[VOL-4291] Rw-core updates for gRPC migration
Change-Id: I8d5a554409115b29318089671ca4e1ab3fa98810
diff --git a/vendor/github.com/coreos/etcd/rafthttp/probing_status.go b/vendor/github.com/coreos/etcd/rafthttp/probing_status.go
new file mode 100644
index 0000000..109a0ae
--- /dev/null
+++ b/vendor/github.com/coreos/etcd/rafthttp/probing_status.go
@@ -0,0 +1,76 @@
+// 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 (
+ "time"
+
+ "github.com/prometheus/client_golang/prometheus"
+ "github.com/xiang90/probing"
+)
+
+var (
+ // proberInterval must be shorter than read timeout.
+ // Or the connection will time-out.
+ proberInterval = ConnReadTimeout - time.Second
+ statusMonitoringInterval = 30 * time.Second
+ statusErrorInterval = 5 * time.Second
+)
+
+const (
+ // RoundTripperNameRaftMessage is the name of round-tripper that sends
+ // all other Raft messages, other than "snap.Message".
+ RoundTripperNameRaftMessage = "ROUND_TRIPPER_RAFT_MESSAGE"
+ // RoundTripperNameSnapshot is the name of round-tripper that sends merged snapshot message.
+ RoundTripperNameSnapshot = "ROUND_TRIPPER_SNAPSHOT"
+)
+
+func addPeerToProber(p probing.Prober, id string, us []string, roundTripperName string, rttSecProm *prometheus.HistogramVec) {
+ hus := make([]string, len(us))
+ for i := range us {
+ hus[i] = us[i] + ProbingPrefix
+ }
+
+ p.AddHTTP(id, proberInterval, hus)
+
+ s, err := p.Status(id)
+ if err != nil {
+ plog.Errorf("failed to add peer %s into prober", id)
+ } else {
+ go monitorProbingStatus(s, id, roundTripperName, rttSecProm)
+ }
+}
+
+func monitorProbingStatus(s probing.Status, id string, roundTripperName string, rttSecProm *prometheus.HistogramVec) {
+ // set the first interval short to log error early.
+ interval := statusErrorInterval
+ for {
+ select {
+ case <-time.After(interval):
+ if !s.Health() {
+ plog.Warningf("health check for peer %s could not connect: %v (prober %q)", id, s.Err(), roundTripperName)
+ interval = statusErrorInterval
+ } else {
+ interval = statusMonitoringInterval
+ }
+ if s.ClockDiff() > time.Second {
+ plog.Warningf("the clock difference against peer %s is too high [%v > %v] (prober %q)", id, s.ClockDiff(), time.Second, roundTripperName)
+ }
+ rttSecProm.WithLabelValues(id).Observe(s.SRTT().Seconds())
+ case <-s.StopNotify():
+ return
+ }
+ }
+}