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

   1 /*
   2  * This file is part of DisOrder
   3  * Copyright (C) 2008-2010 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 3 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,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU 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, see <http://www.gnu.org/licenses/>.
  17  */
  18 /** @file server/disorder-server.h
  19  * @brief Definitions for server and allied utilities
  20  */
  21
  22 #ifndef DISORDER_SERVER_H
  23 #define DISORDER_SERVER_H
  24
  25 #include "common.h"
  26
  27 #include <db.h>
  28 #include <errno.h>
  29 #include <fcntl.h>
  30 #include <fnmatch.h>
  31 #include <gcrypt.h>
  32 #include <getopt.h>
  33 #include <grp.h>
  34 #include <locale.h>
  35 #include <netinet/in.h>
  36 #include <pcre.h>
  37 #include <pwd.h>
  38 #include <signal.h>
  39 #include <stddef.h>
  40 #include <sys/socket.h>
  41 #include <sys/stat.h>
  42 #include <sys/time.h>
  43 #include <sys/types.h>
  44 #include <sys/un.h>
  45 #include <sys/resource.h>
  46 #include <syslog.h>
  47 #include <time.h>
  48 #include <unistd.h>
  49
  50 #include "addr.h"
  51 #include "authhash.h"
  52 #include "base64.h"
  53 #include "cache.h"
  54 #include "charset.h"
  55 #include "configuration.h"
  56 #include "cookies.h"
  57 #include "defs.h"
  58 #include "disorder.h"
  59 #include "event.h"
  60 #include "eventlog.h"
  61 #include "eventlog.h"
  62 #include "hash.h"
  63 #include "hex.h"
  64 #include "inputline.h"
  65 #include "kvp.h"
  66 #include "log.h"
  67 #include "logfd.h"
  68 #include "mem.h"
  69 #include "mime.h"
  70 #include "printf.h"
  71 #include "queue.h"
  72 #include "random.h"
  73 #include "rights.h"
  74 #include "sendmail.h"
  75 #include "sink.h"
  76 #include "speaker-protocol.h"
  77 #include "split.h"
  78 #include "syscalls.h"
  79 #include "table.h"
  80 #include "trackdb-int.h"
  81 #include "trackdb.h"
  82 #include "trackname.h"
  83 #include "uaudio.h"
  84 #include "unicode.h"
  85 #include "user.h"
  86 #include "vector.h"
  87 #include "version.h"
  88 #include "wstat.h"
  89
  90 extern const struct uaudio *api;
  91
  92 void daemonize(const char *tag, int fac, const char *pidfile);
  93 /* Go into background.  Send stdout/stderr to syslog.
  94  * If @pri@ is non-null, it should be "facility.level"
  95  * If @tag@ is non-null, it is used as a tag to each message
  96  * If @pidfile@ is non-null, the PID is written to that file.
  97  */
  98
  99 void quit(ev_source *ev) attribute((noreturn));
 100 /* terminate the daemon */
 101
 102 int reconfigure(ev_source *ev, unsigned flags);
 103 /* reconfigure */
 104
 105 void reset_sockets(ev_source *ev);
 106
 107 /** @brief Set when starting server */
 108 #define RECONFIGURE_FIRST 0x0001
 109
 110 /** @brief Set when reloading after SIGHUP etc */
 111 #define RECONFIGURE_RELOADING 0x0002
 112
 113 void dbparams_check(void);
 114
 115 extern struct queue_entry qhead;
 116 /* queue of things yet to be played.  the head will be played
 117  * soonest. */
 118
 119 extern struct queue_entry phead;
 120 /* things that have been played in the past.  the head is the oldest. */
 121
 122 extern long pcount;
 123
 124 void queue_read(void);
 125 /* read the queue in.  Calls @fatal@ on error. */
 126
 127 void queue_write(void);
 128 /* write the queue out.  Calls @fatal@ on error. */
 129
 130 void recent_read(void);
 131 /* read the recently played list in.  Calls @fatal@ on error. */
 132
 133 void recent_write(void);
 134 /* write the recently played list out.  Calls @fatal@ on error. */
 135
 136 struct queue_entry *queue_add(const char *track, const char *submitter,
 137                               int where, const char *target,
 138                               enum track_origin origin);
 139 #define WHERE_START 0                   /* Add to head of queue */
 140 #define WHERE_END 1                     /* Add to end of queue */
 141 #define WHERE_BEFORE_RANDOM 2           /* End, or before random track */
 142 #define WHERE_AFTER 3                   /* After the target */
 143 #define WHERE_NOWHERE 4                 /* Don't add to queue at all */
 144 /* add an entry to the queue.  Return a pointer to the new entry. */
 145
 146 void queue_remove(struct queue_entry *q, const char *who);
 147 /* remove an from the queue */
 148
 149 struct queue_entry *queue_find(const char *key);
 150 /* find a track in the queue by name or ID */
 151
 152 void queue_played(struct queue_entry *q);
 153 /* add @q@ to the played list */
 154
 155 int queue_move(struct queue_entry *q, int delta, const char *who);
 156 /* move element @q@ in the queue towards the front (@delta@ > 0) or towards the
 157  * back (@delta@ < 0).  The return value is the leftover delta once we've hit
 158  * the end in whichever direction we were going. */
 159
 160 void queue_moveafter(struct queue_entry *target,
 161                      int nqs, struct queue_entry **qs, const char *who);
 162 /* Move all the elements QS to just after TARGET, or to the head if
 163  * TARGET=0. */
 164
 165 void queue_fix_sofar(struct queue_entry *q);
 166 /* Fix up the sofar field for standalone players */
 167
 168 void schedule_init(ev_source *ev);
 169 const char *schedule_add(ev_source *ev,
 170                          struct kvp *actiondata);
 171 int schedule_del(const char *id);
 172 struct kvp *schedule_get(const char *id);
 173 char **schedule_list(int *neventsp);
 174
 175 extern struct queue_entry *playing;     /* playing track or 0 */
 176 extern int paused;                      /* non-0 if paused */
 177
 178 void play(ev_source *ev);
 179 /* try to play something, if playing is enabled and nothing is playing
 180  * already */
 181
 182 int playing_is_enabled(void);
 183 /* return true iff playing is enabled */
 184
 185 void enable_playing(const char *who, ev_source *ev);
 186 /* enable playing */
 187
 188 void disable_playing(const char *who);
 189 /* disable playing. */
 190
 191 int random_is_enabled(void);
 192 /* return true iff random play is enabled */
 193
 194 void enable_random(const char *who, ev_source *ev);
 195 /* enable random play */
 196
 197 void disable_random(const char *who);
 198 /* disable random play */
 199
 200 void scratch(const char *who, const char *id);
 201 /* scratch the playing track.  @who@ identifies the scratcher. @id@ is
 202  * the ID or a null pointer. */
 203
 204 void quitting(ev_source *ev);
 205 /* called to terminate current track and shut down speaker process
 206  * when quitting */
 207
 208 void speaker_setup(ev_source *ev);
 209 /* set up the speaker subprocess */
 210
 211 void speaker_reload(void);
 212 /* Tell the speaker process to reload its configuration. */
 213
 214 int pause_playing(const char *who);
 215 /* Pause the current track.  Return 0 on success, -1 on error.  WHO
 216  * can be 0. */
 217
 218 void resume_playing(const char *who);
 219 /* Resume after a pause.  WHO can be 0. */
 220
 221 int prepare(ev_source *ev,
 222             struct queue_entry *q);
 223 /* Prepare to play Q */
 224
 225 void abandon(ev_source *ev,
 226              struct queue_entry *q);
 227 /* Abandon a possibly-prepared track. */
 228
 229 void add_random_track(ev_source *ev);
 230 /* If random play is enabled then try to add a track to the queue. */
 231
 232 int server_start(ev_source *ev, int pf,
 233                  size_t socklen, const struct sockaddr *sa,
 234                  const char *name);
 235 /* start listening.  Return the fd. */
 236
 237 int server_stop(ev_source *ev, int fd);
 238 /* Stop listening on @fd@ */
 239
 240 extern int volume_left, volume_right;   /* last known volume */
 241
 242 extern int wideopen;                    /* blindly accept all logins */
 243
 244 /* plugins */
 245
 246 struct plugin;
 247
 248 typedef void *plugin_handle;
 249 typedef void function_t(void);
 250
 251 const struct plugin *open_plugin(const char *name,
 252                                  unsigned flags);
 253 #define PLUGIN_FATAL 0x0001             /* fatal() on error */
 254 /* Open a plugin.  Returns a null pointer on error or a handle to it
 255  * on success. */
 256
 257 function_t *get_plugin_function(const struct plugin *handle,
 258                                 const char *symbol);
 259 const void *get_plugin_object(const struct plugin *handle,
 260                               const char *symbol);
 261 /* Look up a function or an object in a plugin */
 262
 263 /* track length computation ***************************************************/
 264
 265 long tracklength(const char *plugin, const char *track, const char *path);
 266
 267 /* collection interface *******************************************************/
 268
 269 void scan(const char *module, const char *root);
 270 /* write a list of path names below @root@ to standard output. */
 271
 272 int check(const char *module, const char *root, const char *path);
 273 /* Recheck a track, given its root and path name.  Return 1 if it
 274  * exists, 0 if it does not exist and -1 if an error occurred. */
 275
 276 /* notification interface *****************************************************/
 277
 278 void notify_play(const char *track,
 279                  const char *submitter);
 280 /* we're going to play @track@.  It was submitted by @submitter@
 281  * (might be a null pointer) */
 282
 283 void notify_scratch(const char *track,
 284                     const char *submitter,
 285                     const char *scratcher,
 286                     int seconds);
 287 /* @scratcher@ scratched @track@ after @seconds@.  It was submitted by
 288  * @submitter@ (might be a null pointer) */
 289
 290 void notify_not_scratched(const char *track,
 291                           const char *submitter);
 292 /* @track@ (submitted by @submitter@, which might be a null pointer)
 293  * was not scratched. */
 294
 295 void notify_queue(const char *track,
 296                   const char *submitter);
 297 /* @track@ was queued by @submitter@ */
 298
 299 void notify_queue_remove(const char *track,
 300                          const char *remover);
 301 /* @track@ removed from the queue by @remover@ (never a null pointer) */
 302
 303 void notify_queue_move(const char *track,
 304                        const char *mover);
 305 /* @track@ moved in the queue by @mover@ (never a null pointer) */
 306
 307 void notify_pause(const char *track,
 308                   const char *pauser);
 309 /* TRACK was paused by PAUSER (might be a null pointer) */
 310
 311 void notify_resume(const char *track,
 312                    const char *resumer);
 313 /* TRACK was resumed by PAUSER (might be a null pointer) */
 314
 315 /* track playing **************************************************************/
 316
 317 unsigned long play_get_type(const struct plugin *pl);
 318 /* Get the type word for this plugin */
 319
 320 void *play_prefork(const struct plugin *pl,
 321                    const char *track);
 322 /* Call the prefork function for PL and return the user data */
 323
 324 void play_track(const struct plugin *pl,
 325                 const char *const *parameters,
 326                 int nparameters,
 327                 const char *path,
 328                 const char *track);
 329 /* play a track.  Called inside a fork. */
 330
 331 void play_cleanup(const struct plugin *pl, void *data);
 332 /* Call the cleanup function for PL if necessary */
 333
 334 int play_pause(const struct plugin *pl, long *playedp, void *data);
 335 /* Pause track. */
 336
 337 void play_resume(const struct plugin *pl, void *data);
 338 /* Resume track. */
 339
 340 /* background process support *************************************************/
 341
 342 /** @brief Child process parameters */
 343 struct pbgc_params {
 344   /** @brief Length of player command */
 345   int argc;
 346   /** @brief Player command */
 347   const char **argv;
 348   /** @brief Device to wait for or NULL */
 349   const char *waitdevice;
 350   /** @brief Raw track name */
 351   const char *rawpath;
 352 };
 353
 354 /** @brief Callback to play or prepare a track
 355  * @param q Track to play or decode
 356  * @param bgdata User data pointer
 357  * @return Exit code
 358  */
 359 typedef int play_background_child_fn(struct queue_entry *q,
 360                                      const struct pbgc_params *params,
 361                                      void *bgdata);
 362
 363 int play_background(ev_source *ev,
 364                     const struct stringlist *player,
 365                     struct queue_entry *q,
 366                     play_background_child_fn *child,
 367                     void *bgdata);
 368
 369 /* Return values from start(),  prepare() and play_background() */
 370
 371 #define START_OK 0         /**< @brief Succeeded. */
 372 #define START_HARDFAIL 1   /**< @brief Track is broken. */
 373 #define START_SOFTFAIL 2   /**< @brief Track OK, system (temporarily?) broken */
 374
 375 void periodic_mount_check(ev_source *ev_);
 376
 377 #ifndef MOUNT_CHECK_INTERVAL
 378 # ifdef PATH_MTAB
 379 // statting a file is really cheap so check once a second
 380 #  define MOUNT_CHECK_INTERVAL 1
 381 # else
 382 // hashing getfsstat() output could be more expensive so be less aggressive
 383 #  define MOUNT_CHECK_INTERVAL 5
 384 # endif
 385 #endif
 386
 387 #endif /* DISORDER_SERVER_H */
 388
 389 /*
 390 Local Variables:
 391 c-basic-offset:2
 392 comment-column:40
 393 fill-column:79
 394 indent-tabs-mode:nil
 395 End:
 396 */