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7ec9ff62b5
etcd_snap_db_fsync_duration_seconds_count etcd_snap_db_save_total_duration_seconds_bucket Signed-off-by: Gyuho Lee <leegyuho@amazon.com>
84 lines
2.1 KiB
Go
84 lines
2.1 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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"time"
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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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start := time.Now()
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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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fsyncStart := time.Now()
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err = fileutil.Fsync(f)
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snapDBFsyncSec.Observe(time.Since(fsyncStart).Seconds())
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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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snapDBSaveSec.Observe(time.Since(start).Seconds())
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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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