104 lines
2.8 KiB
Go
104 lines
2.8 KiB
Go
/*
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Copyright 2022 The Karmada 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 runtime
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import (
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"fmt"
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"strings"
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"k8s.io/apimachinery/pkg/util/sets"
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"k8s.io/klog/v2"
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"github.com/karmada-io/karmada/pkg/scheduler/framework"
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)
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// PluginFactory is a function that builds a plugin.
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type PluginFactory = func() (framework.Plugin, error)
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// Registry is a collection of all available plugins. The framework uses a
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// registry to enable and initialize configured plugins.
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// All plugins must be in the registry before initializing the framework.
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type Registry map[string]PluginFactory
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// Register adds a new plugin to the registry. If a plugin with the same name
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// exists, it returns an error.
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func (r Registry) Register(name string, factory PluginFactory) error {
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if _, ok := r[name]; ok {
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return fmt.Errorf("a plugin named %v already exists", name)
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}
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r[name] = factory
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return nil
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}
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// Unregister removes an existing plugin from the registry. If no plugin with
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// the provided name exists, it returns an error.
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func (r Registry) Unregister(name string) error {
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if _, ok := r[name]; !ok {
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return fmt.Errorf("no plugin named %v exists", name)
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}
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delete(r, name)
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return nil
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}
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// Merge merges the provided registry to the current one.
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func (r Registry) Merge(in Registry) error {
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for name, factory := range in {
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if err := r.Register(name, factory); 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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// FactoryNames returns all known plugin names
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func (r Registry) FactoryNames() []string {
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return sets.StringKeySet(r).List()
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}
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// Filter out the disabled plugin
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func (r Registry) Filter(names []string) Registry {
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var retRegistry = make(Registry)
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for _, name := range names {
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// --plugins=*
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if name == "*" {
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for factoryName, factory := range r {
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klog.Infof("Enable Scheduler plugin %q", factoryName)
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retRegistry[factoryName] = factory
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}
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break
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}
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}
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for _, name := range names {
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// --plugins=foo
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if factory, ok := r[name]; ok {
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retRegistry[name] = factory
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klog.Infof("Enable Scheduler plugin %q", name)
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continue
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}
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// --plugins=*,-foo
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// --plugins=-foo,*
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if strings.HasPrefix(name, "-") && len(retRegistry) > 0 {
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factoryName := strings.TrimLeft(name, "-")
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delete(retRegistry, factoryName)
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klog.Warningf("%q is disabled", factoryName)
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}
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}
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return retRegistry
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}
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