DMAC/cmd/reactor/main.go

package main

import (
	"FRMS/internal/pkg/config"
	"FRMS/internal/pkg/logging"
	"FRMS/internal/pkg/reactor"
	"fmt"
	"os"
	"syscall"

	"os/signal"

	"github.com/spf13/viper"
)

type reactorCoordinator interface {
	Start()
}

func NewReactorCoordinator(config *viper.Viper, ch chan error) reactorCoordinator {
	// allows interface checking as opposed to calling directly
	return reactor.NewCoordinator(config, ch)
}

func NewConfig(fname string) *viper.Viper {
	return config.LoadConfig(fname)
}

func main() {

	// shutdown
	gracefulShutdown := make(chan os.Signal, 1)
	signal.Notify(gracefulShutdown, syscall.SIGINT, syscall.SIGTERM)

	// load any stored configs
	conf := NewConfig("reactor")

	ch := make(chan error)
	rlc := NewReactorCoordinator(conf, ch) // passing conf and err
	go rlc.Start()
	logging.Debug(logging.DStart, "Reactor Started")

	// check for errors
	select {
	case err := <-ch:
		if err != nil {
			conf.WriteConfig() // save changes
			panic(err)
		}
	case <-gracefulShutdown:
		// sigint
		fmt.Printf("\nStoring config to %s\n", conf.ConfigFileUsed())
		if err := conf.WriteConfig(); err != nil {
			panic(err)
		}
		os.Exit(0)
	}
}