mirror of
https://github.com/kubernetes-sigs/prometheus-adapter.git
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112 lines
3.3 KiB
Go
112 lines
3.3 KiB
Go
package dynamicmapper
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import (
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"fmt"
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"sync"
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"time"
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"k8s.io/apimachinery/pkg/api/meta"
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"k8s.io/apimachinery/pkg/runtime/schema"
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"k8s.io/apimachinery/pkg/util/wait"
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"k8s.io/client-go/discovery"
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"k8s.io/client-go/restmapper"
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"k8s.io/klog"
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)
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// RengeneratingDiscoveryRESTMapper is a RESTMapper which Regenerates its cache of mappings periodically.
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// It functions by recreating a normal discovery RESTMapper at the specified interval.
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// We don't refresh automatically on cache misses, since we get called on every label, plenty of which will
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// be unrelated to Kubernetes resources.
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type RegeneratingDiscoveryRESTMapper struct {
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discoveryClient discovery.DiscoveryInterface
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refreshInterval time.Duration
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mu sync.RWMutex
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delegate meta.RESTMapper
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}
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func NewRESTMapper(discoveryClient discovery.DiscoveryInterface, refreshInterval time.Duration) (*RegeneratingDiscoveryRESTMapper, error) {
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mapper := &RegeneratingDiscoveryRESTMapper{
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discoveryClient: discoveryClient,
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refreshInterval: refreshInterval,
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}
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if err := mapper.RegenerateMappings(); err != nil {
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return nil, fmt.Errorf("unable to populate initial set of REST mappings: %v", err)
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}
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return mapper, nil
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}
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// RunUtil runs the mapping refresher until the given stop channel is closed.
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func (m *RegeneratingDiscoveryRESTMapper) RunUntil(stop <-chan struct{}) {
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go wait.Until(func() {
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if err := m.RegenerateMappings(); err != nil {
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klog.Errorf("error regenerating REST mappings from discovery: %v", err)
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}
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}, m.refreshInterval, stop)
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}
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func (m *RegeneratingDiscoveryRESTMapper) RegenerateMappings() error {
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resources, err := restmapper.GetAPIGroupResources(m.discoveryClient)
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if err != nil {
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return err
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}
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newDelegate := restmapper.NewDiscoveryRESTMapper(resources)
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// don't lock until we're ready to replace
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m.mu.Lock()
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defer m.mu.Unlock()
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m.delegate = newDelegate
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return nil
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}
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func (m *RegeneratingDiscoveryRESTMapper) KindFor(resource schema.GroupVersionResource) (schema.GroupVersionKind, error) {
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m.mu.RLock()
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defer m.mu.RUnlock()
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return m.delegate.KindFor(resource)
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}
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func (m *RegeneratingDiscoveryRESTMapper) KindsFor(resource schema.GroupVersionResource) ([]schema.GroupVersionKind, error) {
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m.mu.RLock()
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defer m.mu.RUnlock()
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return m.delegate.KindsFor(resource)
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}
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func (m *RegeneratingDiscoveryRESTMapper) ResourceFor(input schema.GroupVersionResource) (schema.GroupVersionResource, error) {
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m.mu.RLock()
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defer m.mu.RUnlock()
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return m.delegate.ResourceFor(input)
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}
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func (m *RegeneratingDiscoveryRESTMapper) ResourcesFor(input schema.GroupVersionResource) ([]schema.GroupVersionResource, error) {
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m.mu.RLock()
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defer m.mu.RUnlock()
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return m.delegate.ResourcesFor(input)
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}
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func (m *RegeneratingDiscoveryRESTMapper) RESTMapping(gk schema.GroupKind, versions ...string) (*meta.RESTMapping, error) {
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m.mu.RLock()
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defer m.mu.RUnlock()
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return m.delegate.RESTMapping(gk, versions...)
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}
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func (m *RegeneratingDiscoveryRESTMapper) RESTMappings(gk schema.GroupKind, versions ...string) ([]*meta.RESTMapping, error) {
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m.mu.RLock()
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defer m.mu.RUnlock()
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return m.delegate.RESTMappings(gk, versions...)
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}
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func (m *RegeneratingDiscoveryRESTMapper) ResourceSingularizer(resource string) (singular string, err error) {
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m.mu.RLock()
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defer m.mu.RUnlock()
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return m.delegate.ResourceSingularizer(resource)
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}
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