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81 lines
2.3 KiB
Python
81 lines
2.3 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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import time
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from .transport import Transport, ConnectionError
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class FakeRead(object):
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# Let's pretend we have a file-like interface
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def __init__(self, func):
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self.func = func
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def read(self, size):
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return self.func(size)
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class UdpTransport(Transport):
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def __init__(self, device, *args, **kwargs):
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self.buffer = ''
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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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def _close(self):
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self.socket.close()
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self.socket = None
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self.buffer = ''
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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 _write(self, msg, protobuf_msg):
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raise NotImplemented()
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def _read(self):
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(session_id, msg_type, datalen) = self._read_headers(FakeRead(self._raw_read))
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return (session_id, msg_type, self._raw_read(datalen))
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def _raw_read(self, length):
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start = time.time()
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while len(self.buffer) < length:
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data = self.socket.recv(64)
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if not len(data):
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if time.time() - start > 10:
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# Over 10 s of no response, let's check if
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# device is still alive
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if not self.is_connected():
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raise ConnectionError("Connection failed")
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else:
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# Restart timer
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start = time.time()
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time.sleep(0.001)
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continue
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self.buffer += data
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ret = self.buffer[:length]
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self.buffer = self.buffer[length:]
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return ret
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