func (option *Options) Set_create_if_missing(flag bool) {
if flag {
C.leveldb_options_set_create_if_missing(option.options, C.uchar(1))
} else {
C.leveldb_options_set_create_if_missing(option.options, C.uchar(0))
}
}
func Open(path string) (*LevelDB, error) {
var err *C.char
db := &LevelDB{}
db.dbOpts = &DBOptions{C.leveldb_options_create()}
db.readOpts = &ReadOptions{C.leveldb_readoptions_create()}
db.writeOpts = &WriteOptions{C.leveldb_writeoptions_create()}
C.leveldb_options_set_create_if_missing(db.dbOpts.Opts, 1)
db.db = C.leveldb_open(db.dbOpts.Opts, C.CString(path), &err)
if db.db == nil {
e := &DBError{}
e.Err = "Open db failed"
return nil, e
}
if err != nil {
e := &DBError{}
e.Err = C.GoString(err)
return db, e
}
return db, nil
}
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
}
// Open LevelDB with given name
func OpenLevelDB(path string) (leveldb *LevelDB, err error) {
cpath := C.CString(path) // convert path to c string
defer C.leveldb_free(unsafe.Pointer(cpath))
// allocate LevelDB Option struct to open
opt := C.leveldb_options_create()
defer C.leveldb_free(unsafe.Pointer(opt))
// set open option
C.leveldb_options_set_create_if_missing(opt, C.uchar(1))
// open leveldb
var cerr *C.char
cleveldb := C.leveldb_open(opt, cpath, &cerr)
if cerr != nil {
defer C.leveldb_free(unsafe.Pointer(cerr))
return nil, errors.New(C.GoString(cerr))
}
return &LevelDB{cleveldb, path}, nil
}
// SetCreateIfMissing causes Open to create a new database on disk if it does
// not already exist.
func (o *Options) SetCreateIfMissing(b bool) {
C.leveldb_options_set_create_if_missing(o.Opt, boolToUchar(b))
}
