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_list.go

@@ -0,0 +1,116 @@
+/*
+   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/containerd/containerd/api/types"
+	"github.com/pkg/errors"
+	"golang.org/x/net/context"
+	runtime "k8s.io/cri-api/pkg/apis/runtime/v1alpha2"
+
+	containerstore "github.com/containerd/containerd/pkg/cri/store/container"
+)
+
+// ListContainerStats returns stats of all running containers.
+func (c *criService) ListContainerStats(
+	ctx context.Context,
+	in *runtime.ListContainerStatsRequest,
+) (*runtime.ListContainerStatsResponse, error) {
+	request, containers, err := c.buildTaskMetricsRequest(in)
+	if err != nil {
+		return nil, errors.Wrap(err, "failed to build metrics request")
+	}
+	resp, err := c.client.TaskService().Metrics(ctx, &request)
+	if err != nil {
+		return nil, errors.Wrap(err, "failed to fetch metrics for tasks")
+	}
+	criStats, err := c.toCRIContainerStats(resp.Metrics, containers)
+	if err != nil {
+		return nil, errors.Wrap(err, "failed to convert to cri containerd stats format")
+	}
+	return criStats, nil
+}
+
+func (c *criService) toCRIContainerStats(
+	stats []*types.Metric,
+	containers []containerstore.Container,
+) (*runtime.ListContainerStatsResponse, error) {
+	statsMap := make(map[string]*types.Metric)
+	for _, stat := range stats {
+		statsMap[stat.ID] = stat
+	}
+	containerStats := new(runtime.ListContainerStatsResponse)
+	for _, cntr := range containers {
+		cs, err := c.containerMetrics(cntr.Metadata, statsMap[cntr.ID])
+		if err != nil {
+			return nil, errors.Wrapf(err, "failed to decode container metrics for %q", cntr.ID)
+		}
+		containerStats.Stats = append(containerStats.Stats, cs)
+	}
+	return containerStats, nil
+}
+
+func (c *criService) normalizeContainerStatsFilter(filter *runtime.ContainerStatsFilter) {
+	if cntr, err := c.containerStore.Get(filter.GetId()); err == nil {
+		filter.Id = cntr.ID
+	}
+	if sb, err := c.sandboxStore.Get(filter.GetPodSandboxId()); err == nil {
+		filter.PodSandboxId = sb.ID
+	}
+}
+
+// buildTaskMetricsRequest constructs a tasks.MetricsRequest based on
+// the information in the stats request and the containerStore
+func (c *criService) buildTaskMetricsRequest(
+	r *runtime.ListContainerStatsRequest,
+) (tasks.MetricsRequest, []containerstore.Container, error) {
+	var req tasks.MetricsRequest
+	if r.GetFilter() == nil {
+		return req, nil, nil
+	}
+	c.normalizeContainerStatsFilter(r.GetFilter())
+	var containers []containerstore.Container
+	for _, cntr := range c.containerStore.List() {
+		if r.GetFilter().GetId() != "" && cntr.ID != r.GetFilter().GetId() {
+			continue
+		}
+		if r.GetFilter().GetPodSandboxId() != "" && cntr.SandboxID != r.GetFilter().GetPodSandboxId() {
+			continue
+		}
+		if r.GetFilter().GetLabelSelector() != nil &&
+			!matchLabelSelector(r.GetFilter().GetLabelSelector(), cntr.Config.GetLabels()) {
+			continue
+		}
+		containers = append(containers, cntr)
+		req.Filters = append(req.Filters, "id=="+cntr.ID)
+	}
+	return req, containers, nil
+}
+
+func matchLabelSelector(selector, labels map[string]string) bool {
+	for k, v := range selector {
+		if val, ok := labels[k]; ok {
+			if v != val {
+				return false
+			}
+		} else {
+			return false
+		}
+	}
+	return true
+}