airflow listener 源码
airflow listener 代码
文件路径：/airflow/listeners/listener.py
#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you 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.
from __future__ import annotations
import logging
from types import ModuleType
from typing import TYPE_CHECKING
import pluggy
from airflow.plugins_manager import integrate_listener_plugins
if TYPE_CHECKING:
from pluggy._hooks import _HookRelay
log = logging.getLogger(__name__)
_listener_manager = None
class ListenerManager:
"""Class that manages registration of listeners and provides hook property for calling them"""
def __init__(self):
from airflow.listeners import spec
self.pm = pluggy.PluginManager("airflow")
self.pm.add_hookspecs(spec)
@property
def has_listeners(self) -> bool:
return len(self.pm.get_plugins()) > 0
@property
def hook(self) -> _HookRelay:
"""Returns hook, on which plugin methods specified in spec can be called."""
return self.pm.hook
def add_listener(self, listener):
if not isinstance(listener, ModuleType):
raise TypeError("Listener %s is not module", str(listener))
if self.pm.is_registered(listener):
return
self.pm.register(listener)
def clear(self):
"""Remove registered plugins"""
for plugin in self.pm.get_plugins():
self.pm.unregister(plugin)
def get_listener_manager() -> ListenerManager:
global _listener_manager
if not _listener_manager:
_listener_manager = ListenerManager()
integrate_listener_plugins(_listener_manager)
return _listener_manager
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