_stream_exceptions.py (2916B)
1 # Copyright 2020, 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 """Stream Exceptions. 30 """ 31 32 # Note: request.connection.write/read are used in this module, even though 33 # mod_python document says that they should be used only in connection 34 # handlers. Unfortunately, we have no other options. For example, 35 # request.write/read are not suitable because they don't allow direct raw bytes 36 # writing/reading. 37 38 39 # Exceptions 40 class ConnectionTerminatedException(Exception): 41 """This exception will be raised when a connection is terminated 42 unexpectedly. 43 """ 44 45 pass 46 47 48 class InvalidFrameException(ConnectionTerminatedException): 49 """This exception will be raised when we received an invalid frame we 50 cannot parse. 51 """ 52 53 pass 54 55 56 class BadOperationException(Exception): 57 """This exception will be raised when send_message() is called on 58 server-terminated connection or receive_message() is called on 59 client-terminated connection. 60 """ 61 62 pass 63 64 65 class UnsupportedFrameException(Exception): 66 """This exception will be raised when we receive a frame with flag, opcode 67 we cannot handle. Handlers can just catch and ignore this exception and 68 call receive_message() again to continue processing the next frame. 69 """ 70 71 pass 72 73 74 class InvalidUTF8Exception(Exception): 75 """This exception will be raised when we receive a text frame which 76 contains invalid UTF-8 strings. 77 """ 78 79 pass 80 81 82 # vi:sts=4 sw=4 et