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Copy pathunpack.go
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101 lines (86 loc) · 1.61 KB
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package protocol
import (
"bufio"
"errors"
"io"
"strconv"
)
type Reader struct {
br *bufio.Reader
}
func NewReader(r io.Reader) *Reader {
return &Reader{
bufio.NewReader(r),
}
}
func (r *Reader) ReadMessage() (*Message, error) {
return UnpackFromReader(r.br)
}
func UnpackFromReader(r *bufio.Reader) (*Message, error) {
line, e := r.ReadBytes('\n')
if e != nil {
return nil, e
}
line = line[:len(line)-2]
switch line[0] {
case MessageError:
return &Message{
Type: MessageError,
Error: errors.New(string(line[1:])),
}, nil
case MessageStatus:
return &Message{
Type: MessageStatus,
Status: string(line[1:]),
}, nil
case MessageInt:
n, err := strconv.ParseInt(string(line[1:]), 10, 64)
if err != nil {
return nil, err
}
return &Message{
Type: MessageInt,
Integer: n,
}, nil
case MessageBulk:
l, err := strconv.Atoi(string(line[1:]))
if err != nil {
return nil, err
}
if l < 0 {
return &Message{
Bulk: nil,
Type: MessageBulk,
}, nil
}
buf := make([]byte, l+2)
if _, err := io.ReadFull(r, buf); err != nil {
return nil, err
}
return &Message{
Bulk: buf[:l],
Type: MessageBulk,
}, nil
case MessageMutli:
l, e := strconv.Atoi(string(line[1:]))
if e != nil {
return nil, e
}
if l < 0 {
return &Message{Type: MessageMutli}, nil
}
ret := make([]*Message, l)
for i := 0; i < l; i++ {
m, err := UnpackFromReader(r)
if err != nil {
return nil, err
}
ret[i] = m
}
return &Message{
Type: MessageMutli,
Multi: ret,
}, nil
}
return nil, errors.New("Received illegal data from redis.")
}