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// Copyright (C) 2015 Audrius Butkevicius and Contributors (see the CONTRIBUTORS file).
package protocol
import (
"errors"
"fmt"
"io"
)
const (
magic = 0x9E79BC40
ProtocolName = "bep-relay"
)
var (
ResponseSuccess = Response{0, "success"}
ResponseNotFound = Response{1, "not found"}
ResponseAlreadyConnected = Response{2, "already connected"}
ResponseUnexpectedMessage = Response{100, "unexpected message"}
)
func WriteMessage(w io.Writer, message interface{}) error {
header := header{
magic: magic,
}
var payload []byte
var err error
switch msg := message.(type) {
case Ping:
payload, err = msg.MarshalXDR()
header.messageType = messageTypePing
case Pong:
payload, err = msg.MarshalXDR()
header.messageType = messageTypePong
case JoinRelayRequest:
payload, err = msg.MarshalXDR()
header.messageType = messageTypeJoinRelayRequest
case JoinSessionRequest:
payload, err = msg.MarshalXDR()
header.messageType = messageTypeJoinSessionRequest
case Response:
payload, err = msg.MarshalXDR()
header.messageType = messageTypeResponse
case ConnectRequest:
payload, err = msg.MarshalXDR()
header.messageType = messageTypeConnectRequest
case SessionInvitation:
payload, err = msg.MarshalXDR()
header.messageType = messageTypeSessionInvitation
case RelayFull:
payload, err = msg.MarshalXDR()
header.messageType = messageTypeRelayFull
default:
err = errors.New("unknown message type")
}
if err != nil {
return err
}
header.messageLength = int32(len(payload))
headerpayload, err := header.MarshalXDR()
if err != nil {
return err
}
_, err = w.Write(append(headerpayload, payload...))
return err
}
func ReadMessage(r io.Reader) (interface{}, error) {
var header header
buf := make([]byte, header.XDRSize())
if _, err := io.ReadFull(r, buf); err != nil {
return nil, err
}
if err := header.UnmarshalXDR(buf); err != nil {
return nil, err
}
if header.magic != magic {
return nil, errors.New("magic mismatch")
}
if header.messageLength < 0 || header.messageLength > 1024 {
return nil, fmt.Errorf("bad length (%d)", header.messageLength)
}
buf = make([]byte, int(header.messageLength))
if _, err := io.ReadFull(r, buf); err != nil {
return nil, err
}
switch header.messageType {
case messageTypePing:
var msg Ping
err := msg.UnmarshalXDR(buf)
return msg, err
case messageTypePong:
var msg Pong
err := msg.UnmarshalXDR(buf)
return msg, err
case messageTypeJoinRelayRequest:
var msg JoinRelayRequest
err := msg.UnmarshalXDR(buf)
return msg, err
case messageTypeJoinSessionRequest:
var msg JoinSessionRequest
err := msg.UnmarshalXDR(buf)
return msg, err
case messageTypeResponse:
var msg Response
err := msg.UnmarshalXDR(buf)
return msg, err
case messageTypeConnectRequest:
var msg ConnectRequest
err := msg.UnmarshalXDR(buf)
return msg, err
case messageTypeSessionInvitation:
var msg SessionInvitation
err := msg.UnmarshalXDR(buf)
return msg, err
case messageTypeRelayFull:
var msg RelayFull
err := msg.UnmarshalXDR(buf)
return msg, err
}
return nil, errors.New("unknown message type")
}
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