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service.go
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service.go
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package containers
import (
"github.com/boltdb/bolt"
api "github.com/containerd/containerd/api/services/containers/v1"
eventsapi "github.com/containerd/containerd/api/services/events/v1"
"github.com/containerd/containerd/containers"
"github.com/containerd/containerd/errdefs"
"github.com/containerd/containerd/events"
"github.com/containerd/containerd/metadata"
"github.com/containerd/containerd/plugin"
"github.com/golang/protobuf/ptypes/empty"
"golang.org/x/net/context"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
func init() {
plugin.Register(&plugin.Registration{
Type: plugin.GRPCPlugin,
ID: "containers",
Requires: []plugin.PluginType{
plugin.MetadataPlugin,
},
Init: func(ic *plugin.InitContext) (interface{}, error) {
e := events.GetPoster(ic.Context)
m, err := ic.Get(plugin.MetadataPlugin)
if err != nil {
return nil, err
}
return NewService(m.(*bolt.DB), e), nil
},
})
}
type Service struct {
db *bolt.DB
emitter events.Poster
}
func NewService(db *bolt.DB, evts events.Poster) api.ContainersServer {
return &Service{db: db, emitter: evts}
}
func (s *Service) Register(server *grpc.Server) error {
api.RegisterContainersServer(server, s)
return nil
}
func (s *Service) Get(ctx context.Context, req *api.GetContainerRequest) (*api.GetContainerResponse, error) {
var resp api.GetContainerResponse
return &resp, errdefs.ToGRPC(s.withStoreView(ctx, func(ctx context.Context, store containers.Store) error {
container, err := store.Get(ctx, req.ID)
if err != nil {
return err
}
containerpb := containerToProto(&container)
resp.Container = containerpb
return nil
}))
}
func (s *Service) List(ctx context.Context, req *api.ListContainersRequest) (*api.ListContainersResponse, error) {
var resp api.ListContainersResponse
return &resp, errdefs.ToGRPC(s.withStoreView(ctx, func(ctx context.Context, store containers.Store) error {
containers, err := store.List(ctx, req.Filters...)
if err != nil {
return err
}
resp.Containers = containersToProto(containers)
return nil
}))
}
func (s *Service) Create(ctx context.Context, req *api.CreateContainerRequest) (*api.CreateContainerResponse, error) {
var resp api.CreateContainerResponse
if err := s.withStoreUpdate(ctx, func(ctx context.Context, store containers.Store) error {
container := containerFromProto(&req.Container)
created, err := store.Create(ctx, container)
if err != nil {
return err
}
resp.Container = containerToProto(&created)
return nil
}); err != nil {
return &resp, errdefs.ToGRPC(err)
}
if err := s.emit(ctx, "/containers/create", &eventsapi.ContainerCreate{
ID: resp.Container.ID,
Image: resp.Container.Image,
Runtime: &eventsapi.ContainerCreate_Runtime{
Name: resp.Container.Runtime.Name,
Options: resp.Container.Runtime.Options,
},
}); err != nil {
return &resp, err
}
return &resp, nil
}
func (s *Service) Update(ctx context.Context, req *api.UpdateContainerRequest) (*api.UpdateContainerResponse, error) {
if req.Container.ID == "" {
return nil, status.Errorf(codes.InvalidArgument, "Container.ID required")
}
var (
resp api.UpdateContainerResponse
container = containerFromProto(&req.Container)
)
if err := s.withStoreUpdate(ctx, func(ctx context.Context, store containers.Store) error {
var fieldpaths []string
if req.UpdateMask != nil && len(req.UpdateMask.Paths) > 0 {
for _, path := range req.UpdateMask.Paths {
fieldpaths = append(fieldpaths, path)
}
}
updated, err := store.Update(ctx, container)
if err != nil {
return err
}
resp.Container = containerToProto(&updated)
return nil
}); err != nil {
return &resp, errdefs.ToGRPC(err)
}
if err := s.emit(ctx, "/containers/update", &eventsapi.ContainerUpdate{
ID: resp.Container.ID,
Image: resp.Container.Image,
Labels: resp.Container.Labels,
RootFS: resp.Container.RootFS,
}); err != nil {
return &resp, err
}
return &resp, nil
}
func (s *Service) Delete(ctx context.Context, req *api.DeleteContainerRequest) (*empty.Empty, error) {
if err := s.withStoreUpdate(ctx, func(ctx context.Context, store containers.Store) error {
return store.Delete(ctx, req.ID)
}); err != nil {
return &empty.Empty{}, errdefs.ToGRPC(err)
}
if err := s.emit(ctx, "/containers/delete", &eventsapi.ContainerDelete{
ID: req.ID,
}); err != nil {
return &empty.Empty{}, err
}
return &empty.Empty{}, nil
}
func (s *Service) withStore(ctx context.Context, fn func(ctx context.Context, store containers.Store) error) func(tx *bolt.Tx) error {
return func(tx *bolt.Tx) error { return fn(ctx, metadata.NewContainerStore(tx)) }
}
func (s *Service) withStoreView(ctx context.Context, fn func(ctx context.Context, store containers.Store) error) error {
return s.db.View(s.withStore(ctx, fn))
}
func (s *Service) withStoreUpdate(ctx context.Context, fn func(ctx context.Context, store containers.Store) error) error {
return s.db.Update(s.withStore(ctx, fn))
}
func (s *Service) emit(ctx context.Context, topic string, evt interface{}) error {
emitterCtx := events.WithTopic(ctx, topic)
if err := s.emitter.Post(emitterCtx, evt); err != nil {
return err
}
return nil
}