75 lines
2.4 KiB
Go
75 lines
2.4 KiB
Go
/*
|
|
Copyright 2018 the Heptio Ark contributors.
|
|
|
|
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 plugin
|
|
|
|
import (
|
|
"github.com/sirupsen/logrus"
|
|
"google.golang.org/grpc"
|
|
)
|
|
|
|
// clientBase implements client and contains shared fields common to all clients.
|
|
type clientBase struct {
|
|
plugin string
|
|
logger logrus.FieldLogger
|
|
}
|
|
|
|
type ClientDispenser interface {
|
|
clientFor(name string) interface{}
|
|
}
|
|
|
|
// clientDispenser supports the initialization and retrieval of multiple implementations for a single plugin kind, such as
|
|
// "aws" and "azure" implementations of the object store plugin.
|
|
type clientDispenser struct {
|
|
// logger is the log the plugin should use.
|
|
logger logrus.FieldLogger
|
|
// clienConn is shared among all implementations for this client.
|
|
clientConn *grpc.ClientConn
|
|
// initFunc returns a client that implements a plugin interface, such as cloudprovider.ObjectStore.
|
|
initFunc clientInitFunc
|
|
// clients keeps track of all the initialized implementations.
|
|
clients map[string]interface{}
|
|
}
|
|
|
|
type clientInitFunc func(base *clientBase, clientConn *grpc.ClientConn) interface{}
|
|
|
|
// newClientDispenser creates a new clientDispenser.
|
|
func newClientDispenser(logger logrus.FieldLogger, clientConn *grpc.ClientConn, initFunc clientInitFunc) *clientDispenser {
|
|
return &clientDispenser{
|
|
clientConn: clientConn,
|
|
logger: logger,
|
|
initFunc: initFunc,
|
|
clients: make(map[string]interface{}),
|
|
}
|
|
}
|
|
|
|
// clientFor returns a gRPC client stub for the implementation of a plugin named name. If the client stub does not
|
|
// currently exist, clientFor creates it.
|
|
func (cd *clientDispenser) clientFor(name string) interface{} {
|
|
if client, found := cd.clients[name]; found {
|
|
return client
|
|
}
|
|
|
|
base := &clientBase{
|
|
plugin: name,
|
|
logger: cd.logger,
|
|
}
|
|
// Initialize the plugin (e.g. newBackupItemActionGRPCClient())
|
|
client := cd.initFunc(base, cd.clientConn)
|
|
cd.clients[name] = client
|
|
|
|
return client
|
|
}
|