mirror of
https://github.com/etcd-io/etcd.git
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60 lines
2.0 KiB
Go
60 lines
2.0 KiB
Go
// Copyright 2021 The etcd Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package schema
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import (
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"encoding/json"
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"log"
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"go.uber.org/zap"
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"go.etcd.io/etcd/server/v3/storage/backend"
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"go.etcd.io/raft/v3/raftpb"
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)
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// MustUnsafeSaveConfStateToBackend persists confState using given transaction (tx).
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// confState in backend is persisted since etcd v3.5.
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func MustUnsafeSaveConfStateToBackend(lg *zap.Logger, tx backend.BatchTx, confState *raftpb.ConfState) {
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confStateBytes, err := json.Marshal(confState)
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if err != nil {
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lg.Panic("Cannot marshal raftpb.ConfState", zap.Stringer("conf-state", confState), zap.Error(err))
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}
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tx.UnsafePut(Meta, MetaConfStateName, confStateBytes)
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}
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// UnsafeConfStateFromBackend retrieves ConfState from the backend.
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// Returns nil if confState in backend is not persisted (e.g. backend writen by <v3.5).
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func UnsafeConfStateFromBackend(lg *zap.Logger, tx backend.ReadTx) *raftpb.ConfState {
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keys, vals := tx.UnsafeRange(Meta, MetaConfStateName, nil, 0)
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if len(keys) == 0 {
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return nil
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}
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if len(keys) != 1 {
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lg.Panic(
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"unexpected number of key: "+string(MetaConfStateName)+" when getting cluster version from backend",
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zap.Int("number-of-key", len(keys)),
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)
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}
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var confState raftpb.ConfState
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if err := json.Unmarshal(vals[0], &confState); err != nil {
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log.Panic("Cannot unmarshal confState json retrieved from the backend",
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zap.ByteString("conf-state-json", vals[0]),
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zap.Error(err))
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}
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return &confState
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}
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