82 lines
3 KiB
Go
82 lines
3 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package quota
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import (
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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/apiserver/pkg/admission"
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"k8s.io/kubernetes/pkg/api"
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)
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// UsageStatsOptions is an options structs that describes how stats should be calculated
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type UsageStatsOptions struct {
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// Namespace where stats should be calculate
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Namespace string
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// Scopes that must match counted objects
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Scopes []api.ResourceQuotaScope
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// Resources are the set of resources to include in the measurement
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Resources []api.ResourceName
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}
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// UsageStats is result of measuring observed resource use in the system
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type UsageStats struct {
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// Used maps resource to quantity used
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Used api.ResourceList
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}
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// Evaluator knows how to evaluate quota usage for a particular group kind
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type Evaluator interface {
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// Constraints ensures that each required resource is present on item
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Constraints(required []api.ResourceName, item runtime.Object) error
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// GroupKind returns the groupKind that this object knows how to evaluate
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GroupKind() schema.GroupKind
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// Handles determines if quota could be impacted by the specified operation.
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// If true, admission control must perform quota processing for the operation, otherwise it is safe to ignore quota.
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Handles(operation admission.Operation) bool
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// Matches returns true if the specified quota matches the input item
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Matches(resourceQuota *api.ResourceQuota, item runtime.Object) (bool, error)
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// MatchingResources takes the input specified list of resources and returns the set of resources evaluator matches.
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MatchingResources(input []api.ResourceName) []api.ResourceName
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// Usage returns the resource usage for the specified object
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Usage(item runtime.Object) (api.ResourceList, error)
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// UsageStats calculates latest observed usage stats for all objects
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UsageStats(options UsageStatsOptions) (UsageStats, error)
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}
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// Registry holds the list of evaluators associated to a particular group kind
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type Registry interface {
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// Evaluators returns the set Evaluator objects registered to a groupKind
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Evaluators() map[schema.GroupKind]Evaluator
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}
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// UnionRegistry combines multiple registries. Order matters because first registry to claim a GroupKind
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// is the "winner"
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type UnionRegistry []Registry
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// Evaluators returns a mapping of evaluators by group kind.
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func (r UnionRegistry) Evaluators() map[schema.GroupKind]Evaluator {
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ret := map[schema.GroupKind]Evaluator{}
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for i := len(r) - 1; i >= 0; i-- {
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for k, v := range r[i].Evaluators() {
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ret[k] = v
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}
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}
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return ret
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}
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