airflow web_hdfs 源码
airflow web_hdfs 代码
文件路径：/airflow/providers/apache/hdfs/sensors/web_hdfs.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
from typing import TYPE_CHECKING, Any, Sequence
from airflow.sensors.base import BaseSensorOperator
if TYPE_CHECKING:
from airflow.utils.context import Context
class WebHdfsSensor(BaseSensorOperator):
"""Waits for a file or folder to land in HDFS"""
template_fields: Sequence[str] = ('filepath',)
def __init__(self, *, filepath: str, webhdfs_conn_id: str = 'webhdfs_default', **kwargs: Any) -> None:
super().__init__(**kwargs)
self.filepath = filepath
self.webhdfs_conn_id = webhdfs_conn_id
def poke(self, context: Context) -> bool:
from airflow.providers.apache.hdfs.hooks.webhdfs import WebHDFSHook
hook = WebHDFSHook(self.webhdfs_conn_id)
self.log.info('Poking for file %s', self.filepath)
return hook.check_for_path(hdfs_path=self.filepath)
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