perf: slightly optimize config/config.go

- Exclude the struct tag is space
 - Exclude configuration file comment, which is starting with space

fix: in the case of panic unexpected happened in the method parse0 of parser/parser.go, closing of the channel is needed to prevent the program from getting stuck~
  - fine-tune the coding of parser/parser.go

Limited ability, hope to make it better~

config/config.go

@@ -50,7 +50,7 @@ func parse(src io.Reader) *ServerProperties {
 	scanner := bufio.NewScanner(src)
 	for scanner.Scan() {
 		line := scanner.Text()
-		if len(line) > 0 && line[0] == '#' {
+		if len(line) > 0 && strings.TrimLeft(line, " ")[0] == '#' {
 			continue
 		}
 		pivot := strings.IndexAny(line, " ")
@@ -72,7 +72,7 @@ func parse(src io.Reader) *ServerProperties {
 		field := t.Elem().Field(i)
 		fieldVal := v.Elem().Field(i)
 		key, ok := field.Tag.Lookup("cfg")
-		if !ok {
+		if !ok || strings.TrimLeft(key, " ") == "" {
 			key = field.Name
 		}
 		value, ok := rawMap[strings.ToLower(key)]

redis/parser/parser.go

@@ -76,6 +76,7 @@ func parse0(reader io.Reader, ch chan<- *Payload) {
 	defer func() {
 		if err := recover(); err != nil {
 			logger.Error(err, string(debug.Stack()))
+			close(ch)
 		}
 	}()
 
@@ -88,17 +89,12 @@ func parse0(reader io.Reader, ch chan<- *Payload) {
 		var ioErr bool
 		msg, ioErr, err = readLine(bufReader, &state)
 		if err != nil {
+			ch <- &Payload{Err: err}
 			if ioErr { // encounter io err, stop read
-				ch <- &Payload{
-					Err: err,
-				}
 				close(ch)
 				return
 			}
 			// protocol err, reset read state
-			ch <- &Payload{
-				Err: err,
-			}
 			state = readState{}
 			continue
 		}
@@ -227,9 +223,8 @@ func parseMultiBulkHeader(msg []byte, state *readState) error {
 		state.expectedArgsCount = int(expectedLine)
 		state.args = make([][]byte, 0, expectedLine)
 		return nil
-	} else {
-		return errors.New("protocol error: " + string(msg))
 	}
+	return errors.New("protocol error: " + string(msg))
 }
 
 func parseBulkHeader(msg []byte, state *readState) error {
@@ -246,9 +241,8 @@ func parseBulkHeader(msg []byte, state *readState) error {
 		state.expectedArgsCount = 1
 		state.args = make([][]byte, 0, 1)
 		return nil
-	} else {
-		return errors.New("protocol error: " + string(msg))
 	}
+	return errors.New("protocol error: " + string(msg))
 }
 
 func parseSingleLineReply(msg []byte) (redis.Reply, error) {