[VOL-4291] Rw-core updates for gRPC migration
Change-Id: I8d5a554409115b29318089671ca4e1ab3fa98810
diff --git a/vendor/github.com/coreos/etcd/wal/file_pipeline.go b/vendor/github.com/coreos/etcd/wal/file_pipeline.go
new file mode 100644
index 0000000..3a1c57c
--- /dev/null
+++ b/vendor/github.com/coreos/etcd/wal/file_pipeline.go
@@ -0,0 +1,97 @@
+// Copyright 2016 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 wal
+
+import (
+ "fmt"
+ "os"
+ "path/filepath"
+
+ "github.com/coreos/etcd/pkg/fileutil"
+)
+
+// filePipeline pipelines allocating disk space
+type filePipeline struct {
+ // dir to put files
+ dir string
+ // size of files to make, in bytes
+ size int64
+ // count number of files generated
+ count int
+
+ filec chan *fileutil.LockedFile
+ errc chan error
+ donec chan struct{}
+}
+
+func newFilePipeline(dir string, fileSize int64) *filePipeline {
+ fp := &filePipeline{
+ dir: dir,
+ size: fileSize,
+ filec: make(chan *fileutil.LockedFile),
+ errc: make(chan error, 1),
+ donec: make(chan struct{}),
+ }
+ go fp.run()
+ return fp
+}
+
+// Open returns a fresh file for writing. Rename the file before calling
+// Open again or there will be file collisions.
+func (fp *filePipeline) Open() (f *fileutil.LockedFile, err error) {
+ select {
+ case f = <-fp.filec:
+ case err = <-fp.errc:
+ }
+ return f, err
+}
+
+func (fp *filePipeline) Close() error {
+ close(fp.donec)
+ return <-fp.errc
+}
+
+func (fp *filePipeline) alloc() (f *fileutil.LockedFile, err error) {
+ // count % 2 so this file isn't the same as the one last published
+ fpath := filepath.Join(fp.dir, fmt.Sprintf("%d.tmp", fp.count%2))
+ if f, err = fileutil.LockFile(fpath, os.O_CREATE|os.O_WRONLY, fileutil.PrivateFileMode); err != nil {
+ return nil, err
+ }
+ if err = fileutil.Preallocate(f.File, fp.size, true); err != nil {
+ plog.Errorf("failed to allocate space when creating new wal file (%v)", err)
+ f.Close()
+ return nil, err
+ }
+ fp.count++
+ return f, nil
+}
+
+func (fp *filePipeline) run() {
+ defer close(fp.errc)
+ for {
+ f, err := fp.alloc()
+ if err != nil {
+ fp.errc <- err
+ return
+ }
+ select {
+ case fp.filec <- f:
+ case <-fp.donec:
+ os.Remove(f.Name())
+ f.Close()
+ return
+ }
+ }
+}