mdw@git.distorted.org.uk Git - 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  * See @ref lib/eclient-stubs.h for the (generated) per-command entry points.
  22  */
  23
  24 #ifndef ECLIENT_H
  25 #define ECLIENT_H
  26
  27 #include "rights.h"
  28
  29 /* Asynchronous client interface */
  30
  31 /** @brief Handle type */
  32 typedef struct disorder_eclient disorder_eclient;
  33
  34 struct queue_entry;
  35
  36 /** @brief Set to read from the FD */
  37 #define DISORDER_POLL_READ 1u
  38
  39 /** @brief Set to write to the FD */
  40 #define DISORDER_POLL_WRITE 2u
  41
  42 /** @brief Callbacks for all clients
  43  *
  44  * These must all be valid.
  45  */
  46 typedef struct disorder_eclient_callbacks {
  47   /** @brief Called when a communication error occurs.
  48    * @param u from disorder_eclient_new()
  49    * @param msg error message
  50    *
  51    * This might be called at any time, and indicates a low-level error,
  52    * e.g. connection refused by the server.  It does not mean that any requests
  53    * made of the owning eclient will not be fulfilled at some point.
  54    */
  55   void (*comms_error)(void *u, const char *msg);
  56
  57   /** @brief Called when a command fails (including initial authorization).
  58    * @param u from disorder_eclient_new()
  59    * @param v from failed command, or NULL if during setup
  60    * @param msg error message
  61    *
  62    * This call is obsolete at least in its current form, in which it is used to
  63    * report most errors from most requests.  Ultimately requests-specific
  64    * errors will be reported in a request-specific way rather than via this
  65    * generic callback.
  66    */
  67   void (*protocol_error)(void *u, void *v, int code, const char *msg);
  68
  69   /** @brief Set poll/select flags
  70    * @param u from disorder_eclient_new()
  71    * @param c handle
  72    * @param fd file descriptor
  73    * @param mode bitmap (@ref DISORDER_POLL_READ and/or @ref DISORDER_POLL_WRITE)
  74    *
  75    * Before @p fd is closed you will always get a call with @p mode = 0.
  76    */
  77   void (*poll)(void *u, disorder_eclient *c, int fd, unsigned mode);
  78
  79   /** @brief Report current activity
  80    * @param u from disorder_eclient_new()
  81    * @param msg Current activity or NULL
  82    *
  83    * Called with @p msg = NULL when there's nothing going on.
  84    */
  85   void (*report)(void *u, const char *msg);
  86 } disorder_eclient_callbacks;
  87
  88 /** @brief Callbacks for log clients
  89  *
  90  * All of these are allowed to be a null pointers in which case you don't get
  91  * told about that log event.
  92  *
  93  * See disorder_protocol(5) for full documentation.
  94  */
  95 typedef struct disorder_eclient_log_callbacks {
  96   /** @brief Called on (re-)connection */
  97   void (*connected)(void *v);
  98
  99   /** @brief Called when @p track finished playing successfully */
 100   void (*completed)(void *v, const char *track);
 101
 102   /** @brief Called when @p track fails for some reason */
 103   void (*failed)(void *v, const char *track, const char *status);
 104
 105   /** @brief Called when @p user moves some track or tracks in the queue
 106    *
 107    * Fetch the queue again to find out what the new order is - the
 108    * rearrangement could in principle be arbitrarily complicated.
 109    */
 110   void (*moved)(void *v, const char *user);
 111
 112   /** @brief Called when @p track starts playing
 113    *
 114    * @p user might be 0.
 115    */
 116   void (*playing)(void *v, const char *track, const char *user/*maybe 0*/);
 117
 118   /** @brief Called when @p q is added to the queue
 119    *
 120    * Fetch the queue again to find out where the in the queue it was added.
 121    */
 122   void (*queue)(void *v, struct queue_entry *q);
 123
 124   /** @brief Called when @p q is added to the recent list */
 125   void (*recent_added)(void *v, struct queue_entry *q);
 126
 127   /** @brief Called when @p id is removed from the recent list */
 128   void (*recent_removed)(void *v, const char *id);
 129
 130   /** @brief Called when @p id is removed from the queue
 131    *
 132    * @p user might be 0.
 133    */
 134   void (*removed)(void *v, const char *id, const char *user/*maybe 0*/);
 135
 136   /** @brief Called when @p track is scratched */
 137   void (*scratched)(void *v, const char *track, const char *user);
 138
 139   /** @brief Called with the current state whenever it changes
 140    *
 141    * State bits are:
 142    * - @ref DISORDER_PLAYING_ENABLED
 143    * - @ref DISORDER_RANDOM_ENABLED
 144    * - @ref DISORDER_TRACK_PAUSED
 145    * - @ref DISORDER_PLAYING
 146    * - @ref DISORDER_CONNECTED
 147    */
 148   void (*state)(void *v, unsigned long state);
 149
 150   /** @brief Called when the volume changes */
 151   void (*volume)(void *v, int left, int right);
 152
 153   /** @brief Called when a rescan completes */
 154   void (*rescanned)(void *v);
 155
 156   /** @brief Called when a user is created (admins only) */
 157   void (*user_add)(void *v, const char *user);
 158
 159   /** @brief Called when a user is confirmed (admins only) */
 160   void (*user_confirm)(void *v, const char *user);
 161
 162   /** @brief Called when a user is deleted (admins only) */
 163   void (*user_delete)(void *v, const char *user);
 164
 165   /** @brief Called when a user is edited (admins only) */
 166   void (*user_edit)(void *v, const char *user, const char *property);
 167
 168   /** @brief Called when your rights change */
 169   void (*rights_changed)(void *v, rights_type new_rights);
 170
 171   /** @brief Called when a track is adopted */
 172   void (*adopted)(void *v, const char *id, const char *who);
 173
 174   /** @brief Called when a new playlist is created */
 175   void (*playlist_created)(void *v, const char *playlist, const char *sharing);
 176
 177   /** @brief Called when a playlist is modified */
 178   void (*playlist_modified)(void *v, const char *playlist, const char *sharing);
 179
 180   /** @brief Called when a new playlist is deleted */
 181   void (*playlist_deleted)(void *v, const char *playlist);
 182
 183   /** @brief Called when a global pref is changed or delete */
 184   void (*global_pref)(void *v, const char *pref, const char *value/*or NULL*/);
 185 } disorder_eclient_log_callbacks;
 186
 187 /* State bits */
 188
 189 /** @brief Play is enabled */
 190 #define DISORDER_PLAYING_ENABLED  0x00000001
 191
 192 /** @brief Random play is enabled */
 193 #define DISORDER_RANDOM_ENABLED   0x00000002
 194
 195 /** @brief Track is paused
 196  *
 197  * This is only meaningful if @ref DISORDER_PLAYING is set
 198  */
 199 #define DISORDER_TRACK_PAUSED     0x00000004
 200
 201 /** @brief Track is playing
 202  *
 203  * This can be set even if the current track is paused (in which case @ref
 204  * DISORDER_TRACK_PAUSED) will also be set.
 205  */
 206 #define DISORDER_PLAYING    0x00000008
 207
 208 /** @brief Connected to server
 209  *
 210  * By connected it is meant that commands have a reasonable chance of being
 211  * processed soon, not merely that a TCP connection exists - for instance if
 212  * the client is still authenticating then that does not count as connected.
 213  */
 214 #define DISORDER_CONNECTED        0x00000010
 215
 216 char *disorder_eclient_interpret_state(unsigned long statebits);
 217
 218 struct queue_entry;
 219 struct kvp;
 220 struct sink;
 221
 222 /* Completion callbacks.  These provide the result of operations to the caller.
 223  * Unlike in earlier releases, these are not allowed to be NULL. */
 224
 225 /** @brief Trivial completion callback
 226  * @param v User data
 227  * @param err Error string or NULL on succes
 228  */
 229 typedef void disorder_eclient_no_response(void *v,
 230                                           const char *err);
 231
 232 /** @brief String result completion callback
 233  * @param v User data
 234  * @param err Error string or NULL on succes
 235  * @param value Result or NULL
 236  *
 237  * @p error will be NULL on success.  In this case @p value will be the result
 238  * (which might be NULL for disorder_eclient_get(),
 239  * disorder_eclient_get_global(), disorder_eclient_userinfo() and
 240  * disorder_eclient_playlist_get_share()).
 241  *
 242  * @p error will be non-NULL on failure.  In this case @p value is always NULL.
 243  */
 244 typedef void disorder_eclient_string_response(void *v,
 245                                               const char *err,
 246                                               const char *value);
 247
 248 /** @brief Integer result completion callback
 249  * @param v User data
 250  * @param err Error string or NULL on succes
 251  * @param value Result or 0
 252  *
 253  * @p error will be NULL on success.  In this case @p value will be the result.
 254  *
 255  * @p error will be non-NULL on failure.  In this case @p value is always 0.
 256  */
 257 typedef void disorder_eclient_integer_response(void *v,
 258                                                const char *err,
 259                                                long value);
 260 /** @brief Volume completion callback
 261  * @param v User data
 262  * @param err Error string or NULL on success
 263  * @param l Left channel volume
 264  * @param r Right channel volume
 265  *
 266  * @p error will be NULL on success.  In this case @p l and @p r will be the
 267  * result.
 268  *
 269  * @p error will be non-NULL on failure.  In this case @p l and @p r are always
 270  * 0.
 271  */
 272 typedef void disorder_eclient_pair_integer_response(void *v,
 273                                                     const char *err,
 274                                                     long l, long r);
 275
 276 /** @brief Queue request completion callback
 277  * @param v User data
 278  * @param err Error string or NULL on success
 279  * @param q Head of queue data list
 280  *
 281  * @p error will be NULL on success.  In this case @p q will be the (head of
 282  * the) result.
 283  *
 284  * @p error will be non-NULL on failure.  In this case @p q may be NULL but
 285  * MIGHT also be some subset of the queue.  For consistent behavior it should
 286  * be ignored in the error case.
 287  */
 288 typedef void disorder_eclient_queue_response(void *v,
 289                                              const char *err,
 290                                              struct queue_entry *q);
 291
 292 #define disorder_eclient_playing_response disorder_eclient_queue_response
 293
 294 /** @brief List request completion callback
 295  * @param v User data
 296  * @param err Error string or NULL on success
 297  * @param nvec Number of elements in response list
 298  * @param vec Pointer to response list
 299  *
 300  * @p error will be NULL on success.  In this case @p nvec and @p vec will give
 301  * the result, or be -1 and NULL respectively e.g. from
 302  * disorder_eclient_playlist_get() if there is no such playlist.
 303  *
 304  * @p error will be non-NULL on failure.  In this case @p nvec and @p vec will
 305  * be 0 and NULL.
 306  */
 307 typedef void disorder_eclient_list_response(void *v,
 308                                             const char *err,
 309                                             int nvec, char **vec);
 310
 311 disorder_eclient *disorder_eclient_new(const disorder_eclient_callbacks *cb,
 312                                        void *u);
 313 /* Create a new client */
 314
 315 void disorder_eclient_close(disorder_eclient *c);
 316 /* Close C */
 317
 318 unsigned long disorder_eclient_state(const disorder_eclient *c);
 319
 320 void disorder_eclient_polled(disorder_eclient *c, unsigned mode);
 321 /* Should be called when c's FD is readable and/or writable, and in any case
 322  * from time to time (so that retries work). */
 323
 324 int disorder_eclient_scratch_playing(disorder_eclient *c,
 325                                      disorder_eclient_no_response *completed,
 326                                      void *v);
 327 /* scratch the playing track whatever it is */
 328
 329 int disorder_eclient_log(disorder_eclient *c,
 330                          const disorder_eclient_log_callbacks *callbacks,
 331                          void *v);
 332 /* Make this a log client (forever - it automatically becomes one again upon
 333  * reconnection) */
 334
 335 int disorder_eclient_rtp_address(disorder_eclient *c,
 336                                  disorder_eclient_list_response *completed,
 337                                  void *v);
 338
 339 void disorder_eclient_enable_connect(disorder_eclient *c);
 340 void disorder_eclient_disable_connect(disorder_eclient *c);
 341
 342 #include "eclient-stubs.h"
 343
 344 #endif
 345
 346 /*
 347 Local Variables:
 348 c-basic-offset:2
 349 comment-column:40
 350 fill-column:79
 351 indent-tabs-mode:nil
 352 End:
 353 */