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registry.go
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registry.go
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/*
* Copyright 2019 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
*
* 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
*
* http://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
*
*/
package access
import (
"fmt"
"sync"
"github.com/gardener/controller-manager-library/pkg/logger"
)
var (
lock sync.RWMutex
entries = []*entry{}
)
type entry struct {
priority int
clusters map[string][]AccessController
}
func (this *entry) forCluster(clusterId string) []AccessController {
list := this.clusters[clusterId]
global := this.clusters[""]
if list != nil {
if global != nil {
return append(append([]AccessController{}, list...), global...)
}
return list
}
return global
}
func Register(ctr AccessController, clusterId string, priority int) {
if priority > MIN_PRIO || priority < MAX_PRIO {
panic(fmt.Errorf("invalid access controller priority %d for %q", priority, ctr.Name()))
}
lock.Lock()
defer lock.Unlock()
if clusterId == "" {
logger.Infof("registering global access controller %q with priority %d", ctr.Name(), priority)
} else {
logger.Infof("registering access controller %q for cluster %q with priority %d", ctr.Name(), clusterId, priority)
}
var found *entry
for i, e := range entries {
if e.priority == priority {
found = e
break
}
if e.priority > priority {
found = &entry{priority, map[string][]AccessController{}}
entries = append(entries[:i], append([]*entry{found}, entries[i:]...)...)
break
}
}
if found == nil {
found = &entry{priority, map[string][]AccessController{}}
entries = append(entries, found)
}
found.clusters[clusterId] = append(found.clusters[clusterId], ctr)
}