smart-alarm/main.go

// Copyright 2019 github.com. All rights reserved.
// Use of this source code is governed by github.com.

package main

import (
	"context"
	"flag"
	"fmt"
	"log"
	"net"
	"os"
	"os/signal"
	"smart-alarm/pb"
	"smart-alarm/utils"
	"syscall"
	"time"

	"smart-alarm/impl"
	"smart-alarm/parser"

	"github.com/jaryhe/gopkgs/database"
	"github.com/jaryhe/gopkgs/tasker"

	"google.golang.org/grpc"
)

var (
	configFile = flag.String("config", "conf/common.yaml", "config file location")
	version    = flag.Bool("version", false, "print the version")
	GitCommit  = "library-import"
	Version    = "library-import"
)

func showVersion() {
	fmt.Println("Version:  ", Version)
	fmt.Println("GitCommit:", GitCommit)
}

func prepare(filename string) {
	// 加载配置
	err := parser.LoadConfig(filename)
	if err != nil {
		fmt.Printf("get conf failed, err: %+v\n\n", err)
		os.Exit(1)
	}

	// 注册处理函数
	// parser.Register(parser.MysqlHandler, parser.RedisHandler, parser.LoggerHandler)
	parser.Register(parser.LoggerHandler, parser.RedisHandler, parser.MysqlHandler, parser.InfluxdbHandler)
	// 执行注册的处理函数
	parser.Handle()
}

// 加载数据到内存
func LoadData() {
	//utils.InitAlarmContact()
	//utils.InitAlarmRule()
	utils.InitAlarmStatistics()
}

func run() {

	LoadData()
	// 开始监听
	serveAddr := fmt.Sprintf("%s:%d", parser.Conf.Rpc.SmartAlarm.ServiceIp, parser.Conf.Rpc.SmartAlarm.ServicePort)
	log.Printf("Listening and serving TCP on %s\n", serveAddr)
	lis, err := net.Listen("tcp", serveAddr)
	if err != nil {
		os.Exit(1)
	}
	s := grpc.NewServer()
	impl.Register(s)

	go func() {
		if err := s.Serve(lis); err != nil {
			log.Fatalf("HTTP server listen failed. err: %s\n", err.Error())
		}
	}()

	// 建立rpc客户端
	conns := pb.SetupClients()
	for _, conn := range conns {
		defer conn.Close()
	}

	// 优雅关闭服务器
	sigChan := make(chan os.Signal, 1)
	// 捕获信号
	signal.Notify(sigChan, syscall.SIGQUIT, syscall.SIGTERM, syscall.SIGINT, syscall.SIGKILL)
	sigValue := <-sigChan
	log.Printf("Got a signal:%v", sigValue)

	// 让tasker安全退出
	tasker.SignalNotify(sigValue)

	// 不管什么行为，都等待5秒退出
	log.Println("Start to shutdown server...")
	_, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	s.Stop()
	log.Println("Shutdown server finished.")
}

func main() {
	defer func() {
		database.Close()
	}()

	flag.Parse()
	if *version {
		showVersion()
		os.Exit(1)
	}

	prepare(*configFile)

	//go utils.Free()

	run()

	return
}