/
backup_item_action.go
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/
backup_item_action.go
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/*
Copyright 2017 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 (
"encoding/json"
"github.com/hashicorp/go-plugin"
"github.com/sirupsen/logrus"
"golang.org/x/net/context"
"google.golang.org/grpc"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
api "github.com/heptio/ark/pkg/apis/ark/v1"
arkbackup "github.com/heptio/ark/pkg/backup"
proto "github.com/heptio/ark/pkg/plugin/generated"
)
// BackupItemActionPlugin is an implementation of go-plugin's Plugin
// interface with support for gRPC for the backup/ItemAction
// interface.
type BackupItemActionPlugin struct {
plugin.NetRPCUnsupportedPlugin
impl arkbackup.ItemAction
log *logrusAdapter
}
// NewBackupItemActionPlugin constructs a BackupItemActionPlugin.
func NewBackupItemActionPlugin(itemAction arkbackup.ItemAction) *BackupItemActionPlugin {
return &BackupItemActionPlugin{
impl: itemAction,
}
}
func (p *BackupItemActionPlugin) Kind() PluginKind {
return PluginKindBackupItemAction
}
// GRPCServer registers a BackupItemAction gRPC server.
func (p *BackupItemActionPlugin) GRPCServer(s *grpc.Server) error {
proto.RegisterBackupItemActionServer(s, &BackupItemActionGRPCServer{impl: p.impl})
return nil
}
// GRPCClient returns a BackupItemAction gRPC client.
func (p *BackupItemActionPlugin) GRPCClient(c *grpc.ClientConn) (interface{}, error) {
return &BackupItemActionGRPCClient{grpcClient: proto.NewBackupItemActionClient(c), log: p.log}, nil
}
// BackupItemActionGRPCClient implements the backup/ItemAction interface and uses a
// gRPC client to make calls to the plugin server.
type BackupItemActionGRPCClient struct {
grpcClient proto.BackupItemActionClient
log *logrusAdapter
}
func (c *BackupItemActionGRPCClient) AppliesTo() (arkbackup.ResourceSelector, error) {
res, err := c.grpcClient.AppliesTo(context.Background(), &proto.Empty{})
if err != nil {
return arkbackup.ResourceSelector{}, err
}
return arkbackup.ResourceSelector{
IncludedNamespaces: res.IncludedNamespaces,
ExcludedNamespaces: res.ExcludedNamespaces,
IncludedResources: res.IncludedResources,
ExcludedResources: res.ExcludedResources,
LabelSelector: res.Selector,
}, nil
}
func (c *BackupItemActionGRPCClient) Execute(item runtime.Unstructured, backup *api.Backup) (runtime.Unstructured, []arkbackup.ResourceIdentifier, error) {
itemJSON, err := json.Marshal(item.UnstructuredContent())
if err != nil {
return nil, nil, err
}
backupJSON, err := json.Marshal(backup)
if err != nil {
return nil, nil, err
}
req := &proto.ExecuteRequest{
Item: itemJSON,
Backup: backupJSON,
}
res, err := c.grpcClient.Execute(context.Background(), req)
if err != nil {
return nil, nil, err
}
var updatedItem unstructured.Unstructured
if err := json.Unmarshal(res.Item, &updatedItem); err != nil {
return nil, nil, err
}
var additionalItems []arkbackup.ResourceIdentifier
for _, itm := range res.AdditionalItems {
newItem := arkbackup.ResourceIdentifier{
GroupResource: schema.GroupResource{
Group: itm.Group,
Resource: itm.Resource,
},
Namespace: itm.Namespace,
Name: itm.Name,
}
additionalItems = append(additionalItems, newItem)
}
return &updatedItem, additionalItems, nil
}
func (c *BackupItemActionGRPCClient) SetLog(log logrus.FieldLogger) {
c.log.impl = log
}
// BackupItemActionGRPCServer implements the proto-generated BackupItemActionServer interface, and accepts
// gRPC calls and forwards them to an implementation of the pluggable interface.
type BackupItemActionGRPCServer struct {
impl arkbackup.ItemAction
}
func (s *BackupItemActionGRPCServer) AppliesTo(ctx context.Context, req *proto.Empty) (*proto.AppliesToResponse, error) {
resourceSelector, err := s.impl.AppliesTo()
if err != nil {
return nil, err
}
return &proto.AppliesToResponse{
IncludedNamespaces: resourceSelector.IncludedNamespaces,
ExcludedNamespaces: resourceSelector.ExcludedNamespaces,
IncludedResources: resourceSelector.IncludedResources,
ExcludedResources: resourceSelector.ExcludedResources,
Selector: resourceSelector.LabelSelector,
}, nil
}
func (s *BackupItemActionGRPCServer) Execute(ctx context.Context, req *proto.ExecuteRequest) (*proto.ExecuteResponse, error) {
var item unstructured.Unstructured
var backup api.Backup
if err := json.Unmarshal(req.Item, &item); err != nil {
return nil, err
}
if err := json.Unmarshal(req.Backup, &backup); err != nil {
return nil, err
}
updatedItem, additionalItems, err := s.impl.Execute(&item, &backup)
if err != nil {
return nil, err
}
updatedItemJSON, err := json.Marshal(updatedItem.UnstructuredContent())
if err != nil {
return nil, err
}
res := &proto.ExecuteResponse{
Item: updatedItemJSON,
}
for _, itm := range additionalItems {
val := proto.ResourceIdentifier{
Group: itm.Group,
Resource: itm.Resource,
Namespace: itm.Namespace,
Name: itm.Name,
}
res.AdditionalItems = append(res.AdditionalItems, &val)
}
return res, nil
}