117 lines
3.0 KiB
Go
117 lines
3.0 KiB
Go
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// Copyright 2018 Google Inc.
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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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// Binary test_app is like a swiss knife for tests that need to run anything
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// inside the sandbox. New functionality can be added with new commands.
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package main
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import (
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"context"
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"fmt"
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"log"
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"net"
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"os"
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"strconv"
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"time"
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"flag"
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"github.com/google/subcommands"
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)
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func main() {
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subcommands.Register(subcommands.HelpCommand(), "")
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subcommands.Register(subcommands.FlagsCommand(), "")
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subcommands.Register(new(uds), "")
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flag.Parse()
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exitCode := subcommands.Execute(context.Background())
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os.Exit(int(exitCode))
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}
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type uds struct {
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fileName string
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socketPath string
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}
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// Name implements subcommands.Command.Name.
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func (*uds) Name() string {
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return "uds"
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}
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// Synopsis implements subcommands.Command.Synopsys.
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func (*uds) Synopsis() string {
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return "creates unix domain socket client and server. Client sends a contant flow of sequential numbers. Server prints them to --file"
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}
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// Usage implements subcommands.Command.Usage.
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func (*uds) Usage() string {
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return "uds <flags>"
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}
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// SetFlags implements subcommands.Command.SetFlags.
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func (c *uds) SetFlags(f *flag.FlagSet) {
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f.StringVar(&c.fileName, "file", "", "name of output file")
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f.StringVar(&c.socketPath, "socket", "", "path to socket")
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}
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// Execute implements subcommands.Command.Execute.
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func (c *uds) Execute(ctx context.Context, f *flag.FlagSet, args ...interface{}) subcommands.ExitStatus {
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if c.fileName == "" || c.socketPath == "" {
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log.Fatal("Flags cannot be empty, given: fileName: %q, socketPath: %q", c.fileName, c.socketPath)
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return subcommands.ExitFailure
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}
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outputFile, err := os.OpenFile(c.fileName, os.O_WRONLY|os.O_CREATE, 0666)
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if err != nil {
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log.Fatal("error opening output file:", err)
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}
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defer os.Remove(c.socketPath)
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listener, err := net.Listen("unix", c.socketPath)
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if err != nil {
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log.Fatal("error listening on socket %q:", c.socketPath, err)
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}
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go server(listener, outputFile)
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for i := 0; ; i++ {
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conn, err := net.Dial("unix", c.socketPath)
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if err != nil {
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log.Fatal("error dialing:", err)
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}
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if _, err := conn.Write([]byte(strconv.Itoa(i))); err != nil {
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log.Fatal("error writing:", err)
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}
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conn.Close()
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time.Sleep(100 * time.Millisecond)
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}
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}
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func server(listener net.Listener, out *os.File) {
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buf := make([]byte, 16)
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for {
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c, err := listener.Accept()
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if err != nil {
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log.Fatal("error accepting connection:", err)
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}
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nr, err := c.Read(buf)
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if err != nil {
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log.Fatal("error reading from buf:", err)
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}
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data := buf[0:nr]
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fmt.Fprint(out, string(data)+"\n")
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}
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}
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