prometheus/discovery/kubernetes/kubernetes.go

749 lines
24 KiB
Go

// Copyright 2016 The Prometheus 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 kubernetes
import (
"context"
"fmt"
"io/ioutil"
"reflect"
"strings"
"sync"
"time"
"github.com/go-kit/log"
"github.com/go-kit/log/level"
"github.com/pkg/errors"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/common/config"
"github.com/prometheus/common/model"
"github.com/prometheus/common/version"
apiv1 "k8s.io/api/core/v1"
disv1 "k8s.io/api/discovery/v1"
disv1beta1 "k8s.io/api/discovery/v1beta1"
networkv1 "k8s.io/api/networking/v1"
"k8s.io/api/networking/v1beta1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/fields"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/runtime"
utilversion "k8s.io/apimachinery/pkg/util/version"
"k8s.io/apimachinery/pkg/watch"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/tools/clientcmd"
"github.com/prometheus/prometheus/discovery"
"github.com/prometheus/prometheus/discovery/targetgroup"
)
const (
// metaLabelPrefix is the meta prefix used for all meta labels.
// in this discovery.
metaLabelPrefix = model.MetaLabelPrefix + "kubernetes_"
namespaceLabel = metaLabelPrefix + "namespace"
metricsNamespace = "prometheus_sd_kubernetes"
presentValue = model.LabelValue("true")
)
var (
// Http header
userAgent = fmt.Sprintf("Prometheus/%s", version.Version)
// Custom events metric
eventCount = prometheus.NewCounterVec(
prometheus.CounterOpts{
Namespace: metricsNamespace,
Name: "events_total",
Help: "The number of Kubernetes events handled.",
},
[]string{"role", "event"},
)
// DefaultSDConfig is the default Kubernetes SD configuration
DefaultSDConfig = SDConfig{
HTTPClientConfig: config.DefaultHTTPClientConfig,
}
)
func init() {
discovery.RegisterConfig(&SDConfig{})
prometheus.MustRegister(eventCount)
// Initialize metric vectors.
for _, role := range []string{"endpointslice", "endpoints", "node", "pod", "service", "ingress"} {
for _, evt := range []string{"add", "delete", "update"} {
eventCount.WithLabelValues(role, evt)
}
}
(&clientGoRequestMetricAdapter{}).Register(prometheus.DefaultRegisterer)
(&clientGoWorkqueueMetricsProvider{}).Register(prometheus.DefaultRegisterer)
}
// Role is role of the service in Kubernetes.
type Role string
// The valid options for Role.
const (
RoleNode Role = "node"
RolePod Role = "pod"
RoleService Role = "service"
RoleEndpoint Role = "endpoints"
RoleEndpointSlice Role = "endpointslice"
RoleIngress Role = "ingress"
)
// UnmarshalYAML implements the yaml.Unmarshaler interface.
func (c *Role) UnmarshalYAML(unmarshal func(interface{}) error) error {
if err := unmarshal((*string)(c)); err != nil {
return err
}
switch *c {
case RoleNode, RolePod, RoleService, RoleEndpoint, RoleEndpointSlice, RoleIngress:
return nil
default:
return errors.Errorf("unknown Kubernetes SD role %q", *c)
}
}
// SDConfig is the configuration for Kubernetes service discovery.
type SDConfig struct {
APIServer config.URL `yaml:"api_server,omitempty"`
Role Role `yaml:"role"`
KubeConfig string `yaml:"kubeconfig_file"`
HTTPClientConfig config.HTTPClientConfig `yaml:",inline"`
NamespaceDiscovery NamespaceDiscovery `yaml:"namespaces,omitempty"`
Selectors []SelectorConfig `yaml:"selectors,omitempty"`
AttachMetadata AttachMetadataConfig `yaml:"attach_metadata,omitempty"`
}
// Name returns the name of the Config.
func (*SDConfig) Name() string { return "kubernetes" }
// NewDiscoverer returns a Discoverer for the Config.
func (c *SDConfig) NewDiscoverer(opts discovery.DiscovererOptions) (discovery.Discoverer, error) {
return New(opts.Logger, c)
}
// SetDirectory joins any relative file paths with dir.
func (c *SDConfig) SetDirectory(dir string) {
c.HTTPClientConfig.SetDirectory(dir)
c.KubeConfig = config.JoinDir(dir, c.KubeConfig)
}
type roleSelector struct {
node resourceSelector
pod resourceSelector
service resourceSelector
endpoints resourceSelector
endpointslice resourceSelector
ingress resourceSelector
}
type SelectorConfig struct {
Role Role `yaml:"role,omitempty"`
Label string `yaml:"label,omitempty"`
Field string `yaml:"field,omitempty"`
}
type resourceSelector struct {
label string
field string
}
// AttachMetadataConfig is the configuration for attaching additional metadata
// coming from nodes on which the targets are scheduled.
type AttachMetadataConfig struct {
Node bool `yaml:"node"`
}
// UnmarshalYAML implements the yaml.Unmarshaler interface.
func (c *SDConfig) UnmarshalYAML(unmarshal func(interface{}) error) error {
*c = DefaultSDConfig
type plain SDConfig
err := unmarshal((*plain)(c))
if err != nil {
return err
}
if c.Role == "" {
return errors.Errorf("role missing (one of: pod, service, endpoints, endpointslice, node, ingress)")
}
err = c.HTTPClientConfig.Validate()
if err != nil {
return err
}
if c.APIServer.URL != nil && c.KubeConfig != "" {
// Api-server and kubeconfig_file are mutually exclusive
return errors.Errorf("cannot use 'kubeconfig_file' and 'api_server' simultaneously")
}
if c.KubeConfig != "" && !reflect.DeepEqual(c.HTTPClientConfig, config.DefaultHTTPClientConfig) {
// Kubeconfig_file and custom http config are mutually exclusive
return errors.Errorf("cannot use a custom HTTP client configuration together with 'kubeconfig_file'")
}
if c.APIServer.URL == nil && !reflect.DeepEqual(c.HTTPClientConfig, config.DefaultHTTPClientConfig) {
return errors.Errorf("to use custom HTTP client configuration please provide the 'api_server' URL explicitly")
}
if c.APIServer.URL != nil && c.NamespaceDiscovery.IncludeOwnNamespace {
return errors.Errorf("cannot use 'api_server' and 'namespaces.own_namespace' simultaneously")
}
if c.KubeConfig != "" && c.NamespaceDiscovery.IncludeOwnNamespace {
return errors.Errorf("cannot use 'kubeconfig_file' and 'namespaces.own_namespace' simultaneously")
}
foundSelectorRoles := make(map[Role]struct{})
allowedSelectors := map[Role][]string{
RolePod: {string(RolePod)},
RoleService: {string(RoleService)},
RoleEndpointSlice: {string(RolePod), string(RoleService), string(RoleEndpointSlice)},
RoleEndpoint: {string(RolePod), string(RoleService), string(RoleEndpoint)},
RoleNode: {string(RoleNode)},
RoleIngress: {string(RoleIngress)},
}
for _, selector := range c.Selectors {
if _, ok := foundSelectorRoles[selector.Role]; ok {
return errors.Errorf("duplicated selector role: %s", selector.Role)
}
foundSelectorRoles[selector.Role] = struct{}{}
if _, ok := allowedSelectors[c.Role]; !ok {
return errors.Errorf("invalid role: %q, expecting one of: pod, service, endpoints, endpointslice, node or ingress", c.Role)
}
var allowed bool
for _, role := range allowedSelectors[c.Role] {
if role == string(selector.Role) {
allowed = true
break
}
}
if !allowed {
return errors.Errorf("%s role supports only %s selectors", c.Role, strings.Join(allowedSelectors[c.Role], ", "))
}
_, err := fields.ParseSelector(selector.Field)
if err != nil {
return err
}
_, err = labels.Parse(selector.Label)
if err != nil {
return err
}
}
return nil
}
// NamespaceDiscovery is the configuration for discovering
// Kubernetes namespaces.
type NamespaceDiscovery struct {
IncludeOwnNamespace bool `yaml:"own_namespace"`
Names []string `yaml:"names"`
}
// UnmarshalYAML implements the yaml.Unmarshaler interface.
func (c *NamespaceDiscovery) UnmarshalYAML(unmarshal func(interface{}) error) error {
*c = NamespaceDiscovery{}
type plain NamespaceDiscovery
return unmarshal((*plain)(c))
}
// Discovery implements the discoverer interface for discovering
// targets from Kubernetes.
type Discovery struct {
sync.RWMutex
client kubernetes.Interface
role Role
logger log.Logger
namespaceDiscovery *NamespaceDiscovery
discoverers []discovery.Discoverer
selectors roleSelector
ownNamespace string
attachMetadata AttachMetadataConfig
}
func (d *Discovery) getNamespaces() []string {
namespaces := d.namespaceDiscovery.Names
includeOwnNamespace := d.namespaceDiscovery.IncludeOwnNamespace
if len(namespaces) == 0 && !includeOwnNamespace {
return []string{apiv1.NamespaceAll}
}
if includeOwnNamespace && d.ownNamespace != "" {
return append(namespaces, d.ownNamespace)
}
return namespaces
}
// New creates a new Kubernetes discovery for the given role.
func New(l log.Logger, conf *SDConfig) (*Discovery, error) {
if l == nil {
l = log.NewNopLogger()
}
var (
kcfg *rest.Config
err error
ownNamespace string
)
if conf.KubeConfig != "" {
kcfg, err = clientcmd.BuildConfigFromFlags("", conf.KubeConfig)
if err != nil {
return nil, err
}
} else if conf.APIServer.URL == nil {
// Use the Kubernetes provided pod service account
// as described in https://kubernetes.io/docs/admin/service-accounts-admin/
kcfg, err = rest.InClusterConfig()
if err != nil {
return nil, err
}
if conf.NamespaceDiscovery.IncludeOwnNamespace {
ownNamespaceContents, err := ioutil.ReadFile("/var/run/secrets/kubernetes.io/serviceaccount/namespace")
if err != nil {
return nil, fmt.Errorf("could not determine the pod's namespace: %w", err)
}
if len(ownNamespaceContents) == 0 {
return nil, errors.New("could not read own namespace name (empty file)")
}
ownNamespace = string(ownNamespaceContents)
}
level.Info(l).Log("msg", "Using pod service account via in-cluster config")
} else {
rt, err := config.NewRoundTripperFromConfig(conf.HTTPClientConfig, "kubernetes_sd")
if err != nil {
return nil, err
}
kcfg = &rest.Config{
Host: conf.APIServer.String(),
Transport: rt,
}
}
kcfg.UserAgent = userAgent
c, err := kubernetes.NewForConfig(kcfg)
if err != nil {
return nil, err
}
return &Discovery{
client: c,
logger: l,
role: conf.Role,
namespaceDiscovery: &conf.NamespaceDiscovery,
discoverers: make([]discovery.Discoverer, 0),
selectors: mapSelector(conf.Selectors),
ownNamespace: ownNamespace,
attachMetadata: conf.AttachMetadata,
}, nil
}
func mapSelector(rawSelector []SelectorConfig) roleSelector {
rs := roleSelector{}
for _, resourceSelectorRaw := range rawSelector {
switch resourceSelectorRaw.Role {
case RoleEndpointSlice:
rs.endpointslice.field = resourceSelectorRaw.Field
rs.endpointslice.label = resourceSelectorRaw.Label
case RoleEndpoint:
rs.endpoints.field = resourceSelectorRaw.Field
rs.endpoints.label = resourceSelectorRaw.Label
case RoleIngress:
rs.ingress.field = resourceSelectorRaw.Field
rs.ingress.label = resourceSelectorRaw.Label
case RoleNode:
rs.node.field = resourceSelectorRaw.Field
rs.node.label = resourceSelectorRaw.Label
case RolePod:
rs.pod.field = resourceSelectorRaw.Field
rs.pod.label = resourceSelectorRaw.Label
case RoleService:
rs.service.field = resourceSelectorRaw.Field
rs.service.label = resourceSelectorRaw.Label
}
}
return rs
}
const resyncPeriod = 10 * time.Minute
// Run implements the discoverer interface.
func (d *Discovery) Run(ctx context.Context, ch chan<- []*targetgroup.Group) {
d.Lock()
namespaces := d.getNamespaces()
switch d.role {
case RoleEndpointSlice:
// Check "networking.k8s.io/v1" availability with retries.
// If "v1" is not available, use "networking.k8s.io/v1beta1" for backward compatibility
var v1Supported bool
if retryOnError(ctx, 10*time.Second,
func() (err error) {
v1Supported, err = checkDiscoveryV1Supported(d.client)
if err != nil {
level.Error(d.logger).Log("msg", "Failed to check networking.k8s.io/v1 availability", "err", err)
}
return err
},
) {
d.Unlock()
return
}
for _, namespace := range namespaces {
var informer cache.SharedInformer
if v1Supported {
e := d.client.DiscoveryV1().EndpointSlices(namespace)
elw := &cache.ListWatch{
ListFunc: func(options metav1.ListOptions) (runtime.Object, error) {
options.FieldSelector = d.selectors.endpointslice.field
options.LabelSelector = d.selectors.endpointslice.label
return e.List(ctx, options)
},
WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) {
options.FieldSelector = d.selectors.endpointslice.field
options.LabelSelector = d.selectors.endpointslice.label
return e.Watch(ctx, options)
},
}
informer = cache.NewSharedInformer(elw, &disv1.EndpointSlice{}, resyncPeriod)
} else {
e := d.client.DiscoveryV1beta1().EndpointSlices(namespace)
elw := &cache.ListWatch{
ListFunc: func(options metav1.ListOptions) (runtime.Object, error) {
options.FieldSelector = d.selectors.endpointslice.field
options.LabelSelector = d.selectors.endpointslice.label
return e.List(ctx, options)
},
WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) {
options.FieldSelector = d.selectors.endpointslice.field
options.LabelSelector = d.selectors.endpointslice.label
return e.Watch(ctx, options)
},
}
informer = cache.NewSharedInformer(elw, &disv1beta1.EndpointSlice{}, resyncPeriod)
}
s := d.client.CoreV1().Services(namespace)
slw := &cache.ListWatch{
ListFunc: func(options metav1.ListOptions) (runtime.Object, error) {
options.FieldSelector = d.selectors.service.field
options.LabelSelector = d.selectors.service.label
return s.List(ctx, options)
},
WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) {
options.FieldSelector = d.selectors.service.field
options.LabelSelector = d.selectors.service.label
return s.Watch(ctx, options)
},
}
p := d.client.CoreV1().Pods(namespace)
plw := &cache.ListWatch{
ListFunc: func(options metav1.ListOptions) (runtime.Object, error) {
options.FieldSelector = d.selectors.pod.field
options.LabelSelector = d.selectors.pod.label
return p.List(ctx, options)
},
WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) {
options.FieldSelector = d.selectors.pod.field
options.LabelSelector = d.selectors.pod.label
return p.Watch(ctx, options)
},
}
eps := NewEndpointSlice(
log.With(d.logger, "role", "endpointslice"),
cache.NewSharedInformer(slw, &apiv1.Service{}, resyncPeriod),
informer,
cache.NewSharedInformer(plw, &apiv1.Pod{}, resyncPeriod),
)
d.discoverers = append(d.discoverers, eps)
go eps.endpointSliceInf.Run(ctx.Done())
go eps.serviceInf.Run(ctx.Done())
go eps.podInf.Run(ctx.Done())
}
case RoleEndpoint:
for _, namespace := range namespaces {
e := d.client.CoreV1().Endpoints(namespace)
elw := &cache.ListWatch{
ListFunc: func(options metav1.ListOptions) (runtime.Object, error) {
options.FieldSelector = d.selectors.endpoints.field
options.LabelSelector = d.selectors.endpoints.label
return e.List(ctx, options)
},
WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) {
options.FieldSelector = d.selectors.endpoints.field
options.LabelSelector = d.selectors.endpoints.label
return e.Watch(ctx, options)
},
}
s := d.client.CoreV1().Services(namespace)
slw := &cache.ListWatch{
ListFunc: func(options metav1.ListOptions) (runtime.Object, error) {
options.FieldSelector = d.selectors.service.field
options.LabelSelector = d.selectors.service.label
return s.List(ctx, options)
},
WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) {
options.FieldSelector = d.selectors.service.field
options.LabelSelector = d.selectors.service.label
return s.Watch(ctx, options)
},
}
p := d.client.CoreV1().Pods(namespace)
plw := &cache.ListWatch{
ListFunc: func(options metav1.ListOptions) (runtime.Object, error) {
options.FieldSelector = d.selectors.pod.field
options.LabelSelector = d.selectors.pod.label
return p.List(ctx, options)
},
WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) {
options.FieldSelector = d.selectors.pod.field
options.LabelSelector = d.selectors.pod.label
return p.Watch(ctx, options)
},
}
eps := NewEndpoints(
log.With(d.logger, "role", "endpoint"),
cache.NewSharedInformer(slw, &apiv1.Service{}, resyncPeriod),
cache.NewSharedInformer(elw, &apiv1.Endpoints{}, resyncPeriod),
cache.NewSharedInformer(plw, &apiv1.Pod{}, resyncPeriod),
)
d.discoverers = append(d.discoverers, eps)
go eps.endpointsInf.Run(ctx.Done())
go eps.serviceInf.Run(ctx.Done())
go eps.podInf.Run(ctx.Done())
}
case RolePod:
var nodeInformer cache.SharedInformer
if d.attachMetadata.Node {
nodeInformer = d.newNodeInformer(ctx)
go nodeInformer.Run(ctx.Done())
}
for _, namespace := range namespaces {
p := d.client.CoreV1().Pods(namespace)
plw := &cache.ListWatch{
ListFunc: func(options metav1.ListOptions) (runtime.Object, error) {
options.FieldSelector = d.selectors.pod.field
options.LabelSelector = d.selectors.pod.label
return p.List(ctx, options)
},
WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) {
options.FieldSelector = d.selectors.pod.field
options.LabelSelector = d.selectors.pod.label
return p.Watch(ctx, options)
},
}
pod := NewPod(
log.With(d.logger, "role", "pod"),
d.newPodsByNodeInformer(plw),
nodeInformer,
)
d.discoverers = append(d.discoverers, pod)
go pod.podInf.Run(ctx.Done())
}
case RoleService:
for _, namespace := range namespaces {
s := d.client.CoreV1().Services(namespace)
slw := &cache.ListWatch{
ListFunc: func(options metav1.ListOptions) (runtime.Object, error) {
options.FieldSelector = d.selectors.service.field
options.LabelSelector = d.selectors.service.label
return s.List(ctx, options)
},
WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) {
options.FieldSelector = d.selectors.service.field
options.LabelSelector = d.selectors.service.label
return s.Watch(ctx, options)
},
}
svc := NewService(
log.With(d.logger, "role", "service"),
cache.NewSharedInformer(slw, &apiv1.Service{}, resyncPeriod),
)
d.discoverers = append(d.discoverers, svc)
go svc.informer.Run(ctx.Done())
}
case RoleIngress:
// Check "networking.k8s.io/v1" availability with retries.
// If "v1" is not available, use "networking.k8s.io/v1beta1" for backward compatibility
var v1Supported bool
if retryOnError(ctx, 10*time.Second,
func() (err error) {
v1Supported, err = checkNetworkingV1Supported(d.client)
if err != nil {
level.Error(d.logger).Log("msg", "Failed to check networking.k8s.io/v1 availability", "err", err)
}
return err
},
) {
d.Unlock()
return
}
for _, namespace := range namespaces {
var informer cache.SharedInformer
if v1Supported {
i := d.client.NetworkingV1().Ingresses(namespace)
ilw := &cache.ListWatch{
ListFunc: func(options metav1.ListOptions) (runtime.Object, error) {
options.FieldSelector = d.selectors.ingress.field
options.LabelSelector = d.selectors.ingress.label
return i.List(ctx, options)
},
WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) {
options.FieldSelector = d.selectors.ingress.field
options.LabelSelector = d.selectors.ingress.label
return i.Watch(ctx, options)
},
}
informer = cache.NewSharedInformer(ilw, &networkv1.Ingress{}, resyncPeriod)
} else {
i := d.client.NetworkingV1beta1().Ingresses(namespace)
ilw := &cache.ListWatch{
ListFunc: func(options metav1.ListOptions) (runtime.Object, error) {
options.FieldSelector = d.selectors.ingress.field
options.LabelSelector = d.selectors.ingress.label
return i.List(ctx, options)
},
WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) {
options.FieldSelector = d.selectors.ingress.field
options.LabelSelector = d.selectors.ingress.label
return i.Watch(ctx, options)
},
}
informer = cache.NewSharedInformer(ilw, &v1beta1.Ingress{}, resyncPeriod)
}
ingress := NewIngress(
log.With(d.logger, "role", "ingress"),
informer,
)
d.discoverers = append(d.discoverers, ingress)
go ingress.informer.Run(ctx.Done())
}
case RoleNode:
nodeInformer := d.newNodeInformer(ctx)
node := NewNode(log.With(d.logger, "role", "node"), nodeInformer)
d.discoverers = append(d.discoverers, node)
go node.informer.Run(ctx.Done())
default:
level.Error(d.logger).Log("msg", "unknown Kubernetes discovery kind", "role", d.role)
}
var wg sync.WaitGroup
for _, dd := range d.discoverers {
wg.Add(1)
go func(d discovery.Discoverer) {
defer wg.Done()
d.Run(ctx, ch)
}(dd)
}
d.Unlock()
wg.Wait()
<-ctx.Done()
}
func lv(s string) model.LabelValue {
return model.LabelValue(s)
}
func send(ctx context.Context, ch chan<- []*targetgroup.Group, tg *targetgroup.Group) {
if tg == nil {
return
}
select {
case <-ctx.Done():
case ch <- []*targetgroup.Group{tg}:
}
}
func retryOnError(ctx context.Context, interval time.Duration, f func() error) (canceled bool) {
var err error
err = f()
for {
if err == nil {
return false
}
select {
case <-ctx.Done():
return true
case <-time.After(interval):
err = f()
}
}
}
func checkNetworkingV1Supported(client kubernetes.Interface) (bool, error) {
k8sVer, err := client.Discovery().ServerVersion()
if err != nil {
return false, err
}
semVer, err := utilversion.ParseSemantic(k8sVer.String())
if err != nil {
return false, err
}
// networking.k8s.io/v1 is available since Kubernetes v1.19
// https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG/CHANGELOG-1.19.md
return semVer.Major() >= 1 && semVer.Minor() >= 19, nil
}
func (d *Discovery) newNodeInformer(ctx context.Context) cache.SharedInformer {
nlw := &cache.ListWatch{
ListFunc: func(options metav1.ListOptions) (runtime.Object, error) {
options.FieldSelector = d.selectors.node.field
options.LabelSelector = d.selectors.node.label
return d.client.CoreV1().Nodes().List(ctx, options)
},
WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) {
options.FieldSelector = d.selectors.node.field
options.LabelSelector = d.selectors.node.label
return d.client.CoreV1().Nodes().Watch(ctx, options)
},
}
return cache.NewSharedInformer(nlw, &apiv1.Node{}, resyncPeriod)
}
func (d *Discovery) newPodsByNodeInformer(plw *cache.ListWatch) cache.SharedIndexInformer {
indexers := make(map[string]cache.IndexFunc)
if d.attachMetadata.Node {
indexers[nodeIndex] = func(obj interface{}) ([]string, error) {
pod, ok := obj.(*apiv1.Pod)
if !ok {
return nil, fmt.Errorf("object is not a pod")
}
return []string{pod.Spec.NodeName}, nil
}
}
return cache.NewSharedIndexInformer(plw, &apiv1.Pod{}, resyncPeriod, indexers)
}
func checkDiscoveryV1Supported(client kubernetes.Interface) (bool, error) {
k8sVer, err := client.Discovery().ServerVersion()
if err != nil {
return false, err
}
semVer, err := utilversion.ParseSemantic(k8sVer.String())
if err != nil {
return false, err
}
// The discovery.k8s.io/v1beta1 API version of EndpointSlice will no longer be served in v1.25.
// discovery.k8s.io/v1 is available since Kubernetes v1.21
// https://kubernetes.io/docs/reference/using-api/deprecation-guide/#v1-25
return semVer.Major() >= 1 && semVer.Minor() >= 21, nil
}