Update git.autistici.org/ai3/go-common digest to b3aa3fb

This MR contains the following updates:

Package	Type	Update	Change
git.autistici.org/ai3/go-common	require	digest	0630401 -> b3aa3fb

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vendor/git.autistici.org/ai3/go-common/serverutil/http.go

@@ -104,20 +104,13 @@ func (config *ServerConfig) buildHTTPHandler(h http.Handler) (http.Handler, *tls
 	return h, tlsConfig, nil
 }
 
-func buildListener(addr string, tlsConfig *tls.Config) (net.Listener, error) {
-	// Create the net.Listener first, so we can detect
-	// initialization-time errors safely.
-	l, err := net.Listen("tcp", addr)
-	if err != nil {
-		return nil, err
-	}
-	if tlsConfig != nil {
-		l = tls.NewListener(l, tlsConfig)
-	}
-	return l, nil
-}
-
-func buildServer(h http.Handler, config *ServerConfig, addr string) (*http.Server, error) {
+// Serve HTTP(S) content on the specified address. If config.TLS is
+// not nil, enable HTTPS and TLS authentication.
+//
+// This function will return an error if there are problems creating
+// the listener, otherwise it will handle graceful termination on
+// SIGINT or SIGTERM and return nil.
+func Serve(h http.Handler, config *ServerConfig, addr string) error {
 	// Wrap with tracing handler (exclude metrics and other
 	// debugging endpoints).
 	h = tracing.WrapHandler(h, guessEndpointName(addr))
@@ -125,7 +118,7 @@ func buildServer(h http.Handler, config *ServerConfig, addr string) (*http.Serve
 	// Create the top-level HTTP handler with all our additions.
 	hh, tlsConfig, err := config.buildHTTPHandler(h)
 	if err != nil {
-		return nil, err
+		return err
 	}
 
 	// These are not meant to be external-facing servers, so we
@@ -138,24 +131,14 @@ func buildServer(h http.Handler, config *ServerConfig, addr string) (*http.Serve
 		TLSConfig:         tlsConfig,
 	}
 
-	return srv, nil
-}
-
-// Serve HTTP(S) content on the specified address. If config.TLS is
-// not nil, enable HTTPS and TLS authentication.
-//
-// This function will return an error if there are problems creating
-// the listener, otherwise it will handle graceful termination on
-// SIGINT or SIGTERM and return nil.
-func Serve(h http.Handler, config *ServerConfig, addr string) error {
-	srv, err := buildServer(h, config, addr)
+	// Create the net.Listener first, so we can detect
+	// initialization-time errors safely.
+	l, err := net.Listen("tcp", addr)
 	if err != nil {
 		return err
 	}
-
-	l, err := buildListener(addr, srv.TLSConfig)
-	if err != nil {
-		return err
+	if srv.TLSConfig != nil {
+		l = tls.NewListener(l, srv.TLSConfig)
 	}
 
 	// Install a signal handler for gentle process termination.
@@ -193,38 +176,6 @@ func Serve(h http.Handler, config *ServerConfig, addr string) error {
 	return nil
 }
 
-// ServeWithContext operates like Serve but with a controlling Context
-// that can be used to stop the HTTP server.
-func ServeWithContext(ctx context.Context, h http.Handler, config *ServerConfig, addr string) error {
-	srv, err := buildServer(h, config, addr)
-	if err != nil {
-		return err
-	}
-
-	l, err := buildListener(addr, srv.TLSConfig)
-	if err != nil {
-		return err
-	}
-
-	go func() {
-		<-ctx.Done()
-
-		sctx, cancel := context.WithTimeout(context.Background(), gracefulShutdownTimeout)
-		srv.Shutdown(sctx) // nolint: errcheck
-		srv.Close()
-		cancel()
-	}()
-
-	daemon.SdNotify(false, "READY=1") // nolint
-
-	err = srv.Serve(l)
-	if err == http.ErrServerClosed {
-		err = nil
-	}
-
-	return err
-}
-
 func addDefaultHandlers(h http.Handler) http.Handler {
 	root := http.NewServeMux()