chiark / gitweb /
fix syslog test
[disorder] / server / rescan.c
CommitLineData
460b9539 1/*
2 * This file is part of DisOrder
eb525fcd 3 * Copyright (C) 2005, 2006, 2007 Richard Kettlewell
460b9539 4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
18 * USA
19 */
20
21#include <config.h>
22#include "types.h"
23
24#include <getopt.h>
25#include <stdio.h>
26#include <stdlib.h>
27#include <db.h>
28#include <locale.h>
29#include <errno.h>
30#include <sys/types.h>
31#include <unistd.h>
32#include <pcre.h>
33#include <fnmatch.h>
34#include <sys/wait.h>
35#include <string.h>
36#include <syslog.h>
1e64e9fb 37#include <time.h>
460b9539 38
39#include "configuration.h"
40#include "syscalls.h"
41#include "log.h"
42#include "defs.h"
43#include "mem.h"
44#include "plugin.h"
45#include "inputline.h"
46#include "charset.h"
47#include "wstat.h"
48#include "kvp.h"
49#include "printf.h"
50#include "trackdb.h"
51#include "trackdb-int.h"
d1694464 52#include "trackname.h"
460b9539 53
54static DB_TXN *global_tid;
55
56static const struct option options[] = {
57 { "help", no_argument, 0, 'h' },
58 { "version", no_argument, 0, 'V' },
59 { "config", required_argument, 0, 'c' },
60 { "debug", no_argument, 0, 'd' },
61 { "no-debug", no_argument, 0, 'D' },
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RK
62 { "syslog", no_argument, 0, 's' },
63 { "no-syslog", no_argument, 0, 'S' },
460b9539 64 { 0, 0, 0, 0 }
65};
66
67/* display usage message and terminate */
68static void help(void) {
69 xprintf("Usage:\n"
70 " disorder-rescan [OPTIONS] [PATH...]\n"
71 "Options:\n"
72 " --help, -h Display usage message\n"
73 " --version, -V Display version number\n"
74 " --config PATH, -c PATH Set configuration file\n"
75 " --debug, -d Turn on debugging\n"
0ca6d097 76 " --[no-]syslog Force logging\n"
460b9539 77 "\n"
78 "Rescanner for DisOrder. Not intended to be run\n"
79 "directly.\n");
80 xfclose(stdout);
81 exit(0);
82}
83
84/* display version number and terminate */
85static void version(void) {
86 xprintf("disorder-rescan version %s\n", disorder_version_string);
87 xfclose(stdout);
88 exit(0);
89}
90
91static volatile sig_atomic_t signalled;
92
93static void signal_handler(int sig) {
94 if(sig == 0) _exit(-1); /* "Cannot happen" */
95 signalled = sig;
96}
97
98static int aborted(void) {
99 return signalled || getppid() == 1;
100}
101
102/* Exit if our parent has gone away or we have been told to stop. */
103static void checkabort(void) {
104 if(getppid() == 1) {
105 info("parent has terminated");
106 trackdb_abort_transaction(global_tid);
107 exit(0);
108 }
109 if(signalled) {
110 info("received signal %d", signalled);
111 trackdb_abort_transaction(global_tid);
112 exit(0);
113 }
114}
115
116/* rescan a collection */
117static void rescan_collection(const struct collection *c) {
118 pid_t pid, r;
119 int p[2], n, w;
120 FILE *fp = 0;
121 char *path, *track;
122 long ntracks = 0, nnew = 0;
123
124 checkabort();
125 info("rescanning %s with %s", c->root, c->module);
126 /* plugin runs in a subprocess */
127 xpipe(p);
128 if(!(pid = xfork())) {
129 exitfn = _exit;
130 xclose(p[0]);
131 xdup2(p[1], 1);
132 xclose(p[1]);
133 scan(c->module, c->root);
134 if(fflush(stdout) < 0)
135 fatal(errno, "error writing to scanner pipe");
136 _exit(0);
137 }
138 xclose(p[1]);
139 if(!(fp = fdopen(p[0], "r")))
140 fatal(errno, "error calling fdopen");
141 /* read tracks from the plugin */
142 while(!inputline("rescanner", fp, &path, 0)) {
143 checkabort();
144 /* actually we can cope relatively well within the server, but they'll go
145 * wrong in track listings */
146 if(strchr(path, '\n')) {
147 error(0, "cannot cope with tracks with newlines in the name");
148 continue;
149 }
150 if(!(track = any2utf8(c->encoding, path))) {
151 error(0, "cannot convert track path to UTF-8: %s", path);
152 continue;
153 }
154 D(("track %s", track));
155 /* only tracks with a known player are admitted */
156 for(n = 0; (n < config->player.n
157 && fnmatch(config->player.s[n].s[0], track, 0) != 0); ++n)
158 ;
159 if(n < config->player.n) {
160 nnew += !!trackdb_notice(track, path);
161 ++ntracks;
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RK
162 if(ntracks % 1000 == 0)
163 info("rescanning %s, %ld tracks so far", c->root, ntracks);
460b9539 164 }
165 }
166 /* tidy up */
167 if(ferror(fp)) {
168 error(errno, "error reading from scanner pipe");
169 goto done;
170 }
171 xfclose(fp);
172 fp = 0;
173 while((r = waitpid(pid, &w, 0)) == -1 && errno == EINTR)
174 ;
175 if(r < 0) fatal(errno, "error calling waitpid");
176 pid = 0;
177 if(w) {
178 error(0, "scanner subprocess: %s", wstat(w));
179 goto done;
180 }
181 info("rescanned %s, %ld tracks, %ld new", c->root, ntracks, nnew);
182done:
183 if(fp)
184 xfclose(fp);
185 if(pid)
186 while((r = waitpid(pid, &w, 0)) == -1 && errno == EINTR)
187 ;
188}
189
190struct recheck_state {
191 const struct collection *c;
d1694464 192 long nobsolete, nnocollection, nlength;
460b9539 193};
194
195/* called for each non-alias track */
196static int recheck_callback(const char *track,
197 struct kvp *data,
198 void *u,
199 DB_TXN *tid) {
200 struct recheck_state *cs = u;
201 const struct collection *c = cs->c;
202 const char *path = kvp_get(data, "_path");
203 char buffer[20];
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RK
204 int err, n;
205 long length;
460b9539 206
207 if(aborted()) return EINTR;
208 D(("rechecking %s", track));
d1694464 209 /* if we're not checking a specific collection, find the right collection */
210 if(!c) {
211 if(!(c = find_track_collection(track))) {
212 D(("obsoleting %s", track));
213 if((err = trackdb_obsolete(track, tid))) return err;
214 ++cs->nnocollection;
215 return 0;
216 }
217 }
460b9539 218 /* see if the track has evaporated */
219 if(check(c->module, c->root, path) == 0) {
220 D(("obsoleting %s", track));
221 if((err = trackdb_obsolete(track, tid))) return err;
222 ++cs->nobsolete;
223 return 0;
224 }
225 /* make sure we know the length */
226 if(!kvp_get(data, "_length")) {
227 D(("recalculating length of %s", track));
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RK
228 for(n = 0; n < config->tracklength.n; ++n)
229 if(fnmatch(config->tracklength.s[n].s[0], track, 0) == 0)
230 break;
231 if(n >= config->tracklength.n)
232 error(0, "no tracklength plugin found for %s", track);
233 else {
234 length = tracklength(config->tracklength.s[n].s[1], track, path);
235 if(length > 0) {
236 byte_snprintf(buffer, sizeof buffer, "%ld", length);
237 kvp_set(&data, "_length", buffer);
238 if((err = trackdb_putdata(trackdb_tracksdb, track, data, tid, 0)))
239 return err;
240 ++cs->nlength;
241 }
460b9539 242 }
243 }
244 return 0;
245}
246
247/* recheck a collection */
248static void recheck_collection(const struct collection *c) {
249 struct recheck_state cs;
250
d1694464 251 if(c)
252 info("rechecking %s", c->root);
253 else
254 info("rechecking all tracks");
460b9539 255 for(;;) {
256 checkabort();
257 global_tid = trackdb_begin_transaction();
258 memset(&cs, 0, sizeof cs);
259 cs.c = c;
d1694464 260 if(trackdb_scan(c ? c->root : 0, recheck_callback, &cs, global_tid))
261 goto fail;
460b9539 262 break;
263 fail:
264 /* Maybe we need to shut down */
265 checkabort();
266 /* Abort the transaction and try again in a bit. */
267 trackdb_abort_transaction(global_tid);
268 global_tid = 0;
269 /* Let anything else that is going on get out of the way. */
270 sleep(10);
271 checkabort();
d1694464 272 if(c)
273 info("resuming recheck of %s", c->root);
274 else
275 info("resuming global recheck");
460b9539 276 }
277 trackdb_commit_transaction(global_tid);
278 global_tid = 0;
d1694464 279 if(c)
280 info("rechecked %s, %ld obsoleted, %ld lengths calculated",
281 c->root, cs.nobsolete, cs.nlength);
282 else
283 info("rechecked all tracks, %ld no collection, %ld obsoleted, %ld lengths calculated",
284 cs.nnocollection, cs.nobsolete, cs.nlength);
460b9539 285}
286
287/* rescan/recheck a collection by name */
288static void do_directory(const char *s,
289 void (*fn)(const struct collection *c)) {
290 int n;
291
292 for(n = 0; (n < config->collection.n
293 && strcmp(config->collection.s[n].root, s)); ++n)
294 ;
295 if(n < config->collection.n)
296 fn(&config->collection.s[n]);
297 else
298 error(0, "no collection has root '%s'", s);
299}
300
301/* rescan/recheck all collections */
302static void do_all(void (*fn)(const struct collection *c)) {
303 int n;
304
305 for(n = 0; n < config->collection.n; ++n)
306 fn(&config->collection.s[n]);
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RK
307 /* TODO: we need to tidy up tracks from collections now removed. We could do
308 * this two ways: either remember collections we think there are and spot
309 * their disappearance, or iterate over all tracks and gc any that don't fit
310 * into some collection.
311 *
312 * Having a way to rename collections would be rather convenient too but
313 * that's another kettle of monkeys.
314 */
460b9539 315}
316
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RK
317/** @brief Expire noticed.db */
318static void expire_noticed(void) {
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RK
319 time_t now;
320
321 time(&now);
322 trackdb_expire_noticed(now - config->noticed_history * 86400);
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RK
323}
324
460b9539 325int main(int argc, char **argv) {
0ca6d097 326 int n, logsyslog = !isatty(2);
460b9539 327 struct sigaction sa;
328
329 set_progname(argv);
320598d4 330 mem_init();
460b9539 331 if(!setlocale(LC_CTYPE, "")) fatal(errno, "error calling setlocale");
0ca6d097 332 while((n = getopt_long(argc, argv, "hVc:dDSs", options, 0)) >= 0) {
460b9539 333 switch(n) {
334 case 'h': help();
335 case 'V': version();
336 case 'c': configfile = optarg; break;
337 case 'd': debugging = 1; break;
338 case 'D': debugging = 0; break;
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RK
339 case 'S': logsyslog = 0; break;
340 case 's': logsyslog = 1; break;
460b9539 341 default: fatal(0, "invalid option");
342 }
343 }
5464a25a 344 if(logsyslog) {
460b9539 345 openlog(progname, LOG_PID, LOG_DAEMON);
346 log_default = &log_syslog;
347 }
c00fce3a 348 if(config_read(0)) fatal(0, "cannot read configuration");
460b9539 349 xnice(config->nice_rescan);
350 sa.sa_handler = signal_handler;
351 sa.sa_flags = SA_RESTART;
352 sigemptyset(&sa.sa_mask);
353 xsigaction(SIGTERM, &sa, 0);
354 xsigaction(SIGINT, &sa, 0);
355 info("started");
356 trackdb_init(0);
357 trackdb_open();
358 if(optind == argc) {
d1694464 359 /* Rescan all collections */
460b9539 360 do_all(rescan_collection);
d1694464 361 /* Check that every track still exists */
362 recheck_collection(0);
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RK
363 /* Expire noticed.db */
364 expire_noticed();
460b9539 365 }
366 else {
d1694464 367 /* Rescan specified collections */
460b9539 368 for(n = optind; n < argc; ++n)
369 do_directory(argv[n], rescan_collection);
d1694464 370 /* Check specified collections for tracks that have gone */
460b9539 371 for(n = optind; n < argc; ++n)
372 do_directory(argv[n], recheck_collection);
373 }
374 trackdb_close();
375 trackdb_deinit();
376 info("completed");
377 return 0;
378}
379
380/*
381Local Variables:
382c-basic-offset:2
383comment-column:40
384fill-column:79
385indent-tabs-mode:nil
386End:
387*/