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accessor.go
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accessor.go
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package clusterresourcequota
import (
"time"
lru "github.com/hashicorp/golang-lru"
"k8s.io/apimachinery/pkg/api/equality"
kapierrors "k8s.io/apimachinery/pkg/api/errors"
utilwait "k8s.io/apimachinery/pkg/util/wait"
etcd "k8s.io/apiserver/pkg/storage/etcd"
kapi "k8s.io/kubernetes/pkg/api"
kcorelisters "k8s.io/kubernetes/pkg/client/listers/core/internalversion"
utilquota "k8s.io/kubernetes/pkg/quota"
quotaapi "github.com/openshift/origin/pkg/quota/apis/quota"
"github.com/openshift/origin/pkg/quota/controller/clusterquotamapping"
quotatypedclient "github.com/openshift/origin/pkg/quota/generated/internalclientset/typed/quota/internalversion"
quotalister "github.com/openshift/origin/pkg/quota/generated/listers/quota/internalversion"
)
type clusterQuotaAccessor struct {
clusterQuotaLister quotalister.ClusterResourceQuotaLister
namespaceLister kcorelisters.NamespaceLister
clusterQuotaClient quotatypedclient.ClusterResourceQuotasGetter
clusterQuotaMapper clusterquotamapping.ClusterQuotaMapper
// updatedClusterQuotas holds a cache of quotas that we've updated. This is used to pull the "really latest" during back to
// back quota evaluations that touch the same quota doc. This only works because we can compare etcd resourceVersions
// for the same resource as integers. Before this change: 22 updates with 12 conflicts. after this change: 15 updates with 0 conflicts
updatedClusterQuotas *lru.Cache
}
// newQuotaAccessor creates an object that conforms to the QuotaAccessor interface to be used to retrieve quota objects.
func newQuotaAccessor(
clusterQuotaLister quotalister.ClusterResourceQuotaLister,
namespaceLister kcorelisters.NamespaceLister,
clusterQuotaClient quotatypedclient.ClusterResourceQuotasGetter,
clusterQuotaMapper clusterquotamapping.ClusterQuotaMapper,
) *clusterQuotaAccessor {
updatedCache, err := lru.New(100)
if err != nil {
// this should never happen
panic(err)
}
return &clusterQuotaAccessor{
clusterQuotaLister: clusterQuotaLister,
namespaceLister: namespaceLister,
clusterQuotaClient: clusterQuotaClient,
clusterQuotaMapper: clusterQuotaMapper,
updatedClusterQuotas: updatedCache,
}
}
// UpdateQuotaStatus the newQuota coming in will be incremented from the original. The difference between the original
// and the new is the amount to add to the namespace total, but the total status is the used value itself
func (e *clusterQuotaAccessor) UpdateQuotaStatus(newQuota *kapi.ResourceQuota) error {
clusterQuota, err := e.clusterQuotaLister.Get(newQuota.Name)
if err != nil {
return err
}
clusterQuota = e.checkCache(clusterQuota)
// make a copy
obj, err := kapi.Scheme.Copy(clusterQuota)
if err != nil {
return err
}
// re-assign objectmeta
clusterQuota = obj.(*quotaapi.ClusterResourceQuota)
clusterQuota.ObjectMeta = newQuota.ObjectMeta
clusterQuota.Namespace = ""
// determine change in usage
usageDiff := utilquota.Subtract(newQuota.Status.Used, clusterQuota.Status.Total.Used)
// update aggregate usage
clusterQuota.Status.Total.Used = newQuota.Status.Used
// update per namespace totals
oldNamespaceTotals, _ := clusterQuota.Status.Namespaces.Get(newQuota.Namespace)
namespaceTotalCopy, err := kapi.Scheme.DeepCopy(oldNamespaceTotals)
if err != nil {
return err
}
newNamespaceTotals := namespaceTotalCopy.(kapi.ResourceQuotaStatus)
newNamespaceTotals.Used = utilquota.Add(oldNamespaceTotals.Used, usageDiff)
clusterQuota.Status.Namespaces.Insert(newQuota.Namespace, newNamespaceTotals)
updatedQuota, err := e.clusterQuotaClient.ClusterResourceQuotas().UpdateStatus(clusterQuota)
if err != nil {
return err
}
e.updatedClusterQuotas.Add(clusterQuota.Name, updatedQuota)
return nil
}
var etcdVersioner = etcd.APIObjectVersioner{}
// checkCache compares the passed quota against the value in the look-aside cache and returns the newer
// if the cache is out of date, it deletes the stale entry. This only works because of etcd resourceVersions
// being monotonically increasing integers
func (e *clusterQuotaAccessor) checkCache(clusterQuota *quotaapi.ClusterResourceQuota) *quotaapi.ClusterResourceQuota {
uncastCachedQuota, ok := e.updatedClusterQuotas.Get(clusterQuota.Name)
if !ok {
return clusterQuota
}
cachedQuota := uncastCachedQuota.(*quotaapi.ClusterResourceQuota)
if etcdVersioner.CompareResourceVersion(clusterQuota, cachedQuota) >= 0 {
e.updatedClusterQuotas.Remove(clusterQuota.Name)
return clusterQuota
}
return cachedQuota
}
func (e *clusterQuotaAccessor) GetQuotas(namespaceName string) ([]kapi.ResourceQuota, error) {
clusterQuotaNames, err := e.waitForReadyClusterQuotaNames(namespaceName)
if err != nil {
return nil, err
}
resourceQuotas := []kapi.ResourceQuota{}
for _, clusterQuotaName := range clusterQuotaNames {
clusterQuota, err := e.clusterQuotaLister.Get(clusterQuotaName)
if kapierrors.IsNotFound(err) {
continue
}
if err != nil {
return nil, err
}
clusterQuota = e.checkCache(clusterQuota)
// now convert to a ResourceQuota
convertedQuota := kapi.ResourceQuota{}
convertedQuota.ObjectMeta = clusterQuota.ObjectMeta
convertedQuota.Namespace = namespaceName
convertedQuota.Spec = clusterQuota.Spec.Quota
convertedQuota.Status = clusterQuota.Status.Total
resourceQuotas = append(resourceQuotas, convertedQuota)
}
return resourceQuotas, nil
}
func (e *clusterQuotaAccessor) waitForReadyClusterQuotaNames(namespaceName string) ([]string, error) {
var clusterQuotaNames []string
// wait for a valid mapping cache. The overall response can be delayed for up to 10 seconds.
err := utilwait.PollImmediate(100*time.Millisecond, 8*time.Second, func() (done bool, err error) {
var namespaceSelectionFields clusterquotamapping.SelectionFields
clusterQuotaNames, namespaceSelectionFields = e.clusterQuotaMapper.GetClusterQuotasFor(namespaceName)
namespace, err := e.namespaceLister.Get(namespaceName)
if err != nil {
return false, err
}
if equality.Semantic.DeepEqual(namespaceSelectionFields, clusterquotamapping.GetSelectionFields(namespace)) {
return true, nil
}
return false, nil
})
return clusterQuotaNames, err
}