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customresourcedefinitions.go
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/
customresourcedefinitions.go
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// Copyright 2019 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package provider
import (
"context"
"fmt"
"github.com/juju/errors"
apiextensionsv1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1"
k8serrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
k8slabels "k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/client-go/dynamic"
"github.com/juju/juju/caas/kubernetes/provider/constants"
)
func (k *kubernetesClient) listCustomResourceDefinitions(ctx context.Context, selector k8slabels.Selector) ([]apiextensionsv1.CustomResourceDefinition, error) {
listOps := metav1.ListOptions{
LabelSelector: selector.String(),
}
list, err := k.extendedClient().ApiextensionsV1().CustomResourceDefinitions().List(ctx, listOps)
if err != nil {
return nil, errors.Trace(err)
}
if len(list.Items) == 0 {
return nil, errors.NotFoundf("custom resource definitions with selector %q", selector)
}
return list.Items, nil
}
func (k *kubernetesClient) deleteCustomResourceDefinitions(ctx context.Context, selector k8slabels.Selector) error {
err := k.extendedClient().ApiextensionsV1().CustomResourceDefinitions().DeleteCollection(ctx, metav1.DeleteOptions{
PropagationPolicy: constants.DefaultPropagationPolicy(),
}, metav1.ListOptions{
LabelSelector: selector.String(),
})
if k8serrors.IsNotFound(err) {
return nil
}
return errors.Trace(err)
}
func (k *kubernetesClient) deleteCustomResources(ctx context.Context, selectorGetter func(apiextensionsv1.CustomResourceDefinition) k8slabels.Selector) error {
crds, err := k.extendedClient().ApiextensionsV1().CustomResourceDefinitions().List(ctx, metav1.ListOptions{
// CRDs might be provisioned by another application/charm from a different model.
})
if err != nil {
return errors.Trace(err)
}
for _, crd := range crds.Items {
selector := selectorGetter(crd)
if selector.Empty() {
continue
}
for _, version := range crd.Spec.Versions {
crdClient, err := k.getCustomResourceDefinitionClient(&crd, version.Name)
if err != nil {
return errors.Trace(err)
}
err = crdClient.DeleteCollection(ctx, metav1.DeleteOptions{
PropagationPolicy: constants.DefaultPropagationPolicy(),
}, metav1.ListOptions{
LabelSelector: selector.String(),
})
if err != nil && !k8serrors.IsNotFound(err) {
return errors.Trace(err)
}
}
}
return nil
}
func (k *kubernetesClient) listCustomResources(ctx context.Context, selectorGetter func(apiextensionsv1.CustomResourceDefinition) k8slabels.Selector) (out []unstructured.Unstructured, err error) {
crds, err := k.extendedClient().ApiextensionsV1().CustomResourceDefinitions().List(ctx, metav1.ListOptions{
// CRDs might be provisioned by another application/charm from a different model.
})
if err != nil {
return nil, errors.Trace(err)
}
for _, crd := range crds.Items {
selector := selectorGetter(crd)
if selector.Empty() {
continue
}
for _, version := range crd.Spec.Versions {
crdClient, err := k.getCustomResourceDefinitionClient(&crd, version.Name)
if err != nil {
return nil, errors.Trace(err)
}
list, err := crdClient.List(ctx, metav1.ListOptions{
LabelSelector: selector.String(),
})
if err != nil && !k8serrors.IsNotFound(err) {
return nil, errors.Trace(err)
}
out = append(out, list.Items...)
}
}
if len(out) == 0 {
return nil, errors.NewNotFound(nil, "no custom resource found")
}
return out, nil
}
func isCRDScopeNamespaced(scope apiextensionsv1.ResourceScope) bool {
return scope == apiextensionsv1.NamespaceScoped
}
func (k *kubernetesClient) getCustomResourceDefinitionClient(crd *apiextensionsv1.CustomResourceDefinition, version string) (dynamic.ResourceInterface, error) {
if version == "" {
return nil, errors.NotValidf("empty version for custom resource definition %q", crd.GetName())
}
checkVersion := func() error {
for _, v := range crd.Spec.Versions {
if !v.Served {
continue
}
if version == v.Name {
return nil
}
}
return errors.NewNotValid(nil, fmt.Sprintf("custom resource definition %s %s is not a supported and served version", crd.GetName(), version))
}
if err := checkVersion(); err != nil {
return nil, errors.Trace(err)
}
client := k.dynamicClient().Resource(
schema.GroupVersionResource{
Group: crd.Spec.Group,
Version: version,
Resource: crd.Spec.Names.Plural,
},
)
if !isCRDScopeNamespaced(crd.Spec.Scope) {
return client, nil
}
if k.namespace == "" {
return nil, errNoNamespace
}
return client.Namespace(k.namespace), nil
}