71 lines
1.7 KiB
Go
71 lines
1.7 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 snap
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import (
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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"
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"github.com/coreos/etcd/pkg/fileutil"
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)
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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) error {
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f, err := ioutil.TempFile(s.dir, "tmp")
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if err != nil {
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return err
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}
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_, err = io.Copy(f, r)
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if err == nil {
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err = f.Sync()
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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 err
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}
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fn := path.Join(s.dir, fmt.Sprintf("%016x.snap.db", id))
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if fileutil.Exist(fn) {
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os.Remove(f.Name())
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return 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 err
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}
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return 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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fns, err := fileutil.ReadDir(s.dir)
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if err != nil {
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return "", err
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}
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wfn := fmt.Sprintf("%016x.snap.db", id)
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for _, fn := range fns {
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if fn == wfn {
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return path.Join(s.dir, fn), nil
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}
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}
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return "", fmt.Errorf("snap: snapshot file doesn't exist")
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}
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