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transport.go
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transport.go
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// Copyright (C) 2019 Nick Rosbrook
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package vici
import (
"bytes"
"encoding/binary"
"io"
"net"
)
const (
// Each segment is prefixed by a 4-byte header in network oreder
headerLength = 4
)
type transport struct {
conn net.Conn
}
func (t *transport) send(pkt *packet) error {
buf := bytes.NewBuffer([]byte{})
b, err := pkt.bytes()
if err != nil {
return err
}
// Write the packet length
pl := make([]byte, headerLength)
binary.BigEndian.PutUint32(pl, uint32(len(b)))
_, err = buf.Write(pl)
if err != nil {
return err
}
// Write the payload
_, err = buf.Write(b)
if err != nil {
return err
}
_, err = t.conn.Write(buf.Bytes())
if err != nil {
return err
}
return nil
}
func (t *transport) recv() (*packet, error) {
buf := make([]byte, headerLength)
_, err := io.ReadFull(t.conn, buf)
if err != nil {
return nil, err
}
pl := binary.BigEndian.Uint32(buf)
buf = make([]byte, int(pl))
_, err = io.ReadFull(t.conn, buf)
if err != nil {
return nil, err
}
p := &packet{}
err = p.parse(buf)
if err != nil {
return nil, err
}
return p, nil
}