125 lines
4.0 KiB
Go
125 lines
4.0 KiB
Go
/*
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Copyright 2017 The Kubernetes 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 server
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import (
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"time"
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"github.com/containerd/containerd/api/services/execution"
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"github.com/containerd/containerd/api/types/container"
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"github.com/golang/glog"
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"github.com/jpillora/backoff"
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"golang.org/x/net/context"
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"github.com/kubernetes-incubator/cri-containerd/pkg/metadata"
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)
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const (
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// minRetryInterval is the minimum retry interval when lost connection with containerd.
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minRetryInterval = 100 * time.Millisecond
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// maxRetryInterval is the maximum retry interval when lost connection with containerd.
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maxRetryInterval = 30 * time.Second
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// exponentialFactor is the exponential backoff factor.
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exponentialFactor = 2.0
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)
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// startEventMonitor starts an event monitor which monitors and handles all
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// container events.
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// TODO(random-liu): [P1] Is it possible to drop event during containerd is running?
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func (c *criContainerdService) startEventMonitor() {
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b := backoff.Backoff{
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Min: minRetryInterval,
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Max: maxRetryInterval,
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Factor: exponentialFactor,
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}
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go func() {
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for {
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events, err := c.containerService.Events(context.Background(), &execution.EventsRequest{})
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if err != nil {
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glog.Errorf("Failed to connect to containerd event stream: %v", err)
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time.Sleep(b.Duration())
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continue
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}
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// Successfully connect with containerd, reset backoff.
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b.Reset()
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// TODO(random-liu): Relist to recover state, should prevent other operations
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// until state is fully recovered.
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if err := c.handleEventStream(events); err != nil {
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glog.Errorf("Failed to handle event stream: %v", err)
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time.Sleep(b.Duration())
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continue
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}
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}
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}()
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}
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// handleEventStream receives an event from containerd and handles the event.
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func (c *criContainerdService) handleEventStream(events execution.ContainerService_EventsClient) error {
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e, err := events.Recv()
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if err != nil {
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return err
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}
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glog.V(2).Infof("Received container event: %+v", e)
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c.handleEvent(e)
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return nil
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}
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// handleEvent handles a containerd event.
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func (c *criContainerdService) handleEvent(e *container.Event) {
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switch e.Type {
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// If containerd-shim exits unexpectedly, there will be no corresponding event.
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// However, containerd could not retrieve container state in that case, so it's
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// fine to leave out that case for now.
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// TODO(random-liu): [P2] Handle containerd-shim exit.
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case container.Event_EXIT:
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meta, err := c.containerStore.Get(e.ID)
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if err != nil {
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glog.Errorf("Failed to get container %q metadata: %v", e.ID, err)
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return
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}
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if e.Pid != meta.Pid {
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// Non-init process died, ignore the event.
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return
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}
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// Delete the container from containerd.
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_, err = c.containerService.Delete(context.Background(), &execution.DeleteRequest{ID: e.ID})
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if err != nil && !isContainerdContainerNotExistError(err) {
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// TODO(random-liu): [P0] Enqueue the event and retry.
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glog.Errorf("Failed to delete container %q: %v", e.ID, err)
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return
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}
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err = c.containerStore.Update(e.ID, func(meta metadata.ContainerMetadata) (metadata.ContainerMetadata, error) {
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// If FinishedAt has been set (e.g. with start failure), keep as
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// it is.
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if meta.FinishedAt != 0 {
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return meta, nil
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}
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meta.Pid = 0
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meta.FinishedAt = e.ExitedAt.UnixNano()
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meta.ExitCode = int32(e.ExitStatus)
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return meta, nil
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})
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if err != nil {
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glog.Errorf("Failed to update container %q state: %v", e.ID, err)
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// TODO(random-liu): [P0] Enqueue the event and retry.
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return
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}
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case container.Event_OOM:
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// TODO(random-liu): [P1] Handle OOM event.
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}
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}
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