country-geo-locations/main.go

package main

import (
	"fmt"
	"log"
	"net/http"
	"os"
	"os/signal"
	"syscall"

	api_v1 "git.ar21.de/yolokube/country-geo-locations/api/v1"
	"git.ar21.de/yolokube/country-geo-locations/cfg"
	"git.ar21.de/yolokube/country-geo-locations/pkg/downloader"
	"git.ar21.de/yolokube/country-geo-locations/pkg/geoloc"
	"github.com/go-chi/chi/v5"
	"github.com/go-chi/chi/v5/middleware"
	"github.com/go-chi/render"
)

func main() {
	appSettings := cfg.Parse()
	handleGracefulShutdown()
	if !downloader.FileExists(appSettings.DataFile) {
		downloader.DownloadFile(appSettings.DataFile, appSettings.DataURL)
	}

	fmt.Printf("Import data from file...\r")
	err := geoloc.ImportCSV(appSettings.DataFile)
	if err != nil {
		fmt.Println("Import data from file failed")
		panic(err)
	}
	fmt.Println("Import data from file successful")

	r := chi.NewRouter()
	r.Use(middleware.RequestID)
	r.Use(middleware.Logger)
	r.Use(middleware.Recoverer)
	r.Use(render.SetContentType(render.ContentTypeJSON))

	r.Mount("/api/v1", api_v1.ApiRouter())

	log.Printf("starting server at %s\n", appSettings.ServerAddress)
	http.ListenAndServe(appSettings.ServerAddress, r)
}

func handleGracefulShutdown() {
	var signals = make(chan os.Signal, 1)

	signal.Notify(signals, syscall.SIGTERM)
	signal.Notify(signals, syscall.SIGINT)

	go func() {
		sig := <-signals
		log.Printf("caught signal: %+v", sig)
		os.Exit(0)
	}()
}