Source code for airflow.contrib.sensors.hdfs_sensor

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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'