90 lines
2.7 KiB
Python
Executable File
90 lines
2.7 KiB
Python
Executable File
#!/usr/bin/env python3
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import asyncio
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import ecs_logging
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import logging
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import os
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import sys
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from kubernetes_asyncio.client.api_client import ApiClient
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from kubernetes_asyncio import client, config, watch
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from time import time
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# Get the Logger
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logger = logging.getLogger()
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logger.setLevel(logging.INFO)
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# Add an ECS formatter to the Handler
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handler = logging.StreamHandler()
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handler.setFormatter(ecs_logging.StdlibFormatter())
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logger.addHandler(handler)
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ZONEFILE_TEMPLATE = """
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@ IN SOA ns1.%(zone)s. hostmaster.%(zone)s. (2022060820 300 300 300 300)
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NS ns1.%(zone)s.
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ns1 A %(ip)s
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"""
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_, ip = sys.argv
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PATH_CONFIG = "/var/bind/bind.conf"
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PATH_ZONEFILE = "/var/bind/db.%s"
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active_zones = set()
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def update_config():
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with open(PATH_CONFIG + ".part", "w") as fh:
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for zone in active_zones:
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path = PATH_ZONEFILE % zone
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fh.write("zone \"%s\" { type master; file \"%s\"; };\n" % (zone, path))
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os.rename(PATH_CONFIG + ".part", PATH_CONFIG)
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async def update_loop(v1, apps_api, api_instance, revision):
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flt = "codemowers.io", "v1alpha1", "bindzones"
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method = api_instance.list_cluster_custom_object
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w = watch.Watch()
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latest_version = None
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logger.info("Subscribing to updates")
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async for event in w.stream(method, *flt, resource_version=latest_version):
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latest_version = event["object"]["metadata"]["resourceVersion"]
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if event["type"] == "ADDED":
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zone = event["object"]["metadata"]["name"]
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active_zones.add(zone)
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path = PATH_ZONEFILE % zone
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logger.info("Adding zone: %s", zone)
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if not os.path.exists(path):
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with open(path + ".part", "w") as fh:
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fh.write(ZONEFILE_TEMPLATE % {
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"ip": ip,
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"zone": zone
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})
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os.rename(path + ".part", path)
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update_config()
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elif event["type"] == "DELETED":
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logger.info("Removing zone: %s", zone)
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active_zones.remove(zone)
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os.unlink(PATH_ZONEFILE % event["object"]["metadata"]["name"])
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async def main():
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if os.getenv("KUBECONFIG"):
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await config.load_kube_config()
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else:
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config.load_incluster_config()
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async with ApiClient() as api:
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v1 = client.CoreV1Api(api)
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apps_api = client.AppsV1Api()
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api_instance = client.CustomObjectsApi(api)
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revision = str(time())
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while True:
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try:
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await update_loop(v1, apps_api, api_instance, revision)
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except asyncio.exceptions.TimeoutError:
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pass
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if __name__ == "__main__":
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loop = asyncio.new_event_loop()
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loop.run_until_complete(main())
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loop.close()
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