Merge pull request #575 from miaoyq/use-channel-propagate-stop-info-of-sandbox

Use channel to propagate the stop info of sandbox

pkg/server/container_stop.go

@@ -129,7 +129,7 @@ func (c *criContainerdService) stopContainer(ctx context.Context, container cont
 	return nil
 }
 
-// waitContainerStop waits for container to be stopped until timeout exceeds or centext is cancelled.
+// waitContainerStop waits for container to be stopped until timeout exceeds or context is cancelled.
 func (c *criContainerdService) waitContainerStop(ctx context.Context, container containerstore.Container, timeout time.Duration) error {
 	timeoutTimer := time.NewTimer(timeout)
 	defer timeoutTimer.Stop()

pkg/server/container_stop_test.go

@@ -68,10 +68,6 @@ func TestWaitContainerStop(t *testing.T) {
 		)
 		assert.NoError(t, err)
 		assert.NoError(t, c.containerStore.Add(container))
-		if test.status.FinishedAt != 0 {
-			// Fake the TaskExit event
-			container.Stop()
-		}
 		ctx := context.Background()
 		if test.cancel {
 			cancelledCtx, cancel := context.WithCancel(ctx)

pkg/server/events.go

@@ -235,4 +235,6 @@ func handleSandboxExit(e *eventtypes.TaskExit, sb sandboxstore.Sandbox) {
 		// TODO(random-liu): [P0] Enqueue the event and retry.
 		return
 	}
+	// Using channel to propagate the information of sandbox stop
+	sb.Stop()
 }

pkg/server/sandbox_stop.go

@@ -31,10 +31,6 @@ import (
 	sandboxstore "github.com/containerd/cri-containerd/pkg/store/sandbox"
 )
 
-// stopCheckPollInterval is the the interval to check whether a sandbox
-// is stopped successfully.
-const stopCheckPollInterval = 100 * time.Millisecond
-
 // StopPodSandbox stops the sandbox. If there are any running containers in the
 // sandbox, they should be forcibly terminated.
 func (c *criContainerdService) StopPodSandbox(ctx context.Context, r *runtime.StopPodSandboxRequest) (*runtime.StopPodSandboxResponse, error) {
@@ -125,25 +121,16 @@ func (c *criContainerdService) stopSandboxContainer(ctx context.Context, sandbox
 	return c.waitSandboxStop(ctx, sandbox, killContainerTimeout)
 }
 
-// waitSandboxStop polls sandbox state until timeout exceeds or sandbox is stopped.
+// waitSandboxStop waits for sandbox to be stopped until timeout exceeds or context is cancelled.
 func (c *criContainerdService) waitSandboxStop(ctx context.Context, sandbox sandboxstore.Sandbox, timeout time.Duration) error {
-	ticker := time.NewTicker(stopCheckPollInterval)
-	defer ticker.Stop()
 	timeoutTimer := time.NewTimer(timeout)
 	defer timeoutTimer.Stop()
-	for {
-		// Poll once before waiting for stopCheckPollInterval.
-		// TODO(random-liu): Use channel with event handler instead of polling.
-		if sandbox.Status.Get().State == sandboxstore.StateNotReady {
-			return nil
-		}
 	select {
 	case <-ctx.Done():
 		return fmt.Errorf("wait sandbox container %q is cancelled", sandbox.ID)
 	case <-timeoutTimer.C:
 		return fmt.Errorf("wait sandbox container %q stop timeout", sandbox.ID)
-		case <-ticker.C:
-			continue
-		}
+	case <-sandbox.Stopped():
+		return nil
 	}
 }

pkg/server/sandbox_stop_test.go

@@ -36,7 +36,7 @@ func TestWaitSandboxStop(t *testing.T) {
 	}{
 		"should return error if timeout exceeds": {
 			state:     sandboxstore.StateReady,
-			timeout:   2 * stopCheckPollInterval,
+			timeout:   200 * time.Millisecond,
 			expectErr: true,
 		},
 		"should return error if context is cancelled": {

pkg/store/container/container.go

@@ -39,7 +39,7 @@ type Container struct {
 	// Container IO
 	IO *cio.ContainerIO
 	// StopCh is used to propagate the stop information of the container.
-	StopCh
+	store.StopCh
 }
 
 // Opts sets specific information to newly created Container.
@@ -80,7 +80,7 @@ func WithStatus(status Status, root string) Opts {
 func NewContainer(metadata Metadata, opts ...Opts) (Container, error) {
 	c := Container{
 		Metadata: metadata,
-		StopCh:   StopCh(make(chan struct{})),
+		StopCh:   store.StopCh(make(chan struct{})),
 	}
 	for _, o := range opts {
 		if err := o(&c); err != nil {
@@ -95,19 +95,6 @@ func (c *Container) Delete() error {
 	return c.Status.Delete()
 }
 
-// StopCh is used to propagate the stop information of a container.
-type StopCh chan struct{}
-
-// Stop close stopCh of the container.
-func (ch StopCh) Stop() {
-	close(ch)
-}
-
-// Stopped return the stopCh of the container as a readonly channel.
-func (ch StopCh) Stopped() <-chan struct{} {
-	return ch
-}
-
 // Store stores all Containers.
 type Store struct {
 	lock       sync.RWMutex

pkg/store/container/fake_status.go

@@ -22,6 +22,10 @@ import "sync"
 func WithFakeStatus(status Status) Opts {
 	return func(c *Container) error {
 		c.Status = &fakeStatusStorage{status: status}
+		if status.FinishedAt != 0 {
+			// Fake the TaskExit event
+			c.Stop()
+		}
 		return nil
 	}
 }

pkg/store/sandbox/sandbox.go

@@ -36,15 +36,22 @@ type Sandbox struct {
 	Container containerd.Container
 	// CNI network namespace client
 	NetNS *NetNS
+	// StopCh is used to propagate the stop information of the sandbox.
+	store.StopCh
 }
 
 // NewSandbox creates an internally used sandbox type. This functions reminds
 // the caller that a sandbox must have a status.
 func NewSandbox(metadata Metadata, status Status) Sandbox {
-	return Sandbox{
+	s := Sandbox{
 		Metadata: metadata,
 		Status:   StoreStatus(status),
+		StopCh:   store.StopCh(make(chan struct{})),
 	}
+	if status.State == StateNotReady {
+		s.Stop()
+	}
+	return s
 }
 
 // Store stores all sandboxes.

pkg/store/util.go

@@ -0,0 +1,30 @@
+/*
+Copyright 2017 The Kubernetes 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 store
+
+// StopCh is used to propagate the stop information of a container.
+type StopCh chan struct{}
+
+// Stop close stopCh of the container.
+func (ch StopCh) Stop() {
+	close(ch)
+}
+
+// Stopped return the stopCh of the container as a readonly channel.
+func (ch StopCh) Stopped() <-chan struct{} {
+	return ch
+}