func handleConnToTunnel(sshClient *ssh.Client, dbUrl *url.URL, sock net.Conn, errs chan error) {
connID := <-connIDGenerator
fmt.Printf("Connect to %s [%v]\n", dbUrl.Host, connID)
conn, err := sshClient.Dial("tcp", dbUrl.Host)
if err != nil {
errs <- err
return
}
wg := &sync.WaitGroup{}
wg.Add(2)
go func() {
io.Copy(sock, conn)
sock.Close()
wg.Done()
}()
go func() {
io.Copy(conn, sock)
conn.Close()
wg.Done()
}()
wg.Wait()
fmt.Printf("End of connection [%d]\n", connID)
}
