chiark / gitweb /
implement expiry of newly added tracks list
[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' },
62 { 0, 0, 0, 0 }
63};
64
65/* display usage message and terminate */
66static void help(void) {
67 xprintf("Usage:\n"
68 " disorder-rescan [OPTIONS] [PATH...]\n"
69 "Options:\n"
70 " --help, -h Display usage message\n"
71 " --version, -V Display version number\n"
72 " --config PATH, -c PATH Set configuration file\n"
73 " --debug, -d Turn on debugging\n"
74 "\n"
75 "Rescanner for DisOrder. Not intended to be run\n"
76 "directly.\n");
77 xfclose(stdout);
78 exit(0);
79}
80
81/* display version number and terminate */
82static void version(void) {
83 xprintf("disorder-rescan version %s\n", disorder_version_string);
84 xfclose(stdout);
85 exit(0);
86}
87
88static volatile sig_atomic_t signalled;
89
90static void signal_handler(int sig) {
91 if(sig == 0) _exit(-1); /* "Cannot happen" */
92 signalled = sig;
93}
94
95static int aborted(void) {
96 return signalled || getppid() == 1;
97}
98
99/* Exit if our parent has gone away or we have been told to stop. */
100static void checkabort(void) {
101 if(getppid() == 1) {
102 info("parent has terminated");
103 trackdb_abort_transaction(global_tid);
104 exit(0);
105 }
106 if(signalled) {
107 info("received signal %d", signalled);
108 trackdb_abort_transaction(global_tid);
109 exit(0);
110 }
111}
112
113/* rescan a collection */
114static void rescan_collection(const struct collection *c) {
115 pid_t pid, r;
116 int p[2], n, w;
117 FILE *fp = 0;
118 char *path, *track;
119 long ntracks = 0, nnew = 0;
120
121 checkabort();
122 info("rescanning %s with %s", c->root, c->module);
123 /* plugin runs in a subprocess */
124 xpipe(p);
125 if(!(pid = xfork())) {
126 exitfn = _exit;
127 xclose(p[0]);
128 xdup2(p[1], 1);
129 xclose(p[1]);
130 scan(c->module, c->root);
131 if(fflush(stdout) < 0)
132 fatal(errno, "error writing to scanner pipe");
133 _exit(0);
134 }
135 xclose(p[1]);
136 if(!(fp = fdopen(p[0], "r")))
137 fatal(errno, "error calling fdopen");
138 /* read tracks from the plugin */
139 while(!inputline("rescanner", fp, &path, 0)) {
140 checkabort();
141 /* actually we can cope relatively well within the server, but they'll go
142 * wrong in track listings */
143 if(strchr(path, '\n')) {
144 error(0, "cannot cope with tracks with newlines in the name");
145 continue;
146 }
147 if(!(track = any2utf8(c->encoding, path))) {
148 error(0, "cannot convert track path to UTF-8: %s", path);
149 continue;
150 }
151 D(("track %s", track));
152 /* only tracks with a known player are admitted */
153 for(n = 0; (n < config->player.n
154 && fnmatch(config->player.s[n].s[0], track, 0) != 0); ++n)
155 ;
156 if(n < config->player.n) {
157 nnew += !!trackdb_notice(track, path);
158 ++ntracks;
e4ba53fd
RK
159 if(ntracks % 1000 == 0)
160 info("rescanning %s, %ld tracks so far", c->root, ntracks);
460b9539 161 }
162 }
163 /* tidy up */
164 if(ferror(fp)) {
165 error(errno, "error reading from scanner pipe");
166 goto done;
167 }
168 xfclose(fp);
169 fp = 0;
170 while((r = waitpid(pid, &w, 0)) == -1 && errno == EINTR)
171 ;
172 if(r < 0) fatal(errno, "error calling waitpid");
173 pid = 0;
174 if(w) {
175 error(0, "scanner subprocess: %s", wstat(w));
176 goto done;
177 }
178 info("rescanned %s, %ld tracks, %ld new", c->root, ntracks, nnew);
179done:
180 if(fp)
181 xfclose(fp);
182 if(pid)
183 while((r = waitpid(pid, &w, 0)) == -1 && errno == EINTR)
184 ;
185}
186
187struct recheck_state {
188 const struct collection *c;
d1694464 189 long nobsolete, nnocollection, nlength;
460b9539 190};
191
192/* called for each non-alias track */
193static int recheck_callback(const char *track,
194 struct kvp *data,
195 void *u,
196 DB_TXN *tid) {
197 struct recheck_state *cs = u;
198 const struct collection *c = cs->c;
199 const char *path = kvp_get(data, "_path");
200 char buffer[20];
201 int err;
202 long n;
203
204 if(aborted()) return EINTR;
205 D(("rechecking %s", track));
d1694464 206 /* if we're not checking a specific collection, find the right collection */
207 if(!c) {
208 if(!(c = find_track_collection(track))) {
209 D(("obsoleting %s", track));
210 if((err = trackdb_obsolete(track, tid))) return err;
211 ++cs->nnocollection;
212 return 0;
213 }
214 }
460b9539 215 /* see if the track has evaporated */
216 if(check(c->module, c->root, path) == 0) {
217 D(("obsoleting %s", track));
218 if((err = trackdb_obsolete(track, tid))) return err;
219 ++cs->nobsolete;
220 return 0;
221 }
222 /* make sure we know the length */
223 if(!kvp_get(data, "_length")) {
224 D(("recalculating length of %s", track));
225 n = tracklength(track, path);
226 if(n > 0) {
227 byte_snprintf(buffer, sizeof buffer, "%ld", n);
228 kvp_set(&data, "_length", buffer);
229 if((err = trackdb_putdata(trackdb_tracksdb, track, data, tid, 0)))
230 return err;
231 ++cs->nlength;
232 }
233 }
234 return 0;
235}
236
237/* recheck a collection */
238static void recheck_collection(const struct collection *c) {
239 struct recheck_state cs;
240
d1694464 241 if(c)
242 info("rechecking %s", c->root);
243 else
244 info("rechecking all tracks");
460b9539 245 for(;;) {
246 checkabort();
247 global_tid = trackdb_begin_transaction();
248 memset(&cs, 0, sizeof cs);
249 cs.c = c;
d1694464 250 if(trackdb_scan(c ? c->root : 0, recheck_callback, &cs, global_tid))
251 goto fail;
460b9539 252 break;
253 fail:
254 /* Maybe we need to shut down */
255 checkabort();
256 /* Abort the transaction and try again in a bit. */
257 trackdb_abort_transaction(global_tid);
258 global_tid = 0;
259 /* Let anything else that is going on get out of the way. */
260 sleep(10);
261 checkabort();
d1694464 262 if(c)
263 info("resuming recheck of %s", c->root);
264 else
265 info("resuming global recheck");
460b9539 266 }
267 trackdb_commit_transaction(global_tid);
268 global_tid = 0;
d1694464 269 if(c)
270 info("rechecked %s, %ld obsoleted, %ld lengths calculated",
271 c->root, cs.nobsolete, cs.nlength);
272 else
273 info("rechecked all tracks, %ld no collection, %ld obsoleted, %ld lengths calculated",
274 cs.nnocollection, cs.nobsolete, cs.nlength);
460b9539 275}
276
277/* rescan/recheck a collection by name */
278static void do_directory(const char *s,
279 void (*fn)(const struct collection *c)) {
280 int n;
281
282 for(n = 0; (n < config->collection.n
283 && strcmp(config->collection.s[n].root, s)); ++n)
284 ;
285 if(n < config->collection.n)
286 fn(&config->collection.s[n]);
287 else
288 error(0, "no collection has root '%s'", s);
289}
290
291/* rescan/recheck all collections */
292static void do_all(void (*fn)(const struct collection *c)) {
293 int n;
294
295 for(n = 0; n < config->collection.n; ++n)
296 fn(&config->collection.s[n]);
6aba3f6c
RK
297 /* TODO: we need to tidy up tracks from collections now removed. We could do
298 * this two ways: either remember collections we think there are and spot
299 * their disappearance, or iterate over all tracks and gc any that don't fit
300 * into some collection.
301 *
302 * Having a way to rename collections would be rather convenient too but
303 * that's another kettle of monkeys.
304 */
460b9539 305}
306
2a10b70b
RK
307/** @brief Expire noticed.db */
308static void expire_noticed(void) {
1e64e9fb
RK
309 time_t now;
310
311 time(&now);
312 trackdb_expire_noticed(now - config->noticed_history * 86400);
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RK
313}
314
460b9539 315int main(int argc, char **argv) {
316 int n;
317 struct sigaction sa;
318
319 set_progname(argv);
320598d4 320 mem_init();
460b9539 321 if(!setlocale(LC_CTYPE, "")) fatal(errno, "error calling setlocale");
322 while((n = getopt_long(argc, argv, "hVc:dD", options, 0)) >= 0) {
323 switch(n) {
324 case 'h': help();
325 case 'V': version();
326 case 'c': configfile = optarg; break;
327 case 'd': debugging = 1; break;
328 case 'D': debugging = 0; break;
329 default: fatal(0, "invalid option");
330 }
331 }
332 /* If stderr is a TTY then log there, otherwise to syslog. */
333 if(!isatty(2)) {
334 openlog(progname, LOG_PID, LOG_DAEMON);
335 log_default = &log_syslog;
336 }
c00fce3a 337 if(config_read(0)) fatal(0, "cannot read configuration");
460b9539 338 xnice(config->nice_rescan);
339 sa.sa_handler = signal_handler;
340 sa.sa_flags = SA_RESTART;
341 sigemptyset(&sa.sa_mask);
342 xsigaction(SIGTERM, &sa, 0);
343 xsigaction(SIGINT, &sa, 0);
344 info("started");
345 trackdb_init(0);
346 trackdb_open();
347 if(optind == argc) {
d1694464 348 /* Rescan all collections */
460b9539 349 do_all(rescan_collection);
d1694464 350 /* Check that every track still exists */
351 recheck_collection(0);
2a10b70b
RK
352 /* Expire noticed.db */
353 expire_noticed();
460b9539 354 }
355 else {
d1694464 356 /* Rescan specified collections */
460b9539 357 for(n = optind; n < argc; ++n)
358 do_directory(argv[n], rescan_collection);
d1694464 359 /* Check specified collections for tracks that have gone */
460b9539 360 for(n = optind; n < argc; ++n)
361 do_directory(argv[n], recheck_collection);
362 }
363 trackdb_close();
364 trackdb_deinit();
365 info("completed");
366 return 0;
367}
368
369/*
370Local Variables:
371c-basic-offset:2
372comment-column:40
373fill-column:79
374indent-tabs-mode:nil
375End:
376*/