func (d *datastore) Delete(key ds.Key) (err error) {
err = d.DB.Delete(key.Bytes(), nil)
if err == leveldb.ErrNotFound {
return ds.ErrNotFound
}
return err
}
// Returns ErrInvalidType if value is not of type []byte.
//
// Note: using sync = false.
// see http://godoc.org/github.com/syndtr/goleveldb/leveldb/opt#WriteOptions
func (d *datastore) Put(key ds.Key, value interface{}) (err error) {
val, ok := value.([]byte)
if !ok {
return ds.ErrInvalidType
}
return d.DB.Put(key.Bytes(), val, nil)
}
func (d *datastore) Get(key ds.Key) (value interface{}, err error) {
val, err := d.DB.Get(key.Bytes(), nil)
if err != nil {
if err == leveldb.ErrNotFound {
return nil, ds.ErrNotFound
}
return nil, err
}
return val, nil
}
func (d *datastore) Has(key ds.Key) (exists bool, err error) {
return d.DB.Has(key.Bytes(), nil)
}
// Hash a key and return the first 16 hex chars of its blake2b hash.
// basically: Blake2b(key).HexString[:16]
func BlakeKeyHash(key ds.Key) string {
h := blake2.NewBlake2B()
h.Write(key.Bytes())
d := h.Sum(nil)
return fmt.Sprintf("%x", d)[:16]
}