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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: %s\nin wasb://%s', self.blob_name, self.container_name
)
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)