net_transport.go
func NewNetworkTransport(
	stream StreamLayer,
	maxPool int,
	timeout time.Duration,
	logOutput io.Writer,
) *NetworkTransport {
	if logOutput == nil {
		logOutput = os.Stderr
	}
	logger := log.New(logOutput, "", log.LstdFlags)
	config := &NetworkTransportConfig{Stream: stream, MaxPool: maxPool, Timeout: timeout, Logger: logger}
	return NewNetworkTransportWithConfig(config)
}
func NewNetworkTransport(
	stream StreamLayer,
	maxPool int,
	timeout time.Duration,
	logOutput io.Writer,
) *NetworkTransport {
	if logOutput == nil {
		logOutput = os.Stderr
	}
	logger := log.New(logOutput, "", log.LstdFlags)
	config := &NetworkTransportConfig{Stream: stream, MaxPool: maxPool, Timeout: timeout, Logger: logger}
	return NewNetworkTransportWithConfig(config)
}
// NewNetworkTransport creates a new network transport with the given dialer
// and listener. The maxPool controls how many connections we will pool. The
// timeout is used to apply I/O deadlines. For InstallSnapshot, we multiply
// the timeout by (SnapshotSize / TimeoutScale).