update_daemon2.php

   1 #!/usr/bin/php
   2 <?php
   3         // This is an experimental multiprocess update daemon.
   4         // Some configurable variable may be found below.
   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('MAGPIE_CACHE_DIR', '/var/tmp/magpie-ttrss-cache-daemon');
  12         define('SIMPLEPIE_CACHE_DIR',   '/var/tmp/simplepie-ttrss-cache-daemon');
  13         define('DISABLE_SESSIONS', true);
  14
  15         require_once "version.php";
  16
  17         if (strpos(VERSION, ".99") !== false || getenv('DAEMON_XDEBUG')) {
  18                 define('DAEMON_EXTENDED_DEBUG', true);
  19         }
  20
  21         define('PURGE_INTERVAL', 3600); // seconds
  22
  23         require_once "sanity_check.php";
  24         require_once "config.php";
  25
  26         define('MAX_JOBS', 2);
  27
  28         define('SPAWN_INTERVAL', DAEMON_SLEEP_INTERVAL);
  29
  30         if (!ENABLE_UPDATE_DAEMON) {
  31                 die("Please enable option ENABLE_UPDATE_DAEMON in config.php\n");
  32         }
  33
  34         require_once "db.php";
  35         require_once "db-prefs.php";
  36         require_once "functions.php";
  37         require_once "lib/magpierss/rss_fetch.inc";
  38
  39         error_reporting(DEFAULT_ERROR_LEVEL);
  40
  41         $children = array();
  42
  43         $last_checkpoint = -1;
  44
  45         function reap_children() {
  46                 global $children;
  47
  48                 $tmp = array();
  49
  50                 foreach ($children as $pid) {
  51                         if (pcntl_waitpid($pid, $status, WNOHANG) != $pid) {
  52                                 array_push($tmp, $pid);
  53                         } else {
  54                                 _debug("[SIGCHLD] child $pid reaped.");
  55                         }
  56                 }
  57
  58                 $children = $tmp;
  59
  60                 return count($tmp);
  61         }
  62
  63         function sigalrm_handler() {
  64                 die("[SIGALRM] hang in feed update?\n");
  65         }
  66
  67         function sigchld_handler($signal) {
  68                 $running_jobs = reap_children();
  69
  70                 _debug("[SIGCHLD] jobs left: $running_jobs");
  71
  72                 pcntl_waitpid(-1, $status, WNOHANG);
  73         }
  74
  75         function sigint_handler() {
  76                 unlink(LOCK_DIRECTORY . "/update_daemon.lock");
  77                 die("[SIGINT] removing lockfile and exiting.\n");
  78         }
  79
  80         pcntl_signal(SIGALRM, 'sigalrm_handler');
  81         pcntl_signal(SIGCHLD, 'sigchld_handler');
  82
  83         if (file_is_locked("update_daemon.lock")) {
  84                 die("error: Can't create lockfile. ".
  85                         "Maybe another daemon is already running.\n");
  86         }
  87
  88         if (!pcntl_fork()) {
  89                 pcntl_signal(SIGINT, 'sigint_handler');
  90
  91                 // Try to lock a file in order to avoid concurrent update.
  92                 $lock_handle = make_lockfile("update_daemon.lock");
  93
  94                 if (!$lock_handle) {
  95                         die("error: Can't create lockfile. ".
  96                                 "Maybe another daemon is already running.\n");
  97                 }
  98
  99                 while (true) { sleep(100); }
 100         }
 101
 102         // Testing database connection.
 103         // It is unnecessary to start the fork loop if database is not ok.
 104         $link = db_connect(DB_HOST, DB_USER, DB_PASS, DB_NAME);
 105
 106         if (!$link) {
 107                 if (DB_TYPE == "mysql") {
 108                         print mysql_error();
 109                 }
 110                 // PG seems to display its own errors just fine by default.
 111                 return;
 112         }
 113
 114         db_close($link);
 115
 116         while (true) {
 117
 118                 // Since sleep is interupted by SIGCHLD, we need another way to
 119                 // respect the SPAWN_INTERVAL
 120                 $next_spawn = $last_checkpoint + SPAWN_INTERVAL - time();
 121
 122                 if ($next_spawn % 10 == 0) {
 123                         $running_jobs = count($children);
 124                         _debug("[MASTER] active jobs: $running_jobs, next spawn at $next_spawn sec.");
 125                 }
 126
 127                 if ($last_checkpoint + SPAWN_INTERVAL < time()) {
 128
 129                         reap_children();
 130
 131                         for ($j = count($children); $j < MAX_JOBS; $j++) {
 132                                 $pid = pcntl_fork();
 133                                 if ($pid == -1) {
 134                                         die("fork failed!\n");
 135                                 } else if ($pid) {
 136                                         _debug("[MASTER] spawned client $j [PID:$pid]...");
 137                                         array_push($children, $pid);
 138                                 } else {
 139                                         pcntl_signal(SIGCHLD, SIG_IGN);
 140                                         pcntl_signal(SIGINT, SIG_DFL);
 141
 142                                         // ****** Updating RSS code *******
 143                                         // Only run in fork process.
 144
 145                                         $start_timestamp = time();
 146
 147                                         $link = db_connect(DB_HOST, DB_USER, DB_PASS, DB_NAME);
 148
 149                                         if (!$link) {
 150                                                 if (DB_TYPE == "mysql") {
 151                                                         print mysql_error();
 152                                                 }
 153                                                 // PG seems to display its own errors just fine by default.
 154                                                 return;
 155                                         }
 156
 157                                         init_connection($link);
 158
 159                                         // We disable stamp file, since it is of no use in a multiprocess update.
 160                                         // not really, tho for the time being -fox
 161                                         if (!make_stampfile('update_daemon.stamp')) {
 162                                                 print "warning: unable to create stampfile";
 163                                         }
 164
 165                                         // FIXME : $last_purge is of no use in a multiprocess update.
 166                                         // FIXME : We ALWAYS purge old posts.
 167                                         //_debug("Purging old posts (random 30 feeds)...");
 168                                         //global_purge_old_posts($link, true, 30);
 169
 170                                         // Call to the feed batch update function
 171                                         // or regenerate feedbrowser cache
 172
 173                                         if (rand(0,100) > 50) {
 174                                                 update_daemon_common($link);
 175                                         } else {
 176                                                 $count = update_feedbrowser_cache($link);
 177                                                 _debug("Finished, $count feeds processed.");
 178                                         }
 179
 180                                         _debug("Elapsed time: " . (time() - $start_timestamp) . " second(s)");
 181
 182                                         db_close($link);
 183
 184                                         // We are in a fork.
 185                                         // We wait a little before exiting to avoid to be faster than our parent process.
 186                                         sleep(1);
 187                                         // We exit in order to avoid fork bombing.
 188                                         exit(0);
 189                                 }
 190
 191                                 // We wait a little time before the next fork, in order to let the first fork
 192                                 // mark the feeds it update :
 193                                 sleep(1);
 194                         }
 195                         $last_checkpoint = time();
 196                 }
 197                 sleep(1);
 198         }
 199
 200 ?>