int olt_unjar(ol_transaction *tx, const char *key, size_t klen, unsigned char **data, size_t *dsize) {
char _key[KEY_SIZE] = {'\0'};
size_t _klen = 0;
ol_database *operating_db = NULL;
ol_bucket *bucket = ol_get_bucket(tx->transaction_db, key, klen, &_key, &_klen);
check(_klen > 0, "Key length of zero not allowed.");
/* Fall through to the parent db: */
if (bucket == NULL) {
bucket = ol_get_bucket(tx->parent_db, key, klen, &_key, &_klen);
/* This is getting messy... */
if (bucket != NULL)
operating_db = tx->parent_db;
} else {
operating_db = tx->transaction_db;
}
if (bucket != NULL) {
if (!_has_bucket_expired(bucket)) {
/* We don't need to fill out the data so just return 'we found the key'. */
if (data == NULL)
return OL_SUCCESS;
const int ret = _ol_get_value_from_bucket(operating_db, bucket, data, dsize);
check(ret == 0, "Could not retrieve value from bucket.");
/* Key found, tell somebody. */
return OL_SUCCESS;
} else {
/* It's dead, get rid of it. */
/* NOTE: We explicitly say the transaction_db here because ITS A
* F*****G TRANSACTION. ACID, bro. */
check(olt_scoop(tx, key, klen) == 0, "Scoop failed");
}
}
/* TODO: Set error code here (could not find key) */
return OL_FAILURE;
error:
/* TODO: Set error code here (generic error? Theres a couple failure modes here.)*/
return OL_FAILURE;
}
struct tm *ol_sniff(ol_database *db, const char *key, size_t klen) {
char _key[KEY_SIZE] = {'\0'};
size_t _klen = 0;
ol_bucket *bucket = ol_get_bucket(db, key, klen, &_key, &_klen);
check_warn(_klen > 0, "Key length of zero not allowed.");
if (bucket != NULL && bucket->expiration != NULL) {
if (!_has_bucket_expired(bucket)) {
return bucket->expiration;
} else {
/* It's dead, get rid of it. */
check(ol_scoop(db, key, klen) == 0, "Could not delete a bucket!")
}
}
error:
return NULL;
}
int ol_cas(ol_database *db, const char *key, const size_t klen,
unsigned char *value, size_t vsize,
const unsigned char *ovalue, const size_t ovsize) {
char _key[KEY_SIZE] = {'\0'};
size_t _klen = 0;
ol_bucket *bucket = ol_get_bucket(db, key, klen, &_key, &_klen);
check(_klen > 0, "Key length of zero not allowed.");
if (bucket == NULL)
return OL_FAILURE;
/* Quick fail if the two sizes don't match */
if (bucket->original_size != ovsize)
return OL_FAILURE;
/* ATOMIC, GOOOO! */
const unsigned char *data_ptr = db->values + bucket->data_offset;
if (db->is_enabled(OL_F_LZ4, &db->feature_set)) {
char decompressed[bucket->original_size];
memset(decompressed, '\0', bucket->original_size);
int processed = 0;
processed = LZ4_decompress_fast((char *)data_ptr,
(char *)decompressed,
bucket->original_size);
check(processed == bucket->data_size, "Could not decompress data.");
if (memcmp(decompressed, ovalue, ovsize) == 0)
return ol_jar(db, key, klen, value, vsize);
} else {
if (memcmp(data_ptr, ovalue, ovsize) == 0)
return ol_jar(db, key, klen, value, vsize);
}
return OL_FAILURE;
error:
return OL_FAILURE;
}
int olt_spoil(ol_transaction *tx, const char *key, size_t klen, struct tm *expiration_date) {
char _key[KEY_SIZE] = {'\0'};
size_t _klen = 0;
ol_database *operating_db = tx->transaction_db;
ol_bucket *bucket = ol_get_bucket(operating_db, key, klen, &_key, &_klen);
check(_klen > 0, "Key length of zero not allowed.");
if (bucket == NULL && tx->parent_db != NULL) {
/* Transaction DB doesn't have this key, but the parent does. */
operating_db = tx->parent_db;
bucket = ol_get_bucket(operating_db, key, klen, &_key, &_klen);
if (bucket != NULL) {
/* Copy that value into our current transaction db,
* and then spoil it.
*/
uint32_t hash;
MurmurHash3_x86_32(_key, _klen, DEVILS_SEED, &hash);
ol_bucket *copied = malloc(sizeof(ol_bucket));
check_mem(copied);
memcpy(copied, bucket, sizeof(ol_bucket));
copied->next = NULL;
copied->key = malloc(_klen + 1);
check_mem(copied->key);
copied->key[_klen] = '\0';
memcpy(copied->key, bucket->key, _klen);
_ol_set_bucket_no_incr(tx->transaction_db, copied, hash);
}
}
if (bucket != NULL) {
if (bucket->expiration == NULL)
bucket->expiration = malloc(sizeof(struct tm));
else
debug("Hmmm, bucket->expiration wasn't null.");
memcpy(bucket->expiration, expiration_date, sizeof(struct tm));
debug("New expiration time: %lu", (long)mktime(bucket->expiration));
#ifdef DEBUG
struct tm utctime;
time_t current;
/* So dumb */
time(¤t);
gmtime_r(¤t, &utctime);
current = timegm(&utctime);
debug("Current time: %lu", (long)current);
#endif
if (operating_db->is_enabled(OL_F_APPENDONLY, &operating_db->feature_set) &&
operating_db->state != OL_S_STARTUP) {
ol_aol_write_cmd(operating_db, "SPOIL", bucket);
}
/* Flag the transaction as dirty. */
tx->dirty = 1;
return OL_SUCCESS;
}
return OL_FAILURE;
error:
return OL_FAILURE;
}
int olt_jar(ol_transaction *tx, const char *key, size_t klen, const unsigned char *value, size_t vsize) {
int ret;
char _key[KEY_SIZE] = {'\0'};
size_t _klen = 0;
ol_database *db = tx->transaction_db;
ol_bucket *bucket = ol_get_bucket(db, key, klen, &_key, &_klen);
check(_klen > 0, "Key length of zero not allowed.");
/* We only want to hit this codepath within the same database, otherwise
* weird stuff happens. Like fires and stuff.
*/
if (bucket != NULL) {
/* Flag the transaction as dirty. */
tx->dirty = 1;
return _ol_reallocate_bucket(db, bucket, value, vsize);
}
/* Looks like we don't have an old hash */
ol_bucket *new_bucket = calloc(1, sizeof(ol_bucket));
if (new_bucket == NULL)
return OL_FAILURE;
/* copy _key into new bucket */
new_bucket->key = malloc(_klen + 1);
check_mem(new_bucket->key);
new_bucket->key[_klen] = '\0';
if (strncpy(new_bucket->key, _key, _klen) != new_bucket->key) {
free(new_bucket);
return OL_FAILURE;
}
new_bucket->klen = _klen;
new_bucket->original_size = vsize;
/* Compute the new position of the data in the values file: */
const size_t new_offset = db->val_size;
if (db->state != OL_S_STARTUP) {
unsigned char *new_data_ptr = NULL;
if (db->is_enabled(OL_F_LZ4, &db->feature_set)) {
/* Compress using LZ4 if enabled */
int maxoutsize = LZ4_compressBound(vsize);
_ol_ensure_values_file_size(db, maxoutsize);
new_data_ptr = db->values + db->val_size;
memset(new_data_ptr, '\0', maxoutsize);
/* All these f*****g casts */
size_t cmsize = (size_t)LZ4_compress((char*)value, (char*)new_data_ptr,
(int)vsize);
if (cmsize == 0) {
/* Free allocated data */
free(new_bucket);
return OL_FAILURE;
}
new_bucket->data_size = cmsize;
} else {
new_bucket->data_size = vsize;
_ol_ensure_values_file_size(db, new_bucket->data_size);
new_data_ptr = db->values + db->val_size;
memset(new_data_ptr, '\0', new_bucket->data_size);
if (memcpy(new_data_ptr, value, vsize) != new_data_ptr) {
/* Free allocated memory since we're not going to use them */
free(new_bucket);
return OL_FAILURE;
}
}
} else {
/* We still need to set the data size, but not the actual data. */
if (db->is_enabled(OL_F_LZ4, &db->feature_set)) {
/* Since LZ4_compressBound only provides the worst case scenario
* and not what the data actually compressed to (we're replaying
* the AOL file, remember?) we have to compress it again and grab
* the amount of bytes processed.
* TODO: This is dumb. Make a function that just sets the bucket size.
* This new mythical function should also handle setting the data_offset
* of the bucket.
*/
int maxoutsize = LZ4_compressBound(vsize);
char tmp_data[maxoutsize];
/* Don't need to memset tmp_data because I don't care about it. */
size_t cmsize = (size_t)LZ4_compress((char *)value, (char *)tmp_data,
(int)vsize);
new_bucket->data_size = cmsize;
} else {
new_bucket->data_size = vsize;
}
}
/* Set the offset of the bucket before we increment it offset globally. */
new_bucket->data_offset = new_offset;
/* Remember to increment the tracked data size of the DB. */
db->val_size += new_bucket->data_size;
unsigned int bucket_max = ol_ht_bucket_max(db->cur_ht_size);
/* TODO: rehash this shit at 80% */
if (db->rcrd_cnt > 0 && db->rcrd_cnt == bucket_max) {
debug("Record count is now %i; growing hash table.", db->rcrd_cnt);
ret = _ol_grow_and_rehash_db(db);
if (ret > 0) {
ol_log_msg(LOG_ERR, "Problem rehashing DB. Error code: %i", ret);
free(new_bucket);
return OL_FAILURE;
}
}
uint32_t hash;
MurmurHash3_x86_32(_key, _klen, DEVILS_SEED, &hash);
ret = _ol_set_bucket(db, new_bucket, hash);
if(ret > 0)
ol_log_msg(LOG_ERR, "Problem inserting item: Error code: %i", ret);
if(db->is_enabled(OL_F_APPENDONLY, &db->feature_set) &&
db->state != OL_S_STARTUP) {
ol_aol_write_cmd(db, "JAR", new_bucket);
}
/* Flag the transaction as dirty. */
tx->dirty = 1;
return OL_SUCCESS;
error:
return OL_FAILURE;
}
