func startHistoryServer(internalHistorySChan chan history.Scribe, server *engine.Server, exitChan chan bool) {
	scribeServer, err := history.NewFileScribe(cfg.HistoryDir, cfg.HistorySaveInterval)
	if err != nil {
		utils.Logger.Crit(fmt.Sprintf("<HistoryServer> Could not start, error: %s", err.Error()))
		exitChan <- true
	}
	server.RpcRegisterName("ScribeV1", scribeServer)
	internalHistorySChan <- scribeServer
}

func startUsersServer(internalUserSChan chan engine.UserService, accountDb engine.AccountingStorage, server *engine.Server, exitChan chan bool) {
	userServer, err := engine.NewUserMap(accountDb, cfg.UserServerIndexes)
	if err != nil {
		utils.Logger.Crit(fmt.Sprintf("<UsersService> Could not start, error: %s", err.Error()))
		exitChan <- true
		return
	}
	server.RpcRegisterName("UsersV1", userServer)
	internalUserSChan <- userServer
}

// ToDo: Make sure we are caching before starting this one
func startAliasesServer(internalAliaseSChan chan engine.AliasService, accountDb engine.AccountingStorage, server *engine.Server, exitChan chan bool) {
	aliasesServer := engine.NewAliasHandler(accountDb)
	server.RpcRegisterName("AliasesV1", aliasesServer)
	if err := accountDb.CacheAccountingPrefixes(utils.ALIASES_PREFIX); err != nil {
		utils.Logger.Crit(fmt.Sprintf("<Aliases> Could not start, error: %s", err.Error()))
		exitChan <- true
		return
	}
	internalAliaseSChan <- aliasesServer
}

func startRpc(server *engine.Server, internalRaterChan chan *engine.Responder,
	internalCdrSChan chan *engine.CdrServer,
	internalCdrStatSChan chan engine.StatsInterface,
	internalHistorySChan chan history.Scribe,
	internalPubSubSChan chan engine.PublisherSubscriber,
	internalUserSChan chan engine.UserService,
	internalAliaseSChan chan engine.AliasService) {
	select { // Any of the rpc methods will unlock listening to rpc requests
	case resp := <-internalRaterChan:
		internalRaterChan <- resp
	case cdrs := <-internalCdrSChan:
		internalCdrSChan <- cdrs
	case cdrstats := <-internalCdrStatSChan:
		internalCdrStatSChan <- cdrstats
	case hist := <-internalHistorySChan:
		internalHistorySChan <- hist
	case pubsubs := <-internalPubSubSChan:
		internalPubSubSChan <- pubsubs
	case users := <-internalUserSChan:
		internalUserSChan <- users
	case aliases := <-internalAliaseSChan:
		internalAliaseSChan <- aliases
	}
	go server.ServeJSON(cfg.RPCJSONListen)
	go server.ServeGOB(cfg.RPCGOBListen)
	go server.ServeHTTP(cfg.HTTPListen)
}

func main() {
	flag.Parse()
	if *version {
		fmt.Println("CGRateS " + utils.VERSION)
		return
	}
	if *pidFile != "" {
		writePid()
	}
	if *singlecpu {
		runtime.GOMAXPROCS(1) // Having multiple cpus slows down computing due to CPU management, to be reviewed in future Go releases
	}
	if *cpuprofile != "" {
		f, err := os.Create(*cpuprofile)
		if err != nil {
			log.Fatal(err)
		}
		pprof.StartCPUProfile(f)
		defer pprof.StopCPUProfile()
	}
	cfg, err = config.NewCGRConfigFromFolder(*cfgDir)
	if err != nil {
		utils.Logger.Crit(fmt.Sprintf("Could not parse config: %s exiting!", err))
		return
	}
	config.SetCgrConfig(cfg) // Share the config object
	if *raterEnabled {
		cfg.RaterEnabled = *raterEnabled
	}
	if *schedEnabled {
		cfg.SchedulerEnabled = *schedEnabled
	}
	if *cdrsEnabled {
		cfg.CDRSEnabled = *cdrsEnabled
	}
	var ratingDb engine.RatingStorage
	var accountDb engine.AccountingStorage
	var logDb engine.LogStorage
	var loadDb engine.LoadStorage
	var cdrDb engine.CdrStorage
	if cfg.RaterEnabled || cfg.SchedulerEnabled { // Only connect to dataDb if necessary
		ratingDb, err = engine.ConfigureRatingStorage(cfg.TpDbType, cfg.TpDbHost, cfg.TpDbPort,
			cfg.TpDbName, cfg.TpDbUser, cfg.TpDbPass, cfg.DBDataEncoding)
		if err != nil { // Cannot configure getter database, show stopper
			utils.Logger.Crit(fmt.Sprintf("Could not configure dataDb: %s exiting!", err))
			return
		}
		defer ratingDb.Close()
		engine.SetRatingStorage(ratingDb)
		accountDb, err = engine.ConfigureAccountingStorage(cfg.DataDbType, cfg.DataDbHost, cfg.DataDbPort,
			cfg.DataDbName, cfg.DataDbUser, cfg.DataDbPass, cfg.DBDataEncoding)
		if err != nil { // Cannot configure getter database, show stopper
			utils.Logger.Crit(fmt.Sprintf("Could not configure dataDb: %s exiting!", err))
			return
		}
		defer accountDb.Close()
		engine.SetAccountingStorage(accountDb)
	}
	if cfg.RaterEnabled || cfg.CDRSEnabled || cfg.SchedulerEnabled { // Only connect to storDb if necessary
		logDb, err = engine.ConfigureLogStorage(cfg.StorDBType, cfg.StorDBHost, cfg.StorDBPort,
			cfg.StorDBName, cfg.StorDBUser, cfg.StorDBPass, cfg.DBDataEncoding, cfg.StorDBMaxOpenConns, cfg.StorDBMaxIdleConns)
		if err != nil { // Cannot configure logger database, show stopper
			utils.Logger.Crit(fmt.Sprintf("Could not configure logger database: %s exiting!", err))
			return
		}
		defer logDb.Close()
		engine.SetStorageLogger(logDb)
		// loadDb,cdrDb and logDb are all mapped on the same stordb storage
		loadDb = logDb.(engine.LoadStorage)
		cdrDb = logDb.(engine.CdrStorage)
		engine.SetCdrStorage(cdrDb)
	}

	engine.SetRoundingDecimals(cfg.RoundingDecimals)
	stopHandled := false

	// Rpc/http server
	server := new(engine.Server)

	// Async starts here, will follow cgrates.json start order
	exitChan := make(chan bool)

	// Define internal connections via channels
	internalBalancerChan := make(chan *balancer2go.Balancer, 1)
	internalRaterChan := make(chan *engine.Responder, 1)
	internalSchedulerChan := make(chan *scheduler.Scheduler, 1)
	internalCdrSChan := make(chan *engine.CdrServer, 1)
	internalCdrStatSChan := make(chan engine.StatsInterface, 1)
	internalHistorySChan := make(chan history.Scribe, 1)
	internalPubSubSChan := make(chan engine.PublisherSubscriber, 1)
	internalUserSChan := make(chan engine.UserService, 1)
	internalAliaseSChan := make(chan engine.AliasService, 1)

	// Start balancer service
	if cfg.BalancerEnabled {
		go startBalancer(internalBalancerChan, &stopHandled, exitChan) // Not really needed async here but to cope with uniformity
	}

	// Start rater service
	if cfg.RaterEnabled {
//.........这里部分代码省略.........

func startPubSubServer(internalPubSubSChan chan engine.PublisherSubscriber, accountDb engine.AccountingStorage, server *engine.Server) {
	pubSubServer := engine.NewPubSub(accountDb, cfg.HttpSkipTlsVerify)
	server.RpcRegisterName("PubSubV1", pubSubServer)
	internalPubSubSChan <- pubSubServer
}

func startCdrStats(internalCdrStatSChan chan engine.StatsInterface, ratingDb engine.RatingStorage, accountDb engine.AccountingStorage, server *engine.Server) {
	cdrStats := engine.NewStats(ratingDb, accountDb, cfg.CDRStatsSaveInterval)
	server.RpcRegister(cdrStats)
	server.RpcRegister(&v1.CDRStatsV1{CdrStats: cdrStats}) // Public APIs
	internalCdrStatSChan <- cdrStats
}

func startCDRS(internalCdrSChan chan *engine.CdrServer, logDb engine.LogStorage, cdrDb engine.CdrStorage,
	internalRaterChan chan *engine.Responder, internalPubSubSChan chan engine.PublisherSubscriber,
	internalUserSChan chan engine.UserService, internalAliaseSChan chan engine.AliasService,
	internalCdrStatSChan chan engine.StatsInterface, server *engine.Server, exitChan chan bool) {
	utils.Logger.Info("Starting CGRateS CDRS service.")
	var err error
	var client *rpcclient.RpcClient
	// Rater connection init
	var raterConn engine.Connector
	if cfg.CDRSRater == utils.INTERNAL {
		responder := <-internalRaterChan // Wait for rater to come up before start querying
		raterConn = responder
		internalRaterChan <- responder // Put back the connection since there might be other entities waiting for it
	} else if len(cfg.CDRSRater) != 0 {
		client, err = rpcclient.NewRpcClient("tcp", cfg.CDRSRater, cfg.ConnectAttempts, cfg.Reconnects, utils.GOB)
		if err != nil {
			utils.Logger.Crit(fmt.Sprintf("<CDRS> Could not connect to rater: %s", err.Error()))
			exitChan <- true
			return
		}
		raterConn = &engine.RPCClientConnector{Client: client}
	}
	// Pubsub connection init
	var pubSubConn engine.PublisherSubscriber
	if cfg.CDRSPubSub == utils.INTERNAL {
		pubSubs := <-internalPubSubSChan
		pubSubConn = pubSubs
		internalPubSubSChan <- pubSubs
	} else if len(cfg.CDRSPubSub) != 0 {
		if cfg.CDRSRater == cfg.CDRSPubSub {
			pubSubConn = &engine.ProxyPubSub{Client: client}
		} else {
			client, err = rpcclient.NewRpcClient("tcp", cfg.CDRSPubSub, cfg.ConnectAttempts, cfg.Reconnects, utils.GOB)
			if err != nil {
				utils.Logger.Crit(fmt.Sprintf("<CDRS> Could not connect to pubsub server: %s", err.Error()))
				exitChan <- true
				return
			}
			pubSubConn = &engine.ProxyPubSub{Client: client}
		}
	}
	// Users connection init
	var usersConn engine.UserService
	if cfg.CDRSUsers == utils.INTERNAL {
		userS := <-internalUserSChan
		usersConn = userS
		internalUserSChan <- userS
	} else if len(cfg.CDRSUsers) != 0 {
		if cfg.CDRSRater == cfg.CDRSUsers {
			usersConn = &engine.ProxyUserService{Client: client}
		} else {
			client, err = rpcclient.NewRpcClient("tcp", cfg.CDRSUsers, cfg.ConnectAttempts, cfg.Reconnects, utils.GOB)
			if err != nil {
				utils.Logger.Crit(fmt.Sprintf("<CDRS> Could not connect to users server: %s", err.Error()))
				exitChan <- true
				return
			}
			usersConn = &engine.ProxyUserService{Client: client}
		}
	}
	// Aliases connection init
	var aliasesConn engine.AliasService
	if cfg.CDRSAliases == utils.INTERNAL {
		aliaseS := <-internalAliaseSChan
		aliasesConn = aliaseS
		internalAliaseSChan <- aliaseS
	} else if len(cfg.CDRSAliases) != 0 {
		if cfg.CDRSRater == cfg.CDRSAliases {
			aliasesConn = &engine.ProxyAliasService{Client: client}
		} else {
			client, err = rpcclient.NewRpcClient("tcp", cfg.CDRSAliases, cfg.ConnectAttempts, cfg.Reconnects, utils.GOB)
			if err != nil {
				utils.Logger.Crit(fmt.Sprintf("<CDRS> Could not connect to aliases server: %s", err.Error()))
				exitChan <- true
				return
			}
			aliasesConn = &engine.ProxyAliasService{Client: client}
		}
	}
	// Stats connection init
	var statsConn engine.StatsInterface
	if cfg.CDRSStats == utils.INTERNAL {
		statS := <-internalCdrStatSChan
		statsConn = statS
		internalCdrStatSChan <- statS
	} else if len(cfg.CDRSStats) != 0 {
		if cfg.CDRSRater == cfg.CDRSStats {
			statsConn = &engine.ProxyStats{Client: client}
		} else {
			client, err = rpcclient.NewRpcClient("tcp", cfg.CDRSStats, cfg.ConnectAttempts, cfg.Reconnects, utils.GOB)
			if err != nil {
				utils.Logger.Crit(fmt.Sprintf("<CDRS> Could not connect to stats server: %s", err.Error()))
				exitChan <- true
				return
			}
			statsConn = &engine.ProxyStats{Client: client}
		}
	}

	cdrServer, _ := engine.NewCdrServer(cfg, cdrDb, raterConn, pubSubConn, usersConn, aliasesConn, statsConn)
//.........这里部分代码省略.........

// Starts rater and reports on chan
func startRater(internalRaterChan chan *engine.Responder, internalBalancerChan chan *balancer2go.Balancer, internalSchedulerChan chan *scheduler.Scheduler,
	internalCdrStatSChan chan engine.StatsInterface, internalHistorySChan chan history.Scribe,
	internalPubSubSChan chan engine.PublisherSubscriber, internalUserSChan chan engine.UserService, internalAliaseSChan chan engine.AliasService,
	server *engine.Server,
	ratingDb engine.RatingStorage, accountDb engine.AccountingStorage, loadDb engine.LoadStorage, cdrDb engine.CdrStorage, logDb engine.LogStorage,
	stopHandled *bool, exitChan chan bool) {
	waitTasks := make([]chan struct{}, 0)

	//Cache load
	cacheTaskChan := make(chan struct{})
	waitTasks = append(waitTasks, cacheTaskChan)
	go func() {
		defer close(cacheTaskChan)
		if err := ratingDb.CacheRatingAll(); err != nil {
			utils.Logger.Crit(fmt.Sprintf("Cache rating error: %s", err.Error()))
			exitChan <- true
			return
		}
		if err := accountDb.CacheAccountingPrefixes(); err != nil { // Used to cache load history
			utils.Logger.Crit(fmt.Sprintf("Cache accounting error: %s", err.Error()))
			exitChan <- true
			return
		}

	}()

	// Retrieve scheduler for it's API methods
	var sched *scheduler.Scheduler // Need the scheduler in APIer
	if cfg.SchedulerEnabled {
		schedTaskChan := make(chan struct{})
		waitTasks = append(waitTasks, schedTaskChan)
		go func() {
			defer close(schedTaskChan)
			select {
			case sched = <-internalSchedulerChan:
				internalSchedulerChan <- sched
			case <-time.After(cfg.InternalTtl):
				utils.Logger.Crit("<Rater>: Internal scheduler connection timeout.")
				exitChan <- true
				return
			}

		}()
	}

	// Connection to balancer
	var bal *balancer2go.Balancer
	if cfg.RaterBalancer != "" {
		balTaskChan := make(chan struct{})
		waitTasks = append(waitTasks, balTaskChan)
		go func() {
			defer close(balTaskChan)
			if cfg.RaterBalancer == utils.INTERNAL {
				select {
				case bal = <-internalBalancerChan:
					internalBalancerChan <- bal // Put it back if someone else is interested about
				case <-time.After(cfg.InternalTtl):
					utils.Logger.Crit("<Rater>: Internal balancer connection timeout.")
					exitChan <- true
					return
				}
			} else {
				go registerToBalancer(exitChan)
				go stopRaterSignalHandler(internalCdrStatSChan, exitChan)
				*stopHandled = true
			}
		}()
	}

	// Connection to CDRStats
	var cdrStats engine.StatsInterface
	if cfg.RaterCdrStats != "" {
		cdrstatTaskChan := make(chan struct{})
		waitTasks = append(waitTasks, cdrstatTaskChan)
		go func() {
			defer close(cdrstatTaskChan)
			if cfg.RaterCdrStats == utils.INTERNAL {
				select {
				case cdrStats = <-internalCdrStatSChan:
					internalCdrStatSChan <- cdrStats
				case <-time.After(cfg.InternalTtl):
					utils.Logger.Crit("<Rater>: Internal cdrstats connection timeout.")
					exitChan <- true
					return
				}
			} else if cdrStats, err = engine.NewProxyStats(cfg.RaterCdrStats, cfg.ConnectAttempts, -1); err != nil {
				utils.Logger.Crit(fmt.Sprintf("<Rater> Could not connect to cdrstats, error: %s", err.Error()))
				exitChan <- true
				return
			}
		}()
	}

	// Connection to HistoryS
	if cfg.RaterHistoryServer != "" {
		histTaskChan := make(chan struct{})
		waitTasks = append(waitTasks, histTaskChan)
		go func() {
			defer close(histTaskChan)
//.........这里部分代码省略.........