chiark - git - mdw - 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 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 /** @file lib/eclient.h
  21  * @brief Client code for event-driven programs
  22  */
  23
  24 #ifndef ECLIENT_H
  25 #define ECLIENT_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 (e.g. connected refused) occurs.
  46    * @param u from disorder_eclient_new()
  47    * @param msg error message
  48    */
  49   void (*comms_error)(void *u, const char *msg);
  50
  51   /** @brief Called when a command fails (including initial authorization).
  52    * @param u from disorder_eclient_new()
  53    * @param v from failed command, or NULL if during setup
  54    * @param msg error message
  55    */
  56   void (*protocol_error)(void *u, void *v, int code, const char *msg);
  57
  58   /** @brief Set poll/select flags
  59    * @param u from disorder_eclient_new()
  60    * @param c handle
  61    * @param fd file descriptor
  62    * @param mode bitmap (@ref DISORDER_POLL_READ and/or @ref DISORDER_POLL_WRITE)
  63    *
  64    * Before @p fd is closed you will always get a call with @p mode = 0.
  65    */
  66   void (*poll)(void *u, disorder_eclient *c, int fd, unsigned mode);
  67
  68   /** @brief Report current activity
  69    * @param u from disorder_eclient_new()
  70    * @param msg Current activity or NULL
  71    *
  72    * Called with @p msg = NULL when there's nothing going on.
  73    */
  74   void (*report)(void *u, const char *msg);
  75 } disorder_eclient_callbacks;
  76
  77 /** @brief Callbacks for log clients
  78  *
  79  * All of these are allowed to be a null pointers in which case you don't get
  80  * told about that log event.
  81  *
  82  * See disorder_protocol(5) for full documentation.
  83  */
  84 typedef struct disorder_eclient_log_callbacks {
  85   /** @brief Called on (re-)connection */
  86   void (*connected)(void *v);
  87
  88   void (*completed)(void *v, const char *track);
  89   void (*failed)(void *v, const char *track, const char *status);
  90   void (*moved)(void *v, const char *user);
  91   void (*playing)(void *v, const char *track, const char *user/*maybe 0*/);
  92   void (*queue)(void *v, struct queue_entry *q);
  93   void (*recent_added)(void *v, struct queue_entry *q);
  94   void (*recent_removed)(void *v, const char *id);
  95   void (*removed)(void *v, const char *id, const char *user/*maybe 0*/);
  96   void (*scratched)(void *v, const char *track, const char *user);
  97   void (*state)(void *v, unsigned long state);
  98   void (*volume)(void *v, int left, int right);
  99   void (*rescanned)(void *v);
 100 } disorder_eclient_log_callbacks;
 101
 102 /* State bits */
 103
 104 /** @brief Play is enabled */
 105 #define DISORDER_PLAYING_ENABLED  0x00000001
 106
 107 /** @brief Random play is enabled */
 108 #define DISORDER_RANDOM_ENABLED   0x00000002
 109
 110 /** @brief Track is paused
 111  *
 112  * This is only meaningful if @ref DISORDER_PLAYING is set
 113  */
 114 #define DISORDER_TRACK_PAUSED     0x00000004
 115
 116 /** @brief Track is playing
 117  *
 118  * This can be set even if the current track is paused (in which case @ref
 119  * DISORDER_TRACK_PAUSED) will also be set.
 120  */
 121 #define DISORDER_PLAYING    0x00000008
 122
 123 /** @brief Connected to server
 124  *
 125  * By connected it is meant that commands have a reasonable chance of being
 126  * processed soon, not merely that a TCP connection exists - for instance if
 127  * the client is still authenticating then that does not count as connected.
 128  */
 129 #define DISORDER_CONNECTED        0x00000010
 130
 131 char *disorder_eclient_interpret_state(unsigned long statebits);
 132
 133 struct queue_entry;
 134 struct kvp;
 135 struct sink;
 136
 137 /* Completion callbacks.  These provide the result of operations to the caller.
 138  * It is always allowed for these to be null pointers if you don't care about
 139  * the result. */
 140
 141 typedef void disorder_eclient_no_response(void *v);
 142 /* completion callback with no data */
 143
 144 /** @brief String result completion callback
 145  * @param v User data
 146  * @param value or NULL
 147  *
 148  * @p value can be NULL for disorder_eclient_get(),
 149  * disorder_eclient_get_global() and disorder_eclient_userinfo().
 150  */
 151 typedef void disorder_eclient_string_response(void *v, const char *value);
 152
 153 typedef void disorder_eclient_integer_response(void *v, long value);
 154 /* completion callback with a integer result */
 155
 156 typedef void disorder_eclient_volume_response(void *v, int l, int r);
 157 /* completion callback with a pair of integer results */
 158
 159 typedef void disorder_eclient_queue_response(void *v, struct queue_entry *q);
 160 /* completion callback for queue/recent listing */
 161
 162 typedef void disorder_eclient_list_response(void *v, int nvec, char **vec);
 163 /* completion callback for file listing etc */
 164
 165 disorder_eclient *disorder_eclient_new(const disorder_eclient_callbacks *cb,
 166                                        void *u);
 167 /* Create a new client */
 168
 169 void disorder_eclient_close(disorder_eclient *c);
 170 /* Close C */
 171
 172 unsigned long disorder_eclient_state(const disorder_eclient *c);
 173
 174 void disorder_eclient_polled(disorder_eclient *c, unsigned mode);
 175 /* Should be called when c's FD is readable and/or writable, and in any case
 176  * from time to time (so that retries work). */
 177
 178 int disorder_eclient_version(disorder_eclient *c,
 179                              disorder_eclient_string_response *completed,
 180                              void *v);
 181 /* fetch the server version */
 182
 183 int disorder_eclient_play(disorder_eclient *c,
 184                           const char *track,
 185                           disorder_eclient_no_response *completed,
 186                           void *v);
 187 /* add a track to the queue */
 188
 189 int disorder_eclient_pause(disorder_eclient *c,
 190                            disorder_eclient_no_response *completed,
 191                            void *v);
 192 /* add a track to the queue */
 193
 194 int disorder_eclient_resume(disorder_eclient *c,
 195                             disorder_eclient_no_response *completed,
 196                             void *v);
 197 /* add a track to the queue */
 198
 199 int disorder_eclient_scratch(disorder_eclient *c,
 200                              const char *id,
 201                              disorder_eclient_no_response *completed,
 202                              void *v);
 203 /* scratch a track by ID */
 204
 205 int disorder_eclient_scratch_playing(disorder_eclient *c,
 206                                      disorder_eclient_no_response *completed,
 207                                      void *v);
 208 /* scratch the playing track whatever it is */
 209
 210 int disorder_eclient_remove(disorder_eclient *c,
 211                             const char *id,
 212                             disorder_eclient_no_response *completed,
 213                             void *v);
 214 /* remove a track from the queue */
 215
 216 int disorder_eclient_moveafter(disorder_eclient *c,
 217                                const char *target,
 218                                int nids,
 219                                const char **ids,
 220                                disorder_eclient_no_response *completed,
 221                                void *v);
 222 /* move tracks within the queue */
 223
 224 int disorder_eclient_playing(disorder_eclient *c,
 225                              disorder_eclient_queue_response *completed,
 226                              void *v);
 227 /* find the currently playing track (0 for none) */
 228
 229 int disorder_eclient_queue(disorder_eclient *c,
 230                            disorder_eclient_queue_response *completed,
 231                            void *v);
 232 /* list recently played tracks */
 233
 234 int disorder_eclient_recent(disorder_eclient *c,
 235                             disorder_eclient_queue_response *completed,
 236                             void *v);
 237 /* list recently played tracks */
 238
 239 int disorder_eclient_files(disorder_eclient *c,
 240                            disorder_eclient_list_response *completed,
 241                            const char *dir,
 242                            const char *re,
 243                            void *v);
 244 /* list files in a directory, matching RE if not a null pointer */
 245
 246 int disorder_eclient_dirs(disorder_eclient *c,
 247                           disorder_eclient_list_response *completed,
 248                           const char *dir,
 249                           const char *re,
 250                           void *v);
 251 /* list directories in a directory, matching RE if not a null pointer */
 252
 253 int disorder_eclient_namepart(disorder_eclient *c,
 254                               disorder_eclient_string_response *completed,
 255                               const char *track,
 256                               const char *context,
 257                               const char *part,
 258                               void *v);
 259 /* look up a track name part */
 260
 261 int disorder_eclient_length(disorder_eclient *c,
 262                             disorder_eclient_integer_response *completed,
 263                             const char *track,
 264                             void *v);
 265 /* look up a track name length */
 266
 267 int disorder_eclient_volume(disorder_eclient *c,
 268                             disorder_eclient_volume_response *callback,
 269                             int l, int r,
 270                             void *v);
 271 /* If L and R are both -ve gets the volume.
 272  * If neither are -ve then sets the volume.
 273  * Otherwise asserts!
 274  */
 275
 276 int disorder_eclient_enable(disorder_eclient *c,
 277                             disorder_eclient_no_response *callback,
 278                             void *v);
 279 int disorder_eclient_disable(disorder_eclient *c,
 280                              disorder_eclient_no_response *callback,
 281                              void *v);
 282 int disorder_eclient_random_enable(disorder_eclient *c,
 283                                    disorder_eclient_no_response *callback,
 284                                    void *v);
 285 int disorder_eclient_random_disable(disorder_eclient *c,
 286                                     disorder_eclient_no_response *callback,
 287                                     void *v);
 288 /* Enable/disable play/random play */
 289
 290 int disorder_eclient_resolve(disorder_eclient *c,
 291                              disorder_eclient_string_response *completed,
 292                              const char *track,
 293                              void *v);
 294 /* Resolve aliases */
 295
 296 int disorder_eclient_log(disorder_eclient *c,
 297                          const disorder_eclient_log_callbacks *callbacks,
 298                          void *v);
 299 /* Make this a log client (forever - it automatically becomes one again upon
 300  * reconnection) */
 301
 302 int disorder_eclient_get(disorder_eclient *c,
 303                          disorder_eclient_string_response *completed,
 304                          const char *track, const char *pref,
 305                          void *v);
 306 int disorder_eclient_set(disorder_eclient *c,
 307                          disorder_eclient_no_response *completed,
 308                          const char *track, const char *pref,
 309                          const char *value,
 310                          void *v);
 311 int disorder_eclient_unset(disorder_eclient *c,
 312                            disorder_eclient_no_response *completed,
 313                            const char *track, const char *pref,
 314                            void *v);
 315 /* Get/set preference values */
 316
 317 int disorder_eclient_search(disorder_eclient *c,
 318                             disorder_eclient_list_response *completed,
 319                             const char *terms,
 320                             void *v);
 321
 322 int disorder_eclient_nop(disorder_eclient *c,
 323                          disorder_eclient_no_response *completed,
 324                          void *v);
 325
 326 int disorder_eclient_new_tracks(disorder_eclient *c,
 327                                 disorder_eclient_list_response *completed,
 328                                 int max,
 329                                 void *v);
 330
 331 int disorder_eclient_rtp_address(disorder_eclient *c,
 332                                  disorder_eclient_list_response *completed,
 333                                  void *v);
 334
 335 int disorder_eclient_users(disorder_eclient *c,
 336                            disorder_eclient_list_response *completed,
 337                            void *v);
 338 int disorder_eclient_deluser(disorder_eclient *c,
 339                              disorder_eclient_no_response *completed,
 340                              const char *user,
 341                              void *v);
 342 int disorder_eclient_userinfo(disorder_eclient *c,
 343                               disorder_eclient_string_response *completed,
 344                               const char *user,
 345                               const char *property,
 346                               void *v);
 347 int disorder_eclient_edituser(disorder_eclient *c,
 348                               disorder_eclient_no_response *completed,
 349                               const char *user,
 350                               const char *property,
 351                               const char *value,
 352                               void *v);
 353 int disorder_eclient_adduser(disorder_eclient *c,
 354                              disorder_eclient_no_response *completed,
 355                              const char *user,
 356                              const char *password,
 357                              const char *rights,
 358                              void *v);
 359
 360 #endif
 361
 362 /*
 363 Local Variables:
 364 c-basic-offset:2
 365 comment-column:40
 366 fill-column:79
 367 indent-tabs-mode:nil
 368 End:
 369 */