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// Copyright 2021 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"
"fmt"
"os"
"github.com/google/subcommands"
"gvisor.dev/gvisor/runsc/config"
"gvisor.dev/gvisor/runsc/container"
"gvisor.dev/gvisor/runsc/flag"
)
// Usage implements subcommands.Command for the "usage" command.
type Usage struct {
full bool
fd bool
}
// Name implements subcommands.Command.Name.
func (*Usage) Name() string {
return "usage"
}
// Synopsis implements subcommands.Command.Synopsis.
func (*Usage) Synopsis() string {
return "Usage shows application memory usage across various categories in bytes."
}
// Usage implements subcommands.Command.Usage.
func (*Usage) Usage() string {
return `usage [flags] <container id> - print memory usages to standard output.`
}
// SetFlags implements subcommands.Command.SetFlags.
func (u *Usage) SetFlags(f *flag.FlagSet) {
f.BoolVar(&u.full, "full", false, "enumerate all usage by categories")
f.BoolVar(&u.fd, "fd", false, "retrieves a subset of usage through the established usage FD")
}
// Execute implements subcommands.Command.Execute.
func (u *Usage) Execute(_ 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].(*config.Config)
cont, err := container.Load(conf.RootDir, container.FullID{ContainerID: id}, container.LoadOpts{})
if err != nil {
Fatalf("loading container: %v", err)
}
if !u.fd {
m, err := cont.Usage(u.full)
if err != nil {
Fatalf("usage failed: %v", err)
}
if err := json.NewEncoder(os.Stdout).Encode(m); err != nil {
Fatalf("Encode MemoryUsage failed: %v", err)
}
} else {
m, err := cont.UsageFD()
if err != nil {
Fatalf("usagefd failed: %v", err)
}
mapped, unknown, total, err := m.Fetch()
if err != nil {
Fatalf("Fetch memory usage failed: %v", err)
}
fmt.Printf("Mapped %v, Unknown %v, Total %v\n", mapped, unknown, total)
}
return subcommands.ExitSuccess
}
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