update_daemon.php

   1 #!/usr/bin/php
   2 <?php
   3         // this daemon runs in the background and updates all feeds
   4         // continuously
   5
   6         // define('DEFAULT_ERROR_LEVEL', E_ALL);
   7         define('DEFAULT_ERROR_LEVEL', E_ERROR | E_WARNING | E_PARSE);
   8
   9         declare(ticks = 1);
  10
  11         define('DISABLE_SESSIONS', true);
  12
  13         require_once "version.php";
  14
  15         if (strpos(VERSION, ".99") !== false || getenv('DAEMON_XDEBUG')) {
  16                 define('DAEMON_EXTENDED_DEBUG', true);
  17         }
  18
  19         define('PURGE_INTERVAL', 3600); // seconds
  20
  21         require_once "sanity_check.php";
  22         require_once "config.php";
  23
  24         if (!defined('PHP_EXECUTABLE')) {
  25                 define('PHP_EXECUTABLE', '/usr/bin/php');
  26         }
  27
  28         if (!ENABLE_UPDATE_DAEMON) {
  29                 die("Please enable option ENABLE_UPDATE_DAEMON in config.php\n");
  30         }
  31
  32         require_once "db.php";
  33         require_once "db-prefs.php";
  34         require_once "functions.php";
  35
  36         error_reporting(DEFAULT_ERROR_LEVEL);
  37
  38         function sigint_handler() {
  39                 unlink(LOCK_DIRECTORY . "/update_daemon.lock");
  40                 die("Received SIGINT. Exiting.\n");
  41         }
  42
  43         function sigalrm_handler() {
  44                 die("received SIGALRM, hang in feed update?\n");
  45         }
  46
  47         if (function_exists('pcntl_signal')) {
  48                 pcntl_signal(SIGINT, sigint_handler);
  49                 pcntl_signal(SIGALRM, sigalrm_handler);
  50         } else {
  51                 _debug("Warning: pcntl_signal function not present, continuing without support for signals.");
  52         }
  53
  54         $lock_handle = make_lockfile("update_daemon.lock");
  55
  56         if (!$lock_handle) {
  57                 die("error: Can't create lockfile ($lock_filename). ".
  58                         "Maybe another daemon is already running.\n");
  59         }
  60
  61         // Testing database connection.
  62         // It is unnecessary to start the fork loop if database is not ok.
  63         $link = db_connect(DB_HOST, DB_USER, DB_PASS, DB_NAME);
  64
  65         if (!$link) {
  66                 if (DB_TYPE == "mysql") {
  67                         print mysql_error();
  68                 }
  69                 // PG seems to display its own errors just fine by default.
  70                 return;
  71         }
  72
  73         db_close($link);
  74
  75         $last_purge = 0;
  76
  77         while (true) {
  78
  79                 passthru(PHP_EXECUTABLE . " update_daemon_loop.php SRV_RUN_OK");
  80
  81                 _debug("Sleeping for " . DAEMON_SLEEP_INTERVAL . " seconds...");
  82
  83                 sleep(DAEMON_SLEEP_INTERVAL);
  84         }
  85
  86
  87 ?>