package main

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

	"github.com/gofiber/fiber/v2"
)

var exitChannel = make(chan os.Signal, 1)
var shutdownChannel = make(chan struct{}, 1)

func main() {
	app := fiber.New()

	app.Use(fiber2.Middleware())
	app.Get("/", func(c *fiber.Ctx) error {
		client := http.Client{
			Transport: http.DefaultTransport,
		}
		req, err := http.NewRequestWithContext(c.UserContext(), "GET", "http://localhost:8080", nil)
		if err != nil {
			return err
		}
		resp, err := client.Do(req)
		if err != nil {
			return err
		}
		defer resp.Body.Close()
		bytes, err := io.ReadAll(resp.Body)
		if err != nil {
			return err
		}
		return c.Status(fiber.StatusOK).SendString(string(bytes))
	})

	signal.Notify(exitChannel, syscall.SIGINT, syscall.SIGTERM)
	go func() {
		_ = <-exitChannel
		fmt.Println("gracefully shutting down...")
		_ = app.Shutdown()
		close(shutdownChannel)
	}()
	if err := app.Listen(":3000"); err != nil {
		log.Panic(err)
	}

	<-shutdownChannel
	fmt.Println("running cleanup tasks...")
	// teardown
}

package main

import (
	"log"
	"time"

	"github.com/gofiber/fiber/v2"
)

func main() {
	app := fiber.New()

	app.Get("/", func(c *fiber.Ctx) error {
		time.Sleep(5 * time.Second)

		return c.SendString("hello world!")
	})

	log.Fatal(app.Listen(":8080"))
}

// dd-trace-go/contrib/gofiber/fiber.v2/fiber.go#L61
span, ctx := tracer.StartSpanFromContext(c.Context(), cfg.spanName, opts...)