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 (!function_exists('pcntl_fork')) {
  31                 die("error: This script requires PHP compiled with PCNTL module.\n");
  32         }
  33
  34         if (!ENABLE_UPDATE_DAEMON) {
  35                 die("error: Please enable option ENABLE_UPDATE_DAEMON in config.php\n");
  36         }
  37
  38         require_once "db.php";
  39         require_once "db-prefs.php";
  40         require_once "functions.php";
  41         require_once "lib/magpierss/rss_fetch.inc";
  42
  43         error_reporting(DEFAULT_ERROR_LEVEL);
  44
  45         $children = array();
  46
  47         $last_checkpoint = -1;
  48
  49         function reap_children() {
  50                 global $children;
  51
  52                 $tmp = array();
  53
  54                 foreach ($children as $pid) {
  55                         if (pcntl_waitpid($pid, $status, WNOHANG) != $pid) {
  56                                 array_push($tmp, $pid);
  57                         } else {
  58                                 _debug("[SIGCHLD] child $pid reaped.");
  59                         }
  60                 }
  61
  62                 $children = $tmp;
  63
  64                 return count($tmp);
  65         }
  66
  67         function sigalrm_handler() {
  68                 die("[SIGALRM] hang in feed update?\n");
  69         }
  70
  71         function sigchld_handler($signal) {
  72                 $running_jobs = reap_children();
  73
  74                 _debug("[SIGCHLD] jobs left: $running_jobs");
  75
  76                 pcntl_waitpid(-1, $status, WNOHANG);
  77         }
  78
  79         function sigint_handler() {
  80                 unlink(LOCK_DIRECTORY . "/update_daemon.lock");
  81                 die("[SIGINT] removing lockfile and exiting.\n");
  82         }
  83
  84         pcntl_signal(SIGALRM, 'sigalrm_handler');
  85         pcntl_signal(SIGCHLD, 'sigchld_handler');
  86
  87         if (file_is_locked("update_daemon.lock")) {
  88                 die("error: Can't create lockfile. ".
  89                         "Maybe another daemon is already running.\n");
  90         }
  91
  92         if (!pcntl_fork()) {
  93                 pcntl_signal(SIGINT, 'sigint_handler');
  94
  95                 // Try to lock a file in order to avoid concurrent update.
  96                 $lock_handle = make_lockfile("update_daemon.lock");
  97
  98                 if (!$lock_handle) {
  99                         die("error: Can't create lockfile. ".
 100                                 "Maybe another daemon is already running.\n");
 101                 }
 102
 103                 while (true) { sleep(100); }
 104         }
 105
 106         // Testing database connection.
 107         // It is unnecessary to start the fork loop if database is not ok.
 108         $link = db_connect(DB_HOST, DB_USER, DB_PASS, DB_NAME);
 109
 110         if (!$link) {
 111                 if (DB_TYPE == "mysql") {
 112                         print mysql_error();
 113                 }
 114                 // PG seems to display its own errors just fine by default.
 115                 return;
 116         }
 117
 118         db_close($link);
 119
 120         while (true) {
 121
 122                 // Since sleep is interupted by SIGCHLD, we need another way to
 123                 // respect the SPAWN_INTERVAL
 124                 $next_spawn = $last_checkpoint + SPAWN_INTERVAL - time();
 125
 126                 if ($next_spawn % 10 == 0) {
 127                         $running_jobs = count($children);
 128                         _debug("[MASTER] active jobs: $running_jobs, next spawn at $next_spawn sec.");
 129                 }
 130
 131                 if ($last_checkpoint + SPAWN_INTERVAL < time()) {
 132
 133                         reap_children();
 134
 135                         for ($j = count($children); $j < MAX_JOBS; $j++) {
 136                                 $pid = pcntl_fork();
 137                                 if ($pid == -1) {
 138                                         die("fork failed!\n");
 139                                 } else if ($pid) {
 140                                         _debug("[MASTER] spawned client $j [PID:$pid]...");
 141                                         array_push($children, $pid);
 142                                 } else {
 143                                         pcntl_signal(SIGCHLD, SIG_IGN);
 144                                         pcntl_signal(SIGINT, SIG_DFL);
 145
 146                                         // ****** Updating RSS code *******
 147                                         // Only run in fork process.
 148
 149                                         $start_timestamp = time();
 150
 151                                         $link = db_connect(DB_HOST, DB_USER, DB_PASS, DB_NAME);
 152
 153                                         if (!$link) {
 154                                                 if (DB_TYPE == "mysql") {
 155                                                         print mysql_error();
 156                                                 }
 157                                                 // PG seems to display its own errors just fine by default.
 158                                                 return;
 159                                         }
 160
 161                                         init_connection($link);
 162
 163                                         // We disable stamp file, since it is of no use in a multiprocess update.
 164                                         // not really, tho for the time being -fox
 165                                         if (!make_stampfile('update_daemon.stamp')) {
 166                                                 print "warning: unable to create stampfile";
 167                                         }
 168
 169                                         // FIXME : $last_purge is of no use in a multiprocess update.
 170                                         // FIXME : We ALWAYS purge old posts.
 171                                         //_debug("Purging old posts (random 30 feeds)...");
 172                                         //global_purge_old_posts($link, true, 30);
 173
 174                                         // Call to the feed batch update function
 175                                         // or regenerate feedbrowser cache
 176
 177                                         if (rand(0,100) > 50) {
 178                                                 update_daemon_common($link);
 179                                         } else {
 180                                                 $count = update_feedbrowser_cache($link);
 181                                                 _debug("Finished, $count feeds processed.");
 182                                         }
 183
 184                                         _debug("Elapsed time: " . (time() - $start_timestamp) . " second(s)");
 185
 186                                         db_close($link);
 187
 188                                         // We are in a fork.
 189                                         // We wait a little before exiting to avoid to be faster than our parent process.
 190                                         sleep(1);
 191                                         // We exit in order to avoid fork bombing.
 192                                         exit(0);
 193                                 }
 194
 195                                 // We wait a little time before the next fork, in order to let the first fork
 196                                 // mark the feeds it update :
 197                                 sleep(1);
 198                         }
 199                         $last_checkpoint = time();
 200                 }
 201                 sleep(1);
 202         }
 203
 204 ?>