refactor(server): setup TLS listeners manually to remove `ServeTLS` use

server/server.go

@@ -50,7 +50,6 @@ type Server struct {
 	queryResolver  resolver.ChainedResolver
 	cfg            *config.Config
 	httpMux        *chi.Mux
-	tlsCfg         *tls.Config
 }
 
 func logger() *logrus.Entry {
@@ -117,8 +116,6 @@ func newTLSConfig(cfg *config.Config) (*tls.Config, error) {
 }
 
 // NewServer creates new server instance with passed config
-//
-//nolint:funlen
 func NewServer(ctx context.Context, cfg *config.Config) (server *Server, err error) {
 	var tlsCfg *tls.Config
 
@@ -134,7 +131,7 @@ func NewServer(ctx context.Context, cfg *config.Config) (server *Server, err err
 		return nil, fmt.Errorf("server creation failed: %w", err)
 	}
 
-	httpListeners, httpsListeners, err := createHTTPListeners(cfg)
+	httpListeners, httpsListeners, err := createHTTPListeners(cfg, tlsCfg)
 	if err != nil {
 		return nil, err
 	}
@@ -165,7 +162,6 @@ func NewServer(ctx context.Context, cfg *config.Config) (server *Server, err err
 		cfg:            cfg,
 		httpListeners:  httpListeners,
 		httpsListeners: httpsListeners,
-		tlsCfg:         tlsCfg,
 	}
 
 	server.printConfiguration()
@@ -211,13 +207,15 @@ func createServers(cfg *config.Config, tlsCfg *tls.Config) ([]*dns.Server, error
 	return dnsServers, err.ErrorOrNil()
 }
 
-func createHTTPListeners(cfg *config.Config) (httpListeners, httpsListeners []net.Listener, err error) {
+func createHTTPListeners(
-	httpListeners, err = newListeners("http", cfg.Ports.HTTP)
+	cfg *config.Config, tlsCfg *tls.Config,
+) (httpListeners, httpsListeners []net.Listener, err error) {
+	httpListeners, err = newTCPListeners("http", cfg.Ports.HTTP)
 	if err != nil {
 		return nil, nil, err
 	}
 
-	httpsListeners, err = newListeners("https", cfg.Ports.HTTPS)
+	httpsListeners, err = newTLSListeners("https", cfg.Ports.HTTPS, tlsCfg)
 	if err != nil {
 		return nil, nil, err
 	}
@@ -225,7 +223,7 @@ func createHTTPListeners(cfg *config.Config) (httpListeners, httpsListeners []ne
 	return httpListeners, httpsListeners, nil
 }
 
-func newListeners(proto string, addresses config.ListenConfig) ([]net.Listener, error) {
+func newTCPListeners(proto string, addresses config.ListenConfig) ([]net.Listener, error) {
 	listeners := make([]net.Listener, 0, len(addresses))
 
 	for _, address := range addresses {
@@ -240,6 +238,19 @@ func newListeners(proto string, addresses config.ListenConfig) ([]net.Listener,
 	return listeners, nil
 }
 
+func newTLSListeners(proto string, addresses config.ListenConfig, tlsCfg *tls.Config) ([]net.Listener, error) {
+	listeners, err := newTCPListeners(proto, addresses)
+	if err != nil {
+		return nil, err
+	}
+
+	for i, inner := range listeners {
+		listeners[i] = tls.NewListener(inner, tlsCfg)
+	}
+
+	return listeners, nil
+}
+
 func createTLSServer(address string, tlsCfg *tls.Config) (*dns.Server, error) {
 	return &dns.Server{
 		Addr:      address,
@@ -521,10 +532,9 @@ func (s *Server) Start(ctx context.Context, errCh chan<- error) {
 				ReadTimeout:       readTimeout,
 				ReadHeaderTimeout: readHeaderTimeout,
 				WriteTimeout:      writeTimeout,
-				TLSConfig:         s.tlsCfg,
 			}
 
-			if err := server.ServeTLS(listener, "", ""); err != nil {
+			if err := server.Serve(listener); err != nil {
 				errCh <- fmt.Errorf("start https listener failed: %w", err)
 			}
 		}()

server/server_test.go

@@ -4,7 +4,6 @@ import (
 	"bytes"
 	"context"
 	"encoding/base64"
-	"fmt"
 	"io"
 	"net"
 	"net/http"
@@ -741,11 +740,12 @@ var _ = Describe("Running DNS server", func() {
 			cfg.KeyFile = ""
 			cfg.CertFile = ""
 			cfg.Ports = config.Ports{
-				HTTPS: []string{fmt.Sprintf(":%d", GetIntPort(httpsBasePort)+100)},
+				HTTPS: []string{":0"},
 			}
-			sut, err := NewServer(ctx, &cfg)
+
+			sut, err := newTLSConfig(&cfg)
 			Expect(err).Should(Succeed())
-			Expect(sut.tlsCfg.Certificates).ShouldNot(BeEmpty())
+			Expect(sut.Certificates).ShouldNot(BeEmpty())
 		})
 	})
 })