tevent: add tevent_req_defer_callback()
[Samba/gebeck_regimport.git] / source3 / lib / dbwrap.c
blob83fc40efacf14a40ce1b3cebfc43c2b26203e7bb
1 /*
2 Unix SMB/CIFS implementation.
3 Database interface wrapper
4 Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2006
6 Major code contributions from Aleksey Fedoseev (fedoseev@ru.ibm.com)
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
22 #include "includes.h"
23 #include "dbwrap.h"
24 #include "util_tdb.h"
25 #ifdef CLUSTER_SUPPORT
26 #include "ctdb_private.h"
27 #endif
29 * Fall back using fetch_locked if no genuine fetch operation is provided
32 static int dbwrap_fallback_fetch(struct db_context *db, TALLOC_CTX *mem_ctx,
33 TDB_DATA key, TDB_DATA *data)
35 struct db_record *rec;
37 if (!(rec = db->fetch_locked(db, mem_ctx, key))) {
38 return -1;
41 data->dsize = rec->value.dsize;
42 data->dptr = talloc_move(mem_ctx, &rec->value.dptr);
43 TALLOC_FREE(rec);
44 return 0;
48 * Fall back using fetch if no genuine parse operation is provided
51 static int dbwrap_fallback_parse_record(struct db_context *db, TDB_DATA key,
52 int (*parser)(TDB_DATA key,
53 TDB_DATA data,
54 void *private_data),
55 void *private_data)
57 TDB_DATA data;
58 int res;
60 res = db->fetch(db, talloc_tos(), key, &data);
61 if (res != 0) {
62 return res;
65 res = parser(key, data, private_data);
66 TALLOC_FREE(data.dptr);
67 return res;
70 bool db_is_local(const char *name)
72 #ifdef CLUSTER_SUPPORT
73 const char *sockname = lp_ctdbd_socket();
75 if(!sockname || !*sockname) {
76 sockname = CTDB_PATH;
79 if (lp_clustering() && socket_exist(sockname)) {
80 const char *partname;
81 /* ctdb only wants the file part of the name */
82 partname = strrchr(name, '/');
83 if (partname) {
84 partname++;
85 } else {
86 partname = name;
88 /* allow ctdb for individual databases to be disabled */
89 if (lp_parm_bool(-1, "ctdb", partname, True)) {
90 return false;
93 #endif
94 return true;
97 /**
98 * open a database
100 struct db_context *db_open(TALLOC_CTX *mem_ctx,
101 const char *name,
102 int hash_size, int tdb_flags,
103 int open_flags, mode_t mode)
105 struct db_context *result = NULL;
106 #ifdef CLUSTER_SUPPORT
107 const char *sockname = lp_ctdbd_socket();
109 if(!sockname || !*sockname) {
110 sockname = CTDB_PATH;
113 if (lp_clustering()) {
114 const char *partname;
116 if (!socket_exist(sockname)) {
117 DEBUG(1, ("ctdb socket does not exist - is ctdb not "
118 "running?\n"));
119 return NULL;
122 /* ctdb only wants the file part of the name */
123 partname = strrchr(name, '/');
124 if (partname) {
125 partname++;
126 } else {
127 partname = name;
129 /* allow ctdb for individual databases to be disabled */
130 if (lp_parm_bool(-1, "ctdb", partname, True)) {
131 result = db_open_ctdb(mem_ctx, partname, hash_size,
132 tdb_flags, open_flags, mode);
133 if (result == NULL) {
134 DEBUG(0,("failed to attach to ctdb %s\n",
135 partname));
136 if (errno == 0) {
137 errno = EIO;
139 return NULL;
144 #endif
146 if (result == NULL) {
147 result = db_open_tdb(mem_ctx, name, hash_size,
148 tdb_flags, open_flags, mode);
151 if ((result != NULL) && (result->fetch == NULL)) {
152 result->fetch = dbwrap_fallback_fetch;
154 if ((result != NULL) && (result->parse_record == NULL)) {
155 result->parse_record = dbwrap_fallback_parse_record;
158 return result;