Support Probabilistic commands with RESP 2 protocol (#3176)

* Support bloom resp 2

* Support Resp2 for BF.Info

* simplify BFInfoCmd field assignment using map-based key-to-field references

Author: ofekshenawa

probabilistic.go

@@ -319,37 +319,69 @@ func (cmd *BFInfoCmd) Result() (BFInfo, error) {
 }
 
 func (cmd *BFInfoCmd) readReply(rd *proto.Reader) (err error) {
-	n, err := rd.ReadMapLen()
+	result := BFInfo{}
+
+	// Create a mapping from key names to pointers of struct fields
+	respMapping := map[string]*int64{
+		"Capacity":                 &result.Capacity,
+		"CAPACITY":                 &result.Capacity,
+		"Size":                     &result.Size,
+		"SIZE":                     &result.Size,
+		"Number of filters":        &result.Filters,
+		"FILTERS":                  &result.Filters,
+		"Number of items inserted": &result.ItemsInserted,
+		"ITEMS":                    &result.ItemsInserted,
+		"Expansion rate":           &result.ExpansionRate,
+		"EXPANSION":                &result.ExpansionRate,
+	}
+
+	// Helper function to read and assign a value based on the key
+	readAndAssignValue := func(key string) error {
+		fieldPtr, exists := respMapping[key]
+		if !exists {
+			return fmt.Errorf("redis: BLOOM.INFO unexpected key %s", key)
+		}
+
+		// Read the integer and assign to the field via pointer dereferencing
+		val, err := rd.ReadInt()
+		if err != nil {
+			return err
+		}
+		*fieldPtr = val
+		return nil
+	}
+
+	readType, err := rd.PeekReplyType()
 	if err != nil {
 		return err
 	}
 
-	var key string
-	var result BFInfo
-	for f := 0; f < n; f++ {
-		key, err = rd.ReadString()
+	if len(cmd.args) > 2 && readType == proto.RespArray {
+		n, err := rd.ReadArrayLen()
 		if err != nil {
 			return err
 		}
-
-		switch key {
-		case "Capacity":
-			result.Capacity, err = rd.ReadInt()
-		case "Size":
-			result.Size, err = rd.ReadInt()
-		case "Number of filters":
-			result.Filters, err = rd.ReadInt()
-		case "Number of items inserted":
-			result.ItemsInserted, err = rd.ReadInt()
-		case "Expansion rate":
-			result.ExpansionRate, err = rd.ReadInt()
-		default:
-			return fmt.Errorf("redis: BLOOM.INFO unexpected key %s", key)
+		if key, ok := cmd.args[2].(string); ok && n == 1 {
+			if err := readAndAssignValue(key); err != nil {
+				return err
+			}
+		} else {
+			return fmt.Errorf("redis: BLOOM.INFO invalid argument key type")
 		}
-
+	} else {
+		n, err := rd.ReadMapLen()
 		if err != nil {
 			return err
 		}
+		for i := 0; i < n; i++ {
+			key, err := rd.ReadString()
+			if err != nil {
+				return err
+			}
+			if err := readAndAssignValue(key); err != nil {
+				return err
+			}
+		}
 	}
 
 	cmd.val = result