123 lines
2.7 KiB
Go
123 lines
2.7 KiB
Go
/*
|
|
Copyright The containerd Authors.
|
|
|
|
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 containerd
|
|
|
|
import (
|
|
"context"
|
|
|
|
eventsapi "github.com/containerd/containerd/api/services/events/v1"
|
|
"github.com/containerd/containerd/errdefs"
|
|
"github.com/containerd/containerd/events"
|
|
"github.com/containerd/typeurl"
|
|
)
|
|
|
|
// EventService handles the publish, forward and subscribe of events.
|
|
type EventService interface {
|
|
events.Publisher
|
|
events.Forwarder
|
|
events.Subscriber
|
|
}
|
|
|
|
// NewEventServiceFromClient returns a new event service which communicates
|
|
// over a GRPC connection.
|
|
func NewEventServiceFromClient(client eventsapi.EventsClient) EventService {
|
|
return &eventRemote{
|
|
client: client,
|
|
}
|
|
}
|
|
|
|
type eventRemote struct {
|
|
client eventsapi.EventsClient
|
|
}
|
|
|
|
func (e *eventRemote) Publish(ctx context.Context, topic string, event events.Event) error {
|
|
any, err := typeurl.MarshalAny(event)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
req := &eventsapi.PublishRequest{
|
|
Topic: topic,
|
|
Event: any,
|
|
}
|
|
if _, err := e.client.Publish(ctx, req); err != nil {
|
|
return errdefs.FromGRPC(err)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (e *eventRemote) Forward(ctx context.Context, envelope *events.Envelope) error {
|
|
req := &eventsapi.ForwardRequest{
|
|
Envelope: &eventsapi.Envelope{
|
|
Timestamp: envelope.Timestamp,
|
|
Namespace: envelope.Namespace,
|
|
Topic: envelope.Topic,
|
|
Event: envelope.Event,
|
|
},
|
|
}
|
|
if _, err := e.client.Forward(ctx, req); err != nil {
|
|
return errdefs.FromGRPC(err)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (e *eventRemote) Subscribe(ctx context.Context, filters ...string) (ch <-chan *events.Envelope, errs <-chan error) {
|
|
var (
|
|
evq = make(chan *events.Envelope)
|
|
errq = make(chan error, 1)
|
|
)
|
|
|
|
errs = errq
|
|
ch = evq
|
|
|
|
session, err := e.client.Subscribe(ctx, &eventsapi.SubscribeRequest{
|
|
Filters: filters,
|
|
})
|
|
if err != nil {
|
|
errq <- err
|
|
close(errq)
|
|
return
|
|
}
|
|
|
|
go func() {
|
|
defer close(errq)
|
|
|
|
for {
|
|
ev, err := session.Recv()
|
|
if err != nil {
|
|
errq <- err
|
|
return
|
|
}
|
|
|
|
select {
|
|
case evq <- &events.Envelope{
|
|
Timestamp: ev.Timestamp,
|
|
Namespace: ev.Namespace,
|
|
Topic: ev.Topic,
|
|
Event: ev.Event,
|
|
}:
|
|
case <-ctx.Done():
|
|
if cerr := ctx.Err(); cerr != context.Canceled {
|
|
errq <- cerr
|
|
}
|
|
return
|
|
}
|
|
}
|
|
}()
|
|
|
|
return ch, errs
|
|
}
|