// Read a bulk as defined in the Redis protocol
//
// This functon is similar to that of gedis.ReadBulk, however given
// that a Redis client can only send a multi-bulk requests that only
// include non-nil bulks of bytes, a simplified version that returns a
// sequence of bytes is provided.
func readBulk(r gedis.Reader) (bs []byte, err error) {
var b byte
b, err = readByte(r)
if err != nil {
return bs, err
} else if b != '$' {
return bs, gedis.NewParseError("Invalid first character")
}
n, err := gedis.ReadNumber(r)
if err != nil {
return bs, err
}
bs = make([]byte, n)
_, err = r.Read(bs)
if err != nil {
return bs, err
}
crlf := make([]byte, 2)
if _, err = r.Read(crlf); err != nil {
return bs, err
}
if crlf[0] != '\r' || crlf[1] != '\n' {
return bs, gedis.NewParseError("Invalid EOL")
}
return
}
// Helper function to read the next byte in a gedis.Reader
func readByte(r gedis.Reader) (byte, error) {
b := make([]byte, 1)
_, err := r.Read(b)
return b[0], err
}