# -*- coding: utf-8 -*-
#
# 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.
#
import os
import stat
from airflow.contrib.hooks.fs_hook import FSHook
from airflow.sensors.base_sensor_operator import BaseSensorOperator
from airflow.utils.decorators import apply_defaults
[docs]class FileSensor(BaseSensorOperator):
"""
Waits for a file or folder to land in a filesystem.
If the path given is a directory then this sensor will only return true if
any files exist inside it (either directly, or within a subdirectory)
:param fs_conn_id: reference to the File (path)
connection id
:type fs_conn_id: string
:param filepath: File or folder name (relative to
the base path set within the connection)
:type fs_conn_id: string
"""
template_fields = ('filepath',)
ui_color = '#91818a'
@apply_defaults
def __init__(self,
filepath,
fs_conn_id='fs_default2',
*args,
**kwargs):
super(FileSensor, self).__init__(*args, **kwargs)
self.filepath = filepath
self.fs_conn_id = fs_conn_id
[docs] def poke(self, context):
hook = FSHook(self.fs_conn_id)
basepath = hook.get_path()
full_path = "/".join([basepath, self.filepath])
self.log.info('Poking for file {full_path}'.format(**locals()))
try:
if stat.S_ISDIR(os.stat(full_path).st_mode):
for root, dirs, files in os.walk(full_path):
if len(files):
return True
else:
# full_path was a file directly
return True
except OSError:
return False
return False