Commit | Line | Data |
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460b9539 | 1 | /* |
2 | * This file is part of DisOrder | |
3 | * Copyright (C) 2005, 2006 Richard Kettlewell | |
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> | |
37 | ||
38 | #include "configuration.h" | |
39 | #include "syscalls.h" | |
40 | #include "log.h" | |
41 | #include "defs.h" | |
42 | #include "mem.h" | |
43 | #include "plugin.h" | |
44 | #include "inputline.h" | |
45 | #include "charset.h" | |
46 | #include "wstat.h" | |
47 | #include "kvp.h" | |
48 | #include "printf.h" | |
49 | #include "trackdb.h" | |
50 | #include "trackdb-int.h" | |
51 | ||
52 | static DB_TXN *global_tid; | |
53 | ||
54 | static const struct option options[] = { | |
55 | { "help", no_argument, 0, 'h' }, | |
56 | { "version", no_argument, 0, 'V' }, | |
57 | { "config", required_argument, 0, 'c' }, | |
58 | { "debug", no_argument, 0, 'd' }, | |
59 | { "no-debug", no_argument, 0, 'D' }, | |
60 | { 0, 0, 0, 0 } | |
61 | }; | |
62 | ||
63 | /* display usage message and terminate */ | |
64 | static void help(void) { | |
65 | xprintf("Usage:\n" | |
66 | " disorder-rescan [OPTIONS] [PATH...]\n" | |
67 | "Options:\n" | |
68 | " --help, -h Display usage message\n" | |
69 | " --version, -V Display version number\n" | |
70 | " --config PATH, -c PATH Set configuration file\n" | |
71 | " --debug, -d Turn on debugging\n" | |
72 | "\n" | |
73 | "Rescanner for DisOrder. Not intended to be run\n" | |
74 | "directly.\n"); | |
75 | xfclose(stdout); | |
76 | exit(0); | |
77 | } | |
78 | ||
79 | /* display version number and terminate */ | |
80 | static void version(void) { | |
81 | xprintf("disorder-rescan version %s\n", disorder_version_string); | |
82 | xfclose(stdout); | |
83 | exit(0); | |
84 | } | |
85 | ||
86 | static volatile sig_atomic_t signalled; | |
87 | ||
88 | static void signal_handler(int sig) { | |
89 | if(sig == 0) _exit(-1); /* "Cannot happen" */ | |
90 | signalled = sig; | |
91 | } | |
92 | ||
93 | static int aborted(void) { | |
94 | return signalled || getppid() == 1; | |
95 | } | |
96 | ||
97 | /* Exit if our parent has gone away or we have been told to stop. */ | |
98 | static void checkabort(void) { | |
99 | if(getppid() == 1) { | |
100 | info("parent has terminated"); | |
101 | trackdb_abort_transaction(global_tid); | |
102 | exit(0); | |
103 | } | |
104 | if(signalled) { | |
105 | info("received signal %d", signalled); | |
106 | trackdb_abort_transaction(global_tid); | |
107 | exit(0); | |
108 | } | |
109 | } | |
110 | ||
111 | /* rescan a collection */ | |
112 | static void rescan_collection(const struct collection *c) { | |
113 | pid_t pid, r; | |
114 | int p[2], n, w; | |
115 | FILE *fp = 0; | |
116 | char *path, *track; | |
117 | long ntracks = 0, nnew = 0; | |
118 | ||
119 | checkabort(); | |
120 | info("rescanning %s with %s", c->root, c->module); | |
121 | /* plugin runs in a subprocess */ | |
122 | xpipe(p); | |
123 | if(!(pid = xfork())) { | |
124 | exitfn = _exit; | |
125 | xclose(p[0]); | |
126 | xdup2(p[1], 1); | |
127 | xclose(p[1]); | |
128 | scan(c->module, c->root); | |
129 | if(fflush(stdout) < 0) | |
130 | fatal(errno, "error writing to scanner pipe"); | |
131 | _exit(0); | |
132 | } | |
133 | xclose(p[1]); | |
134 | if(!(fp = fdopen(p[0], "r"))) | |
135 | fatal(errno, "error calling fdopen"); | |
136 | /* read tracks from the plugin */ | |
137 | while(!inputline("rescanner", fp, &path, 0)) { | |
138 | checkabort(); | |
139 | /* actually we can cope relatively well within the server, but they'll go | |
140 | * wrong in track listings */ | |
141 | if(strchr(path, '\n')) { | |
142 | error(0, "cannot cope with tracks with newlines in the name"); | |
143 | continue; | |
144 | } | |
145 | if(!(track = any2utf8(c->encoding, path))) { | |
146 | error(0, "cannot convert track path to UTF-8: %s", path); | |
147 | continue; | |
148 | } | |
149 | D(("track %s", track)); | |
150 | /* only tracks with a known player are admitted */ | |
151 | for(n = 0; (n < config->player.n | |
152 | && fnmatch(config->player.s[n].s[0], track, 0) != 0); ++n) | |
153 | ; | |
154 | if(n < config->player.n) { | |
155 | nnew += !!trackdb_notice(track, path); | |
156 | ++ntracks; | |
157 | } | |
158 | } | |
159 | /* tidy up */ | |
160 | if(ferror(fp)) { | |
161 | error(errno, "error reading from scanner pipe"); | |
162 | goto done; | |
163 | } | |
164 | xfclose(fp); | |
165 | fp = 0; | |
166 | while((r = waitpid(pid, &w, 0)) == -1 && errno == EINTR) | |
167 | ; | |
168 | if(r < 0) fatal(errno, "error calling waitpid"); | |
169 | pid = 0; | |
170 | if(w) { | |
171 | error(0, "scanner subprocess: %s", wstat(w)); | |
172 | goto done; | |
173 | } | |
174 | info("rescanned %s, %ld tracks, %ld new", c->root, ntracks, nnew); | |
175 | done: | |
176 | if(fp) | |
177 | xfclose(fp); | |
178 | if(pid) | |
179 | while((r = waitpid(pid, &w, 0)) == -1 && errno == EINTR) | |
180 | ; | |
181 | } | |
182 | ||
183 | struct recheck_state { | |
184 | const struct collection *c; | |
185 | long nobsolete, nlength; | |
186 | }; | |
187 | ||
188 | /* called for each non-alias track */ | |
189 | static int recheck_callback(const char *track, | |
190 | struct kvp *data, | |
191 | void *u, | |
192 | DB_TXN *tid) { | |
193 | struct recheck_state *cs = u; | |
194 | const struct collection *c = cs->c; | |
195 | const char *path = kvp_get(data, "_path"); | |
196 | char buffer[20]; | |
197 | int err; | |
198 | long n; | |
199 | ||
200 | if(aborted()) return EINTR; | |
201 | D(("rechecking %s", track)); | |
202 | /* see if the track has evaporated */ | |
203 | if(check(c->module, c->root, path) == 0) { | |
204 | D(("obsoleting %s", track)); | |
205 | if((err = trackdb_obsolete(track, tid))) return err; | |
206 | ++cs->nobsolete; | |
207 | return 0; | |
208 | } | |
209 | /* make sure we know the length */ | |
210 | if(!kvp_get(data, "_length")) { | |
211 | D(("recalculating length of %s", track)); | |
212 | n = tracklength(track, path); | |
213 | if(n > 0) { | |
214 | byte_snprintf(buffer, sizeof buffer, "%ld", n); | |
215 | kvp_set(&data, "_length", buffer); | |
216 | if((err = trackdb_putdata(trackdb_tracksdb, track, data, tid, 0))) | |
217 | return err; | |
218 | ++cs->nlength; | |
219 | } | |
220 | } | |
221 | return 0; | |
222 | } | |
223 | ||
224 | /* recheck a collection */ | |
225 | static void recheck_collection(const struct collection *c) { | |
226 | struct recheck_state cs; | |
227 | ||
228 | info("rechecking %s", c->root); | |
229 | for(;;) { | |
230 | checkabort(); | |
231 | global_tid = trackdb_begin_transaction(); | |
232 | memset(&cs, 0, sizeof cs); | |
233 | cs.c = c; | |
234 | if(trackdb_scan(c->root, recheck_callback, &cs, global_tid)) goto fail; | |
235 | break; | |
236 | fail: | |
237 | /* Maybe we need to shut down */ | |
238 | checkabort(); | |
239 | /* Abort the transaction and try again in a bit. */ | |
240 | trackdb_abort_transaction(global_tid); | |
241 | global_tid = 0; | |
242 | /* Let anything else that is going on get out of the way. */ | |
243 | sleep(10); | |
244 | checkabort(); | |
245 | info("resuming recheck of %s", c->root); | |
246 | } | |
247 | trackdb_commit_transaction(global_tid); | |
248 | global_tid = 0; | |
249 | info("rechecked %s, %ld obsoleted, %ld lengths calculated", | |
250 | c->root, cs.nobsolete, cs.nlength); | |
251 | } | |
252 | ||
253 | /* rescan/recheck a collection by name */ | |
254 | static void do_directory(const char *s, | |
255 | void (*fn)(const struct collection *c)) { | |
256 | int n; | |
257 | ||
258 | for(n = 0; (n < config->collection.n | |
259 | && strcmp(config->collection.s[n].root, s)); ++n) | |
260 | ; | |
261 | if(n < config->collection.n) | |
262 | fn(&config->collection.s[n]); | |
263 | else | |
264 | error(0, "no collection has root '%s'", s); | |
265 | } | |
266 | ||
267 | /* rescan/recheck all collections */ | |
268 | static void do_all(void (*fn)(const struct collection *c)) { | |
269 | int n; | |
270 | ||
271 | for(n = 0; n < config->collection.n; ++n) | |
272 | fn(&config->collection.s[n]); | |
6aba3f6c RK |
273 | /* TODO: we need to tidy up tracks from collections now removed. We could do |
274 | * this two ways: either remember collections we think there are and spot | |
275 | * their disappearance, or iterate over all tracks and gc any that don't fit | |
276 | * into some collection. | |
277 | * | |
278 | * Having a way to rename collections would be rather convenient too but | |
279 | * that's another kettle of monkeys. | |
280 | */ | |
460b9539 | 281 | } |
282 | ||
283 | int main(int argc, char **argv) { | |
284 | int n; | |
285 | struct sigaction sa; | |
286 | ||
287 | set_progname(argv); | |
288 | mem_init(1); | |
289 | if(!setlocale(LC_CTYPE, "")) fatal(errno, "error calling setlocale"); | |
290 | while((n = getopt_long(argc, argv, "hVc:dD", options, 0)) >= 0) { | |
291 | switch(n) { | |
292 | case 'h': help(); | |
293 | case 'V': version(); | |
294 | case 'c': configfile = optarg; break; | |
295 | case 'd': debugging = 1; break; | |
296 | case 'D': debugging = 0; break; | |
297 | default: fatal(0, "invalid option"); | |
298 | } | |
299 | } | |
300 | /* If stderr is a TTY then log there, otherwise to syslog. */ | |
301 | if(!isatty(2)) { | |
302 | openlog(progname, LOG_PID, LOG_DAEMON); | |
303 | log_default = &log_syslog; | |
304 | } | |
305 | if(config_read()) fatal(0, "cannot read configuration"); | |
306 | xnice(config->nice_rescan); | |
307 | sa.sa_handler = signal_handler; | |
308 | sa.sa_flags = SA_RESTART; | |
309 | sigemptyset(&sa.sa_mask); | |
310 | xsigaction(SIGTERM, &sa, 0); | |
311 | xsigaction(SIGINT, &sa, 0); | |
312 | info("started"); | |
313 | trackdb_init(0); | |
314 | trackdb_open(); | |
315 | if(optind == argc) { | |
316 | do_all(rescan_collection); | |
317 | do_all(recheck_collection); | |
318 | } | |
319 | else { | |
320 | for(n = optind; n < argc; ++n) | |
321 | do_directory(argv[n], rescan_collection); | |
322 | for(n = optind; n < argc; ++n) | |
323 | do_directory(argv[n], recheck_collection); | |
324 | } | |
325 | trackdb_close(); | |
326 | trackdb_deinit(); | |
327 | info("completed"); | |
328 | return 0; | |
329 | } | |
330 | ||
331 | /* | |
332 | Local Variables: | |
333 | c-basic-offset:2 | |
334 | comment-column:40 | |
335 | fill-column:79 | |
336 | indent-tabs-mode:nil | |
337 | End: | |
338 | */ |