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92 lines
1.9 KiB
Go

package main
import (
"bufio"
"fmt"
"io"
"strconv"
)
var (
start_string byte = '+'
start_error byte = '-'
start_integer byte = ':'
start_bulkstring byte = '$'
start_array byte = '*'
)
type value interface {
}
func readValue(r io.Reader) (value, error) {
br := bufio.NewReader(r)
line, err := br.ReadBytes('\n')
switch err {
case io.EOF:
if line != nil {
break
}
return nil, err
case nil:
break
default:
return nil, fmt.Errorf("unable to read value in redis protocol: %v")
}
if len(line) < 3 {
return nil, fmt.Errorf("unable to read redis protocol value: input is too small")
}
if line[len(line)-2] != '\r' {
return nil, fmt.Errorf("unable to read redis protocol value: bad line terminator")
}
line = line[:len(line)-2]
switch line[0] {
case start_string:
return readString(line[1:])
case start_error:
return readError(line[1:])
case start_integer:
return readInteger(line[1:])
case start_bulkstring:
return readBulkString(line[1:], r)
default:
return nil, fmt.Errorf("unable to read redis protocol value: illegal start character: %c", line[0])
}
}
// ------------------------------------------------------------------------------
type String string
func readString(b []byte) (value, error) {
return String(b), nil
}
// ------------------------------------------------------------------------------
type Error string
func readError(b []byte) (value, error) {
return Error(b), nil
}
// ------------------------------------------------------------------------------
type Integer int64
func readInteger(b []byte) (value, error) {
i, err := strconv.ParseInt(string(b), 10, 64)
if err != nil {
return nil, fmt.Errorf("unable to read integer in redis protocol format: %v", err)
}
return Integer(i), nil
}
// -----------------------------------------------------------------------------------------
type BulkString string
func readBulkString(prefix []byte, r io.Reader) (value, error) {
return nil, nil
}