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name : _exceptions.py
 # -*- 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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