golang将字节数组转换为结构

Question

I am looking for clean way to cast byte array to struct for client-server application. I know most ppl turn to gob package for this solution however I do not control the encoding for the application. that being said, I only programmed the server application not the client, there is a mutual contract for the protocol that is being exchanged.

The best I could come out is the following.

type T struct {
    A int16
    B int8
    C []byte
}

func main() {
    // Create a struct and write it.
    t := T{A: 99, B: 10}
    buf := &bytes.Buffer{}

    buf1 := []byte{5, 100, 100}
    fmt.Println(buf1)

    buf.Write(buf1)

    //err := binary.Write(buf, binary.BigEndian, t)

    //if err != nil {
    //  panic(err)
    //}
    fmt.Println(buf)

    // Read into an empty struct.
    t = T{}
    err := binary.Read(buf, binary.BigEndian, &t)
    if err != nil {
        panic(err)
    }
    fmt.Printf("%d %d", t.A, t.B)
}

However, as soon as number bytes does not coincide with the size of the struct, then go will send a panic. How can I modify this to work without the panic if undersize or oversize

<kbd>Go playground</kbd>

Answer 1

Given that you are using a private protocol. It's a good idea to implement your own protocol. There are many examples of how to do this.

You are only limited by the implementing of your encoder. I'd recommend looking at the json.Decoder for handling buffers rather than looking at straight byte slices. These operate on buffers and are very useful for large data streams.