# -*- 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.
#
from airflow.contrib.hooks.wasb_hook import WasbHook
from airflow.sensors.base_sensor_operator import BaseSensorOperator
from airflow.utils.decorators import apply_defaults
[docs]class WasbBlobSensor(BaseSensorOperator):
"""
Waits for a blob to arrive on Azure Blob Storage.
:param container_name: Name of the container.
:type container_name: str
:param blob_name: Name of the blob.
:type blob_name: str
:param wasb_conn_id: Reference to the wasb connection.
:type wasb_conn_id: str
:param check_options: Optional keyword arguments that
`WasbHook.check_for_blob()` takes.
:type check_options: dict
"""
[docs] template_fields = ('container_name', 'blob_name')
@apply_defaults
def __init__(self, container_name, blob_name,
wasb_conn_id='wasb_default', check_options=None, *args,
**kwargs):
super(WasbBlobSensor, self).__init__(*args, **kwargs)
if check_options is None:
check_options = {}
self.wasb_conn_id = wasb_conn_id
self.container_name = container_name
self.blob_name = blob_name
self.check_options = check_options
[docs] def poke(self, context):
self.log.info(
'Poking for blob: {self.blob_name}\n'
'in wasb://{self.container_name}'.format(**locals())
)
hook = WasbHook(wasb_conn_id=self.wasb_conn_id)
return hook.check_for_blob(self.container_name, self.blob_name,
**self.check_options)
[docs]class WasbPrefixSensor(BaseSensorOperator):
"""
Waits for blobs matching a prefix to arrive on Azure Blob Storage.
:param container_name: Name of the container.
:type container_name: str
:param prefix: Prefix of the blob.
:type prefix: str
:param wasb_conn_id: Reference to the wasb connection.
:type wasb_conn_id: str
:param check_options: Optional keyword arguments that
`WasbHook.check_for_prefix()` takes.
:type check_options: dict
"""
[docs] template_fields = ('container_name', 'prefix')
@apply_defaults
def __init__(self, container_name, prefix, wasb_conn_id='wasb_default',
check_options=None, *args, **kwargs):
super(WasbPrefixSensor, self).__init__(*args, **kwargs)
if check_options is None:
check_options = {}
self.wasb_conn_id = wasb_conn_id
self.container_name = container_name
self.prefix = prefix
self.check_options = check_options
[docs] def poke(self, context):
self.log.info('Poking for prefix: %s in wasb://%s', self.prefix, self.container_name)
hook = WasbHook(wasb_conn_id=self.wasb_conn_id)
return hook.check_for_prefix(self.container_name, self.prefix,
**self.check_options)