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