feat: custom type func support interface

util.go

@@ -42,8 +42,7 @@ BEGIN:
 	default:
 
 		if v.v.hasCustomFuncs {
-
-			if fn, ok := v.v.customFuncs[current.Type()]; ok {
+			if fn, ok := v.findCustomTypeFunc(current.Type()); ok {
 				current = reflect.ValueOf(fn(current))
 				goto BEGIN
 			}
@@ -53,6 +52,42 @@ BEGIN:
 	}
 }
 
+func (v *validate) findCustomTypeFunc(typ reflect.Type) (CustomTypeFunc, bool) {
+	// fast path
+	if fn, ok := v.v.customFuncs.Load(typ); ok {
+		if fn == nil {
+			return nil, false
+		}
+		return fn.(CustomTypeFunc), true
+	}
+
+	// slow path
+	var fn CustomTypeFunc
+	var found bool
+
+	// iterate the customFuncs to find if the typ implement any interface type registered
+	v.v.customFuncs.Range(func(key, value interface{}) bool {
+		keyTyp := key.(reflect.Type)
+		if keyTyp.Kind() != reflect.Interface {
+			return true
+		}
+
+		if typ.Implements(keyTyp) {
+			fn = value.(CustomTypeFunc)
+			found = true
+			return false
+		}
+		return true
+	})
+
+	if found {
+		v.v.customFuncs.Store(typ, fn)
+	} else {
+		v.v.customFuncs.Store(typ, nil)
+	}
+	return fn, found
+}
+
 // getStructFieldOKInternal traverses a struct to retrieve a specific field denoted by the provided namespace and
 // returns the field, field kind and whether is was successful in retrieving the field at all.
 //

validator_instance.go

@@ -82,7 +82,7 @@ type Validate struct {
 	hasTagNameFunc   bool
 	tagNameFunc      TagNameFunc
 	structLevelFuncs map[reflect.Type]StructLevelFuncCtx
-	customFuncs      map[reflect.Type]CustomTypeFunc
+	customFuncs      sync.Map
 	aliases          map[string]string
 	validations      map[string]internalValidationFuncWrapper
 	transTagFunc     map[ut.Translator]map[string]TranslationFunc // map[<locale>]map[<tag>]TranslationFunc
@@ -152,7 +152,7 @@ func (v *Validate) SetTagName(name string) {
 
 // ValidateMapCtx validates a map using a map of validation rules and allows passing of contextual
 // validation validation information via context.Context.
-func (v Validate) ValidateMapCtx(ctx context.Context, data map[string]interface{}, rules map[string]interface{}) map[string]interface{} {
+func (v *Validate) ValidateMapCtx(ctx context.Context, data map[string]interface{}, rules map[string]interface{}) map[string]interface{} {
 	errs := make(map[string]interface{})
 	for field, rule := range rules {
 		if ruleObj, ok := rule.(map[string]interface{}); ok {
@@ -317,12 +317,17 @@ func (v *Validate) RegisterStructValidationMapRules(rules map[string]string, typ
 // NOTE: this method is not thread-safe it is intended that these all be registered prior to any validation
 func (v *Validate) RegisterCustomTypeFunc(fn CustomTypeFunc, types ...interface{}) {
 
-	if v.customFuncs == nil {
-		v.customFuncs = make(map[reflect.Type]CustomTypeFunc)
-	}
-
 	for _, t := range types {
-		v.customFuncs[reflect.TypeOf(t)] = fn
+		var rt reflect.Type
+		switch tt := t.(type) {
+		case reflect.Type:
+			rt = tt
+		case *reflect.Type:
+			rt = *tt
+		default:
+			rt = reflect.TypeOf(t)
+		}
+		v.customFuncs.Store(rt, fn)
 	}
 
 	v.hasCustomFuncs = true

validator_test.go

@@ -2215,6 +2215,45 @@ func TestExistsValidation(t *testing.T) {
 	Equal(t, errs, nil)
 }
 
+func TestSQLValue3Validation(t *testing.T) {
+	validate := New()
+	validate.RegisterCustomTypeFunc(ValidateValuerType, reflect.TypeOf((*driver.Valuer)(nil)).Elem())
+
+	val := valuer{
+		Name: "",
+	}
+
+	errs := validate.Var(val, "required")
+	NotEqual(t, errs, nil)
+	AssertError(t, errs, "", "", "", "", "required")
+
+	val.Name = "Valid Name"
+	errs = validate.VarCtx(context.Background(), val, "required")
+	Equal(t, errs, nil)
+
+	val.Name = "errorme"
+
+	PanicMatches(t, func() { _ = validate.Var(val, "required") }, "SQL Driver Valuer error: some kind of error")
+
+	myVal := valuer{
+		Name: "",
+	}
+
+	errs = validate.Var(myVal, "required")
+	NotEqual(t, errs, nil)
+	AssertError(t, errs, "", "", "", "", "required")
+
+	intVal := sql.NullInt64{}
+	errs = validate.Var(intVal, "required")
+	NotEqual(t, errs, nil)
+	AssertError(t, errs, "", "", "", "", "required")
+
+	intVal.Int64 = 10
+	intVal.Valid = true
+	errs = validate.Var(intVal, "required")
+	Equal(t, errs, nil)
+}
+
 func TestSQLValue2Validation(t *testing.T) {
 	validate := New()
 	validate.RegisterCustomTypeFunc(ValidateValuerType, valuer{}, (*driver.Valuer)(nil), sql.NullString{}, sql.NullInt64{}, sql.NullBool{}, sql.NullFloat64{})