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redis_reader.go
107 lines (92 loc) · 1.7 KB
/
redis_reader.go
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package iqdb
import (
"bufio"
"errors"
"io"
"strconv"
)
type redisReader struct {
r *bufio.Reader
}
func newRedisReader(r *bufio.Reader) *redisReader {
return &redisReader{
r: r,
}
}
func (r *redisReader) Read() (*redisMessage, error) {
return read(r.r)
}
// RedisClient protocol redisReader
func read(r *bufio.Reader) (*redisMessage, error) {
line, e := r.ReadBytes('\n')
if e != nil {
return nil, e
}
line = line[:len(line)-2]
msgtype := redisType(line[0])
data := string(line[1:])
switch msgtype {
case redisTypeString:
return &redisMessage{
Type: redisTypeString,
String: data,
}, nil
case redisTypeError:
return &redisMessage{
Type: redisTypeError,
Err: errors.New(data),
}, nil
case redisTypeInteger:
c, err := strconv.ParseInt(data, 10, 64)
if err != nil {
return nil, err
}
return &redisMessage{
Type: redisTypeInteger,
Int: c,
}, nil
case redisTypeArray:
l, e := strconv.Atoi(data)
if e != nil {
return nil, e
}
if l == -1 {
return &redisMessage{
Type: redisTypeArray,
Arr: nil,
}, nil
}
ret := make([]*redisMessage, l)
for i := 0; i < l; i++ {
m, err := read(r)
if err != nil {
return nil, err
}
ret[i] = m
}
return &redisMessage{
Type: redisTypeArray,
Arr: ret,
}, nil
case redisTypeBulk:
l, e := strconv.Atoi(data)
if e != nil {
return nil, e
}
if l < 0 {
return &redisMessage{
Bulk: nil,
Type: redisTypeBulk,
}, nil
}
buf := make([]byte, l+2)
if _, err := io.ReadFull(r, buf); err != nil {
return nil, err
}
return &redisMessage{
Bulk: buf[:l],
Type: redisTypeBulk,
}, nil
}
return nil, errors.New("error parsing RedisClient protocol")
}