506 lines
17 KiB
Python
506 lines
17 KiB
Python
###############################################################################
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#
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# The MIT License (MIT)
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#
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# Copyright (c) Crossbar.io Technologies GmbH
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in
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# all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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# THE SOFTWARE.
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#
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###############################################################################
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from __future__ import absolute_import
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try:
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import asyncio
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except ImportError:
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# trollious for py2 support - however it has been deprecated
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import trollius as asyncio
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import struct
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import math
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from autobahn.util import public, _LazyHexFormatter
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from autobahn.wamp.exception import ProtocolError, SerializationError, TransportLost
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from autobahn.asyncio.util import peer2str, get_serializers
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import txaio
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__all__ = (
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'WampRawSocketServerProtocol',
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'WampRawSocketClientProtocol',
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'WampRawSocketServerFactory',
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'WampRawSocketClientFactory'
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)
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txaio.use_asyncio()
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FRAME_TYPE_DATA = 0
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FRAME_TYPE_PING = 1
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FRAME_TYPE_PONG = 2
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MAGIC_BYTE = 0x7F
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class PrefixProtocol(asyncio.Protocol):
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prefix_format = '!L'
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prefix_length = struct.calcsize(prefix_format)
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max_length = 16 * 1024 * 1024
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max_length_send = max_length
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log = txaio.make_logger() # @UndefinedVariable
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def connection_made(self, transport):
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self.transport = transport
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peer = transport.get_extra_info('peername')
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self.peer = peer2str(peer)
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self.log.debug('RawSocker Asyncio: Connection made with peer {peer}', peer=self.peer)
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self._buffer = b''
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self._header = None
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self._wait_closed = txaio.create_future()
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@property
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def is_closed(self):
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if hasattr(self, '_wait_closed'):
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return self._wait_closed
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else:
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f = txaio.create_future()
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f.set_result(True)
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return f
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def connection_lost(self, exc):
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self.log.debug('RawSocker Asyncio: Connection lost')
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self.transport = None
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self._wait_closed.set_result(True)
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self._on_connection_lost(exc)
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def _on_connection_lost(self, exc):
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pass
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def protocol_error(self, msg):
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self.log.error(msg)
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self.transport.close()
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def sendString(self, data):
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l = len(data)
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if l > self.max_length_send:
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raise ValueError('Data too big')
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header = struct.pack(self.prefix_format, len(data))
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self.transport.write(header)
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self.transport.write(data)
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def ping(self, data):
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raise NotImplementedError()
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def pong(self, data):
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raise NotImplementedError()
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def data_received(self, data):
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self._buffer += data
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pos = 0
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remaining = len(self._buffer)
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while remaining >= self.prefix_length:
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# do not recalculate header if available from previous call
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if self._header:
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frame_type, frame_length = self._header
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else:
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header = self._buffer[pos:pos + self.prefix_length]
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frame_type = ord(header[0:1]) & 0b00000111
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if frame_type > FRAME_TYPE_PONG:
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self.protocol_error('Invalid frame type')
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return
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frame_length = struct.unpack(self.prefix_format, b'\0' + header[1:])[0]
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if frame_length > self.max_length:
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self.protocol_error('Frame too big')
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return
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if remaining - self.prefix_length >= frame_length:
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self._header = None
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pos += self.prefix_length
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remaining -= self.prefix_length
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data = self._buffer[pos:pos + frame_length]
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pos += frame_length
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remaining -= frame_length
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if frame_type == FRAME_TYPE_DATA:
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self.stringReceived(data)
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elif frame_type == FRAME_TYPE_PING:
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self.ping(data)
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elif frame_type == FRAME_TYPE_PONG:
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self.pong(data)
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else:
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# save heaader
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self._header = frame_type, frame_length
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break
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self._buffer = self._buffer[:remaining]
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def stringReceived(self, data):
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raise NotImplementedError()
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class RawSocketProtocol(PrefixProtocol):
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def __init__(self):
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max_size = None
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if max_size:
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exp = int(math.ceil(math.log(max_size, 2))) - 9
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if exp > 15:
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raise ValueError('Maximum length is 16M')
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self.max_length = 2**(exp + 9)
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self._length_exp = exp
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else:
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self._length_exp = 15
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self.max_length = 2**24
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def connection_made(self, transport):
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PrefixProtocol.connection_made(self, transport)
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self._handshake_done = False
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def _on_handshake_complete(self):
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raise NotImplementedError()
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def parse_handshake(self):
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buf = bytearray(self._buffer[:4])
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if buf[0] != MAGIC_BYTE:
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raise HandshakeError('Invalid magic byte in handshake')
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return
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ser = buf[1] & 0x0F
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lexp = buf[1] >> 4
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self.max_length_send = 2**(lexp + 9)
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if buf[2] != 0 or buf[3] != 0:
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raise HandshakeError('Reserved bytes must be zero')
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return ser, lexp
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def process_handshake(self):
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raise NotImplementedError()
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def data_received(self, data):
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self.log.debug('RawSocker Asyncio: data received {data}', data=_LazyHexFormatter(data))
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if self._handshake_done:
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return PrefixProtocol.data_received(self, data)
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else:
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self._buffer += data
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if len(self._buffer) >= 4:
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try:
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self.process_handshake()
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except HandshakeError as e:
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self.protocol_error('Handshake error : {err}'.format(err=e))
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return
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self._handshake_done = True
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self._on_handshake_complete()
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data = self._buffer[4:]
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self._buffer = b''
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if data:
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PrefixProtocol.data_received(self, data)
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ERR_SERIALIZER_UNSUPPORTED = 1
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ERRMAP = {
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0: "illegal (must not be used)",
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1: "serializer unsupported",
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2: "maximum message length unacceptable",
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3: "use of reserved bits (unsupported feature)",
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4: "maximum connection count reached"
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}
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class HandshakeError(Exception):
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def __init__(self, msg, code=0):
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Exception.__init__(self, msg if not code else msg + ' : %s' % ERRMAP.get(code))
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class RawSocketClientProtocol(RawSocketProtocol):
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def check_serializer(self, ser_id):
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return True
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def process_handshake(self):
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ser_id, err = self.parse_handshake()
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if ser_id == 0:
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raise HandshakeError('Server returned handshake error', err)
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if self.serializer_id != ser_id:
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raise HandshakeError('Server returned different serializer {0} then requested {1}'
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.format(ser_id, self.serializer_id))
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@property
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def serializer_id(self):
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raise NotImplementedError()
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def connection_made(self, transport):
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RawSocketProtocol.connection_made(self, transport)
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# start handshake
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hs = bytes(bytearray([MAGIC_BYTE,
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self._length_exp << 4 | self.serializer_id,
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0, 0]))
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transport.write(hs)
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self.log.debug('RawSocket Asyncio: Client handshake sent')
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class RawSocketServerProtocol(RawSocketProtocol):
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def supports_serializer(self, ser_id):
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raise NotImplementedError()
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def process_handshake(self):
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def send_response(lexp, ser_id):
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b2 = lexp << 4 | (ser_id & 0x0f)
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self.transport.write(bytes(bytearray([MAGIC_BYTE, b2, 0, 0])))
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ser_id, _lexp = self.parse_handshake()
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if not self.supports_serializer(ser_id):
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send_response(ERR_SERIALIZER_UNSUPPORTED, 0)
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raise HandshakeError('Serializer unsupported : {ser_id}'.format(ser_id=ser_id))
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send_response(self._length_exp, ser_id)
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# this is transport independent part of WAMP protocol
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class WampRawSocketMixinGeneral(object):
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def _on_handshake_complete(self):
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self.log.debug("WampRawSocketProtocol: Handshake complete")
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try:
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self._session = self.factory._factory()
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self._session.onOpen(self)
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except Exception as e:
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# Exceptions raised in onOpen are fatal ..
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self.log.warn("WampRawSocketProtocol: ApplicationSession constructor / onOpen raised ({err})", err=e)
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self.abort()
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else:
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self.log.info("ApplicationSession started.")
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def stringReceived(self, payload):
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self.log.debug("WampRawSocketProtocol: RX octets: {octets}", octets=_LazyHexFormatter(payload))
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try:
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for msg in self._serializer.unserialize(payload):
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self.log.debug("WampRawSocketProtocol: RX WAMP message: {msg}", msg=msg)
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self._session.onMessage(msg)
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except ProtocolError as e:
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self.log.warn("WampRawSocketProtocol: WAMP Protocol Error ({err}) - aborting connection", err=e)
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self.abort()
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except Exception as e:
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self.log.warn("WampRawSocketProtocol: WAMP Internal Error ({err}) - aborting connection", err=e)
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self.abort()
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def send(self, msg):
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"""
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Implements :func:`autobahn.wamp.interfaces.ITransport.send`
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"""
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if self.isOpen():
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self.log.debug("WampRawSocketProtocol: TX WAMP message: {msg}", msg=msg)
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try:
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payload, _ = self._serializer.serialize(msg)
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except Exception as e:
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# all exceptions raised from above should be serialization errors ..
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raise SerializationError("WampRawSocketProtocol: unable to serialize WAMP application payload ({0})"
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.format(e))
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else:
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self.sendString(payload)
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self.log.debug("WampRawSocketProtocol: TX octets: {octets}", octets=_LazyHexFormatter(payload))
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else:
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raise TransportLost()
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def isOpen(self):
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"""
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Implements :func:`autobahn.wamp.interfaces.ITransport.isOpen`
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"""
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return hasattr(self, '_session') and self._session is not None
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# this is asyncio dependent part of WAMP protocol
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class WampRawSocketMixinAsyncio(object):
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"""
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Base class for asyncio-based WAMP-over-RawSocket protocols.
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"""
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def _on_connection_lost(self, exc):
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try:
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wasClean = exc is None
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self._session.onClose(wasClean)
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except Exception as e:
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# silently ignore exceptions raised here ..
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self.log.warn("WampRawSocketProtocol: ApplicationSession.onClose raised ({err})", err=e)
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self._session = None
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def close(self):
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"""
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Implements :func:`autobahn.wamp.interfaces.ITransport.close`
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"""
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if self.isOpen():
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self.transport.close()
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else:
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raise TransportLost()
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def abort(self):
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"""
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Implements :func:`autobahn.wamp.interfaces.ITransport.abort`
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"""
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if self.isOpen():
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if hasattr(self.transport, 'abort'):
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# ProcessProtocol lacks abortConnection()
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self.transport.abort()
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else:
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self.transport.close()
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else:
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raise TransportLost()
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@public
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class WampRawSocketServerProtocol(WampRawSocketMixinGeneral, WampRawSocketMixinAsyncio, RawSocketServerProtocol):
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"""
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asyncio-based WAMP-over-RawSocket server protocol.
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Implements:
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* :class:`autobahn.wamp.interfaces.ITransport`
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"""
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def supports_serializer(self, ser_id):
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if ser_id in self.factory._serializers:
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self._serializer = self.factory._serializers[ser_id]()
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self.log.debug(
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"WampRawSocketProtocol: client wants to use serializer '{serializer}'",
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serializer=ser_id,
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)
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return True
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else:
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self.log.debug(
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"WampRawSocketProtocol: opening handshake - no suitable serializer found (client requested {serializer}, and we have {serializers}",
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serializer=ser_id,
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serializers=self.factory._serializers.keys(),
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)
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self.abort()
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return False
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def get_channel_id(self, channel_id_type=u'tls-unique'):
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"""
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Implements :func:`autobahn.wamp.interfaces.ITransport.get_channel_id`
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"""
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return None
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# return transport_channel_id(self.transport, is_server=True, channel_id_type=channel_id_type)
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@public
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class WampRawSocketClientProtocol(WampRawSocketMixinGeneral, WampRawSocketMixinAsyncio, RawSocketClientProtocol):
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"""
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asyncio-based WAMP-over-RawSocket client protocol.
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Implements:
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* :class:`autobahn.wamp.interfaces.ITransport`
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"""
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@property
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def serializer_id(self):
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if not hasattr(self, '_serializer'):
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self._serializer = self.factory._serializer()
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return self._serializer.RAWSOCKET_SERIALIZER_ID
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def get_channel_id(self, channel_id_type=u'tls-unique'):
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"""
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Implements :func:`autobahn.wamp.interfaces.ITransport.get_channel_id`
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"""
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return None
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# return transport_channel_id(self.transport, is_server=False, channel_id_type=channel_id_type)
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class WampRawSocketFactory(object):
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"""
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Adapter class for asyncio-based WebSocket client and server factories.def dataReceived(self, data):
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"""
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log = txaio.make_logger()
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@public
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def __call__(self):
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proto = self.protocol()
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proto.factory = self
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return proto
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@public
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class WampRawSocketServerFactory(WampRawSocketFactory):
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"""
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asyncio-based WAMP-over-RawSocket server protocol factory.
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"""
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protocol = WampRawSocketServerProtocol
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def __init__(self, factory, serializers=None):
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"""
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:param factory: A callable that produces instances that implement
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:class:`autobahn.wamp.interfaces.ITransportHandler`
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:type factory: callable
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:param serializers: A list of WAMP serializers to use (or ``None``
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for all available serializers).
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:type serializers: list of objects implementing
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:class:`autobahn.wamp.interfaces.ISerializer`
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"""
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if callable(factory):
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self._factory = factory
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else:
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self._factory = lambda: factory
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# when no serializers were requested specifically, then support
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# all that are available
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if serializers is None:
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serializers = get_serializers()
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if not serializers:
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raise Exception("could not import any WAMP serializers")
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self._serializers = {ser.RAWSOCKET_SERIALIZER_ID: ser for ser in serializers}
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@public
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class WampRawSocketClientFactory(WampRawSocketFactory):
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"""
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asyncio-based WAMP-over-RawSocket client factory.
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"""
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protocol = WampRawSocketClientProtocol
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def __init__(self, factory, serializer=None):
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"""
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:param factory: A callable that produces instances that implement
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:class:`autobahn.wamp.interfaces.ITransportHandler`
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:type factory: callable
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:param serializer: The WAMP serializer to use (or ``None`` for
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"best" serializer, chosen as the first serializer available from
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this list: CBOR, MessagePack, UBJSON, JSON).
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:type serializer: object implementing :class:`autobahn.wamp.interfaces.ISerializer`
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"""
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if callable(factory):
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self._factory = factory
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else:
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self._factory = lambda: factory
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# when no serializer was requested specifically, use the first
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# one available
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if serializer is None:
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serializers = get_serializers()
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if serializers:
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serializer = serializers[0]
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if serializer is None:
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raise Exception("could not import any WAMP serializer")
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self._serializer = serializer
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