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podregistry.go
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podregistry.go
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// Copyright 2017 Google Inc.
//
// 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
//
// https://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 main
import "sync"
type pod struct{ name, namespace string }
type podRegistry struct {
mu sync.RWMutex
imgToPod map[string]map[pod]struct{}
podToImg map[pod]map[string]struct{}
}
func newRegistry() *podRegistry {
return &podRegistry{
imgToPod: make(map[string]map[pod]struct{}),
podToImg: make(map[pod]map[string]struct{}),
}
}
// add registers that pod uses the specified image. It can be called multiple
// times with different image values to register images of multiple containers
// of the same pod.
func (r *podRegistry) add(p pod, image string) {
r.mu.Lock()
if _, ok := r.imgToPod[image]; !ok {
r.imgToPod[image] = make(map[pod]struct{})
}
r.imgToPod[image][p] = struct{}{}
if _, ok := r.podToImg[p]; !ok {
r.podToImg[p] = make(map[string]struct{})
}
r.podToImg[p][image] = struct{}{}
r.mu.Unlock()
}
// del unregisters that the pod is using the specified image. It can be multiple
// times with different images to unregister images of multiple containers of
// the same pod.
func (r *podRegistry) del(p pod, image string) {
r.mu.Lock()
delete(r.imgToPod[image], p)
if len(r.imgToPod[image]) == 0 {
delete(r.imgToPod, image)
}
delete(r.podToImg[p], image)
if len(r.podToImg[p]) == 0 {
delete(r.podToImg, p)
}
r.mu.Unlock()
}
// get retrieves list of pods running the image.
func (r *podRegistry) get(image string) []pod {
r.mu.RLock()
out := make([]pod, len(r.imgToPod[image]))
var i int
for p := range r.imgToPod[image] {
out[i] = p
i++
}
r.mu.RUnlock()
return out
}