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client_pool.go
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client_pool.go
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/*
Copyright 2016 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 dynamic
import (
"sync"
"k8s.io/kubernetes/pkg/api/unversioned"
"k8s.io/kubernetes/pkg/client/restclient"
)
// ClientPool manages a pool of dynamic clients.
type ClientPool interface {
// ClientForGroupVersion returns a client configured for the specified groupVersion.
ClientForGroupVersion(groupVersion unversioned.GroupVersion) (*Client, error)
}
// APIPathResolverFunc knows how to convert a groupVersion to its API path.
type APIPathResolverFunc func(groupVersion unversioned.GroupVersion) string
// LegacyAPIPathResolverFunc can resolve paths properly with the legacy API.
func LegacyAPIPathResolverFunc(groupVersion unversioned.GroupVersion) string {
if len(groupVersion.Group) == 0 {
return "/api"
}
return "/apis"
}
// clientPoolImpl implements Factory
type clientPoolImpl struct {
lock sync.RWMutex
config *restclient.Config
clients map[unversioned.GroupVersion]*Client
apiPathResolverFunc APIPathResolverFunc
}
// NewClientPool returns a ClientPool from the specified config
func NewClientPool(config *restclient.Config, apiPathResolverFunc APIPathResolverFunc) ClientPool {
return &clientPoolImpl{
config: config,
clients: map[unversioned.GroupVersion]*Client{},
apiPathResolverFunc: apiPathResolverFunc,
}
}
// ClientForGroupVersion returns a client for the specified groupVersion, creates one if none exists
func (c *clientPoolImpl) ClientForGroupVersion(groupVersion unversioned.GroupVersion) (*Client, error) {
c.lock.Lock()
defer c.lock.Unlock()
// do we have a client already configured?
if existingClient, found := c.clients[groupVersion]; found {
return existingClient, nil
}
// avoid changing the original config
confCopy := *c.config
conf := &confCopy
// we need to set the api path based on group version, if no group, default to legacy path
conf.APIPath = c.apiPathResolverFunc(groupVersion)
// we need to make a client
conf.GroupVersion = &groupVersion
dynamicClient, err := NewClient(conf)
if err != nil {
return nil, err
}
c.clients[groupVersion] = dynamicClient
return dynamicClient, nil
}