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52 lines
1.4 KiB
Python
52 lines
1.4 KiB
Python
'''UDP Socket implementation of Transport.'''
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import socket
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from select import select
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from .transport import TransportV2, ConnectionError
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class UdpTransport(TransportV2):
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def __init__(self, device, *args, **kwargs):
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device = device.split(':')
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if len(device) < 2:
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if not device[0]:
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# Default port used by trezor v2
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device = ('127.0.0.1', 21324)
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else:
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device = ('127.0.0.1', int(device[0]))
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else:
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device = (device[0], int(device[1]))
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self.socket = None
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super(UdpTransport, self).__init__(device, *args, **kwargs)
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def _open(self):
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self.socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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self.socket.connect(self.device)
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self.socket.settimeout(10)
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def _close(self):
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self.socket.close()
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self.socket = None
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def _ready_to_read(self):
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rlist, _, _ = select([self.socket], [], [], 0)
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return len(rlist) > 0
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def _write_chunk(self, chunk):
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if len(chunk) != 64:
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raise Exception("Unexpected data length")
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self.socket.sendall(chunk)
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def _read_chunk(self):
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while True:
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try:
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data = self.socket.recv(64)
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break
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except socket.timeout:
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continue
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if len(data) != 64:
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raise Exception("Unexpected chunk size: %d" % len(data))
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return bytearray(data)
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