read from tcp conn

reader1.go

buff := make([]byte, 1024)
c := bufio.NewReader(conn)

for {
    // read a single byte which contains the message length
    size, err := c.ReadByte()
    if err != nil {
        return err
    }

    // read the full message, or return an error
    _, err := io.ReadFull(c, buff[:int(size)])
    if err != nil {
        return err
    }

    fmt.Printf("received %x\n", buff[:int(size)])
}

reader2.go

// Sender
// create the length prefix
prefix := make([]byte, 4)
binary.BigEndian.PutUint32(prefix, uint32(len(message)))

// write the prefix and the data to the stream (checking errors)
_, err := conn.Write(prefix)
_, err = conn.Write(message)

// Reader
// read the length prefix
prefix := make([]byte, 4)
_, err = io.ReadFull(conn, prefix)


length := binary.BigEndian.Uint32(prefix)
// verify length if there are restrictions

message = make([]byte, int(length))
_, err = io.ReadFull(conn, message)