0e5d52de
 zhangqijia
reactor: 重构底层框架1.0
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}
type PBSplitter struct {}
func NewPBSplitter() *PBSplitter {
return &PBSplitter{}
}
func (m *PBSplitter) GetHeadLen() uint32 {
return uint32(binary.Size(PBHead{}))
}
func (m *PBSplitter) UnPack(data []byte) (IMessage,error) {
h := &PBHead{}
err := binary.Read(bytes.NewReader(data), binary.BigEndian, h)
if err != nil {
return nil, err
}
return &PBMessage{
Head: h,
Body: data[m.GetHeadLen():],
},nil
}
func (m *PBSplitter) ParseMsg (data []byte, atEOF bool) (advance int, token []byte, err error) {
// 表示我们已经扫描到结尾了
if atEOF && len(data) == 0 {
return 0, nil, nil
}
if !atEOF && len(data) >= int(m.GetHeadLen()) { //4字节数据包长度 4字节指令
length := int32(0)
binary.Read(bytes.NewReader(data[0:4]), binary.BigEndian, &length)
if length <= 0 {
return 0, nil, fmt.Errorf("length is 0")
}
if length > common.MaxPacketLength {
return 0, nil, fmt.Errorf("length exceeds maximum length")
}
if int(length) <= len(data) {
return int(length) , data[:int(length)], nil
}
return 0 , nil, nil
}
if atEOF {
return len(data), data, nil
}
return 0, nil, nil
}
func (m *PBSplitter) Pack(cmd uint32, data []byte, errcode int32, preserve uint32) ([]byte, error) {
buf := &bytes.Buffer{}
h := &PBHead{
Length: m.GetHeadLen()+ uint32(len(data)),
Cmd: cmd,
ErrCode: errcode,
PreField: preserve,
}
err := binary.Write(buf, binary.BigEndian, h)
if err != nil {
return nil, err
}
err = binary.Write(buf, binary.BigEndian, data)
if err != nil {
return nil, err
}
return buf.Bytes(), nil
}
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