Dependencies for the affinity router and the
affinity routing daemon.
Change-Id: Icda72c3594ef7f8f0bc0c33dc03087a4c25529ca
diff --git a/vendor/github.com/coreos/etcd/clientv3/namespace/watch.go b/vendor/github.com/coreos/etcd/clientv3/namespace/watch.go
new file mode 100644
index 0000000..5a9596d
--- /dev/null
+++ b/vendor/github.com/coreos/etcd/clientv3/namespace/watch.go
@@ -0,0 +1,83 @@
+// Copyright 2017 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 namespace
+
+import (
+ "context"
+ "sync"
+
+ "github.com/coreos/etcd/clientv3"
+)
+
+type watcherPrefix struct {
+ clientv3.Watcher
+ pfx string
+
+ wg sync.WaitGroup
+ stopc chan struct{}
+ stopOnce sync.Once
+}
+
+// NewWatcher wraps a Watcher instance so that all Watch requests
+// are prefixed with a given string and all Watch responses have
+// the prefix removed.
+func NewWatcher(w clientv3.Watcher, prefix string) clientv3.Watcher {
+ return &watcherPrefix{Watcher: w, pfx: prefix, stopc: make(chan struct{})}
+}
+
+func (w *watcherPrefix) Watch(ctx context.Context, key string, opts ...clientv3.OpOption) clientv3.WatchChan {
+ // since OpOption is opaque, determine range for prefixing through an OpGet
+ op := clientv3.OpGet(key, opts...)
+ end := op.RangeBytes()
+ pfxBegin, pfxEnd := prefixInterval(w.pfx, []byte(key), end)
+ if pfxEnd != nil {
+ opts = append(opts, clientv3.WithRange(string(pfxEnd)))
+ }
+
+ wch := w.Watcher.Watch(ctx, string(pfxBegin), opts...)
+
+ // translate watch events from prefixed to unprefixed
+ pfxWch := make(chan clientv3.WatchResponse)
+ w.wg.Add(1)
+ go func() {
+ defer func() {
+ close(pfxWch)
+ w.wg.Done()
+ }()
+ for wr := range wch {
+ for i := range wr.Events {
+ wr.Events[i].Kv.Key = wr.Events[i].Kv.Key[len(w.pfx):]
+ if wr.Events[i].PrevKv != nil {
+ wr.Events[i].PrevKv.Key = wr.Events[i].Kv.Key
+ }
+ }
+ select {
+ case pfxWch <- wr:
+ case <-ctx.Done():
+ return
+ case <-w.stopc:
+ return
+ }
+ }
+ }()
+ return pfxWch
+}
+
+func (w *watcherPrefix) Close() error {
+ err := w.Watcher.Close()
+ w.stopOnce.Do(func() { close(w.stopc) })
+ w.wg.Wait()
+ return err
+}