Source code for airflow.contrib.operators.s3_list_operator

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from typing import Iterable

from airflow.hooks.S3_hook import S3Hook
from airflow.models import BaseOperator
from airflow.utils.decorators import apply_defaults


[docs]class S3ListOperator(BaseOperator): """ List all objects from the bucket with the given string prefix in name. This operator returns a python list with the name of objects which can be used by `xcom` in the downstream task. :param bucket: The S3 bucket where to find the objects. (templated) :type bucket: str :param prefix: Prefix string to filters the objects whose name begin with such prefix. (templated) :type prefix: str :param delimiter: the delimiter marks key hierarchy. (templated) :type delimiter: str :param aws_conn_id: The connection ID to use when connecting to S3 storage. :type aws_conn_id: str :param verify: Whether or not to verify SSL certificates for S3 connection. By default SSL certificates are verified. You can provide the following values: - ``False``: do not validate SSL certificates. SSL will still be used (unless use_ssl is False), but SSL certificates will not be verified. - ``path/to/cert/bundle.pem``: A filename of the CA cert bundle to uses. You can specify this argument if you want to use a different CA cert bundle than the one used by botocore. :type verify: bool or str **Example**: The following operator would list all the files (excluding subfolders) from the S3 ``customers/2018/04/`` key in the ``data`` bucket. :: s3_file = S3ListOperator( task_id='list_3s_files', bucket='data', prefix='customers/2018/04/', delimiter='/', aws_conn_id='aws_customers_conn' ) """ template_fields = ('bucket', 'prefix', 'delimiter') # type: Iterable[str] ui_color = '#ffd700' @apply_defaults def __init__(self, bucket, prefix='', delimiter='', aws_conn_id='aws_default', verify=None, *args, **kwargs): super(S3ListOperator, self).__init__(*args, **kwargs) self.bucket = bucket self.prefix = prefix self.delimiter = delimiter self.aws_conn_id = aws_conn_id self.verify = verify def execute(self, context): hook = S3Hook(aws_conn_id=self.aws_conn_id, verify=self.verify) self.log.info( 'Getting the list of files from bucket: %s in prefix: %s (Delimiter {%s)', self.bucket, self.prefix, self.delimiter ) return hook.list_keys( bucket_name=self.bucket, prefix=self.prefix, delimiter=self.delimiter)