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         require_once "config.php";
  13         require_once "autoload.php";
  14         require_once "functions.php";
  15
  16         // defaults
  17         define_default('PURGE_INTERVAL', 3600); // seconds
  18         define_default('MAX_CHILD_RUNTIME', 1800); // seconds
  19         define_default('MAX_JOBS', 2);
  20         define_default('SPAWN_INTERVAL', DAEMON_SLEEP_INTERVAL); // seconds
  21         define_default('DAEMON_FEED_LIMIT', 250);
  22
  23         require_once "rssfuncs.php";
  24         require_once "sanity_check.php";
  25         require_once "db.php";
  26         require_once "db-prefs.php";
  27
  28
  29         if (!function_exists('pcntl_fork')) {
  30                 die("error: This script requires PHP compiled with PCNTL module.\n");
  31         }
  32
  33         $master_handlers_installed = false;
  34
  35         $children = array();
  36         $ctimes = array();
  37
  38         $last_checkpoint = -1;
  39
  40         function reap_children() {
  41                 global $children;
  42                 global $ctimes;
  43
  44                 $tmp = array();
  45
  46                 foreach ($children as $pid) {
  47                         if (pcntl_waitpid($pid, $status, WNOHANG) != $pid) {
  48
  49                                 if (file_is_locked("update_daemon-$pid.lock")) {
  50                                         array_push($tmp, $pid);
  51                                 } else {
  52                                         _debug("[reap_children] child $pid seems active but lockfile is unlocked.");
  53                                         unset($ctimes[$pid]);
  54
  55                                 }
  56                         } else {
  57                                 _debug("[reap_children] child $pid reaped.");
  58                                 unset($ctimes[$pid]);
  59                         }
  60                 }
  61
  62                 $children = $tmp;
  63
  64                 return count($tmp);
  65         }
  66
  67         function check_ctimes() {
  68                 global $ctimes;
  69
  70                 foreach (array_keys($ctimes) as $pid) {
  71                         $started = $ctimes[$pid];
  72
  73                         if (time() - $started > MAX_CHILD_RUNTIME) {
  74                                 _debug("[MASTER] child process $pid seems to be stuck, aborting...");
  75                                 posix_kill($pid, SIGKILL);
  76                         }
  77                 }
  78         }
  79
  80         function sigchld_handler($signal) {
  81                 $running_jobs = reap_children();
  82
  83                 _debug("[SIGCHLD] jobs left: $running_jobs");
  84
  85                 pcntl_waitpid(-1, $status, WNOHANG);
  86         }
  87
  88         function shutdown($caller_pid) {
  89                 if ($caller_pid == posix_getpid()) {
  90                         if (file_exists(LOCK_DIRECTORY . "/update_daemon.lock")) {
  91                                 _debug("removing lockfile (master)...");
  92                                 unlink(LOCK_DIRECTORY . "/update_daemon.lock");
  93                         }
  94                 }
  95         }
  96
  97         function task_shutdown() {
  98                 $pid = posix_getpid();
  99
 100                 if (file_exists(LOCK_DIRECTORY . "/update_daemon-$pid.lock")) {
 101                         _debug("removing lockfile ($pid)...");
 102                         unlink(LOCK_DIRECTORY . "/update_daemon-$pid.lock");
 103                 }
 104         }
 105
 106         function sigint_handler() {
 107                 _debug("[MASTER] SIG_INT received.\n");
 108                 shutdown(posix_getpid());
 109                 die;
 110         }
 111
 112         function task_sigint_handler() {
 113                 _debug("[TASK] SIG_INT received.\n");
 114                 task_shutdown();
 115                 die;
 116         }
 117
 118         pcntl_signal(SIGCHLD, 'sigchld_handler');
 119
 120         $longopts = array("log:",
 121                         "tasks:",
 122                         "interval:",
 123                         "quiet",
 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 = $options["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 = $options["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         init_plugins();
 175
 176         $schema_version = get_schema_version();
 177
 178         if ($schema_version != SCHEMA_VERSION) {
 179                 die("Schema version is wrong, please upgrade the database.\n");
 180         }
 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 % 60 == 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 if schema version changed */
 196
 197                         $test_schema_version = get_schema_version();
 198
 199                         if ($test_schema_version != $schema_version) {
 200                                 echo "Expected schema version: $schema_version, got: $test_schema_version\n";
 201                                 echo "Schema version changed while we were running, bailing out\n";
 202                                 exit(100);
 203                         }
 204
 205                         check_ctimes();
 206                         reap_children();
 207
 208                         for ($j = count($children); $j < $max_jobs; $j++) {
 209                                 $pid = pcntl_fork();
 210                                 if ($pid == -1) {
 211                                         die("fork failed!\n");
 212                                 } else if ($pid) {
 213
 214                                         if (!$master_handlers_installed) {
 215                                                 _debug("[MASTER] installing shutdown handlers");
 216                                                 pcntl_signal(SIGINT, 'sigint_handler');
 217                                                 register_shutdown_function('shutdown', posix_getpid());
 218                                                 $master_handlers_installed = true;
 219                                         }
 220
 221                                         _debug("[MASTER] spawned client $j [PID:$pid]...");
 222                                         array_push($children, $pid);
 223                                         $ctimes[$pid] = time();
 224                                 } else {
 225                                         pcntl_signal(SIGCHLD, SIG_IGN);
 226                                         pcntl_signal(SIGINT, 'task_sigint_handler');
 227
 228                                         register_shutdown_function('task_shutdown');
 229
 230                                         $quiet = (isset($options["quiet"])) ? "--quiet" : "";
 231
 232                                         $my_pid = posix_getpid();
 233
 234                                         passthru(PHP_EXECUTABLE . " update.php --daemon-loop $quiet --task $j --pidlock $my_pid");
 235
 236                                         sleep(1);
 237
 238                                         // We exit in order to avoid fork bombing.
 239                                         exit(0);
 240                                 }
 241                         }
 242                         $last_checkpoint = time();
 243                 }
 244                 sleep(1);
 245         }
 246
 247 ?>