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tcp.go
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tcp.go
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/*
* Tencent is pleased to support the open source community by making Blueking Container Service available.
* Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
* Licensed under the MIT License (the "License"); you may not use this file except
* in compliance with the License. You may obtain a copy of the License at
* http://opensource.org/licenses/MIT
* 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 healthcheck
import (
"fmt"
"github.com/Tencent/bk-bcs/bcs-mesos/bcs-container-executor/logs"
"net"
"strconv"
"time"
"golang.org/x/net/context"
)
//NewTCPChecker create TCP checker
func NewTCPChecker(container string, port int, mechanism *TimeMechanism, notify FailureNotify) (Checker, error) {
if mechanism.IntervalSeconds <= mechanism.TimeoutSeconds {
return nil, fmt.Errorf("Interval Seconds must larger than Timeout Seconds")
}
if port < 1 {
return nil, fmt.Errorf("port is invalid")
}
cxt, cancel := context.WithCancel(context.Background())
check := &TCPChecker{
CheckerStat: CheckerStat{
Failures: 0,
Ticks: 0,
ConsecutiveFailures: 0,
Healthy: true,
},
container: container,
port: port,
isPause: false,
cxt: cxt,
canceler: cancel,
mechanism: mechanism,
}
return check, nil
}
//TCPChecker create check for tcp port check
type TCPChecker struct {
CheckerStat
container string //name for container
ipaddr string //ip address to check
port int //port to check
isPause bool //status for pause
cxt context.Context //context to control exit
canceler context.CancelFunc //canceler
mechanism *TimeMechanism //time config for checker
notify FailureNotify //callback when unhealthy
}
func (check *TCPChecker) IsStarting() bool {
return check.Started
}
//SetHost setting host / ipaddress
func (check *TCPChecker) SetHost(host string) {
check.ipaddr = host
}
//Start start checker, must running in indivisual goroutine
func (check *TCPChecker) Start() {
check.Started = true
check.StartPoint = time.Now()
time.Sleep(time.Duration(int64(check.mechanism.GracePeriodSeconds)) * time.Second)
check.check()
tick := time.NewTicker(time.Duration(int64(check.mechanism.IntervalSeconds)) * time.Second)
defer tick.Stop()
for {
select {
case <-check.cxt.Done():
logs.Infof("TCPChecker ###%s:%d### ask to exit", check.ipaddr, check.port)
return
case check.LastCheck = <-tick.C:
if check.isPause {
continue
}
check.check()
}
}
}
func (check *TCPChecker) check() {
check.Ticks++
healthy := check.ReCheck()
/*notGrace := int(check.LastCheck.Unix()-check.StartPoint.Unix()) > check.mechanism.GracePeriodSeconds
if !healthy && notGrace {*/
if !healthy {
check.LastFailure = check.LastCheck
check.ConsecutiveFailures++
check.Healthy = false
logs.Infof("TCPChecker %s:%d become **Unhealthy**", check.ipaddr, check.port)
if check.notify != nil {
check.notify(check)
}
} else {
check.Healthy = true
check.ConsecutiveFailures = 0
}
}
//Stop stop checker
func (check *TCPChecker) Stop() {
check.canceler()
}
//ReCheck ask checker to check
func (check *TCPChecker) ReCheck() bool {
dest := check.ipaddr + ":" + strconv.Itoa(check.port)
con, err := net.DialTimeout("tcp", dest, time.Duration(int64(check.mechanism.TimeoutSeconds))*time.Second)
if err != nil {
return false
}
defer con.Close()
return true
}
//Pause pause check
func (check *TCPChecker) Pause() error {
check.isPause = true
return nil
}
//Resume arouse checker
func (check *TCPChecker) Resume() error {
check.isPause = false
return nil
}
//Name get check name
func (check *TCPChecker) Name() string {
return TcpHealthcheck
}
//Relation checker relative to container
func (check *TCPChecker) Relation() string {
return check.container
}