func()

in server.go [34:83]

• 37 lines of code
• 7 McCabe index (conditional complexity)

func (a *theApp) listenAndServe(server *http.Server, addr string, h http.Handler, opts ...option) error {
	config := &listenerConfig{}

	for _, opt := range opts {
		opt(config)
	}

	// create server
	server.Handler = h
	server.TLSConfig = config.tlsConfig

	// ensure http2 is enabled even if TLSConfig is not null
	// See https://github.com/golang/go/blob/97cee43c93cfccded197cd281f0a5885cdb605b4/src/net/http/server.go#L2947-L2954
	if server.TLSConfig != nil {
		server.TLSConfig.NextProtos = append(server.TLSConfig.NextProtos, "h2")
	}

	lc := net.ListenConfig{
		KeepAlive: a.config.Server.ListenKeepAlive,
	}

	l, err := listenAddr(context.Background(), &lc, addr)
	if err != nil {
		return fmt.Errorf("failed to listen on addr %s: %w", addr, err)
	}

	if config.limiter != nil {
		l = netutil.SharedLimitListener(l, config.limiter)
	}

	if config.isProxyV2 {
		l = &proxyproto.Listener{
			Listener: l,
			Policy: func(upstream net.Addr) (proxyproto.Policy, error) {
				return proxyproto.REQUIRE, nil
			},
		}
	}

	if config.tlsConfig != nil {
		l = tls.NewListener(l, server.TLSConfig)
	}

	log.WithFields(log.Fields{
		"config_addr": addr,
		"listen_addr": l.Addr(),
	}).Infof("server listening on: %s", l.Addr())

	return server.Serve(l)
}