package consul

import (
	"fmt"
	"github.com/hashicorp/consul/api"
	"hilo-user/_const"
	"hilo-user/mylogrus"
	"net/http"
	"os"
	"time"
)

const (
	RegisterName = "hiloUser"
	RegisterTag  = "用户中心"
)

// 异步注册到consul
func RegisterToConsul(port int) {
	go register(port, false)
	go selfCheck(port)
}

func consulCheck(w http.ResponseWriter, r *http.Request) {
	_, _ = fmt.Fprintln(w, "consulCheck")
}

func register(port int, retry bool) {
	client, err := api.NewClient(api.DefaultConfig()) //非默认情况下需要设置实际的参数
	if err != nil {
		mylogrus.MyLog.Errorf("RegisterToConsul Fail:%v", err)
		return
	}
	if client == nil {
		mylogrus.MyLog.Errorf("Fail to get consul client.")
		return
	}
	mylogrus.MyLog.Infof("RegisterToConsul:%v-%v", client, err)
	checkPort := port + 1000
	registration := new(api.AgentServiceRegistration)
	hostName, _ := os.Hostname()
	registration.ID = fmt.Sprintf("%s-%s", RegisterName, hostName)
	registration.Name = RegisterName
	registration.Port = port
	registration.Tags = []string{RegisterTag}

	myIp, myNodeName := "", ""
	if localIp, err := _const.GetClientIp(); err != nil {
		mylogrus.MyLog.Fatalln("local ip not found", err)
	} else {
		myIp = localIp
	}
	mylogrus.MyLog.Infof("My ip is %s, nodeName: %s\n", myIp, myNodeName)

	registration.Address = myIp
	registration.Check = &api.AgentServiceCheck{
		HTTP:                           fmt.Sprintf("http://localhost:%d%s", checkPort, "/check"),
		Timeout:                        "3s",
		Interval:                       "5s",
		DeregisterCriticalServiceAfter: "30s", //check失败后30秒删除本服务
	}
	err = client.Agent().ServiceRegister(registration)
	if err != nil {
		mylogrus.MyLog.Errorf("register server error :%v ", err)
		return
	}
	if !retry {
		http.HandleFunc("/check", consulCheck)
		if err = http.ListenAndServe(fmt.Sprintf(":%d", checkPort), nil); err != nil {
			mylogrus.MyLog.Warnf("check server error :%v ", err)
			return
		}
	}
}

// 自愈检查
// 启动后每一分钟检查一次
// 首次启动不执行
func selfCheck(port int) {
	ticker := time.NewTicker(time.Minute)
	defer ticker.Stop()
	for {
		select {
		case <-ticker.C:
			client, err := api.NewClient(api.DefaultConfig()) //非默认情况下需要设置实际的参数
			if err != nil {
				mylogrus.MyLog.Errorf("RegisterToConsul Fail:%v", err)
				break
			}
			if client == nil {
				mylogrus.MyLog.Errorf("Fail to get consul client.")
				break
			}
			cataLog := client.Catalog()
			if cataLog == nil {
				mylogrus.MyLog.Errorf("No catalog.")
				break
			}
			services, _, err := cataLog.Service(RegisterName, "", nil)
			if err != nil {
				mylogrus.MyLog.Errorf("%v", err)
				break
			}
			if len(services) == 0 {
				mylogrus.MyLog.Errorf("%s not found.", RegisterName)
				go register(port, true) // 重新注册
			} else {
				mylogrus.MyLog.Infof("%s check success %v", RegisterName, services[0])
			}
		}
	}
}