Viewing file:  _exceptions.py (1.15 KB) -rw-r--r--
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# -*- test-case-name: twisted.protocols.haproxy.test -*-
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
HAProxy specific exceptions.
"""
import contextlib
from typing import Callable, Generator, Type
class InvalidProxyHeader(Exception):
"""
The provided PROXY protocol header is invalid.
"""
class InvalidNetworkProtocol(InvalidProxyHeader):
"""
The network protocol was not one of TCP4 TCP6 or UNKNOWN.
"""
class MissingAddressData(InvalidProxyHeader):
"""
The address data is missing or incomplete.
"""
@contextlib.contextmanager
def convertError(
sourceType: Type[BaseException], targetType: Callable[[], BaseException]
) -> Generator[None, None, None]:
"""
Convert an error into a different error type.
@param sourceType: The type of exception that should be caught and
converted.
@type sourceType: L{BaseException}
@param targetType: The type of exception to which the original should be
converted.
@type targetType: L{BaseException}
"""
try:
yield
except sourceType as e:
raise targetType().with_traceback(e.__traceback__)
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