github.com/vescale/zgraph@v0.0.0-20230410094002-959c02d50f95/storage/mvcc/key.go (about)

     1  // Copyright 2022 zGraph Authors. All rights reserved.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package mvcc
    16  
    17  import "github.com/vescale/zgraph/codec"
    18  
    19  // Key is the encoded key type with timestamp.
    20  type Key []byte
    21  
    22  // NewKey encodes a key into MvccKey.
    23  func NewKey(key []byte) Key {
    24  	if len(key) == 0 {
    25  		return nil
    26  	}
    27  	return codec.EncodeBytes(nil, key)
    28  }
    29  
    30  // Raw decodes a MvccKey to original key.
    31  func (key Key) Raw() []byte {
    32  	if len(key) == 0 {
    33  		return nil
    34  	}
    35  	_, k, err := codec.DecodeBytes(key, nil)
    36  	if err != nil {
    37  		panic(err)
    38  	}
    39  	return k
    40  }