[VOL-4291] Rw-core updates for gRPC migration
Change-Id: I8d5a554409115b29318089671ca4e1ab3fa98810
diff --git a/vendor/github.com/coreos/etcd/snap/db.go b/vendor/github.com/coreos/etcd/snap/db.go
new file mode 100644
index 0000000..dcbd3bd
--- /dev/null
+++ b/vendor/github.com/coreos/etcd/snap/db.go
@@ -0,0 +1,83 @@
+// 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"
+
+ "github.com/coreos/etcd/pkg/fileutil"
+)
+
+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
+ }
+
+ 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
+ }
+ if fn := s.dbFilePath(id); fileutil.Exist(fn) {
+ return fn, nil
+ }
+ return "", ErrNoDBSnapshot
+}
+
+func (s *Snapshotter) dbFilePath(id uint64) string {
+ return filepath.Join(s.dir, fmt.Sprintf("%016x.snap.db", id))
+}