def get_packet(self, deadline):
try:
bufferLen = self.epr.wMaxPacketSize
timeout = max(int((deadline - time.monotonic()) * 1000), 0)
ret = self.epr.read(bufferLen, timeout)
if self._was_damaged:
self._logger.debug("Recovered from USB halt/stall condition")
self._was_damaged = False
return bytearray(ret)
except usb.core.USBError as ex:
if ex.errno == 19 or ex.errno == 32: # "no such device", "pipe error"
raise fibre.protocol.ChannelBrokenException()
elif ex.errno is None or ex.errno == 60 or ex.errno == 110: # timeout
raise TimeoutError()
else:
self._logger.debug(
"error in usbbulk_transport.py, process_packet")
self._logger.debug(traceback.format_exc())
self._logger.debug("halt condition: {}".format(ex.errno))
self._logger.debug(str(ex))
# Try resetting halt/stall condition
try:
self.deinit()
self.init()
except usb.core.USBError:
raise fibre.protocol.ChannelBrokenException()
# Retry transfer
self._was_damaged = True
raise fibre.protocol.ChannelDamagedException()
def process_packet(self, usbBuffer):
try:
ret = self.epw.write(usbBuffer, 0)
if self._was_damaged:
self._logger.debug("Recovered from USB halt/stall condition")
self._was_damaged = False
return ret
except usb.core.USBError as ex:
if ex.errno == 19 or ex.errno == 32: # "no such device", "pipe error"
raise fibre.protocol.ChannelBrokenException()
elif ex.errno is None or ex.errno == 60 or ex.errno == 110: # timeout
raise TimeoutError()
else:
self._logger.debug(
"error in usbbulk_transport.py, process_packet")
self._logger.debug(traceback.format_exc())
self._logger.debug("halt condition: {}".format(ex.errno))
self._logger.debug(str(ex))
# Try resetting halt/stall condition
try:
self.deinit()
self.init()
except usb.core.USBError:
raise fibre.protocol.ChannelBrokenException()
# Retry transfer
self._was_damaged = True
raise fibre.protocol.ChannelDamagedException()
def get_bytes_or_fail(self, n_bytes, deadline):
result = self.get_bytes(n_bytes, deadline)
if len(result) < n_bytes:
raise TimeoutError("expected {} bytes but got only {}".format(
n_bytes, len(result)))
return result