104 lines
2.7 KiB
Go
104 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 wal
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import (
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"io"
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"os"
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"path"
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"github.com/coreos/etcd/pkg/fileutil"
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"github.com/coreos/etcd/wal/walpb"
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)
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// Repair tries to repair ErrUnexpectedEOF in the
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// last wal file by truncating.
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func Repair(dirpath string) bool {
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f, err := openLast(dirpath)
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if err != nil {
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return false
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}
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defer f.Close()
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rec := &walpb.Record{}
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decoder := newDecoder(f)
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for {
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lastOffset := decoder.lastOffset()
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err := decoder.decode(rec)
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switch err {
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case nil:
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// update crc of the decoder when necessary
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switch rec.Type {
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case crcType:
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crc := decoder.crc.Sum32()
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// current crc of decoder must match the crc of the record.
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// do no need to match 0 crc, since the decoder is a new one at this case.
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if crc != 0 && rec.Validate(crc) != nil {
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return false
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}
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decoder.updateCRC(rec.Crc)
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}
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continue
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case io.EOF:
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return true
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case io.ErrUnexpectedEOF:
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plog.Noticef("repairing %v", f.Name())
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bf, bferr := os.Create(f.Name() + ".broken")
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if bferr != nil {
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plog.Errorf("could not repair %v, failed to create backup file", f.Name())
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return false
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}
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defer bf.Close()
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if _, err = f.Seek(0, os.SEEK_SET); err != nil {
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plog.Errorf("could not repair %v, failed to read file", f.Name())
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return false
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}
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if _, err = io.Copy(bf, f); err != nil {
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plog.Errorf("could not repair %v, failed to copy file", f.Name())
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return false
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}
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if err = f.Truncate(int64(lastOffset)); err != nil {
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plog.Errorf("could not repair %v, failed to truncate file", f.Name())
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return false
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}
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if err = fileutil.Fsync(f.File); err != nil {
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plog.Errorf("could not repair %v, failed to sync file", f.Name())
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return false
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}
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return true
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default:
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plog.Errorf("could not repair error (%v)", err)
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return false
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}
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}
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}
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// openLast opens the last wal file for read and write.
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func openLast(dirpath string) (*fileutil.LockedFile, error) {
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names, err := fileutil.ReadDir(dirpath)
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if err != nil {
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return nil, err
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}
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names = checkWalNames(names)
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if len(names) == 0 {
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return nil, ErrFileNotFound
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}
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last := path.Join(dirpath, names[len(names)-1])
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return fileutil.LockFile(last, os.O_RDWR, 0600)
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}
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