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// 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"
"go.uber.org/zap"
)
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"
)
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
)
func addPeerToProber(lg *zap.Logger, 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 {
if lg != nil {
lg.Warn("failed to add peer into prober", zap.String("remote-peer-id", id), zap.Error(err))
}
return
}
go monitorProbingStatus(lg, s, id, roundTripperName, rttSecProm)
}
func monitorProbingStatus(lg *zap.Logger, 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() {
if lg != nil {
lg.Warn(
"prober detected unhealthy status",
zap.String("round-tripper-name", roundTripperName),
zap.String("remote-peer-id", id),
zap.Duration("rtt", s.SRTT()),
zap.Error(s.Err()),
)
}
interval = statusErrorInterval
} else {
interval = statusMonitoringInterval
}
if s.ClockDiff() > time.Second {
if lg != nil {
lg.Warn(
"prober found high clock drift",
zap.String("round-tripper-name", roundTripperName),
zap.String("remote-peer-id", id),
zap.Duration("clock-drift", s.ClockDiff()),
zap.Duration("rtt", s.SRTT()),
zap.Error(s.Err()),
)
}
}
rttSecProm.WithLabelValues(id).Observe(s.SRTT().Seconds())
case <-s.StopNotify():
return
}
}
}
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