Move cri server packages under pkg/cri

Organizes the cri related server packages under pkg/cri

Signed-off-by: Derek McGowan <derek@mcg.dev>

pkg/cri/server/container_stats.go

@@ -0,0 +1,47 @@
+/*
+   Copyright The containerd 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 server
+
+import (
+	tasks "github.com/containerd/containerd/api/services/tasks/v1"
+	"github.com/pkg/errors"
+	"golang.org/x/net/context"
+	runtime "k8s.io/cri-api/pkg/apis/runtime/v1alpha2"
+)
+
+// ContainerStats returns stats of the container. If the container does not
+// exist, the call returns an error.
+func (c *criService) ContainerStats(ctx context.Context, in *runtime.ContainerStatsRequest) (*runtime.ContainerStatsResponse, error) {
+	cntr, err := c.containerStore.Get(in.GetContainerId())
+	if err != nil {
+		return nil, errors.Wrap(err, "failed to find container")
+	}
+	request := &tasks.MetricsRequest{Filters: []string{"id==" + cntr.ID}}
+	resp, err := c.client.TaskService().Metrics(ctx, request)
+	if err != nil {
+		return nil, errors.Wrap(err, "failed to fetch metrics for task")
+	}
+	if len(resp.Metrics) != 1 {
+		return nil, errors.Errorf("unexpected metrics response: %+v", resp.Metrics)
+	}
+
+	cs, err := c.containerMetrics(cntr.Metadata, resp.Metrics[0])
+	if err != nil {
+		return nil, errors.Wrap(err, "failed to decode container metrics")
+	}
+	return &runtime.ContainerStatsResponse{Stats: cs}, nil
+}