func OpenLeveldb(dir string) (*Leveldb, error) {
options := C.leveldb_options_create()
C.leveldb_options_set_create_if_missing(options, C.uchar(1))
cache := C.leveldb_cache_create_lru(levelCacheCap)
C.leveldb_options_set_cache(options, cache)
cDir := C.CString(dir)
defer C.free(unsafe.Pointer(cDir))
var err *C.char
db := C.leveldb_open(options, cDir, &err)
if err != nil {
return nil, errors.New(fmt.Sprintf("%s: %s", err, dir))
}
C.leveldb_free(unsafe.Pointer(err))
err = nil
leveldb := &Leveldb{
cdb: db,
read_options: C.leveldb_readoptions_create(),
write_options: C.leveldb_writeoptions_create(),
cache: cache,
}
return leveldb, nil
}
// NewLRUCache creates a new Cache object with the capacity given.
//
// To prevent memory leaks, Close should be called on the Cache when the
// program no longer needs it. Note: if the process is shutting down, this may
// not be necessary and could be avoided to shorten shutdown time.
func NewLRUCache(capacity int) *Cache {
return &Cache{C.leveldb_cache_create_lru(C.size_t(capacity))}
}