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freeswitch/libs/apr-util/dbm/apr_dbm_berkeleydb.c
Michael Jerris 3b35430557 add apr-util 1.2.8 to in tree libs 
git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@3734 d0543943-73ff-0310-b7d9-9358b9ac24b2
2006-12-19 20:04:21 +00:00

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/* Copyright 2000-2005 The Apache Software Foundation or its licensors, as
* applicable.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "apr_strings.h"
#define APR_WANT_MEMFUNC
#include "apr_want.h"
#define APU_WANT_DB
#include "apu_want.h"
#if APR_HAVE_STDLIB_H
#include <stdlib.h> /* for abort() */
#endif
#include "apu.h"
#if APU_HAVE_DB
#include "apr_dbm_private.h"
/*
* We pick up all varieties of Berkeley DB through db.h (included through
* apu_select_dbm.h). This code has been compiled/tested against DB1,
* DB_185, DB2, DB3, and DB4.
*/
#if defined(DB_VERSION_MAJOR) && (DB_VERSION_MAJOR == 4)
/* We will treat anything greater than 4.1 as DB4.
* We can treat 4.0 as DB3.
*/
#if defined(DB_VERSION_MINOR) && (DB_VERSION_MINOR >= 1)
#define DB_VER 4
#else
#define DB_VER 3
#endif
#elif defined(DB_VERSION_MAJOR) && (DB_VERSION_MAJOR == 3)
#define DB_VER 3
#elif defined(DB_VERSION_MAJOR) && (DB_VERSION_MAJOR == 2)
#define DB_VER 2
#else
#define DB_VER 1
#endif
typedef struct {
DB *bdb;
#if DB_VER != 1
DBC *curs;
#endif
} real_file_t;
#if DB_VER == 1
#define TXN_ARG
#else
#define TXN_ARG NULL,
#endif
#define GET_BDB(f) (((real_file_t *)(f))->bdb)
#define do_fetch(bdb, k, v) ((*(bdb)->get)(bdb, TXN_ARG &(k), &(v), 0))
#if DB_VER == 1
#include <sys/fcntl.h>
#define APR_DBM_DBMODE_RO O_RDONLY
#define APR_DBM_DBMODE_RW O_RDWR
#define APR_DBM_DBMODE_RWCREATE (O_CREAT | O_RDWR)
#define APR_DBM_DBMODE_RWTRUNC (O_CREAT | O_RDWR | O_TRUNC)
#else
#define APR_DBM_DBMODE_RO DB_RDONLY
#define APR_DBM_DBMODE_RW 0
#define APR_DBM_DBMODE_RWCREATE DB_CREATE
#define APR_DBM_DBMODE_RWTRUNC DB_TRUNCATE
#endif /* DBVER == 1 */
/* --------------------------------------------------------------------------
**
** UTILITY FUNCTIONS
*/
/* map a DB error to an apr_status_t */
static apr_status_t db2s(int dberr)
{
if (dberr != 0) {
/* ### need to fix this */
return APR_OS_START_USEERR + dberr;
}
return APR_SUCCESS;
}
static apr_status_t set_error(apr_dbm_t *dbm, apr_status_t dbm_said)
{
apr_status_t rv = APR_SUCCESS;
/* ### ignore whatever the DBM said (dbm_said); ask it explicitly */
if (dbm_said == APR_SUCCESS) {
dbm->errcode = 0;
dbm->errmsg = NULL;
}
else {
/* ### need to fix. dberr was tossed in db2s(). */
/* ### use db_strerror() */
dbm->errcode = dbm_said;
#if DB_VER == 1 || DB_VER == 2
dbm->errmsg = NULL;
#else
dbm->errmsg = db_strerror(dbm_said - APR_OS_START_USEERR);
#endif
rv = dbm_said;
}
return rv;
}
/* --------------------------------------------------------------------------
**
** DEFINE THE VTABLE FUNCTIONS FOR BERKELEY DB
**
** ### we may need three sets of these: db1, db2, db3
*/
static apr_status_t vt_db_open(apr_dbm_t **pdb, const char *pathname,
apr_int32_t mode, apr_fileperms_t perm,
apr_pool_t *pool)
{
real_file_t file;
int dbmode;
*pdb = NULL;
switch (mode) {
case APR_DBM_READONLY:
dbmode = APR_DBM_DBMODE_RO;
break;
case APR_DBM_READWRITE:
dbmode = APR_DBM_DBMODE_RW;
break;
case APR_DBM_RWCREATE:
dbmode = APR_DBM_DBMODE_RWCREATE;
break;
case APR_DBM_RWTRUNC:
dbmode = APR_DBM_DBMODE_RWTRUNC;
break;
default:
return APR_EINVAL;
}
{
int dberr;
#if DB_VER >= 3
if ((dberr = db_create(&file.bdb, NULL, 0)) == 0) {
if ((dberr = (*file.bdb->open)(file.bdb,
#if DB_VER == 4
NULL,
#endif
pathname, NULL,
DB_HASH, dbmode,
apr_posix_perms2mode(perm))) != 0) {
/* close the DB handler */
(void) (*file.bdb->close)(file.bdb, 0);
}
}
file.curs = NULL;
#elif DB_VER == 2
dberr = db_open(pathname, DB_HASH, dbmode, apr_posix_perms2mode(perm),
NULL, NULL, &file.bdb);
file.curs = NULL;
#else
file.bdb = dbopen(pathname, dbmode, apr_posix_perms2mode(perm),
DB_HASH, NULL);
if (file.bdb == NULL)
return APR_EGENERAL; /* ### need a better error */
dberr = 0;
#endif
if (dberr != 0)
return db2s(dberr);
}
/* we have an open database... return it */
*pdb = apr_pcalloc(pool, sizeof(**pdb));
(*pdb)->pool = pool;
(*pdb)->type = &apr_dbm_type_db;
(*pdb)->file = apr_pmemdup(pool, &file, sizeof(file));
/* ### register a cleanup to close the DBM? */
return APR_SUCCESS;
}
static void vt_db_close(apr_dbm_t *dbm)
{
(*GET_BDB(dbm->file)->close)(GET_BDB(dbm->file)
#if DB_VER != 1
, 0
#endif
);
}
static apr_status_t vt_db_fetch(apr_dbm_t *dbm, apr_datum_t key,
apr_datum_t * pvalue)
{
DBT ckey = { 0 };
DBT rd = { 0 };
int dberr;
ckey.data = key.dptr;
ckey.size = key.dsize;
dberr = do_fetch(GET_BDB(dbm->file), ckey, rd);
/* "not found" is not an error. return zero'd value. */
if (dberr ==
#if DB_VER == 1
RET_SPECIAL
#else
DB_NOTFOUND
#endif
) {
memset(&rd, 0, sizeof(rd));
dberr = 0;
}
pvalue->dptr = rd.data;
pvalue->dsize = rd.size;
/* store the error info into DBM, and return a status code. Also, note
that *pvalue should have been cleared on error. */
return set_error(dbm, db2s(dberr));
}
static apr_status_t vt_db_store(apr_dbm_t *dbm, apr_datum_t key,
apr_datum_t value)
{
apr_status_t rv;
DBT ckey = { 0 };
DBT cvalue = { 0 };
ckey.data = key.dptr;
ckey.size = key.dsize;
cvalue.data = value.dptr;
cvalue.size = value.dsize;
rv = db2s((*GET_BDB(dbm->file)->put)(GET_BDB(dbm->file),
TXN_ARG
&ckey,
&cvalue,
0));
/* store any error info into DBM, and return a status code. */
return set_error(dbm, rv);
}
static apr_status_t vt_db_del(apr_dbm_t *dbm, apr_datum_t key)
{
apr_status_t rv;
DBT ckey = { 0 };
ckey.data = key.dptr;
ckey.size = key.dsize;
rv = db2s((*GET_BDB(dbm->file)->del)(GET_BDB(dbm->file),
TXN_ARG
&ckey,
0));
/* store any error info into DBM, and return a status code. */
return set_error(dbm, rv);
}
static int vt_db_exists(apr_dbm_t *dbm, apr_datum_t key)
{
DBT ckey = { 0 }; /* converted key */
DBT data = { 0 };
int dberr;
ckey.data = key.dptr;
ckey.size = key.dsize;
dberr = do_fetch(GET_BDB(dbm->file), ckey, data);
/* note: the result data is "loaned" to us; we don't need to free it */
/* DB returns DB_NOTFOUND if it doesn't exist. but we want to say
that *any* error means it doesn't exist. */
return dberr == 0;
}
static apr_status_t vt_db_firstkey(apr_dbm_t *dbm, apr_datum_t * pkey)
{
real_file_t *f = dbm->file;
DBT first = { 0 };
DBT data = { 0 };
int dberr;
#if DB_VER == 1
dberr = (*f->bdb->seq)(f->bdb, &first, &data, R_FIRST);
#else
if ((dberr = (*f->bdb->cursor)(f->bdb, NULL, &f->curs
#if DB_VER >= 3 || ((DB_VERSION_MAJOR == 2) && (DB_VERSION_MINOR > 5))
, 0
#endif
)) == 0) {
dberr = (*f->curs->c_get)(f->curs, &first, &data, DB_FIRST);
if (dberr == DB_NOTFOUND) {
memset(&first, 0, sizeof(first));
(*f->curs->c_close)(f->curs);
f->curs = NULL;
dberr = 0;
}
}
#endif
pkey->dptr = first.data;
pkey->dsize = first.size;
/* store any error info into DBM, and return a status code. */
return set_error(dbm, db2s(dberr));
}
static apr_status_t vt_db_nextkey(apr_dbm_t *dbm, apr_datum_t * pkey)
{
real_file_t *f = dbm->file;
DBT ckey = { 0 };
DBT data = { 0 };
int dberr;
ckey.data = pkey->dptr;
ckey.size = pkey->dsize;
#if DB_VER == 1
dberr = (*f->bdb->seq)(f->bdb, &ckey, &data, R_NEXT);
if (dberr == RET_SPECIAL) {
dberr = 0;
ckey.data = NULL;
ckey.size = 0;
}
#else
if (f->curs == NULL)
return APR_EINVAL;
dberr = (*f->curs->c_get)(f->curs, &ckey, &data, DB_NEXT);
if (dberr == DB_NOTFOUND) {
(*f->curs->c_close)(f->curs);
f->curs = NULL;
dberr = 0;
ckey.data = NULL;
ckey.size = 0;
}
#endif
pkey->dptr = ckey.data;
pkey->dsize = ckey.size;
/* store any error info into DBM, and return a status code. */
/* ### or use db2s(dberr) instead of APR_SUCCESS? */
return set_error(dbm, APR_SUCCESS);
}
static void vt_db_freedatum(apr_dbm_t *dbm, apr_datum_t data)
{
/* nothing to do */
}
static void vt_db_usednames(apr_pool_t *pool, const char *pathname,
const char **used1, const char **used2)
{
*used1 = apr_pstrdup(pool, pathname);
*used2 = NULL;
}
APU_DECLARE_DATA const apr_dbm_type_t apr_dbm_type_db = {
"db",
vt_db_open,
vt_db_close,
vt_db_fetch,
vt_db_store,
vt_db_del,
vt_db_exists,
vt_db_firstkey,
vt_db_nextkey,
vt_db_freedatum,
vt_db_usednames
};
#endif /* APU_HAVE_DB */
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