/
aggregator.go
483 lines (448 loc) · 18.6 KB
/
aggregator.go
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// Copyright 2020 Antrea 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 stats
import (
"fmt"
"sync"
"time"
networkingv1 "k8s.io/api/networking/v1"
"k8s.io/apimachinery/pkg/api/meta"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/sets"
networkinginformers "k8s.io/client-go/informers/networking/v1"
"k8s.io/client-go/tools/cache"
"k8s.io/klog/v2"
"antrea.io/antrea/pkg/apis/controlplane"
crdv1alpha1 "antrea.io/antrea/pkg/apis/crd/v1alpha1"
statsv1alpha1 "antrea.io/antrea/pkg/apis/stats/v1alpha1"
crdinformers "antrea.io/antrea/pkg/client/informers/externalversions/crd/v1alpha1"
"antrea.io/antrea/pkg/features"
"antrea.io/antrea/pkg/util/k8s"
)
const (
uidIndex = "uid"
GroupNameIndexName = "groupName"
)
// Aggregator collects the stats from the antrea-agents, aggregates them, caches the result, and provides interfaces
// for Stats API handlers to query them. It implements the following interfaces:
// - pkg/apiserver/registry/controlplane/nodestatssummary.statsCollector
// - pkg/apiserver/registry/stats/networkpolicystats.statsProvider
// - pkg/apiserver/registry/stats/antreaclusternetworkpolicystats.statsProvider
// - pkg/apiserver/registry/stats/antreanetworkpolicystats.statsProvider
// - pkg/apiserver/registry/stats/multicastgroup.statsProvider
type Aggregator struct {
// networkPolicyStats caches the statistics of K8s NetworkPolicies collected from the antrea-agents.
networkPolicyStats cache.Indexer
// antreaClusterNetworkPolicyStats caches the statistics of Antrea ClusterNetworkPolicies collected from the antrea-agents.
antreaClusterNetworkPolicyStats cache.Indexer
// antreaNetworkPolicyStats caches the statistics of Antrea NetworkPolicies collected from the antrea-agents.
antreaNetworkPolicyStats cache.Indexer
// groupNodePodsMap caches the information of Pods in a Node that have joined multicast groups collected from the antrea-agents.
// The map can be interpreted as
// map[IP of multicast group]map[name of node]list of PodReference.
groupNodePodsMap map[string]map[string][]statsv1alpha1.PodReference
groupNodePodsMapMutex sync.RWMutex
// dataCh is the channel that buffers the NodeSummaries sent by antrea-agents.
dataCh chan *controlplane.NodeStatsSummary
// npListerSynced is a function which returns true if the K8s NetworkPolicy shared informer has been synced at least once.
npListerSynced cache.InformerSynced
// cnpListerSynced is a function which returns true if the Antrea ClusterNetworkPolicy shared informer has been synced at least once.
cnpListerSynced cache.InformerSynced
// anpListerSynced is a function which returns true if the Antrea NetworkPolicy shared informer has been synced at least once.
anpListerSynced cache.InformerSynced
}
// uidIndexFunc is an index function that indexes based on an object's UID.
func uidIndexFunc(obj interface{}) ([]string, error) {
meta, err := meta.Accessor(obj)
if err != nil {
return []string{""}, fmt.Errorf("object has no meta: %v", err)
}
return []string{string(meta.GetUID())}, nil
}
func NewAggregator(networkPolicyInformer networkinginformers.NetworkPolicyInformer, cnpInformer crdinformers.ClusterNetworkPolicyInformer, anpInformer crdinformers.NetworkPolicyInformer) *Aggregator {
aggregator := &Aggregator{
networkPolicyStats: cache.NewIndexer(cache.MetaNamespaceKeyFunc, cache.Indexers{cache.NamespaceIndex: cache.MetaNamespaceIndexFunc, uidIndex: uidIndexFunc}),
dataCh: make(chan *controlplane.NodeStatsSummary, 1000),
npListerSynced: networkPolicyInformer.Informer().HasSynced,
}
// Add handlers for NetworkPolicy events.
// They are the source of truth of the NetworkPolicyStats, i.e., a NetworkPolicyStats is present only if the
// corresponding NetworkPolicy is present.
networkPolicyInformer.Informer().AddEventHandlerWithResyncPeriod(
cache.ResourceEventHandlerFuncs{
AddFunc: aggregator.addNetworkPolicy,
DeleteFunc: aggregator.deleteNetworkPolicy,
},
// Set resyncPeriod to 0 to disable resyncing.
0,
)
// Register Informer and add handlers for AntreaPolicy events only if the feature is enabled.
// They are the source of truth of the ClusterNetworkPolicyStats, i.e., a ClusterNetworkPolicyStats is present
// only if the corresponding ClusterNetworkPolicy is present.
if features.DefaultFeatureGate.Enabled(features.AntreaPolicy) {
aggregator.antreaClusterNetworkPolicyStats = cache.NewIndexer(cache.MetaNamespaceKeyFunc, cache.Indexers{uidIndex: uidIndexFunc})
aggregator.cnpListerSynced = cnpInformer.Informer().HasSynced
cnpInformer.Informer().AddEventHandlerWithResyncPeriod(
cache.ResourceEventHandlerFuncs{
AddFunc: aggregator.addCNP,
DeleteFunc: aggregator.deleteCNP,
},
// Set resyncPeriod to 0 to disable resyncing.
0,
)
aggregator.antreaNetworkPolicyStats = cache.NewIndexer(cache.MetaNamespaceKeyFunc, cache.Indexers{cache.NamespaceIndex: cache.MetaNamespaceIndexFunc, uidIndex: uidIndexFunc})
aggregator.anpListerSynced = anpInformer.Informer().HasSynced
anpInformer.Informer().AddEventHandlerWithResyncPeriod(
cache.ResourceEventHandlerFuncs{
AddFunc: aggregator.addANP,
DeleteFunc: aggregator.deleteANP,
},
// Set resyncPeriod to 0 to disable resyncing.
0,
)
}
if features.DefaultFeatureGate.Enabled(features.Multicast) {
aggregator.groupNodePodsMap = make(map[string]map[string][]statsv1alpha1.PodReference)
}
return aggregator
}
// addNetworkPolicy handles NetworkPolicy ADD events and creates corresponding NetworkPolicyStats objects.
func (a *Aggregator) addNetworkPolicy(obj interface{}) {
np := obj.(*networkingv1.NetworkPolicy)
stats := &statsv1alpha1.NetworkPolicyStats{
ObjectMeta: metav1.ObjectMeta{
Name: np.Name,
Namespace: np.Namespace,
UID: np.UID,
// To indicate the duration that the stats cover, the CreationTimestamp is set to the time that the stats
// start, instead of the CreationTimestamp of the NetworkPolicy.
CreationTimestamp: metav1.Time{Time: time.Now()},
},
}
a.networkPolicyStats.Add(stats)
}
// deleteNetworkPolicy handles NetworkPolicy DELETE events and deletes corresponding NetworkPolicyStats objects.
func (a *Aggregator) deleteNetworkPolicy(obj interface{}) {
np, ok := obj.(*networkingv1.NetworkPolicy)
if !ok {
tombstone, ok := obj.(cache.DeletedFinalStateUnknown)
if !ok {
klog.Errorf("Error decoding object when deleting NetworkPolicy, invalid type: %v", obj)
return
}
np, ok = tombstone.Obj.(*networkingv1.NetworkPolicy)
if !ok {
klog.Errorf("Error decoding object tombstone when deleting NetworkPolicy, invalid type: %v", tombstone.Obj)
return
}
}
stats := &statsv1alpha1.NetworkPolicyStats{
ObjectMeta: metav1.ObjectMeta{
Name: np.Name,
Namespace: np.Namespace,
UID: np.UID,
},
}
a.networkPolicyStats.Delete(stats)
}
// addCNP handles ClusterNetworkPolicy ADD events and creates corresponding ClusterNetworkPolicyStats objects.
func (a *Aggregator) addCNP(obj interface{}) {
cnp := obj.(*crdv1alpha1.ClusterNetworkPolicy)
stats := &statsv1alpha1.AntreaClusterNetworkPolicyStats{
ObjectMeta: metav1.ObjectMeta{
Name: cnp.Name,
UID: cnp.UID,
// To indicate the duration that the stats covers, the CreationTimestamp is set to the time that the stats
// start, instead of the CreationTimestamp of the ClusterNetworkPolicy.
CreationTimestamp: metav1.Time{Time: time.Now()},
},
}
a.antreaClusterNetworkPolicyStats.Add(stats)
}
// deleteCNP handles ClusterNetworkPolicy DELETE events and deletes corresponding ClusterNetworkPolicyStats objects.
func (a *Aggregator) deleteCNP(obj interface{}) {
cnp, ok := obj.(*crdv1alpha1.ClusterNetworkPolicy)
if !ok {
tombstone, ok := obj.(cache.DeletedFinalStateUnknown)
if !ok {
klog.Errorf("Error decoding object when deleting Antrea ClusterNetworkPolicy, invalid type: %v", obj)
return
}
cnp, ok = tombstone.Obj.(*crdv1alpha1.ClusterNetworkPolicy)
if !ok {
klog.Errorf("Error decoding object tombstone when deleting Antrea ClusterNetworkPolicy, invalid type: %v", tombstone.Obj)
return
}
}
stats := &statsv1alpha1.AntreaClusterNetworkPolicyStats{
ObjectMeta: metav1.ObjectMeta{
Name: cnp.Name,
UID: cnp.UID,
},
}
a.antreaClusterNetworkPolicyStats.Delete(stats)
}
// addANP handles Antrea NetworkPolicy ADD events and creates corresponding AntreaNetworkPolicyStats objects.
func (a *Aggregator) addANP(obj interface{}) {
anp := obj.(*crdv1alpha1.NetworkPolicy)
stats := &statsv1alpha1.AntreaNetworkPolicyStats{
ObjectMeta: metav1.ObjectMeta{
Namespace: anp.Namespace,
Name: anp.Name,
UID: anp.UID,
// To indicate the duration that the stats covers, the CreationTimestamp is set to the time that the stats
// start, instead of the CreationTimestamp of the Antrea NetworkPolicy.
CreationTimestamp: metav1.Time{Time: time.Now()},
},
}
a.antreaNetworkPolicyStats.Add(stats)
}
// deleteANP handles Antrea NetworkPolicy DELETE events and deletes corresponding AntreaNetworkPolicyStats objects.
func (a *Aggregator) deleteANP(obj interface{}) {
anp, ok := obj.(*crdv1alpha1.NetworkPolicy)
if !ok {
tombstone, ok := obj.(cache.DeletedFinalStateUnknown)
if !ok {
klog.Errorf("Error decoding object when deleting Antrea NetworkPolicy, invalid type: %v", obj)
return
}
anp, ok = tombstone.Obj.(*crdv1alpha1.NetworkPolicy)
if !ok {
klog.Errorf("Error decoding object tombstone when deleting Antrea NetworkPolicy, invalid type: %v", tombstone.Obj)
return
}
}
stats := &statsv1alpha1.AntreaNetworkPolicyStats{
ObjectMeta: metav1.ObjectMeta{
Namespace: anp.Namespace,
Name: anp.Name,
UID: anp.UID,
},
}
a.antreaNetworkPolicyStats.Delete(stats)
}
func (a *Aggregator) ListAntreaClusterNetworkPolicyStats() []statsv1alpha1.AntreaClusterNetworkPolicyStats {
objs := a.antreaClusterNetworkPolicyStats.List()
stats := make([]statsv1alpha1.AntreaClusterNetworkPolicyStats, len(objs))
for i, obj := range objs {
stats[i] = *(obj.(*statsv1alpha1.AntreaClusterNetworkPolicyStats))
}
return stats
}
func (a *Aggregator) ListMulticastGroups() []statsv1alpha1.MulticastGroup {
stats := make([]statsv1alpha1.MulticastGroup, 0, len(a.groupNodePodsMap))
a.groupNodePodsMapMutex.RLock()
defer a.groupNodePodsMapMutex.RUnlock()
for group, nodePods := range a.groupNodePodsMap {
allPods := make([]statsv1alpha1.PodReference, 0)
for _, pods := range nodePods {
allPods = append(allPods, pods...)
}
stats = append(stats, statsv1alpha1.MulticastGroup{ObjectMeta: metav1.ObjectMeta{Name: group}, Group: group, Pods: allPods})
}
return stats
}
func (a *Aggregator) GetMulticastGroup(group string) (*statsv1alpha1.MulticastGroup, bool) {
a.groupNodePodsMapMutex.RLock()
defer a.groupNodePodsMapMutex.RUnlock()
nodePods, exist := a.groupNodePodsMap[group]
if !exist {
return nil, false
}
allPods := make([]statsv1alpha1.PodReference, 0)
for _, pods := range nodePods {
allPods = append(allPods, pods...)
}
return &statsv1alpha1.MulticastGroup{ObjectMeta: metav1.ObjectMeta{Name: group}, Group: group, Pods: allPods}, true
}
func (a *Aggregator) GetAntreaClusterNetworkPolicyStats(name string) (*statsv1alpha1.AntreaClusterNetworkPolicyStats, bool) {
obj, exists, _ := a.antreaClusterNetworkPolicyStats.GetByKey(name)
if !exists {
return nil, false
}
return obj.(*statsv1alpha1.AntreaClusterNetworkPolicyStats), true
}
func (a *Aggregator) ListAntreaNetworkPolicyStats(namespace string) []statsv1alpha1.AntreaNetworkPolicyStats {
var objs []interface{}
if namespace == "" {
objs = a.antreaNetworkPolicyStats.List()
} else {
objs, _ = a.antreaNetworkPolicyStats.ByIndex(cache.NamespaceIndex, namespace)
}
stats := make([]statsv1alpha1.AntreaNetworkPolicyStats, len(objs))
for i, obj := range objs {
stats[i] = *(obj.(*statsv1alpha1.AntreaNetworkPolicyStats))
}
return stats
}
func (a *Aggregator) GetAntreaNetworkPolicyStats(namespace, name string) (*statsv1alpha1.AntreaNetworkPolicyStats, bool) {
obj, exists, _ := a.antreaNetworkPolicyStats.GetByKey(k8s.NamespacedName(namespace, name))
if !exists {
return nil, false
}
return obj.(*statsv1alpha1.AntreaNetworkPolicyStats), true
}
func (a *Aggregator) ListNetworkPolicyStats(namespace string) []statsv1alpha1.NetworkPolicyStats {
var objs []interface{}
if namespace == "" {
objs = a.networkPolicyStats.List()
} else {
objs, _ = a.networkPolicyStats.ByIndex(cache.NamespaceIndex, namespace)
}
stats := make([]statsv1alpha1.NetworkPolicyStats, len(objs))
for i, obj := range objs {
stats[i] = *(obj.(*statsv1alpha1.NetworkPolicyStats))
}
return stats
}
func (a *Aggregator) GetNetworkPolicyStats(namespace, name string) (*statsv1alpha1.NetworkPolicyStats, bool) {
obj, exists, _ := a.networkPolicyStats.GetByKey(k8s.NamespacedName(namespace, name))
if !exists {
return nil, false
}
return obj.(*statsv1alpha1.NetworkPolicyStats), true
}
// Collect collects the node summary asynchronously to avoid the competition for the statsLock and to save clients
// from pending on it.
func (a *Aggregator) Collect(summary *controlplane.NodeStatsSummary) {
a.dataCh <- summary
}
// Run runs a loop that keeps taking stats summary from the data channel and actually collecting them until the
// provided stop channel is closed.
func (a *Aggregator) Run(stopCh <-chan struct{}) {
klog.Info("Starting stats aggregator")
defer klog.Info("Shutting down stats aggregator")
cacheSyncs := []cache.InformerSynced{a.npListerSynced}
if features.DefaultFeatureGate.Enabled(features.AntreaPolicy) {
cacheSyncs = append(cacheSyncs, a.cnpListerSynced, a.anpListerSynced)
}
if !cache.WaitForNamedCacheSync("stats aggregator", stopCh, cacheSyncs...) {
return
}
for {
select {
case summary := <-a.dataCh:
a.doCollect(summary)
case <-stopCh:
return
}
}
}
func (a *Aggregator) doCollect(summary *controlplane.NodeStatsSummary) {
for _, stats := range summary.NetworkPolicies {
// The policy might have been removed, skip processing it if missing.
objs, _ := a.networkPolicyStats.ByIndex(uidIndex, string(stats.NetworkPolicy.UID))
if len(objs) > 0 {
// The object returned by cache is supposed to be read only, create a new object and update it.
curStats := objs[0].(*statsv1alpha1.NetworkPolicyStats).DeepCopy()
addUp(&curStats.TrafficStats, &stats.TrafficStats)
a.networkPolicyStats.Update(curStats)
}
}
if features.DefaultFeatureGate.Enabled(features.Multicast) {
reportedGroups := sets.NewString()
a.groupNodePodsMapMutex.Lock()
for _, mcastGroupInfo := range summary.Multicast {
group := mcastGroupInfo.Group
reportedGroups.Insert(group)
_, exist := a.groupNodePodsMap[group]
if !exist {
a.groupNodePodsMap[group] = make(map[string][]statsv1alpha1.PodReference)
}
statsv1alpha1Pods := make([]statsv1alpha1.PodReference, 0, len(mcastGroupInfo.Pods))
for _, pod := range mcastGroupInfo.Pods {
statsv1alpha1Pods = append(statsv1alpha1Pods, statsv1alpha1.PodReference{Name: pod.Name, Namespace: pod.Namespace})
}
a.groupNodePodsMap[group][summary.ObjectMeta.Name] = statsv1alpha1Pods
}
for group := range a.groupNodePodsMap {
// The antrea-agent reports full mcastGroupInfo to the controller, if the group is unreported,
// then this group has no Pod joined in this Node.
if !reportedGroups.Has(group) {
delete(a.groupNodePodsMap[group], summary.ObjectMeta.Name)
if len(a.groupNodePodsMap[group]) == 0 {
delete(a.groupNodePodsMap, group)
}
}
}
a.groupNodePodsMapMutex.Unlock()
}
if features.DefaultFeatureGate.Enabled(features.AntreaPolicy) {
for _, stats := range summary.AntreaClusterNetworkPolicies {
// The policy have might been removed, skip processing it if missing.
objs, _ := a.antreaClusterNetworkPolicyStats.ByIndex(uidIndex, string(stats.NetworkPolicy.UID))
if len(objs) > 0 {
// The object returned by cache is supposed to be read only, create a new object and update it.
curStats := objs[0].(*statsv1alpha1.AntreaClusterNetworkPolicyStats).DeepCopy()
// antrea agents may not be updated and still use TrafficStats to collect overall networkpolicy
if stats.TrafficStats.Bytes > 0 {
addUp(&curStats.TrafficStats, &stats.TrafficStats)
} else {
addRulesUp(&curStats.RuleTrafficStats, &curStats.TrafficStats, stats.RuleTrafficStats)
}
a.antreaClusterNetworkPolicyStats.Update(curStats)
}
}
for _, stats := range summary.AntreaNetworkPolicies {
// The policy have might been removed, skip processing it if missing.
objs, _ := a.antreaNetworkPolicyStats.ByIndex(uidIndex, string(stats.NetworkPolicy.UID))
if len(objs) > 0 {
// The object returned by cache is supposed to be read only, create a new object and update it.
curStats := objs[0].(*statsv1alpha1.AntreaNetworkPolicyStats).DeepCopy()
// antrea agents may not be updated and still use TrafficStats to collect overall networkpolicy
if stats.TrafficStats.Bytes > 0 {
addUp(&curStats.TrafficStats, &stats.TrafficStats)
} else {
addRulesUp(&curStats.RuleTrafficStats, &curStats.TrafficStats, stats.RuleTrafficStats)
}
a.antreaNetworkPolicyStats.Update(curStats)
}
}
}
}
func addUp(stats *statsv1alpha1.TrafficStats, inc *statsv1alpha1.TrafficStats) {
stats.Sessions += inc.Sessions
stats.Packets += inc.Packets
stats.Bytes += inc.Bytes
}
func addRulesUp(ruleStats *[]statsv1alpha1.RuleTrafficStats, ruleSumStats *statsv1alpha1.TrafficStats, inc []statsv1alpha1.RuleTrafficStats) {
incMap := make(map[string]*statsv1alpha1.TrafficStats)
for i, v := range inc {
incMap[v.Name] = &inc[i].TrafficStats
}
// accumulate incMap traffics stats to the current traffic stats
for _, v := range incMap {
addUp(ruleSumStats, v)
}
// accumulate the rule traffic stats as the rule has already 'existed' in the ruleStats
for i, v := range *ruleStats {
stats, exist := incMap[v.Name]
if exist {
(*ruleStats)[i].TrafficStats = statsv1alpha1.TrafficStats{
Packets: v.TrafficStats.Packets + stats.Packets,
Bytes: v.TrafficStats.Bytes + stats.Bytes,
Sessions: v.TrafficStats.Sessions + stats.Sessions,
}
}
delete(incMap, v.Name)
}
// convert remaining incs to RuleTrafficStats and add it to current traffic stats
for k, v := range incMap {
rs := statsv1alpha1.RuleTrafficStats{
Name: k,
TrafficStats: *v,
}
*ruleStats = append(*ruleStats, rs)
}
}