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protocol.go
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protocol.go
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package protocol
import (
"errors"
"github.com/Terry-Mao/goim/pkg/bufio"
"github.com/Terry-Mao/goim/pkg/bytes"
"github.com/Terry-Mao/goim/pkg/encoding/binary"
"github.com/Terry-Mao/goim/pkg/websocket"
)
const (
// MaxBodySize max proto body size
MaxBodySize = int32(1 << 12)
)
const (
// size
_packSize = 4
_headerSize = 2
_verSize = 2
_opSize = 4
_seqSize = 4
_heartSize = 4
_rawHeaderSize = _packSize + _headerSize + _verSize + _opSize + _seqSize
_maxPackSize = MaxBodySize + int32(_rawHeaderSize)
// offset
_packOffset = 0
_headerOffset = _packOffset + _packSize
_verOffset = _headerOffset + _headerSize
_opOffset = _verOffset + _verSize
_seqOffset = _opOffset + _opSize
_heartOffset = _seqOffset + _seqSize
)
var (
// ErrProtoPackLen proto packet len error
ErrProtoPackLen = errors.New("default server codec pack length error")
// ErrProtoHeaderLen proto header len error
ErrProtoHeaderLen = errors.New("default server codec header length error")
)
var (
// ProtoReady proto ready
ProtoReady = &Proto{Op: OpProtoReady}
// ProtoFinish proto finish
ProtoFinish = &Proto{Op: OpProtoFinish}
)
// WriteTo write a proto to bytes writer.
func (p *Proto) WriteTo(b *bytes.Writer) {
var (
packLen = _rawHeaderSize + int32(len(p.Body))
buf = b.Peek(_rawHeaderSize)
)
binary.BigEndian.PutInt32(buf[_packOffset:], packLen)
binary.BigEndian.PutInt16(buf[_headerOffset:], int16(_rawHeaderSize))
binary.BigEndian.PutInt16(buf[_verOffset:], int16(p.Ver))
binary.BigEndian.PutInt32(buf[_opOffset:], p.Op)
binary.BigEndian.PutInt32(buf[_seqOffset:], p.Seq)
if p.Body != nil {
b.Write(p.Body)
}
}
// ReadTCP read a proto from TCP reader.
func (p *Proto) ReadTCP(rr *bufio.Reader) (err error) {
var (
bodyLen int
headerLen int16
packLen int32
buf []byte
)
if buf, err = rr.Pop(_rawHeaderSize); err != nil {
return
}
packLen = binary.BigEndian.Int32(buf[_packOffset:_headerOffset])
headerLen = binary.BigEndian.Int16(buf[_headerOffset:_verOffset])
p.Ver = int32(binary.BigEndian.Int16(buf[_verOffset:_opOffset]))
p.Op = binary.BigEndian.Int32(buf[_opOffset:_seqOffset])
p.Seq = binary.BigEndian.Int32(buf[_seqOffset:])
if packLen > _maxPackSize {
return ErrProtoPackLen
}
if headerLen != _rawHeaderSize {
return ErrProtoHeaderLen
}
if bodyLen = int(packLen - int32(headerLen)); bodyLen > 0 {
p.Body, err = rr.Pop(bodyLen)
} else {
p.Body = nil
}
return
}
// WriteTCP write a proto to TCP writer.
func (p *Proto) WriteTCP(wr *bufio.Writer) (err error) {
var (
buf []byte
packLen int32
)
if p.Op == OpRaw {
// write without buffer, job concact proto into raw buffer
_, err = wr.WriteRaw(p.Body)
return
}
packLen = _rawHeaderSize + int32(len(p.Body))
if buf, err = wr.Peek(_rawHeaderSize); err != nil {
return
}
binary.BigEndian.PutInt32(buf[_packOffset:], packLen)
binary.BigEndian.PutInt16(buf[_headerOffset:], int16(_rawHeaderSize))
binary.BigEndian.PutInt16(buf[_verOffset:], int16(p.Ver))
binary.BigEndian.PutInt32(buf[_opOffset:], p.Op)
binary.BigEndian.PutInt32(buf[_seqOffset:], p.Seq)
if p.Body != nil {
_, err = wr.Write(p.Body)
}
return
}
// WriteTCPHeart write TCP heartbeat with room online.
func (p *Proto) WriteTCPHeart(wr *bufio.Writer, online int32) (err error) {
var (
buf []byte
packLen int
)
packLen = _rawHeaderSize + _heartSize
if buf, err = wr.Peek(packLen); err != nil {
return
}
// header
binary.BigEndian.PutInt32(buf[_packOffset:], int32(packLen))
binary.BigEndian.PutInt16(buf[_headerOffset:], int16(_rawHeaderSize))
binary.BigEndian.PutInt16(buf[_verOffset:], int16(p.Ver))
binary.BigEndian.PutInt32(buf[_opOffset:], p.Op)
binary.BigEndian.PutInt32(buf[_seqOffset:], p.Seq)
// body
binary.BigEndian.PutInt32(buf[_heartOffset:], online)
return
}
// ReadWebsocket read a proto from websocket connection.
func (p *Proto) ReadWebsocket(ws *websocket.Conn) (err error) {
var (
bodyLen int
headerLen int16
packLen int32
buf []byte
)
if _, buf, err = ws.ReadMessage(); err != nil {
return
}
if len(buf) < _rawHeaderSize {
return ErrProtoPackLen
}
packLen = binary.BigEndian.Int32(buf[_packOffset:_headerOffset])
headerLen = binary.BigEndian.Int16(buf[_headerOffset:_verOffset])
p.Ver = int32(binary.BigEndian.Int16(buf[_verOffset:_opOffset]))
p.Op = binary.BigEndian.Int32(buf[_opOffset:_seqOffset])
p.Seq = binary.BigEndian.Int32(buf[_seqOffset:])
if packLen < 0 || packLen > _maxPackSize {
return ErrProtoPackLen
}
if headerLen != _rawHeaderSize {
return ErrProtoHeaderLen
}
if bodyLen = int(packLen - int32(headerLen)); bodyLen > 0 {
p.Body = buf[headerLen:packLen]
} else {
p.Body = nil
}
return
}
// WriteWebsocket write a proto to websocket connection.
func (p *Proto) WriteWebsocket(ws *websocket.Conn) (err error) {
var (
buf []byte
packLen int
)
packLen = _rawHeaderSize + len(p.Body)
if err = ws.WriteHeader(websocket.BinaryMessage, packLen); err != nil {
return
}
if buf, err = ws.Peek(_rawHeaderSize); err != nil {
return
}
binary.BigEndian.PutInt32(buf[_packOffset:], int32(packLen))
binary.BigEndian.PutInt16(buf[_headerOffset:], int16(_rawHeaderSize))
binary.BigEndian.PutInt16(buf[_verOffset:], int16(p.Ver))
binary.BigEndian.PutInt32(buf[_opOffset:], p.Op)
binary.BigEndian.PutInt32(buf[_seqOffset:], p.Seq)
if p.Body != nil {
err = ws.WriteBody(p.Body)
}
return
}
// WriteWebsocketHeart write websocket heartbeat with room online.
func (p *Proto) WriteWebsocketHeart(wr *websocket.Conn, online int32) (err error) {
var (
buf []byte
packLen int
)
packLen = _rawHeaderSize + _heartSize
// websocket header
if err = wr.WriteHeader(websocket.BinaryMessage, packLen); err != nil {
return
}
if buf, err = wr.Peek(packLen); err != nil {
return
}
// proto header
binary.BigEndian.PutInt32(buf[_packOffset:], int32(packLen))
binary.BigEndian.PutInt16(buf[_headerOffset:], int16(_rawHeaderSize))
binary.BigEndian.PutInt16(buf[_verOffset:], int16(p.Ver))
binary.BigEndian.PutInt32(buf[_opOffset:], p.Op)
binary.BigEndian.PutInt32(buf[_seqOffset:], p.Seq)
// proto body
binary.BigEndian.PutInt32(buf[_heartOffset:], online)
return
}