, DB_NAME);
 236
 237                                         if (!init_connection($link)) return;
 238
 239                                         // We disable stamp file, since it is of no use in a multiprocess update.
 240                                         // not really, tho for the time being -fox
 241                                         if (!make_stampfile('update_daemon.stamp')) {
 242                                                 die("error: unable to create stampfile\n");
 243                                         }
 244
 245                                         // Call to the feed batch update function
 246                                         // or regenerate feedbrowser cache
 247
 248                                         if (rand(0,100) > 30) {
 249                                                 update_daemon_common($link);
 250                                         } else {
 251                                                 $count = update_feedbrowser_cache($link);
 252                                                 _debug("Feedbrowser updated, $count feeds processed.");
 253
 254                                                 purge_orphans($link, true);
 255
 256                                                 $rc = cleanup_tags($link, 14, 50000);
 257
 258                                                 _debug("Cleaned $rc cached tags.");
 259
 260                                                 global $pluginhost;
 261                                                 $pluginhost->run_hooks($pluginhost::HOOK_UPDATE_TASK, "hook_update_task", $op);
 262                                         }
 263
 264                                         _debug("Elapsed time: " . (time() - $start_timestamp) . " second(s)");
 265
 266                                         db_close($link);
 267
 268                                         // We are in a fork.
 269                                         // We wait a little before exiting to avoid to be faster than our parent process.
 270                                         sleep(1);
 271
 272                                         unlink(LOCK_DIRECTORY . "/$lock_filename");
 273
 274                                         // We exit in order to avoid fork bombing.
 275                                         exit(0);
 276                                 }
 277
 278                                 // We wait a little time before the next fork, in order to let the first fork
 279                                 // mark the feeds it update :
 280                                 sleep(1);
 281                         }
 282                         $last_checkpoint = time();
 283                 }
 284                 sleep(1);
 285         }
 286
 287 ?>