blob: 032621aedd9315d9c07611ebb8be6fc304f126a2 [file] [log] [blame]
khenaidoo59ce9dd2019-11-11 13:05:32 -05001// Copyright 2016 The etcd Authors
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
15package mvcc
16
17import (
18 "encoding/binary"
19 "fmt"
20
21 "go.etcd.io/etcd/mvcc/backend"
22 "go.etcd.io/etcd/mvcc/mvccpb"
23)
24
25func UpdateConsistentIndex(be backend.Backend, index uint64) {
26 tx := be.BatchTx()
27 tx.Lock()
28 defer tx.Unlock()
29
30 var oldi uint64
31 _, vs := tx.UnsafeRange(metaBucketName, consistentIndexKeyName, nil, 0)
32 if len(vs) != 0 {
33 oldi = binary.BigEndian.Uint64(vs[0])
34 }
35
36 if index <= oldi {
37 return
38 }
39
40 bs := make([]byte, 8)
41 binary.BigEndian.PutUint64(bs, index)
42 tx.UnsafePut(metaBucketName, consistentIndexKeyName, bs)
43}
44
45func WriteKV(be backend.Backend, kv mvccpb.KeyValue) {
46 ibytes := newRevBytes()
47 revToBytes(revision{main: kv.ModRevision}, ibytes)
48
49 d, err := kv.Marshal()
50 if err != nil {
51 panic(fmt.Errorf("cannot marshal event: %v", err))
52 }
53
54 be.BatchTx().Lock()
55 be.BatchTx().UnsafePut(keyBucketName, ibytes, d)
56 be.BatchTx().Unlock()
57}