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from airflow.sensors.hdfs_sensor import HdfsSensor
[docs]class HdfsSensorRegex(HdfsSensor):
def __init__(self,
regex,
*args,
**kwargs):
super(HdfsSensorRegex, self).__init__(*args, **kwargs)
self.regex = regex
[docs] def poke(self, context):
"""
poke matching files in a directory with self.regex
:return: Bool depending on the search criteria
"""
sb = self.hook(self.hdfs_conn_id).get_conn()
self.log.info(
'Poking for {self.filepath} to be a directory '
'with files matching {self.regex.pattern}'.
format(**locals())
)
result = [f for f in sb.ls([self.filepath], include_toplevel=False) if
f['file_type'] == 'f' and
self.regex.match(f['path'].replace('%s/' % self.filepath, ''))]
result = self.filter_for_ignored_ext(result, self.ignored_ext,
self.ignore_copying)
result = self.filter_for_filesize(result, self.file_size)
return bool(result)
[docs]class HdfsSensorFolder(HdfsSensor):
def __init__(self,
be_empty=False,
*args,
**kwargs):
super(HdfsSensorFolder, self).__init__(*args, **kwargs)
self.be_empty = be_empty
[docs] def poke(self, context):
"""
poke for a non empty directory
:return: Bool depending on the search criteria
"""
sb = self.hook(self.hdfs_conn_id).get_conn()
result = [f for f in sb.ls([self.filepath], include_toplevel=True)]
result = self.filter_for_ignored_ext(result, self.ignored_ext,
self.ignore_copying)
result = self.filter_for_filesize(result, self.file_size)
if self.be_empty:
self.log.info('Poking for filepath {self.filepath} to a empty directory'
.format(**locals()))
return len(result) == 1 and result[0]['path'] == self.filepath
else:
self.log.info('Poking for filepath {self.filepath} to a non empty directory'
.format(**locals()))
result.pop(0)
return bool(result) and result[0]['file_type'] == 'f'