bunkerweb/autoconf/src/IngressController.py
2021-07-30 17:08:54 +02:00

102 lines
3.5 KiB
Python

from kubernetes import client, config, watch
from threading import Thread, Lock
import Controller
from logger import log
class IngressController(Controller.Controller) :
def __init__(self, api_uri) :
super().__init__(Controller.Type.KUBERNETES, api_uri=api_uri, lock=Lock())
config.load_incluster_config()
self.__api = client.CoreV1Api()
self.__extensions_api = client.ExtensionsV1beta1Api()
self.__old_env = {}
def __get_ingresses(self) :
return self.__extensions_api.list_ingress_for_all_namespaces(watch=False).items
def __get_services(self) :
return self.__api.list_service_for_all_namespaces(watch=False).items
def __annotations_to_env(self, annotations, service=False) :
env = {}
prefix = ""
if service :
if not "bunkerized-nginx.SERVER_NAME" in annotations :
raise Exception("Missing bunkerized-nginx.SERVER_NAME annotation in Service.")
prefix = annotations["bunkerized-nginx.SERVER_NAME"].split(" ")[0] + "_"
for annotation in annotations :
if annotation.startswith("bunkerized-nginx.") and annotation.replace("bunkerized-nginx.", "", 1) != "" and annotation.replace("bunkerized-nginx.", "", 1) != "AUTOCONF" :
env[prefix + annotation.replace("bunkerized-nginx.", "", 1)] = annotations[annotation]
return env
def __rules_to_env(self, rules) :
env = {}
for rule in rules :
prefix = ""
if "host" in rule :
prefix = rule["host"] + "_"
if not "http" in rule or not "paths" in rule["http"] :
continue
for path in rule["http"]["paths"] :
env[prefix + "USE_REVERSE_PROXY"] = "yes"
env[prefix + "REVERSE_PROXY_URL"] = path["path"]
env[prefix + "REVERSE_PROXY_HOST"] = "http://" + path["backend"]["serviceName"] + ":" + str(path["backend"]["servicePort"])
return env
def get_env(self) :
ingresses = self.__get_ingresses()
services = self.__get_services()
env = {}
for ingress in ingresses :
if ingress.metadata.annotations == None :
continue
if "bunkerized-nginx.AUTOCONF" in ingress.metadata.annotations :
env.update(self.__annotations_to_env(ingress.metadata.annotations))
env.update(self.__rules_to_env(ingress.spec.rules))
for service in services :
if service.metadata.annotations == None :
continue
if "bunkerized-nginx.AUTOCONF" in service.metadata.annotations :
env.update(self.__annotations_to_env(service.metadata.annotations, service=True))
return self._fix_env(env)
def process_events(self, current_env) :
self.__old_env = current_env
t_ingress = Thread(target=self.__watch_ingress)
t_service = Thread(target=self.__watch_service)
t_ingress.start()
t_service.start()
t_ingress.join()
t_service.join()
def __watch_ingress(self) :
w = watch.Watch()
for event in w.stream(self.__extensions_api.list_ingress_for_all_namespaces) :
self.lock.acquire()
new_env = self.get_env()
if new_env != self.__old_env() :
if self.gen_conf(new_env, lock=False) :
self.__old_env = new_env.copy()
log("CONTROLLER", "INFO", "successfully generated new configuration")
self.lock.release()
def __watch_service(self) :
w = watch.Watch()
for event in w.stream(self.__api.list_service_for_all_namespaces) :
self.lock.acquire()
new_env = self.get_env()
if new_env != self.__old_env() :
if self.gen_conf(new_env, lock=False) :
self.__old_env = new_env.copy()
log("CONTROLLER", "INFO", "successfully generated new configuration")
self.lock.release()
def reload(self) :
return self._reload(self.__get_ingresses())
def wait(self) :
return self._config.wait(self.__get_ingresses())