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// Copyright 2018 Google Inc.
//
// 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.
// Binary test_app is like a swiss knife for tests that need to run anything
// inside the sandbox. New functionality can be added with new commands.
package main
import (
"context"
"fmt"
"log"
"net"
"os"
"os/exec"
"strconv"
"time"
"flag"
"github.com/google/subcommands"
"gvisor.googlesource.com/gvisor/runsc/test/testutil"
)
func main() {
subcommands.Register(subcommands.HelpCommand(), "")
subcommands.Register(subcommands.FlagsCommand(), "")
subcommands.Register(new(uds), "")
subcommands.Register(new(taskTree), "")
flag.Parse()
exitCode := subcommands.Execute(context.Background())
os.Exit(int(exitCode))
}
type uds struct {
fileName string
socketPath string
}
// Name implements subcommands.Command.Name.
func (*uds) Name() string {
return "uds"
}
// Synopsis implements subcommands.Command.Synopsys.
func (*uds) Synopsis() string {
return "creates unix domain socket client and server. Client sends a contant flow of sequential numbers. Server prints them to --file"
}
// Usage implements subcommands.Command.Usage.
func (*uds) Usage() string {
return "uds <flags>"
}
// SetFlags implements subcommands.Command.SetFlags.
func (c *uds) SetFlags(f *flag.FlagSet) {
f.StringVar(&c.fileName, "file", "", "name of output file")
f.StringVar(&c.socketPath, "socket", "", "path to socket")
}
// Execute implements subcommands.Command.Execute.
func (c *uds) Execute(ctx context.Context, f *flag.FlagSet, args ...interface{}) subcommands.ExitStatus {
if c.fileName == "" || c.socketPath == "" {
log.Fatal("Flags cannot be empty, given: fileName: %q, socketPath: %q", c.fileName, c.socketPath)
return subcommands.ExitFailure
}
outputFile, err := os.OpenFile(c.fileName, os.O_WRONLY|os.O_CREATE, 0666)
if err != nil {
log.Fatal("error opening output file:", err)
}
defer os.Remove(c.socketPath)
listener, err := net.Listen("unix", c.socketPath)
if err != nil {
log.Fatal("error listening on socket %q:", c.socketPath, err)
}
go server(listener, outputFile)
for i := 0; ; i++ {
conn, err := net.Dial("unix", c.socketPath)
if err != nil {
log.Fatal("error dialing:", err)
}
if _, err := conn.Write([]byte(strconv.Itoa(i))); err != nil {
log.Fatal("error writing:", err)
}
conn.Close()
time.Sleep(100 * time.Millisecond)
}
}
func server(listener net.Listener, out *os.File) {
buf := make([]byte, 16)
for {
c, err := listener.Accept()
if err != nil {
log.Fatal("error accepting connection:", err)
}
nr, err := c.Read(buf)
if err != nil {
log.Fatal("error reading from buf:", err)
}
data := buf[0:nr]
fmt.Fprint(out, string(data)+"\n")
}
}
type taskTree struct {
depth int
width int
}
// Name implements subcommands.Command.
func (*taskTree) Name() string {
return "task-tree"
}
// Synopsis implements subcommands.Command.
func (*taskTree) Synopsis() string {
return "creates a tree of tasks"
}
// Usage implements subcommands.Command.
func (*taskTree) Usage() string {
return "task-tree <flags>"
}
// SetFlags implements subcommands.Command.
func (c *taskTree) SetFlags(f *flag.FlagSet) {
f.IntVar(&c.depth, "depth", 1, "number of levels to create")
f.IntVar(&c.width, "width", 1, "number of tasks at each level")
}
// Execute implements subcommands.Command.
func (c *taskTree) Execute(ctx context.Context, f *flag.FlagSet, args ...interface{}) subcommands.ExitStatus {
stop := testutil.StartReaper()
defer stop()
if c.depth == 0 {
log.Printf("Child sleeping, PID: %d\n", os.Getpid())
for {
time.Sleep(24 * time.Hour)
}
}
log.Printf("Parent %d sleeping, PID: %d\n", c.depth, os.Getpid())
var cmds []*exec.Cmd
for i := 0; i < c.width; i++ {
cmd := exec.Command(
"/proc/self/exe", c.Name(),
"--depth", strconv.Itoa(c.depth-1),
"--width", strconv.Itoa(c.width))
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
if err := cmd.Start(); err != nil {
log.Fatal("failed to call self:", err)
}
cmds = append(cmds, cmd)
}
for _, c := range cmds {
c.Wait()
}
return subcommands.ExitSuccess
}
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