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1 | #!/usr/bin/php | |
2 | <?php | |
3 | set_include_path(get_include_path() . PATH_SEPARATOR . | |
4 | dirname(__FILE__) . "/include"); | |
5 | ||
6 | // This is an experimental multiprocess update daemon. | |
7 | // Some configurable variable may be found below. | |
8 | ||
9 | declare(ticks = 1); | |
10 | chdir(dirname(__FILE__)); | |
11 | ||
12 | define('DISABLE_SESSIONS', true); | |
13 | ||
14 | require_once "version.php"; | |
15 | ||
16 | if (strpos(VERSION, ".99") !== false || getenv('DAEMON_XDEBUG')) { | |
17 | define('DAEMON_EXTENDED_DEBUG', true); | |
18 | } | |
19 | ||
20 | define('PURGE_INTERVAL', 3600); // seconds | |
21 | define('MAX_CHILD_RUNTIME', 600); // seconds | |
22 | ||
23 | require_once "sanity_check.php"; | |
24 | require_once "config.php"; | |
25 | require_once "db.php"; | |
26 | require_once "db-prefs.php"; | |
27 | require_once "functions.php"; | |
28 | require_once "rssfuncs.php"; | |
29 | require_once "lib/magpierss/rss_fetch.inc"; | |
30 | ||
31 | define('MAX_JOBS', 2); | |
32 | define('SPAWN_INTERVAL', DAEMON_SLEEP_INTERVAL); | |
33 | ||
34 | if (!function_exists('pcntl_fork')) { | |
35 | die("error: This script requires PHP compiled with PCNTL module.\n"); | |
36 | } | |
37 | ||
38 | $children = array(); | |
39 | $ctimes = array(); | |
40 | ||
41 | $last_checkpoint = -1; | |
42 | ||
43 | function reap_children() { | |
44 | global $children; | |
45 | global $ctimes; | |
46 | ||
47 | $tmp = array(); | |
48 | ||
49 | foreach ($children as $pid) { | |
50 | if (pcntl_waitpid($pid, $status, WNOHANG) != $pid) { | |
51 | ||
52 | if (file_is_locked("update_daemon-$pid.lock")) { | |
53 | array_push($tmp, $pid); | |
54 | } else { | |
55 | _debug("[reap_children] child $pid seems active but lockfile is unlocked."); | |
56 | unset($ctimes[$pid]); | |
57 | ||
58 | } | |
59 | } else { | |
60 | _debug("[reap_children] child $pid reaped."); | |
61 | unset($ctimes[$pid]); | |
62 | } | |
63 | } | |
64 | ||
65 | $children = $tmp; | |
66 | ||
67 | return count($tmp); | |
68 | } | |
69 | ||
70 | function check_ctimes() { | |
71 | global $ctimes; | |
72 | ||
73 | foreach (array_keys($ctimes) as $pid) { | |
74 | $started = $ctimes[$pid]; | |
75 | ||
76 | if (time() - $started > MAX_CHILD_RUNTIME) { | |
77 | _debug("[MASTER] child process $pid seems to be stuck, aborting..."); | |
78 | posix_kill($pid, SIGKILL); | |
79 | } | |
80 | } | |
81 | } | |
82 | ||
83 | function sigchld_handler($signal) { | |
84 | $running_jobs = reap_children(); | |
85 | ||
86 | _debug("[SIGCHLD] jobs left: $running_jobs"); | |
87 | ||
88 | pcntl_waitpid(-1, $status, WNOHANG); | |
89 | } | |
90 | ||
91 | function shutdown() { | |
92 | if (file_exists(LOCK_DIRECTORY . "/update_daemon.lock")) | |
93 | unlink(LOCK_DIRECTORY . "/update_daemon.lock"); | |
94 | } | |
95 | ||
96 | function task_shutdown() { | |
97 | $pid = posix_getpid(); | |
98 | ||
99 | if (file_exists(LOCK_DIRECTORY . "/update_daemon-$pid.lock")) | |
100 | unlink(LOCK_DIRECTORY . "/update_daemon-$pid.lock"); | |
101 | } | |
102 | ||
103 | function sigint_handler() { | |
104 | shutdown(); | |
105 | die("[SIGINT] removing lockfile and exiting.\n"); | |
106 | } | |
107 | ||
108 | function task_sigint_handler() { | |
109 | task_shutdown(); | |
110 | die("[SIGINT] removing lockfile and exiting.\n"); | |
111 | } | |
112 | ||
113 | pcntl_signal(SIGCHLD, 'sigchld_handler'); | |
114 | ||
115 | if (file_is_locked("update_daemon.lock")) { | |
116 | die("error: Can't create lockfile. ". | |
117 | "Maybe another daemon is already running.\n"); | |
118 | } | |
119 | ||
120 | if (!pcntl_fork()) { | |
121 | pcntl_signal(SIGINT, 'sigint_handler'); | |
122 | register_shutdown_function('shutdown'); | |
123 | ||
124 | // Try to lock a file in order to avoid concurrent update. | |
125 | $lock_handle = make_lockfile("update_daemon.lock"); | |
126 | ||
127 | if (!$lock_handle) { | |
128 | die("error: Can't create lockfile. ". | |
129 | "Maybe another daemon is already running.\n"); | |
130 | } | |
131 | ||
132 | while (true) { sleep(100); } | |
133 | } | |
134 | ||
135 | // Testing database connection. | |
136 | // It is unnecessary to start the fork loop if database is not ok. | |
137 | $link = db_connect(DB_HOST, DB_USER, DB_PASS, DB_NAME); | |
138 | ||
139 | if (!init_connection($link)) return; | |
140 | ||
141 | db_close($link); | |
142 | ||
143 | while (true) { | |
144 | ||
145 | // Since sleep is interupted by SIGCHLD, we need another way to | |
146 | // respect the SPAWN_INTERVAL | |
147 | $next_spawn = $last_checkpoint + SPAWN_INTERVAL - time(); | |
148 | ||
149 | if ($next_spawn % 10 == 0) { | |
150 | $running_jobs = count($children); | |
151 | _debug("[MASTER] active jobs: $running_jobs, next spawn at $next_spawn sec."); | |
152 | } | |
153 | ||
154 | if ($last_checkpoint + SPAWN_INTERVAL < time()) { | |
155 | ||
156 | check_ctimes(); | |
157 | reap_children(); | |
158 | ||
159 | for ($j = count($children); $j < MAX_JOBS; $j++) { | |
160 | $pid = pcntl_fork(); | |
161 | if ($pid == -1) { | |
162 | die("fork failed!\n"); | |
163 | } else if ($pid) { | |
164 | _debug("[MASTER] spawned client $j [PID:$pid]..."); | |
165 | array_push($children, $pid); | |
166 | $ctimes[$pid] = time(); | |
167 | } else { | |
168 | pcntl_signal(SIGCHLD, SIG_IGN); | |
169 | pcntl_signal(SIGINT, 'task_sigint_handler'); | |
170 | ||
171 | register_shutdown_function('task_shutdown'); | |
172 | ||
173 | $my_pid = posix_getpid(); | |
174 | $lock_filename = "update_daemon-$my_pid.lock"; | |
175 | ||
176 | $lock_handle = make_lockfile($lock_filename); | |
177 | ||
178 | if (!$lock_handle) { | |
179 | die("error: Can't create lockfile ($lock_filename). ". | |
180 | "Maybe another daemon is already running.\n"); | |
181 | } | |
182 | ||
183 | // ****** Updating RSS code ******* | |
184 | // Only run in fork process. | |
185 | ||
186 | $start_timestamp = time(); | |
187 | ||
188 | $link = db_connect(DB_HOST, DB_USER, DB_PASS, DB_NAME); | |
189 | ||
190 | if (!init_connection($link)) return; | |
191 | ||
192 | // We disable stamp file, since it is of no use in a multiprocess update. | |
193 | // not really, tho for the time being -fox | |
194 | if (!make_stampfile('update_daemon.stamp')) { | |
195 | print "warning: unable to create stampfile"; | |
196 | } | |
197 | ||
198 | // Call to the feed batch update function | |
199 | // or regenerate feedbrowser cache | |
200 | ||
201 | if (rand(0,100) > 30) { | |
202 | update_daemon_common($link); | |
203 | } else { | |
204 | $count = update_feedbrowser_cache($link); | |
205 | _debug("Feedbrowser updated, $count feeds processed."); | |
206 | ||
207 | purge_orphans($link, true); | |
208 | ||
209 | $rc = cleanup_tags($link, 14, 50000); | |
210 | ||
211 | _debug("Cleaned $rc cached tags."); | |
212 | ||
213 | _debug("Updating linked feeds..."); | |
214 | get_linked_feeds($link); | |
215 | ||
216 | } | |
217 | ||
218 | _debug("Elapsed time: " . (time() - $start_timestamp) . " second(s)"); | |
219 | ||
220 | db_close($link); | |
221 | ||
222 | // We are in a fork. | |
223 | // We wait a little before exiting to avoid to be faster than our parent process. | |
224 | sleep(1); | |
225 | ||
226 | unlink(LOCK_DIRECTORY . "/$lock_filename"); | |
227 | ||
228 | // We exit in order to avoid fork bombing. | |
229 | exit(0); | |
230 | } | |
231 | ||
232 | // We wait a little time before the next fork, in order to let the first fork | |
233 | // mark the feeds it update : | |
234 | sleep(1); | |
235 | } | |
236 | $last_checkpoint = time(); | |
237 | } | |
238 | sleep(1); | |
239 | } | |
240 | ||
241 | ?> |