fix: extract data using jmespath

Change-Id: Icea3b8fa7e71dd610c19c91e21a259104ab2fe30

parser.go

@@ -69,8 +69,7 @@ func (p *parser) parseData(raw interface{}, variablesMapping map[string]interfac
 	case reflect.String:
 		// json.Number
 		if rawValue, ok := raw.(json.Number); ok {
-			// use the same rule as json.Unmarshal (float64, for JSON numbers)
-			return rawValue.Float64()
+			return parseJSONNumber(rawValue)
 		}
 		// other string
 		value := rawValue.String()
@@ -109,6 +108,16 @@ func (p *parser) parseData(raw interface{}, variablesMapping map[string]interfac
 	}
 }
 
+func parseJSONNumber(raw json.Number) (interface{}, error) {
+	if strings.Contains(raw.String(), ".") {
+		// float64
+		return raw.Float64()
+	} else {
+		// int64
+		return raw.Int64()
+	}
+}
+
 const (
 	regexVariable     = `[a-zA-Z_]\w*`    // variable name should start with a letter or underscore
 	regexFunctionName = `[a-zA-Z_]\w*`    // function name should start with a letter or underscore