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import logging

from localstack import config

from localstack.runtime import hooks

LOG = logging.getLogger(__name__)

# Note: Don't want to introduce a possible import order conflict by importing SERVICE_SHUTDOWN_PRIORITY

# TODO: consider extracting these priorities into some static configuration

DNS_SHUTDOWN_PRIORITY = -30

"""Make sure the DNS server is shut down after the ON_AFTER_SERVICE_SHUTDOWN_HANDLERS, which in turn is after

SERVICE_SHUTDOWN_PRIORITY. Currently this value needs to be less than -20"""

DNS_START_PRIORITY = 20

"""Make sure the DNS server is started before the pro activation, to ensure proper DNS resolution for the activate call,

if the resolv.conf is set to localhost from outside the container"""

@hooks.on_infra_start(priority=DNS_START_PRIORITY)

def start_dns_server():

try:

from localstack.dns import server

server.start_dns_server(port=config.DNS_PORT, asynchronous=True)

except Exception as e:

LOG.warning("Unable to start DNS: %s", e)

@hooks.on_infra_start()

def setup_dns_configuration_on_host():

try:

from localstack.dns import server

if server.is_server_running():

# Prepare network interfaces for DNS server for the infra.

server.setup_network_configuration()

except Exception as e:

LOG.warning("error setting up dns server: %s", e)

@hooks.on_infra_shutdown(priority=DNS_SHUTDOWN_PRIORITY)

def stop_server():

try:

from localstack.dns import server

server.revert_network_configuration()

server.stop_servers()

except Exception as e:

LOG.warning("Unable to stop DNS servers: %s", e)