This update provides:
1) workaround around the build failures. In
summary, it forces the download of some packages during the build
process.
2) update the set of packages that should go inside the vendor
directory
3) Update the dockerfile to use go 1.10
Change-Id: I2bfd090ce0f25b0c10aa214755ae2da7e5384d60
diff --git a/vendor/github.com/coreos/etcd/proxy/grpcproxy/leader.go b/vendor/github.com/coreos/etcd/proxy/grpcproxy/leader.go
new file mode 100644
index 0000000..042c949
--- /dev/null
+++ b/vendor/github.com/coreos/etcd/proxy/grpcproxy/leader.go
@@ -0,0 +1,115 @@
+// 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 grpcproxy
+
+import (
+ "context"
+ "math"
+ "sync"
+
+ "github.com/coreos/etcd/clientv3"
+ "github.com/coreos/etcd/etcdserver/api/v3rpc/rpctypes"
+
+ "golang.org/x/time/rate"
+ "google.golang.org/grpc"
+)
+
+const (
+ lostLeaderKey = "__lostleader" // watched to detect leader loss
+ retryPerSecond = 10
+)
+
+type leader struct {
+ ctx context.Context
+ w clientv3.Watcher
+ // mu protects leaderc updates.
+ mu sync.RWMutex
+ leaderc chan struct{}
+ disconnc chan struct{}
+ donec chan struct{}
+}
+
+func newLeader(ctx context.Context, w clientv3.Watcher) *leader {
+ l := &leader{
+ ctx: clientv3.WithRequireLeader(ctx),
+ w: w,
+ leaderc: make(chan struct{}),
+ disconnc: make(chan struct{}),
+ donec: make(chan struct{}),
+ }
+ // begin assuming leader is lost
+ close(l.leaderc)
+ go l.recvLoop()
+ return l
+}
+
+func (l *leader) recvLoop() {
+ defer close(l.donec)
+
+ limiter := rate.NewLimiter(rate.Limit(retryPerSecond), retryPerSecond)
+ rev := int64(math.MaxInt64 - 2)
+ for limiter.Wait(l.ctx) == nil {
+ wch := l.w.Watch(l.ctx, lostLeaderKey, clientv3.WithRev(rev), clientv3.WithCreatedNotify())
+ cresp, ok := <-wch
+ if !ok {
+ l.loseLeader()
+ continue
+ }
+ if cresp.Err() != nil {
+ l.loseLeader()
+ if rpctypes.ErrorDesc(cresp.Err()) == grpc.ErrClientConnClosing.Error() {
+ close(l.disconnc)
+ return
+ }
+ continue
+ }
+ l.gotLeader()
+ <-wch
+ l.loseLeader()
+ }
+}
+
+func (l *leader) loseLeader() {
+ l.mu.RLock()
+ defer l.mu.RUnlock()
+ select {
+ case <-l.leaderc:
+ default:
+ close(l.leaderc)
+ }
+}
+
+// gotLeader will force update the leadership status to having a leader.
+func (l *leader) gotLeader() {
+ l.mu.Lock()
+ defer l.mu.Unlock()
+ select {
+ case <-l.leaderc:
+ l.leaderc = make(chan struct{})
+ default:
+ }
+}
+
+func (l *leader) disconnectNotify() <-chan struct{} { return l.disconnc }
+
+func (l *leader) stopNotify() <-chan struct{} { return l.donec }
+
+// lostNotify returns a channel that is closed if there has been
+// a leader loss not yet followed by a leader reacquire.
+func (l *leader) lostNotify() <-chan struct{} {
+ l.mu.RLock()
+ defer l.mu.RUnlock()
+ return l.leaderc
+}