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0823794e32
--HG-- extra : transplant_source : %27%05%5C%B1%E8j2%22q%BE%BBY%D7%8B9%81%18%18I%03
156 lines
4.9 KiB
Python
156 lines
4.9 KiB
Python
# Copyright 2011, Google Inc.
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met:
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#
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# * Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above
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# copyright notice, this list of conditions and the following disclaimer
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# in the documentation and/or other materials provided with the
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# distribution.
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# * Neither the name of Google Inc. nor the names of its
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# contributors may be used to endorse or promote products derived from
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# this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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"""Base stream class.
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"""
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# Note: request.connection.write/read are used in this module, even though
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# mod_python document says that they should be used only in connection
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# handlers. Unfortunately, we have no other options. For example,
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# request.write/read are not suitable because they don't allow direct raw bytes
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# writing/reading.
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from mod_pywebsocket import util
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# Exceptions
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class ConnectionTerminatedException(Exception):
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"""This exception will be raised when a connection is terminated
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unexpectedly.
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"""
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pass
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class InvalidFrameException(ConnectionTerminatedException):
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"""This exception will be raised when we received an invalid frame we
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cannot parse.
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"""
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pass
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class BadOperationException(RuntimeError):
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"""This exception will be raised when send_message() is called on
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server-terminated connection or receive_message() is called on
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client-terminated connection.
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"""
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pass
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class UnsupportedFrameException(RuntimeError):
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"""This exception will be raised when we receive a frame with flag, opcode
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we cannot handle. Handlers can just catch and ignore this exception and
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call receive_message() again to continue processing the next frame.
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"""
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pass
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class StreamBase(object):
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"""Base stream class."""
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def __init__(self, request):
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"""Construct an instance.
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Args:
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request: mod_python request.
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"""
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self._logger = util.get_class_logger(self)
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self._request = request
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def _read(self, length):
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"""Reads length bytes from connection. In case we catch any exception,
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prepends remote address to the exception message and raise again.
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Raises:
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ConnectionTerminatedException: when read returns empty string.
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"""
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bytes = self._request.connection.read(length)
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if not bytes:
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raise ConnectionTerminatedException('connection terminated: read failed')
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return bytes
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def _write(self, bytes):
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"""Writes given bytes to connection. In case we catch any exception,
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prepends remote address to the exception message and raise again.
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"""
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try:
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self._request.connection.write(bytes)
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except Exception, e:
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util.prepend_message_to_exception(
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'Failed to send message to %r: ' %
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(self._request.connection.remote_addr,),
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e)
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raise
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def receive_bytes(self, length):
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"""Receives multiple bytes. Retries read when we couldn't receive the
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specified amount.
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Raises:
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ConnectionTerminatedException: when read returns empty string.
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"""
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bytes = []
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while length > 0:
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new_bytes = self._read(length)
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bytes.append(new_bytes)
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length -= len(new_bytes)
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return ''.join(bytes)
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def flushread(self):
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try:
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self._request.connection.flushread()
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except:
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pass
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def _read_until(self, delim_char):
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"""Reads bytes until we encounter delim_char. The result will not
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contain delim_char.
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Raises:
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ConnectionTerminatedException: when read returns empty string.
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"""
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bytes = []
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while True:
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ch = self._read(1)
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if ch == delim_char:
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break
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bytes.append(ch)
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return ''.join(bytes)
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# vi:sts=4 sw=4 et
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