chore: optimize pr 4979 (#4988)

Signed-off-by: kevin <wanjunfeng@gmail.com>

core/mapping/unmarshaler.go

@@ -30,7 +30,9 @@ var (
 	errValueNotSettable = errors.New("value is not settable")
 	errValueNotStruct   = errors.New("value type is not struct")
 	keyUnmarshaler      = NewUnmarshaler(defaultKeyName)
+	boolType            = reflect.TypeOf(false)
 	durationType        = reflect.TypeOf(time.Duration(0))
+	stringType          = reflect.TypeOf("")
 	cacheKeys           = make(map[string][]string)
 	cacheKeysLock       sync.Mutex
 	defaultCache        = make(map[string]any)
@@ -765,24 +767,24 @@ func (u *Unmarshaler) processFieldWithEnvValue(fieldType reflect.Type, value ref
 		return err
 	}
 
-	fieldKind := fieldType.Kind()
+	derefType := Deref(fieldType)
-	switch true {
+	switch derefType {
-	case fieldKind == reflect.Bool:
+	case boolType:
 		val, err := strconv.ParseBool(envVal)
 		if err != nil {
 			return fmt.Errorf("unmarshal field %q with environment variable, %w", fullName, err)
 		}
 
-		value.SetBool(val)
+		SetValue(fieldType, value, reflect.ValueOf(val))
 		return nil
-	case fieldType == durationType:
+	case durationType:
 		if err := fillDurationValue(fieldType, value, envVal); err != nil {
 			return fmt.Errorf("unmarshal field %q with environment variable, %w", fullName, err)
 		}
 
 		return nil
-	case fieldKind == reflect.String:
+	case stringType:
-		value.SetString(envVal)
+		SetValue(fieldType, value, reflect.ValueOf(envVal))
 		return nil
 	default:
 		return u.processFieldPrimitiveWithJSONNumber(fieldType, value, json.Number(envVal), opts, fullName)

core/mapping/unmarshaler_test.go

@@ -4801,20 +4801,33 @@ func TestUnmarshal_EnvBoolBad(t *testing.T) {
 }
 
 func TestUnmarshal_EnvDuration(t *testing.T) {
-	type Value struct {
-		Duration time.Duration `key:"duration,env=TEST_NAME_DURATION"`
-	}
-
 	const (
 		envName = "TEST_NAME_DURATION"
 		envVal  = "1s"
 	)
 	t.Setenv(envName, envVal)
 
+	t.Run("valid duration", func(t *testing.T) {
+		type Value struct {
+			Duration time.Duration `key:"duration,env=TEST_NAME_DURATION"`
+		}
+
 		var v Value
 		if assert.NoError(t, UnmarshalKey(emptyMap, &v)) {
 			assert.Equal(t, time.Second, v.Duration)
 		}
+	})
+
+	t.Run("ptr of duration", func(t *testing.T) {
+		type Value struct {
+			Duration *time.Duration `key:"duration,env=TEST_NAME_DURATION"`
+		}
+
+		var v Value
+		if assert.NoError(t, UnmarshalKey(emptyMap, &v)) {
+			assert.Equal(t, time.Second, *v.Duration)
+		}
+	})
 }
 
 func TestUnmarshal_EnvDurationBadValue(t *testing.T) {