main.go

package main

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

	"github.com/gin-gonic/gin"
)

func main() {
	// Set Gin to release mode when not in development
	if os.Getenv("GIN_MODE") != "debug" {
		gin.SetMode(gin.ReleaseMode)
	}

	port := os.Getenv("PORT")
	if port == "" {
		log.Fatal("$PORT must be set")
	}
	port = ":" + port // Ensure port includes leading :

	router := gin.New()
	router.Use(gin.Recovery())

	// Route to serve home page
	router.Static("/", "./static")

	// Route to handle incoming SMS messages
	router.POST("/sms", HandleSMS)

	srv := &http.Server{
		Addr:    port,
		Handler: router,
	}

	// Start Server in a Goroutine
	go func() {
		log.Printf("Starting server on %s", port)
		if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
			log.Fatalf("listen: %s\n", err)
		}
	}()

	// Wait for interrupt signal to gracefully shut down the server
	quit := make(chan os.Signal, 1)
	signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM)
	<-quit
	log.Println("Shutting down server...")

	// The context is used to inform the server it has 5 seconds to finish
	// the request it is currently handling
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	if err := srv.Shutdown(ctx); err != nil {
		log.Fatal("Server forced to shutdown:", err)
	}

	log.Println("Server exiting")
}