Question

In Go, a TCP connection (net.Conn) is a io.ReadWriteCloser. I’d like to test my network code by simulating a TCP connection. There are two requirements that I have:

1. the data to be read is stored in a string
2. whenever data is written, I’d like it to be stored in some kind of buffer which I can access later

Is there a data structure for this, or an easy way to make one?

Answer 1

Why not using bytes.Buffer? It’s an io.ReadWriter and has a String method to get the stored data. If you need to make it an io.ReadWriteCloser, you could define you own type:

type CloseableBuffer struct {
    bytes.Buffer
}

and define a Close method:

func (b *CloseableBuffer) Close() error {
    return nil
}