506 lines
15 KiB
Go
506 lines
15 KiB
Go
package store
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import (
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"context"
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"fmt"
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"math"
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"sort"
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"strings"
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"sync"
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"time"
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apierrors "k8s.io/apimachinery/pkg/api/errors"
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"k8s.io/apimachinery/pkg/api/meta"
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metainternalversion "k8s.io/apimachinery/pkg/apis/meta/internalversion"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/runtime/schema"
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"k8s.io/apimachinery/pkg/watch"
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"k8s.io/apiserver/pkg/endpoints/request"
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"k8s.io/client-go/dynamic"
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"k8s.io/klog/v2"
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utiltrace "k8s.io/utils/trace"
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)
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// Store is the cache for resources from multiple member clusters
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type Store interface {
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UpdateCache(resourcesByCluster map[string]map[schema.GroupVersionResource]*MultiNamespace) error
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HasResource(resource schema.GroupVersionResource) bool
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GetResourceFromCache(ctx context.Context, gvr schema.GroupVersionResource, namespace, name string) (runtime.Object, string, error)
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Stop()
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Get(ctx context.Context, gvr schema.GroupVersionResource, name string, options *metav1.GetOptions) (runtime.Object, error)
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List(ctx context.Context, gvr schema.GroupVersionResource, options *metainternalversion.ListOptions) (runtime.Object, error)
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Watch(ctx context.Context, gvr schema.GroupVersionResource, options *metainternalversion.ListOptions) (watch.Interface, error)
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}
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// MultiClusterCache caches resource from multi member clusters
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type MultiClusterCache struct {
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lock sync.RWMutex
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cache map[string]*clusterCache
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cachedResources map[schema.GroupVersionResource]struct{}
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restMapper meta.RESTMapper
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// newClientFunc returns a dynamic client for member cluster apiserver
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newClientFunc func(string) (dynamic.Interface, error)
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}
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var _ Store = &MultiClusterCache{}
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// NewMultiClusterCache return a cache for resources from member clusters
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func NewMultiClusterCache(newClientFunc func(string) (dynamic.Interface, error), restMapper meta.RESTMapper) *MultiClusterCache {
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return &MultiClusterCache{
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restMapper: restMapper,
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newClientFunc: newClientFunc,
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cache: map[string]*clusterCache{},
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cachedResources: map[schema.GroupVersionResource]struct{}{},
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}
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}
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// UpdateCache update cache for multi clusters
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func (c *MultiClusterCache) UpdateCache(resourcesByCluster map[string]map[schema.GroupVersionResource]*MultiNamespace) error {
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if klog.V(3).Enabled() {
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start := time.Now()
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defer func() {
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klog.Infof("MultiClusterCache update cache takes %v", time.Since(start))
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}()
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}
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c.lock.Lock()
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defer c.lock.Unlock()
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// remove non-exist clusters
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for clusterName := range c.cache {
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if _, exist := resourcesByCluster[clusterName]; !exist {
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klog.Infof("Remove cache for cluster %s", clusterName)
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c.cache[clusterName].stop()
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delete(c.cache, clusterName)
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}
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}
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// add/update cluster cache
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for clusterName, resources := range resourcesByCluster {
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cache, exist := c.cache[clusterName]
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if !exist {
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klog.Infof("Add cache for cluster %v", clusterName)
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cache = newClusterCache(clusterName, c.clientForClusterFunc(clusterName), c.restMapper)
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c.cache[clusterName] = cache
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}
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err := cache.updateCache(resources)
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if err != nil {
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return err
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}
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}
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// update cachedResource
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newCachedResources := make(map[schema.GroupVersionResource]struct{}, len(c.cachedResources))
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for _, resources := range resourcesByCluster {
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for resource := range resources {
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newCachedResources[resource] = struct{}{}
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}
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}
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for resource := range c.cachedResources {
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if _, exist := newCachedResources[resource]; !exist {
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delete(c.cachedResources, resource)
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}
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}
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for resource := range newCachedResources {
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if _, exist := c.cachedResources[resource]; !exist {
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c.cachedResources[resource] = struct{}{}
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}
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}
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return nil
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}
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// Stop stops the cache for multi cluster.
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func (c *MultiClusterCache) Stop() {
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c.lock.RLock()
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defer c.lock.RUnlock()
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for _, cache := range c.cache {
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cache.stop()
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}
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}
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// HasResource return whether resource is cached.
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func (c *MultiClusterCache) HasResource(resource schema.GroupVersionResource) bool {
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c.lock.RLock()
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defer c.lock.RUnlock()
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_, ok := c.cachedResources[resource]
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return ok
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}
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// GetResourceFromCache returns which cluster the resource belong to.
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func (c *MultiClusterCache) GetResourceFromCache(ctx context.Context, gvr schema.GroupVersionResource, namespace, name string) (runtime.Object, string, error) {
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obj, cluster, _, err := c.getResourceFromCache(ctx, gvr, namespace, name)
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return obj, cluster, err
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}
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// Get returns the target object
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func (c *MultiClusterCache) Get(ctx context.Context, gvr schema.GroupVersionResource, name string, options *metav1.GetOptions) (runtime.Object, error) {
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_, clusterName, cache, err := c.getResourceFromCache(ctx, gvr, request.NamespaceValue(ctx), name)
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if err != nil {
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return nil, err
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}
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obj, err := cache.Get(ctx, name, options)
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if err != nil {
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return nil, err
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}
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cloneObj := obj.DeepCopyObject()
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accessor, err := meta.Accessor(cloneObj)
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if err != nil {
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return nil, err
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}
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mrv := newMultiClusterResourceVersionWithCapacity(1)
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mrv.set(clusterName, accessor.GetResourceVersion())
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accessor.SetResourceVersion(mrv.String())
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addCacheSourceAnnotation(cloneObj, clusterName)
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return cloneObj, err
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}
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// List returns the object list
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// nolint:gocyclo
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func (c *MultiClusterCache) List(ctx context.Context, gvr schema.GroupVersionResource, o *metainternalversion.ListOptions) (runtime.Object, error) {
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klog.V(5).Infof("Request list %v with rv=%#v, continue=%#v, limit=%v", gvr.String(),
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newMultiClusterResourceVersionFromString(o.ResourceVersion), newMultiClusterContinueFromString(o.Continue), o.Limit)
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requestCluster, options, requestResourceVersion := prepareBeforeList(o)
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var resultObject runtime.Object
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items := make([]runtime.Object, 0, int(math.Min(float64(options.Limit), 1024)))
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clusters := c.getClusterNames()
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sort.Strings(clusters)
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responseResourceVersion := requestResourceVersion.clone()
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responseContinue := multiClusterContinue{}
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trace := utiltrace.New("MultiClusterCache.List",
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utiltrace.Field{Key: "gvr", Value: gvr},
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utiltrace.Field{Key: "rv", Value: newMultiClusterResourceVersionFromString(o.ResourceVersion)},
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utiltrace.Field{Key: "continue", Value: newMultiClusterContinueFromString(o.Continue)},
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utiltrace.Field{Key: "limit", Value: o.Limit},
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)
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defer trace.LogIfLong(5 * time.Second)
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defer func() {
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klog.V(5).Infof("Response list %v with rv=%#v continue=%#v", gvr.String(), responseResourceVersion, responseContinue)
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}()
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listFunc := func(cluster string) (int, string, error) {
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if requestCluster != "" && requestCluster != cluster {
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return 0, "", nil
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}
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// clear the requestContinue, for searching other clusters at next list
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defer func() {
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requestCluster = ""
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options.Continue = ""
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}()
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cache := c.cacheForClusterResource(cluster, gvr)
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if cache == nil {
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klog.V(4).Infof("cluster %v does not cache resource %v", cluster, gvr.String())
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return 0, "", nil
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}
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if options.Continue != "" {
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// specifying resource version is not allowed when using continue
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options.ResourceVersion = ""
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} else {
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options.ResourceVersion = requestResourceVersion.get(cluster)
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}
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defer trace.Step("list from member cluster",
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utiltrace.Field{Key: "cluster", Value: cluster},
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utiltrace.Field{Key: "options", Value: fmt.Sprintf("%#v", options)},
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)
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obj, err := cache.List(ctx, options)
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if err != nil {
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return 0, "", err
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}
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list, err := meta.ListAccessor(obj)
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if err != nil {
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return 0, "", err
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}
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if resultObject == nil {
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resultObject = obj
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}
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cnt := 0
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err = meta.EachListItem(obj, func(o runtime.Object) error {
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clone := o.DeepCopyObject()
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addCacheSourceAnnotation(clone, cluster)
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items = append(items, clone)
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cnt++
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return nil
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})
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if err != nil {
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return 0, "", err
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}
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responseResourceVersion.set(cluster, list.GetResourceVersion())
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return cnt, list.GetContinue(), nil
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}
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if options.Limit == 0 {
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for _, cluster := range clusters {
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_, _, err := listFunc(cluster)
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if err != nil {
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return nil, err
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}
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}
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} else {
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for clusterIdx, cluster := range clusters {
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n, cont, err := listFunc(cluster)
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if err != nil {
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return nil, err
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}
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options.Limit -= int64(n)
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if options.Limit <= 0 {
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if cont != "" {
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// Current cluster has remaining items, return this cluster name and continue for next list.
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responseContinue.Cluster = cluster
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responseContinue.Continue = cont
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} else if (clusterIdx + 1) < len(clusters) {
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// Current cluster has no remaining items. But we don't know whether next cluster has.
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// So return the next cluster name for continue listing.
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responseContinue.Cluster = clusters[clusterIdx+1]
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}
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// No more items remains. Break the chuck list.
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break
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}
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}
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}
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if err := c.fillMissingClusterResourceVersion(ctx, responseResourceVersion, clusters, gvr); err != nil {
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return nil, err
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}
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responseContinue.RV = responseResourceVersion.String()
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if resultObject == nil {
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resultObject = &metav1.List{
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TypeMeta: metav1.TypeMeta{
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APIVersion: "v1",
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Kind: "List",
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},
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ListMeta: metav1.ListMeta{},
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Items: []runtime.RawExtension{},
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}
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}
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err := meta.SetList(resultObject, items)
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if err != nil {
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return nil, err
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}
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accessor, err := meta.ListAccessor(resultObject)
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if err != nil {
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return nil, err
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}
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accessor.SetResourceVersion(responseResourceVersion.String())
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accessor.SetContinue(responseContinue.String())
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return resultObject, nil
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}
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// Watch watches the resource
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func (c *MultiClusterCache) Watch(ctx context.Context, gvr schema.GroupVersionResource, options *metainternalversion.ListOptions) (watch.Interface, error) {
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klog.V(5).Infof("Request watch %v with rv=%v", gvr.String(), options.ResourceVersion)
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resourceVersion := newMultiClusterResourceVersionFromString(options.ResourceVersion)
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responseResourceVersion := newMultiClusterResourceVersionFromString(options.ResourceVersion)
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responseResourceVersionLock := sync.Mutex{}
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setObjectResourceVersionFunc := func(cluster string, obj runtime.Object) {
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accessor, err := meta.Accessor(obj)
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if err != nil {
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return
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}
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responseResourceVersionLock.Lock()
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defer responseResourceVersionLock.Unlock()
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responseResourceVersion.set(cluster, accessor.GetResourceVersion())
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accessor.SetResourceVersion(responseResourceVersion.String())
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}
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mux := newWatchMux()
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clusters := c.getClusterNames()
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for i := range clusters {
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cluster := clusters[i]
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options.ResourceVersion = resourceVersion.get(cluster)
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cache := c.cacheForClusterResource(cluster, gvr)
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if cache == nil {
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continue
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}
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w, err := cache.Watch(ctx, options)
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if err != nil {
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return nil, err
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}
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mux.AddSource(w, func(e watch.Event) {
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setObjectResourceVersionFunc(cluster, e.Object)
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addCacheSourceAnnotation(e.Object, cluster)
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})
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}
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mux.Start()
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return mux, nil
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}
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func (c *MultiClusterCache) getClusterNames() []string {
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c.lock.RLock()
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defer c.lock.RUnlock()
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clusters := make([]string, 0, len(c.cache))
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for c := range c.cache {
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clusters = append(clusters, c)
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}
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return clusters
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}
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func (c *MultiClusterCache) cacheForClusterResource(cluster string, gvr schema.GroupVersionResource) *resourceCache {
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c.lock.RLock()
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cc := c.cache[cluster]
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c.lock.RUnlock()
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if cc == nil {
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return nil
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}
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return cc.cacheForResource(gvr)
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}
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func (c *MultiClusterCache) getResourceFromCache(ctx context.Context, gvr schema.GroupVersionResource, namespace, name string) (runtime.Object, string, *resourceCache, error) {
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c.lock.RLock()
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defer c.lock.RUnlock()
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var findObjects []runtime.Object
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var findCaches []*resourceCache
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// Set ResourceVersion=0 to get resource from cache.
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options := &metav1.GetOptions{ResourceVersion: "0"}
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for clusterName, cc := range c.cache {
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cache := cc.cache[gvr]
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if cache == nil {
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// This cluster doesn't cache this resource
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continue
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}
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obj, err := cache.Get(request.WithNamespace(ctx, namespace), name, options)
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if apierrors.IsNotFound(err) {
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continue
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}
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if err != nil {
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return nil, "", nil, fmt.Errorf("fail to get %v %v from %v: %v", namespace, name, clusterName, err)
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}
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findObjects = append(findObjects, obj)
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findCaches = append(findCaches, cache)
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}
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if len(findObjects) == 0 {
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return nil, "", nil, apierrors.NewNotFound(gvr.GroupResource(), name)
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}
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if len(findObjects) > 1 {
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clusterNames := make([]string, 0, len(findCaches))
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for _, cache := range findCaches {
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clusterNames = append(clusterNames, cache.clusterName)
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}
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return nil, "", nil, apierrors.NewConflict(gvr.GroupResource(), name, fmt.Errorf("ambiguous objects in clusters [%v]", strings.Join(clusterNames, ", ")))
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}
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return findObjects[0], findCaches[0].clusterName, findCaches[0], nil
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}
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func (c *MultiClusterCache) clientForClusterFunc(cluster string) func() (dynamic.Interface, error) {
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return func() (dynamic.Interface, error) {
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return c.newClientFunc(cluster)
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}
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}
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func (c *MultiClusterCache) fillMissingClusterResourceVersion(ctx context.Context, mcv *multiClusterResourceVersion, clusters []string, gvr schema.GroupVersionResource) error {
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errChan := make(chan error)
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var lock sync.Mutex
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var wg sync.WaitGroup
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for _, cluster := range clusters {
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if _, ok := mcv.rvs[cluster]; ok {
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continue
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}
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wg.Add(1)
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go func(cluster string) {
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defer wg.Done()
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klog.V(5).Infof("fillMissingClusterResourceVersion gvr=%v cluster=%v", gvr, cluster)
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rv, err := c.getClusterResourceVersion(ctx, cluster, gvr)
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if err != nil {
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errChan <- err
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return
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}
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if rv == "" {
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return
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}
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lock.Lock()
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defer lock.Unlock()
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mcv.set(cluster, rv)
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}(cluster)
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}
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waitChan := make(chan struct{}, 1)
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go func() {
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wg.Wait()
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waitChan <- struct{}{}
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}()
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var err error
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select {
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case <-waitChan:
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case err = <-errChan:
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}
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return err
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}
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func (c *MultiClusterCache) getClusterResourceVersion(ctx context.Context, cluster string, gvr schema.GroupVersionResource) (string, error) {
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cache := c.cacheForClusterResource(cluster, gvr)
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if cache == nil {
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klog.V(4).Infof("cluster %v does not cache resource %v", cluster, gvr.String())
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return "", nil
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}
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obj, err := cache.List(ctx, &metainternalversion.ListOptions{
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Limit: 1,
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})
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if err != nil {
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return "", err
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}
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listObj, err := meta.ListAccessor(obj)
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if err != nil {
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return "", err
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}
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return listObj.GetResourceVersion(), nil
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}
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// Inputs and outputs:
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// o.ResourceVersion o.Continue | cluster options.ResourceVersion options.Continue mrv
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// xxxx "" | "" xxxx "" decode(xxx)
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// "" {rv=xxx,cluster=c2,continue=} | c2 decode(xxx)[c2] "" decode(xxx)
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// "" {rv=xxx,cluster=c2,continue=yyy} | c2 "" yyy decode(xxx)
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func prepareBeforeList(o *metainternalversion.ListOptions) (cluster string, options *metainternalversion.ListOptions, mrv *multiClusterResourceVersion) {
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options = o.DeepCopy()
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if o.Continue == "" {
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mrv = newMultiClusterResourceVersionFromString(o.ResourceVersion)
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return
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}
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mc := newMultiClusterContinueFromString(o.Continue)
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cluster = mc.Cluster
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mrv = newMultiClusterResourceVersionFromString(mc.RV)
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if mc.Continue == "" {
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options.ResourceVersion = mrv.get(cluster)
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options.Continue = ""
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} else {
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options.ResourceVersion = ""
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options.Continue = mc.Continue
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}
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return
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}
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