Esempio n. 1
0
File: conn.go Progetto: go-lsst/ncs
func (c *cwrapperImpl) init(msg *logger.Logger) error {
	var err error

	if spawnCwrapper {
		err = c.startCWrapper(msg)
		if err != nil {
			return err
		}
	} else {
		go func() {
			c.quit <- struct{}{}
		}()
	}

	msg.Infof("... starting tcp server ...\n")
	c.lst, err = net.Listen("tcp", fmt.Sprintf(":%d", c.port))
	if err != nil {
		msg.Errorf("error starting tcp server: %v\n", err)
		return err
	}

	msg.Infof("... waiting for a connection ...\n")
	c.conn, err = c.lst.Accept()
	if err != nil {
		msg.Errorf("error accepting connection: %v\n", err)
		return err
	}

	return err
}
Esempio n. 2
0
File: conn.go Progetto: go-lsst/ncs
func (c *cwrapperImpl) startCWrapper(msg *logger.Logger) error {
	host, err := c.host(msg)
	if err != nil {
		return err
	}

	msg.Infof("Starting c-wrapper on PC-104... (listen for %s:%d)\n", host, c.port)

	cmd := exec.Command(
		"ssh",
		"-X",
		"*****@*****.**",
		"/root/bin/startCWrapper --host="+host, fmt.Sprintf("--port=%d", c.port),
	)
	cmd.Env = os.Environ()
	cmd.Env = append(cmd.Env, "TERM=vt100")
	//cmd.Stdin = os.Stdin
	//cmd.Stdout = os.Stderr
	//cmd.Stderr = os.Stderr
	cmd.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}

	msg.Infof("c-wrapper command: %v\n", cmd.Args)

	c.proc = cmd
	err = c.proc.Start()
	if err != nil {
		msg.Errorf("error starting c-wrapper: %v\n", err)
		return err
	}

	go func() {
		select {
		case <-c.quit:
			c.errc <- c.proc.Process.Kill()
		}
	}()

	return err
}
Esempio n. 3
0
File: conn.go Progetto: go-lsst/ncs
func (c *cwrapperImpl) host(msg *logger.Logger) (string, error) {
	host, err := os.Hostname()
	if err != nil {
		msg.Errorf("could not retrieve hostname: %v\n", err)
		return "", err
	}

	addrs, err := net.LookupIP(host)
	if err != nil {
		msg.Errorf("could not lookup hostname IP: %v\n", err)
		return "", err
	}

	for _, addr := range addrs {
		ipv4 := addr.To4()
		if ipv4 == nil {
			continue
		}
		return ipv4.String(), nil
	}

	msg.Errorf("could not infer host IP")
	return "", fmt.Errorf("could not infer host IP")
}