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

   1 /*
   2  * This file is part of DisOrder
   3  * Copyright (C) 2005, 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
  21 #ifndef TRACKDB_INT_H
  22 #define TRACKDB_INT_H
  23
  24 #include <db.h>
  25
  26 #include "trackdb.h"
  27 #include "kvp.h"
  28
  29 struct vector;                          /* forward declaration */
  30
  31 extern DB_ENV *trackdb_env;
  32
  33 extern DB *trackdb_tracksdb;
  34 extern DB *trackdb_prefsdb;
  35 extern DB *trackdb_searchdb;
  36 extern DB *trackdb_tagsdb;
  37 extern DB *trackdb_noticeddb;
  38 extern DB *trackdb_globaldb;
  39 extern DB *trackdb_usersdb;
  40 extern DB *trackdb_scheduledb;
  41 extern DB *trackdb_playlistsdb;
  42
  43 DBC *trackdb_opencursor(DB *db, DB_TXN *tid);
  44 /* open a transaction */
  45
  46 int trackdb_closecursor(DBC *c);
  47 /* close transaction, returns 0 or DB_LOCK_DEADLOCK */
  48
  49 int trackdb_notice(const char *track,
  50                    const char *path);
  51 int trackdb_notice_tid(const char *track,
  52                        const char *path,
  53                        DB_TXN *tid);
  54 /* notice a track; return DB_NOTFOUND if new, else 0.  _tid can return
  55  * DB_LOCK_DEADLOCK too. */
  56
  57 int trackdb_obsolete(const char *track, DB_TXN *tid);
  58 /* obsolete a track */
  59
  60 DB_TXN *trackdb_begin_transaction(void);
  61 void trackdb_abort_transaction(DB_TXN *tid);
  62 void trackdb_commit_transaction(DB_TXN *tid);
  63 /* begin, abort or commit a transaction */
  64
  65 /** @brief Evaluate @p expr in a transaction, looping on deadlock
  66  *
  67  * @c tid will be the transaction handle.  @p e will be the error code.
  68  */
  69 #define WITH_TRANSACTION(expr) do {             \
  70   DB_TXN *tid;                                  \
  71                                                 \
  72   tid = trackdb_begin_transaction();            \
  73   while((e = (expr)) == DB_LOCK_DEADLOCK) {     \
  74     trackdb_abort_transaction(tid);             \
  75     tid = trackdb_begin_transaction();          \
  76   }                                             \
  77   if(e)                                         \
  78     trackdb_abort_transaction(tid);             \
  79   else                                          \
  80     trackdb_commit_transaction(tid);            \
  81 } while(0)
  82
  83 int trackdb_getdata(DB *db,
  84                     const char *track,
  85                     struct kvp **kp,
  86                     DB_TXN *tid);
  87 /* fetch and decode a database entry.  Returns 0, DB_NOTFOUND or
  88  * DB_LOCK_DEADLOCK. */
  89
  90 int trackdb_putdata(DB *db,
  91                     const char *track,
  92                     const struct kvp *k,
  93                     DB_TXN *tid,
  94                     u_int32_t flags);
  95 /* encode and store a database entry.  Returns 0, DB_KEYEXIST or
  96  * DB_LOCK_DEADLOCK. */
  97
  98 int trackdb_delkey(DB *db,
  99                    const char *track,
 100                    DB_TXN *tid);
 101 /* delete a database entry.  Returns 0, DB_NOTFOUND or DB_LOCK_DEADLOCK. */
 102
 103 int trackdb_delkeydata(DB *db,
 104                        const char *word,
 105                        const char *track,
 106                        DB_TXN *tid);
 107 /* delete a (key,data) pair.  Returns 0, DB_NOTFOUND or DB_LOCK_DEADLOCK. */
 108
 109 int trackdb_scan(const char *root,
 110                  int (*callback)(const char *track,
 111                                  struct kvp *data,
 112                                  struct kvp *prefs,
 113                                  void *u,
 114                                  DB_TXN *tid),
 115                  void *u,
 116                  DB_TXN *tid);
 117 /* Call CALLBACK for each non-alias track below ROOT (or all tracks if ROOT is
 118  * 0).  Return 0 or DB_LOCK_DEADLOCK.  CALLBACK should return 0 on success or
 119  * EINTR to cancel the scan. */
 120
 121 int trackdb_listkeys(DB *db, struct vector *v, DB_TXN *tid);
 122
 123 /* fill KEY in with S, returns KEY */
 124 static inline DBT *make_key(DBT *key, const char *s) {
 125   memset(key, 0, sizeof *key);
 126   key->data = (void *)s;
 127   key->size = strlen(s);
 128   return key;
 129 }
 130
 131 /* set DATA up to receive data, returns DATA */
 132 static inline DBT *prepare_data(DBT *data) {
 133   memset(data, 0, sizeof *data);
 134   data->flags = DB_DBT_MALLOC;
 135   return data;
 136 }
 137
 138 /* encode K and store in DATA, returns DATA */
 139 static inline DBT *encode_data(DBT *data, const struct kvp *k) {
 140   size_t size;
 141
 142   memset(data, 0, sizeof *data);
 143   data->data = kvp_urlencode(k, &size);
 144   data->size = size;
 145   return data;
 146 }
 147
 148 int trackdb_set_global_tid(const char *name,
 149                            const char *value,
 150                            DB_TXN *tid);
 151 int trackdb_get_global_tid(const char *name,
 152                            DB_TXN *tid,
 153                            const char **rp);
 154
 155 char **parsetags(const char *s);
 156 int tag_intersection(char **a, char **b);
 157 int valid_username(const char *user);
 158
 159 #endif /* TRACKDB_INT_H */
 160
 161 /*
 162 Local Variables:
 163 c-basic-offset:2
 164 comment-column:40
 165 fill-column:79
 166 indent-tabs-mode:nil
 167 End:
 168 */