Update CRI API to support Evented PLEG

Signed-off-by: Harshal Patil <harpatil@redhat.com>

pkg/kubelet/cri/remote/fake/fake_runtime.go

@@ -332,3 +332,7 @@ func (f *RemoteRuntime) CheckpointContainer(ctx context.Context, req *kubeapi.Ch
 
 	return &kubeapi.CheckpointContainerResponse{}, nil
 }
+
+func (f *RemoteRuntime) GetContainerEvents(req *kubeapi.GetEventsRequest, ces kubeapi.RuntimeService_GetContainerEventsServer) error {
+	return nil
+}

pkg/kubelet/cri/remote/remote_runtime.go

@@ -1208,3 +1208,7 @@ func (r *remoteRuntimeService) CheckpointContainer(options *runtimeapi.Checkpoin
 
 	return nil
 }
+
+func (r *remoteRuntimeService) GetContainerEvents(containerEventsCh chan *runtimeapi.ContainerEventResponse) error {
+	return nil
+}

pkg/kubelet/kuberuntime/instrumented_services.go

@@ -333,3 +333,12 @@ func (in instrumentedRuntimeService) CheckpointContainer(options *runtimeapi.Che
 	recordError(operation, err)
 	return err
 }
+
+func (in instrumentedRuntimeService) GetContainerEvents(containerEventsCh chan *runtimeapi.ContainerEventResponse) error {
+	const operation = "get_container_events"
+	defer recordOperation(operation, time.Now())
+
+	err := in.service.GetContainerEvents(containerEventsCh)
+	recordError(operation, err)
+	return err
+}

staging/src/k8s.io/cri-api/pkg/apis/runtime/v1/api.proto

@@ -117,6 +117,10 @@ service RuntimeService {
 
     // CheckpointContainer checkpoints a container
     rpc CheckpointContainer(CheckpointContainerRequest) returns (CheckpointContainerResponse) {}
+
+    // GetContainerEvents gets container events from the CRI runtime
+    rpc  GetContainerEvents(GetEventsRequest) returns (stream ContainerEventResponse) {}
+
 }
 
 // ImageService defines the public APIs for managing images.
@@ -1559,3 +1563,33 @@ message CheckpointContainerRequest {
 }
 
 message CheckpointContainerResponse {}
+
+message GetEventsRequest {}
+
+message ContainerEventResponse {
+    // ID of the container
+    string container_id = 1;
+
+    // Type of the container event
+    ContainerEventType container_event_type = 2;
+
+    // Creation timestamp of this event
+    int64 created_at = 3;
+
+    // ID of the sandbox container
+    PodSandboxMetadata pod_sandbox_metadata = 4;
+}
+
+enum ContainerEventType {
+    // Container created
+    CONTAINER_CREATED_EVENT = 0;
+
+    // Container started
+    CONTAINER_STARTED_EVENT = 1;
+
+    // Container stopped
+    CONTAINER_STOPPED_EVENT = 2;
+
+    // Container deleted
+    CONTAINER_DELETED_EVENT = 3;
+}

staging/src/k8s.io/cri-api/pkg/apis/services.go

@@ -58,6 +58,8 @@ type ContainerManager interface {
 	ReopenContainerLog(ContainerID string) error
 	// CheckpointContainer checkpoints a container
 	CheckpointContainer(options *runtimeapi.CheckpointContainerRequest) error
+	// GetContainerEvents gets container events from the CRI runtime
+	GetContainerEvents(containerEventsCh chan *runtimeapi.ContainerEventResponse) error
 }
 
 // PodSandboxManager contains methods for operating on PodSandboxes. The methods

staging/src/k8s.io/cri-api/pkg/apis/testing/fake_runtime_service.go

@@ -708,3 +708,7 @@ func (r *FakeRuntimeService) CheckpointContainer(options *runtimeapi.CheckpointC
 
 	return nil
 }
+
+func (f *FakeRuntimeService) GetContainerEvents(containerEventsCh chan *runtimeapi.ContainerEventResponse) error {
+	return nil
+}