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