95 lines
2.4 KiB
Go
95 lines
2.4 KiB
Go
/*
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Copyright 2021 The cert-manager 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 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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"fmt"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/runtime/serializer"
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)
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// Plugins manages initialising, registering and executing admission plugins
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// for both validation and mutation.
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type Plugins struct {
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decoder runtime.Decoder
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pluginFactory map[string]Factory
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}
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func NewPlugins(scheme *runtime.Scheme) *Plugins {
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return &Plugins{
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decoder: serializer.NewCodecFactory(scheme).UniversalDecoder(),
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pluginFactory: make(map[string]Factory),
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}
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}
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func (ps *Plugins) Register(name string, factory Factory) {
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ps.pluginFactory[name] = factory
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}
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func (ps *Plugins) NewFromPlugins(names []string, pluginInitializer PluginInitializer) (Interface, error) {
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var plugins []Interface
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for _, pluginName := range names {
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plugin, err := ps.InitPlugin(pluginName, pluginInitializer)
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if err != nil {
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return nil, err
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}
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plugins = append(plugins, plugin)
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}
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return PluginChain(plugins), nil
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}
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func (ps *Plugins) getPlugin(name string) (Interface, bool, error) {
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f, ok := ps.pluginFactory[name]
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if !ok {
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return nil, false, nil
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}
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plugin, err := f()
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return plugin, true, err
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}
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func (ps *Plugins) InitPlugin(name string, pluginInitializer PluginInitializer) (Interface, error) {
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plugin, found, err := ps.getPlugin(name)
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if err != nil {
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return nil, err
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}
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if !found {
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return nil, fmt.Errorf("No plugin named %q registered", name)
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}
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pluginInitializer.Initialize(plugin)
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if err := ValidateInitialization(plugin); err != nil {
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return nil, err
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}
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return plugin, nil
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}
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// ValidateInitialization will call the InitializationValidate function in each plugin if they implement
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// the InitializationValidator interface.
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func ValidateInitialization(plugin Interface) error {
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if validater, ok := plugin.(InitializationValidator); ok {
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err := validater.ValidateInitialization()
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if err != nil {
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return err
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}
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}
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return nil
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}
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