mirror of
https://github.com/etcd-io/etcd.git
synced 2024-09-27 06:25:44 +00:00
46 lines
1.3 KiB
Go
46 lines
1.3 KiB
Go
// Copyright 2015 CoreOS, Inc.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package rafthttp
|
|
|
|
import (
|
|
"io"
|
|
)
|
|
|
|
// snapshotStore is the store of snapshot. Caller could put one
|
|
// snapshot into the store, and get it later.
|
|
// snapshotStore stores at most one snapshot at a time, or it panics.
|
|
type snapshotStore struct {
|
|
rc io.ReadCloser
|
|
// index of the stored snapshot
|
|
// index is 0 if and only if there is no snapshot stored.
|
|
index uint64
|
|
}
|
|
|
|
func (s *snapshotStore) put(rc io.ReadCloser, index uint64) {
|
|
if s.index != 0 {
|
|
plog.Panicf("unexpected put when there is one snapshot stored")
|
|
}
|
|
s.rc, s.index = rc, index
|
|
}
|
|
|
|
func (s *snapshotStore) get(index uint64) io.ReadCloser {
|
|
if s.index == index {
|
|
// set index to 0 to indicate no snapshot stored
|
|
s.index = 0
|
|
return s.rc
|
|
}
|
|
return nil
|
|
}
|