105 lines
2.5 KiB
Go
105 lines
2.5 KiB
Go
// Copyright 2015 The etcd Authors
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package snap
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"io"
|
|
"io/ioutil"
|
|
"os"
|
|
"path/filepath"
|
|
"time"
|
|
|
|
"go.etcd.io/etcd/pkg/fileutil"
|
|
|
|
humanize "github.com/dustin/go-humanize"
|
|
"go.uber.org/zap"
|
|
)
|
|
|
|
var ErrNoDBSnapshot = errors.New("snap: snapshot file doesn't exist")
|
|
|
|
// SaveDBFrom saves snapshot of the database from the given reader. It
|
|
// guarantees the save operation is atomic.
|
|
func (s *Snapshotter) SaveDBFrom(r io.Reader, id uint64) (int64, error) {
|
|
start := time.Now()
|
|
|
|
f, err := ioutil.TempFile(s.dir, "tmp")
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
var n int64
|
|
n, err = io.Copy(f, r)
|
|
if err == nil {
|
|
fsyncStart := time.Now()
|
|
err = fileutil.Fsync(f)
|
|
snapDBFsyncSec.Observe(time.Since(fsyncStart).Seconds())
|
|
}
|
|
f.Close()
|
|
if err != nil {
|
|
os.Remove(f.Name())
|
|
return n, err
|
|
}
|
|
fn := s.dbFilePath(id)
|
|
if fileutil.Exist(fn) {
|
|
os.Remove(f.Name())
|
|
return n, nil
|
|
}
|
|
err = os.Rename(f.Name(), fn)
|
|
if err != nil {
|
|
os.Remove(f.Name())
|
|
return n, err
|
|
}
|
|
|
|
if s.lg != nil {
|
|
s.lg.Info(
|
|
"saved database snapshot to disk",
|
|
zap.String("path", fn),
|
|
zap.Int64("bytes", n),
|
|
zap.String("size", humanize.Bytes(uint64(n))),
|
|
)
|
|
} else {
|
|
plog.Infof("saved database snapshot to disk [total bytes: %d]", n)
|
|
}
|
|
|
|
snapDBSaveSec.Observe(time.Since(start).Seconds())
|
|
return n, nil
|
|
}
|
|
|
|
// DBFilePath returns the file path for the snapshot of the database with
|
|
// given id. If the snapshot does not exist, it returns error.
|
|
func (s *Snapshotter) DBFilePath(id uint64) (string, error) {
|
|
if _, err := fileutil.ReadDir(s.dir); err != nil {
|
|
return "", err
|
|
}
|
|
fn := s.dbFilePath(id)
|
|
if fileutil.Exist(fn) {
|
|
return fn, nil
|
|
}
|
|
if s.lg != nil {
|
|
s.lg.Warn(
|
|
"failed to find [SNAPSHOT-INDEX].snap.db",
|
|
zap.Uint64("snapshot-index", id),
|
|
zap.String("snapshot-file-path", fn),
|
|
zap.Error(ErrNoDBSnapshot),
|
|
)
|
|
}
|
|
return "", ErrNoDBSnapshot
|
|
}
|
|
|
|
func (s *Snapshotter) dbFilePath(id uint64) string {
|
|
return filepath.Join(s.dir, fmt.Sprintf("%016x.snap.db", id))
|
|
}
|