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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 | // 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('DISABLE_SESSIONS', true); | |
12 | ||
13 | require_once "version.php"; | |
14 | ||
15 | if (strpos(VERSION, ".99") !== false || getenv('DAEMON_XDEBUG')) { | |
16 | define('DAEMON_EXTENDED_DEBUG', true); | |
17 | } | |
18 | ||
19 | define('PURGE_INTERVAL', 3600); // seconds | |
20 | define('MAX_CHILD_RUNTIME', 600); // seconds | |
21 | ||
22 | require_once "sanity_check.php"; | |
23 | require_once "config.php"; | |
24 | ||
25 | define('MAX_JOBS', 2); | |
26 | define('SPAWN_INTERVAL', DAEMON_SLEEP_INTERVAL); | |
27 | ||
28 | if (!function_exists('pcntl_fork')) { | |
29 | die("error: This script requires PHP compiled with PCNTL module.\n"); | |
30 | } | |
31 | ||
32 | if (!ENABLE_UPDATE_DAEMON) { | |
33 | die("error: Please enable option ENABLE_UPDATE_DAEMON in config.php\n"); | |
34 | } | |
35 | ||
36 | require_once "db.php"; | |
37 | require_once "db-prefs.php"; | |
38 | require_once "functions.php"; | |
39 | require_once "lib/magpierss/rss_fetch.inc"; | |
40 | ||
41 | error_reporting(DEFAULT_ERROR_LEVEL); | |
42 | ||
43 | $children = array(); | |
44 | $ctimes = array(); | |
45 | ||
46 | $last_checkpoint = -1; | |
47 | ||
48 | function reap_children() { | |
49 | global $children; | |
50 | global $ctimes; | |
51 | ||
52 | $tmp = array(); | |
53 | ||
54 | foreach ($children as $pid) { | |
55 | if (pcntl_waitpid($pid, $status, WNOHANG) != $pid) { | |
56 | ||
57 | if (file_is_locked("update_daemon-$pid.lock")) { | |
58 | array_push($tmp, $pid); | |
59 | } else { | |
60 | _debug("[reap_children] child $pid seems active but lockfile is unlocked."); | |
61 | } | |
62 | } else { | |
63 | _debug("[reap_children] child $pid reaped."); | |
64 | unset($ctimes[$pid]); | |
65 | } | |
66 | } | |
67 | ||
68 | $children = $tmp; | |
69 | ||
70 | return count($tmp); | |
71 | } | |
72 | ||
73 | function check_ctimes() { | |
74 | global $ctimes; | |
75 | ||
76 | foreach (array_keys($ctimes) as $pid) { | |
77 | $started = $ctimes[$pid]; | |
78 | ||
79 | if (time() - $started > MAX_CHILD_RUNTIME) { | |
80 | _debug("[MASTER] child process $pid seems to be stuck, aborting..."); | |
81 | posix_kill($pid, SIGKILL); | |
82 | } | |
83 | } | |
84 | } | |
85 | ||
86 | function sigchld_handler($signal) { | |
87 | $running_jobs = reap_children(); | |
88 | ||
89 | _debug("[SIGCHLD] jobs left: $running_jobs"); | |
90 | ||
91 | pcntl_waitpid(-1, $status, WNOHANG); | |
92 | } | |
93 | ||
94 | function shutdown() { | |
95 | if (file_exists(LOCK_DIRECTORY . "/update_daemon.lock")) | |
96 | unlink(LOCK_DIRECTORY . "/update_daemon.lock"); | |
97 | } | |
98 | ||
99 | function task_shutdown() { | |
100 | $pid = posix_getpid(); | |
101 | ||
102 | if (file_exists(LOCK_DIRECTORY . "/update_daemon-$pid.lock")) | |
103 | unlink(LOCK_DIRECTORY . "/update_daemon-$pid.lock"); | |
104 | } | |
105 | ||
106 | function sigint_handler() { | |
107 | shutdown(); | |
108 | die("[SIGINT] removing lockfile and exiting.\n"); | |
109 | } | |
110 | ||
111 | function task_sigint_handler() { | |
112 | task_shutdown(); | |
113 | die("[SIGINT] removing lockfile and exiting.\n"); | |
114 | } | |
115 | ||
116 | pcntl_signal(SIGCHLD, 'sigchld_handler'); | |
117 | ||
118 | if (file_is_locked("update_daemon.lock")) { | |
119 | die("error: Can't create lockfile. ". | |
120 | "Maybe another daemon is already running.\n"); | |
121 | } | |
122 | ||
123 | if (!pcntl_fork()) { | |
124 | pcntl_signal(SIGINT, 'sigint_handler'); | |
125 | register_shutdown_function('shutdown'); | |
126 | ||
127 | // Try to lock a file in order to avoid concurrent update. | |
128 | $lock_handle = make_lockfile("update_daemon.lock"); | |
129 | ||
130 | if (!$lock_handle) { | |
131 | die("error: Can't create lockfile. ". | |
132 | "Maybe another daemon is already running.\n"); | |
133 | } | |
134 | ||
135 | while (true) { sleep(100); } | |
136 | } | |
137 | ||
138 | // Testing database connection. | |
139 | // It is unnecessary to start the fork loop if database is not ok. | |
140 | $link = db_connect(DB_HOST, DB_USER, DB_PASS, DB_NAME); | |
141 | ||
142 | if (!$link) { | |
143 | if (DB_TYPE == "mysql") { | |
144 | print mysql_error(); | |
145 | } | |
146 | // PG seems to display its own errors just fine by default. | |
147 | return; | |
148 | } | |
149 | ||
150 | db_close($link); | |
151 | ||
152 | while (true) { | |
153 | ||
154 | // Since sleep is interupted by SIGCHLD, we need another way to | |
155 | // respect the SPAWN_INTERVAL | |
156 | $next_spawn = $last_checkpoint + SPAWN_INTERVAL - time(); | |
157 | ||
158 | if ($next_spawn % 10 == 0) { | |
159 | $running_jobs = count($children); | |
160 | _debug("[MASTER] active jobs: $running_jobs, next spawn at $next_spawn sec."); | |
161 | } | |
162 | ||
163 | if ($last_checkpoint + SPAWN_INTERVAL < time()) { | |
164 | ||
165 | check_ctimes(); | |
166 | reap_children(); | |
167 | ||
168 | for ($j = count($children); $j < MAX_JOBS; $j++) { | |
169 | $pid = pcntl_fork(); | |
170 | if ($pid == -1) { | |
171 | die("fork failed!\n"); | |
172 | } else if ($pid) { | |
173 | _debug("[MASTER] spawned client $j [PID:$pid]..."); | |
174 | array_push($children, $pid); | |
175 | $ctimes[$pid] = time(); | |
176 | } else { | |
177 | pcntl_signal(SIGCHLD, SIG_IGN); | |
178 | pcntl_signal(SIGINT, 'task_sigint_handler'); | |
179 | ||
180 | register_shutdown_function('task_shutdown'); | |
181 | ||
182 | $my_pid = posix_getpid(); | |
183 | $lock_filename = "update_daemon-$my_pid.lock"; | |
184 | ||
185 | $lock_handle = make_lockfile($lock_filename); | |
186 | ||
187 | if (!$lock_handle) { | |
188 | die("error: Can't create lockfile ($lock_filename). ". | |
189 | "Maybe another daemon is already running.\n"); | |
190 | } | |
191 | ||
192 | // ****** Updating RSS code ******* | |
193 | // Only run in fork process. | |
194 | ||
195 | $start_timestamp = time(); | |
196 | ||
197 | $link = db_connect(DB_HOST, DB_USER, DB_PASS, DB_NAME); | |
198 | ||
199 | if (!$link) { | |
200 | if (DB_TYPE == "mysql") { | |
201 | print mysql_error(); | |
202 | } | |
203 | // PG seems to display its own errors just fine by default. | |
204 | return; | |
205 | } | |
206 | ||
207 | init_connection($link); | |
208 | ||
209 | // We disable stamp file, since it is of no use in a multiprocess update. | |
210 | // not really, tho for the time being -fox | |
211 | if (!make_stampfile('update_daemon.stamp')) { | |
212 | print "warning: unable to create stampfile"; | |
213 | } | |
214 | ||
215 | // Call to the feed batch update function | |
216 | // or regenerate feedbrowser cache | |
217 | ||
218 | if (rand(0,100) > 30) { | |
219 | update_daemon_common($link); | |
220 | } else { | |
221 | $count = update_feedbrowser_cache($link); | |
222 | _debug("Finished, $count feeds processed."); | |
223 | } | |
224 | ||
225 | _debug("Elapsed time: " . (time() - $start_timestamp) . " second(s)"); | |
226 | ||
227 | db_close($link); | |
228 | ||
229 | // We are in a fork. | |
230 | // We wait a little before exiting to avoid to be faster than our parent process. | |
231 | sleep(1); | |
232 | ||
233 | unlink(LOCK_DIRECTORY . "/$lock_filename"); | |
234 | ||
235 | // We exit in order to avoid fork bombing. | |
236 | exit(0); | |
237 | } | |
238 | ||
239 | // We wait a little time before the next fork, in order to let the first fork | |
240 | // mark the feeds it update : | |
241 | sleep(1); | |
242 | } | |
243 | $last_checkpoint = time(); | |
244 | } | |
245 | sleep(1); | |
246 | } | |
247 | ||
248 | ?> |