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   queue_update();
  87   recent_update();
  88   volume_update();
  89   added_update();
  90 }
  91
  92 /** @brief Called when the client connects
  93  *
  94  * Depending on server and network state the TCP connection to the server may
  95  * go up or down many times during the lifetime of Disobedience.  This function
  96  * is called whenever it connects.
  97  *
  98  * The intent is to use the monitor logic to achieve this in future.
  99  */
 100 static void log_connected(void attribute((unused)) *v) {
 101   /* Don't know what we might have missed while disconnected so update
 102    * everything.  We get this at startup too and this is how we do the initial
 103    * state fetch. */
 104   all_update();
 105 }
 106
 107 /** @brief Called when the current track finishes playing */
 108 static void log_completed(void attribute((unused)) *v,
 109                           const char attribute((unused)) *track) {
 110 }
 111
 112 /** @brief Called when the current track fails */
 113 static void log_failed(void attribute((unused)) *v,
 114                        const char attribute((unused)) *track,
 115                        const char attribute((unused)) *status) {
 116 }
 117
 118 /** @brief Called when some track is moved within the queue */
 119 static void log_moved(void attribute((unused)) *v,
 120                       const char attribute((unused)) *user) {
 121   queue_update();
 122 }
 123
 124 static void log_playing(void attribute((unused)) *v,
 125                         const char attribute((unused)) *track,
 126                         const char attribute((unused)) *user) {
 127 }
 128
 129 /** @brief Called when a track is added to the queue */
 130 static void log_queue(void attribute((unused)) *v,
 131                       struct queue_entry attribute((unused)) *q) {
 132   queue_update();
 133 }
 134
 135 /** @brief Called when a track is added to the recently-played list */
 136 static void log_recent_added(void attribute((unused)) *v,
 137                              struct queue_entry attribute((unused)) *q) {
 138   recent_update();
 139 }
 140
 141 /** @brief Called when a track is removed from the recently-played list
 142  *
 143  * We do nothing here - log_recent_added() suffices.
 144  */
 145 static void log_recent_removed(void attribute((unused)) *v,
 146                                const char attribute((unused)) *id) {
 147   /* nothing - log_recent_added() will trigger the relevant update */
 148 }
 149
 150 /** @brief Called when a track is removed from the queue */
 151 static void log_removed(void attribute((unused)) *v,
 152                         const char attribute((unused)) *id,
 153                         const char attribute((unused)) *user) {
 154
 155   queue_update();
 156 }
 157
 158 /** @brief Called when the current track is scratched */
 159 static void log_scratched(void attribute((unused)) *v,
 160                           const char attribute((unused)) *track,
 161                           const char attribute((unused)) *user) {
 162 }
 163
 164 /** @brief Called when a state change occurs */
 165 static void log_state(void attribute((unused)) *v,
 166                       unsigned long state) {
 167   const struct monitor *m;
 168   unsigned long changes = state ^ last_state;
 169   static int first = 1;
 170
 171   if(first) {
 172     changes = -1UL;
 173     first = 0;
 174   }
 175   D(("log_state old=%s new=%s changed=%s",
 176      disorder_eclient_interpret_state(last_state),
 177      disorder_eclient_interpret_state(state),
 178      disorder_eclient_interpret_state(changes)));
 179   last_state = state;
 180   /* Tell anything that cares about the state change */
 181   for(m = monitors; m; m = m->next) {
 182     if(changes & m->mask)
 183       m->callback(m->u);
 184   }
 185 }
 186
 187 /** @brief Called when volume changes */
 188 static void log_volume(void attribute((unused)) *v,
 189                        int l, int r) {
 190   if(!rtp_supported && (volume_l != l || volume_r != r)) {
 191     volume_l = l;
 192     volume_r = r;
 193     volume_update();
 194   }
 195 }
 196
 197 /** @brief Called when a rescan completes */
 198 static void log_rescanned(void attribute((unused)) *v) {
 199   added_update();
 200 }
 201
 202 /** @brief Add a monitor to the list
 203  * @param callback Function to call
 204  * @param u User data to pass to @p callback
 205  * @param mask Mask of flags that @p callback cares about
 206  *
 207  * Pass @p mask as -1UL to match all flags.
 208  */
 209 void register_monitor(monitor_callback *callback,
 210                       void *u,
 211                       unsigned long mask) {
 212   struct monitor *m = xmalloc(sizeof *m);
 213
 214   m->next = monitors;
 215   m->mask = mask;
 216   m->callback = callback;
 217   m->u = u;
 218   monitors = m;
 219 }
 220
 221 /*
 222 Local Variables:
 223 c-basic-offset:2
 224 comment-column:40
 225 fill-column:79
 226 indent-tabs-mode:nil
 227 End:
 228 */