Add dbwrap->parse_record
[Samba/gbeck.git] / source3 / lib / dbwrap.c
blob5e7ce6099fc486004d737304f01e784639379675
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 #ifdef CLUSTER_SUPPORT
24 #include "ctdb_private.h"
25 #endif
27 * Fall back using fetch_locked if no genuine fetch operation is provided
30 static int dbwrap_fallback_fetch(struct db_context *db, TALLOC_CTX *mem_ctx,
31 TDB_DATA key, TDB_DATA *data)
33 struct db_record *rec;
35 if (!(rec = db->fetch_locked(db, mem_ctx, key))) {
36 return -1;
39 data->dsize = rec->value.dsize;
40 data->dptr = talloc_move(mem_ctx, &rec->value.dptr);
41 TALLOC_FREE(rec);
42 return 0;
46 * Fall back using fetch if no genuine parse operation is provided
49 static int dbwrap_fallback_parse_record(struct db_context *db, TDB_DATA key,
50 int (*parser)(TDB_DATA key,
51 TDB_DATA data,
52 void *private_data),
53 void *private_data)
55 TDB_DATA data;
56 int res;
58 res = db->fetch(db, talloc_tos(), key, &data);
59 if (res != 0) {
60 return res;
63 res = parser(key, data, private_data);
64 TALLOC_FREE(data.dptr);
65 return res;
68 /**
69 * open a database
71 struct db_context *db_open(TALLOC_CTX *mem_ctx,
72 const char *name,
73 int hash_size, int tdb_flags,
74 int open_flags, mode_t mode)
76 struct db_context *result = NULL;
77 #ifdef CLUSTER_SUPPORT
78 const char *sockname = lp_ctdbd_socket();
79 #endif
81 #ifdef CLUSTER_SUPPORT
82 if(!sockname || !*sockname) {
83 sockname = CTDB_PATH;
86 if (lp_clustering()) {
87 const char *partname;
89 if (!socket_exist(sockname)) {
90 DEBUG(1, ("ctdb socket does not exist - is ctdb not "
91 "running?\n"));
92 return NULL;
95 /* ctdb only wants the file part of the name */
96 partname = strrchr(name, '/');
97 if (partname) {
98 partname++;
99 } else {
100 partname = name;
102 /* allow ctdb for individual databases to be disabled */
103 if (lp_parm_bool(-1, "ctdb", partname, True)) {
104 result = db_open_ctdb(mem_ctx, partname, hash_size,
105 tdb_flags, open_flags, mode);
106 if (result == NULL) {
107 DEBUG(0,("failed to attach to ctdb %s\n",
108 partname));
109 if (errno == 0) {
110 errno = EIO;
112 return NULL;
117 #endif
119 if (result == NULL) {
120 result = db_open_tdb(mem_ctx, name, hash_size,
121 tdb_flags, open_flags, mode);
124 if ((result != NULL) && (result->fetch == NULL)) {
125 result->fetch = dbwrap_fallback_fetch;
127 if ((result != NULL) && (result->parse_record == NULL)) {
128 result->parse_record = dbwrap_fallback_parse_record;
131 return result;
134 NTSTATUS dbwrap_delete(struct db_context *db, TDB_DATA key)
136 struct db_record *rec;
137 NTSTATUS status;
139 rec = db->fetch_locked(db, talloc_tos(), key);
140 if (rec == NULL) {
141 return NT_STATUS_NO_MEMORY;
143 status = rec->delete_rec(rec);
144 TALLOC_FREE(rec);
145 return status;
148 NTSTATUS dbwrap_store(struct db_context *db, TDB_DATA key,
149 TDB_DATA data, int flags)
151 struct db_record *rec;
152 NTSTATUS status;
154 rec = db->fetch_locked(db, talloc_tos(), key);
155 if (rec == NULL) {
156 return NT_STATUS_NO_MEMORY;
159 status = rec->store(rec, data, flags);
160 TALLOC_FREE(rec);
161 return status;
164 TDB_DATA dbwrap_fetch(struct db_context *db, TALLOC_CTX *mem_ctx,
165 TDB_DATA key)
167 TDB_DATA result;
169 if (db->fetch(db, mem_ctx, key, &result) == -1) {
170 return make_tdb_data(NULL, 0);
173 return result;
176 NTSTATUS dbwrap_delete_bystring(struct db_context *db, const char *key)
178 return dbwrap_delete(db, string_term_tdb_data(key));
181 NTSTATUS dbwrap_store_bystring(struct db_context *db, const char *key,
182 TDB_DATA data, int flags)
184 return dbwrap_store(db, string_term_tdb_data(key), data, flags);
187 TDB_DATA dbwrap_fetch_bystring(struct db_context *db, TALLOC_CTX *mem_ctx,
188 const char *key)
190 return dbwrap_fetch(db, mem_ctx, string_term_tdb_data(key));