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crd.go
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crd.go
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/**
* Copyright © 2014-2020 The SiteWhere 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 resources
import (
"context"
"fmt"
"io/ioutil"
"net/http"
discovery "k8s.io/client-go/discovery"
memory "k8s.io/client-go/discovery/cached/memory"
dynamic "k8s.io/client-go/dynamic"
rest "k8s.io/client-go/rest"
restmapper "k8s.io/client-go/restmapper"
apiextv1beta1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1beta1"
apiextensionsclientset "k8s.io/apiextensions-apiserver/pkg/client/clientset/clientset"
"k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/api/meta"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)
// CreateCustomResourceDefinitionIfNotExists Create a CustomResourceDefinition if it does not exists.
func CreateCustomResourceDefinitionIfNotExists(crd *apiextv1beta1.CustomResourceDefinition, apiextensionsclientset apiextensionsclientset.Interface) (*apiextv1beta1.CustomResourceDefinition, error) {
var err error
crds := apiextensionsclientset.ApiextensionsV1beta1().CustomResourceDefinitions()
_, err = crds.Create(context.TODO(), crd, metav1.CreateOptions{})
if err != nil {
if !errors.IsAlreadyExists(err) {
return nil, err
}
}
return crd, nil
}
// DeleteCustomResourceDefinitionIfExists Delete a CustomResourceDefinition if it exists
func DeleteCustomResourceDefinitionIfExists(crd *apiextv1beta1.CustomResourceDefinition, apiextensionsclientset apiextensionsclientset.Interface) error {
return apiextensionsclientset.ApiextensionsV1beta1().CustomResourceDefinitions().Delete(
context.TODO(),
crd.ObjectMeta.Name,
metav1.DeleteOptions{})
}
// CreateCustomResourceFromFile Reads a File from statik and creates a CustomResource from it.
func CreateCustomResourceFromFile(crName string, statikFS http.FileSystem, config *rest.Config) error {
r, err := statikFS.Open(crName)
if err != nil {
fmt.Printf("Error reading %s: %v\n", crName, err)
return err
}
defer r.Close()
contents, err := ioutil.ReadAll(r)
if err != nil {
fmt.Printf("Error reading content of %s: %v\n", crName, err)
return err
}
// 1. Prepare a RESTMapper to find GVR
dc, err := discovery.NewDiscoveryClientForConfig(config)
if err != nil {
fmt.Printf("Error getting NewDiscoveryClientForConfig for %s: %v\n", crName, err)
return err
}
mapper := restmapper.NewDeferredDiscoveryRESTMapper(memory.NewMemCacheClient(dc))
// 2. Prepare the dynamic client
dyn, err := dynamic.NewForConfig(config)
if err != nil {
fmt.Printf("Error getting NewForConfig for %s: %v\n", crName, err)
return err
}
// 3. Decode YAML manifest into unstructured.Unstructured
obj := &unstructured.Unstructured{}
_, gvk, err := decUnstructured.Decode([]byte(contents), nil, obj)
if err != nil {
fmt.Printf("Error decoding for %s: %v\n", crName, err)
return err
}
// 4. Find GVR
mapping, err := mapper.RESTMapping(gvk.GroupKind(), gvk.Version)
if err != nil {
fmt.Printf("Error finding GRV for %s: %v\n", crName, err)
return err
}
// 5. Obtain REST interface for the GVR
var dr dynamic.ResourceInterface
if mapping.Scope.Name() == meta.RESTScopeNameNamespace {
// namespaced resources should specify the namespace
dr = dyn.Resource(mapping.Resource).Namespace(obj.GetNamespace())
} else {
// for cluster-wide resources
dr = dyn.Resource(mapping.Resource)
}
_, err = dr.Create(context.TODO(), obj, metav1.CreateOptions{})
if err != nil {
if !errors.IsAlreadyExists(err) {
fmt.Printf("Error creating resource from file %s of Kind: %s: %v", crName, gvk.GroupKind().Kind, err)
}
return err
}
return nil
}
// DeleteCustomResourceFromFile Reads a File from statik and deletes a CustomResource from it.
func DeleteCustomResourceFromFile(crName string, config *rest.Config, statikFS http.FileSystem) error {
r, err := statikFS.Open(crName)
if err != nil {
fmt.Printf("Error reading %s: %v\n", crName, err)
return err
}
defer r.Close()
contents, err := ioutil.ReadAll(r)
if err != nil {
fmt.Printf("Error reading content: %v\n", err)
return err
}
// 1. Prepare a RESTMapper to find GVR
dc, err := discovery.NewDiscoveryClientForConfig(config)
if err != nil {
fmt.Printf("Error getting NewDiscoveryClientForConfig: %v\n", err)
return err
}
mapper := restmapper.NewDeferredDiscoveryRESTMapper(memory.NewMemCacheClient(dc))
// 2. Prepare the dynamic client
dyn, err := dynamic.NewForConfig(config)
if err != nil {
fmt.Printf("Error getting NewForConfig: %v\n", err)
return err
}
// 3. Decode YAML manifest into unstructured.Unstructured
obj := &unstructured.Unstructured{}
_, gvk, err := decUnstructured.Decode([]byte(contents), nil, obj)
if err != nil {
fmt.Printf("Error decoding: %v\n", err)
return err
}
// 4. Find GVR
mapping, err := mapper.RESTMapping(gvk.GroupKind(), gvk.Version)
if err != nil {
return err
}
// 5. Obtain REST interface for the GVR
var dr dynamic.ResourceInterface
if mapping.Scope.Name() == meta.RESTScopeNameNamespace {
// namespaced resources should specify the namespace
dr = dyn.Resource(mapping.Resource).Namespace(obj.GetNamespace())
} else {
// for cluster-wide resources
dr = dyn.Resource(mapping.Resource)
}
err = dr.Delete(context.TODO(), obj.GetName(), metav1.DeleteOptions{})
if err != nil && !errors.IsNotFound(err) {
fmt.Printf("Error deleting resource from file %s of Kind: %s: %v", crName, gvk.GroupKind().Kind, err)
return err
}
return nil
}