[VOL-4291] Rw-core updates for gRPC migration
Change-Id: I8d5a554409115b29318089671ca4e1ab3fa98810
diff --git a/vendor/github.com/coreos/etcd/rafthttp/urlpick.go b/vendor/github.com/coreos/etcd/rafthttp/urlpick.go
new file mode 100644
index 0000000..61839de
--- /dev/null
+++ b/vendor/github.com/coreos/etcd/rafthttp/urlpick.go
@@ -0,0 +1,57 @@
+// 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 rafthttp
+
+import (
+ "net/url"
+ "sync"
+
+ "github.com/coreos/etcd/pkg/types"
+)
+
+type urlPicker struct {
+ mu sync.Mutex // guards urls and picked
+ urls types.URLs
+ picked int
+}
+
+func newURLPicker(urls types.URLs) *urlPicker {
+ return &urlPicker{
+ urls: urls,
+ }
+}
+
+func (p *urlPicker) update(urls types.URLs) {
+ p.mu.Lock()
+ defer p.mu.Unlock()
+ p.urls = urls
+ p.picked = 0
+}
+
+func (p *urlPicker) pick() url.URL {
+ p.mu.Lock()
+ defer p.mu.Unlock()
+ return p.urls[p.picked]
+}
+
+// unreachable notices the picker that the given url is unreachable,
+// and it should use other possible urls.
+func (p *urlPicker) unreachable(u url.URL) {
+ p.mu.Lock()
+ defer p.mu.Unlock()
+ if u == p.urls[p.picked] {
+ p.picked = (p.picked + 1) % len(p.urls)
+ }
+}