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encoder.go
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encoder.go
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package resp
import (
"bufio"
"fmt"
"io"
"strconv"
)
// Encoder It's a resp encoder.
type Encoder struct {
writer *bufio.Writer
}
// NewEncoder Create a new resp encoder.
func NewEncoder(writer io.Writer) *Encoder {
bufwrite, ok := writer.(*bufio.Writer)
if !ok {
bufwrite = bufio.NewWriter(writer)
}
p := &Encoder{
writer: bufwrite,
}
return p
}
// Encode is encode the reply to writer.
func (w *Encoder) Encode(r Reply) error {
err := w.encodeData(r)
if err != nil {
return err
}
return w.writer.Flush()
}
func (w *Encoder) encodeKind(kind byte) error {
return w.writer.WriteByte(kind)
}
func (w *Encoder) encodeLine(data []byte) error {
_, err := w.writer.Write(data)
if err != nil {
return err
}
_, err = w.writer.Write(crlf)
if err != nil {
return err
}
return nil
}
func (w *Encoder) encodeData(r Reply) error {
switch t := r.(type) {
case ReplyBulk:
return w.encodeBulk(t)
case ReplyMultiBulk:
return w.encodeMultiBulk(t)
case ReplyInteger:
return w.encodeInteger(t)
case ReplyStatus:
return w.encodeStatus(t)
case ReplyError:
return w.encodeError(t)
}
return fmt.Errorf("errors protocol: undefined")
}
func (w *Encoder) encodeMultiBulk(r ReplyMultiBulk) error {
err := w.encodeKind(MultiBulk)
if err != nil {
return err
}
if r == nil {
err = w.encodeLine(nilVal)
if err != nil {
return err
}
return nil
}
err = w.encodeLine(strconv.AppendInt(nil, int64(len(r)), 10))
if err != nil {
return err
}
for _, raw := range r {
err := w.encodeData(raw)
if err != nil {
return err
}
}
return nil
}
func (w *Encoder) encodeBulk(r ReplyBulk) error {
err := w.encodeKind(Bulk)
if err != nil {
return err
}
if r == nil {
err = w.encodeLine(nilVal)
if err != nil {
return err
}
return nil
}
err = w.encodeLine(strconv.AppendInt(nil, int64(len(r)), 10))
if err != nil {
return err
}
return w.encodeLine([]byte(r))
}
func (w *Encoder) encodeInteger(r ReplyInteger) error {
err := w.encodeKind(Integer)
if err != nil {
return err
}
return w.encodeLine([]byte(r))
}
func (w *Encoder) encodeStatus(r ReplyStatus) error {
err := w.encodeKind(Status)
if err != nil {
return err
}
return w.encodeLine([]byte(r))
}
func (w *Encoder) encodeError(r ReplyError) error {
err := w.encodeKind(Error)
if err != nil {
return err
}
return w.encodeLine([]byte(r))
}