88 lines
3.1 KiB
Go
88 lines
3.1 KiB
Go
/*
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Copyright 2018 the Heptio Ark 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 plugin
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import (
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"github.com/pkg/errors"
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"k8s.io/apimachinery/pkg/runtime"
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api "github.com/heptio/velero/pkg/apis/velero/v1"
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"github.com/heptio/velero/pkg/backup"
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)
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// restartableBackupItemAction is a backup item action for a given implementation (such as "pod"). It is associated with
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// a restartableProcess, which may be shared and used to run multiple plugins. At the beginning of each method
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// call, the restartableBackupItemAction asks its restartableProcess to restart itself if needed (e.g. if the
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// process terminated for any reason), then it proceeds with the actual call.
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type restartableBackupItemAction struct {
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key kindAndName
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sharedPluginProcess RestartableProcess
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}
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// newRestartableBackupItemAction returns a new restartableBackupItemAction.
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func newRestartableBackupItemAction(name string, sharedPluginProcess RestartableProcess) *restartableBackupItemAction {
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r := &restartableBackupItemAction{
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key: kindAndName{kind: PluginKindBackupItemAction, name: name},
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sharedPluginProcess: sharedPluginProcess,
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}
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return r
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}
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// getBackupItemAction returns the backup item action for this restartableBackupItemAction. It does *not* restart the
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// plugin process.
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func (r *restartableBackupItemAction) getBackupItemAction() (backup.ItemAction, error) {
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plugin, err := r.sharedPluginProcess.getByKindAndName(r.key)
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if err != nil {
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return nil, err
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}
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backupItemAction, ok := plugin.(backup.ItemAction)
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if !ok {
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return nil, errors.Errorf("%T is not a backup.ItemAction!", plugin)
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}
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return backupItemAction, nil
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}
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// getDelegate restarts the plugin process (if needed) and returns the backup item action for this restartableBackupItemAction.
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func (r *restartableBackupItemAction) getDelegate() (backup.ItemAction, error) {
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if err := r.sharedPluginProcess.resetIfNeeded(); err != nil {
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return nil, err
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}
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return r.getBackupItemAction()
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}
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// AppliesTo restarts the plugin's process if needed, then delegates the call.
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func (r *restartableBackupItemAction) AppliesTo() (backup.ResourceSelector, error) {
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delegate, err := r.getDelegate()
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if err != nil {
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return backup.ResourceSelector{}, err
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}
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return delegate.AppliesTo()
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}
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// Execute restarts the plugin's process if needed, then delegates the call.
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func (r *restartableBackupItemAction) Execute(item runtime.Unstructured, backup *api.Backup) (runtime.Unstructured, []backup.ResourceIdentifier, error) {
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delegate, err := r.getDelegate()
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if err != nil {
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return nil, nil, err
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}
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return delegate.Execute(item, backup)
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}
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