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ws.go
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package main
import (
"fmt"
"io"
"net"
"net/http"
"github.com/gobwas/ws"
"github.com/gobwas/ws/wsutil"
)
type wsio struct {
conn net.Conn
isStdErr bool
}
func (ws *wsio) Read(p []byte) (n int, err error) {
r, err := wsutil.ReadClientText(ws.conn)
if err != nil {
fmt.Println("Failed to read data from ws", err)
return 0, err
}
var copylen int
if cap(p) < len(r) {
copylen = cap(p)
if cfg.debug {
fmt.Println("stdin buffer is small than ws readed data")
}
} else {
copylen = len(r)
}
copy(p, r[:copylen])
if cfg.debug {
fmt.Println("Readed", copylen, "bytes from ws:", p)
}
return copylen, err
}
func (ws *wsio) Write(p []byte) (n int, err error) {
err = wsutil.WriteServerText(ws.conn, p)
if err != nil {
fmt.Println("Failed to write data", p, "to ws", err, "is stderr", ws.isStdErr)
return 0, err
}
if cfg.debug {
fmt.Println("Writed", p, "to", func() string {
if ws.isStdErr {
return "stderr"
} else {
return "stdout"
}
}())
}
return len(p), err
}
func getWsEcho(conn io.ReadWriter, write string) (string, error) {
wmsg := []byte(write)
var op = ws.OpText
var rcvstr string = ""
err := wsutil.WriteServerMessage(conn, op, wmsg)
if err != nil {
// handle error
fmt.Println("Failed to write ws data", write, err)
return "", err
}
var echo = true
var got_line_feed = false
switch write {
case PROMPT_PASSWORD:
echo = false
}
for {
rmsg, op, err := wsutil.ReadClientData(conn)
if err != nil {
// handle error
fmt.Println("Failed to read ws data", err)
return "", err
} else {
if cfg.debug {
fmt.Println("Received ws data, op", op, "msg", rmsg)
}
if rmsg[0] == '\r' || rmsg[0] == '\n' {
got_line_feed = true
} else {
rcvstr += string(rmsg)
}
if echo {
err = wsutil.WriteServerMessage(conn, op, rmsg)
if err != nil {
fmt.Println("Failed to send echo data", rmsg)
}
}
if got_line_feed {
break
}
}
}
return rcvstr, nil
}
func doWsComm(resp http.ResponseWriter, req *http.Request) {
conn, _, _, err := ws.UpgradeHTTP(req, resp)
if err != nil {
// handle error
fmt.Println("Failed to upgrade to websocket,", err, req)
return
}
go func() {
defer conn.Close()
for {
msg, op, err := wsutil.ReadClientData(conn)
if err != nil {
// handle error
fmt.Println("Failed to read ws data", err)
break
} else {
if cfg.debug {
fmt.Println("Received ws data, op", op, "msg", msg)
}
}
err = wsutil.WriteServerMessage(conn, op, msg)
if err != nil {
// handle error
fmt.Println("Failed to write ws data", err)
break
}
}
}()
}