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from airflow.contrib.hooks.gcs_hook import GoogleCloudStorageHook
from airflow.contrib.operators.gcs_list_operator import GoogleCloudStorageListOperator
from airflow.utils.decorators import apply_defaults
from airflow.hooks.S3_hook import S3Hook
[docs]class GoogleCloudStorageToS3Operator(GoogleCloudStorageListOperator):
"""
Synchronizes a Google Cloud Storage bucket with an S3 bucket.
:param bucket: The Google Cloud Storage bucket to find the objects. (templated)
:type bucket: str
:param prefix: Prefix string which filters objects whose name begin with
this prefix. (templated)
:type prefix: str
:param delimiter: The delimiter by which you want to filter the objects. (templated)
For e.g to lists the CSV files from in a directory in GCS you would use
delimiter='.csv'.
:type delimiter: str
:param google_cloud_storage_conn_id: The connection ID to use when
connecting to Google Cloud Storage.
:type google_cloud_storage_conn_id: str
:param delegate_to: The account to impersonate, if any.
For this to work, the service account making the request must have
domain-wide delegation enabled.
:type delegate_to: str
:param dest_aws_conn_id: The destination S3 connection
:type dest_aws_conn_id: str
:param dest_s3_key: The base S3 key to be used to store the files. (templated)
:type dest_s3_key: str
:param dest_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 dest_verify: bool or str
"""
[docs] template_fields = ('bucket', 'prefix', 'delimiter', 'dest_s3_key')
@apply_defaults
def __init__(self,
bucket,
prefix=None,
delimiter=None,
google_cloud_storage_conn_id='google_cloud_storage_default',
delegate_to=None,
dest_aws_conn_id=None,
dest_s3_key=None,
dest_verify=None,
replace=False,
*args,
**kwargs):
super(GoogleCloudStorageToS3Operator, self).__init__(
bucket=bucket,
prefix=prefix,
delimiter=delimiter,
google_cloud_storage_conn_id=google_cloud_storage_conn_id,
delegate_to=delegate_to,
*args,
**kwargs
)
self.dest_aws_conn_id = dest_aws_conn_id
self.dest_s3_key = dest_s3_key
self.dest_verify = dest_verify
self.replace = replace
[docs] def execute(self, context):
# use the super to list all files in an Google Cloud Storage bucket
files = super(GoogleCloudStorageToS3Operator, self).execute(context)
s3_hook = S3Hook(aws_conn_id=self.dest_aws_conn_id, verify=self.dest_verify)
if not self.replace:
# if we are not replacing -> list all files in the S3 bucket
# and only keep those files which are present in
# Google Cloud Storage and not in S3
bucket_name, _ = S3Hook.parse_s3_url(self.dest_s3_key)
existing_files = s3_hook.list_keys(bucket_name)
files = list(set(files) - set(existing_files))
if files:
hook = GoogleCloudStorageHook(
google_cloud_storage_conn_id=self.google_cloud_storage_conn_id,
delegate_to=self.delegate_to
)
for file in files:
file_bytes = hook.download(self.bucket, file)
dest_key = self.dest_s3_key + file
self.log.info("Saving file to %s", dest_key)
s3_hook.load_bytes(file_bytes,
key=dest_key,
replace=self.replace)
self.log.info("All done, uploaded %d files to S3", len(files))
else:
self.log.info("In sync, no files needed to be uploaded to S3")
return files