Dependencies for the affinity router and the
affinity routing daemon.
Change-Id: Icda72c3594ef7f8f0bc0c33dc03087a4c25529ca
diff --git a/vendor/github.com/coreos/etcd/proxy/grpcproxy/watcher.go b/vendor/github.com/coreos/etcd/proxy/grpcproxy/watcher.go
new file mode 100644
index 0000000..1a49746
--- /dev/null
+++ b/vendor/github.com/coreos/etcd/proxy/grpcproxy/watcher.go
@@ -0,0 +1,129 @@
+// 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 grpcproxy
+
+import (
+ "time"
+
+ "github.com/coreos/etcd/clientv3"
+ pb "github.com/coreos/etcd/etcdserver/etcdserverpb"
+ "github.com/coreos/etcd/mvcc"
+ "github.com/coreos/etcd/mvcc/mvccpb"
+)
+
+type watchRange struct {
+ key, end string
+}
+
+func (wr *watchRange) valid() bool {
+ return len(wr.end) == 0 || wr.end > wr.key || (wr.end[0] == 0 && len(wr.end) == 1)
+}
+
+type watcher struct {
+ // user configuration
+
+ wr watchRange
+ filters []mvcc.FilterFunc
+ progress bool
+ prevKV bool
+
+ // id is the id returned to the client on its watch stream.
+ id int64
+ // nextrev is the minimum expected next event revision.
+ nextrev int64
+ // lastHeader has the last header sent over the stream.
+ lastHeader pb.ResponseHeader
+
+ // wps is the parent.
+ wps *watchProxyStream
+}
+
+// send filters out repeated events by discarding revisions older
+// than the last one sent over the watch channel.
+func (w *watcher) send(wr clientv3.WatchResponse) {
+ if wr.IsProgressNotify() && !w.progress {
+ return
+ }
+ if w.nextrev > wr.Header.Revision && len(wr.Events) > 0 {
+ return
+ }
+ if w.nextrev == 0 {
+ // current watch; expect updates following this revision
+ w.nextrev = wr.Header.Revision + 1
+ }
+
+ events := make([]*mvccpb.Event, 0, len(wr.Events))
+
+ var lastRev int64
+ for i := range wr.Events {
+ ev := (*mvccpb.Event)(wr.Events[i])
+ if ev.Kv.ModRevision < w.nextrev {
+ continue
+ } else {
+ // We cannot update w.rev here.
+ // txn can have multiple events with the same rev.
+ // If w.nextrev updates here, it would skip events in the same txn.
+ lastRev = ev.Kv.ModRevision
+ }
+
+ filtered := false
+ for _, filter := range w.filters {
+ if filter(*ev) {
+ filtered = true
+ break
+ }
+ }
+ if filtered {
+ continue
+ }
+
+ if !w.prevKV {
+ evCopy := *ev
+ evCopy.PrevKv = nil
+ ev = &evCopy
+ }
+ events = append(events, ev)
+ }
+
+ if lastRev >= w.nextrev {
+ w.nextrev = lastRev + 1
+ }
+
+ // all events are filtered out?
+ if !wr.IsProgressNotify() && !wr.Created && len(events) == 0 && wr.CompactRevision == 0 {
+ return
+ }
+
+ w.lastHeader = wr.Header
+ w.post(&pb.WatchResponse{
+ Header: &wr.Header,
+ Created: wr.Created,
+ CompactRevision: wr.CompactRevision,
+ Canceled: wr.Canceled,
+ WatchId: w.id,
+ Events: events,
+ })
+}
+
+// post puts a watch response on the watcher's proxy stream channel
+func (w *watcher) post(wr *pb.WatchResponse) bool {
+ select {
+ case w.wps.watchCh <- wr:
+ case <-time.After(50 * time.Millisecond):
+ w.wps.cancel()
+ return false
+ }
+ return true
+}