mirror of https://github.com/k3s-io/k3s
77 lines
2.0 KiB
Go
77 lines
2.0 KiB
Go
/*
|
|
Copyright 2014 Google Inc. 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 (
|
|
"github.com/GoogleCloudPlatform/kubernetes/pkg/client"
|
|
"github.com/GoogleCloudPlatform/kubernetes/pkg/client/clientcmd"
|
|
)
|
|
|
|
// clientCache caches previously loaded clients for reuse, and ensures MatchServerVersion
|
|
// is invoked only once
|
|
type clientCache struct {
|
|
loader clientcmd.ClientConfig
|
|
clients map[string]*client.Client
|
|
defaultConfig *client.Config
|
|
matchVersion bool
|
|
}
|
|
|
|
// ClientConfigForVersion returns the correct config for a server
|
|
func (c *clientCache) ClientConfigForVersion(version string) (*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(config); err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
}
|
|
// TODO: have a better config copy method
|
|
config := *c.defaultConfig
|
|
if len(version) != 0 {
|
|
config.Version = version
|
|
}
|
|
client.SetKubernetesDefaults(&config)
|
|
|
|
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 string) (*client.Client, error) {
|
|
config, err := c.ClientConfigForVersion(version)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if client, ok := c.clients[config.Version]; ok {
|
|
return client, nil
|
|
}
|
|
|
|
client, err := client.New(config)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
c.clients[config.Version] = client
|
|
return client, nil
|
|
}
|