# -*- coding: utf-8 -*- # Copyright 2014-2016 OpenMarket Ltd # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. import logging import sys from synapse import python_dependencies # noqa: E402 logger = logging.getLogger(__name__) try: python_dependencies.check_requirements() except python_dependencies.DependencyException as e: sys.stderr.writelines(e.message) sys.exit(1) def check_bind_error(e, address, bind_addresses): """ 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): Exception that was caught. address (str): Address on which binding was attempted. bind_addresses (list): 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 [::]" ) else: raise e