forked from containerd/containerd
/
service.go
92 lines (78 loc) · 2.19 KB
/
service.go
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package events
import (
api "github.com/containerd/containerd/api/services/events/v1"
"github.com/containerd/containerd/errdefs"
"github.com/containerd/containerd/events"
"github.com/containerd/containerd/events/exchange"
"github.com/containerd/containerd/plugin"
ptypes "github.com/gogo/protobuf/types"
"github.com/pkg/errors"
"golang.org/x/net/context"
"google.golang.org/grpc"
)
func init() {
plugin.Register(&plugin.Registration{
Type: plugin.GRPCPlugin,
ID: "events",
InitFn: func(ic *plugin.InitContext) (interface{}, error) {
return NewService(ic.Events), nil
},
})
}
type service struct {
events *exchange.Exchange
}
// NewService returns the GRPC events server
func NewService(events *exchange.Exchange) api.EventsServer {
return &service{events: events}
}
func (s *service) Register(server *grpc.Server) error {
api.RegisterEventsServer(server, s)
return nil
}
func (s *service) Publish(ctx context.Context, r *api.PublishRequest) (*ptypes.Empty, error) {
if err := s.events.Publish(ctx, r.Topic, r.Event); err != nil {
return nil, errdefs.ToGRPC(err)
}
return &ptypes.Empty{}, nil
}
func (s *service) Forward(ctx context.Context, r *api.ForwardRequest) (*ptypes.Empty, error) {
if err := s.events.Forward(ctx, fromProto(r.Envelope)); err != nil {
return nil, errdefs.ToGRPC(err)
}
return &ptypes.Empty{}, nil
}
func (s *service) Subscribe(req *api.SubscribeRequest, srv api.Events_SubscribeServer) error {
ctx, cancel := context.WithCancel(srv.Context())
defer cancel()
eventq, errq := s.events.Subscribe(ctx, req.Filters...)
for {
select {
case ev := <-eventq:
if err := srv.Send(toProto(ev)); err != nil {
return errors.Wrapf(err, "failed sending event to subscriber")
}
case err := <-errq:
if err != nil {
return errors.Wrapf(err, "subscription error")
}
return nil
}
}
}
func toProto(env *events.Envelope) *api.Envelope {
return &api.Envelope{
Timestamp: env.Timestamp,
Namespace: env.Namespace,
Topic: env.Topic,
Event: env.Event,
}
}
func fromProto(env *api.Envelope) *events.Envelope {
return &events.Envelope{
Timestamp: env.Timestamp,
Namespace: env.Namespace,
Topic: env.Topic,
Event: env.Event,
}
}