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/*
Trivial Database 2: traverse function.
Copyright (C) Rusty Russell 2010
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 3 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "private.h"
#include <ccan/likely/likely.h>
_PUBLIC_ int64_t ntdb_traverse_(struct ntdb_context *ntdb,
int (*fn)(struct ntdb_context *,
NTDB_DATA, NTDB_DATA, void *),
void *p)
{
enum NTDB_ERROR ecode;
struct traverse_info tinfo;
NTDB_DATA k, d;
int64_t count = 0;
k.dptr = NULL;
for (ecode = first_in_hash(ntdb, &tinfo, &k, &d.dsize);
ecode == NTDB_SUCCESS;
ecode = next_in_hash(ntdb, &tinfo, &k, &d.dsize)) {
d.dptr = k.dptr + k.dsize;
count++;
if (fn && fn(ntdb, k, d, p)) {
free(k.dptr);
ntdb->last_error = NTDB_SUCCESS;
return count;
}
free(k.dptr);
}
if (ecode != NTDB_ERR_NOEXIST) {
return NTDB_ERR_TO_OFF(ntdb->last_error = ecode);
}
ntdb->last_error = NTDB_SUCCESS;
return count;
}
_PUBLIC_ enum NTDB_ERROR ntdb_firstkey(struct ntdb_context *ntdb, NTDB_DATA *key)
{
struct traverse_info tinfo;
return ntdb->last_error = first_in_hash(ntdb, &tinfo, key, NULL);
}
/* We lock twice, not very efficient. We could keep last key & tinfo cached. */
_PUBLIC_ enum NTDB_ERROR ntdb_nextkey(struct ntdb_context *ntdb, NTDB_DATA *key)
{
struct traverse_info tinfo;
struct hash_info h;
struct ntdb_used_record rec;
tinfo.prev = find_and_lock(ntdb, *key, F_RDLCK, &h, &rec, &tinfo);
free(key->dptr);
if (NTDB_OFF_IS_ERR(tinfo.prev)) {
return ntdb->last_error = NTDB_OFF_TO_ERR(tinfo.prev);
}
ntdb_unlock_hashes(ntdb, h.hlock_start, h.hlock_range, F_RDLCK);
return ntdb->last_error = next_in_hash(ntdb, &tinfo, key, NULL);
}
static int wipe_one(struct ntdb_context *ntdb,
NTDB_DATA key, NTDB_DATA data, enum NTDB_ERROR *ecode)
{
*ecode = ntdb_delete(ntdb, key);
return (*ecode != NTDB_SUCCESS);
}
_PUBLIC_ enum NTDB_ERROR ntdb_wipe_all(struct ntdb_context *ntdb)
{
enum NTDB_ERROR ecode;
int64_t count;
ecode = ntdb_allrecord_lock(ntdb, F_WRLCK, NTDB_LOCK_WAIT, false);
if (ecode != NTDB_SUCCESS)
return ntdb->last_error = ecode;
/* FIXME: Be smarter. */
count = ntdb_traverse(ntdb, wipe_one, &ecode);
if (count < 0)
ecode = NTDB_OFF_TO_ERR(count);
ntdb_allrecord_unlock(ntdb, F_WRLCK);
return ntdb->last_error = ecode;
}
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