/
service.go
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/
service.go
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package service
import (
"context"
"net/http"
"sync"
"time"
"github.com/forbearing/k8s/types"
"github.com/forbearing/k8s/util/client"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/client-go/discovery"
"k8s.io/client-go/dynamic"
"k8s.io/client-go/informers"
"k8s.io/client-go/informers/internalinterfaces"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/kubernetes/scheme"
"k8s.io/client-go/rest"
)
type Handler struct {
ctx context.Context
kubeconfig string
namespace string
config *rest.Config
httpClient *http.Client
restClient *rest.RESTClient
clientset *kubernetes.Clientset
dynamicClient dynamic.Interface
discoveryClient *discovery.DiscoveryClient
resyncPeriod time.Duration
informerScope string
tweakListOptions internalinterfaces.TweakListOptionsFunc
informerFactory informers.SharedInformerFactory
Options *types.HandlerOptions
l sync.RWMutex
}
// NewOrDie simply call New() to get a service handler.
// panic if there is any error occurs.
func NewOrDie(ctx context.Context, kubeconfig, namespace string) *Handler {
handler, err := New(ctx, kubeconfig, namespace)
if err != nil {
panic(err)
}
return handler
}
// New returns a Handler handler from kubeconfig or in-cluster config.
// The kubeconfig precedence is:
// * kubeconfig variable passed.
// * KUBECONFIG environment variable pointing at a file.
// * $HOME/.kube/config if exists.
// * In-cluster config if running in cluster.
func New(ctx context.Context, kubeconfig, namespace string) (*Handler, error) {
var (
err error
config *rest.Config
httpClient *http.Client
restClient *rest.RESTClient
clientset *kubernetes.Clientset
dynamicClient dynamic.Interface
discoveryClient *discovery.DiscoveryClient
informerFactory informers.SharedInformerFactory
)
// create rest config, and config precedence.
// * kubeconfig variable passed.
// * KUBECONFIG environment variable pointing at a filA.e
// * $HOME/.kube/config if exists.
// * In-cluster config if running in cluster.
if config, err = client.RESTConfig(kubeconfig); err != nil {
return nil, err
}
// setup APIPath, GroupVersion and NegotiatedSerializer before initializing a RESTClient
config.APIPath = "api"
config.GroupVersion = &corev1.SchemeGroupVersion
config.NegotiatedSerializer = scheme.Codecs
// create a http client for the given config.
if httpClient, err = rest.HTTPClientFor(config); err != nil {
return nil, err
}
// create a RESTClient for the given config and http client.
if restClient, err = rest.RESTClientForConfigAndClient(config, httpClient); err != nil {
return nil, err
}
// create a Clientset for the given config and http client.
if clientset, err = kubernetes.NewForConfigAndClient(config, httpClient); err != nil {
return nil, err
}
// create a dynamic client for the given config and http client.
if dynamicClient, err = dynamic.NewForConfigAndClient(config, httpClient); err != nil {
return nil, err
}
// create a DiscoveryClient for the given config and http client.
if discoveryClient, err = discovery.NewDiscoveryClientForConfigAndClient(config, httpClient); err != nil {
return nil, err
}
if len(namespace) == 0 {
namespace = metav1.NamespaceDefault
}
// create a sharedInformerFactory for all namespaces.
informerFactory = informers.NewSharedInformerFactory(clientset, 0)
return &Handler{
ctx: ctx,
kubeconfig: kubeconfig,
namespace: namespace,
config: config,
httpClient: httpClient,
restClient: restClient,
clientset: clientset,
dynamicClient: dynamicClient,
discoveryClient: discoveryClient,
informerFactory: informerFactory,
Options: &types.HandlerOptions{},
}, nil
}
// WithNamespace deep copies a new handler, but set the handler.namespace to
// the provided namespace.
func (h *Handler) WithNamespace(namespace string) *Handler {
handler := h.DeepCopy()
handler.ResetNamespace(namespace)
return handler
}
// WithDryRun deep copies a new handler and prints the create/update/apply/delete
// operations, without sending it to apiserver.
func (h *Handler) WithDryRun() *Handler {
svc := h.DeepCopy()
svc.Options.CreateOptions.DryRun = []string{metav1.DryRunAll}
svc.Options.UpdateOptions.DryRun = []string{metav1.DryRunAll}
svc.Options.ApplyOptions.DryRun = []string{metav1.DryRunAll}
svc.Options.PatchOptions.DryRun = []string{metav1.DryRunAll}
svc.Options.DeleteOptions.DryRun = []string{metav1.DryRunAll}
return svc
}
func (in *Handler) DeepCopy() *Handler {
if in == nil {
return nil
}
return &Handler{
ctx: in.ctx,
kubeconfig: in.kubeconfig,
namespace: in.namespace,
config: in.config,
httpClient: in.httpClient,
restClient: in.restClient,
clientset: in.clientset,
dynamicClient: in.dynamicClient,
discoveryClient: in.discoveryClient,
informerFactory: in.informerFactory,
resyncPeriod: in.resyncPeriod,
informerScope: in.informerScope,
tweakListOptions: in.tweakListOptions,
Options: &types.HandlerOptions{
CreateOptions: *in.Options.CreateOptions.DeepCopy(),
UpdateOptions: *in.Options.UpdateOptions.DeepCopy(),
ApplyOptions: *in.Options.ApplyOptions.DeepCopy(),
DeleteOptions: *in.Options.DeleteOptions.DeepCopy(),
GetOptions: *in.Options.GetOptions.DeepCopy(),
ListOptions: *in.Options.ListOptions.DeepCopy(),
PatchOptions: *in.Options.PatchOptions.DeepCopy(),
},
}
}
func (h *Handler) ResetNamespace(namespace string) {
h.l.Lock()
defer h.l.Unlock()
h.namespace = namespace
}
func (h *Handler) SetTimeout(timeout int64) {
h.l.Lock()
defer h.l.Unlock()
h.Options.ListOptions.TimeoutSeconds = &timeout
}
func (h *Handler) SetLimit(limit int64) {
h.l.Lock()
defer h.l.Unlock()
h.Options.ListOptions.Limit = limit
}
func (h *Handler) SetForceDelete(force bool) {
h.l.Lock()
defer h.l.Unlock()
if force {
h.Options.DeleteOptions.GracePeriodSeconds = new(int64)
}
}
// RESTConfig returns underlying rest config.
func (h *Handler) RESTConfig() *rest.Config {
return h.config
}
// RESTClient returns underlying rest client.
func (h *Handler) RESTClient() *rest.RESTClient {
return h.restClient
}
// Clientset returns underlying clientset.
func (h *Handler) Clientset() *kubernetes.Clientset {
return h.clientset
}
// DynamicClient returns underlying dynamic client.
func (h *Handler) DynamicClient() dynamic.Interface {
return h.dynamicClient
}
// DiscoveryClient returns underlying discovery client.
func (h *Handler) DiscoveryClient() *discovery.DiscoveryClient {
return h.discoveryClient
}
// GVK contains the Group, Version, Kind name of service.
var GVK = schema.GroupVersionKind{
Group: corev1.SchemeGroupVersion.Group,
Version: corev1.SchemeGroupVersion.Version,
Kind: types.KindService,
}
// GVR contains the Group, Version and Resource name of service.
var GVR = schema.GroupVersionResource{
Group: corev1.SchemeGroupVersion.Group,
Version: corev1.SchemeGroupVersion.Version,
Resource: types.ResourceService,
}
// Kind is the service Kind name.
var Kind = GVK.Kind
// Group is the service Group name.
var Group = GVK.Group
// Version is the service Version name.
var Version = GVK.Version
// Resource is the service Resource name.
var Resource = GVR.Resource