add func get value by key with binding

get_by_key.go

@@ -3,6 +3,7 @@ package redisdb
 import (
 	"context"
 	"encoding/json"
+	"errors"
 )
 
 // GetValueByKey ...
@@ -15,14 +16,11 @@ func (s Server) GetValueByKey(ctx context.Context, key string) string {
 	return value
 }
 
-// GetJSON ...
+// GetValueByKeyWithBinding ...
-func (s Server) GetJSON(ctx context.Context, key string, result interface{}) (ok bool) {
+func (s Server) GetValueByKeyWithBinding(ctx context.Context, key string, result interface{}) error {
 	v := s.GetValueByKey(ctx, key)
 	if v == "" {
-		return false
+		return errors.New("key not found")
 	}
-	if err := json.Unmarshal([]byte(v), result); err != nil {
+	return json.Unmarshal([]byte(v), result)
-		return false
-	}
-	return true
 }