mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-11-26 16:20:28 +00:00
123 lines
4.2 KiB
Go
123 lines
4.2 KiB
Go
|
/*
|
||
|
Copyright 2016 The Kubernetes Authors.
|
||
|
|
||
|
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/apimachinery/pkg/api/meta"
|
||
|
"k8s.io/apimachinery/pkg/runtime/schema"
|
||
|
restclient "k8s.io/client-go/rest"
|
||
|
)
|
||
|
|
||
|
// ClientPool manages a pool of dynamic clients.
|
||
|
type ClientPool interface {
|
||
|
// ClientForGroupVersionResource returns a client configured for the specified groupVersionResource.
|
||
|
// Resource may be empty.
|
||
|
ClientForGroupVersionResource(resource schema.GroupVersionResource) (Interface, error)
|
||
|
// ClientForGroupVersionKind returns a client configured for the specified groupVersionKind.
|
||
|
// Kind may be empty.
|
||
|
ClientForGroupVersionKind(kind schema.GroupVersionKind) (Interface, error)
|
||
|
}
|
||
|
|
||
|
// APIPathResolverFunc knows how to convert a groupVersion to its API path. The Kind field is
|
||
|
// optional.
|
||
|
type APIPathResolverFunc func(kind schema.GroupVersionKind) string
|
||
|
|
||
|
// LegacyAPIPathResolverFunc can resolve paths properly with the legacy API.
|
||
|
func LegacyAPIPathResolverFunc(kind schema.GroupVersionKind) string {
|
||
|
if len(kind.Group) == 0 {
|
||
|
return "/api"
|
||
|
}
|
||
|
return "/apis"
|
||
|
}
|
||
|
|
||
|
// clientPoolImpl implements ClientPool and caches clients for the resource group versions
|
||
|
// is asked to retrieve. This type is thread safe.
|
||
|
type clientPoolImpl struct {
|
||
|
lock sync.RWMutex
|
||
|
config *restclient.Config
|
||
|
clients map[schema.GroupVersion]*Client
|
||
|
apiPathResolverFunc APIPathResolverFunc
|
||
|
mapper meta.RESTMapper
|
||
|
}
|
||
|
|
||
|
// NewClientPool returns a ClientPool from the specified config. It reuses clients for the same
|
||
|
// group version. It is expected this type may be wrapped by specific logic that special cases certain
|
||
|
// resources or groups.
|
||
|
func NewClientPool(config *restclient.Config, mapper meta.RESTMapper, apiPathResolverFunc APIPathResolverFunc) ClientPool {
|
||
|
confCopy := *config
|
||
|
|
||
|
return &clientPoolImpl{
|
||
|
config: &confCopy,
|
||
|
clients: map[schema.GroupVersion]*Client{},
|
||
|
apiPathResolverFunc: apiPathResolverFunc,
|
||
|
mapper: mapper,
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// Instantiates a new dynamic client pool with the given config.
|
||
|
func NewDynamicClientPool(cfg *restclient.Config) ClientPool {
|
||
|
// restMapper is not needed when using LegacyAPIPathResolverFunc
|
||
|
emptyMapper := meta.MultiRESTMapper{}
|
||
|
return NewClientPool(cfg, emptyMapper, LegacyAPIPathResolverFunc)
|
||
|
}
|
||
|
|
||
|
// ClientForGroupVersionResource uses the provided RESTMapper to identify the appropriate resource. Resource may
|
||
|
// be empty. If no matching kind is found the underlying client for that group is still returned.
|
||
|
func (c *clientPoolImpl) ClientForGroupVersionResource(resource schema.GroupVersionResource) (Interface, error) {
|
||
|
kinds, err := c.mapper.KindsFor(resource)
|
||
|
if err != nil {
|
||
|
if meta.IsNoMatchError(err) {
|
||
|
return c.ClientForGroupVersionKind(schema.GroupVersionKind{Group: resource.Group, Version: resource.Version})
|
||
|
}
|
||
|
return nil, err
|
||
|
}
|
||
|
return c.ClientForGroupVersionKind(kinds[0])
|
||
|
}
|
||
|
|
||
|
// ClientForGroupVersion returns a client for the specified groupVersion, creates one if none exists. Kind
|
||
|
// in the GroupVersionKind may be empty.
|
||
|
func (c *clientPoolImpl) ClientForGroupVersionKind(kind schema.GroupVersionKind) (Interface, error) {
|
||
|
c.lock.Lock()
|
||
|
defer c.lock.Unlock()
|
||
|
|
||
|
gv := kind.GroupVersion()
|
||
|
|
||
|
// do we have a client already configured?
|
||
|
if existingClient, found := c.clients[gv]; 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(kind)
|
||
|
|
||
|
// we need to make a client
|
||
|
conf.GroupVersion = &gv
|
||
|
|
||
|
dynamicClient, err := NewClient(conf)
|
||
|
if err != nil {
|
||
|
return nil, err
|
||
|
}
|
||
|
c.clients[gv] = dynamicClient
|
||
|
return dynamicClient, nil
|
||
|
}
|