feat: setup Fiber HTTP server

- graceful shutdown
- logging with zap

cmd/yggdrasil/main.go

@@ -0,0 +1,64 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"os/signal"
+	"syscall"
+	"time"
+
+	fiberzap "github.com/gofiber/contrib/fiberzap/v2"
+	"github.com/gofiber/fiber/v2"
+	"go.uber.org/zap"
+)
+
+var port = 3000
+
+func main() {
+	shutdownCtx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
+	defer stop()
+
+	logger := zap.Must(zap.NewDevelopment())
+	defer logger.Sync()
+	sugared := logger.Sugar()
+
+	config := fiber.Config{
+		DisableStartupMessage: true,
+
+		IdleTimeout:  10 * time.Second,
+		ReadTimeout:  10 * time.Second,
+		WriteTimeout: 10 * time.Second,
+	}
+
+	app := fiber.New(config)
+
+	app.Get("/", func(c *fiber.Ctx) error {
+		return c.SendString("Hello, World!")
+	})
+
+	app.Use(fiberzap.New(fiberzap.Config{
+		Logger: logger,
+	}))
+
+	go func() {
+		err := app.Listen(fmt.Sprintf(":%d", port))
+		if err != nil {
+			panic(err)
+		}
+	}()
+
+	sugared.Infow("Yggdrasil is now running", "port", port)
+
+	<-shutdownCtx.Done()
+	stop()
+
+	sugared.Infoln("Shutting down gracefully...")
+	err := app.ShutdownWithTimeout(10 * time.Second)
+	if err != nil {
+		panic(err)
+	}
+
+	// Cleanup code here
+
+	sugared.Infoln("Yggdrasil shut down gracefully.")
+}