chore(server): use httpserver package for control server

internal/server/server.go

@@ -3,11 +3,10 @@ package server
 
 import (
 	"context"
-	"errors"
-	"net/http"
-	"time"
+	"fmt"
 
 	"github.com/qdm12/gluetun/internal/dns"
+	"github.com/qdm12/gluetun/internal/httpserver"
 	"github.com/qdm12/gluetun/internal/models"
 	"github.com/qdm12/gluetun/internal/portforward"
 	"github.com/qdm12/gluetun/internal/publicip"
@@ -15,44 +14,23 @@ import (
 	"github.com/qdm12/gluetun/internal/vpn"
 )
 
-type Server interface {
-	Run(ctx context.Context, done chan<- struct{})
-}
-
-type server struct {
-	address string
-	logger  infoErrorer
-	handler http.Handler
-}
-
 func New(ctx context.Context, address string, logEnabled bool, logger Logger,
 	buildInfo models.BuildInformation, openvpnLooper vpn.Looper,
 	pfGetter portforward.Getter, unboundLooper dns.Looper,
-	updaterLooper updater.Looper, publicIPLooper publicip.Looper) Server {
+	updaterLooper updater.Looper, publicIPLooper publicip.Looper) (server httpserver.Runner, err error) {
 	handler := newHandler(ctx, logger, logEnabled, buildInfo,
 		openvpnLooper, pfGetter, unboundLooper, updaterLooper, publicIPLooper)
-	return &server{
-		address: address,
-		logger:  logger,
-		handler: handler,
-	}
-}
 
-func (s *server) Run(ctx context.Context, done chan<- struct{}) {
-	defer close(done)
-	server := http.Server{Addr: s.address, Handler: s.handler}
-	go func() {
-		<-ctx.Done()
-		const shutdownGraceDuration = 2 * time.Second
-		shutdownCtx, cancel := context.WithTimeout(context.Background(), shutdownGraceDuration)
-		defer cancel()
-		if err := server.Shutdown(shutdownCtx); err != nil {
-			s.logger.Error("failed shutting down: " + err.Error())
-		}
-	}()
-	s.logger.Info("listening on " + s.address)
-	err := server.ListenAndServe()
-	if err != nil && errors.Is(ctx.Err(), context.Canceled) {
-		s.logger.Error(err.Error())
+	httpServerSettings := httpserver.Settings{
+		Address: address,
+		Handler: handler,
+		Logger:  logger,
 	}
+
+	server, err = httpserver.New(httpServerSettings)
+	if err != nil {
+		return nil, fmt.Errorf("cannot create server: %w", err)
+	}
+
+	return server, nil
 }