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/*
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 tasks
import (
"encoding/json"
"errors"
"fmt"
"os"
"text/tabwriter"
v1 "github.com/containerd/cgroups/stats/v1"
v2 "github.com/containerd/cgroups/v2/stats"
"github.com/containerd/containerd/cmd/ctr/commands"
"github.com/containerd/typeurl"
"github.com/urfave/cli"
)
func init() {
// metricsCommand is only added on Linux as github.com/containerd/cgroups
// does not compile on darwin or windows
Command.Subcommands = append(Command.Subcommands, metricsCommand)
}
const (
formatFlag = "format"
formatTable = "table"
formatJSON = "json"
)
var metricsCommand = cli.Command{
Name: "metrics",
Usage: "get a single data point of metrics for a task with the built-in Linux runtime",
ArgsUsage: "CONTAINER",
Aliases: []string{"metric"},
Flags: []cli.Flag{
cli.StringFlag{
Name: formatFlag,
Usage: `"table" or "json"`,
Value: formatTable,
},
},
Action: func(context *cli.Context) error {
client, ctx, cancel, err := commands.NewClient(context)
if err != nil {
return err
}
defer cancel()
container, err := client.LoadContainer(ctx, context.Args().First())
if err != nil {
return err
}
task, err := container.Task(ctx, nil)
if err != nil {
return err
}
metric, err := task.Metrics(ctx)
if err != nil {
return err
}
anydata, err := typeurl.UnmarshalAny(metric.Data)
if err != nil {
return err
}
var (
data *v1.Metrics
data2 *v2.Metrics
)
switch v := anydata.(type) {
case *v1.Metrics:
data = v
case *v2.Metrics:
data2 = v
default:
return errors.New("cannot convert metric data to cgroups.Metrics or windows.Statistics")
}
switch context.String(formatFlag) {
case formatTable:
w := tabwriter.NewWriter(os.Stdout, 1, 8, 4, ' ', 0)
fmt.Fprintf(w, "ID\tTIMESTAMP\t\n")
fmt.Fprintf(w, "%s\t%s\t\n\n", metric.ID, metric.Timestamp)
if data != nil {
printCgroupMetricsTable(w, data)
} else if data2 != nil {
printCgroup2MetricsTable(w, data2)
}
return w.Flush()
case formatJSON:
marshaledJSON, err := json.MarshalIndent(anydata, "", " ")
if err != nil {
return err
}
fmt.Println(string(marshaledJSON))
return nil
default:
return errors.New("format must be table or json")
}
},
}
func printCgroupMetricsTable(w *tabwriter.Writer, data *v1.Metrics) {
fmt.Fprintf(w, "METRIC\tVALUE\t\n")
if data.Memory != nil {
fmt.Fprintf(w, "memory.usage_in_bytes\t%d\t\n", data.Memory.Usage.Usage)
fmt.Fprintf(w, "memory.limit_in_bytes\t%d\t\n", data.Memory.Usage.Limit)
fmt.Fprintf(w, "memory.stat.cache\t%d\t\n", data.Memory.TotalCache)
}
if data.CPU != nil {
fmt.Fprintf(w, "cpuacct.usage\t%d\t\n", data.CPU.Usage.Total)
fmt.Fprintf(w, "cpuacct.usage_percpu\t%v\t\n", data.CPU.Usage.PerCPU)
}
if data.Pids != nil {
fmt.Fprintf(w, "pids.current\t%v\t\n", data.Pids.Current)
fmt.Fprintf(w, "pids.limit\t%v\t\n", data.Pids.Limit)
}
}
func printCgroup2MetricsTable(w *tabwriter.Writer, data *v2.Metrics) {
fmt.Fprintf(w, "METRIC\tVALUE\t\n")
if data.Pids != nil {
fmt.Fprintf(w, "pids.current\t%v\t\n", data.Pids.Current)
fmt.Fprintf(w, "pids.limit\t%v\t\n", data.Pids.Limit)
}
if data.CPU != nil {
fmt.Fprintf(w, "cpu.usage_usec\t%v\t\n", data.CPU.UsageUsec)
fmt.Fprintf(w, "cpu.user_usec\t%v\t\n", data.CPU.UserUsec)
fmt.Fprintf(w, "cpu.system_usec\t%v\t\n", data.CPU.SystemUsec)
fmt.Fprintf(w, "cpu.nr_periods\t%v\t\n", data.CPU.NrPeriods)
fmt.Fprintf(w, "cpu.nr_throttled\t%v\t\n", data.CPU.NrThrottled)
fmt.Fprintf(w, "cpu.throttled_usec\t%v\t\n", data.CPU.ThrottledUsec)
}
if data.Memory != nil {
fmt.Fprintf(w, "memory.usage\t%v\t\n", data.Memory.Usage)
fmt.Fprintf(w, "memory.usage_limit\t%v\t\n", data.Memory.UsageLimit)
fmt.Fprintf(w, "memory.swap_usage\t%v\t\n", data.Memory.SwapUsage)
fmt.Fprintf(w, "memory.swap_limit\t%v\t\n", data.Memory.SwapLimit)
}
}
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