100 lines
2.7 KiB
Go
100 lines
2.7 KiB
Go
/*
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Copyright 2018 the Velero contributors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package clientmgmt
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import (
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plugin "github.com/hashicorp/go-plugin"
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"github.com/pkg/errors"
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"github.com/sirupsen/logrus"
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"github.com/heptio/velero/pkg/plugin/framework"
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)
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type ProcessFactory interface {
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newProcess(command string, logger logrus.FieldLogger, logLevel logrus.Level) (Process, error)
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}
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type processFactory struct {
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}
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func newProcessFactory() ProcessFactory {
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return &processFactory{}
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}
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func (pf *processFactory) newProcess(command string, logger logrus.FieldLogger, logLevel logrus.Level) (Process, error) {
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return newProcess(command, logger, logLevel)
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}
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type Process interface {
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dispense(key kindAndName) (interface{}, error)
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exited() bool
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kill()
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}
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type process struct {
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client *plugin.Client
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protocolClient plugin.ClientProtocol
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}
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func newProcess(command string, logger logrus.FieldLogger, logLevel logrus.Level) (Process, error) {
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builder := newClientBuilder(command, logger.WithField("cmd", command), logLevel)
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// This creates a new go-plugin Client that has its own unique exec.Cmd for launching the plugin process.
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client := builder.client()
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// This launches the plugin process.
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protocolClient, err := client.Client()
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if err != nil {
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return nil, err
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}
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p := &process{
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client: client,
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protocolClient: protocolClient,
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}
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return p, nil
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}
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func (r *process) dispense(key kindAndName) (interface{}, error) {
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// This calls GRPCClient(clientConn) on the plugin instance registered for key.name.
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dispensed, err := r.protocolClient.Dispense(key.kind.String())
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if err != nil {
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return nil, errors.WithStack(err)
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}
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// Currently all plugins except for PluginLister dispense clientDispenser instances.
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if clientDispenser, ok := dispensed.(framework.ClientDispenser); ok {
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if key.name == "" {
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return nil, errors.Errorf("%s plugin requested but name is missing", key.kind.String())
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}
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// Get the instance that implements our plugin interface (e.g. ObjectStore) that is a gRPC-based
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// client
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dispensed = clientDispenser.ClientFor(key.name)
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}
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return dispensed, nil
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}
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func (r *process) exited() bool {
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return r.client.Exited()
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}
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func (r *process) kill() {
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r.client.Kill()
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}
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