mirror of https://gitee.com/IrisVega/frp.git
148 lines
3.3 KiB
Go
148 lines
3.3 KiB
Go
// Copyright 2018 fatedier, fatedier@gmail.com
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package client
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import (
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"context"
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"net"
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"net/http"
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"time"
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)
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type HealthCheckMonitor struct {
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checkType string
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interval time.Duration
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timeout time.Duration
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maxFailedTimes int
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// For tcp
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addr string
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// For http
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url string
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failedTimes uint64
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statusOK bool
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statusNormalFn func()
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statusFailedFn func()
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ctx context.Context
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cancel context.CancelFunc
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}
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func NewHealthCheckMonitor(checkType string, intervalS int, timeoutS int, maxFailedTimes int, addr string, url string,
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statusNormalFn func(), statusFailedFn func()) *HealthCheckMonitor {
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if intervalS <= 0 {
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intervalS = 10
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}
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if timeoutS <= 0 {
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timeoutS = 3
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}
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if maxFailedTimes <= 0 {
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maxFailedTimes = 1
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}
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ctx, cancel := context.WithCancel(context.Background())
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return &HealthCheckMonitor{
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checkType: checkType,
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interval: time.Duration(intervalS) * time.Second,
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timeout: time.Duration(timeoutS) * time.Second,
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maxFailedTimes: maxFailedTimes,
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addr: addr,
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url: url,
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statusOK: false,
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statusNormalFn: statusNormalFn,
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statusFailedFn: statusFailedFn,
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ctx: ctx,
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cancel: cancel,
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}
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}
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func (monitor *HealthCheckMonitor) Start() {
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go monitor.checkWorker()
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}
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func (monitor *HealthCheckMonitor) Stop() {
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monitor.cancel()
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}
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func (monitor *HealthCheckMonitor) checkWorker() {
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for {
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ctx, cancel := context.WithDeadline(monitor.ctx, time.Now().Add(monitor.timeout))
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ok := monitor.doCheck(ctx)
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// check if this monitor has been closed
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select {
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case <-ctx.Done():
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cancel()
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return
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default:
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cancel()
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}
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if ok {
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if !monitor.statusOK && monitor.statusNormalFn != nil {
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monitor.statusOK = true
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monitor.statusNormalFn()
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}
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} else {
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monitor.failedTimes++
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if monitor.statusOK && int(monitor.failedTimes) >= monitor.maxFailedTimes && monitor.statusFailedFn != nil {
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monitor.statusOK = false
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monitor.statusFailedFn()
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}
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}
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time.Sleep(monitor.interval)
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}
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}
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func (monitor *HealthCheckMonitor) doCheck(ctx context.Context) bool {
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switch monitor.checkType {
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case "tcp":
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return monitor.doTcpCheck(ctx)
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case "http":
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return monitor.doHttpCheck(ctx)
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default:
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return false
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}
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}
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func (monitor *HealthCheckMonitor) doTcpCheck(ctx context.Context) bool {
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var d net.Dialer
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conn, err := d.DialContext(ctx, "tcp", monitor.addr)
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if err != nil {
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return false
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}
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conn.Close()
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return true
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}
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func (monitor *HealthCheckMonitor) doHttpCheck(ctx context.Context) bool {
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req, err := http.NewRequest("GET", monitor.url, nil)
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if err != nil {
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return false
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}
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resp, err := http.DefaultClient.Do(req)
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if err != nil {
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return false
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}
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if resp.StatusCode/100 != 2 {
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return false
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}
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return true
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}
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