func (t *testAttachServer) Start() error {
log.Info("opening ttyS0 pipe pair for backchannel (server)")
c, err := os.OpenFile(pathPrefix+"/ttyS0c", os.O_WRONLY|syscall.O_NOCTTY, 0777)
if err != nil {
detail := fmt.Sprintf("failed to open cpipe for backchannel: %s", err)
log.Error(detail)
return errors.New(detail)
}
s, err := os.OpenFile(pathPrefix+"/ttyS0s", os.O_RDONLY|syscall.O_NOCTTY, 0777)
if err != nil {
detail := fmt.Sprintf("failed to open spipe for backchannel: %s", err)
log.Error(detail)
return errors.New(detail)
}
log.Infof("creating raw connection from ttyS0 pipe pair (c=%d, s=%d)\n", c.Fd(), s.Fd())
var conn net.Conn
conn, err = serial.NewHalfDuplexFileConn(s, c, pathPrefix+"/ttyS0", "file")
if err != nil {
detail := fmt.Sprintf("failed to create raw connection from ttyS0 pipe pair: %s", err)
log.Error(detail)
return errors.New(detail)
}
t.conn.Lock()
defer t.conn.Unlock()
t.conn.conn = conn
return nil
}
// create client on the mock pipe
func mockBackChannel(ctx context.Context) (net.Conn, error) {
log.Info("opening ttyS0 pipe pair for backchannel (client)")
c, err := os.OpenFile(pathPrefix+"/ttyS0c", os.O_RDONLY|syscall.O_NOCTTY, 0777)
if err != nil {
detail := fmt.Sprintf("failed to open cpipe for backchannel: %s", err)
log.Error(detail)
return nil, errors.New(detail)
}
s, err := os.OpenFile(pathPrefix+"/ttyS0s", os.O_WRONLY|syscall.O_NOCTTY, 0777)
if err != nil {
detail := fmt.Sprintf("failed to open spipe for backchannel: %s", err)
log.Error(detail)
return nil, errors.New(detail)
}
log.Infof("creating raw connection from ttyS0 pipe pair (c=%d, s=%d)\n", c.Fd(), s.Fd())
conn, err := serial.NewHalfDuplexFileConn(c, s, pathPrefix+"/ttyS0", "file")
if err != nil {
detail := fmt.Sprintf("failed to create raw connection from ttyS0 pipe pair: %s", err)
log.Error(detail)
return nil, errors.New(detail)
}
// HACK: currently RawConn dosn't implement timeout so throttle the spinning
ticker := time.NewTicker(1000 * time.Millisecond)
for {
select {
case <-ticker.C:
// FIXME: need to implement timeout of purging hangs with no content
// on the pipe
// serial.PurgeIncoming(ctx, conn)
err := serial.HandshakeClient(conn, true)
if err != nil {
if err == io.EOF {
// with unix pipes the open will block until both ends are open, therefore
// EOF means the other end has been intentionally closed
return nil, err
}
log.Error(err)
} else {
return conn, nil
}
case <-ctx.Done():
conn.Close()
ticker.Stop()
return nil, ctx.Err()
}
}
}
// create client on the mock pipe and dial the given host:port
func mockNetworkToSerialConnection(host string) (*sync.WaitGroup, error) {
log.Info("opening ttyS0 pipe pair for backchannel")
c, err := os.OpenFile(pathPrefix+"/ttyS0c", os.O_RDONLY|syscall.O_NOCTTY, 0777)
if err != nil {
return nil, fmt.Errorf("failed to open cpipe for backchannel: %s", err)
}
s, err := os.OpenFile(pathPrefix+"/ttyS0s", os.O_WRONLY|syscall.O_NOCTTY, 0777)
if err != nil {
return nil, fmt.Errorf("failed to open spipe for backchannel: %s", err)
}
log.Infof("creating raw connection from ttyS0 pipe pair (c=%d, s=%d)\n", c.Fd(), s.Fd())
fconn, err := serial.NewHalfDuplexFileConn(c, s, pathPrefix+"/ttyS0", "file")
if err != nil {
return nil, fmt.Errorf("failed to create raw connection from ttyS0 pipe pair: %s", err)
}
// Dial the attach server. This is a TCP client
networkClientCon, err := net.Dial("tcp", host)
if err != nil {
return nil, err
}
log.Debugf("dialed %s", host)
wg := sync.WaitGroup{}
wg.Add(2)
go func() {
io.Copy(networkClientCon, fconn)
wg.Done()
}()
go func() {
io.Copy(fconn, networkClientCon)
wg.Done()
}()
return &wg, nil
}