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