def _write_frame(self, fin, opcode, data, flags=0):
if fin:
finbit = self.FIN
else:
finbit = 0
frame = struct.pack("B", finbit | opcode | flags)
l = len(data)
if self.mask_outgoing:
mask_bit = 0x80
else:
mask_bit = 0
if l < 126:
frame += struct.pack("B", l | mask_bit)
elif l <= 0xFFFF:
frame += struct.pack("!BH", 126 | mask_bit, l)
else:
frame += struct.pack("!BQ", 127 | mask_bit, l)
if self.mask_outgoing:
mask = os.urandom(4)
data = mask + _websocket_mask(mask, data)
frame += data
self._wire_bytes_out += len(frame)
try:
self.stream.write(frame)
except StreamClosedError:
self._abort()
def _write_frame(self, fin, opcode, data, flags=0):
if fin:
finbit = self.FIN
else:
finbit = 0
frame = struct.pack("B", finbit | opcode | flags)
l = len(data)
if self.mask_outgoing:
mask_bit = 0x80
else:
mask_bit = 0
if l < 126:
frame += struct.pack("B", l | mask_bit)
elif l <= 0xFFFF:
frame += struct.pack("!BH", 126 | mask_bit, l)
else:
frame += struct.pack("!BQ", 127 | mask_bit, l)
if self.mask_outgoing:
mask = os.urandom(4)
data = mask + _websocket_mask(mask, data)
frame += data
self._wire_bytes_out += len(frame)
try:
return self.stream.write(frame)
except StreamClosedError:
self._abort()
def _write_frame(self, fin, opcode, data, flags=0):
data_len = len(data)
if opcode & 0x8:
# All control frames MUST have a payload length of 125
# bytes or less and MUST NOT be fragmented.
if not fin:
raise ValueError("control frames may not be fragmented")
if data_len > 125:
raise ValueError("control frame payloads may not exceed 125 bytes")
if fin:
finbit = self.FIN
else:
finbit = 0
frame = struct.pack("B", finbit | opcode | flags)
if self.mask_outgoing:
mask_bit = 0x80
else:
mask_bit = 0
if data_len < 126:
frame += struct.pack("B", data_len | mask_bit)
elif data_len <= 0xFFFF:
frame += struct.pack("!BH", 126 | mask_bit, data_len)
else:
frame += struct.pack("!BQ", 127 | mask_bit, data_len)
if self.mask_outgoing:
mask = os.urandom(4)
data = mask + _websocket_mask(mask, data)
frame += data
self._wire_bytes_out += len(frame)
return self.stream.write(frame)
def _write_frame(self, fin, opcode, data):
if fin:
finbit = 0x80
else:
finbit = 0
frame = struct.pack("B", finbit | opcode)
l = len(data)
if self.mask_outgoing:
mask_bit = 0x80
else:
mask_bit = 0
if l < 126:
frame += struct.pack("B", l | mask_bit)
elif l <= 0xFFFF:
frame += struct.pack("!BH", 126 | mask_bit, l)
else:
frame += struct.pack("!BQ", 127 | mask_bit, l)
if self.mask_outgoing:
mask = os.urandom(4)
data = mask + _websocket_mask(mask, data)
frame += data
self.stream.write(frame)
def _write_frame(self, fin, opcode, data):
if fin:
finbit = 0x80
else:
finbit = 0
frame = struct.pack("B", finbit | opcode)
l = len(data)
if self.mask_outgoing:
mask_bit = 0x80
else:
mask_bit = 0
if l < 126:
frame += struct.pack("B", l | mask_bit)
elif l <= 0xFFFF:
frame += struct.pack("!BH", 126 | mask_bit, l)
else:
frame += struct.pack("!BQ", 127 | mask_bit, l)
if self.mask_outgoing:
mask = os.urandom(4)
data = mask + _websocket_mask(mask, data)
frame += data
self.stream.write(frame)
def _write_frame(self, fin, opcode, data, flags=0):
if fin:
finbit = self.FIN
else:
finbit = 0
frame = struct.pack("B", finbit | opcode | flags)
data_len = len(data)
if self.mask_outgoing:
mask_bit = 0x80
else:
mask_bit = 0
if data_len < 126:
frame += struct.pack("B", data_len | mask_bit)
elif data_len <= 0xFFFF:
frame += struct.pack("!BH", 126 | mask_bit, data_len)
else:
frame += struct.pack("!BQ", 127 | mask_bit, data_len)
if self.mask_outgoing:
mask = os.urandom(4)
data = mask + _websocket_mask(mask, data)
frame += data
self._wire_bytes_out += len(frame)
return self.stream.write(frame)
def _write_frame(self, fin, opcode, data, flags=0):
if fin:
finbit = self.FIN
else:
finbit = 0
frame = struct.pack("B", finbit | opcode | flags)
data_len = len(data)
if self.mask_outgoing:
mask_bit = 0x80
else:
mask_bit = 0
if data_len < 126:
frame += struct.pack("B", data_len | mask_bit)
elif data_len <= 0xFFFF:
frame += struct.pack("!BH", 126 | mask_bit, data_len)
else:
frame += struct.pack("!BQ", 127 | mask_bit, data_len)
if self.mask_outgoing:
mask = os.urandom(4)
data = mask + _websocket_mask(mask, data)
frame += data
self._wire_bytes_out += len(frame)
return self.stream.write(frame)
def _on_masked_frame_data(self, data):
self._on_frame_data(_websocket_mask(self._frame_mask, data))
def _on_masked_frame_data(self, data):
# Don't touch _wire_bytes_in; we'll do it in _on_frame_data.
self._on_frame_data(_websocket_mask(self._frame_mask, data))
def _on_masked_frame_data(self, data):
# Don't touch _wire_bytes_in; we'll do it in _on_frame_data.
self._on_frame_data(_websocket_mask(self._frame_mask, data))
def _on_masked_frame_data(self, data):
self._on_frame_data(_websocket_mask(self._frame_mask, data))
def _receive_frame(self):
# Read the frame header.
data = yield self._read_bytes(2)
header, mask_payloadlen = struct.unpack("BB", data)
is_final_frame = header & self.FIN
reserved_bits = header & self.RSV_MASK
opcode = header & self.OPCODE_MASK
opcode_is_control = opcode & 0x8
if self._decompressor is not None and opcode != 0:
# Compression flag is present in the first frame's header,
# but we can't decompress until we have all the frames of
# the message.
self._frame_compressed = bool(reserved_bits & self.RSV1)
reserved_bits &= ~self.RSV1
if reserved_bits:
# client is using as-yet-undefined extensions; abort
self._abort()
return
is_masked = bool(mask_payloadlen & 0x80)
payloadlen = mask_payloadlen & 0x7f
# Parse and validate the length.
if opcode_is_control and payloadlen >= 126:
# control frames must have payload < 126
self._abort()
return
if payloadlen < 126:
self._frame_length = payloadlen
elif payloadlen == 126:
data = yield self._read_bytes(2)
payloadlen = struct.unpack("!H", data)[0]
elif payloadlen == 127:
data = yield self._read_bytes(8)
payloadlen = struct.unpack("!Q", data)[0]
new_len = payloadlen
if self._fragmented_message_buffer is not None:
new_len += len(self._fragmented_message_buffer)
if new_len > (self.handler.max_message_size or 10 * 1024 * 1024):
self.close(1009, "message too big")
self._abort()
return
# Read the payload, unmasking if necessary.
if is_masked:
self._frame_mask = yield self._read_bytes(4)
data = yield self._read_bytes(payloadlen)
if is_masked:
data = _websocket_mask(self._frame_mask, data)
# Decide what to do with this frame.
if opcode_is_control:
# control frames may be interleaved with a series of fragmented
# data frames, so control frames must not interact with
# self._fragmented_*
if not is_final_frame:
# control frames must not be fragmented
self._abort()
return
elif opcode == 0: # continuation frame
if self._fragmented_message_buffer is None:
# nothing to continue
self._abort()
return
self._fragmented_message_buffer += data
if is_final_frame:
opcode = self._fragmented_message_opcode
data = self._fragmented_message_buffer
self._fragmented_message_buffer = None
else: # start of new data message
if self._fragmented_message_buffer is not None:
# can't start new message until the old one is finished
self._abort()
return
if not is_final_frame:
self._fragmented_message_opcode = opcode
self._fragmented_message_buffer = data
if is_final_frame:
handled_future = self._handle_message(opcode, data)
if handled_future is not None:
yield handled_future
