mirror of
https://github.com/optim-enterprises-bv/kubernetes.git
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112 lines
3.0 KiB
Go
112 lines
3.0 KiB
Go
/*
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Copyright 2014 The Kubernetes Authors All rights reserved.
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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 admission
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import (
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"io"
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"os"
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"sort"
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"sync"
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"github.com/golang/glog"
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clientset "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset"
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)
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// Factory is a function that returns an Interface for admission decisions.
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// The config parameter provides an io.Reader handler to the factory in
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// order to load specific configurations. If no configuration is provided
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// the parameter is nil.
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type Factory func(client clientset.Interface, config io.Reader) (Interface, error)
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// All registered admission options.
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var (
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pluginsMutex sync.Mutex
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plugins = make(map[string]Factory)
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)
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// GetPlugins enumerates the names of all registered plugins.
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func GetPlugins() []string {
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pluginsMutex.Lock()
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defer pluginsMutex.Unlock()
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keys := []string{}
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for k := range plugins {
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keys = append(keys, k)
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}
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sort.Strings(keys)
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return keys
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}
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// RegisterPlugin registers a plugin Factory by name. This
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// is expected to happen during app startup.
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func RegisterPlugin(name string, plugin Factory) {
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pluginsMutex.Lock()
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defer pluginsMutex.Unlock()
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_, found := plugins[name]
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if found {
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glog.Fatalf("Admission plugin %q was registered twice", name)
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}
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glog.V(1).Infof("Registered admission plugin %q", name)
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plugins[name] = plugin
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}
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// GetPlugin creates an instance of the named plugin, or nil if the name is not
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// known. The error is returned only when the named provider was known but failed
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// to initialize. The config parameter specifies the io.Reader handler of the
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// configuration file for the cloud provider, or nil for no configuration.
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func GetPlugin(name string, client clientset.Interface, config io.Reader) (Interface, error) {
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pluginsMutex.Lock()
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defer pluginsMutex.Unlock()
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f, found := plugins[name]
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if !found {
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return nil, nil
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}
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return f(client, config)
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}
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// InitPlugin creates an instance of the named interface.
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func InitPlugin(name string, client clientset.Interface, configFilePath string) Interface {
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var (
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config *os.File
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err error
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)
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if name == "" {
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glog.Info("No admission plugin specified.")
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return nil
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}
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if configFilePath != "" {
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config, err = os.Open(configFilePath)
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if err != nil {
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glog.Fatalf("Couldn't open admission plugin configuration %s: %#v",
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configFilePath, err)
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}
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defer config.Close()
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}
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plugin, err := GetPlugin(name, client, config)
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if err != nil {
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glog.Fatalf("Couldn't init admission plugin %q: %v", name, err)
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}
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if plugin == nil {
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glog.Fatalf("Unknown admission plugin: %s", name)
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}
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return plugin
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}
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