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dynamicrestmapper.go
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dynamicrestmapper.go
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// Copyright 2019 The Operator-SDK 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 restmapper
import (
"k8s.io/apimachinery/pkg/api/meta"
"k8s.io/apimachinery/pkg/runtime/schema"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/client-go/discovery"
"k8s.io/client-go/rest"
"k8s.io/client-go/restmapper"
)
type DynamicRESTMapper struct {
client discovery.DiscoveryInterface
delegate meta.RESTMapper
}
// NewDynamicRESTMapper returns a RESTMapper that dynamically discovers resource
// types at runtime. This is in contrast to controller-manager's default RESTMapper, which
// only checks resource types at startup, and so can't handle the case of first creating a
// CRD and then creating an instance of that CRD.
func NewDynamicRESTMapper(cfg *rest.Config) (meta.RESTMapper, error) {
client, err := discovery.NewDiscoveryClientForConfig(cfg)
if err != nil {
return nil, err
}
drm := &DynamicRESTMapper{client: client}
if err := drm.reload(); err != nil {
return nil, err
}
return drm, nil
}
func (drm *DynamicRESTMapper) reload() error {
gr, err := restmapper.GetAPIGroupResources(drm.client)
if err != nil {
return err
}
drm.delegate = restmapper.NewDiscoveryRESTMapper(gr)
return nil
}
// reloadOnError checks if an error indicates that the delegated RESTMapper needs to be
// reloaded, and if so, reloads it and returns true.
func (drm *DynamicRESTMapper) reloadOnError(err error) bool {
if _, matches := err.(*meta.NoKindMatchError); !matches {
return false
}
err = drm.reload()
if err != nil {
utilruntime.HandleError(err)
}
return err == nil
}
func (drm *DynamicRESTMapper) KindFor(resource schema.GroupVersionResource) (schema.GroupVersionKind, error) {
gvk, err := drm.delegate.KindFor(resource)
if drm.reloadOnError(err) {
gvk, err = drm.delegate.KindFor(resource)
}
return gvk, err
}
func (drm *DynamicRESTMapper) KindsFor(resource schema.GroupVersionResource) ([]schema.GroupVersionKind, error) {
gvks, err := drm.delegate.KindsFor(resource)
if drm.reloadOnError(err) {
gvks, err = drm.delegate.KindsFor(resource)
}
return gvks, err
}
func (drm *DynamicRESTMapper) ResourceFor(input schema.GroupVersionResource) (schema.GroupVersionResource, error) {
gvr, err := drm.delegate.ResourceFor(input)
if drm.reloadOnError(err) {
gvr, err = drm.delegate.ResourceFor(input)
}
return gvr, err
}
func (drm *DynamicRESTMapper) ResourcesFor(input schema.GroupVersionResource) ([]schema.GroupVersionResource, error) {
gvrs, err := drm.delegate.ResourcesFor(input)
if drm.reloadOnError(err) {
gvrs, err = drm.delegate.ResourcesFor(input)
}
return gvrs, err
}
func (drm *DynamicRESTMapper) RESTMapping(gk schema.GroupKind, versions ...string) (*meta.RESTMapping, error) {
m, err := drm.delegate.RESTMapping(gk, versions...)
if drm.reloadOnError(err) {
m, err = drm.delegate.RESTMapping(gk, versions...)
}
return m, err
}
func (drm *DynamicRESTMapper) RESTMappings(gk schema.GroupKind, versions ...string) ([]*meta.RESTMapping, error) {
ms, err := drm.delegate.RESTMappings(gk, versions...)
if drm.reloadOnError(err) {
ms, err = drm.delegate.RESTMappings(gk, versions...)
}
return ms, err
}
func (drm *DynamicRESTMapper) ResourceSingularizer(resource string) (singular string, err error) {
s, err := drm.delegate.ResourceSingularizer(resource)
if drm.reloadOnError(err) {
s, err = drm.delegate.ResourceSingularizer(resource)
}
return s, err
}