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1 | #!/usr/bin/php | |
2 | <?php | |
3 | // This is an experimental multiprocess update daemon. | |
4 | // Some configurable variable may be found below. | |
5 | ||
6 | declare(ticks = 1); | |
7 | ||
8 | define('DISABLE_SESSIONS', true); | |
9 | ||
10 | require_once "version.php"; | |
11 | ||
12 | if (strpos(VERSION, ".99") !== false || getenv('DAEMON_XDEBUG')) { | |
13 | define('DAEMON_EXTENDED_DEBUG', true); | |
14 | } | |
15 | ||
16 | define('PURGE_INTERVAL', 3600); // seconds | |
17 | define('MAX_CHILD_RUNTIME', 600); // seconds | |
18 | ||
19 | require_once "sanity_check.php"; | |
20 | require_once "config.php"; | |
21 | ||
22 | define('MAX_JOBS', 2); | |
23 | define('SPAWN_INTERVAL', DAEMON_SLEEP_INTERVAL); | |
24 | ||
25 | if (!function_exists('pcntl_fork')) { | |
26 | die("error: This script requires PHP compiled with PCNTL module.\n"); | |
27 | } | |
28 | ||
29 | require_once "db.php"; | |
30 | require_once "db-prefs.php"; | |
31 | require_once "functions.php"; | |
32 | require_once "lib/magpierss/rss_fetch.inc"; | |
33 | ||
34 | $children = array(); | |
35 | $ctimes = array(); | |
36 | ||
37 | $last_checkpoint = -1; | |
38 | ||
39 | function reap_children() { | |
40 | global $children; | |
41 | global $ctimes; | |
42 | ||
43 | $tmp = array(); | |
44 | ||
45 | foreach ($children as $pid) { | |
46 | if (pcntl_waitpid($pid, $status, WNOHANG) != $pid) { | |
47 | ||
48 | if (file_is_locked("update_daemon-$pid.lock")) { | |
49 | array_push($tmp, $pid); | |
50 | } else { | |
51 | _debug("[reap_children] child $pid seems active but lockfile is unlocked."); | |
52 | } | |
53 | } else { | |
54 | _debug("[reap_children] child $pid reaped."); | |
55 | unset($ctimes[$pid]); | |
56 | } | |
57 | } | |
58 | ||
59 | $children = $tmp; | |
60 | ||
61 | return count($tmp); | |
62 | } | |
63 | ||
64 | function check_ctimes() { | |
65 | global $ctimes; | |
66 | ||
67 | foreach (array_keys($ctimes) as $pid) { | |
68 | $started = $ctimes[$pid]; | |
69 | ||
70 | if (time() - $started > MAX_CHILD_RUNTIME) { | |
71 | _debug("[MASTER] child process $pid seems to be stuck, aborting..."); | |
72 | posix_kill($pid, SIGKILL); | |
73 | } | |
74 | } | |
75 | } | |
76 | ||
77 | function sigchld_handler($signal) { | |
78 | $running_jobs = reap_children(); | |
79 | ||
80 | _debug("[SIGCHLD] jobs left: $running_jobs"); | |
81 | ||
82 | pcntl_waitpid(-1, $status, WNOHANG); | |
83 | } | |
84 | ||
85 | function shutdown() { | |
86 | if (file_exists(LOCK_DIRECTORY . "/update_daemon.lock")) | |
87 | unlink(LOCK_DIRECTORY . "/update_daemon.lock"); | |
88 | } | |
89 | ||
90 | function task_shutdown() { | |
91 | $pid = posix_getpid(); | |
92 | ||
93 | if (file_exists(LOCK_DIRECTORY . "/update_daemon-$pid.lock")) | |
94 | unlink(LOCK_DIRECTORY . "/update_daemon-$pid.lock"); | |
95 | } | |
96 | ||
97 | function sigint_handler() { | |
98 | shutdown(); | |
99 | die("[SIGINT] removing lockfile and exiting.\n"); | |
100 | } | |
101 | ||
102 | function task_sigint_handler() { | |
103 | task_shutdown(); | |
104 | die("[SIGINT] removing lockfile and exiting.\n"); | |
105 | } | |
106 | ||
107 | pcntl_signal(SIGCHLD, 'sigchld_handler'); | |
108 | ||
109 | if (file_is_locked("update_daemon.lock")) { | |
110 | die("error: Can't create lockfile. ". | |
111 | "Maybe another daemon is already running.\n"); | |
112 | } | |
113 | ||
114 | if (!pcntl_fork()) { | |
115 | pcntl_signal(SIGINT, 'sigint_handler'); | |
116 | register_shutdown_function('shutdown'); | |
117 | ||
118 | // Try to lock a file in order to avoid concurrent update. | |
119 | $lock_handle = make_lockfile("update_daemon.lock"); | |
120 | ||
121 | if (!$lock_handle) { | |
122 | die("error: Can't create lockfile. ". | |
123 | "Maybe another daemon is already running.\n"); | |
124 | } | |
125 | ||
126 | while (true) { sleep(100); } | |
127 | } | |
128 | ||
129 | // Testing database connection. | |
130 | // It is unnecessary to start the fork loop if database is not ok. | |
131 | $link = db_connect(DB_HOST, DB_USER, DB_PASS, DB_NAME); | |
132 | ||
133 | if (!$link) { | |
134 | if (DB_TYPE == "mysql") { | |
135 | print mysql_error(); | |
136 | } | |
137 | // PG seems to display its own errors just fine by default. | |
138 | return; | |
139 | } | |
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 | $link = db_connect(DB_HOST, DB_USER, DB_PASS, DB_NAME); | |
189 | ||
190 | if (!$link) { | |
191 | if (DB_TYPE == "mysql") { | |
192 | print mysql_error(); | |
193 | } | |
194 | // PG seems to display its own errors just fine by default. | |
195 | return; | |
196 | } | |
197 | ||
198 | init_connection($link); | |
199 | ||
200 | // We disable stamp file, since it is of no use in a multiprocess update. | |
201 | // not really, tho for the time being -fox | |
202 | if (!make_stampfile('update_daemon.stamp')) { | |
203 | print "warning: unable to create stampfile"; | |
204 | } | |
205 | ||
206 | // Call to the feed batch update function | |
207 | // or regenerate feedbrowser cache | |
208 | ||
209 | if (rand(0,100) > 30) { | |
210 | update_daemon_common($link); | |
211 | } else { | |
212 | $count = update_feedbrowser_cache($link); | |
213 | _debug("Feedbrowser updated, $count feeds processed."); | |
214 | ||
215 | purge_orphans($link, true); | |
216 | ||
217 | $rc = cleanup_tags($link, 14, 50000); | |
218 | ||
219 | _debug("Cleaned $rc cached tags."); | |
220 | ||
221 | } | |
222 | ||
223 | _debug("Elapsed time: " . (time() - $start_timestamp) . " second(s)"); | |
224 | ||
225 | db_close($link); | |
226 | ||
227 | // We are in a fork. | |
228 | // We wait a little before exiting to avoid to be faster than our parent process. | |
229 | sleep(1); | |
230 | ||
231 | unlink(LOCK_DIRECTORY . "/$lock_filename"); | |
232 | ||
233 | // We exit in order to avoid fork bombing. | |
234 | exit(0); | |
235 | } | |
236 | ||
237 | // We wait a little time before the next fork, in order to let the first fork | |
238 | // mark the feeds it update : | |
239 | sleep(1); | |
240 | } | |
241 | $last_checkpoint = time(); | |
242 | } | |
243 | sleep(1); | |
244 | } | |
245 | ||
246 | ?> |