Move uds_test_app to common test_app

This was done so it's easier to add more functionality
to this file for other tests.

PiperOrigin-RevId: 214782043
Change-Id: I1f38b9ee1219b3ce7b789044ada8e52bdc1e6279

1 files changed, 116 insertions, 0 deletions

diff --git a/runsc/container/test_app.go b/runsc/container/test_app.go
new file mode 100644
index 000000000..768293cf9
--- /dev/null
+++ b/runsc/container/test_app.go
@@ -0,0 +1,116 @@
+// 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"
+	"strconv"
+	"time"
+
+	"flag"
+	"github.com/google/subcommands"
+)
+
+func main() {
+	subcommands.Register(subcommands.HelpCommand(), "")
+	subcommands.Register(subcommands.FlagsCommand(), "")
+	subcommands.Register(new(uds), "")
+
+	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")
+	}
+}