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https://github.com/etcd-io/etcd.git
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f6cd4d4f5b
Computing the snapshot file path is error prone; snapshot recovery was constructing file paths missing a path separator so the snapshot would never be loaded. Instead, refactor the backend path handling to use helper functions where possible.
78 lines
1.9 KiB
Go
78 lines
1.9 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 snap
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import (
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"errors"
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"fmt"
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"io"
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"io/ioutil"
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"os"
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"path/filepath"
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"github.com/coreos/etcd/pkg/fileutil"
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)
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var ErrNoDBSnapshot = errors.New("snap: snapshot file doesn't exist")
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// SaveDBFrom saves snapshot of the database from the given reader. It
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// guarantees the save operation is atomic.
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func (s *Snapshotter) SaveDBFrom(r io.Reader, id uint64) (int64, error) {
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f, err := ioutil.TempFile(s.dir, "tmp")
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if err != nil {
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return 0, err
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}
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var n int64
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n, err = io.Copy(f, r)
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if err == nil {
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err = fileutil.Fsync(f)
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}
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f.Close()
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if err != nil {
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os.Remove(f.Name())
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return n, err
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}
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fn := s.dbFilePath(id)
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if fileutil.Exist(fn) {
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os.Remove(f.Name())
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return n, nil
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}
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err = os.Rename(f.Name(), fn)
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if err != nil {
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os.Remove(f.Name())
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return n, err
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}
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plog.Infof("saved database snapshot to disk [total bytes: %d]", n)
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return n, nil
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}
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// DBFilePath returns the file path for the snapshot of the database with
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// given id. If the snapshot does not exist, it returns error.
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func (s *Snapshotter) DBFilePath(id uint64) (string, error) {
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if _, err := fileutil.ReadDir(s.dir); err != nil {
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return "", err
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}
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if fn := s.dbFilePath(id); fileutil.Exist(fn) {
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return fn, nil
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}
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return "", ErrNoDBSnapshot
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}
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func (s *Snapshotter) dbFilePath(id uint64) string {
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return filepath.Join(s.dir, fmt.Sprintf("%016x.snap.db", id))
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}
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