mdw@git.distorted.org.uk Git - disorder/blob - disobedience/log.c

   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 disobedience/log.c
  21  * @brief State monitoring
  22  *
  23  * Disobedience relies on the server to tell when essentially anything changes,
  24  * even if it initiated the change itself.  It uses the @c log command to
  25  * achieve this.
  26  */
  27
  28 #include "disobedience.h"
  29
  30 /* State monitoring -------------------------------------------------------- */
  31
  32 static void log_connected(void *v);
  33 static void log_completed(void *v, const char *track);
  34 static void log_failed(void *v, const char *track, const char *status);
  35 static void log_moved(void *v, const char *user);
  36 static void log_playing(void *v, const char *track, const char *user);
  37 static void log_queue(void *v, struct queue_entry *q);
  38 static void log_recent_added(void *v, struct queue_entry *q);
  39 static void log_recent_removed(void *v, const char *id);
  40 static void log_removed(void *v, const char *id, const char *user);
  41 static void log_scratched(void *v, const char *track, const char *user);
  42 static void log_state(void *v, unsigned long state);
  43 static void log_volume(void *v, int l, int r);
  44 static void log_rescanned(void *v);
  45
  46 /** @brief Callbacks for server state monitoring */
  47 const disorder_eclient_log_callbacks log_callbacks = {
  48   log_connected,
  49   log_completed,
  50   log_failed,
  51   log_moved,
  52   log_playing,
  53   log_queue,
  54   log_recent_added,
  55   log_recent_removed,
  56   log_removed,
  57   log_scratched,
  58   log_state,
  59   log_volume,
  60   log_rescanned
  61 };
  62
  63 /** @brief State monitor
  64  *
  65  * We keep a linked list of everything that is interested in state changes.
  66  */
  67 struct monitor {
  68   /** @brief Next monitor */
  69   struct monitor *next;
  70
  71   /** @brief State bits of interest */
  72   unsigned long mask;
  73
  74   /** @brief Function to call if any of @c mask change */
  75   monitor_callback *callback;
  76
  77   /** @brief User data for callback */
  78   void *u;
  79 };
  80
  81 /** @brief List of monitors */
  82 static struct monitor *monitors;
  83
  84 /** @brief Update everything */
  85 void all_update(void) {
  86   ++suppress_actions;
  87   event_raise("queue-changed", 0);
  88   event_raise("recent-changed", 0);
  89   event_raise("volume-changed", 0);
  90   event_raise("added-changed", 0);
  91   --suppress_actions;
  92 }
  93
  94 /** @brief Called when the client connects
  95  *
  96  * Depending on server and network state the TCP connection to the server may
  97  * go up or down many times during the lifetime of Disobedience.  This function
  98  * is called whenever it connects.
  99  *
 100  * The intent is to use the monitor logic to achieve this in future.
 101  */
 102 static void log_connected(void attribute((unused)) *v) {
 103   /* Don't know what we might have missed while disconnected so update
 104    * everything.  We get this at startup too and this is how we do the initial
 105    * state fetch. */
 106   all_update();
 107 }
 108
 109 /** @brief Called when the current track finishes playing */
 110 static void log_completed(void attribute((unused)) *v,
 111                           const char attribute((unused)) *track) {
 112 }
 113
 114 /** @brief Called when the current track fails */
 115 static void log_failed(void attribute((unused)) *v,
 116                        const char attribute((unused)) *track,
 117                        const char attribute((unused)) *status) {
 118 }
 119
 120 /** @brief Called when some track is moved within the queue */
 121 static void log_moved(void attribute((unused)) *v,
 122                       const char attribute((unused)) *user) {
 123   event_raise("queue-changed", 0);
 124 }
 125
 126 static void log_playing(void attribute((unused)) *v,
 127                         const char attribute((unused)) *track,
 128                         const char attribute((unused)) *user) {
 129 }
 130
 131 /** @brief Called when a track is added to the queue */
 132 static void log_queue(void attribute((unused)) *v,
 133                       struct queue_entry attribute((unused)) *q) {
 134   event_raise("queue-changed", 0);
 135 }
 136
 137 /** @brief Called when a track is added to the recently-played list */
 138 static void log_recent_added(void attribute((unused)) *v,
 139                              struct queue_entry attribute((unused)) *q) {
 140   event_raise("recent-changed", 0);
 141 }
 142
 143 /** @brief Called when a track is removed from the recently-played list
 144  *
 145  * We do nothing here - log_recent_added() suffices.
 146  */
 147 static void log_recent_removed(void attribute((unused)) *v,
 148                                const char attribute((unused)) *id) {
 149   /* nothing - log_recent_added() will trigger the relevant update */
 150 }
 151
 152 /** @brief Called when a track is removed from the queue */
 153 static void log_removed(void attribute((unused)) *v,
 154                         const char attribute((unused)) *id,
 155                         const char attribute((unused)) *user) {
 156   event_raise("queue-changed", 0);
 157 }
 158
 159 /** @brief Called when the current track is scratched */
 160 static void log_scratched(void attribute((unused)) *v,
 161                           const char attribute((unused)) *track,
 162                           const char attribute((unused)) *user) {
 163 }
 164
 165 /** @brief Map from state bits to state change events */
 166 static const struct {
 167   unsigned long bit;
 168   const char *event;
 169 } state_events[] = {
 170   { DISORDER_PLAYING_ENABLED, "enabled-changed" },
 171   { DISORDER_RANDOM_ENABLED, "random-changed" },
 172   { DISORDER_TRACK_PAUSED, "pause-changed" },
 173   { DISORDER_PLAYING, "playing-changed" },
 174 };
 175 #define NSTATE_EVENTS (sizeof state_events / sizeof *state_events)
 176
 177 /** @brief Called when a state change occurs */
 178 static void log_state(void attribute((unused)) *v,
 179                       unsigned long state) {
 180   const struct monitor *m;
 181   unsigned long changes = state ^ last_state;
 182   static int first = 1;
 183
 184   ++suppress_actions;
 185   if(first) {
 186     changes = -1UL;
 187     first = 0;
 188   }
 189   D(("log_state old=%s new=%s changed=%s",
 190      disorder_eclient_interpret_state(last_state),
 191      disorder_eclient_interpret_state(state),
 192      disorder_eclient_interpret_state(changes)));
 193   last_state = state;
 194   /* Notify interested parties what has changed */
 195   for(unsigned n = 0; n < NSTATE_EVENTS; ++n)
 196     if(changes & state_events[n].bit)
 197       event_raise(state_events[n].event, 0);
 198   /* Tell anything that cares about the state change */
 199   for(m = monitors; m; m = m->next) {
 200     if(changes & m->mask)
 201       m->callback(m->u);
 202   }
 203   --suppress_actions;
 204 }
 205
 206 /** @brief Called when volume changes */
 207 static void log_volume(void attribute((unused)) *v,
 208                        int l, int r) {
 209   if(!rtp_supported && (volume_l != l || volume_r != r)) {
 210     volume_l = l;
 211     volume_r = r;
 212     ++suppress_actions;
 213     event_raise("volume-changed", 0);
 214     --suppress_actions;
 215   }
 216 }
 217
 218 /** @brief Called when a rescan completes */
 219 static void log_rescanned(void attribute((unused)) *v) {
 220   event_raise("added-changed", 0);
 221 }
 222
 223 /** @brief Add a monitor to the list
 224  * @param callback Function to call
 225  * @param u User data to pass to @p callback
 226  * @param mask Mask of flags that @p callback cares about
 227  *
 228  * Pass @p mask as -1UL to match all flags.
 229  */
 230 void register_monitor(monitor_callback *callback,
 231                       void *u,
 232                       unsigned long mask) {
 233   struct monitor *m = xmalloc(sizeof *m);
 234
 235   m->next = monitors;
 236   m->mask = mask;
 237   m->callback = callback;
 238   m->u = u;
 239   monitors = m;
 240 }
 241
 242 /*
 243 Local Variables:
 244 c-basic-offset:2
 245 comment-column:40
 246 fill-column:79
 247 indent-tabs-mode:nil
 248 End:
 249 */