139 lines
4.0 KiB
Go
139 lines
4.0 KiB
Go
/*
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Copyright 2022 The Kubernetes 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 plugin
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import (
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"errors"
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"fmt"
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"strings"
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utilversion "k8s.io/apimachinery/pkg/util/version"
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"k8s.io/klog/v2"
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)
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const (
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// DRAPluginName is the name of the in-tree DRA Plugin.
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DRAPluginName = "kubernetes.io/dra"
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)
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// draPlugins map keeps track of all registered DRA plugins on the node
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// and their corresponding sockets.
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var draPlugins = &PluginsStore{}
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// RegistrationHandler is the handler which is fed to the pluginwatcher API.
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type RegistrationHandler struct{}
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// NewPluginHandler returns new registration handler.
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func NewRegistrationHandler() *RegistrationHandler {
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return &RegistrationHandler{}
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}
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// RegisterPlugin is called when a plugin can be registered.
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func (h *RegistrationHandler) RegisterPlugin(pluginName string, endpoint string, versions []string) error {
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klog.InfoS("Register new DRA plugin", "name", pluginName, "endpoint", endpoint)
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highestSupportedVersion, err := h.validateVersions("RegisterPlugin", pluginName, versions)
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if err != nil {
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return err
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}
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// Storing endpoint of newly registered DRA Plugin into the map, where plugin name will be the key
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// all other DRA components will be able to get the actual socket of DRA plugins by its name.
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draPlugins.Set(pluginName, &Plugin{
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conn: nil,
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endpoint: endpoint,
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highestSupportedVersion: highestSupportedVersion,
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})
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return nil
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}
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func (h *RegistrationHandler) validateVersions(
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callerName string,
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pluginName string,
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versions []string,
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) (*utilversion.Version, error) {
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if len(versions) == 0 {
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return nil, errors.New(
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log(
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"%s for DRA plugin %q failed. Plugin returned an empty list for supported versions",
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callerName,
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pluginName,
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),
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)
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}
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// Validate version
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newPluginHighestVersion, err := utilversion.HighestSupportedVersion(versions)
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if err != nil {
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return nil, errors.New(
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log(
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"%s for DRA plugin %q failed. None of the versions specified %q are supported. err=%v",
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callerName,
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pluginName,
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versions,
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err,
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),
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)
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}
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existingPlugin := draPlugins.Get(pluginName)
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if existingPlugin != nil {
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if !existingPlugin.highestSupportedVersion.LessThan(newPluginHighestVersion) {
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return nil, errors.New(
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log(
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"%s for DRA plugin %q failed. Another plugin with the same name is already registered with a higher supported version: %q",
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callerName,
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pluginName,
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existingPlugin.highestSupportedVersion,
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),
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)
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}
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}
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return newPluginHighestVersion, nil
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}
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func unregisterPlugin(pluginName string) {
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draPlugins.Delete(pluginName)
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}
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// DeRegisterPlugin is called when a plugin has removed its socket,
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// signaling it is no longer available.
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func (h *RegistrationHandler) DeRegisterPlugin(pluginName string) {
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klog.InfoS("DeRegister DRA plugin", "name", pluginName)
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unregisterPlugin(pluginName)
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}
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// ValidatePlugin is called by kubelet's plugin watcher upon detection
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// of a new registration socket opened by DRA plugin.
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func (h *RegistrationHandler) ValidatePlugin(pluginName string, endpoint string, versions []string) error {
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klog.InfoS("Validate DRA plugin", "name", pluginName, "endpoint", endpoint, "versions", strings.Join(versions, ","))
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_, err := h.validateVersions("ValidatePlugin", pluginName, versions)
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if err != nil {
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return fmt.Errorf("validation failed for DRA plugin %s at endpoint %s: %+v", pluginName, endpoint, err)
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}
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return err
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}
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// log prepends log string with `kubernetes.io/dra`.
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func log(msg string, parts ...interface{}) string {
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return fmt.Sprintf(fmt.Sprintf("%s: %s", DRAPluginName, msg), parts...)
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}
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