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http.go
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http.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-runtime/bcs-mesos/bcs-container-executor/logs"
"net/http"
"strconv"
"time"
"golang.org/x/net/context"
)
// NewHTTPChecker create http checker
func NewHTTPChecker(container, schema string, port int, path string, mechanism *TimeMechanism,
notify FailureNotify) (Checker, error) {
if port <= 1 {
return nil, fmt.Errorf("http checker port is invalid")
}
if mechanism.IntervalSeconds <= mechanism.TimeoutSeconds {
return nil, fmt.Errorf("Interval Seconds must larger than Timeout Seconds")
}
cxt, cancel := context.WithCancel(context.Background())
checker := &HTTPChecker{
CheckerStat: CheckerStat{
Failures: 0,
Ticks: 0,
ConsecutiveFailures: 0,
Healthy: true,
},
container: container,
schema: schema,
port: port,
path: path,
isPause: false,
cxt: cxt,
canceler: cancel,
mechanism: mechanism,
notify: notify,
}
// default schema
if len(schema) == 0 {
checker.schema = "http"
}
return checker, nil
}
// HTTPChecker check for http protocol health check
type HTTPChecker struct {
CheckerStat
container string // container id
schema string // http or https
ipaddr string // ip address to check
port int // port to check
path string // path for http request
isPause bool // pause checker
cxt context.Context // context to control exit
canceler context.CancelFunc // canceler
mechanism *TimeMechanism // time config for checker
notify FailureNotify // failure callback
}
// IsStarting xxx
func (check *HTTPChecker) IsStarting() bool {
return check.Started
}
// SetHost setting host / ipaddress
func (check *HTTPChecker) SetHost(host string) {
check.ipaddr = host
}
// Start start checker
func (check *HTTPChecker) 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("HTTPChecker %s://%s:%d%s ask to exit", check.schema, check.ipaddr, check.port, check.path)
return
case check.LastCheck = <-tick.C:
if check.isPause {
continue
}
check.check()
}
}
}
func (check *HTTPChecker) 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("HTTPChecker %s://%s:%d%s become **Unhealthy**", check.schema, check.ipaddr, check.port, check.path)
if check.notify != nil {
check.notify(check)
}
} else {
check.Healthy = true
check.ConsecutiveFailures = 0
}
}
// Stop stop checker
func (check *HTTPChecker) Stop() {
check.canceler()
}
// ReCheck ask checker to check
func (check *HTTPChecker) ReCheck() bool {
client := &http.Client{
Timeout: time.Second * time.Duration(int64(check.mechanism.TimeoutSeconds)),
}
dest := check.schema + "://" + check.ipaddr + ":" + strconv.Itoa(check.port) + check.path
response, err := client.Get(dest)
if err != nil {
return false
}
defer response.Body.Close()
if response.StatusCode >= 200 && response.StatusCode < 400 {
return true
}
return false
}
// Pause pause check
func (check *HTTPChecker) Pause() error {
check.isPause = true
return nil
}
// Resume arouse checker
func (check *HTTPChecker) Resume() error {
check.isPause = false
return nil
}
// Name get check name
func (check *HTTPChecker) Name() string {
return HttpHealthcheck
}
// Relation checker relative to container
func (check *HTTPChecker) Relation() string {
return check.container
}