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wrapper.go
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wrapper.go
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package validation
import (
"fmt"
"reflect"
"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
"github.com/GoogleCloudPlatform/kubernetes/pkg/util/fielderrors"
)
type WrappingValidator struct {
validate *reflect.Value
validateUpdate *reflect.Value
}
func (v *WrappingValidator) Validate(obj runtime.Object) fielderrors.ValidationErrorList {
return callValidate(reflect.ValueOf(obj), *v.validate)
}
func (v *WrappingValidator) ValidateUpdate(obj, old runtime.Object) fielderrors.ValidationErrorList {
if v.validateUpdate == nil {
// if there is no update validation, fail.
return fielderrors.ValidationErrorList{fielderrors.NewFieldForbidden("obj", obj)}
}
return callValidateUpdate(reflect.ValueOf(obj), reflect.ValueOf(old), *v.validateUpdate)
}
func NewValidationWrapper(validateFunction interface{}, validateUpdateFunction interface{}) (*WrappingValidator, error) {
validateFunctionValue := reflect.ValueOf(validateFunction)
validateType := validateFunctionValue.Type()
if err := verifyValidateFunctionSignature(validateType); err != nil {
return nil, err
}
var validateUpdateFunctionValue *reflect.Value
if validateUpdateFunction != nil {
functionValue := reflect.ValueOf(validateUpdateFunction)
validateUpdateType := functionValue.Type()
if err := verifyValidateUpdateFunctionSignature(validateUpdateType); err != nil {
return nil, err
}
validateUpdateFunctionValue = &functionValue
}
return &WrappingValidator{&validateFunctionValue, validateUpdateFunctionValue}, nil
}
func verifyValidateFunctionSignature(ft reflect.Type) error {
if ft.Kind() != reflect.Func {
return fmt.Errorf("expected func, got: %v", ft)
}
if ft.NumIn() != 1 {
return fmt.Errorf("expected one 'in' param, got: %v", ft)
}
if ft.NumOut() != 1 {
return fmt.Errorf("expected one 'out' param, got: %v", ft)
}
if ft.In(0).Kind() != reflect.Ptr {
return fmt.Errorf("expected pointer arg for 'in' param 0, got: %v", ft)
}
errorType := reflect.TypeOf(&fielderrors.ValidationErrorList{}).Elem()
if ft.Out(0) != errorType {
return fmt.Errorf("expected fielderrors.ValidationErrorList return, got: %v", ft)
}
return nil
}
func verifyValidateUpdateFunctionSignature(ft reflect.Type) error {
if ft.Kind() != reflect.Func {
return fmt.Errorf("expected func, got: %v", ft)
}
if ft.NumIn() != 2 {
return fmt.Errorf("expected two 'in' params, got: %v", ft)
}
if ft.NumOut() != 1 {
return fmt.Errorf("expected one 'out' param, got: %v", ft)
}
if ft.In(0).Kind() != reflect.Ptr {
return fmt.Errorf("expected pointer arg for 'in' param 0, got: %v", ft)
}
if ft.In(1).Kind() != reflect.Ptr {
return fmt.Errorf("expected pointer arg for 'in' param 1, got: %v", ft)
}
errorType := reflect.TypeOf(&fielderrors.ValidationErrorList{}).Elem()
if ft.Out(0) != errorType {
return fmt.Errorf("expected fielderrors.ValidationErrorList return, got: %v", ft)
}
return nil
}
// callCustom calls 'custom' with sv & dv. custom must be a conversion function.
func callValidate(obj, validateMethod reflect.Value) fielderrors.ValidationErrorList {
args := []reflect.Value{obj}
ret := validateMethod.Call(args)[0].Interface()
// This convolution is necessary because nil interfaces won't convert
// to errors.
if ret == nil {
return nil
}
return ret.(fielderrors.ValidationErrorList)
}
func callValidateUpdate(obj, old, validateMethod reflect.Value) fielderrors.ValidationErrorList {
args := []reflect.Value{obj, old}
ret := validateMethod.Call(args)[0].Interface()
// This convolution is necessary because nil interfaces won't convert
// to errors.
if ret == nil {
return nil
}
return ret.(fielderrors.ValidationErrorList)
}