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

   1 /*
   2  * This file is part of DisOrder.
   3  * Copyright (C) 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 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  60    * This call is obsolete at least in its current form, in which it is used to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 } disorder_eclient_log_callbacks;
 169
 170 /* State bits */
 171
 172 /** @brief Play is enabled */
 173 #define DISORDER_PLAYING_ENABLED  0x00000001
 174
 175 /** @brief Random play is enabled */
 176 #define DISORDER_RANDOM_ENABLED   0x00000002
 177
 178 /** @brief Track is paused
 179  *
 180  * This is only meaningful if @ref DISORDER_PLAYING is set
 181  */
 182 #define DISORDER_TRACK_PAUSED     0x00000004
 183
 184 /** @brief Track is playing
 185  *
 186  * This can be set even if the current track is paused (in which case @ref
 187  * DISORDER_TRACK_PAUSED) will also be set.
 188  */
 189 #define DISORDER_PLAYING    0x00000008
 190
 191 /** @brief Connected to server
 192  *
 193  * By connected it is meant that commands have a reasonable chance of being
 194  * processed soon, not merely that a TCP connection exists - for instance if
 195  * the client is still authenticating then that does not count as connected.
 196  */
 197 #define DISORDER_CONNECTED        0x00000010
 198
 199 char *disorder_eclient_interpret_state(unsigned long statebits);
 200
 201 struct queue_entry;
 202 struct kvp;
 203 struct sink;
 204
 205 /* Completion callbacks.  These provide the result of operations to the caller.
 206  * Unlike in earlier releases, these are not allowed to be NULL. */
 207
 208 /** @brief Trivial completion callback
 209  * @param v User data
 210  * @param err Error string or NULL on succes
 211  */
 212 typedef void disorder_eclient_no_response(void *v,
 213                                           const char *err);
 214
 215 /** @brief String result completion callback
 216  * @param v User data
 217  * @param err Error string or NULL on succes
 218  * @param value Result or NULL
 219  *
 220  * @p error will be NULL on success.  In this case @p value will be the result
 221  * (which might be NULL for disorder_eclient_get(),
 222  * disorder_eclient_get_global() and disorder_eclient_userinfo()).
 223  *
 224  * @p error will be non-NULL on failure.  In this case @p value is always NULL.
 225  */
 226 typedef void disorder_eclient_string_response(void *v,
 227                                               const char *err,
 228                                               const char *value);
 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 0
 234  *
 235  * @p error will be NULL on success.  In this case @p value will be the result.
 236  *
 237  * @p error will be non-NULL on failure.  In this case @p value is always 0.
 238  */
 239 typedef void disorder_eclient_integer_response(void *v,
 240                                                const char *err,
 241                                                long value);
 242 /** @brief Volume completion callback
 243  * @param v User data
 244  * @param err Error string or NULL on success
 245  * @param l Left channel volume
 246  * @param r Right channel volume
 247  *
 248  * @p error will be NULL on success.  In this case @p l and @p r will be the
 249  * result.
 250  *
 251  * @p error will be non-NULL on failure.  In this case @p l and @p r are always
 252  * 0.
 253  */
 254 typedef void disorder_eclient_volume_response(void *v,
 255                                               const char *err,
 256                                               int l, int r);
 257
 258 /** @brief Queue request completion callback
 259  * @param v User data
 260  * @param err Error string or NULL on success
 261  * @param q Head of queue data list
 262  *
 263  * @p error will be NULL on success.  In this case @p q will be the (head of
 264  * the) result.
 265  *
 266  * @p error will be non-NULL on failure.  In this case @p q may be NULL but
 267  * MIGHT also be some subset of the queue.  For consistent behavior it should
 268  * be ignored in the error case.
 269  */
 270 typedef void disorder_eclient_queue_response(void *v,
 271                                              const char *err,
 272                                              struct queue_entry *q);
 273
 274 /** @brief List request completion callback
 275  * @param v User data
 276  * @param err Error string or NULL on success
 277  * @param nvec Number of elements in response list
 278  * @param vec Pointer to response list
 279  *
 280  * @p error will be NULL on success.  In this case @p nvec and @p vec will give
 281  * the result.
 282  *
 283  * @p error will be non-NULL on failure.  In this case @p nvec and @p vec will
 284  * be 0 and NULL.
 285  */
 286 typedef void disorder_eclient_list_response(void *v,
 287                                             const char *err,
 288                                             int nvec, char **vec);
 289
 290 disorder_eclient *disorder_eclient_new(const disorder_eclient_callbacks *cb,
 291                                        void *u);
 292 /* Create a new client */
 293
 294 void disorder_eclient_close(disorder_eclient *c);
 295 /* Close C */
 296
 297 unsigned long disorder_eclient_state(const disorder_eclient *c);
 298
 299 void disorder_eclient_polled(disorder_eclient *c, unsigned mode);
 300 /* Should be called when c's FD is readable and/or writable, and in any case
 301  * from time to time (so that retries work). */
 302
 303 int disorder_eclient_version(disorder_eclient *c,
 304                              disorder_eclient_string_response *completed,
 305                              void *v);
 306 /* fetch the server version */
 307
 308 int disorder_eclient_play(disorder_eclient *c,
 309                           const char *track,
 310                           disorder_eclient_no_response *completed,
 311                           void *v);
 312 /* add a track to the queue */
 313
 314 int disorder_eclient_pause(disorder_eclient *c,
 315                            disorder_eclient_no_response *completed,
 316                            void *v);
 317 /* add a track to the queue */
 318
 319 int disorder_eclient_resume(disorder_eclient *c,
 320                             disorder_eclient_no_response *completed,
 321                             void *v);
 322 /* add a track to the queue */
 323
 324 int disorder_eclient_scratch(disorder_eclient *c,
 325                              const char *id,
 326                              disorder_eclient_no_response *completed,
 327                              void *v);
 328 /* scratch a track by ID */
 329
 330 int disorder_eclient_scratch_playing(disorder_eclient *c,
 331                                      disorder_eclient_no_response *completed,
 332                                      void *v);
 333 /* scratch the playing track whatever it is */
 334
 335 int disorder_eclient_remove(disorder_eclient *c,
 336                             const char *id,
 337                             disorder_eclient_no_response *completed,
 338                             void *v);
 339 /* remove a track from the queue */
 340
 341 int disorder_eclient_moveafter(disorder_eclient *c,
 342                                const char *target,
 343                                int nids,
 344                                const char **ids,
 345                                disorder_eclient_no_response *completed,
 346                                void *v);
 347 /* move tracks within the queue */
 348
 349 int disorder_eclient_playing(disorder_eclient *c,
 350                              disorder_eclient_queue_response *completed,
 351                              void *v);
 352 /* find the currently playing track (0 for none) */
 353
 354 int disorder_eclient_queue(disorder_eclient *c,
 355                            disorder_eclient_queue_response *completed,
 356                            void *v);
 357 /* list recently played tracks */
 358
 359 int disorder_eclient_recent(disorder_eclient *c,
 360                             disorder_eclient_queue_response *completed,
 361                             void *v);
 362 /* list recently played tracks */
 363
 364 int disorder_eclient_files(disorder_eclient *c,
 365                            disorder_eclient_list_response *completed,
 366                            const char *dir,
 367                            const char *re,
 368                            void *v);
 369 /* list files in a directory, matching RE if not a null pointer */
 370
 371 int disorder_eclient_dirs(disorder_eclient *c,
 372                           disorder_eclient_list_response *completed,
 373                           const char *dir,
 374                           const char *re,
 375                           void *v);
 376 /* list directories in a directory, matching RE if not a null pointer */
 377
 378 int disorder_eclient_namepart(disorder_eclient *c,
 379                               disorder_eclient_string_response *completed,
 380                               const char *track,
 381                               const char *context,
 382                               const char *part,
 383                               void *v);
 384 /* look up a track name part */
 385
 386 int disorder_eclient_length(disorder_eclient *c,
 387                             disorder_eclient_integer_response *completed,
 388                             const char *track,
 389                             void *v);
 390 /* look up a track name length */
 391
 392 int disorder_eclient_volume(disorder_eclient *c,
 393                             disorder_eclient_volume_response *callback,
 394                             int l, int r,
 395                             void *v);
 396 /* If L and R are both -ve gets the volume.
 397  * If neither are -ve then sets the volume.
 398  * Otherwise asserts!
 399  */
 400
 401 int disorder_eclient_enable(disorder_eclient *c,
 402                             disorder_eclient_no_response *callback,
 403                             void *v);
 404 int disorder_eclient_disable(disorder_eclient *c,
 405                              disorder_eclient_no_response *callback,
 406                              void *v);
 407 int disorder_eclient_random_enable(disorder_eclient *c,
 408                                    disorder_eclient_no_response *callback,
 409                                    void *v);
 410 int disorder_eclient_random_disable(disorder_eclient *c,
 411                                     disorder_eclient_no_response *callback,
 412                                     void *v);
 413 /* Enable/disable play/random play */
 414
 415 int disorder_eclient_resolve(disorder_eclient *c,
 416                              disorder_eclient_string_response *completed,
 417                              const char *track,
 418                              void *v);
 419 /* Resolve aliases */
 420
 421 int disorder_eclient_log(disorder_eclient *c,
 422                          const disorder_eclient_log_callbacks *callbacks,
 423                          void *v);
 424 /* Make this a log client (forever - it automatically becomes one again upon
 425  * reconnection) */
 426
 427 int disorder_eclient_get(disorder_eclient *c,
 428                          disorder_eclient_string_response *completed,
 429                          const char *track, const char *pref,
 430                          void *v);
 431 int disorder_eclient_set(disorder_eclient *c,
 432                          disorder_eclient_no_response *completed,
 433                          const char *track, const char *pref,
 434                          const char *value,
 435                          void *v);
 436 int disorder_eclient_unset(disorder_eclient *c,
 437                            disorder_eclient_no_response *completed,
 438                            const char *track, const char *pref,
 439                            void *v);
 440 /* Get/set preference values */
 441
 442 int disorder_eclient_search(disorder_eclient *c,
 443                             disorder_eclient_list_response *completed,
 444                             const char *terms,
 445                             void *v);
 446
 447 int disorder_eclient_nop(disorder_eclient *c,
 448                          disorder_eclient_no_response *completed,
 449                          void *v);
 450
 451 int disorder_eclient_new_tracks(disorder_eclient *c,
 452                                 disorder_eclient_list_response *completed,
 453                                 int max,
 454                                 void *v);
 455
 456 int disorder_eclient_rtp_address(disorder_eclient *c,
 457                                  disorder_eclient_list_response *completed,
 458                                  void *v);
 459
 460 int disorder_eclient_users(disorder_eclient *c,
 461                            disorder_eclient_list_response *completed,
 462                            void *v);
 463 int disorder_eclient_deluser(disorder_eclient *c,
 464                              disorder_eclient_no_response *completed,
 465                              const char *user,
 466                              void *v);
 467 int disorder_eclient_userinfo(disorder_eclient *c,
 468                               disorder_eclient_string_response *completed,
 469                               const char *user,
 470                               const char *property,
 471                               void *v);
 472 int disorder_eclient_edituser(disorder_eclient *c,
 473                               disorder_eclient_no_response *completed,
 474                               const char *user,
 475                               const char *property,
 476                               const char *value,
 477                               void *v);
 478 int disorder_eclient_adduser(disorder_eclient *c,
 479                              disorder_eclient_no_response *completed,
 480                              const char *user,
 481                              const char *password,
 482                              const char *rights,
 483                              void *v);
 484 void disorder_eclient_enable_connect(disorder_eclient *c);
 485 void disorder_eclient_disable_connect(disorder_eclient *c);
 486
 487 #endif
 488
 489 /*
 490 Local Variables:
 491 c-basic-offset:2
 492 comment-column:40
 493 fill-column:79
 494 indent-tabs-mode:nil
 495 End:
 496 */