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https://github.com/vmware-tanzu/velero.git
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dc6eeafe98
Pass Velero server command args to the plugins Fixes #7806 Signed-off-by: Wenkai Yin(尹文开) <yinw@vmware.com>
127 lines
3.3 KiB
Go
127 lines
3.3 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 process
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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/vmware-tanzu/velero/pkg/plugin/framework/common"
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)
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type Factory 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() Factory {
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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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// removeFeaturesFlag looks for and removes the '--features' arg
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// as well as the arg immediately following it (the flag value).
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func removeFeaturesFlag(args []string) []string {
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var commandArgs []string
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var featureFlag bool
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for _, arg := range args {
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// if this arg is the flag name, skip it
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if arg == "--features" {
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featureFlag = true
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continue
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}
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// if the last arg we saw was the flag name, then
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// this arg is the value for the flag, so skip it
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if featureFlag {
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featureFlag = false
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continue
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}
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// otherwise, keep the arg
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commandArgs = append(commandArgs, arg)
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}
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return commandArgs
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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.(common.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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