mdw@git.distorted.org.uk Git - disorder/blob - server/rescan.c

   1 /*
   2  * This file is part of DisOrder
   3  * Copyright (C) 2005, 2006, 2007 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 #include <time.h>
  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"
  52 #include "trackname.h"
  53 #include "unicode.h"
  54
  55 static DB_TXN *global_tid;
  56
  57 static const struct option options[] = {
  58   { "help", no_argument, 0, 'h' },
  59   { "version", no_argument, 0, 'V' },
  60   { "config", required_argument, 0, 'c' },
  61   { "debug", no_argument, 0, 'd' },
  62   { "no-debug", no_argument, 0, 'D' },
  63   { "syslog", no_argument, 0, 's' },
  64   { "no-syslog", no_argument, 0, 'S' },
  65   { 0, 0, 0, 0 }
  66 };
  67
  68 /* display usage message and terminate */
  69 static void help(void) {
  70   xprintf("Usage:\n"
  71           "  disorder-rescan [OPTIONS] [PATH...]\n"
  72           "Options:\n"
  73           "  --help, -h              Display usage message\n"
  74           "  --version, -V           Display version number\n"
  75           "  --config PATH, -c PATH  Set configuration file\n"
  76           "  --debug, -d             Turn on debugging\n"
  77           "  --[no-]syslog           Force logging\n"
  78           "\n"
  79           "Rescanner for DisOrder.  Not intended to be run\n"
  80           "directly.\n");
  81   xfclose(stdout);
  82   exit(0);
  83 }
  84
  85 /* display version number and terminate */
  86 static void version(void) {
  87   xprintf("disorder-rescan version %s\n", disorder_version_string);
  88   xfclose(stdout);
  89   exit(0);
  90 }
  91
  92 static volatile sig_atomic_t signalled;
  93
  94 static void signal_handler(int sig) {
  95   if(sig == 0) _exit(-1);               /* "Cannot happen" */
  96   signalled = sig;
  97 }
  98
  99 static int aborted(void) {
 100   return signalled || getppid() == 1;
 101 }
 102
 103 /* Exit if our parent has gone away or we have been told to stop. */
 104 static void checkabort(void) {
 105   if(getppid() == 1) {
 106     info("parent has terminated");
 107     trackdb_abort_transaction(global_tid);
 108     exit(0);
 109   }
 110   if(signalled) {
 111     info("received signal %d", signalled);
 112     trackdb_abort_transaction(global_tid);
 113     exit(0);
 114   }
 115 }
 116
 117 /* rescan a collection */
 118 static void rescan_collection(const struct collection *c) {
 119   pid_t pid, r;
 120   int p[2], n, w;
 121   FILE *fp = 0;
 122   char *path, *track;
 123   long ntracks = 0, nnew = 0;
 124
 125   checkabort();
 126   info("rescanning %s with %s", c->root, c->module);
 127   /* plugin runs in a subprocess */
 128   xpipe(p);
 129   if(!(pid = xfork())) {
 130     exitfn = _exit;
 131     xclose(p[0]);
 132     xdup2(p[1], 1);
 133     xclose(p[1]);
 134     scan(c->module, c->root);
 135     if(fflush(stdout) < 0)
 136       fatal(errno, "error writing to scanner pipe");
 137     _exit(0);
 138   }
 139   xclose(p[1]);
 140   if(!(fp = fdopen(p[0], "r")))
 141     fatal(errno, "error calling fdopen");
 142   /* read tracks from the plugin */
 143   while(!inputline("rescanner", fp, &path, 0)) {
 144     checkabort();
 145     /* actually we can cope relatively well within the server, but they'll go
 146      * wrong in track listings */
 147     if(strchr(path, '\n')) {
 148       error(0, "cannot cope with tracks with newlines in the name");
 149       continue;
 150     }
 151     if(!(track = any2utf8(c->encoding, path))) {
 152       error(0, "cannot convert track path to UTF-8: %s", path);
 153       continue;
 154     }
 155     /* We use NFC track names */
 156     if(!(track = utf8_compose_canon(track, strlen(track), 0))) {
 157       error(0, "cannot convert track path to NFC: %s", path);
 158       continue;
 159     }
 160     D(("track %s", track));
 161     /* only tracks with a known player are admitted */
 162     for(n = 0; (n < config->player.n
 163                 && fnmatch(config->player.s[n].s[0], track, 0) != 0); ++n)
 164       ;
 165     if(n < config->player.n) {
 166       nnew += !!trackdb_notice(track, path);
 167       ++ntracks;
 168       if(ntracks % 1000 == 0)
 169         info("rescanning %s, %ld tracks so far", c->root, ntracks);
 170     }
 171   }
 172   /* tidy up */
 173   if(ferror(fp)) {
 174     error(errno, "error reading from scanner pipe");
 175     goto done;
 176   }
 177   xfclose(fp);
 178   fp = 0;
 179   while((r = waitpid(pid, &w, 0)) == -1 && errno == EINTR)
 180     ;
 181   if(r < 0) fatal(errno, "error calling waitpid");
 182   pid = 0;
 183   if(w) {
 184     error(0, "scanner subprocess: %s", wstat(w));
 185     goto done;
 186   }
 187   info("rescanned %s, %ld tracks, %ld new", c->root, ntracks, nnew);
 188 done:
 189   if(fp)
 190     xfclose(fp);
 191   if(pid)
 192     while((r = waitpid(pid, &w, 0)) == -1 && errno == EINTR)
 193       ;
 194 }
 195
 196 struct recheck_state {
 197   const struct collection *c;
 198   long nobsolete, nnocollection, nlength;
 199 };
 200
 201 /* called for each non-alias track */
 202 static int recheck_callback(const char *track,
 203                             struct kvp *data,
 204                             void *u,
 205                             DB_TXN *tid) {
 206   struct recheck_state *cs = u;
 207   const struct collection *c = cs->c;
 208   const char *path = kvp_get(data, "_path");
 209   char buffer[20];
 210   int err, n;
 211   long length;
 212
 213   if(aborted()) return EINTR;
 214   D(("rechecking %s", track));
 215   /* if we're not checking a specific collection, find the right collection */
 216   if(!c) {
 217     if(!(c = find_track_collection(track))) {
 218       D(("obsoleting %s", track));
 219       if((err = trackdb_obsolete(track, tid))) return err;
 220       ++cs->nnocollection;
 221       return 0;
 222     }
 223   }
 224   /* see if the track has evaporated */
 225   if(check(c->module, c->root, path) == 0) {
 226     D(("obsoleting %s", track));
 227     if((err = trackdb_obsolete(track, tid))) return err;
 228     ++cs->nobsolete;
 229     return 0;
 230   }
 231   /* make sure we know the length */
 232   if(!kvp_get(data, "_length")) {
 233     D(("recalculating length of %s", track));
 234     for(n = 0; n < config->tracklength.n; ++n)
 235       if(fnmatch(config->tracklength.s[n].s[0], track, 0) == 0)
 236         break;
 237     if(n >= config->tracklength.n)
 238       error(0, "no tracklength plugin found for %s", track);
 239     else {
 240       length = tracklength(config->tracklength.s[n].s[1], track, path);
 241       if(length > 0) {
 242         byte_snprintf(buffer, sizeof buffer, "%ld", length);
 243         kvp_set(&data, "_length", buffer);
 244         if((err = trackdb_putdata(trackdb_tracksdb, track, data, tid, 0)))
 245           return err;
 246         ++cs->nlength;
 247       }
 248     }
 249   }
 250   return 0;
 251 }
 252
 253 /* recheck a collection */
 254 static void recheck_collection(const struct collection *c) {
 255   struct recheck_state cs;
 256
 257   if(c)
 258     info("rechecking %s", c->root);
 259   else
 260     info("rechecking all tracks");
 261   for(;;) {
 262     checkabort();
 263     global_tid = trackdb_begin_transaction();
 264     memset(&cs, 0, sizeof cs);
 265     cs.c = c;
 266     if(trackdb_scan(c ? c->root : 0, recheck_callback, &cs, global_tid))
 267       goto fail;
 268     break;
 269   fail:
 270     /* Maybe we need to shut down */
 271     checkabort();
 272     /* Abort the transaction and try again in a bit. */
 273     trackdb_abort_transaction(global_tid);
 274     global_tid = 0;
 275     /* Let anything else that is going on get out of the way. */
 276     sleep(10);
 277     checkabort();
 278     if(c)
 279       info("resuming recheck of %s", c->root);
 280     else
 281       info("resuming global recheck");
 282   }
 283   trackdb_commit_transaction(global_tid);
 284   global_tid = 0;
 285   if(c)
 286     info("rechecked %s, %ld obsoleted, %ld lengths calculated",
 287          c->root, cs.nobsolete, cs.nlength);
 288   else
 289     info("rechecked all tracks, %ld no collection, %ld obsoleted, %ld lengths calculated",
 290          cs.nnocollection, cs.nobsolete, cs.nlength);
 291 }
 292
 293 /* rescan/recheck a collection by name */
 294 static void do_directory(const char *s,
 295                          void (*fn)(const struct collection *c)) {
 296   int n;
 297
 298   for(n = 0; (n < config->collection.n
 299               && strcmp(config->collection.s[n].root, s)); ++n)
 300     ;
 301   if(n < config->collection.n)
 302     fn(&config->collection.s[n]);
 303   else
 304     error(0, "no collection has root '%s'", s);
 305 }
 306
 307 /* rescan/recheck all collections */
 308 static void do_all(void (*fn)(const struct collection *c)) {
 309   int n;
 310
 311   for(n = 0; n < config->collection.n; ++n)
 312     fn(&config->collection.s[n]);
 313   /* TODO: we need to tidy up tracks from collections now removed.  We could do
 314    * this two ways: either remember collections we think there are and spot
 315    * their disappearance, or iterate over all tracks and gc any that don't fit
 316    * into some collection.
 317    *
 318    * Having a way to rename collections would be rather convenient too but
 319    * that's another kettle of monkeys.
 320    */
 321 }
 322
 323 /** @brief Expire noticed.db */
 324 static void expire_noticed(void) {
 325   time_t now;
 326
 327   time(&now);
 328   trackdb_expire_noticed(now - config->noticed_history * 86400);
 329 }
 330
 331 int main(int argc, char **argv) {
 332   int n, logsyslog = !isatty(2);
 333   struct sigaction sa;
 334
 335   set_progname(argv);
 336   mem_init();
 337   if(!setlocale(LC_CTYPE, "")) fatal(errno, "error calling setlocale");
 338   while((n = getopt_long(argc, argv, "hVc:dDSs", options, 0)) >= 0) {
 339     switch(n) {
 340     case 'h': help();
 341     case 'V': version();
 342     case 'c': configfile = optarg; break;
 343     case 'd': debugging = 1; break;
 344     case 'D': debugging = 0; break;
 345     case 'S': logsyslog = 0; break;
 346     case 's': logsyslog = 1; break;
 347     default: fatal(0, "invalid option");
 348     }
 349   }
 350   if(logsyslog) {
 351     openlog(progname, LOG_PID, LOG_DAEMON);
 352     log_default = &log_syslog;
 353   }
 354   if(config_read(0)) fatal(0, "cannot read configuration");
 355   xnice(config->nice_rescan);
 356   sa.sa_handler = signal_handler;
 357   sa.sa_flags = SA_RESTART;
 358   sigemptyset(&sa.sa_mask);
 359   xsigaction(SIGTERM, &sa, 0);
 360   xsigaction(SIGINT, &sa, 0);
 361   info("started");
 362   trackdb_init(0);
 363   trackdb_open();
 364   if(optind == argc) {
 365     /* Rescan all collections */
 366     do_all(rescan_collection);
 367     /* Check that every track still exists */
 368     recheck_collection(0);
 369     /* Expire noticed.db */
 370     expire_noticed();
 371   }
 372   else {
 373     /* Rescan specified collections */
 374     for(n = optind; n < argc; ++n)
 375       do_directory(argv[n], rescan_collection);
 376     /* Check specified collections for tracks that have gone */
 377     for(n = optind; n < argc; ++n)
 378       do_directory(argv[n], recheck_collection);
 379   }
 380   trackdb_close();
 381   trackdb_deinit();
 382   info("completed");
 383   return 0;
 384 }
 385
 386 /*
 387 Local Variables:
 388 c-basic-offset:2
 389 comment-column:40
 390 fill-column:79
 391 indent-tabs-mode:nil
 392 End:
 393 */