2 * This file is part of DisOrder
3 * Copyright (C) 2005, 2007 Richard Kettlewell
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.
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.
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
24 extern DB_ENV *trackdb_env;
26 extern DB *trackdb_tracksdb;
27 extern DB *trackdb_prefsdb;
28 extern DB *trackdb_searchdb;
29 extern DB *trackdb_tagsdb;
30 extern DB *trackdb_noticeddb;
31 extern DB *trackdb_globaldb;
32 extern DB *trackdb_usersdb;
34 DBC *trackdb_opencursor(DB *db, DB_TXN *tid);
35 /* open a transaction */
37 int trackdb_closecursor(DBC *c);
38 /* close transaction, returns 0 or DB_LOCK_DEADLOCK */
40 int trackdb_notice(const char *track,
42 int trackdb_notice_tid(const char *track,
45 /* notice a track; return DB_NOTFOUND if new, else 0. _tid can return
46 * DB_LOCK_DEADLOCK too. */
48 int trackdb_obsolete(const char *track, DB_TXN *tid);
49 /* obsolete a track */
51 DB_TXN *trackdb_begin_transaction(void);
52 void trackdb_abort_transaction(DB_TXN *tid);
53 void trackdb_commit_transaction(DB_TXN *tid);
54 /* begin, abort or commit a transaction */
56 /** @brief Evaluate @p expr in a transaction, looping on deadlock
58 * @c tid will be the transaction handle. @p e will be the error code.
60 #define WITH_TRANSACTION(expr) do { \
63 tid = trackdb_begin_transaction(); \
64 while((e = (expr)) == DB_LOCK_DEADLOCK) { \
65 trackdb_abort_transaction(tid); \
66 tid = trackdb_begin_transaction(); \
69 trackdb_abort_transaction(tid); \
71 trackdb_commit_transaction(tid); \
74 int trackdb_getdata(DB *db,
78 /* fetch and decode a database entry. Returns 0, DB_NOTFOUND or
79 * DB_LOCK_DEADLOCK. */
81 int trackdb_putdata(DB *db,
86 /* encode and store a database entry. Returns 0, DB_KEYEXIST or
87 * DB_LOCK_DEADLOCK. */
89 int trackdb_delkey(DB *db,
92 /* delete a database entry. Returns 0, DB_NOTFOUND or DB_LOCK_DEADLOCK. */
94 int trackdb_delkeydata(DB *db,
98 /* delete a (key,data) pair. Returns 0, DB_NOTFOUND or DB_LOCK_DEADLOCK. */
100 int trackdb_scan(const char *root,
101 int (*callback)(const char *track,
107 /* Call CALLBACK for each non-alias track below ROOT (or all tracks if ROOT is
108 * 0). Return 0 or DB_LOCK_DEADLOCK. CALLBACK should return 0 on success or
109 * EINTR to cancel the scan. */
111 /* fill KEY in with S, returns KEY */
113 static inline DBT *make_key(DBT *key, const char *s) {
114 memset(key, 0, sizeof *key);
115 key->data = (void *)s;
116 key->size = strlen(s);
120 /* set DATA up to receive data, returns DATA */
121 static inline DBT *prepare_data(DBT *data) {
122 memset(data, 0, sizeof *data);
123 data->flags = DB_DBT_MALLOC;
127 /* encode K and store in DATA, returns DATA */
128 static inline DBT *encode_data(DBT *data, const struct kvp *k) {
131 memset(data, 0, sizeof *data);
132 data->data = kvp_urlencode(k, &size);
137 int trackdb_set_global_tid(const char *name,
140 int trackdb_get_global_tid(const char *name,
144 #endif /* TRACKDB_INT_H */