60 lines
1.9 KiB
Python
60 lines
1.9 KiB
Python
'''TransportFake implements fake wire transport over local named pipe.
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Use this transport for talking with trezor simulator.'''
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import os
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from select import select
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from transport import Transport
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class PipeTransport(Transport):
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def __init__(self, device, is_device, *args, **kwargs):
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self.is_device = is_device # Set True if act as device
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super(PipeTransport, self).__init__(device, *args, **kwargs)
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def _open(self):
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if self.is_device:
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self.filename_read = self.device+'.to'
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self.filename_write = self.device+'.from'
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os.mkfifo(self.filename_read, 0600)
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os.mkfifo(self.filename_write, 0600)
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else:
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self.filename_read = self.device+'.from'
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self.filename_write = self.device+'.to'
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if not os.path.exists(self.filename_write):
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raise Exception("Not connected")
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self.write_fd = os.open(self.filename_write, os.O_RDWR)#|os.O_NONBLOCK)
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self.write_f = os.fdopen(self.write_fd, 'w+')
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self.read_fd = os.open(self.filename_read, os.O_RDWR)#|os.O_NONBLOCK)
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self.read_f = os.fdopen(self.read_fd, 'rb')
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def _close(self):
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self.read_f.close()
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self.write_f.close()
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if self.is_device:
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os.unlink(self.filename_read)
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os.unlink(self.filename_write)
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def ready_to_read(self):
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rlist, _, _ = select([self.read_f], [], [], 0)
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return len(rlist) > 0
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def _write(self, msg):
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try:
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self.write_f.write(msg)
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self.write_f.flush()
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except OSError:
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print "Error while writing to socket"
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raise
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def _read(self):
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try:
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(msg_type, datalen) = self._read_headers(self.read_f)
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return (msg_type, self.read_f.read(datalen))
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except IOError:
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print "Failed to read from device"
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raise
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