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protocol.go
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protocol.go
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package protocol
import (
"encoding/binary"
"io"
"net"
)
// Protocol describes the basic behavior of any protocol in the system
type Protocol interface {
IOLoop(conn net.Conn) error
}
// SendResponse is a server side utility function to prefix data with a length header
// and write to the supplied Writer
func SendResponse(w io.Writer, data []byte) (int, error) {
err := binary.Write(w, binary.BigEndian, int32(len(data)))
if err != nil {
return 0, err
}
n, err := w.Write(data)
if err != nil {
return 0, err
}
return (n + 4), nil
}
// SendFramedResponse is a server side utility function to prefix data with a length header
// and frame header and write to the supplied Writer
func SendFramedResponse(w io.Writer, frameType int32, data []byte) (int, error) {
beBuf := make([]byte, 4)
size := uint32(len(data)) + 4
binary.BigEndian.PutUint32(beBuf, size)
n, err := w.Write(beBuf)
if err != nil {
return n, err
}
binary.BigEndian.PutUint32(beBuf, uint32(frameType))
n, err = w.Write(beBuf)
if err != nil {
return n + 4, err
}
n, err = w.Write(data)
return n + 8, err
}