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encoding.go
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/
encoding.go
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package gorpc
import (
"bufio"
"encoding/binary"
"github.com/golang/protobuf/proto"
"io"
)
type messageEncoder struct{ bw *bufio.Writer }
func (e *messageEncoder) Close() error { return nil }
func (e *messageEncoder) Flush() error { return e.bw.Flush() }
func (e *messageEncoder) Encode(msg proto.Message) error {
b, err := proto.Marshal(msg)
if err != nil {
return err
}
// first send the size of the payload
var bytes4 [4]byte
var sizeb = bytes4[:]
binary.LittleEndian.PutUint32(sizeb, uint32(len(b)))
if _, err := e.bw.Write(sizeb); err != nil {
return err
}
// then send the actual payload
_, err = e.bw.Write(b)
return err
}
func newMessageEncoder(w io.Writer, bufferSize int, s *ConnStats) *messageEncoder {
w = newWriterCounter(w, s)
bw := bufio.NewWriterSize(w, bufferSize)
return &messageEncoder{bw: bw}
}
type messageDecoder struct {
br io.Reader
}
func (d *messageDecoder) Close() error { return nil }
func (d *messageDecoder) Decode(msg proto.Message) error {
var bytes4 [4]byte
var sizeb = bytes4[:]
if _, err := io.ReadAtLeast(d.br, sizeb, 4); err != nil {
return err
}
size := binary.LittleEndian.Uint32(sizeb)
payload := make([]byte, size, size)
if _, err := io.ReadAtLeast(d.br, payload, int(size)); err != nil {
return err
}
return proto.Unmarshal(payload, msg)
}
func newMessageDecoder(r io.Reader, bufferSize int, s *ConnStats) *messageDecoder {
r = newReaderCounter(r, s)
br := bufio.NewReaderSize(r, bufferSize)
return &messageDecoder{br: br}
}