class TestRange(unittest.TestCase):
def setUp(self):
self.c = Range(3, 7, UBInt8("foo"))
def test_trivial(self):
pass
def test_parse(self):
self.assertEqual(self.c.parse(six.b("\x01\x02\x03")), [1, 2, 3])
self.assertEqual(self.c.parse(six.b("\x01\x02\x03\x04\x05\x06")),
[1, 2, 3, 4, 5, 6])
self.assertEqual(self.c.parse(six.b("\x01\x02\x03\x04\x05\x06\x07")),
[1, 2, 3, 4, 5, 6, 7])
self.assertEqual(self.c.parse(six.b("\x01\x02\x03\x04\x05\x06\x07\x08\x09")),
[1, 2, 3, 4, 5, 6, 7])
def test_build(self):
self.assertEqual(self.c.build([1, 2, 3, 4]), six.b("\x01\x02\x03\x04"))
def test_build_undersized(self):
self.assertRaises(RangeError, self.c.build, [1, 2])
def test_build_oversized(self):
self.assertRaises(RangeError, self.c.build, [1, 2, 3, 4, 5, 6, 7, 8])
class TestRange(unittest.TestCase):
def setUp(self):
self.c = Range(3, 7, UBInt8("foo"))
def test_trivial(self):
pass
def test_parse(self):
self.assertEqual(self.c.parse(b"\x01\x02\x03"), [1, 2, 3])
self.assertEqual(self.c.parse(b"\x01\x02\x03\x04\x05\x06"),
[1, 2, 3, 4, 5, 6])
self.assertEqual(self.c.parse(b"\x01\x02\x03\x04\x05\x06\x07"),
[1, 2, 3, 4, 5, 6, 7])
self.assertEqual(self.c.parse(b"\x01\x02\x03\x04\x05\x06\x07\x08\x09"),
[1, 2, 3, 4, 5, 6, 7])
def test_build(self):
self.assertEqual(self.c.build([1, 2, 3, 4]), b"\x01\x02\x03\x04")
def test_build_undersized(self):
self.assertRaises(RangeError, self.c.build, [1, 2])
def test_build_oversized(self):
self.assertRaises(RangeError, self.c.build, [1, 2, 3, 4, 5, 6, 7, 8])
class TestRange(unittest.TestCase):
def setUp(self):
self.c = Range(3, 7, UBInt8("foo"))
self.nested_range = Range(0, 100, Struct('report', UBInt8('id')))
def test_trivial(self):
pass
def test_parse(self):
self.assertEqual(self.c.parse(b"\x01\x02\x03"), [1, 2, 3])
self.assertEqual(self.c.parse(b"\x01\x02\x03\x04\x05\x06"),
[1, 2, 3, 4, 5, 6])
self.assertEqual(self.c.parse(b"\x01\x02\x03\x04\x05\x06\x07"),
[1, 2, 3, 4, 5, 6, 7])
self.assertEqual(self.nested_range.parse(b'\x01\x02'),
[Container(id=1), Container(id=2)])
def test_build(self):
self.assertEqual(self.c.build([1, 2, 3, 4]), b"\x01\x02\x03\x04")
self.assertEqual(
self.nested_range.build([dict(id=i) for i in range(5)]),
b'\x00\x01\x02\x03\x04')
def test_parse_undersized(self):
self.assertRaises(RangeError, self.c.parse, b'\x00')
def test_build_undersized(self):
self.assertRaises(RangeError, self.c.build, [1, 2])
def test_parse_oversized(self):
self.assertEqual(self.c.parse(b"\x01\x02\x03\x04\x05\x06\x07\x08\x09"),
[1, 2, 3, 4, 5, 6, 7])
def test_build_oversized(self):
self.assertRaises(RangeError, self.c.build, [1, 2, 3, 4, 5, 6, 7, 8])
def test_build_invalid_build_input(self):
self.assertRaises(RangeError, self.c.build, 0)
self.assertRaises(RangeError, self.nested_range.build, {'id': 1})
def test_unsane_constructor_min_max(self):
self.assertRaises(RangeError, Range, -2, 7, UBInt8("byte"))
self.assertRaises(RangeError, Range, -2, -7, UBInt8("byte"))
self.assertRaises(RangeError, Range, 2, -7, UBInt8("byte"))
self.assertRaises(RangeError, Range, 7, 2, UBInt8("byte"))
class USBTransport(object):
'''Implement USB transport.'''
def __init__(self, device=None):
'''Instantiate the first available PTP device over USB'''
logger.debug('Init USB')
self.__setup_constructors()
# If no device is specified, find all devices claiming to be Cameras
# and get the USB endpoints for the first one that works.
if device is None:
logger.debug('No device provided, probing all USB devices.')
if isinstance(device, six.string_types):
name = device
logger.debug(
'Device name provided, probing all USB devices for {}.'.format(
name))
device = None
else:
name = None
devs = ([device] if
(device is not None) else find_usb_cameras(name=name))
self.__acquire_camera(devs)
self.__event_queue = Queue()
self.__event_shutdown = Event()
# Locks for different end points.
self.__inep_lock = RLock()
self.__intep_lock = RLock()
self.__outep_lock = RLock()
self.__event_proc = Thread(name='EvtPolling',
target=self.__poll_events)
self.__event_proc.daemon = False
atexit.register(self._shutdown)
self.__event_proc.start()
def __available_cameras(self, devs):
for dev in devs:
if self.__setup_device(dev):
logger.debug('Found USB PTP device {}'.format(dev))
yield
else:
message = 'No USB PTP device found.'
logger.error(message)
raise PTPError(message)
def __acquire_camera(self, devs):
'''From the cameras given, get the first one that does not fail'''
for _ in self.__available_cameras(devs):
try:
if self.__dev.is_kernel_driver_active(
self.__intf.bInterfaceNumber):
try:
self.__dev.detach_kernel_driver(
self.__intf.bInterfaceNumber)
usb.util.claim_interface(self.__dev, self.__intf)
except usb.core.USBError:
message = ('Could not detach kernel driver. '
'Maybe the camera is mounted?')
logger.error(message)
logger.debug('Claiming {}'.format(repr(self.__dev)))
usb.util.claim_interface(self.__dev, self.__intf)
except Exception as e:
logger.debug('{}'.format(e))
continue
break
else:
message = ('Could acquire any camera.')
logger.error(message)
raise PTPError(message)
def _shutdown(self):
logger.debug('Shutdown request')
self.__event_shutdown.set()
# Free USB resource on shutdown.
# Only join a running thread.
if self.__event_proc.is_alive():
self.__event_proc.join(2)
logger.debug('Release {}'.format(repr(self.__dev)))
usb.util.release_interface(self.__dev, self.__intf)
# Helper methods.
# ---------------------
def __setup_device(self, dev):
'''Get endpoints for a device. True on success.'''
self.__inep = None
self.__outep = None
self.__intep = None
self.__cfg = None
self.__dev = None
self.__intf = None
# Attempt to find the USB in, out and interrupt endpoints for a PTP
# interface.
for cfg in dev:
for intf in cfg:
if intf.bInterfaceClass == PTP_USB_CLASS:
for ep in intf:
ep_type = endpoint_type(ep.bmAttributes)
ep_dir = endpoint_direction(ep.bEndpointAddress)
if ep_type == ENDPOINT_TYPE_BULK:
if ep_dir == ENDPOINT_IN:
self.__inep = ep
elif ep_dir == ENDPOINT_OUT:
self.__outep = ep
elif ((ep_type == ENDPOINT_TYPE_INTR)
and (ep_dir == ENDPOINT_IN)):
self.__intep = ep
if not (self.__inep and self.__outep and self.__intep):
self.__inep = None
self.__outep = None
self.__intep = None
else:
logger.debug('Found {}'.format(repr(self.__inep)))
logger.debug('Found {}'.format(repr(self.__outep)))
logger.debug('Found {}'.format(repr(self.__intep)))
self.__cfg = cfg
self.__dev = dev
self.__intf = intf
return True
return False
def __setup_constructors(self):
'''Set endianness and create transport-specific constructors.'''
# Set endianness of constructors before using them.
self._set_endian('little')
self.__Length = Int32ul
self.__Type = Enum(
Int16ul,
default=Pass,
Undefined=0x0000,
Command=0x0001,
Data=0x0002,
Response=0x0003,
Event=0x0004,
)
# This is just a convenience constructor to get the size of a header.
self.__Code = Int16ul
self.__Header = Struct(
'Length' / self.__Length,
'Type' / self.__Type,
'Code' / self.__Code,
'TransactionID' / self._TransactionID,
)
# These are the actual constructors for parsing and building.
self.__CommandHeader = Struct(
'Length' / self.__Length,
'Type' / self.__Type,
'OperationCode' / self._OperationCode,
'TransactionID' / self._TransactionID,
)
self.__ResponseHeader = Struct(
'Length' / self.__Length,
'Type' / self.__Type,
'ResponseCode' / self._ResponseCode,
'TransactionID' / self._TransactionID,
)
self.__EventHeader = Struct(
'Length' / self.__Length,
'Type' / self.__Type,
'EventCode' / self._EventCode,
'TransactionID' / self._TransactionID,
)
# Apparently nobody uses the SessionID field. Even though it is
# specified in ISO15740:2013(E), no device respects it and the session
# number is implicit over USB.
self.__Param = Range(0, 5, self._Parameter)
self.__CommandTransactionBase = Struct(
Embedded(self.__CommandHeader), 'Payload' /
Bytes(lambda ctx, h=self.__Header: ctx.Length - h.sizeof()))
self.__CommandTransaction = ExprAdapter(
self.__CommandTransactionBase,
encoder=lambda obj, ctx, h=self.__Header: Container(
Length=len(obj.Payload) + h.sizeof(), **obj),
decoder=lambda obj, ctx: obj,
)
self.__ResponseTransactionBase = Struct(
Embedded(self.__ResponseHeader), 'Payload' /
Bytes(lambda ctx, h=self.__Header: ctx.Length - h.sizeof()))
self.__ResponseTransaction = ExprAdapter(
self.__ResponseTransactionBase,
encoder=lambda obj, ctx, h=self.__Header: Container(
Length=len(obj.Payload) + h.sizeof(), **obj),
decoder=lambda obj, ctx: obj,
)
def __parse_response(self, usbdata):
'''Helper method for parsing USB data.'''
# Build up container with all PTP info.
usbdata = bytearray(usbdata)
transaction = self.__ResponseTransaction.parse(usbdata)
response = Container(
SessionID=self.session_id,
TransactionID=transaction.TransactionID,
)
if transaction.Type == 'Response':
response['ResponseCode'] = transaction.ResponseCode
response['Parameter'] = self.__Param.parse(transaction.Payload)
elif transaction.Type == 'Event':
event = self.__EventHeader.parse(usbdata[0:self.__Header.sizeof()])
response['EventCode'] = event.EventCode
response['Parameter'] = self.__Param.parse(transaction.Payload)
else:
command = self.__CommandHeader.parse(
usbdata[0:self.__Header.sizeof()])
response['OperationCode'] = command.OperationCode
response['Data'] = transaction.Payload
return response
def __recv(self, event=False, wait=False, raw=False):
'''Helper method for receiving data.'''
# TODO: clear stalls automatically
ep = self.__intep if event else self.__inep
lock = self.__intep_lock if event else self.__inep_lock
with lock:
try:
usbdata = ep.read(ep.wMaxPacketSize, timeout=0 if wait else 5)
except usb.core.USBError as e:
# Ignore timeout or busy device once.
if e.errno == 110 or e.errno == 16:
if event:
return None
else:
usbdata = ep.read(ep.wMaxPacketSize, timeout=5000)
else:
raise e
header = self.__ResponseHeader.parse(
bytearray(usbdata[0:self.__Header.sizeof()]))
if header.Type not in ['Response', 'Data', 'Event']:
raise PTPError(
'Unexpected USB transfer type.'
'Expected Response, Event or Data but received {}'.format(
header.Type))
while len(usbdata) < header.Length:
usbdata += ep.read(ep.wMaxPacketSize, timeout=5000)
if raw:
return usbdata
else:
return self.__parse_response(usbdata)
def __send(self, ptp_container, event=False):
'''Helper method for sending data.'''
ep = self.__intep if event else self.__outep
lock = self.__intep_lock if event else self.__outep_lock
transaction = self.__CommandTransaction.build(ptp_container)
with lock:
try:
ep.write(transaction, timeout=1)
except usb.core.USBError as e:
# Ignore timeout or busy device once.
if e.errno == 110 or e.errno == 16:
ep.write(transaction, timeout=5000)
def __send_request(self, ptp_container):
'''Send PTP request without checking answer.'''
# Don't modify original container to keep abstraction barrier.
ptp = Container(**ptp_container)
# Don't send unused parameters
try:
while not ptp.Parameter[-1]:
ptp.Parameter.pop()
if len(ptp.Parameter) == 0:
break
except IndexError:
# The Parameter list is already empty.
pass
# Send request
ptp['Type'] = 'Command'
ptp['Payload'] = self.__Param.build(ptp.Parameter)
self.__send(ptp)
def __send_data(self, ptp_container, data):
'''Send data without checking answer.'''
# Don't modify original container to keep abstraction barrier.
ptp = Container(**ptp_container)
# Send data
ptp['Type'] = 'Data'
ptp['Payload'] = data
self.__send(ptp)
# Actual implementation
# ---------------------
def send(self, ptp_container, data):
'''Transfer operation with dataphase from initiator to responder'''
datalen = len(data)
logger.debug('SEND {} {} bytes{}'.format(
ptp_container.OperationCode,
datalen,
' ' + str(list(map(hex, ptp_container.Parameter)))
if ptp_container.Parameter else '',
))
self.__send_request(ptp_container)
self.__send_data(ptp_container, data)
# Get response and sneak in implicit SessionID and missing parameters.
response = self.__recv()
logger.debug('SEND {} {} bytes {}{}'.format(
ptp_container.OperationCode,
datalen,
response.ResponseCode,
' ' + str(list(map(hex, response.Parameter)))
if ptp_container.Parameter else '',
))
return response
def recv(self, ptp_container):
'''Transfer operation with dataphase from responder to initiator.'''
logger.debug('RECV {}{}'.format(
ptp_container.OperationCode,
' ' + str(list(map(hex, ptp_container.Parameter)))
if ptp_container.Parameter else '',
))
self.__send_request(ptp_container)
dataphase = self.__recv()
if hasattr(dataphase, 'Data'):
response = self.__recv()
if ((ptp_container.OperationCode != dataphase.OperationCode)
or (ptp_container.TransactionID != dataphase.TransactionID)
or (ptp_container.SessionID != dataphase.SessionID)
or (dataphase.TransactionID != response.TransactionID)
or (dataphase.SessionID != response.SessionID)):
raise PTPError(
'Dataphase does not match with requested operation.')
response['Data'] = dataphase.Data
else:
response = dataphase
logger.debug('RECV {} {}{}{}'.format(
ptp_container.OperationCode,
response.ResponseCode,
' {} bytes'.format(len(response.Data)) if hasattr(
response, 'Data') else '',
' ' + str(list(map(hex, response.Parameter)))
if response.Parameter else '',
))
return response
def mesg(self, ptp_container):
'''Transfer operation without dataphase.'''
logger.debug('MESG {}{}'.format(
ptp_container.OperationCode,
' ' + str(list(map(hex, ptp_container.Parameter)))
if ptp_container.Parameter else '',
))
self.__send_request(ptp_container)
# Get response and sneak in implicit SessionID and missing parameters
# for FullResponse.
response = self.__recv()
logger.debug('MESG {} {}{}'.format(
ptp_container.OperationCode,
response.ResponseCode,
' ' + str(list(map(hex, response.Parameter)))
if response.Parameter else '',
))
return response
def event(self, wait=False):
'''Check event.
If `wait` this function is blocking. Otherwise it may return None.
'''
evt = None
usbdata = None
timeout = None if wait else 0.001
if not self.__event_queue.empty():
usbdata = self.__event_queue.get(block=not wait, timeout=timeout)
if usbdata is not None:
evt = self.__parse_response(usbdata)
return evt
def __poll_events(self):
'''Poll events, adding them to a queue.'''
while not self.__event_shutdown.is_set() and _main_thread_alive():
evt = self.__recv(event=True, wait=False, raw=True)
if evt is not None:
logger.debug('Event queued')
self.__event_queue.put(evt)
class USBTransport(object):
'''Implement USB transport.'''
def __init__(self, *args, **kwargs):
device = kwargs.get('device', None)
'''Instantiate the first available PTP device over USB'''
logger.debug('Init USB')
self.__setup_constructors()
# If no device is specified, find all devices claiming to be Cameras
# and get the USB endpoints for the first one that works.
if device is None:
logger.debug('No device provided, probing all USB devices.')
if isinstance(device, six.string_types):
name = device
logger.debug(
'Device name provided, probing all USB devices for {}.'
.format(name)
)
device = None
else:
name = None
devs = (
[device] if (device is not None)
else find_usb_cameras(name=name)
)
self.__claimed = False
self.__acquire_camera(devs)
self.__event_queue = Queue()
self.__event_shutdown = Event()
# Locks for different end points.
self.__inep_lock = RLock()
self.__intep_lock = RLock()
self.__outep_lock = RLock()
# Slightly redundant transaction lock to avoid catching other request's
# response
self.__transaction_lock = RLock()
self.__event_proc = Thread(
name='EvtPolling',
target=self.__poll_events
)
self.__event_proc.daemon = False
atexit.register(self._shutdown)
self.__event_proc.start()
def __available_cameras(self, devs):
for dev in devs:
if self.__setup_device(dev):
logger.debug('Found USB PTP device {}'.format(dev))
yield
else:
message = 'No USB PTP device found.'
logger.error(message)
raise PTPError(message)
def __acquire_camera(self, devs):
'''From the cameras given, get the first one that does not fail'''
for _ in self.__available_cameras(devs):
# Stop system drivers
try:
if self.__dev.is_kernel_driver_active(
self.__intf.bInterfaceNumber):
try:
self.__dev.detach_kernel_driver(
self.__intf.bInterfaceNumber)
except usb.core.USBError:
message = (
'Could not detach kernel driver. '
'Maybe the camera is mounted?'
)
logger.error(message)
except NotImplementedError as e:
logger.debug('Ignoring unimplemented function: {}'.format(e))
# Claim camera
try:
logger.debug('Claiming {}'.format(repr(self.__dev)))
usb.util.claim_interface(self.__dev, self.__intf)
self.__claimed = True
except Exception as e:
logger.warn('Failed to claim PTP device: {}'.format(e))
continue
self.__dev.reset()
break
else:
message = (
'Could not acquire any camera.'
)
logger.error(message)
raise PTPError(message)
def _shutdown(self):
logger.debug('Shutdown request')
self.__event_shutdown.set()
# Free USB resource on shutdown.
# Only join a running thread.
if self.__event_proc.is_alive():
self.__event_proc.join(2)
try:
if self.__claimed:
logger.debug('Release {}'.format(repr(self.__dev)))
usb.util.release_interface(self.__dev, self.__intf)
except Exception as e:
logger.warn(e)
# Helper methods.
# ---------------------
def __setup_device(self, dev):
'''Get endpoints for a device. True on success.'''
self.__inep = None
self.__outep = None
self.__intep = None
self.__cfg = None
self.__dev = None
self.__intf = None
# Attempt to find the USB in, out and interrupt endpoints for a PTP
# interface.
for cfg in dev:
for intf in cfg:
if intf.bInterfaceClass == PTP_USB_CLASS:
for ep in intf:
ep_type = endpoint_type(ep.bmAttributes)
ep_dir = endpoint_direction(ep.bEndpointAddress)
if ep_type == ENDPOINT_TYPE_BULK:
if ep_dir == ENDPOINT_IN:
self.__inep = ep
elif ep_dir == ENDPOINT_OUT:
self.__outep = ep
elif ((ep_type == ENDPOINT_TYPE_INTR) and
(ep_dir == ENDPOINT_IN)):
self.__intep = ep
if not (self.__inep and self.__outep and self.__intep):
self.__inep = None
self.__outep = None
self.__intep = None
else:
logger.debug('Found {}'.format(repr(self.__inep)))
logger.debug('Found {}'.format(repr(self.__outep)))
logger.debug('Found {}'.format(repr(self.__intep)))
self.__cfg = cfg
self.__dev = dev
self.__intf = intf
return True
return False
def __setup_constructors(self):
'''Set endianness and create transport-specific constructors.'''
# Set endianness of constructors before using them.
self._set_endian('little')
self.__Length = Int32ul
self.__Type = Enum(
Int16ul,
default=Pass,
Undefined=0x0000,
Command=0x0001,
Data=0x0002,
Response=0x0003,
Event=0x0004,
)
# This is just a convenience constructor to get the size of a header.
self.__Code = Int16ul
self.__Header = Struct(
'Length' / self.__Length,
'Type' / self.__Type,
'Code' / self.__Code,
'TransactionID' / self._TransactionID,
)
# These are the actual constructors for parsing and building.
self.__CommandHeader = Struct(
'Length' / self.__Length,
'Type' / self.__Type,
'OperationCode' / self._OperationCode,
'TransactionID' / self._TransactionID,
)
self.__ResponseHeader = Struct(
'Length' / self.__Length,
'Type' / self.__Type,
'ResponseCode' / self._ResponseCode,
'TransactionID' / self._TransactionID,
)
self.__EventHeader = Struct(
'Length' / self.__Length,
'Type' / self.__Type,
'EventCode' / self._EventCode,
'TransactionID' / self._TransactionID,
)
# Apparently nobody uses the SessionID field. Even though it is
# specified in ISO15740:2013(E), no device respects it and the session
# number is implicit over USB.
self.__Param = Range(0, 5, self._Parameter)
self.__CommandTransactionBase = Struct(
Embedded(self.__CommandHeader),
'Payload' / Bytes(
lambda ctx, h=self.__Header: ctx.Length - h.sizeof()
)
)
self.__CommandTransaction = ExprAdapter(
self.__CommandTransactionBase,
encoder=lambda obj, ctx, h=self.__Header: Container(
Length=len(obj.Payload) + h.sizeof(),
**obj
),
decoder=lambda obj, ctx: obj,
)
self.__ResponseTransactionBase = Struct(
Embedded(self.__ResponseHeader),
'Payload' / Bytes(
lambda ctx, h=self.__Header: ctx.Length - h.sizeof())
)
self.__ResponseTransaction = ExprAdapter(
self.__ResponseTransactionBase,
encoder=lambda obj, ctx, h=self.__Header: Container(
Length=len(obj.Payload) + h.sizeof(),
**obj
),
decoder=lambda obj, ctx: obj,
)
def __parse_response(self, usbdata):
'''Helper method for parsing USB data.'''
# Build up container with all PTP info.
logger.debug('Transaction:')
usbdata = bytearray(usbdata)
if logger.isEnabledFor(logging.DEBUG):
for l in hexdump(
six.binary_type(usbdata[:512]),
result='generator'
):
logger.debug(l)
transaction = self.__ResponseTransaction.parse(usbdata)
response = Container(
SessionID=self.session_id,
TransactionID=transaction.TransactionID,
)
logger.debug('Interpreting {} transaction'.format(transaction.Type))
if transaction.Type == 'Response':
response['ResponseCode'] = transaction.ResponseCode
response['Parameter'] = self.__Param.parse(transaction.Payload)
elif transaction.Type == 'Event':
event = self.__EventHeader.parse(
usbdata[0:self.__Header.sizeof()]
)
response['EventCode'] = event.EventCode
response['Parameter'] = self.__Param.parse(transaction.Payload)
else:
command = self.__CommandHeader.parse(
usbdata[0:self.__Header.sizeof()]
)
response['OperationCode'] = command.OperationCode
response['Data'] = transaction.Payload
return response
def __recv(self, event=False, wait=False, raw=False):
'''Helper method for receiving data.'''
# TODO: clear stalls automatically
ep = self.__intep if event else self.__inep
lock = self.__intep_lock if event else self.__inep_lock
usbdata = array.array('B', [])
with lock:
tries = 0
# Attempt to read a header
while len(usbdata) < self.__Header.sizeof() and tries < 5:
if tries > 0:
logger.debug('Data smaller than a header')
logger.debug(
'Requesting {} bytes of data'
.format(ep.wMaxPacketSize)
)
try:
usbdata += ep.read(
ep.wMaxPacketSize
)
except usb.core.USBError as e:
# Return None on timeout or busy for events
if (
(e.errno is None and
('timeout' in e.strerror.decode() or
'busy' in e.strerror.decode())) or
(e.errno == 110 or e.errno == 16 or e.errno == 5)
):
if event:
return None
else:
logger.warning('Ignored exception: {}'.format(e))
else:
logger.error(e)
raise e
tries += 1
logger.debug('Read {} bytes of data'.format(len(usbdata)))
if len(usbdata) == 0:
if event:
return None
else:
raise PTPError('Empty USB read')
if (
logger.isEnabledFor(logging.DEBUG) and
len(usbdata) < self.__Header.sizeof()
):
logger.debug('Incomplete header')
for l in hexdump(
six.binary_type(bytearray(usbdata)),
result='generator'
):
logger.debug(l)
header = self.__ResponseHeader.parse(
bytearray(usbdata[0:self.__Header.sizeof()])
)
if header.Type not in ['Response', 'Data', 'Event']:
raise PTPError(
'Unexpected USB transfer type. '
'Expected Response, Event or Data but received {}'
.format(header.Type)
)
while len(usbdata) < header.Length:
usbdata += ep.read(
min(
header.Length - len(usbdata),
# Up to 64kB
64 * 2**10
)
)
if raw:
return usbdata
else:
return self.__parse_response(usbdata)
def __send(self, ptp_container, event=False):
'''Helper method for sending data.'''
ep = self.__intep if event else self.__outep
lock = self.__intep_lock if event else self.__outep_lock
transaction = self.__CommandTransaction.build(ptp_container)
with lock:
try:
sent = 0
while sent < len(transaction):
sent = ep.write(
# Up to 64kB
transaction[sent:(sent + 64*2**10)]
)
except usb.core.USBError as e:
# Ignore timeout or busy device once.
if (
(e.errno is None and
('timeout' in e.strerror.decode() or
'busy' in e.strerror.decode())) or
(e.errno == 110 or e.errno == 16 or e.errno == 5)
):
logger.warning('Ignored USBError {}'.format(e.errno))
ep.write(transaction)
def __send_request(self, ptp_container):
'''Send PTP request without checking answer.'''
# Don't modify original container to keep abstraction barrier.
ptp = Container(**ptp_container)
# Don't send unused parameters
try:
while not ptp.Parameter[-1]:
ptp.Parameter.pop()
if len(ptp.Parameter) == 0:
break
except IndexError:
# The Parameter list is already empty.
pass
# Send request
ptp['Type'] = 'Command'
ptp['Payload'] = self.__Param.build(ptp.Parameter)
self.__send(ptp)
def __send_data(self, ptp_container, data):
'''Send data without checking answer.'''
# Don't modify original container to keep abstraction barrier.
ptp = Container(**ptp_container)
# Send data
ptp['Type'] = 'Data'
ptp['Payload'] = data
self.__send(ptp)
@property
def _dev(self):
return None if self.__event_shutdown.is_set() else self.__dev
@_dev.setter
def _dev(self, value):
raise ValueError('Read-only property')
# Actual implementation
# ---------------------
def send(self, ptp_container, data):
'''Transfer operation with dataphase from initiator to responder'''
datalen = len(data)
logger.debug('SEND {} {} bytes{}'.format(
ptp_container.OperationCode,
datalen,
' ' + str(list(map(hex, ptp_container.Parameter)))
if ptp_container.Parameter else '',
))
with self.__transaction_lock:
self.__send_request(ptp_container)
self.__send_data(ptp_container, data)
# Get response and sneak in implicit SessionID and missing
# parameters.
response = self.__recv()
logger.debug('SEND {} {} bytes {}{}'.format(
ptp_container.OperationCode,
datalen,
response.ResponseCode,
' ' + str(list(map(hex, response.Parameter)))
if ptp_container.Parameter else '',
))
return response
def recv(self, ptp_container):
'''Transfer operation with dataphase from responder to initiator.'''
logger.debug('RECV {}{}'.format(
ptp_container.OperationCode,
' ' + str(list(map(hex, ptp_container.Parameter)))
if ptp_container.Parameter else '',
))
with self.__transaction_lock:
self.__send_request(ptp_container)
dataphase = self.__recv()
if hasattr(dataphase, 'Data'):
response = self.__recv()
if not (ptp_container.SessionID ==
dataphase.SessionID ==
response.SessionID):
self.__dev.reset()
raise PTPError(
'Dataphase session ID missmatch: {}, {}, {}.'
.format(
ptp_container.SessionID,
dataphase.SessionID,
response.SessionID
)
)
if not (ptp_container.TransactionID ==
dataphase.TransactionID ==
response.TransactionID):
self.__dev.reset()
raise PTPError(
'Dataphase transaction ID missmatch: {}, {}, {}.'
.format(
ptp_container.TransactionID,
dataphase.TransactionID,
response.TransactionID
)
)
if not (ptp_container.OperationCode ==
dataphase.OperationCode):
self.__dev.reset()
raise PTPError(
'Dataphase operation code missmatch: {}, {}.'.
format(
ptp_container.OperationCode,
dataphase.OperationCode
)
)
response['Data'] = dataphase.Data
else:
response = dataphase
logger.debug('RECV {} {}{}{}'.format(
ptp_container.OperationCode,
response.ResponseCode,
' {} bytes'.format(len(response.Data))
if hasattr(response, 'Data') else '',
' ' + str(list(map(hex, response.Parameter)))
if response.Parameter else '',
))
return response
def mesg(self, ptp_container):
'''Transfer operation without dataphase.'''
logger.debug('MESG {}{}'.format(
ptp_container.OperationCode,
' ' + str(list(map(hex, ptp_container.Parameter)))
if ptp_container.Parameter else '',
))
with self.__transaction_lock:
self.__send_request(ptp_container)
# Get response and sneak in implicit SessionID and missing
# parameters for FullResponse.
response = self.__recv()
logger.debug('MESG {} {}{}'.format(
ptp_container.OperationCode,
response.ResponseCode,
' ' + str(list(map(hex, response.Parameter)))
if response.Parameter else '',
))
return response
def event(self, wait=False):
'''Check event.
If `wait` this function is blocking. Otherwise it may return None.
'''
evt = None
usbdata = None
if wait:
usbdata = self.__event_queue.get(block=True)
elif not self.__event_queue.empty():
usbdata = self.__event_queue.get(block=False)
if usbdata is not None:
evt = self.__parse_response(usbdata)
return evt
def __poll_events(self):
'''Poll events, adding them to a queue.'''
while not self.__event_shutdown.is_set() and _main_thread_alive():
try:
evt = self.__recv(event=True, wait=False, raw=True)
if evt is not None:
logger.debug('Event queued')
self.__event_queue.put(evt)
except usb.core.USBError as e:
logger.error(
'{} polling exception: {}'.format(repr(self.__dev), e)
)
# check if disconnected
if e.errno == 19:
break
except Exception as e:
logger.error(
'{} polling exception: {}'.format(repr(self.__dev), e)
)