traefik/pkg/provider/kubernetes/crd/client.go

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package crd
import (
"errors"
"fmt"
"os"
"path/filepath"
"runtime"
"time"
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"github.com/rs/zerolog/log"
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"github.com/traefik/traefik/v3/pkg/provider/kubernetes/crd/generated/clientset/versioned"
"github.com/traefik/traefik/v3/pkg/provider/kubernetes/crd/generated/informers/externalversions"
"github.com/traefik/traefik/v3/pkg/provider/kubernetes/crd/traefik/v1alpha1"
"github.com/traefik/traefik/v3/pkg/provider/kubernetes/k8s"
"github.com/traefik/traefik/v3/pkg/version"
corev1 "k8s.io/api/core/v1"
kubeerror "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/client-go/informers"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
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"k8s.io/client-go/tools/clientcmd"
)
const resyncPeriod = 10 * time.Minute
// Client is a client for the Provider master.
// WatchAll starts the watch of the Provider resources and updates the stores.
// The stores can then be accessed via the Get* functions.
type Client interface {
WatchAll(namespaces []string, stopCh <-chan struct{}) (<-chan interface{}, error)
GetIngressRoutes() []*v1alpha1.IngressRoute
GetIngressRouteTCPs() []*v1alpha1.IngressRouteTCP
GetIngressRouteUDPs() []*v1alpha1.IngressRouteUDP
GetMiddlewares() []*v1alpha1.Middleware
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GetMiddlewareTCPs() []*v1alpha1.MiddlewareTCP
GetTraefikService(namespace, name string) (*v1alpha1.TraefikService, bool, error)
GetTraefikServices() []*v1alpha1.TraefikService
GetTLSOptions() []*v1alpha1.TLSOption
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GetServersTransports() []*v1alpha1.ServersTransport
GetServersTransportTCPs() []*v1alpha1.ServersTransportTCP
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GetTLSStores() []*v1alpha1.TLSStore
GetService(namespace, name string) (*corev1.Service, bool, error)
GetSecret(namespace, name string) (*corev1.Secret, bool, error)
GetEndpoints(namespace, name string) (*corev1.Endpoints, bool, error)
}
// TODO: add tests for the clientWrapper (and its methods) itself.
type clientWrapper struct {
csCrd versioned.Interface
csKube kubernetes.Interface
factoriesCrd map[string]externalversions.SharedInformerFactory
factoriesKube map[string]informers.SharedInformerFactory
factoriesSecret map[string]informers.SharedInformerFactory
labelSelector string
isNamespaceAll bool
watchedNamespaces []string
}
func createClientFromConfig(c *rest.Config) (*clientWrapper, error) {
c.UserAgent = fmt.Sprintf(
"%s/%s (%s/%s) kubernetes/crd",
filepath.Base(os.Args[0]),
version.Version,
runtime.GOOS,
runtime.GOARCH,
)
csCrd, err := versioned.NewForConfig(c)
if err != nil {
return nil, err
}
csKube, err := kubernetes.NewForConfig(c)
if err != nil {
return nil, err
}
return newClientImpl(csKube, csCrd), nil
}
func newClientImpl(csKube kubernetes.Interface, csCrd versioned.Interface) *clientWrapper {
return &clientWrapper{
csCrd: csCrd,
csKube: csKube,
factoriesCrd: make(map[string]externalversions.SharedInformerFactory),
factoriesKube: make(map[string]informers.SharedInformerFactory),
factoriesSecret: make(map[string]informers.SharedInformerFactory),
}
}
// newInClusterClient returns a new Provider client that is expected to run
// inside the cluster.
func newInClusterClient(endpoint string) (*clientWrapper, error) {
config, err := rest.InClusterConfig()
if err != nil {
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return nil, fmt.Errorf("failed to create in-cluster configuration: %w", err)
}
if endpoint != "" {
config.Host = endpoint
}
return createClientFromConfig(config)
}
func newExternalClusterClientFromFile(file string) (*clientWrapper, error) {
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configFromFlags, err := clientcmd.BuildConfigFromFlags("", file)
if err != nil {
return nil, err
}
return createClientFromConfig(configFromFlags)
}
// newExternalClusterClient returns a new Provider client that may run outside
// of the cluster.
// The endpoint parameter must not be empty.
func newExternalClusterClient(endpoint, token, caFilePath string) (*clientWrapper, error) {
if endpoint == "" {
return nil, errors.New("endpoint missing for external cluster client")
}
config := &rest.Config{
Host: endpoint,
BearerToken: token,
}
if caFilePath != "" {
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caData, err := os.ReadFile(caFilePath)
if err != nil {
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return nil, fmt.Errorf("failed to read CA file %s: %w", caFilePath, err)
}
config.TLSClientConfig = rest.TLSClientConfig{CAData: caData}
}
return createClientFromConfig(config)
}
// WatchAll starts namespace-specific controllers for all relevant kinds.
func (c *clientWrapper) WatchAll(namespaces []string, stopCh <-chan struct{}) (<-chan interface{}, error) {
eventCh := make(chan interface{}, 1)
eventHandler := &k8s.ResourceEventHandler{Ev: eventCh}
if len(namespaces) == 0 {
namespaces = []string{metav1.NamespaceAll}
c.isNamespaceAll = true
}
c.watchedNamespaces = namespaces
notOwnedByHelm := func(opts *metav1.ListOptions) {
opts.LabelSelector = "owner!=helm"
}
matchesLabelSelector := func(opts *metav1.ListOptions) {
opts.LabelSelector = c.labelSelector
}
for _, ns := range namespaces {
factoryCrd := externalversions.NewSharedInformerFactoryWithOptions(c.csCrd, resyncPeriod, externalversions.WithNamespace(ns), externalversions.WithTweakListOptions(matchesLabelSelector))
factoryCrd.Traefik().V1alpha1().IngressRoutes().Informer().AddEventHandler(eventHandler)
factoryCrd.Traefik().V1alpha1().Middlewares().Informer().AddEventHandler(eventHandler)
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factoryCrd.Traefik().V1alpha1().MiddlewareTCPs().Informer().AddEventHandler(eventHandler)
factoryCrd.Traefik().V1alpha1().IngressRouteTCPs().Informer().AddEventHandler(eventHandler)
factoryCrd.Traefik().V1alpha1().IngressRouteUDPs().Informer().AddEventHandler(eventHandler)
factoryCrd.Traefik().V1alpha1().TLSOptions().Informer().AddEventHandler(eventHandler)
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factoryCrd.Traefik().V1alpha1().ServersTransports().Informer().AddEventHandler(eventHandler)
factoryCrd.Traefik().V1alpha1().ServersTransportTCPs().Informer().AddEventHandler(eventHandler)
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factoryCrd.Traefik().V1alpha1().TLSStores().Informer().AddEventHandler(eventHandler)
factoryCrd.Traefik().V1alpha1().TraefikServices().Informer().AddEventHandler(eventHandler)
factoryKube := informers.NewSharedInformerFactoryWithOptions(c.csKube, resyncPeriod, informers.WithNamespace(ns))
factoryKube.Core().V1().Services().Informer().AddEventHandler(eventHandler)
factoryKube.Core().V1().Endpoints().Informer().AddEventHandler(eventHandler)
factorySecret := informers.NewSharedInformerFactoryWithOptions(c.csKube, resyncPeriod, informers.WithNamespace(ns), informers.WithTweakListOptions(notOwnedByHelm))
factorySecret.Core().V1().Secrets().Informer().AddEventHandler(eventHandler)
c.factoriesCrd[ns] = factoryCrd
c.factoriesKube[ns] = factoryKube
c.factoriesSecret[ns] = factorySecret
}
for _, ns := range namespaces {
c.factoriesCrd[ns].Start(stopCh)
c.factoriesKube[ns].Start(stopCh)
c.factoriesSecret[ns].Start(stopCh)
}
for _, ns := range namespaces {
for t, ok := range c.factoriesCrd[ns].WaitForCacheSync(stopCh) {
if !ok {
return nil, fmt.Errorf("timed out waiting for controller caches to sync %s in namespace %q", t.String(), ns)
}
}
for t, ok := range c.factoriesKube[ns].WaitForCacheSync(stopCh) {
if !ok {
return nil, fmt.Errorf("timed out waiting for controller caches to sync %s in namespace %q", t.String(), ns)
}
}
for t, ok := range c.factoriesSecret[ns].WaitForCacheSync(stopCh) {
if !ok {
return nil, fmt.Errorf("timed out waiting for controller caches to sync %s in namespace %q", t.String(), ns)
}
}
}
return eventCh, nil
}
func (c *clientWrapper) GetIngressRoutes() []*v1alpha1.IngressRoute {
var result []*v1alpha1.IngressRoute
for ns, factory := range c.factoriesCrd {
ings, err := factory.Traefik().V1alpha1().IngressRoutes().Lister().List(labels.Everything())
if err != nil {
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log.Error().Err(err).Msgf("Failed to list ingress routes in namespace %s", ns)
}
result = append(result, ings...)
}
return result
}
func (c *clientWrapper) GetIngressRouteTCPs() []*v1alpha1.IngressRouteTCP {
var result []*v1alpha1.IngressRouteTCP
for ns, factory := range c.factoriesCrd {
ings, err := factory.Traefik().V1alpha1().IngressRouteTCPs().Lister().List(labels.Everything())
if err != nil {
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log.Error().Err(err).Msgf("Failed to list tcp ingress routes in namespace %s", ns)
}
result = append(result, ings...)
}
return result
}
func (c *clientWrapper) GetIngressRouteUDPs() []*v1alpha1.IngressRouteUDP {
var result []*v1alpha1.IngressRouteUDP
for ns, factory := range c.factoriesCrd {
ings, err := factory.Traefik().V1alpha1().IngressRouteUDPs().Lister().List(labels.Everything())
if err != nil {
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log.Error().Err(err).Msgf("Failed to list udp ingress routes in namespace %s", ns)
}
result = append(result, ings...)
}
return result
}
func (c *clientWrapper) GetMiddlewares() []*v1alpha1.Middleware {
var result []*v1alpha1.Middleware
for ns, factory := range c.factoriesCrd {
middlewares, err := factory.Traefik().V1alpha1().Middlewares().Lister().List(labels.Everything())
if err != nil {
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log.Error().Err(err).Msgf("Failed to list middlewares in namespace %s", ns)
}
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result = append(result, middlewares...)
}
return result
}
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func (c *clientWrapper) GetMiddlewareTCPs() []*v1alpha1.MiddlewareTCP {
var result []*v1alpha1.MiddlewareTCP
for ns, factory := range c.factoriesCrd {
middlewares, err := factory.Traefik().V1alpha1().MiddlewareTCPs().Lister().List(labels.Everything())
if err != nil {
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log.Error().Err(err).Msgf("Failed to list TCP middlewares in namespace %s", ns)
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}
result = append(result, middlewares...)
}
return result
}
// GetTraefikService returns the named service from the given namespace.
func (c *clientWrapper) GetTraefikService(namespace, name string) (*v1alpha1.TraefikService, bool, error) {
if !c.isWatchedNamespace(namespace) {
return nil, false, fmt.Errorf("failed to get service %s/%s: namespace is not within watched namespaces", namespace, name)
}
service, err := c.factoriesCrd[c.lookupNamespace(namespace)].Traefik().V1alpha1().TraefikServices().Lister().TraefikServices(namespace).Get(name)
exist, err := translateNotFoundError(err)
return service, exist, err
}
func (c *clientWrapper) GetTraefikServices() []*v1alpha1.TraefikService {
var result []*v1alpha1.TraefikService
for ns, factory := range c.factoriesCrd {
ings, err := factory.Traefik().V1alpha1().TraefikServices().Lister().List(labels.Everything())
if err != nil {
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log.Error().Err(err).Msgf("Failed to list Traefik services in namespace %s", ns)
}
result = append(result, ings...)
}
return result
}
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// GetServersTransports returns all ServersTransport.
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func (c *clientWrapper) GetServersTransports() []*v1alpha1.ServersTransport {
var result []*v1alpha1.ServersTransport
for ns, factory := range c.factoriesCrd {
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serversTransports, err := factory.Traefik().V1alpha1().ServersTransports().Lister().List(labels.Everything())
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if err != nil {
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log.Error().Err(err).Msgf("Failed to list servers transport in namespace %s", ns)
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}
result = append(result, serversTransports...)
}
return result
}
// GetServersTransportTCPs returns all ServersTransportTCP.
func (c *clientWrapper) GetServersTransportTCPs() []*v1alpha1.ServersTransportTCP {
var result []*v1alpha1.ServersTransportTCP
for ns, factory := range c.factoriesCrd {
serversTransports, err := factory.Traefik().V1alpha1().ServersTransportTCPs().Lister().List(labels.Everything())
if err != nil {
log.Error().
Err(err).
Str("namespace", ns).
Msg("Failed to list servers transport TCP in namespace")
}
result = append(result, serversTransports...)
}
return result
}
// GetTLSOptions returns all TLS options.
func (c *clientWrapper) GetTLSOptions() []*v1alpha1.TLSOption {
var result []*v1alpha1.TLSOption
for ns, factory := range c.factoriesCrd {
options, err := factory.Traefik().V1alpha1().TLSOptions().Lister().List(labels.Everything())
if err != nil {
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log.Error().Err(err).Msgf("Failed to list tls options in namespace %s", ns)
}
result = append(result, options...)
}
return result
}
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// GetTLSStores returns all TLS stores.
func (c *clientWrapper) GetTLSStores() []*v1alpha1.TLSStore {
var result []*v1alpha1.TLSStore
for ns, factory := range c.factoriesCrd {
stores, err := factory.Traefik().V1alpha1().TLSStores().Lister().List(labels.Everything())
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if err != nil {
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log.Error().Err(err).Msgf("Failed to list tls stores in namespace %s", ns)
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}
result = append(result, stores...)
}
return result
}
// GetService returns the named service from the given namespace.
func (c *clientWrapper) GetService(namespace, name string) (*corev1.Service, bool, error) {
if !c.isWatchedNamespace(namespace) {
return nil, false, fmt.Errorf("failed to get service %s/%s: namespace is not within watched namespaces", namespace, name)
}
service, err := c.factoriesKube[c.lookupNamespace(namespace)].Core().V1().Services().Lister().Services(namespace).Get(name)
exist, err := translateNotFoundError(err)
return service, exist, err
}
// GetEndpoints returns the named endpoints from the given namespace.
func (c *clientWrapper) GetEndpoints(namespace, name string) (*corev1.Endpoints, bool, error) {
if !c.isWatchedNamespace(namespace) {
return nil, false, fmt.Errorf("failed to get endpoints %s/%s: namespace is not within watched namespaces", namespace, name)
}
endpoint, err := c.factoriesKube[c.lookupNamespace(namespace)].Core().V1().Endpoints().Lister().Endpoints(namespace).Get(name)
exist, err := translateNotFoundError(err)
return endpoint, exist, err
}
// GetSecret returns the named secret from the given namespace.
func (c *clientWrapper) GetSecret(namespace, name string) (*corev1.Secret, bool, error) {
if !c.isWatchedNamespace(namespace) {
return nil, false, fmt.Errorf("failed to get secret %s/%s: namespace is not within watched namespaces", namespace, name)
}
secret, err := c.factoriesSecret[c.lookupNamespace(namespace)].Core().V1().Secrets().Lister().Secrets(namespace).Get(name)
exist, err := translateNotFoundError(err)
return secret, exist, err
}
// lookupNamespace returns the lookup namespace key for the given namespace.
// When listening on all namespaces, it returns the client-go identifier ("")
// for all-namespaces. Otherwise, it returns the given namespace.
// The distinction is necessary because we index all informers on the special
// identifier iff all-namespaces are requested but receive specific namespace
// identifiers from the Kubernetes API, so we have to bridge this gap.
func (c *clientWrapper) lookupNamespace(ns string) string {
if c.isNamespaceAll {
return metav1.NamespaceAll
}
return ns
}
// translateNotFoundError will translate a "not found" error to a boolean return
// value which indicates if the resource exists and a nil error.
func translateNotFoundError(err error) (bool, error) {
if kubeerror.IsNotFound(err) {
return false, nil
}
return err == nil, err
}
// isWatchedNamespace checks to ensure that the namespace is being watched before we request
// it to ensure we don't panic by requesting an out-of-watch object.
func (c *clientWrapper) isWatchedNamespace(ns string) bool {
if c.isNamespaceAll {
return true
}
for _, watchedNamespace := range c.watchedNamespaces {
if watchedNamespace == ns {
return true
}
}
return false
}