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package main
import (
"flag"
"fmt"
"log"
"net/http"
"net/url"
"os"
"os/signal"
"syscall"
"time"
"github.com/gorilla/websocket"
"golang.org/x/crypto/ssh/terminal"
)
var addr = flag.String("addr", "localhost:8080", "http service address")
func main() {
flag.Parse()
log.SetFlags(0)
interrupt := make(chan os.Signal, 1)
signal.Notify(interrupt, os.Interrupt)
signal.Notify(interrupt, syscall.SIGTERM)
u := url.URL{Scheme: "ws", Host: *addr, Path: "/"}
log.Printf("connecting to %s. `kill -15 %d` to stop", u.String(), os.Getpid())
proto := make(http.Header)
proto.Add("Sec-WebSocket-Protocol", "binary")
c, _, err := websocket.DefaultDialer.Dial(u.String(), proto)
if err != nil {
log.Fatal("dial:", err)
}
defer c.Close()
oldState, err := terminal.MakeRaw(0)
if err != nil {
fmt.Println("Cannot set input terminal in raw mode")
}
defer terminal.Restore(0, oldState)
done := make(chan struct{})
go func() {
defer close(done)
for {
_, message, err := c.ReadMessage()
if err != nil {
log.Println("read:", err)
return
}
fmt.Fprintf(os.Stdout, "%s", message)
}
}()
for {
select {
case <-done:
return
case <-interrupt:
log.Println("interrupt")
// Cleanly close the connection by sending a close message and then
// waiting (with timeout) for the server to close the connection.
err := c.WriteMessage(websocket.CloseMessage, websocket.FormatCloseMessage(websocket.CloseNormalClosure, ""))
if err != nil {
log.Println("write close:", err)
return
}
select {
case <-done:
case <-time.After(time.Second):
}
return
default:
buf := make([]byte, 128)
n, err := os.Stdin.Read(buf)
err = c.WriteMessage(websocket.BinaryMessage, buf[:n])
if err != nil {
log.Println("write:", err)
return
}
}
}
}
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