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clientcache.go
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clientcache.go
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/*
Copyright 2014 The Kubernetes Authors All rights reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package util
import (
"k8s.io/kubernetes/pkg/api/unversioned"
"k8s.io/kubernetes/pkg/apimachinery/registered"
client "k8s.io/kubernetes/pkg/client/unversioned"
"k8s.io/kubernetes/pkg/client/unversioned/clientcmd"
)
func NewClientCache(loader clientcmd.ClientConfig) *ClientCache {
return &ClientCache{
clients: make(map[unversioned.GroupVersion]*client.Client),
configs: make(map[unversioned.GroupVersion]*client.Config),
loader: loader,
}
}
// ClientCache caches previously loaded clients for reuse, and ensures MatchServerVersion
// is invoked only once
type ClientCache struct {
loader clientcmd.ClientConfig
clients map[unversioned.GroupVersion]*client.Client
configs map[unversioned.GroupVersion]*client.Config
defaultConfig *client.Config
defaultClient *client.Client
matchVersion bool
}
// ClientConfigForVersion returns the correct config for a server
func (c *ClientCache) ClientConfigForVersion(version *unversioned.GroupVersion) (*client.Config, error) {
if c.defaultConfig == nil {
config, err := c.loader.ClientConfig()
if err != nil {
return nil, err
}
c.defaultConfig = config
if c.matchVersion {
if err := client.MatchesServerVersion(c.defaultClient, config); err != nil {
return nil, err
}
}
}
if version != nil {
if config, ok := c.configs[*version]; ok {
return config, nil
}
}
// TODO: have a better config copy method
config := *c.defaultConfig
// TODO these fall out when we finish the refactor
var preferredGV *unversioned.GroupVersion
if version != nil {
versionCopy := *version
preferredGV = &versionCopy
}
negotiatedVersion, err := client.NegotiateVersion(c.defaultClient, &config, preferredGV, registered.EnabledVersions())
if err != nil {
return nil, err
}
config.GroupVersion = negotiatedVersion
client.SetKubernetesDefaults(&config)
if version != nil {
c.configs[*version] = &config
}
// `version` does not necessarily equal `config.Version`. However, we know that we call this method again with
// `config.Version`, we should get the the config we've just built.
configCopy := config
c.configs[*config.GroupVersion] = &configCopy
return &config, nil
}
// ClientForVersion initializes or reuses a client for the specified version, or returns an
// error if that is not possible
func (c *ClientCache) ClientForVersion(version *unversioned.GroupVersion) (*client.Client, error) {
if version != nil {
if client, ok := c.clients[*version]; ok {
return client, nil
}
}
config, err := c.ClientConfigForVersion(version)
if err != nil {
return nil, err
}
kubeclient, err := client.New(config)
if err != nil {
return nil, err
}
c.clients[*config.GroupVersion] = kubeclient
// `version` does not necessarily equal `config.Version`. However, we know that if we call this method again with
// `version`, we should get a client based on the same config we just found. There's no guarantee that a client
// is copiable, so create a new client and save it in the cache.
if version != nil {
configCopy := *config
kubeclient, err := client.New(&configCopy)
if err != nil {
return nil, err
}
c.clients[*version] = kubeclient
}
return kubeclient, nil
}