152 lines
3.9 KiB
Go
152 lines
3.9 KiB
Go
// Copyright 2015 CoreOS, Inc.
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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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"log"
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"os"
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"path"
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pb "github.com/coreos/etcd/etcdserver/etcdserverpb"
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"github.com/coreos/etcd/migrate"
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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/version"
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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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err = st.WAL.ReleaseLockTo(snap.Metadata.Index)
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if err != nil {
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return err
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}
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return nil
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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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for i := 0; i < 2; i++ {
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if w, err = wal.Open(waldir, snap); err != nil {
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log.Fatalf("etcdserver: 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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if i != 0 || err != io.ErrUnexpectedEOF {
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log.Fatalf("etcdserver: read wal error: %v", err)
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}
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if !wal.Repair(waldir) {
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log.Fatalf("etcdserver: WAL error (%v) cannot be repaired", err)
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} else {
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log.Printf("etcdserver: repaired WAL error (%v)", err)
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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
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}
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// upgradeWAL converts an older version of the etcdServer data to the newest version.
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// It must ensure that, after upgrading, the most recent version is present.
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func upgradeDataDir(baseDataDir string, name string, ver version.DataDirVersion) error {
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switch ver {
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case version.DataDir0_4:
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log.Print("etcdserver: converting v0.4 log to v2.0")
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err := migrate.Migrate4To2(baseDataDir, name)
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if err != nil {
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log.Fatalf("etcdserver: failed migrating data-dir: %v", err)
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return err
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}
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fallthrough
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case version.DataDir2_0:
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err := makeMemberDir(baseDataDir)
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if err != nil {
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return err
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}
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fallthrough
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case version.DataDir2_0_1:
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fallthrough
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default:
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log.Printf("etcdserver: datadir is valid for the 2.0.1 format")
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}
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return nil
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}
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func makeMemberDir(dir string) error {
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membdir := path.Join(dir, "member")
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_, err := os.Stat(membdir)
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switch {
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case err == nil:
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return nil
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case !os.IsNotExist(err):
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return err
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}
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if err := os.MkdirAll(membdir, 0700); err != nil {
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return err
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}
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names := []string{"snap", "wal"}
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for _, name := range names {
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if err := os.Rename(path.Join(dir, name), path.Join(membdir, name)); err != nil {
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return err
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}
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}
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return nil
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}
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