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/*
Copyright 2018 Intel Corporation.
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 app
import (
"log"
"os"
"time"
"k8splugin/internal/config"
"k8splugin/internal/connection"
"k8splugin/internal/helm"
"k8splugin/internal/plugin"
pkgerrors "github.com/pkg/errors"
"k8s.io/apimachinery/pkg/api/meta"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/client-go/discovery"
"k8s.io/client-go/dynamic"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/restmapper"
"k8s.io/client-go/tools/clientcmd"
)
// KubernetesClient encapsulates the different clients' interfaces
// we need when interacting with a Kubernetes cluster
type KubernetesClient struct {
clientSet kubernetes.Interface
dynamicClient dynamic.Interface
discoverClient discovery.CachedDiscoveryInterface
restMapper meta.RESTMapper
}
// getKubeConfig uses the connectivity client to get the kubeconfig based on the name
// of the cloudregion. This is written out to a file.
func (k *KubernetesClient) getKubeConfig(cloudregion string) (string, error) {
conn := connection.NewConnectionClient()
kubeConfigPath, err := conn.Download(cloudregion, config.GetConfiguration().KubeConfigDir)
if err != nil {
return "", pkgerrors.Wrap(err, "Downloading kubeconfig")
}
return kubeConfigPath, nil
}
// init loads the Kubernetes configuation values stored into the local configuration file
func (k *KubernetesClient) init(cloudregion string) error {
if cloudregion == "" {
return pkgerrors.New("Cloudregion is empty")
}
configPath, err := k.getKubeConfig(cloudregion)
if err != nil {
return pkgerrors.Wrap(err, "Get kubeconfig file")
}
//Remove kubeconfigfile after the clients are created
defer os.Remove(configPath)
config, err := clientcmd.BuildConfigFromFlags("", configPath)
if err != nil {
return pkgerrors.Wrap(err, "setConfig: Build config from flags raised an error")
}
k.clientSet, err = kubernetes.NewForConfig(config)
if err != nil {
return err
}
k.dynamicClient, err = dynamic.NewForConfig(config)
if err != nil {
return pkgerrors.Wrap(err, "Creating dynamic client")
}
k.discoverClient, err = discovery.NewCachedDiscoveryClientForConfig(config, os.TempDir(), "", 10*time.Minute)
if err != nil {
return pkgerrors.Wrap(err, "Creating discovery client")
}
k.restMapper = restmapper.NewDeferredDiscoveryRESTMapper(k.discoverClient)
return nil
}
func (k *KubernetesClient) ensureNamespace(namespace string) error {
pluginImpl, err := plugin.GetPluginByKind("Namespace")
if err != nil {
return pkgerrors.Wrap(err, "Loading Namespace Plugin")
}
ns, err := pluginImpl.Get(helm.KubernetesResource{
Name: namespace,
GVK: schema.GroupVersionKind{
Group: "",
Version: "v1",
Kind: "Namespace",
},
}, namespace, k)
if ns == "" {
log.Println("Creating " + namespace + " namespace")
_, err = pluginImpl.Create("", namespace, k)
if err != nil {
return pkgerrors.Wrap(err, "Error creating "+namespace+" namespace")
}
}
return nil
}
func (k *KubernetesClient) createKind(resTempl helm.KubernetesResourceTemplate,
namespace string) (helm.KubernetesResource, error) {
log.Println("Processing Kind: " + resTempl.GVK.Kind)
if _, err := os.Stat(resTempl.FilePath); os.IsNotExist(err) {
return helm.KubernetesResource{}, pkgerrors.New("File " + resTempl.FilePath + "does not exists")
}
log.Println("Processing file: " + resTempl.FilePath)
pluginImpl, err := plugin.GetPluginByKind(resTempl.GVK.Kind)
if err != nil {
return helm.KubernetesResource{}, pkgerrors.Wrap(err, "Error loading plugin")
}
createdResourceName, err := pluginImpl.Create(resTempl.FilePath, namespace, k)
if err != nil {
return helm.KubernetesResource{}, pkgerrors.Wrap(err, "Error in plugin "+resTempl.GVK.Kind+" plugin")
}
log.Print(createdResourceName + " created")
return helm.KubernetesResource{
GVK: resTempl.GVK,
Name: createdResourceName,
}, nil
}
func (k *KubernetesClient) createResources(sortedTemplates []helm.KubernetesResourceTemplate,
namespace string) ([]helm.KubernetesResource, error) {
err := k.ensureNamespace(namespace)
if err != nil {
return nil, pkgerrors.Wrap(err, "Creating Namespace")
}
var createdResources []helm.KubernetesResource
for _, resTempl := range sortedTemplates {
resCreated, err := k.createKind(resTempl, namespace)
if err != nil {
return nil, pkgerrors.Wrapf(err, "Error creating kind: %+v", resTempl.GVK)
}
createdResources = append(createdResources, resCreated)
}
return createdResources, nil
}
func (k *KubernetesClient) deleteKind(resource helm.KubernetesResource, namespace string) error {
log.Println("Deleting Kind: " + resource.GVK.Kind)
pluginImpl, err := plugin.GetPluginByKind(resource.GVK.Kind)
if err != nil {
return pkgerrors.Wrap(err, "Error loading plugin")
}
log.Println("Deleting resource: " + resource.Name)
err = pluginImpl.Delete(resource, namespace, k)
if err != nil {
return pkgerrors.Wrap(err, "Error deleting "+resource.Name)
}
return nil
}
func (k *KubernetesClient) deleteResources(resources []helm.KubernetesResource, namespace string) error {
//TODO: Investigate if deletion should be in a particular order
for _, res := range resources {
err := k.deleteKind(res, namespace)
if err != nil {
return pkgerrors.Wrap(err, "Deleting resources")
}
}
return nil
}
//GetMapper returns the RESTMapper that was created for this client
func (k *KubernetesClient) GetMapper() meta.RESTMapper {
return k.restMapper
}
//GetDynamicClient returns the dynamic client that is needed for
//unstructured REST calls to the apiserver
func (k *KubernetesClient) GetDynamicClient() dynamic.Interface {
return k.dynamicClient
}
// GetStandardClient returns the standard client that can be used to handle
// standard kubernetes kinds
func (k *KubernetesClient) GetStandardClient() kubernetes.Interface {
return k.clientSet
}
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