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/*
* Copyright (C) 2018 "IoT.bzh"
* Author José Bollo <jose.bollo@iot.bzh>
*
* 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.
*/
/******************************************************************************/
/******************************************************************************/
/* INTERNAL DATABASE IMPLEMENTATION */
/******************************************************************************/
/******************************************************************************/
#include <assert.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdalign.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <time.h>
#include <errno.h>
#include "data.h"
#include "anydb.h"
#include "filedb.h"
#include "memdb.h"
#include "db.h"
static anydb_t *memdb;
static anydb_t *filedb;
static bool modifiable;
/**
* check whether the 'text' fit String_Any, String_Wide, NULL or ""
* @param text the text to check
* @return true if ANY or WIDE
*/
static
bool
is_any_or_wide(
const char *text
) {
return text == NULL || text[0] == 0
|| (!text[1] && (text[0] == Data_Any_Char || text[0] == Data_Wide_Char));
}
/* see db.h */
int
db_open(
const char *directory
) {
int rc;
rc = memdb_create(&memdb);
if (!rc) {
rc = filedb_create(&filedb, directory, NULL);
if (rc)
anydb_destroy(memdb);
}
return rc;
}
/* see db.h */
void
db_close(
) {
anydb_destroy(filedb);
anydb_destroy(memdb);
}
/* see db.h */
bool
db_is_empty(
) {
return anydb_is_empty(filedb);
}
/* see db.h */
int
db_transaction_begin(
) {
int rc1, rc2, rc;
if (modifiable)
return -EALREADY;
rc1 = anydb_transaction(filedb, Anydb_Transaction_Start);
rc2 = anydb_transaction(memdb, Anydb_Transaction_Start);
rc = rc1 ?: rc2;
modifiable = !rc;
return rc;
}
/* see db.h */
int
db_transaction_end(
bool commit
) {
int rc1, rc2, rc3, rc4;
if (!modifiable)
return -EALREADY;
if (commit) {
rc1 = anydb_transaction(filedb, Anydb_Transaction_Commit);
rc2 = anydb_transaction(memdb, Anydb_Transaction_Commit);
rc3 = db_cleanup();
} else {
rc1 = anydb_transaction(filedb, Anydb_Transaction_Cancel);
rc2 = anydb_transaction(memdb, Anydb_Transaction_Cancel);
rc3 = 0;
}
rc4 = db_sync();
modifiable = false;
return rc1 ?: rc2 ?: rc3 ?: rc4;
}
/* see db.h */
void
db_for_all(
void (*callback)(
void *closure,
const data_key_t *key,
const data_value_t *value),
void *closure,
const data_key_t *key
) {
anydb_for_all(filedb, callback, closure, key);
anydb_for_all(memdb, callback, closure, key);
}
/* see db.h */
int
db_drop(
const data_key_t *key
) {
if (!modifiable)
return -EACCES;
anydb_drop(filedb, key);
anydb_drop(memdb, key);
return 0;
}
/* see db.h */
int
db_set(
const data_key_t *key,
const data_value_t *value
) {
anydb_t *db;
if (!modifiable)
return -EACCES;
db = is_any_or_wide(key->session) ? filedb : memdb;
return anydb_set(db, key, value);
}
/* see db.h */
unsigned
db_test(
const data_key_t *key,
data_value_t *value
) {
unsigned s1, s2;
data_value_t v1, v2;
s1 = anydb_test(memdb, key, &v1);
s2 = anydb_test(filedb, key, &v2);
if (s2 > s1) {
*value = v2;
return s2;
}
if (s1)
*value = v1;
return s1;
}
/* see db.h */
int
db_cleanup(
) {
anydb_cleanup(filedb);
anydb_cleanup(memdb);
return 0;
}
/* see db.h */
int
db_sync(
) {
int rc1 = anydb_sync(filedb);
int rc2 = anydb_sync(memdb);
return rc1 ?: rc2;
}
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