chiark - git - mdw - disorder/blob - lib/eclient.h

   1 /*
   2  * This file is part of DisOrder.
   3  * Copyright (C) 2006-2008 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 lib/eclient.h
  19  * @brief Client code for event-driven programs
  20  */
  21
  22 #ifndef ECLIENT_H
  23 #define ECLIENT_H
  24
  25 #include "rights.h"
  26
  27 /* Asynchronous client interface */
  28
  29 /** @brief Handle type */
  30 typedef struct disorder_eclient disorder_eclient;
  31
  32 struct queue_entry;
  33
  34 /** @brief Set to read from the FD */
  35 #define DISORDER_POLL_READ 1u
  36
  37 /** @brief Set to write to the FD */
  38 #define DISORDER_POLL_WRITE 2u
  39
  40 /** @brief Callbacks for all clients
  41  *
  42  * These must all be valid.
  43  */
  44 typedef struct disorder_eclient_callbacks {
  45   /** @brief Called when a communication error occurs.
  46    * @param u from disorder_eclient_new()
  47    * @param msg error message
  48    *
  49    * This might be called at any time, and indicates a low-level error,
  50    * e.g. connection refused by the server.  It does not mean that any requests
  51    * made of the owning eclient will not be fulfilled at some point.
  52    */
  53   void (*comms_error)(void *u, const char *msg);
  54
  55   /** @brief Called when a command fails (including initial authorization).
  56    * @param u from disorder_eclient_new()
  57    * @param v from failed command, or NULL if during setup
  58    * @param msg error message
  59    *
  60    * This call is obsolete at least in its current form, in which it is used to
  61    * report most errors from most requests.  Ultimately requests-specific
  62    * errors will be reported in a request-specific way rather than via this
  63    * generic callback.
  64    */
  65   void (*protocol_error)(void *u, void *v, int code, const char *msg);
  66
  67   /** @brief Set poll/select flags
  68    * @param u from disorder_eclient_new()
  69    * @param c handle
  70    * @param fd file descriptor
  71    * @param mode bitmap (@ref DISORDER_POLL_READ and/or @ref DISORDER_POLL_WRITE)
  72    *
  73    * Before @p fd is closed you will always get a call with @p mode = 0.
  74    */
  75   void (*poll)(void *u, disorder_eclient *c, int fd, unsigned mode);
  76
  77   /** @brief Report current activity
  78    * @param u from disorder_eclient_new()
  79    * @param msg Current activity or NULL
  80    *
  81    * Called with @p msg = NULL when there's nothing going on.
  82    */
  83   void (*report)(void *u, const char *msg);
  84 } disorder_eclient_callbacks;
  85
  86 /** @brief Callbacks for log clients
  87  *
  88  * All of these are allowed to be a null pointers in which case you don't get
  89  * told about that log event.
  90  *
  91  * See disorder_protocol(5) for full documentation.
  92  */
  93 typedef struct disorder_eclient_log_callbacks {
  94   /** @brief Called on (re-)connection */
  95   void (*connected)(void *v);
  96
  97   /** @brief Called when @p track finished playing successfully */
  98   void (*completed)(void *v, const char *track);
  99
 100   /** @brief Called when @p track fails for some reason */
 101   void (*failed)(void *v, const char *track, const char *status);
 102
 103   /** @brief Called when @p user moves some track or tracks in the queue
 104    *
 105    * Fetch the queue again to find out what the new order is - the
 106    * rearrangement could in principle be arbitrarily complicated.
 107    */
 108   void (*moved)(void *v, const char *user);
 109
 110   /** @brief Called when @p track starts playing
 111    *
 112    * @p user might be 0.
 113    */
 114   void (*playing)(void *v, const char *track, const char *user/*maybe 0*/);
 115
 116   /** @brief Called when @p q is added to the queue
 117    *
 118    * Fetch the queue again to find out where the in the queue it was added.
 119    */
 120   void (*queue)(void *v, struct queue_entry *q);
 121
 122   /** @brief Called when @p q is added to the recent list */
 123   void (*recent_added)(void *v, struct queue_entry *q);
 124
 125   /** @brief Called when @p id is removed from the recent list */
 126   void (*recent_removed)(void *v, const char *id);
 127
 128   /** @brief Called when @p id is removed from the queue
 129    *
 130    * @p user might be 0.
 131    */
 132   void (*removed)(void *v, const char *id, const char *user/*maybe 0*/);
 133
 134   /** @brief Called when @p track is scratched */
 135   void (*scratched)(void *v, const char *track, const char *user);
 136
 137   /** @brief Called with the current state whenever it changes
 138    *
 139    * State bits are:
 140    * - @ref DISORDER_PLAYING_ENABLED
 141    * - @ref DISORDER_RANDOM_ENABLED
 142    * - @ref DISORDER_TRACK_PAUSED
 143    * - @ref DISORDER_PLAYING
 144    * - @ref DISORDER_CONNECTED
 145    */
 146   void (*state)(void *v, unsigned long state);
 147
 148   /** @brief Called when the volume changes */
 149   void (*volume)(void *v, int left, int right);
 150
 151   /** @brief Called when a rescan completes */
 152   void (*rescanned)(void *v);
 153
 154   /** @brief Called when a user is created (admins only) */
 155   void (*user_add)(void *v, const char *user);
 156
 157   /** @brief Called when a user is confirmed (admins only) */
 158   void (*user_confirm)(void *v, const char *user);
 159
 160   /** @brief Called when a user is deleted (admins only) */
 161   void (*user_delete)(void *v, const char *user);
 162
 163   /** @brief Called when a user is edited (admins only) */
 164   void (*user_edit)(void *v, const char *user, const char *property);
 165
 166   /** @brief Called when your rights change */
 167   void (*rights_changed)(void *v, rights_type new_rights);
 168
 169   /** @brief Called when a track is adopted */
 170   void (*adopted)(void *v, const char *id, const char *who);
 171
 172   /** @brief Called when a new playlist is created */
 173   void (*playlist_created)(void *v, const char *playlist, const char *sharing);
 174
 175   /** @brief Called when a playlist is modified */
 176   void (*playlist_modified)(void *v, const char *playlist, const char *sharing);
 177
 178   /** @brief Called when a new playlist is deleted */
 179   void (*playlist_deleted)(void *v, const char *playlist);
 180
 181   /** @brief Called when a global pref is changed or delete */
 182   void (*global_pref)(void *v, const char *pref, const char *value/*or NULL*/);
 183 } disorder_eclient_log_callbacks;
 184
 185 /* State bits */
 186
 187 /** @brief Play is enabled */
 188 #define DISORDER_PLAYING_ENABLED  0x00000001
 189
 190 /** @brief Random play is enabled */
 191 #define DISORDER_RANDOM_ENABLED   0x00000002
 192
 193 /** @brief Track is paused
 194  *
 195  * This is only meaningful if @ref DISORDER_PLAYING is set
 196  */
 197 #define DISORDER_TRACK_PAUSED     0x00000004
 198
 199 /** @brief Track is playing
 200  *
 201  * This can be set even if the current track is paused (in which case @ref
 202  * DISORDER_TRACK_PAUSED) will also be set.
 203  */
 204 #define DISORDER_PLAYING    0x00000008
 205
 206 /** @brief Connected to server
 207  *
 208  * By connected it is meant that commands have a reasonable chance of being
 209  * processed soon, not merely that a TCP connection exists - for instance if
 210  * the client is still authenticating then that does not count as connected.
 211  */
 212 #define DISORDER_CONNECTED        0x00000010
 213
 214 char *disorder_eclient_interpret_state(unsigned long statebits);
 215
 216 struct queue_entry;
 217 struct kvp;
 218 struct sink;
 219
 220 /* Completion callbacks.  These provide the result of operations to the caller.
 221  * Unlike in earlier releases, these are not allowed to be NULL. */
 222
 223 /** @brief Trivial completion callback
 224  * @param v User data
 225  * @param err Error string or NULL on succes
 226  */
 227 typedef void disorder_eclient_no_response(void *v,
 228                                           const char *err);
 229
 230 /** @brief String result completion callback
 231  * @param v User data
 232  * @param err Error string or NULL on succes
 233  * @param value Result or NULL
 234  *
 235  * @p error will be NULL on success.  In this case @p value will be the result
 236  * (which might be NULL for disorder_eclient_get(),
 237  * disorder_eclient_get_global(), disorder_eclient_userinfo() and
 238  * disorder_eclient_playlist_get_share()).
 239  *
 240  * @p error will be non-NULL on failure.  In this case @p value is always NULL.
 241  */
 242 typedef void disorder_eclient_string_response(void *v,
 243                                               const char *err,
 244                                               const char *value);
 245
 246 /** @brief String result completion callback
 247  * @param v User data
 248  * @param err Error string or NULL on succes
 249  * @param value Result or 0
 250  *
 251  * @p error will be NULL on success.  In this case @p value will be the result.
 252  *
 253  * @p error will be non-NULL on failure.  In this case @p value is always 0.
 254  */
 255 typedef void disorder_eclient_integer_response(void *v,
 256                                                const char *err,
 257                                                long value);
 258 /** @brief Volume completion callback
 259  * @param v User data
 260  * @param err Error string or NULL on success
 261  * @param l Left channel volume
 262  * @param r Right channel volume
 263  *
 264  * @p error will be NULL on success.  In this case @p l and @p r will be the
 265  * result.
 266  *
 267  * @p error will be non-NULL on failure.  In this case @p l and @p r are always
 268  * 0.
 269  */
 270 typedef void disorder_eclient_volume_response(void *v,
 271                                               const char *err,
 272                                               int l, int r);
 273
 274 /** @brief Queue request completion callback
 275  * @param v User data
 276  * @param err Error string or NULL on success
 277  * @param q Head of queue data list
 278  *
 279  * @p error will be NULL on success.  In this case @p q will be the (head of
 280  * the) result.
 281  *
 282  * @p error will be non-NULL on failure.  In this case @p q may be NULL but
 283  * MIGHT also be some subset of the queue.  For consistent behavior it should
 284  * be ignored in the error case.
 285  */
 286 typedef void disorder_eclient_queue_response(void *v,
 287                                              const char *err,
 288                                              struct queue_entry *q);
 289
 290 /** @brief List request completion callback
 291  * @param v User data
 292  * @param err Error string or NULL on success
 293  * @param nvec Number of elements in response list
 294  * @param vec Pointer to response list
 295  *
 296  * @p error will be NULL on success.  In this case @p nvec and @p vec will give
 297  * the result, or be -1 and NULL respectively e.g. from
 298  * disorder_eclient_playlist_get() if there is no such playlist.
 299  *
 300  * @p error will be non-NULL on failure.  In this case @p nvec and @p vec will
 301  * be 0 and NULL.
 302  */
 303 typedef void disorder_eclient_list_response(void *v,
 304                                             const char *err,
 305                                             int nvec, char **vec);
 306
 307 disorder_eclient *disorder_eclient_new(const disorder_eclient_callbacks *cb,
 308                                        void *u);
 309 /* Create a new client */
 310
 311 void disorder_eclient_close(disorder_eclient *c);
 312 /* Close C */
 313
 314 unsigned long disorder_eclient_state(const disorder_eclient *c);
 315
 316 void disorder_eclient_polled(disorder_eclient *c, unsigned mode);
 317 /* Should be called when c's FD is readable and/or writable, and in any case
 318  * from time to time (so that retries work). */
 319
 320 int disorder_eclient_version(disorder_eclient *c,
 321                              disorder_eclient_string_response *completed,
 322                              void *v);
 323 /* fetch the server version */
 324
 325 int disorder_eclient_play(disorder_eclient *c,
 326                           const char *track,
 327                           disorder_eclient_no_response *completed,
 328                           void *v);
 329 /* add a track to the queue */
 330
 331 int disorder_eclient_playafter(disorder_eclient *c,
 332                                const char *target,
 333                                int ntracks,
 334                                const char **tracks,
 335                                disorder_eclient_no_response *completed,
 336                                void *v);
 337 /* insert multiple tracks to an arbitrary point in the queue */
 338
 339 int disorder_eclient_pause(disorder_eclient *c,
 340                            disorder_eclient_no_response *completed,
 341                            void *v);
 342 /* add a track to the queue */
 343
 344 int disorder_eclient_resume(disorder_eclient *c,
 345                             disorder_eclient_no_response *completed,
 346                             void *v);
 347 /* add a track to the queue */
 348
 349 int disorder_eclient_scratch(disorder_eclient *c,
 350                              const char *id,
 351                              disorder_eclient_no_response *completed,
 352                              void *v);
 353 /* scratch a track by ID */
 354
 355 int disorder_eclient_scratch_playing(disorder_eclient *c,
 356                                      disorder_eclient_no_response *completed,
 357                                      void *v);
 358 /* scratch the playing track whatever it is */
 359
 360 int disorder_eclient_remove(disorder_eclient *c,
 361                             const char *id,
 362                             disorder_eclient_no_response *completed,
 363                             void *v);
 364 /* remove a track from the queue */
 365
 366 int disorder_eclient_moveafter(disorder_eclient *c,
 367                                const char *target,
 368                                int nids,
 369                                const char **ids,
 370                                disorder_eclient_no_response *completed,
 371                                void *v);
 372 /* move tracks within the queue */
 373
 374 int disorder_eclient_playing(disorder_eclient *c,
 375                              disorder_eclient_queue_response *completed,
 376                              void *v);
 377 /* find the currently playing track (0 for none) */
 378
 379 int disorder_eclient_queue(disorder_eclient *c,
 380                            disorder_eclient_queue_response *completed,
 381                            void *v);
 382 /* list recently played tracks */
 383
 384 int disorder_eclient_recent(disorder_eclient *c,
 385                             disorder_eclient_queue_response *completed,
 386                             void *v);
 387 /* list recently played tracks */
 388
 389 int disorder_eclient_files(disorder_eclient *c,
 390                            disorder_eclient_list_response *completed,
 391                            const char *dir,
 392                            const char *re,
 393                            void *v);
 394 /* list files in a directory, matching RE if not a null pointer */
 395
 396 int disorder_eclient_dirs(disorder_eclient *c,
 397                           disorder_eclient_list_response *completed,
 398                           const char *dir,
 399                           const char *re,
 400                           void *v);
 401 /* list directories in a directory, matching RE if not a null pointer */
 402
 403 int disorder_eclient_namepart(disorder_eclient *c,
 404                               disorder_eclient_string_response *completed,
 405                               const char *track,
 406                               const char *context,
 407                               const char *part,
 408                               void *v);
 409 /* look up a track name part */
 410
 411 int disorder_eclient_length(disorder_eclient *c,
 412                             disorder_eclient_integer_response *completed,
 413                             const char *track,
 414                             void *v);
 415 /* look up a track name length */
 416
 417 int disorder_eclient_volume(disorder_eclient *c,
 418                             disorder_eclient_volume_response *callback,
 419                             int l, int r,
 420                             void *v);
 421 /* If L and R are both -ve gets the volume.
 422  * If neither are -ve then sets the volume.
 423  * Otherwise asserts!
 424  */
 425
 426 int disorder_eclient_enable(disorder_eclient *c,
 427                             disorder_eclient_no_response *callback,
 428                             void *v);
 429 int disorder_eclient_disable(disorder_eclient *c,
 430                              disorder_eclient_no_response *callback,
 431                              void *v);
 432 int disorder_eclient_random_enable(disorder_eclient *c,
 433                                    disorder_eclient_no_response *callback,
 434                                    void *v);
 435 int disorder_eclient_random_disable(disorder_eclient *c,
 436                                     disorder_eclient_no_response *callback,
 437                                     void *v);
 438 /* Enable/disable play/random play */
 439
 440 int disorder_eclient_resolve(disorder_eclient *c,
 441                              disorder_eclient_string_response *completed,
 442                              const char *track,
 443                              void *v);
 444 /* Resolve aliases */
 445
 446 int disorder_eclient_log(disorder_eclient *c,
 447                          const disorder_eclient_log_callbacks *callbacks,
 448                          void *v);
 449 /* Make this a log client (forever - it automatically becomes one again upon
 450  * reconnection) */
 451
 452 int disorder_eclient_get(disorder_eclient *c,
 453                          disorder_eclient_string_response *completed,
 454                          const char *track, const char *pref,
 455                          void *v);
 456 int disorder_eclient_set(disorder_eclient *c,
 457                          disorder_eclient_no_response *completed,
 458                          const char *track, const char *pref,
 459                          const char *value,
 460                          void *v);
 461 int disorder_eclient_unset(disorder_eclient *c,
 462                            disorder_eclient_no_response *completed,
 463                            const char *track, const char *pref,
 464                            void *v);
 465 /* Get/set preference values */
 466
 467 int disorder_eclient_get_global(disorder_eclient *c,
 468                                 disorder_eclient_string_response *completed,
 469                                 const char *pref,
 470                                 void *v);
 471 int disorder_eclient_set_global(disorder_eclient *c,
 472                                 disorder_eclient_no_response *completed,
 473                                 const char *pref,
 474                                 const char *value,
 475                                 void *v);
 476 int disorder_eclient_unset_global(disorder_eclient *c,
 477                                   disorder_eclient_no_response *completed,
 478                                   const char *pref,
 479                                   void *v);
 480 /* Get/set global prefs */
 481
 482 int disorder_eclient_search(disorder_eclient *c,
 483                             disorder_eclient_list_response *completed,
 484                             const char *terms,
 485                             void *v);
 486
 487 int disorder_eclient_nop(disorder_eclient *c,
 488                          disorder_eclient_no_response *completed,
 489                          void *v);
 490
 491 int disorder_eclient_new_tracks(disorder_eclient *c,
 492                                 disorder_eclient_list_response *completed,
 493                                 int max,
 494                                 void *v);
 495
 496 int disorder_eclient_rtp_address(disorder_eclient *c,
 497                                  disorder_eclient_list_response *completed,
 498                                  void *v);
 499
 500 int disorder_eclient_users(disorder_eclient *c,
 501                            disorder_eclient_list_response *completed,
 502                            void *v);
 503 int disorder_eclient_deluser(disorder_eclient *c,
 504                              disorder_eclient_no_response *completed,
 505                              const char *user,
 506                              void *v);
 507 int disorder_eclient_userinfo(disorder_eclient *c,
 508                               disorder_eclient_string_response *completed,
 509                               const char *user,
 510                               const char *property,
 511                               void *v);
 512 int disorder_eclient_edituser(disorder_eclient *c,
 513                               disorder_eclient_no_response *completed,
 514                               const char *user,
 515                               const char *property,
 516                               const char *value,
 517                               void *v);
 518 int disorder_eclient_adduser(disorder_eclient *c,
 519                              disorder_eclient_no_response *completed,
 520                              const char *user,
 521                              const char *password,
 522                              const char *rights,
 523                              void *v);
 524 void disorder_eclient_enable_connect(disorder_eclient *c);
 525 void disorder_eclient_disable_connect(disorder_eclient *c);
 526 int disorder_eclient_adopt(disorder_eclient *c,
 527                            disorder_eclient_no_response *completed,
 528                            const char *id,
 529                            void *v);
 530 int disorder_eclient_playlists(disorder_eclient *c,
 531                                disorder_eclient_list_response *completed,
 532                                void *v);
 533 int disorder_eclient_playlist_delete(disorder_eclient *c,
 534                                      disorder_eclient_no_response *completed,
 535                                      const char *playlist,
 536                                      void *v);
 537 int disorder_eclient_playlist_lock(disorder_eclient *c,
 538                                    disorder_eclient_no_response *completed,
 539                                    const char *playlist,
 540                                    void *v);
 541 int disorder_eclient_playlist_unlock(disorder_eclient *c,
 542                                      disorder_eclient_no_response *completed,
 543                                      void *v);
 544 int disorder_eclient_playlist_set_share(disorder_eclient *c,
 545                                         disorder_eclient_no_response *completed,
 546                                         const char *playlist,
 547                                         const char *sharing,
 548                                         void *v);
 549 int disorder_eclient_playlist_get_share(disorder_eclient *c,
 550                                         disorder_eclient_string_response *completed,
 551                                         const char *playlist,
 552                                         void *v);
 553 int disorder_eclient_playlist_set(disorder_eclient *c,
 554                                   disorder_eclient_no_response *completed,
 555                                   const char *playlist,
 556                                   char **tracks,
 557                                   int ntracks,
 558                                   void *v);
 559 int disorder_eclient_playlist_get(disorder_eclient *c,
 560                                   disorder_eclient_list_response *completed,
 561                                   const char *playlist,
 562                                   void *v);
 563
 564 #endif
 565
 566 /*
 567 Local Variables:
 568 c-basic-offset:2
 569 comment-column:40
 570 fill-column:79
 571 indent-tabs-mode:nil
 572 End:
 573 */