Skip the empty \r\n during redis-cli --pipe (#1514)

* skip the empty \r\n after redis-cli --pipe done sending data and before the ECHO

* use len() to determine for PR #1514

Author: fancy-rabbit

pkg/proxy/redis/decoder.go

@@ -211,6 +211,9 @@ func (d *Decoder) decodeSingleLineMultiBulk() ([]*Resp, error) {
 	if err != nil {
 		return nil, err
 	}
+	if len(b) == 0 {
+		return nil, nil
+	}
 	multi := make([]*Resp, 0, 8)
 	for l, r := 0, 0; r <= len(b); r++ {
 		if r == len(b) || b[r] == ' ' {

pkg/proxy/session.go

@@ -164,6 +164,9 @@ func (s *Session) loopReader(tasks *RequestChan, d *Router) (err error) {
 		if err != nil {
 			return err
 		}
+		if len(multi) == 0 {
+			continue
+		}
 		s.incrOpTotal()
 
 		if tasks.Buffered() > maxPipelineLen {