forked from knative/eventing
/
bus.go
77 lines (67 loc) · 2.05 KB
/
bus.go
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/*
* Copyright 2018 The Knative Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package webhook
import (
"context"
"errors"
"github.com/golang/glog"
"github.com/knative/eventing/pkg/apis/channels/v1alpha1"
"github.com/mattbaird/jsonpatch"
)
var (
errInvalidBusInput = errors.New("failed to convert input into Bus or ClusterBus")
errInternalNilBus = errors.New("unexpected internal error: nil Bus or ClusterBus")
)
// ValidateBus is Bus resource specific validation and mutation handler
func ValidateBus(ctx context.Context) ResourceCallback {
return func(patches *[]jsonpatch.JsonPatchOperation, old GenericCRD, new GenericCRD) error {
oldBus, newBus, err := unmarshalBuses(ctx, old, new, "ValidateBus")
if err != nil {
return err
}
return validateBus(oldBus, newBus)
}
}
func validateBus(old, new v1alpha1.GenericBus) error {
if err := new.Validate(); err != nil {
return err
}
if err := new.CheckImmutableFields(old); err != nil {
return err
}
return nil
}
func unmarshalBuses(
ctx context.Context, old, new GenericCRD, fnName string) (v1alpha1.GenericBus, v1alpha1.GenericBus, error) {
var oldBus v1alpha1.GenericBus
if old != nil {
var ok bool
oldBus, ok = old.(v1alpha1.GenericBus)
if !ok {
return nil, nil, errInvalidBusInput
}
}
glog.Infof("%s: OLD Bus is\n%+v", fnName, oldBus)
if new == nil {
return nil, nil, errInternalNilBus
}
newBus, ok := new.(v1alpha1.GenericBus)
if !ok {
return nil, nil, errInvalidBusInput
}
glog.Infof("%s: NEW Bus is\n%+v", fnName, newBus)
return oldBus, newBus, nil
}