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client.go
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client.go
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/*
Copyright 2019 VMware, Inc.
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 cli
import (
"context"
"fmt"
"os"
"github.com/go-logr/logr"
"k8s.io/apimachinery/pkg/api/meta"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/client-go/discovery"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
crclient "sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/client/apiutil"
"github.com/vmware-tanzu/apps-cli-plugin/pkg/cli-runtime/printer"
)
type Client interface {
DefaultNamespace() string
KubeRestConfig() *rest.Config
Discovery() discovery.DiscoveryInterface
SetLogger(logger logr.Logger)
ToDiscoveryClient() (discovery.CachedDiscoveryInterface, error)
ToRESTConfig() (*rest.Config, error)
ToRESTMapper() (meta.RESTMapper, error)
GetClientSet() kubernetes.Interface
crclient.Client
}
func (c *client) DefaultNamespace() string {
return c.lazyLoadDefaultNamespaceOrDie()
}
func (c *client) KubeRestConfig() *rest.Config {
return c.lazyLoadRestConfigOrDie()
}
func (c *client) Discovery() discovery.DiscoveryInterface {
return c.lazyLoadKubernetesClientsetOrDie().Discovery()
}
func (c *client) Client() crclient.Client {
return c.lazyLoadClientOrDie()
}
func (c *client) ToRESTConfig() (*rest.Config, error) {
return c.KubeRestConfig(), nil
}
func (c *client) ToDiscoveryClient() (discovery.CachedDiscoveryInterface, error) {
discoveryClient := discovery.NewDiscoveryClientForConfigOrDie(c.KubeRestConfig())
return NewCacheDiscoveryClient(discoveryClient), nil
}
func (c *client) ToRESTMapper() (meta.RESTMapper, error) {
return c.RESTMapper(), nil
}
func (c *client) GetClientSet() kubernetes.Interface {
return c.lazyLoadKubernetesClientsetOrDie()
}
func (c *client) Get(ctx context.Context, key crclient.ObjectKey, obj crclient.Object, opts ...crclient.GetOption) error {
c.log.V(2).Info("API Request", "host", c.KubeRestConfig().Host, "key", key, "action", "Get")
err := c.Client().Get(ctx, key, obj, opts...)
c.log.V(2).Info("Results", "object", obj)
c.logError(err)
return err
}
func (c *client) List(ctx context.Context, list crclient.ObjectList, opts ...crclient.ListOption) error {
c.log.V(2).Info("API Request", "host", c.KubeRestConfig().Host, "action", "List")
err := c.Client().List(ctx, list, opts...)
c.log.V(2).Info("Results", "objects", list)
c.logError(err)
return err
}
func (c *client) Create(ctx context.Context, obj crclient.Object, opts ...crclient.CreateOption) error {
c.log.V(2).Info("API Request", "host", c.KubeRestConfig().Host, "action", "Create", "object", obj)
err := c.Client().Create(ctx, obj, opts...)
c.log.V(2).Info("Results", "object", obj)
c.logError(err)
return err
}
func (c *client) Delete(ctx context.Context, obj crclient.Object, opts ...crclient.DeleteOption) error {
c.log.V(2).Info("API Request", "host", c.KubeRestConfig().Host, "action", "Delete", "object", obj)
err := c.Client().Delete(ctx, obj, opts...)
c.logError(err)
return err
}
func (c *client) Update(ctx context.Context, obj crclient.Object, opts ...crclient.UpdateOption) error {
c.log.V(2).Info("API Request", "host", c.KubeRestConfig().Host, "action", "Update", "object", obj)
err := c.Client().Update(ctx, obj, opts...)
c.log.V(2).Info("Results", "object", obj)
c.logError(err)
return err
}
func (c *client) Patch(ctx context.Context, obj crclient.Object, patch crclient.Patch, opts ...crclient.PatchOption) error {
c.log.V(2).Info("API Request", "host", c.KubeRestConfig().Host, "action", "Patch", "data", patch)
err := c.Client().Patch(ctx, obj, patch, opts...)
c.log.V(2).Info("Results", "object", obj)
c.logError(err)
return err
}
func (c *client) DeleteAllOf(ctx context.Context, obj crclient.Object, opts ...crclient.DeleteAllOfOption) error {
c.log.V(2).Info("API Request", "host", c.KubeRestConfig().Host, "action", "DeleteAllOf")
err := c.Client().DeleteAllOf(ctx, obj, opts...)
c.log.V(2).Info("Results", "object", obj)
c.logError(err)
return err
}
func (c *client) logError(err error) {
if err != nil && c.log.V(2).Enabled() {
c.log.V(2).Error(err, "API Error")
}
}
func (c *client) Status() crclient.StatusWriter {
panic(fmt.Errorf("not implemented"))
}
func (c *client) Scheme() *runtime.Scheme {
return c.Client().Scheme()
}
func (c *client) RESTMapper() meta.RESTMapper {
return c.Client().RESTMapper()
}
func (c *client) SetLogger(logger logr.Logger) {
c.log = logger
}
func NewClient(kubeConfigFile string, currentContext string, scheme *runtime.Scheme) Client {
return &client{
kubeConfigFile: kubeConfigFile,
currentContext: currentContext,
scheme: scheme,
log: logr.Discard(),
}
}
type client struct {
defaultNamespace string
kubeConfigFile string
currentContext string
scheme *runtime.Scheme
kubeConfig clientcmd.ClientConfig
restConfig *rest.Config
kubeClientset *kubernetes.Clientset
client crclient.Client
log logr.Logger
}
func (c *client) lazyLoadKubeConfig() clientcmd.ClientConfig {
if c.kubeConfig == nil {
loadingRules := clientcmd.NewDefaultClientConfigLoadingRules()
loadingRules.ExplicitPath = c.kubeConfigFile
configOverrides := &clientcmd.ConfigOverrides{
CurrentContext: c.currentContext,
}
c.kubeConfig = clientcmd.NewNonInteractiveDeferredLoadingClientConfig(loadingRules, configOverrides)
}
return c.kubeConfig
}
func (c *client) lazyLoadRestConfigOrDie() *rest.Config {
if c.restConfig == nil {
kubeConfig := c.lazyLoadKubeConfig()
restConfig, err := kubeConfig.ClientConfig()
if err != nil {
if clientcmd.IsEmptyConfig(err) {
fmt.Printf("%s Unable to connect: no configuration has been found. If a kubeconfig is not set, it can be provided with the --kubeconfig flag or KUBECONFIG environment variable.\n", printer.Serrorf("Error:"))
} else {
fmt.Printf("%s %v \n", printer.Serrorf("Error:"), err)
}
c.logError(err)
os.Exit(2)
}
c.restConfig = restConfig
}
return c.restConfig
}
func (c *client) lazyLoadKubernetesClientsetOrDie() *kubernetes.Clientset {
if c.kubeClientset == nil {
restConfig := c.lazyLoadRestConfigOrDie()
c.kubeClientset = kubernetes.NewForConfigOrDie(restConfig)
}
return c.kubeClientset
}
func (c *client) lazyLoadClientOrDie() crclient.Client {
if c.client == nil {
restConfig := c.lazyLoadRestConfigOrDie()
lazyLoadMapper, err := apiutil.NewDynamicRESTMapper(c.KubeRestConfig(), apiutil.WithExperimentalLazyMapper)
if err != nil {
fmt.Printf("%s Unable to create rest mapper. signk8s.io/dynamicrestmapper states %s \n", printer.Serrorf("Error:"), err)
c.logError(err)
os.Exit(2)
}
client, err := crclient.New(restConfig, crclient.Options{Scheme: c.scheme, Mapper: lazyLoadMapper})
if err != nil {
fmt.Printf("%s Unable to connect: connection refused. Confirm kubeconfig details and try again.\n", printer.Serrorf("Error:"))
c.logError(err)
os.Exit(2)
}
c.client = client
}
return c.client
}
func (c *client) lazyLoadDefaultNamespaceOrDie() string {
if c.defaultNamespace == "" {
kubeConfig := c.lazyLoadKubeConfig()
namespace, _, err := kubeConfig.Namespace()
if err != nil {
if clientcmd.IsEmptyConfig(err) {
fmt.Printf("%s Unable to connect: no configuration has been found. If a kubeconfig is not set, it can be provided with the --kubeconfig flag or KUBECONFIG environment variable.\n", printer.Serrorf("Error:"))
} else {
fmt.Printf("%s %v \n", printer.Serrorf("Error:"), err)
}
c.logError(err)
os.Exit(2)
}
c.defaultNamespace = namespace
}
return c.defaultNamespace
}
func (c *client) SubResource(subResource string) crclient.SubResourceClient {
return c.Client().SubResource(subResource)
}
var _ discovery.CachedDiscoveryInterface = &cachedDiscoveryClient{}
type cachedDiscoveryClient struct {
*discovery.DiscoveryClient
}
func (d *cachedDiscoveryClient) Fresh() bool {
return true
}
func (d *cachedDiscoveryClient) Invalidate() {}
func NewCacheDiscoveryClient(discoveryClient *discovery.DiscoveryClient) *cachedDiscoveryClient {
return &cachedDiscoveryClient{discoveryClient}
}