quota

type Configuration interface {
	// IgnoredResources are ignored by quota.
	IgnoredResources() map[schema.GroupResource]struct{}
	// Evaluators for quota evaluation.
	Evaluators() []Evaluator
}

type Evaluator interface {
	// Constraints ensures that each required resource is present on item
	Constraints(required []api.ResourceName, item runtime.Object) error
	// GroupResource returns the groupResource that this object knows how to evaluate
	GroupResource() schema.GroupResource
	// Handles determines if quota could be impacted by the specified attribute.
	// If true, admission control must perform quota processing for the operation, otherwise it is safe to ignore quota.
	Handles(operation admission.Attributes) bool
	// Matches returns true if the specified quota matches the input item
	Matches(resourceQuota *api.ResourceQuota, item runtime.Object) (bool, error)
	// MatchingResources takes the input specified list of resources and returns the set of resources evaluator matches.
	MatchingResources(input []api.ResourceName) []api.ResourceName
	// Usage returns the resource usage for the specified object
	Usage(item runtime.Object) (api.ResourceList, error)
	// UsageStats calculates latest observed usage stats for all objects
	UsageStats(options UsageStatsOptions) (UsageStats, error)
}

type ListerForResourceFunc func(schema.GroupVersionResource) (cache.GenericLister, error)

type Registry interface {
	// Add to registry
	Add(e Evaluator)
	// Remove from registry
	Remove(e Evaluator)
	// Get by group resource
	Get(gr schema.GroupResource) Evaluator
	// List from registry
	List() []Evaluator
}

type UsageStats struct {
	// Used maps resource to quantity used
	Used api.ResourceList
}

type UsageStatsOptions struct {
	// Namespace where stats should be calculate
	Namespace string
	// Scopes that must match counted objects
	Scopes []api.ResourceQuotaScope
	// Resources are the set of resources to include in the measurement
	Resources []api.ResourceName
}