mirror of https://github.com/knative/caching.git
82 lines
2.2 KiB
Go
82 lines
2.2 KiB
Go
/*
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Copyright 2019 The Knative 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 requ ired 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 psbinding
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import "k8s.io/apimachinery/pkg/labels"
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// exactKey is the type for keys that match exactly.
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type exactKey struct {
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Group string
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Kind string
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Namespace string
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Name string
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}
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// exactMatcher is our reverse index from subjects to the Bindings that apply to
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// them.
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type exactMatcher map[exactKey]Bindable
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// Add writes a key into the reverse index.
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func (em exactMatcher) Add(key exactKey, b Bindable) {
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em[key] = b
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}
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// Get fetches the key from the reverse index, if present.
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func (em exactMatcher) Get(key exactKey) (bindable Bindable, present bool) {
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b, ok := em[key]
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return b, ok
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}
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// inexactKey is the type for keys that match inexactly (via selector)
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type inexactKey struct {
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Group string
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Kind string
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Namespace string
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}
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// pair holds selectors and bindables for a particular inexactKey.
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type pair struct {
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selector labels.Selector
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sb Bindable
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}
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// inexactMatcher is our reverse index from subjects to the Bindings that apply to
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// them.
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type inexactMatcher map[inexactKey][]pair
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// Add writes a key into the reverse index.
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func (im inexactMatcher) Add(key inexactKey, selector labels.Selector, b Bindable) {
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pl := im[key]
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pl = append(pl, pair{
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selector: selector,
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sb: b,
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})
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im[key] = pl
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}
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// Get fetches the key from the reverse index, if present.
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func (im inexactMatcher) Get(key inexactKey, ls labels.Set) (bindable Bindable, present bool) {
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// Iterate over the list of pairs matched for this GK + namespace and return the first
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// Bindable that matches our selector.
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for _, p := range im[key] {
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if p.selector.Matches(ls) {
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return p.sb, true
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}
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}
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return nil, false
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}
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