146 lines
3.1 KiB
Go
146 lines
3.1 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 shim
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import (
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"context"
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"net"
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"sync"
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"time"
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v1 "github.com/containerd/containerd/api/services/ttrpc/events/v1"
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"github.com/containerd/containerd/events"
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"github.com/containerd/containerd/namespaces"
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"github.com/containerd/typeurl"
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"github.com/sirupsen/logrus"
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)
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const (
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queueSize = 2048
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maxRequeue = 5
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)
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type item struct {
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ev *v1.Envelope
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ctx context.Context
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count int
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}
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func newPublisher(address string) *remoteEventsPublisher {
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l := &remoteEventsPublisher{
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dialer: newDialier(func() (net.Conn, error) {
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return connect(address, dial)
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}),
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closed: make(chan struct{}),
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requeue: make(chan *item, queueSize),
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}
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go l.processQueue()
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return l
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}
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type remoteEventsPublisher struct {
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dialer *dialer
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closed chan struct{}
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closer sync.Once
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requeue chan *item
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}
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func (l *remoteEventsPublisher) Done() <-chan struct{} {
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return l.closed
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}
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func (l *remoteEventsPublisher) Close() (err error) {
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err = l.dialer.Close()
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l.closer.Do(func() {
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close(l.closed)
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})
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return err
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}
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func (l *remoteEventsPublisher) processQueue() {
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for i := range l.requeue {
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if i.count > maxRequeue {
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logrus.Errorf("evicting %s from queue because of retry count", i.ev.Topic)
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// drop the event
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continue
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}
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client, err := l.dialer.Get()
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if err != nil {
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l.dialer.Put(err)
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l.queue(i)
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logrus.WithError(err).Error("get events client")
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continue
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}
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if _, err := client.Forward(i.ctx, &v1.ForwardRequest{
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Envelope: i.ev,
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}); err != nil {
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l.dialer.Put(err)
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logrus.WithError(err).Error("forward event")
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l.queue(i)
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}
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}
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}
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func (l *remoteEventsPublisher) queue(i *item) {
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go func() {
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i.count++
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// re-queue after a short delay
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time.Sleep(time.Duration(1*i.count) * time.Second)
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l.requeue <- i
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}()
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}
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func (l *remoteEventsPublisher) Publish(ctx context.Context, topic string, event events.Event) error {
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ns, err := namespaces.NamespaceRequired(ctx)
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if err != nil {
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return err
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}
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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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i := &item{
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ev: &v1.Envelope{
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Timestamp: time.Now(),
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Namespace: ns,
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Topic: topic,
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Event: any,
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},
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ctx: ctx,
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}
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client, err := l.dialer.Get()
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if err != nil {
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l.dialer.Put(err)
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l.queue(i)
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return err
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}
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if _, err := client.Forward(i.ctx, &v1.ForwardRequest{
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Envelope: i.ev,
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}); err != nil {
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l.dialer.Put(err)
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l.queue(i)
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return err
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}
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return nil
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}
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func connect(address string, d func(string, time.Duration) (net.Conn, error)) (net.Conn, error) {
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return d(address, 5*time.Second)
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}
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