INNER CODE UNIT · Go

hostIsContainerLocal

docker/compose · relay/main.go:125

func hostIsContainerLocal(host string) bool {
	if host == "localhost" {
		return true
	}
	ip := net.ParseIP(host)
	return ip != nil && (ip.IsLoopback() || ip.IsUnspecified())
}

// serve accepts connections until the listener closes. In-flight forwards
// join the WaitGroup, so on SIGTERM the process stops accepting (listeners
// close) but drains established connections until they finish — or until the
// engine's stop timeout escalates to SIGKILL.
func serve(ctx context.Context, listener net.Listener, upstream string, wg *sync.WaitGroup) {
	backoff := 5 * time.Millisecond
	for {
		conn, err := listener.Accept()
		if err != nil {
			if ctx.Err() != nil {

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