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libcontainerd: use cancellable context for events

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The event subscriber can only be cancelled by cancelling the context.
In the case where we have to restart event processing we are never
cancelling the old subscribiption.

Signed-off-by: Brian Goff <cpuguy83@gmail.com>
This commit is contained in:
Brian Goff 2020-07-17 11:39:32 -07:00
parent 60d7265803
commit 906007f6c1
1 changed files with 14 additions and 4 deletions
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18
libcontainerd/remote/client.go
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@ -722,9 +722,12 @@ func (c *client) waitServe(ctx context.Context) bool {
// `IsServing` will actually block until the service is ready.
// However it can return early, so we'll loop with a delay to handle it.
for {
serving, _ := c.client.IsServing(ctx)
if ctx.Err() != nil {
return false
serving, err := c.client.IsServing(ctx)
if err != nil {
if errors.Is(err, context.DeadlineExceeded) || errors.Is(err, context.Canceled) {
return false
}
logrus.WithError(err).Warn("Error while testing if containerd API is ready")
}
if serving {
@ -748,9 +751,16 @@ func (c *client) processEventStream(ctx context.Context, ns string) {
ei libcontainerdtypes.EventInfo
)
// Create a new context specifically for this subscription.
// The context must be cancelled to cancel the subscription.
// In cases where we have to restart event stream processing,
// we'll need the original context b/c this one will be cancelled
subCtx, cancel := context.WithCancel(ctx)
defer cancel()
// Filter on both namespace *and* topic. To create an "and" filter,
// this must be a single, comma-separated string
eventStream, errC := c.client.EventService().Subscribe(ctx, "namespace=="+ns+",topic~=|^/tasks/|")
eventStream, errC := c.client.EventService().Subscribe(subCtx, "namespace=="+ns+",topic~=|^/tasks/|")
c.logger.Debug("processing event stream")