adm-gateway/main.go

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

// @title Project adm-gateway's APIs
// @version 1.1
// @description This is a gateway server. On the page, you can go to do testing for every API.

package main

import (
	"context"
	"flag"
	"fmt"
	"log"
	"net/http"
	"os"
	"os/signal"
	"syscall"
	"time"

	"adm-gateway/etcd"
	"adm-gateway/parser"
	"adm-gateway/pb"
	"adm-gateway/route"

	"github.com/gin-gonic/gin"
	swaggerFiles "github.com/swaggo/files"
	ginSwagger "github.com/swaggo/gin-swagger"
	"git.getensh.com/common/gopkgsv2/database"
	"git.getensh.com/common/gopkgsv2/tasker"
	"gopkg.in/ini.v1"
)

var (
	configFile = flag.String("config", "/etc/adm/common.yaml", "config file location")
	appConf    = flag.String("local_config", "/etc/adm-gateway/app.conf", "app.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.MysqlHandler, parser.LoggerHandler, parser.JwtHandler)
	// 执行注册的处理函数
	parser.Handle()
}

func run(discoveryType, etcdAddr, serviceIp, servicePort string) {
	if discoveryType == "etcd" {
		etcd.Init(etcdAddr)
	}

	// 新建engine
	engine := gin.New()
	handlers := gin.HandlersChain{}

	// 根据env_mode设置gin的运行模式
	switch parser.Conf.RunMode {
	case "test":
		gin.SetMode(gin.TestMode)
	case "prod":
		gin.SetMode(gin.ReleaseMode)
	case "dev":
		fallthrough
	default:
		gin.SetMode(gin.DebugMode)
		// 根据配置是否生成swagger
		engine.GET("/swagger/*any", ginSwagger.WrapHandler(swaggerFiles.Handler))
		// 输出打印日志
		handlers = append(handlers, gin.Logger())
	}

	// 处理panic
	handlers = append(handlers, gin.Recovery())
	engine.Use(handlers...)

	// 设定路由
	route.SetupRoute(engine)

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

	// 创建监听服务
	server := &http.Server{
		Addr:    serviceIp + ":" + servicePort,
		Handler: engine,
	}

	// 开始监听
	fmt.Printf("Listening and serving HTTP on %s\n", server.Addr)
	go func() {
		if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
			log.Fatalf("HTTP server listen failed. err: %s\n", err.Error())
		}
	}()

	// 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...")
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	if err := server.Shutdown(ctx); err != nil {
		log.Printf("Shutdown server failed. err: %s", err.Error())
	}
	log.Println("Shutdown server finished.")
}

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

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

	// 读取app.conf内容
	cfg, err := ini.Load(*appConf)
	if err != nil {
		fmt.Printf("get app.conf failed, err:%+v\n", err)
		os.Exit(1)
	}

	discoveryType := cfg.Section("").Key("discoveryType").String()
	serviceIp := cfg.Section("").Key("serviceIp").String()
	servicePort := cfg.Section("").Key("servicePort").String()
	etcdAddr := cfg.Section("").Key("etcdAddr").String()

	prepare(*configFile)

	// go utils.Free()

	run(discoveryType, etcdAddr, serviceIp, servicePort)

	return
}