447 lines
18 KiB
Python
447 lines
18 KiB
Python
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###############################################################################
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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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import bz2
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from autobahn.websocket.compress_base import PerMessageCompressOffer, \
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PerMessageCompressOfferAccept, \
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PerMessageCompressResponse, \
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PerMessageCompressResponseAccept, \
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PerMessageCompress
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__all__ = (
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'PerMessageBzip2Mixin',
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'PerMessageBzip2Offer',
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'PerMessageBzip2OfferAccept',
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'PerMessageBzip2Response',
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'PerMessageBzip2ResponseAccept',
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'PerMessageBzip2',
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)
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class PerMessageBzip2Mixin(object):
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"""
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Mixin class for this extension.
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"""
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EXTENSION_NAME = "permessage-bzip2"
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"""
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Name of this WebSocket extension.
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"""
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COMPRESS_LEVEL_PERMISSIBLE_VALUES = [1, 2, 3, 4, 5, 6, 7, 8, 9]
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"""
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Permissible value for compression level parameter.
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"""
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class PerMessageBzip2Offer(PerMessageCompressOffer, PerMessageBzip2Mixin):
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"""
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Set of extension parameters for `permessage-bzip2` WebSocket extension
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offered by a client to a server.
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"""
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@classmethod
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def parse(cls, params):
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"""
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Parses a WebSocket extension offer for `permessage-bzip2` provided by a client to a server.
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:param params: Output from :func:`autobahn.websocket.WebSocketProtocol._parseExtensionsHeader`.
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:type params: list
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:returns: object -- A new instance of :class:`autobahn.compress.PerMessageBzip2Offer`.
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"""
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# extension parameter defaults
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accept_max_compress_level = False
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request_max_compress_level = 0
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# verify/parse client ("client-to-server direction") parameters of permessage-bzip2 offer
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for p in params:
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if len(params[p]) > 1:
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raise Exception("multiple occurrence of extension parameter '%s' for extension '%s'" % (p, cls.EXTENSION_NAME))
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val = params[p][0]
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if p == 'client_max_compress_level':
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# noinspection PySimplifyBooleanCheck
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if val is not True:
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raise Exception("illegal extension parameter value '%s' for parameter '%s' of extension '%s'" % (val, p, cls.EXTENSION_NAME))
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else:
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accept_max_compress_level = True
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elif p == 'server_max_compress_level':
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try:
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val = int(val)
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except:
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raise Exception("illegal extension parameter value '%s' for parameter '%s' of extension '%s'" % (val, p, cls.EXTENSION_NAME))
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if val not in PerMessageBzip2Mixin.COMPRESS_LEVEL_PERMISSIBLE_VALUES:
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raise Exception("illegal extension parameter value '%s' for parameter '%s' of extension '%s'" % (val, p, cls.EXTENSION_NAME))
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else:
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request_max_compress_level = val
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else:
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raise Exception("illegal extension parameter '%s' for extension '%s'" % (p, cls.EXTENSION_NAME))
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offer = cls(accept_max_compress_level,
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request_max_compress_level)
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return offer
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def __init__(self,
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accept_max_compress_level=True,
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request_max_compress_level=0):
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"""
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Constructor.
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:param accept_max_compress_level: Iff true, client accepts "maximum compression level" parameter.
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:type accept_max_compress_level: bool
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:param request_max_compress_level: Iff non-zero, client requests given "maximum compression level" - must be 1-9.
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:type request_max_compress_level: int
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"""
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if type(accept_max_compress_level) != bool:
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raise Exception("invalid type %s for accept_max_compress_level" % type(accept_max_compress_level))
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self.accept_max_compress_level = accept_max_compress_level
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if request_max_compress_level != 0 and request_max_compress_level not in self.COMPRESS_LEVEL_PERMISSIBLE_VALUES:
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raise Exception("invalid value %s for request_max_compress_level - permissible values %s" % (request_max_compress_level, self.COMPRESS_LEVEL_PERMISSIBLE_VALUES))
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self.request_max_compress_level = request_max_compress_level
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def get_extension_string(self):
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"""
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Returns the WebSocket extension configuration string as sent to the server.
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:returns: PMCE configuration string.
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:rtype: str
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"""
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pmce_string = self.EXTENSION_NAME
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if self.accept_max_compress_level:
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pmce_string += "; client_max_compress_level"
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if self.request_max_compress_level != 0:
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pmce_string += "; server_max_compress_level=%d" % self.request_max_compress_level
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return pmce_string
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def __json__(self):
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"""
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Returns a JSON serializable object representation.
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:returns: JSON serializable representation.
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:rtype: dict
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"""
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return {'extension': self.EXTENSION_NAME,
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'accept_max_compress_level': self.accept_max_compress_level,
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'request_max_compress_level': self.request_max_compress_level}
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def __repr__(self):
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"""
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Returns Python object representation that can be eval'ed to reconstruct the object.
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:returns: Python string representation.
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:rtype: str
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"""
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return "PerMessageBzip2Offer(accept_max_compress_level = %s, request_max_compress_level = %s)" % (self.accept_max_compress_level, self.request_max_compress_level)
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class PerMessageBzip2OfferAccept(PerMessageCompressOfferAccept, PerMessageBzip2Mixin):
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"""
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Set of parameters with which to accept an `permessage-bzip2` offer
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from a client by a server.
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"""
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def __init__(self,
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offer,
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request_max_compress_level=0,
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compress_level=None):
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"""
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Constructor.
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:param offer: The offer being accepted.
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:type offer: Instance of :class:`autobahn.compress.PerMessageBzip2Offer`.
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:param request_max_compress_level: Iff non-zero, server requests given "maximum compression level" - must be 1-9.
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:type request_max_compress_level: int
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:param compress_level: Override server ("server-to-client direction") compress level (this must be compatible with offer).
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:type compress_level: int
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"""
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if not isinstance(offer, PerMessageBzip2Offer):
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raise Exception("invalid type %s for offer" % type(offer))
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self.offer = offer
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if request_max_compress_level != 0 and request_max_compress_level not in self.COMPRESS_LEVEL_PERMISSIBLE_VALUES:
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raise Exception("invalid value %s for request_max_compress_level - permissible values %s" % (request_max_compress_level, self.COMPRESS_LEVEL_PERMISSIBLE_VALUES))
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if request_max_compress_level != 0 and not offer.accept_max_compress_level:
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raise Exception("invalid value %s for request_max_compress_level - feature unsupported by client" % request_max_compress_level)
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self.request_max_compress_level = request_max_compress_level
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if compress_level is not None:
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if compress_level not in self.COMPRESS_LEVEL_PERMISSIBLE_VALUES:
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raise Exception("invalid value %s for compress_level - permissible values %s" % (compress_level, self.COMPRESS_LEVEL_PERMISSIBLE_VALUES))
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if offer.request_max_compress_level != 0 and compress_level > offer.request_max_compress_level:
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raise Exception("invalid value %s for compress_level - client requested lower maximum value" % compress_level)
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self.compress_level = compress_level
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def get_extension_string(self):
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"""
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Returns the WebSocket extension configuration string as sent to the server.
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:returns: PMCE configuration string.
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:rtype: str
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"""
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pmce_string = self.EXTENSION_NAME
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if self.offer.request_max_compress_level != 0:
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pmce_string += "; server_max_compress_level=%d" % self.offer.request_max_compress_level
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if self.request_max_compress_level != 0:
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pmce_string += "; client_max_compress_level=%d" % self.request_max_compress_level
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return pmce_string
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def __json__(self):
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"""
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Returns a JSON serializable object representation.
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:returns: JSON serializable representation.
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:rtype: dict
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"""
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return {'extension': self.EXTENSION_NAME,
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'offer': self.offer.__json__(),
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'request_max_compress_level': self.request_max_compress_level,
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'compress_level': self.compress_level}
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def __repr__(self):
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"""
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Returns Python object representation that can be eval'ed to reconstruct the object.
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:returns: Python string representation.
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:rtype: str
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"""
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return "PerMessageBzip2Accept(offer = %s, request_max_compress_level = %s, compress_level = %s)" % (self.offer.__repr__(), self.request_max_compress_level, self.compress_level)
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class PerMessageBzip2Response(PerMessageCompressResponse, PerMessageBzip2Mixin):
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"""
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Set of parameters for `permessage-bzip2` responded by server.
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"""
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@classmethod
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def parse(cls, params):
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"""
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Parses a WebSocket extension response for `permessage-bzip2` provided by a server to a client.
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:param params: Output from :func:`autobahn.websocket.WebSocketProtocol._parseExtensionsHeader`.
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:type params: list
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:returns: A new instance of :class:`autobahn.compress.PerMessageBzip2Response`.
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:rtype: obj
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"""
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client_max_compress_level = 0
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server_max_compress_level = 0
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for p in params:
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if len(params[p]) > 1:
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raise Exception("multiple occurrence of extension parameter '%s' for extension '%s'" % (p, cls.EXTENSION_NAME))
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val = params[p][0]
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if p == 'client_max_compress_level':
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try:
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val = int(val)
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except:
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raise Exception("illegal extension parameter value '%s' for parameter '%s' of extension '%s'" % (val, p, cls.EXTENSION_NAME))
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if val not in PerMessageBzip2Mixin.COMPRESS_LEVEL_PERMISSIBLE_VALUES:
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raise Exception("illegal extension parameter value '%s' for parameter '%s' of extension '%s'" % (val, p, cls.EXTENSION_NAME))
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else:
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client_max_compress_level = val
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elif p == 'server_max_compress_level':
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try:
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val = int(val)
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except:
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raise Exception("illegal extension parameter value '%s' for parameter '%s' of extension '%s'" % (val, p, cls.EXTENSION_NAME))
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if val not in PerMessageBzip2Mixin.COMPRESS_LEVEL_PERMISSIBLE_VALUES:
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raise Exception("illegal extension parameter value '%s' for parameter '%s' of extension '%s'" % (val, p, cls.EXTENSION_NAME))
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else:
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server_max_compress_level = val
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else:
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raise Exception("illegal extension parameter '%s' for extension '%s'" % (p, cls.EXTENSION_NAME))
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response = cls(client_max_compress_level,
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server_max_compress_level)
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return response
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def __init__(self,
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client_max_compress_level,
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server_max_compress_level):
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self.client_max_compress_level = client_max_compress_level
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self.server_max_compress_level = server_max_compress_level
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def __json__(self):
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"""
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Returns a JSON serializable object representation.
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:returns: JSON serializable representation.
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:rtype: dict
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"""
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return {'extension': self.EXTENSION_NAME,
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'client_max_compress_level': self.client_max_compress_level,
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'server_max_compress_level': self.server_max_compress_level}
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def __repr__(self):
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"""
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Returns Python object representation that can be eval'ed to reconstruct the object.
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:returns: Python string representation.
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:rtype: str
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"""
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return "PerMessageBzip2Response(client_max_compress_level = %s, server_max_compress_level = %s)" % (self.client_max_compress_level, self.server_max_compress_level)
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class PerMessageBzip2ResponseAccept(PerMessageCompressResponseAccept, PerMessageBzip2Mixin):
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"""
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Set of parameters with which to accept an `permessage-bzip2` response
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from a server by a client.
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"""
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def __init__(self,
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response,
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compress_level=None):
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"""
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:param response: The response being accepted.
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:type response: Instance of :class:`autobahn.compress.PerMessageBzip2Response`.
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:param compress_level: Override client ("client-to-server direction") compress level (this must be compatible with response).
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:type compress_level: int
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"""
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if not isinstance(response, PerMessageBzip2Response):
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raise Exception("invalid type %s for response" % type(response))
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self.response = response
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if compress_level is not None:
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if compress_level not in self.COMPRESS_LEVEL_PERMISSIBLE_VALUES:
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raise Exception("invalid value %s for compress_level - permissible values %s" % (compress_level, self.COMPRESS_LEVEL_PERMISSIBLE_VALUES))
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if response.client_max_compress_level != 0 and compress_level > response.client_max_compress_level:
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raise Exception("invalid value %s for compress_level - server requested lower maximum value" % compress_level)
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self.compress_level = compress_level
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def __json__(self):
|
||
|
|
"""
|
||
|
|
Returns a JSON serializable object representation.
|
||
|
|
|
||
|
|
:returns: JSON serializable representation.
|
||
|
|
:rtype: dict
|
||
|
|
"""
|
||
|
|
return {'extension': self.EXTENSION_NAME,
|
||
|
|
'response': self.response.__json__(),
|
||
|
|
'compress_level': self.compress_level}
|
||
|
|
|
||
|
|
def __repr__(self):
|
||
|
|
"""
|
||
|
|
Returns Python object representation that can be eval'ed to reconstruct the object.
|
||
|
|
|
||
|
|
:returns: Python string representation.
|
||
|
|
:rtype: str
|
||
|
|
"""
|
||
|
|
return "PerMessageBzip2ResponseAccept(response = %s, compress_level = %s)" % (self.response.__repr__(), self.compress_level)
|
||
|
|
|
||
|
|
|
||
|
|
class PerMessageBzip2(PerMessageCompress, PerMessageBzip2Mixin):
|
||
|
|
"""
|
||
|
|
`permessage-bzip2` WebSocket extension processor.
|
||
|
|
"""
|
||
|
|
DEFAULT_COMPRESS_LEVEL = 9
|
||
|
|
|
||
|
|
@classmethod
|
||
|
|
def create_from_response_accept(cls, is_server, accept):
|
||
|
|
pmce = cls(is_server,
|
||
|
|
accept.response.server_max_compress_level,
|
||
|
|
accept.compress_level if accept.compress_level is not None else accept.response.client_max_compress_level)
|
||
|
|
return pmce
|
||
|
|
|
||
|
|
@classmethod
|
||
|
|
def create_from_offer_accept(cls, is_server, accept):
|
||
|
|
pmce = cls(is_server,
|
||
|
|
accept.compress_level if accept.compress_level is not None else accept.offer.request_max_compress_level,
|
||
|
|
accept.request_max_compress_level)
|
||
|
|
return pmce
|
||
|
|
|
||
|
|
def __init__(self,
|
||
|
|
is_server,
|
||
|
|
server_max_compress_level,
|
||
|
|
client_max_compress_level):
|
||
|
|
self._isServer = is_server
|
||
|
|
self._compressor = None
|
||
|
|
self._decompressor = None
|
||
|
|
|
||
|
|
self.server_max_compress_level = server_max_compress_level if server_max_compress_level != 0 else self.DEFAULT_COMPRESS_LEVEL
|
||
|
|
self.client_max_compress_level = client_max_compress_level if client_max_compress_level != 0 else self.DEFAULT_COMPRESS_LEVEL
|
||
|
|
|
||
|
|
def __json__(self):
|
||
|
|
return {'extension': self.EXTENSION_NAME,
|
||
|
|
'isServer': self._isServer,
|
||
|
|
'server_max_compress_level': self.server_max_compress_level,
|
||
|
|
'client_max_compress_level': self.client_max_compress_level}
|
||
|
|
|
||
|
|
def __repr__(self):
|
||
|
|
return "PerMessageBzip2(isServer = %s, server_max_compress_level = %s, client_max_compress_level = %s)" % (self._isServer, self.server_max_compress_level, self.client_max_compress_level)
|
||
|
|
|
||
|
|
def start_compress_message(self):
|
||
|
|
if self._isServer:
|
||
|
|
if self._compressor is None:
|
||
|
|
self._compressor = bz2.BZ2Compressor(self.server_max_compress_level)
|
||
|
|
else:
|
||
|
|
if self._compressor is None:
|
||
|
|
self._compressor = bz2.BZ2Compressor(self.client_max_compress_level)
|
||
|
|
|
||
|
|
def compress_message_data(self, data):
|
||
|
|
return self._compressor.compress(data)
|
||
|
|
|
||
|
|
def end_compress_message(self):
|
||
|
|
data = self._compressor.flush()
|
||
|
|
|
||
|
|
# there seems to be no "flush without close stream", and after
|
||
|
|
# full flush, compressor must not be reused
|
||
|
|
self._compressor = None
|
||
|
|
|
||
|
|
return data
|
||
|
|
|
||
|
|
def start_decompress_message(self):
|
||
|
|
if self._decompressor is None:
|
||
|
|
self._decompressor = bz2.BZ2Decompressor()
|
||
|
|
|
||
|
|
def decompress_message_data(self, data):
|
||
|
|
return self._decompressor.decompress(data)
|
||
|
|
|
||
|
|
def end_decompress_message(self):
|
||
|
|
self._decompressor = None
|