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module versestudios.com/go-telnet-asyncio-test
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go 1.16
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require github.com/xtaci/gaio v1.2.9
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package main
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import (
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"bufio"
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"flag"
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"io"
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"log"
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"net"
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"os/exec"
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"strconv"
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"sync"
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"time"
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"github.com/xtaci/gaio"
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)
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func main() {
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port := flag.Int("port", 3333, "Port to accept connections on.")
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host := flag.String("host", "127.0.0.1", "Host or IP to bind to")
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flag.Parse()
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w, err := gaio.NewWatcher()
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if err != nil {
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log.Fatal(err)
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}
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defer w.Close()
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l, err := net.Listen("tcp", *host+":"+strconv.Itoa(*port))
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if err != nil {
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log.Panicln(err)
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}
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log.Println("Listening to connections at '"+*host+"' on port", strconv.Itoa(*port))
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defer l.Close()
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for {
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conn, err := l.Accept()
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if err != nil {
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log.Panicln(err)
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}
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log.Println("new client", conn.RemoteAddr())
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// set up io channel for this connection
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chIO := make(chan gaio.OpResult)
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// submit the first async write IO request
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err = (chIO, conn, welcomeHandler())
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if err != nil {
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log.Printf("err sending welcomeHandler: %v\n", err)
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return
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}
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// hand off channel to menuHandler
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menuHandler(chIO, conn, *w)
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}
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}
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func menuHandler(chIO chan gaio.OpResult, c net.Conn, w gaio.Watcher) {
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log.Printf("Connection received: %s", c.RemoteAddr())
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// watcher.WaitIO goroutine
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go func() {
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for {
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results, err := w.WaitIO()
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if err != nil {
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log.Println(err)
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return
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}
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for _, res := range results {
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chIO <- res
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}
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}
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}()
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// send welcome banner
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if err := welcomeHandler(&c); err != nil {
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log.Printf("error sending welcomeHandler on initial connect: %v", err)
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}
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wg := new(sync.WaitGroup)
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wg.Add(1)
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go func() {
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defer wg.Done()
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scanner := bufio.NewScanner(c)
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scanner.Split(bufio.ScanLines)
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for scanner.Scan() {
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line := scanner.Bytes()
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log.Printf("Menu received line: %v (%v)", line, string(line))
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switch string(line) {
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case "welcome":
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if err := welcomeHandler(&c); err != nil {
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log.Printf("error sending welcomeHandler from cmd `welcome`: %v", err)
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}
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case "adventure":
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// start the door and wait
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log.Printf("starting door handler...")
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if err := doorHandler(&c); err != nil {
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log.Printf("error from cmd `adventure`: %v", err)
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}
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log.Printf("returning from door")
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n, err := c.Write([]byte("\n\n> "))
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if err != nil {
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log.Printf("error writing to connection: %v", err)
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} else {
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log.Printf("wrote %d byte prompt to connection", n)
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}
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case "exit":
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if err := exitHandler(c); err != nil {
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log.Printf("error sending exitHandler from cmd `exit`: %v", err)
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}
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default:
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n, err := c.Write([]byte("huh?\n\n> "))
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if err != nil {
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log.Printf("error writing to connection: %v", err)
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} else {
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log.Printf("wrote %d bytes to connection", n)
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}
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}
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}
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}()
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time.Sleep(time.Millisecond)
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wg.Wait()
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log.Printf("Goodbye %s!", c.RemoteAddr())
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}
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func sendClientText(c net.Conn, s string) error {
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n, err := c.Write([]byte(s))
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if err != nil { // svr.ListenAndServe()
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log.Printf("error writing to connection: %v", err)
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return err
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} else {
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log.Printf("wrote %d bytes to connection", n)
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}
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return nil
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}
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func welcomeHandler(c *net.Conn) error {
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const bannerText = "\x1b[2J\x1b[H\x1b[31m\x1b[J\r\n" + `
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_ __ _ ` + "" + `
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| | / /__ / /________ ____ ___ ___` + "" + `
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| | /| / / _ \/ / ___/ __ \/ __ '__ \/ _ \` + "" + `
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| |/ |/ / __/ / /__/ /_/ / / / / / / __/` + "" + `
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|__/|__/\___/_/\___/\____/_/ /_/ /_/\___/` + "\r\n\x1b[33m" + `
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__` + "" + `
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/ /_____ ` + "" + `
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/ __/ __ \` + "" + `
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/ /_/ /_/ /` + "" + `
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\__/\____/` + "\x1b[35m\r\n" + `
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_ __` + "" + `
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| | / /__ _____________` + "" + `
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| | / / _ \/ ___/ ___/ _ \` + "" + `
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| |/ / __/ / (__ ) __/` + "" + `
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|___/\___/_/ /____/\___/` + "\x1b[37m\r\n" + `
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_____ __ ___` + "" + `
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/ ___// /___ ______/ (_)___ _____` + "" + `
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\__ \/ __/ / / / __ / / __ \/ ___/` + "" + `
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___/ / /_/ /_/ / /_/ / / /_/ (__ ) ` + "" + `
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/____/\__/\__,_/\__,_/_/\____/____/ ` + "\x1b[32m\r\n\r\n\r\n" + `
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Help is available: type help` + "\r\n\r\n> "
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err := sendClientText(*c, bannerText)
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if err != nil {
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log.Printf("error writing to connection: %v", err)
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}
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return nil
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}
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func exitHandler(c net.Conn) error {
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const exitMessage = "\x1b[2J\x1b[H\x1b[31m\x1b[J\r\n" + `
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___| | |
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\___ \ _ \ _ \ | | _ \ | | __| __ \ _' | __| _ \ __| _ \\ \ \ / __ \ _ \ | | |
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| __/ __/ | | ( | | | \__ \ | | ( | ( __/ ( ( |\ \ \ / | | ( | | |_|
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_____/ \___|\___| \__, |\___/ \__,_| ) ____/ .__/ \__,_|\___|\___| \___|\___/ \_/\_/ _.__/ \___/ \__, |_)
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____/ / _| ____/
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`
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err := sendClientText(c, exitMessage)
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if err != nil {
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log.Printf("error writing to connection: %v", err)
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}
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time.Sleep(500 * time.Millisecond)
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return c.Close()
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}
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func doorHandler(c *net.Conn) error {
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const bannerText = "\r\nCOLOSSAL CAVE\r\n\r\n"
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err := sendClientText(*c, bannerText)
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if err != nil {
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log.Printf("error writing to connection: %v\n", err)
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}
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cmd := exec.Command("/usr/games/adventure")
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stdout, _ := cmd.StdoutPipe()
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stdin, _ := cmd.StdinPipe()
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cmd.Start()
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Terminator := make(chan bool)
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wg := new(sync.WaitGroup)
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wg.Add(1)
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go func(c net.Conn, Terminator *chan bool, wg *sync.WaitGroup) {
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log.Println("starting stdin reader goroutine")
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defer wg.Done()
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Check:
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for {
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select {
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case <-*Terminator:
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break Check
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default:
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time.Sleep(time.Second)
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inBuf := make([]byte, 80)
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var l int
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if l, err = c.Read(inBuf); err != nil {
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if err == io.EOF {
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log.Println("connection closed?")
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break Check
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} else {
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log.Printf("error reading conn: %v\n", err)
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break Check
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}
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}
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if l > 0 {
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log.Printf("writing %d bytes to stdin: %v\n", l, string(inBuf[:l]))
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stdin.Write(inBuf[:l])
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}
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}
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}
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log.Println("exiting stdin reader goroutine")
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}(*c, &Terminator, wg)
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log.Println("starting stdout reader goroutine")
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scanner := bufio.NewScanner(stdout)
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scanner.Split(bufio.ScanLines)
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for scanner.Scan() {
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m := scanner.Bytes()
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(*c).Write(m)
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(*c).Write([]byte{'\n'})
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log.Printf("wrote %d bytes to stdout: %v\n", len(m)+1, string(m))
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}
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log.Println("exiting stdout reader goroutine")
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Terminator <- true
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log.Println("waiting for wg")
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wg.Wait()
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log.Println("waiting for cmd")
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exitErr := cmd.Wait()
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if exitErr != nil {
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log.Printf("cmd exited with err: %v\n", exitErr)
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}
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return nil
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}
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