cml04-falcon-system/injector/app/app.go

package app

import (
	"fmt"
	"os"
	"os/signal"
	"syscall"

	"git.espin.casa/albert/cml04-falcon-system/injector/logging"
	"git.espin.casa/albert/cml04-falcon-system/injector/service"
	"git.espin.casa/albert/cml04-falcon-system/internal/publisher"
	"git.espin.casa/albert/logger"
	"github.com/nats-io/nats.go"
	"github.com/spf13/cobra"
)

func Run(cmd *cobra.Command, args []string) {
	// read flags
	logLevel, _ := cmd.Flags().GetString("log-level")
	httpAddr, _ := cmd.Flags().GetString("http-addr")
	natsHost, _ := cmd.Flags().GetString("nats-host")
	natsPort, _ := cmd.Flags().GetInt("nats-port")
	// setup logger
	log := logger.New(os.Stdout, logLevel)
	// log fields
	logFields := logger.LogFields{
		"http-bind": httpAddr,
		"nats_host": natsHost,
		"nats_port": natsPort,
		"log_level": logLevel,
	}
	// NATS connect
	nc, err := nats.Connect(fmt.Sprintf("nats://%s:%d", natsHost, natsPort))
	if err != nil {
		log.Error("create nats connection failed", err, logFields)
		return
	}
	// on close disconnects
	defer nc.Close()
	pub := publisher.New(nc)
	// create service
	svc := service.New(pub)
	svc = logging.New(log, svc)
	// info banner
	log.Info("started cml04-falcon-handset service", logFields)
	// wait signal to finish
	signal := WaitSignal()
	log.Info("signal received", logFields.Add(logger.LogFields{
		"signal": signal,
	}))
}

// WaitSignal catching exit signal
func WaitSignal() os.Signal {
	ch := make(chan os.Signal, 2)
	signal.Notify(
		ch,
		syscall.SIGINT,
		syscall.SIGQUIT,
		syscall.SIGTERM,
	)
	for {
		sig := <-ch
		switch sig {
		case syscall.SIGINT, syscall.SIGQUIT, syscall.SIGTERM:
			return sig
		}
	}
}