refactor: clean up main

pkg/server/server.go

@@ -0,0 +1,54 @@
+package server
+
+import (
+	"context"
+	"net/http"
+	"os"
+	"os/signal"
+	"syscall"
+	"time"
+
+	"github.com/go-chi/chi/v5"
+	log "github.com/sirupsen/logrus"
+
+	"github.com/nais/wonderwall/pkg/config"
+)
+
+func Start(cfg *config.Config, r chi.Router) error {
+	server := http.Server{
+		Addr:    cfg.BindAddress,
+		Handler: r,
+	}
+
+	serverCtx, serverStopCtx := context.WithCancel(context.Background())
+
+	sig := make(chan os.Signal, 1)
+	signal.Notify(sig, syscall.SIGHUP, syscall.SIGINT, syscall.SIGTERM, syscall.SIGQUIT)
+	go func() {
+		<-sig
+
+		shutdownCtx, shutdownStopCtx := context.WithTimeout(serverCtx, 20*time.Second)
+
+		go func() {
+			<-shutdownCtx.Done()
+			if shutdownCtx.Err() == context.DeadlineExceeded {
+				log.Fatal("graceful shutdown timed out.. forcing exit.")
+			}
+		}()
+
+		err := server.Shutdown(shutdownCtx)
+		if err != nil {
+			log.Fatal(err)
+		}
+		shutdownStopCtx()
+		serverStopCtx()
+	}()
+
+	err := server.ListenAndServe()
+	if err != nil && err != http.ErrServerClosed {
+		return err
+	}
+
+	<-serverCtx.Done()
+	return nil
+}