fix #2109 (#2116)

core/jsonx/json.go

@@ -13,6 +13,16 @@ func Marshal(v interface{}) ([]byte, error) {
 	return json.Marshal(v)
 }
 
+// MarshalToString marshals v into a string.
+func MarshalToString(v interface{}) (string, error) {
+	data, err := Marshal(v)
+	if err != nil {
+		return "", err
+	}
+
+	return string(data), nil
+}
+
 // Unmarshal unmarshals data bytes into v.
 func Unmarshal(data []byte, v interface{}) error {
 	decoder := json.NewDecoder(bytes.NewReader(data))
@@ -53,12 +63,3 @@ func unmarshalUseNumber(decoder *json.Decoder, v interface{}) error {
 func formatError(v string, err error) error {
 	return fmt.Errorf("string: `%s`, error: `%w`", v, err)
 }
-
-// MarshalToString marshals v into string.
-func MarshalToString(v interface{}) (string, error) {
-	data, err := Marshal(v)
-	if err != nil {
-		return "", formatError(string(data), err)
-	}
-	return string(data), nil
-}

core/jsonx/json_test.go

@@ -20,6 +20,22 @@ func TestMarshal(t *testing.T) {
 	assert.Equal(t, `{"name":"John","age":30}`, string(bs))
 }
 
+func TestMarshalToString(t *testing.T) {
+	var v = struct {
+		Name string `json:"name"`
+		Age  int    `json:"age"`
+	}{
+		Name: "John",
+		Age:  30,
+	}
+	toString, err := MarshalToString(v)
+	assert.Nil(t, err)
+	assert.Equal(t, `{"name":"John","age":30}`, toString)
+
+	_, err = MarshalToString(make(chan int))
+	assert.NotNil(t, err)
+}
+
 func TestUnmarshal(t *testing.T) {
 	const s = `{"name":"John","age":30}`
 	var v struct {
@@ -85,16 +101,3 @@ func TestUnmarshalFromReaderError(t *testing.T) {
 	err := UnmarshalFromReader(strings.NewReader(s), &v)
 	assert.NotNil(t, err)
 }
-
-func TestMarshalToString(t *testing.T) {
-	var v = struct {
-		Name string `json:"name"`
-		Age  int    `json:"age"`
-	}{
-		Name: "John",
-		Age:  30,
-	}
-	toString, err := MarshalToString(v)
-	assert.Nil(t, err)
-	assert.Equal(t, `{"name":"John","age":30}`, toString)
-}