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/* Copyright (C) 2021 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
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 <https://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include "libknot/attribute.h"
#include "libknot/errcode.h"
#include "libknot/db/db_trie.h"
#include "contrib/qp-trie/trie.h"
#include "contrib/mempattern.h"
static int init(knot_db_t **db, knot_mm_t *mm, void *arg)
{
if (db == NULL || arg == NULL) {
return KNOT_EINVAL;
}
_unused_ struct knot_db_trie_opts *opts = arg;
trie_t *trie = trie_create(mm);
if (!trie) {
return KNOT_ENOMEM;
}
*db = trie;
return KNOT_EOK;
}
static void deinit(knot_db_t *db)
{
trie_free((trie_t *)db);
}
static int txn_begin(knot_db_t *db, knot_db_txn_t *txn, unsigned flags)
{
txn->txn = (void *)(size_t)flags;
txn->db = db;
return KNOT_EOK; /* N/A */
}
static int txn_commit(knot_db_txn_t *txn)
{
return KNOT_EOK;
}
static void txn_abort(knot_db_txn_t *txn)
{
}
static int count(knot_db_txn_t *txn)
{
return trie_weight((trie_t *)txn->db);
}
static int clear(knot_db_txn_t *txn)
{
trie_clear((trie_t *)txn->db);
return KNOT_EOK;
}
static int find(knot_db_txn_t *txn, knot_db_val_t *key, knot_db_val_t *val, unsigned flags)
{
trie_val_t *ret = trie_get_try((trie_t *)txn->db, key->data, key->len);
if (ret == NULL) {
return KNOT_ENOENT;
}
val->data = *ret;
val->len = sizeof(trie_val_t); /* Trie doesn't support storing length. */
return KNOT_EOK;
}
static int insert(knot_db_txn_t *txn, knot_db_val_t *key, knot_db_val_t *val, unsigned flags)
{
/* No flags supported. */
if (flags != 0) {
return KNOT_ENOTSUP;
}
trie_val_t *ret = trie_get_ins((trie_t *)txn->db, key->data, key->len);
if (ret == NULL) {
return KNOT_ENOMEM;
}
*ret = val->data;
return KNOT_EOK;
}
static int del(knot_db_txn_t *txn, knot_db_val_t *key)
{
return trie_del((trie_t *)txn->db, key->data, key->len, NULL);
}
static knot_db_iter_t *iter_begin(knot_db_txn_t *txn, unsigned flags)
{
flags &= ~KNOT_DB_SORTED;
/* No operations other than begin are supported right now. */
if (flags != 0) {
return NULL;
}
return trie_it_begin((trie_t *)txn->db);
}
static knot_db_iter_t *iter_seek(knot_db_iter_t *iter, knot_db_val_t *key, unsigned flags)
{
assert(0);
return NULL; /* ENOTSUP */
}
static knot_db_iter_t *iter_next(knot_db_iter_t *iter)
{
trie_it_next((trie_it_t *)iter);
if (trie_it_finished((trie_it_t *)iter)) {
trie_it_free((trie_it_t *)iter);
return NULL;
}
return iter;
}
static int iter_key(knot_db_iter_t *iter, knot_db_val_t *val)
{
val->data = (void *)trie_it_key((trie_it_t *)iter, &val->len);
if (val->data == NULL) {
return KNOT_ENOENT;
}
return KNOT_EOK;
}
static int iter_val(knot_db_iter_t *iter, knot_db_val_t *val)
{
trie_val_t *ret = trie_it_val((trie_it_t *)iter);
if (ret == NULL) {
return KNOT_ENOENT;
}
val->data = *ret;
val->len = sizeof(trie_val_t);
return KNOT_EOK;
}
static void iter_finish(knot_db_iter_t *iter)
{
trie_it_free((trie_it_t *)iter);
}
_public_
const knot_db_api_t *knot_db_trie_api(void)
{
static const knot_db_api_t api = {
"trie",
init, deinit,
txn_begin, txn_commit, txn_abort,
count, clear, find, insert, del,
iter_begin, iter_seek, iter_next, iter_key, iter_val, iter_finish
};
return &api;
}
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