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         define('MAX_JOBS', 2);
  16
  17         require_once "version.php";
  18
  19         if (strpos(VERSION, ".99") !== false || getenv('DAEMON_XDEBUG')) {
  20                 define('DAEMON_EXTENDED_DEBUG', true);
  21         }
  22
  23         define('PURGE_INTERVAL', 3600); // seconds
  24
  25         require_once "sanity_check.php";
  26         require_once "config.php";
  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 "magpierss/rss_fetch.inc";
  38
  39         error_reporting(DEFAULT_ERROR_LEVEL);
  40
  41         $children = array();
  42
  43         $last_checkpoint = -1;
  44
  45         function sigalrm_handler() {
  46                 die("received SIGALRM, hang in feed update?\n");
  47         }
  48
  49         function sigchld_handler($signal) {
  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                 $running_jobs = count($children);
  65
  66                 _debug("[SIGCHLD] jobs left: $running_jobs");
  67                 pcntl_waitpid(-1, $status, WNOHANG);
  68         }
  69
  70         function sigint_handler() {
  71                 unlink(LOCK_DIRECTORY . "/update_daemon.lock");
  72                 die("Received SIGINT. Exiting.\n");
  73         }
  74
  75         pcntl_signal(SIGALRM, 'sigalrm_handler');
  76         pcntl_signal(SIGCHLD, 'sigchld_handler');
  77         pcntl_signal(SIGINT, 'sigint_handler');
  78
  79         if (file_is_locked("update_daemon.lock")) {
  80                 die("error: Can't create lockfile. ".
  81                         "Maybe another daemon is already running.\n");
  82         }
  83
  84         if (file_is_locked("update_daemon.lock")) {
  85                 die("error: Can't create lockfile. ".
  86                         "Maybe another daemon is already running.\n");
  87         }
  88
  89         if (!pcntl_fork()) {
  90                 $lock_handle = make_lockfile("update_daemon.lock");
  91
  92                 if (!$lock_handle) {
  93                         die("error: Can't create lockfile. ".
  94                                 "Maybe another daemon is already running.\n");
  95                 }
  96
  97                 while (true) { sleep(100); }
  98         }
  99
 100         // Testing database connection.
 101         // It is unnecessary to start the fork loop if database is not ok.
 102         $link = db_connect(DB_HOST, DB_USER, DB_PASS, DB_NAME);
 103
 104         if (!$link) {
 105                 if (DB_TYPE == "mysql") {
 106                         print mysql_error();
 107                 }
 108                 // PG seems to display its own errors just fine by default.
 109                 return;
 110         }
 111
 112         db_close($link);
 113
 114
 115         while (true) {
 116
 117                 $next_spawn = $last_checkpoint + SPAWN_INTERVAL - time();
 118
 119                 if ($next_spawn % 10 == 0) {
 120                         $running_jobs = count($children);
 121                         _debug("[MASTER] active jobs: $running_jobs, next spawn at $next_spawn sec.");
 122                 }
 123
 124                 if ($last_checkpoint + SPAWN_INTERVAL < time()) {
 125
 126                         for ($j = count($children); $j < MAX_JOBS; $j++) {
 127                                 $pid = pcntl_fork();
 128                                 if ($pid == -1) {
 129                                         die("fork failed!\n");
 130                                 } else if ($pid) {
 131                                         _debug("[MASTER] spawned client $j [PID:$pid]...");
 132                                         array_push($children, $pid);
 133                                 } else {
 134                                         pcntl_signal(SIGCHLD, SIG_IGN);
 135                                         pcntl_signal(SIGINT, SIG_DFL);
 136
 137                                         // ****** Updating RSS code *******
 138                                         // Only run in fork process.
 139
 140                                         $start_timestamp = time();
 141
 142                                         $link = db_connect(DB_HOST, DB_USER, DB_PASS, DB_NAME);
 143
 144                                         if (!$link) {
 145                                                 if (DB_TYPE == "mysql") {
 146                                                         print mysql_error();
 147                                                 }
 148                                                 // PG seems to display its own errors just fine by default.
 149                                                 return;
 150                                         }
 151
 152                                         if (DB_TYPE == "pgsql") {
 153                                                 pg_query("set client_encoding = 'utf-8'");
 154                                                 pg_set_client_encoding("UNICODE");
 155                                         } else {
 156                                                 if (defined('MYSQL_CHARSET') && MYSQL_CHARSET) {
 157                                                         db_query($link, "SET NAMES " . MYSQL_CHARSET);
 158                                                         // db_query($link, "SET CHARACTER SET " . MYSQL_CHARSET);
 159                                                 }
 160                                         }
 161
 162                                         // We disable stamp file, since it is of no use in a multiprocess update.
 163                                         // not really, tho for the time being -fox
 164                                         if (!make_stampfile('update_daemon.stamp')) {
 165                                                 print "warning: unable to create stampfile";
 166                                         }
 167
 168                                         // $last_purge = 0;
 169
 170                                         // if (time() - $last_purge > PURGE_INTERVAL) {
 171
 172                                         // FIXME : $last_purge is of no use in a multiprocess update.
 173                                         // FIXME : We ALWAYS purge old posts.
 174                                         _debug("Purging old posts (random 30 feeds)...");
 175                                         global_purge_old_posts($link, true, 30);
 176
 177                                         //      $last_purge = time();
 178                                         // }
 179
 180                                         // Process all other feeds using last_updated and interval parameters
 181
 182                                         $random_qpart = sql_random_function();
 183
 184                                         if (DAEMON_UPDATE_LOGIN_LIMIT > 0) {
 185                                                 if (DB_TYPE == "pgsql") {
 186                                                         $login_thresh_qpart = "AND ttrss_users.last_login >= NOW() - INTERVAL '".DAEMON_UPDATE_LOGIN_LIMIT." days'";
 187                                                 } else {
 188                                                         $login_thresh_qpart = "AND ttrss_users.last_login >= DATE_SUB(NOW(), INTERVAL ".DAEMON_UPDATE_LOGIN_LIMIT." DAY)";
 189                                                 }
 190                                         } else {
 191                                                 $login_thresh_qpart = "";
 192                                         }
 193
 194                                         if (DB_TYPE == "pgsql") {
 195                                                 $update_limit_qpart = "AND ttrss_feeds.last_updated < NOW() - INTERVAL '".(DAEMON_SLEEP_INTERVAL*2)." seconds'";
 196                                         } else {
 197                                                 $update_limit_qpart = "AND ttrss_feeds.last_updated < DATE_SUB(NOW(), INTERVAL ".(DAEMON_SLEEP_INTERVAL*2)." SECOND)";
 198                                         }
 199
 200                                         if (DB_TYPE == "pgsql") {
 201                                                         $updstart_thresh_qpart = "AND (ttrss_feeds.last_update_started IS NULL OR ttrss_feeds.last_update_started < NOW() - INTERVAL '120 seconds')";
 202                                                 } else {
 203                                                         $updstart_thresh_qpart = "AND (ttrss_feeds.last_update_started IS NULL OR ttrss_feeds.last_update_started < DATE_SUB(NOW(), INTERVAL 120 SECOND))";
 204                                                 }
 205
 206                                         $result = db_query($link, "SELECT feed_url,ttrss_feeds.id,owner_uid,
 207                                                         SUBSTRING(last_updated,1,19) AS last_updated,
 208                                                         update_interval
 209                                                 FROM
 210                                                         ttrss_feeds,ttrss_users
 211                                                 WHERE
 212                                                         ttrss_users.id = owner_uid $login_thresh_qpart $update_limit_qpart
 213                                                         $updstart_thresh_qpart
 214                                                 ORDER BY $random_qpart DESC LIMIT " . DAEMON_FEED_LIMIT);
 215
 216                                         $user_prefs_cache = array();
 217
 218                                         _debug(sprintf("Scheduled %d feeds to update...\n", db_num_rows($result)));
 219
 220                                         // Here is a little cache magic in order to minimize risk of double feed updates.
 221                                         $feeds_to_update = array();
 222                                         while ($line = db_fetch_assoc($result)) {
 223                                                 $feeds_to_update[$line['id']] = $line;
 224                                         }
 225
 226                                         // We update the feed last update started date before anything else.
 227                                         // There is no lag due to feed contents downloads
 228                                         // It prevent an other process to update the same feed.
 229                                         $feed_ids = array_keys($feeds_to_update);
 230                                         if($feed_ids) {
 231                                                 db_query($link, sprintf("UPDATE ttrss_feeds SET last_update_started = NOW()
 232                                                         WHERE id IN (%s)", implode(',', $feed_ids)));
 233                                         }
 234
 235                                         while ($line = array_pop($feeds_to_update)) {
 236
 237                                                 $upd_intl = $line["update_interval"];
 238                                                 $user_id = $line["owner_uid"];
 239
 240                                                 if (!$upd_intl || $upd_intl == 0) {
 241                                                         if (!$user_prefs_cache[$user_id]['DEFAULT_UPDATE_INTERVAL']) {
 242                                                                 $upd_intl = get_pref($link, 'DEFAULT_UPDATE_INTERVAL', $user_id);
 243                                                                 $user_prefs_cache[$user_id]['DEFAULT_UPDATE_INTERVAL'] = $upd_intl;
 244                                                         } else {
 245                                                                 $upd_intl = $user_prefs_cache[$user_id]['DEFAULT_UPDATE_INTERVAL'];
 246                                                         }
 247                                                 }
 248
 249                                                 if ($upd_intl < 0) {
 250                                 #                               print "Updates disabled.\n";
 251                                                         continue;
 252                                                 }
 253
 254                                                 _debug("Feed: " . $line["feed_url"] . ", " . $line["last_updated"]);
 255
 256                                 //                      _debug(sprintf("\tLU: %d, INTL: %d, UID: %d) ",
 257                                 //                              time() - strtotime($line["last_updated"]), $upd_intl*60, $user_id));
 258
 259                                                 if (!$line["last_updated"] ||
 260                                                         time() - strtotime($line["last_updated"]) > ($upd_intl * 60)) {
 261
 262                                                         _debug("Updating...");
 263
 264                                                         pcntl_alarm(300);
 265
 266                                                         update_rss_feed($link, $line["feed_url"], $line["id"], true);
 267
 268                                                         pcntl_alarm(0);
 269
 270                                                         sleep(1); // prevent flood (FIXME make this an option?)
 271                                                 } else {
 272                                                         _debug("Update not needed.");
 273                                                 }
 274                                         }
 275
 276                                         if (DAEMON_SENDS_DIGESTS) send_headlines_digests($link);
 277
 278                                         print "Elapsed time: " . (time() - $start_timestamp) . " second(s)\n";
 279
 280                                         db_close($link);
 281
 282                                         // We are in a fork.
 283                                         // We wait a little before exiting to avoid to be faster than our parent process.
 284                                         sleep(1);
 285                                         // We exit in order to avoid fork bombing.
 286                                         exit(0);
 287                                 }
 288                         }
 289                         $last_checkpoint = time();
 290                 }
 291                 sleep(1);
 292         }
 293
 294 ?>