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#
# This file is licensed under the Affero General Public License (AGPL) version 3.
#
# Copyright 2014-2016 OpenMarket Ltd
# Copyright (C) 2023 New Vector, Ltd
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# See the GNU Affero General Public License for more details:
# <https://www.gnu.org/licenses/agpl-3.0.html>.
#
# Originally licensed under the Apache License, Version 2.0:
# <http://www.apache.org/licenses/LICENSE-2.0>.
#
# [This file includes modifications made by New Vector Limited]
#
#
import logging
import sys
from typing import Container
from synapse.util import check_dependencies
logger = logging.getLogger(__name__)
try:
check_dependencies.check_requirements()
except check_dependencies.DependencyException as e:
sys.stderr.writelines(
e.message # noqa: B306, DependencyException.message is a property
)
sys.exit(1)
def check_bind_error(
e: Exception, address: str, bind_addresses: Container[str]
) -> None:
"""
This method checks an exception occurred while binding on 0.0.0.0.
If :: is specified in the bind addresses a warning is shown.
The exception is still raised otherwise.
Binding on both 0.0.0.0 and :: causes an exception on Linux and macOS
because :: binds on both IPv4 and IPv6 (as per RFC 3493).
When binding on 0.0.0.0 after :: this can safely be ignored.
Args:
e: Exception that was caught.
address: Address on which binding was attempted.
bind_addresses: Addresses on which the service listens.
"""
if address == "0.0.0.0" and "::" in bind_addresses:
logger.warning(
"Failed to listen on 0.0.0.0, continuing because listening on [::]. Original exception: %s: %s",
type(e).__name__,
str(e),
)
else:
raise e
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