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comparison: testing/mochitest/pywebsocket/mod_pywebsocket/extensions.py
testing/mochitest/pywebsocket/mod_pywebsocket/extensions.py
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| 1 # Copyright 2011, Google Inc. | |
| 2 # All rights reserved. | |
| 3 # | |
| 4 # Redistribution and use in source and binary forms, with or without | |
| 5 # modification, are permitted provided that the following conditions are | |
| 6 # met: | |
| 7 # | |
| 8 # * Redistributions of source code must retain the above copyright | |
| 9 # notice, this list of conditions and the following disclaimer. | |
| 10 # * Redistributions in binary form must reproduce the above | |
| 11 # copyright notice, this list of conditions and the following disclaimer | |
| 12 # in the documentation and/or other materials provided with the | |
| 13 # distribution. | |
| 14 # * Neither the name of Google Inc. nor the names of its | |
| 15 # contributors may be used to endorse or promote products derived from | |
| 16 # this software without specific prior written permission. | |
| 17 # | |
| 18 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
| 19 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
| 20 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
| 21 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
| 22 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
| 23 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
| 24 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
| 25 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
| 26 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 27 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 28 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 29 | |
| 30 | |
| 31 from mod_pywebsocket import common | |
| 32 from mod_pywebsocket import util | |
| 33 | |
| 34 | |
| 35 _available_processors = {} | |
| 36 | |
| 37 | |
| 38 class ExtensionProcessorInterface(object): | |
| 39 | |
| 40 def get_extension_response(self): | |
| 41 return None | |
| 42 | |
| 43 def setup_stream_options(self, stream_options): | |
| 44 pass | |
| 45 | |
| 46 | |
| 47 class DeflateStreamExtensionProcessor(ExtensionProcessorInterface): | |
| 48 """WebSocket DEFLATE stream extension processor.""" | |
| 49 | |
| 50 def __init__(self, request): | |
| 51 self._logger = util.get_class_logger(self) | |
| 52 | |
| 53 self._request = request | |
| 54 | |
| 55 def get_extension_response(self): | |
| 56 if len(self._request.get_parameter_names()) != 0: | |
| 57 return None | |
| 58 | |
| 59 self._logger.debug( | |
| 60 'Enable %s extension', common.DEFLATE_STREAM_EXTENSION) | |
| 61 | |
| 62 return common.ExtensionParameter(common.DEFLATE_STREAM_EXTENSION) | |
| 63 | |
| 64 def setup_stream_options(self, stream_options): | |
| 65 stream_options.deflate_stream = True | |
| 66 | |
| 67 | |
| 68 _available_processors[common.DEFLATE_STREAM_EXTENSION] = ( | |
| 69 DeflateStreamExtensionProcessor) | |
| 70 | |
| 71 | |
| 72 class DeflateFrameExtensionProcessor(ExtensionProcessorInterface): | |
| 73 """WebSocket Per-frame DEFLATE extension processor.""" | |
| 74 | |
| 75 _WINDOW_BITS_PARAM = 'max_window_bits' | |
| 76 _NO_CONTEXT_TAKEOVER_PARAM = 'no_context_takeover' | |
| 77 | |
| 78 def __init__(self, request): | |
| 79 self._logger = util.get_class_logger(self) | |
| 80 | |
| 81 self._request = request | |
| 82 | |
| 83 self._response_window_bits = None | |
| 84 self._response_no_context_takeover = False | |
| 85 | |
| 86 # Counters for statistics. | |
| 87 | |
| 88 # Total number of outgoing bytes supplied to this filter. | |
| 89 self._total_outgoing_payload_bytes = 0 | |
| 90 # Total number of bytes sent to the network after applying this filter. | |
| 91 self._total_filtered_outgoing_payload_bytes = 0 | |
| 92 | |
| 93 # Total number of bytes received from the network. | |
| 94 self._total_incoming_payload_bytes = 0 | |
| 95 # Total number of incoming bytes obtained after applying this filter. | |
| 96 self._total_filtered_incoming_payload_bytes = 0 | |
| 97 | |
| 98 def get_extension_response(self): | |
| 99 # Any unknown parameter will be just ignored. | |
| 100 | |
| 101 window_bits = self._request.get_parameter_value( | |
| 102 self._WINDOW_BITS_PARAM) | |
| 103 no_context_takeover = self._request.has_parameter( | |
| 104 self._NO_CONTEXT_TAKEOVER_PARAM) | |
| 105 if (no_context_takeover and | |
| 106 self._request.get_parameter_value( | |
| 107 self._NO_CONTEXT_TAKEOVER_PARAM) is not None): | |
| 108 return None | |
| 109 | |
| 110 if window_bits is not None: | |
| 111 try: | |
| 112 window_bits = int(window_bits) | |
| 113 except ValueError, e: | |
| 114 return None | |
| 115 if window_bits < 8 or window_bits > 15: | |
| 116 return None | |
| 117 | |
| 118 self._deflater = util._RFC1979Deflater( | |
| 119 window_bits, no_context_takeover) | |
| 120 | |
| 121 self._inflater = util._RFC1979Inflater() | |
| 122 | |
| 123 self._compress_outgoing = True | |
| 124 | |
| 125 response = common.ExtensionParameter(self._request.name()) | |
| 126 | |
| 127 if self._response_window_bits is not None: | |
| 128 response.add_parameter( | |
| 129 self._WINDOW_BITS_PARAM, str(self._response_window_bits)) | |
| 130 if self._response_no_context_takeover: | |
| 131 response.add_parameter( | |
| 132 self._NO_CONTEXT_TAKEOVER_PARAM, None) | |
| 133 | |
| 134 self._logger.debug( | |
| 135 'Enable %s extension (' | |
| 136 'request: window_bits=%s; no_context_takeover=%r, ' | |
| 137 'response: window_wbits=%s; no_context_takeover=%r)' % | |
| 138 (self._request.name(), | |
| 139 window_bits, | |
| 140 no_context_takeover, | |
| 141 self._response_window_bits, | |
| 142 self._response_no_context_takeover)) | |
| 143 | |
| 144 return response | |
| 145 | |
| 146 def setup_stream_options(self, stream_options): | |
| 147 | |
| 148 class _OutgoingFilter(object): | |
| 149 | |
| 150 def __init__(self, parent): | |
| 151 self._parent = parent | |
| 152 | |
| 153 def filter(self, frame): | |
| 154 self._parent._outgoing_filter(frame) | |
| 155 | |
| 156 class _IncomingFilter(object): | |
| 157 | |
| 158 def __init__(self, parent): | |
| 159 self._parent = parent | |
| 160 | |
| 161 def filter(self, frame): | |
| 162 self._parent._incoming_filter(frame) | |
| 163 | |
| 164 stream_options.outgoing_frame_filters.append( | |
| 165 _OutgoingFilter(self)) | |
| 166 stream_options.incoming_frame_filters.insert( | |
| 167 0, _IncomingFilter(self)) | |
| 168 | |
| 169 def set_response_window_bits(self, value): | |
| 170 self._response_window_bits = value | |
| 171 | |
| 172 def set_response_no_context_takeover(self, value): | |
| 173 self._response_no_context_takeover = value | |
| 174 | |
| 175 def enable_outgoing_compression(self): | |
| 176 self._compress_outgoing = True | |
| 177 | |
| 178 def disable_outgoing_compression(self): | |
| 179 self._compress_outgoing = False | |
| 180 | |
| 181 def _outgoing_filter(self, frame): | |
| 182 """Transform outgoing frames. This method is called only by | |
| 183 an _OutgoingFilter instance. | |
| 184 """ | |
| 185 | |
| 186 original_payload_size = len(frame.payload) | |
| 187 self._total_outgoing_payload_bytes += original_payload_size | |
| 188 | |
| 189 if (not self._compress_outgoing or | |
| 190 common.is_control_opcode(frame.opcode)): | |
| 191 self._total_filtered_outgoing_payload_bytes += ( | |
| 192 original_payload_size) | |
| 193 return | |
| 194 | |
| 195 frame.payload = self._deflater.filter(frame.payload) | |
| 196 frame.rsv1 = 1 | |
| 197 | |
| 198 filtered_payload_size = len(frame.payload) | |
| 199 self._total_filtered_outgoing_payload_bytes += filtered_payload_size | |
| 200 | |
| 201 # Print inf when ratio is not available. | |
| 202 ratio = float('inf') | |
| 203 average_ratio = float('inf') | |
| 204 if original_payload_size != 0: | |
| 205 ratio = float(filtered_payload_size) / original_payload_size | |
| 206 if self._total_outgoing_payload_bytes != 0: | |
| 207 average_ratio = ( | |
| 208 float(self._total_filtered_outgoing_payload_bytes) / | |
| 209 self._total_outgoing_payload_bytes) | |
| 210 self._logger.debug( | |
| 211 'Outgoing compress ratio: %f (average: %f)' % | |
| 212 (ratio, average_ratio)) | |
| 213 | |
| 214 def _incoming_filter(self, frame): | |
| 215 """Transform incoming frames. This method is called only by | |
| 216 an _IncomingFilter instance. | |
| 217 """ | |
| 218 | |
| 219 received_payload_size = len(frame.payload) | |
| 220 self._total_incoming_payload_bytes += received_payload_size | |
| 221 | |
| 222 if frame.rsv1 != 1 or common.is_control_opcode(frame.opcode): | |
| 223 self._total_filtered_incoming_payload_bytes += ( | |
| 224 received_payload_size) | |
| 225 return | |
| 226 | |
| 227 frame.payload = self._inflater.filter(frame.payload) | |
| 228 frame.rsv1 = 0 | |
| 229 | |
| 230 filtered_payload_size = len(frame.payload) | |
| 231 self._total_filtered_incoming_payload_bytes += filtered_payload_size | |
| 232 | |
| 233 # Print inf when ratio is not available. | |
| 234 ratio = float('inf') | |
| 235 average_ratio = float('inf') | |
| 236 if received_payload_size != 0: | |
| 237 ratio = float(received_payload_size) / filtered_payload_size | |
| 238 if self._total_filtered_incoming_payload_bytes != 0: | |
| 239 average_ratio = ( | |
| 240 float(self._total_incoming_payload_bytes) / | |
| 241 self._total_filtered_incoming_payload_bytes) | |
| 242 self._logger.debug( | |
| 243 'Incoming compress ratio: %f (average: %f)' % | |
| 244 (ratio, average_ratio)) | |
| 245 | |
| 246 | |
| 247 _available_processors[common.DEFLATE_FRAME_EXTENSION] = ( | |
| 248 DeflateFrameExtensionProcessor) | |
| 249 | |
| 250 | |
| 251 # Adding vendor-prefixed deflate-frame extension. | |
| 252 # TODO(bashi): Remove this after WebKit stops using vender prefix. | |
| 253 _available_processors[common.X_WEBKIT_DEFLATE_FRAME_EXTENSION] = ( | |
| 254 DeflateFrameExtensionProcessor) | |
| 255 | |
| 256 | |
| 257 def get_extension_processor(extension_request): | |
| 258 global _available_processors | |
| 259 processor_class = _available_processors.get(extension_request.name()) | |
| 260 if processor_class is None: | |
| 261 return None | |
| 262 return processor_class(extension_request) | |
| 263 | |
| 264 | |
| 265 # vi:sts=4 sw=4 et |
