summaryrefslogtreecommitdiff
path: root/source3/lib/dbwrap.c
blob: fd924639a98b8139d910e01fac00a6b5197b6563 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
/* 
   Unix SMB/CIFS implementation.
   Database interface wrapper
   Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2006

   Major code contributions from Aleksey Fedoseev (fedoseev@ru.ibm.com)
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "includes.h"
#ifdef CLUSTER_SUPPORT
#include "ctdb_private.h"
#endif
/*
 * Fall back using fetch_locked if no genuine fetch operation is provided
 */

static int dbwrap_fallback_fetch(struct db_context *db, TALLOC_CTX *mem_ctx,
				 TDB_DATA key, TDB_DATA *data)
{
	struct db_record *rec;

	if (!(rec = db->fetch_locked(db, mem_ctx, key))) {
		return -1;
	}

	data->dsize = rec->value.dsize;
	data->dptr = talloc_move(mem_ctx, &rec->value.dptr);
	TALLOC_FREE(rec);
	return 0;
}

/**
 * If you need transaction support use db_open_trans()
 */
struct db_context *db_open(TALLOC_CTX *mem_ctx,
			   const char *name,
			   int hash_size, int tdb_flags,
			   int open_flags, mode_t mode)
{
	struct db_context *result = NULL;
#ifdef CLUSTER_SUPPORT
	const char *sockname = lp_ctdbd_socket();
#endif

#ifdef CLUSTER_SUPPORT
	if(!sockname || !*sockname) {
		sockname = CTDB_PATH;
	}

	if (lp_clustering() && socket_exist(sockname)) {
		const char *partname;
		/* ctdb only wants the file part of the name */
		partname = strrchr(name, '/');
		if (partname) {
			partname++;
		} else {
			partname = name;
		}
		/* allow ctdb for individual databases to be disabled */
		if (lp_parm_bool(-1, "ctdb", partname, True)) {
			result = db_open_ctdb(mem_ctx, partname, hash_size,
					      tdb_flags, open_flags, mode);
			if (result == NULL) {
				DEBUG(0,("failed to attach to ctdb %s\n",
					 partname));
				smb_panic("failed to attach to a ctdb "
					  "database");
			}
		}
	}

#endif

	if (result == NULL) {
		result = db_open_tdb(mem_ctx, name, hash_size,
				     tdb_flags, open_flags, mode);
	}

	if ((result != NULL) && (result->fetch == NULL)) {
		result->fetch = dbwrap_fallback_fetch;
	}

	return result;
}

/**
 * If you use this you can only modify with a transaction
 */
struct db_context *db_open_trans(TALLOC_CTX *mem_ctx,
				 const char *name,
				 int hash_size, int tdb_flags,
				 int open_flags, mode_t mode)
{
	/* TODO: implement this differently */
	return db_open(mem_ctx, name, hash_size, tdb_flags, open_flags, mode);
}

NTSTATUS dbwrap_delete_bystring(struct db_context *db, const char *key)
{
	struct db_record *rec;
	NTSTATUS status;

	rec = db->fetch_locked(db, talloc_tos(), string_term_tdb_data(key));
	if (rec == NULL) {
		return NT_STATUS_NO_MEMORY;
	}
	status = rec->delete_rec(rec);
	TALLOC_FREE(rec);
	return status;
}

NTSTATUS dbwrap_store_bystring(struct db_context *db, const char *key,
			       TDB_DATA data, int flags)
{
	struct db_record *rec;
	NTSTATUS status;

	rec = db->fetch_locked(db, talloc_tos(), string_term_tdb_data(key));
	if (rec == NULL) {
		return NT_STATUS_NO_MEMORY;
	}

	status = rec->store(rec, data, flags);
	TALLOC_FREE(rec);
	return status;
}

TDB_DATA dbwrap_fetch_bystring(struct db_context *db, TALLOC_CTX *mem_ctx,
			       const char *key)
{
	TDB_DATA result;

	if (db->fetch(db, mem_ctx, string_term_tdb_data(key), &result) == -1) {
		return make_tdb_data(NULL, 0);
	}

	return result;
}