Add crictl stats

Signed-off-by: Lantao Liu <lantaol@google.com>

cmd/crictl/main.go

@@ -110,6 +110,7 @@ func main() {
 		stopPodSandboxCommand,
 		updateContainerCommand,
 		configCommand,
+		statsCommand,
 	}
 
 	app.Flags = []cli.Flag{

cmd/crictl/stats.go

@@ -0,0 +1,192 @@
+/*
+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 main
+
+import (
+	"fmt"
+	"os"
+	"sort"
+	"strings"
+	"text/tabwriter"
+	"time"
+
+	"github.com/Sirupsen/logrus"
+	units "github.com/docker/go-units"
+	"github.com/urfave/cli"
+	"golang.org/x/net/context"
+	pb "k8s.io/kubernetes/pkg/kubelet/apis/cri/v1alpha1/runtime"
+)
+
+type statsOptions struct {
+	// all containers
+	all bool
+	// id of container
+	id string
+	// podID of container
+	podID string
+	// sample is the duration for sampling cpu usage.
+	sample time.Duration
+	// labels are selectors for the sandbox
+	labels map[string]string
+	// output format
+	output string
+}
+
+var statsCommand = cli.Command{
+	Name: "stats",
+	// TODO(random-liu): Support live monitoring of resource usage.
+	Usage: "List container(s) resource usage statistics",
+	Flags: []cli.Flag{
+		cli.BoolFlag{
+			Name:  "all, a",
+			Usage: "Show all containers (default shows just running)",
+		},
+		cli.StringFlag{
+			Name:  "id",
+			Value: "",
+			Usage: "Filter by container id",
+		},
+		cli.StringFlag{
+			Name:  "sandbox",
+			Value: "",
+			Usage: "Filter by sandbox id",
+		},
+		cli.StringSliceFlag{
+			Name:  "label",
+			Usage: "Filter by key=value label",
+		},
+		cli.StringFlag{
+			Name:  "output, o",
+			Usage: "Output format, One of: json|yaml|table",
+		},
+		cli.IntFlag{
+			Name:  "seconds, s",
+			Value: 1,
+			Usage: "Sample duration for CPU usage in seconds",
+		},
+	},
+	Action: func(context *cli.Context) error {
+		var err error
+		if err = getRuntimeClient(context); err != nil {
+			return err
+		}
+
+		opts := statsOptions{
+			all:    context.Bool("all"),
+			id:     context.String("id"),
+			podID:  context.String("sandbox"),
+			sample: time.Duration(context.Int("seconds")) * time.Second,
+			output: context.String("output"),
+		}
+		opts.labels, err = parseLabelStringSlice(context.StringSlice("label"))
+		if err != nil {
+			return err
+		}
+
+		if err = ContainerStats(runtimeClient, opts); err != nil {
+			return fmt.Errorf("get container stats failed: %v", err)
+		}
+		return nil
+	},
+}
+
+type containerStatsByID []*pb.ContainerStats
+
+func (c containerStatsByID) Len() int      { return len(c) }
+func (c containerStatsByID) Swap(i, j int) { c[i], c[j] = c[j], c[i] }
+func (c containerStatsByID) Less(i, j int) bool {
+	return c[i].Attributes.Id < c[j].Attributes.Id
+}
+
+// ContainerStats sends a ListContainerStatsRequest to the server, and
+// parses the returned ListContainerStatsResponse.
+func ContainerStats(client pb.RuntimeServiceClient, opts statsOptions) error {
+	filter := &pb.ContainerStatsFilter{}
+	if opts.id != "" {
+		filter.Id = opts.id
+	}
+	if opts.podID != "" {
+		filter.PodSandboxId = opts.podID
+	}
+	if opts.labels != nil {
+		filter.LabelSelector = opts.labels
+	}
+	request := &pb.ListContainerStatsRequest{
+		Filter: filter,
+	}
+	logrus.Debugf("ListContainerStatsRequest: %v", request)
+	r, err := client.ListContainerStats(context.Background(), request)
+	logrus.Debugf("ListContainerResponse: %v", r)
+	if err != nil {
+		return err
+	}
+	sort.Sort(containerStatsByID(r.Stats))
+
+	switch opts.output {
+	case "json":
+		return outputProtobufObjAsJSON(r)
+	case "yaml":
+		return outputProtobufObjAsYAML(r)
+	}
+	oldStats := make(map[string]*pb.ContainerStats)
+	for _, s := range r.GetStats() {
+		oldStats[s.Attributes.Id] = s
+	}
+
+	time.Sleep(opts.sample)
+
+	logrus.Debugf("ListContainerStatsRequest: %v", request)
+	r, err = client.ListContainerStats(context.Background(), request)
+	logrus.Debugf("ListContainerResponse: %v", r)
+	if err != nil {
+		return err
+	}
+	sort.Sort(containerStatsByID(r.Stats))
+
+	w := tabwriter.NewWriter(os.Stdout, 20, 1, 3, ' ', 0)
+	// Use `+` to work around go vet bug
+	fmt.Fprintln(w, "CONTAINER\tCPU %"+"\tMEM\tDISK\tINODES")
+	for _, s := range r.GetStats() {
+		id := strings.TrimPrefix(s.Attributes.Id, "")[:truncatedIDLen]
+		cpu := s.GetCpu().GetUsageCoreNanoSeconds().GetValue()
+		mem := s.GetMemory().GetWorkingSetBytes().GetValue()
+		disk := s.GetWritableLayer().GetUsedBytes().GetValue()
+		inodes := s.GetWritableLayer().GetInodesUsed().GetValue()
+		if !opts.all && cpu == 0 && mem == 0 {
+			// Skip non-running container
+			continue
+		}
+		old, ok := oldStats[s.Attributes.Id]
+		if !ok {
+			// Skip new container
+			continue
+		}
+		var cpuPerc float64
+		if cpu != 0 {
+			// Only generate cpuPerc for running container
+			duration := s.GetCpu().GetTimestamp() - old.GetCpu().GetTimestamp()
+			if duration == 0 {
+				return fmt.Errorf("cpu stat is not updated during sample")
+			}
+			cpuPerc = float64(cpu-old.GetCpu().GetUsageCoreNanoSeconds().GetValue()) / float64(duration) * 100
+		}
+		fmt.Fprintf(w, "%s\t%.2f\t%s\t%s\t%d\n", id, cpuPerc, units.HumanSize(float64(mem)), units.HumanSize(float64(disk)), inodes)
+	}
+
+	w.Flush()
+	return nil
+}