109 lines
2.8 KiB
Go
109 lines
2.8 KiB
Go
// +build linux
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/*
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Copyright The containerd Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package tasks
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import (
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"encoding/json"
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"errors"
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"fmt"
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"os"
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"text/tabwriter"
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"github.com/containerd/cgroups"
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"github.com/containerd/containerd/cmd/ctr/commands"
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"github.com/containerd/typeurl"
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"github.com/urfave/cli"
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)
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func init() {
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// metricsCommand is only added on Linux as github.com/containerd/cgroups
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// does not compile on darwin or windows
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Command.Subcommands = append(Command.Subcommands, metricsCommand)
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}
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const (
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formatFlag = "format"
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formatTable = "table"
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formatJSON = "json"
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)
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var metricsCommand = cli.Command{
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Name: "metrics",
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Usage: "get a single data point of metrics for a task with the built-in Linux runtime",
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ArgsUsage: "CONTAINER",
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Aliases: []string{"metric"},
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Flags: []cli.Flag{
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cli.StringFlag{
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Name: formatFlag,
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Usage: `"table" or "json"`,
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Value: formatTable,
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},
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},
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Action: func(context *cli.Context) error {
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client, ctx, cancel, err := commands.NewClient(context)
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if err != nil {
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return err
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}
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defer cancel()
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container, err := client.LoadContainer(ctx, context.Args().First())
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if err != nil {
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return err
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}
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task, err := container.Task(ctx, nil)
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if err != nil {
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return err
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}
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metric, err := task.Metrics(ctx)
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if err != nil {
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return nil
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}
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anydata, err := typeurl.UnmarshalAny(metric.Data)
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if err != nil {
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return err
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}
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data, ok := anydata.(*cgroups.Metrics)
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if !ok {
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return errors.New("cannot convert metric data to cgroups.Metrics")
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}
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switch context.String(formatFlag) {
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case formatTable:
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w := tabwriter.NewWriter(os.Stdout, 1, 8, 4, ' ', 0)
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fmt.Fprintf(w, "ID\tTIMESTAMP\t\n")
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fmt.Fprintf(w, "%s\t%s\t\n\n", metric.ID, metric.Timestamp)
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fmt.Fprintf(w, "METRIC\tVALUE\t\n")
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fmt.Fprintf(w, "memory.usage_in_bytes\t%d\t\n", data.Memory.Usage.Usage)
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fmt.Fprintf(w, "memory.stat.cache\t%d\t\n", data.Memory.TotalCache)
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fmt.Fprintf(w, "cpuacct.usage\t%d\t\n", data.CPU.Usage.Total)
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fmt.Fprintf(w, "cpuacct.usage_percpu\t%v\t\n", data.CPU.Usage.PerCPU)
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return w.Flush()
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case formatJSON:
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marshaledJSON, err := json.MarshalIndent(data, "", " ")
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if err != nil {
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return err
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}
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fmt.Println(string(marshaledJSON))
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return nil
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default:
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return errors.New("format must be table or json")
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}
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},
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}
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