from __future__ import print_function '''PipeTransport implements fake wire transport over local named pipe. Use this transport for talking with trezor simulator.''' import os from select import select from .transport import Transport class PipeTransport(Transport): def __init__(self, device, is_device, *args, **kwargs): self.is_device = is_device # Set True if act as device super(PipeTransport, self).__init__(device, *args, **kwargs) def _open(self): if self.is_device: self.filename_read = self.device+'.to' self.filename_write = self.device+'.from' os.mkfifo(self.filename_read, 0o600) os.mkfifo(self.filename_write, 0o600) else: self.filename_read = self.device+'.from' self.filename_write = self.device+'.to' if not os.path.exists(self.filename_write): raise Exception("Not connected") self.write_fd = os.open(self.filename_write, os.O_RDWR)#|os.O_NONBLOCK) self.write_f = os.fdopen(self.write_fd, 'w+b', 0) self.read_fd = os.open(self.filename_read, os.O_RDWR)#|os.O_NONBLOCK) self.read_f = os.fdopen(self.read_fd, 'rb', 0) def _close(self): self.read_f.close() self.write_f.close() if self.is_device: os.unlink(self.filename_read) os.unlink(self.filename_write) def ready_to_read(self): rlist, _, _ = select([self.read_f], [], [], 0) return len(rlist) > 0 def _write(self, msg, protobuf_msg): try: self.write_f.write(msg) self.write_f.flush() except OSError: print("Error while writing to socket") raise def _read(self): try: (msg_type, datalen) = self._read_headers(self.read_f) return (msg_type, self.read_f.read(datalen)) except IOError: print("Failed to read from device") raise