mirror of
https://github.com/k3s-io/kubernetes.git
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127 lines
3.7 KiB
Go
127 lines
3.7 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 util
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import (
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"k8s.io/kubernetes/pkg/api/unversioned"
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"k8s.io/kubernetes/pkg/apimachinery/registered"
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client "k8s.io/kubernetes/pkg/client/unversioned"
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"k8s.io/kubernetes/pkg/client/unversioned/clientcmd"
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)
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func NewClientCache(loader clientcmd.ClientConfig) *ClientCache {
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return &ClientCache{
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clients: make(map[unversioned.GroupVersion]*client.Client),
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configs: make(map[unversioned.GroupVersion]*client.Config),
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loader: loader,
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}
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}
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// ClientCache caches previously loaded clients for reuse, and ensures MatchServerVersion
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// is invoked only once
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type ClientCache struct {
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loader clientcmd.ClientConfig
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clients map[unversioned.GroupVersion]*client.Client
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configs map[unversioned.GroupVersion]*client.Config
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defaultConfig *client.Config
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defaultClient *client.Client
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matchVersion bool
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}
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// ClientConfigForVersion returns the correct config for a server
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func (c *ClientCache) ClientConfigForVersion(version *unversioned.GroupVersion) (*client.Config, error) {
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if c.defaultConfig == nil {
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config, err := c.loader.ClientConfig()
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if err != nil {
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return nil, err
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}
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c.defaultConfig = config
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if c.matchVersion {
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if err := client.MatchesServerVersion(c.defaultClient, config); err != nil {
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return nil, err
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}
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}
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}
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if version != nil {
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if config, ok := c.configs[*version]; ok {
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return config, nil
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}
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}
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// TODO: have a better config copy method
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config := *c.defaultConfig
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// TODO these fall out when we finish the refactor
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var preferredGV *unversioned.GroupVersion
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if version != nil {
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versionCopy := *version
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preferredGV = &versionCopy
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}
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negotiatedVersion, err := client.NegotiateVersion(c.defaultClient, &config, preferredGV, registered.EnabledVersions())
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if err != nil {
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return nil, err
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}
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config.GroupVersion = negotiatedVersion
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client.SetKubernetesDefaults(&config)
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if version != nil {
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c.configs[*version] = &config
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}
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// `version` does not necessarily equal `config.Version`. However, we know that we call this method again with
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// `config.Version`, we should get the the config we've just built.
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configCopy := config
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c.configs[*config.GroupVersion] = &configCopy
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return &config, nil
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}
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// ClientForVersion initializes or reuses a client for the specified version, or returns an
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// error if that is not possible
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func (c *ClientCache) ClientForVersion(version *unversioned.GroupVersion) (*client.Client, error) {
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if version != nil {
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if client, ok := c.clients[*version]; ok {
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return client, nil
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}
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}
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config, err := c.ClientConfigForVersion(version)
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if err != nil {
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return nil, err
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}
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kubeclient, err := client.New(config)
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if err != nil {
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return nil, err
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}
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c.clients[*config.GroupVersion] = kubeclient
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// `version` does not necessarily equal `config.Version`. However, we know that if we call this method again with
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// `version`, we should get a client based on the same config we just found. There's no guarantee that a client
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// is copiable, so create a new client and save it in the cache.
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if version != nil {
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configCopy := *config
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kubeclient, err := client.New(&configCopy)
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if err != nil {
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return nil, err
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}
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c.clients[*version] = kubeclient
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}
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return kubeclient, nil
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}
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