112 lines
3.0 KiB
Go
112 lines
3.0 KiB
Go
// Copyright 2018 The gVisor Authors.
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package cmd
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import (
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"context"
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"encoding/json"
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"os"
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"time"
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"flag"
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"github.com/google/subcommands"
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"gvisor.dev/gvisor/pkg/log"
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"gvisor.dev/gvisor/runsc/boot"
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"gvisor.dev/gvisor/runsc/container"
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)
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// Events implements subcommands.Command for the "events" command.
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type Events struct {
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// The interval between stats reporting.
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intervalSec int
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// If true, events will print a single group of stats and exit.
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stats bool
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}
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// Name implements subcommands.Command.Name.
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func (*Events) Name() string {
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return "events"
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}
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// Synopsis implements subcommands.Command.Synopsis.
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func (*Events) Synopsis() string {
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return "display container events such as OOM notifications, cpu, memory, and IO usage statistics"
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}
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// Usage implements subcommands.Command.Usage.
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func (*Events) Usage() string {
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return `<container-id>
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Where "<container-id>" is the name for the instance of the container.
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The events command displays information about the container. By default the
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information is displayed once every 5 seconds.
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OPTIONS:
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`
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}
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// SetFlags implements subcommands.Command.SetFlags.
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func (evs *Events) SetFlags(f *flag.FlagSet) {
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f.IntVar(&evs.intervalSec, "interval", 5, "set the stats collection interval, in seconds")
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f.BoolVar(&evs.stats, "stats", false, "display the container's stats then exit")
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}
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// Execute implements subcommands.Command.Execute.
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func (evs *Events) Execute(ctx context.Context, f *flag.FlagSet, args ...interface{}) subcommands.ExitStatus {
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if f.NArg() != 1 {
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f.Usage()
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return subcommands.ExitUsageError
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}
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id := f.Arg(0)
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conf := args[0].(*boot.Config)
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c, err := container.Load(conf.RootDir, id)
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if err != nil {
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Fatalf("loading sandbox: %v", err)
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}
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// Repeatedly get stats from the container.
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for {
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// Get the event and print it as JSON.
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ev, err := c.Event()
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if err != nil {
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log.Warningf("Error getting events for container: %v", err)
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}
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// err must be preserved because it is used below when breaking
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// out of the loop.
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b, err := json.Marshal(ev)
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if err != nil {
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log.Warningf("Error while marshalling event %v: %v", ev, err)
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} else {
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os.Stdout.Write(b)
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}
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// If we're only running once, break. If we're only running
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// once and there was an error, the command failed.
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if evs.stats {
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if err != nil {
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return subcommands.ExitFailure
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}
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break
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}
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time.Sleep(time.Duration(evs.intervalSec) * time.Second)
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}
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return subcommands.ExitSuccess
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}
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