mirror of
https://github.com/etcd-io/etcd.git
synced 2024-09-27 06:25:44 +00:00
99 lines
2.7 KiB
Go
99 lines
2.7 KiB
Go
// Copyright 2015 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 etcdserver
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import (
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"io"
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pb "github.com/coreos/etcd/etcdserver/etcdserverpb"
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"github.com/coreos/etcd/pkg/pbutil"
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"github.com/coreos/etcd/pkg/types"
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"github.com/coreos/etcd/raft/raftpb"
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"github.com/coreos/etcd/snap"
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"github.com/coreos/etcd/wal"
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"github.com/coreos/etcd/wal/walpb"
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)
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type Storage interface {
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// Save function saves ents and state to the underlying stable storage.
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// Save MUST block until st and ents are on stable storage.
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Save(st raftpb.HardState, ents []raftpb.Entry) error
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// SaveSnap function saves snapshot to the underlying stable storage.
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SaveSnap(snap raftpb.Snapshot) error
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// Close closes the Storage and performs finalization.
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Close() error
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}
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type storage struct {
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*wal.WAL
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*snap.Snapshotter
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}
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func NewStorage(w *wal.WAL, s *snap.Snapshotter) Storage {
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return &storage{w, s}
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}
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// SaveSnap saves the snapshot to disk and release the locked
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// wal files since they will not be used.
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func (st *storage) SaveSnap(snap raftpb.Snapshot) error {
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walsnap := walpb.Snapshot{
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Index: snap.Metadata.Index,
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Term: snap.Metadata.Term,
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}
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err := st.WAL.SaveSnapshot(walsnap)
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if err != nil {
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return err
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}
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err = st.Snapshotter.SaveSnap(snap)
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if err != nil {
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return err
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}
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return st.WAL.ReleaseLockTo(snap.Metadata.Index)
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}
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func readWAL(waldir string, snap walpb.Snapshot) (w *wal.WAL, id, cid types.ID, st raftpb.HardState, ents []raftpb.Entry) {
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var (
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err error
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wmetadata []byte
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)
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repaired := false
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for {
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if w, err = wal.Open(waldir, snap); err != nil {
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plog.Fatalf("open wal error: %v", err)
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}
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if wmetadata, st, ents, err = w.ReadAll(); err != nil {
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w.Close()
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// we can only repair ErrUnexpectedEOF and we never repair twice.
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if repaired || err != io.ErrUnexpectedEOF {
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plog.Fatalf("read wal error (%v) and cannot be repaired", err)
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}
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if !wal.Repair(waldir) {
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plog.Fatalf("WAL error (%v) cannot be repaired", err)
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} else {
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plog.Infof("repaired WAL error (%v)", err)
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repaired = true
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}
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continue
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}
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break
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}
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var metadata pb.Metadata
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pbutil.MustUnmarshal(&metadata, wmetadata)
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id = types.ID(metadata.NodeID)
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cid = types.ID(metadata.ClusterID)
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return w, id, cid, st, ents
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}
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