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# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
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#
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# software distributed under the License is distributed on an
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# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
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from __future__ import annotations
from tempfile import NamedTemporaryFile
from typing import TYPE_CHECKING, Sequence
from airflow import AirflowException
from airflow.models import BaseOperator
from airflow.providers.google.cloud.hooks.gcs import GCSHook, _parse_gcs_url, gcs_object_is_directory
from airflow.providers.microsoft.azure.hooks.fileshare import AzureFileShareHook
if TYPE_CHECKING:
from airflow.utils.context import Context
[docs]class AzureFileShareToGCSOperator(BaseOperator):
"""
Synchronizes a Azure FileShare directory content (excluding subdirectories),
possibly filtered by a prefix, with a Google Cloud Storage destination path.
:param share_name: The Azure FileShare share where to find the objects. (templated)
:param directory_name: (Optional) Path to Azure FileShare directory which content is to be transferred.
Defaults to root directory (templated)
:param prefix: Prefix string which filters objects whose name begin with
such prefix. (templated)
:param azure_fileshare_conn_id: The source WASB connection
:param gcp_conn_id: (Optional) The connection ID used to connect to Google Cloud.
:param dest_gcs: The destination Google Cloud Storage bucket and prefix
where you want to store the files. (templated)
:param delegate_to: Google account to impersonate using domain-wide delegation of authority,
if any. For this to work, the service account making the request must have
domain-wide delegation enabled.
:param replace: Whether you want to replace existing destination files
or not.
:param gzip: Option to compress file for upload
:param google_impersonation_chain: Optional Google service account to impersonate using
short-term credentials, or chained list of accounts required to get the access_token
of the last account in the list, which will be impersonated in the request.
If set as a string, the account must grant the originating account
the Service Account Token Creator IAM role.
If set as a sequence, the identities from the list must grant
Service Account Token Creator IAM role to the directly preceding identity, with first
account from the list granting this role to the originating account (templated).
Note that ``share_name``, ``directory_name``, ``prefix``, ``delimiter`` and ``dest_gcs`` are
templated, so you can use variables in them if you wish.
"""
[docs] template_fields: Sequence[str] = (
"share_name",
"directory_name",
"prefix",
"dest_gcs",
)
def __init__(
self,
*,
share_name: str,
dest_gcs: str,
directory_name: str | None = None,
prefix: str = "",
azure_fileshare_conn_id: str = "azure_fileshare_default",
gcp_conn_id: str = "google_cloud_default",
delegate_to: str | None = None,
replace: bool = False,
gzip: bool = False,
google_impersonation_chain: str | Sequence[str] | None = None,
**kwargs,
):
super().__init__(**kwargs)
self.share_name = share_name
self.directory_name = directory_name
self.prefix = prefix
self.azure_fileshare_conn_id = azure_fileshare_conn_id
self.gcp_conn_id = gcp_conn_id
self.dest_gcs = dest_gcs
self.delegate_to = delegate_to
self.replace = replace
self.gzip = gzip
self.google_impersonation_chain = google_impersonation_chain
def _check_inputs(self) -> None:
if self.dest_gcs and not gcs_object_is_directory(self.dest_gcs):
self.log.info(
"Destination Google Cloud Storage path is not a valid "
'"directory", define a path that ends with a slash "/" or '
"leave it empty for the root of the bucket."
)
raise AirflowException(
'The destination Google Cloud Storage path must end with a slash "/" or be empty.'
)
[docs] def execute(self, context: Context):
self._check_inputs()
azure_fileshare_hook = AzureFileShareHook(self.azure_fileshare_conn_id)
files = azure_fileshare_hook.list_files(
share_name=self.share_name, directory_name=self.directory_name
)
gcs_hook = GCSHook(
gcp_conn_id=self.gcp_conn_id,
delegate_to=self.delegate_to,
impersonation_chain=self.google_impersonation_chain,
)
dest_gcs_bucket, dest_gcs_object_prefix = _parse_gcs_url(self.dest_gcs)
if not self.replace:
# if we are not replacing -> list all files in the GCS bucket
# and only keep those files which are present in
# S3 and not in Google Cloud Storage
existing_files_prefixed = gcs_hook.list(dest_gcs_bucket, prefix=dest_gcs_object_prefix)
existing_files = []
# Remove the object prefix itself, an empty directory was found
if dest_gcs_object_prefix in existing_files_prefixed:
existing_files_prefixed.remove(dest_gcs_object_prefix)
# Remove the object prefix from all object string paths
for file in existing_files_prefixed:
if file.startswith(dest_gcs_object_prefix):
existing_files.append(file[len(dest_gcs_object_prefix) :])
else:
existing_files.append(file)
files = list(set(files) - set(existing_files))
if files:
self.log.info("%s files are going to be synced.", len(files))
if self.directory_name is None:
raise RuntimeError("The directory_name must be set!.")
for file in files:
with NamedTemporaryFile() as temp_file:
azure_fileshare_hook.get_file_to_stream(
stream=temp_file,
share_name=self.share_name,
directory_name=self.directory_name,
file_name=file,
)
temp_file.flush()
# There will always be a '/' before file because it is
# enforced at instantiation time
dest_gcs_object = dest_gcs_object_prefix + file
gcs_hook.upload(dest_gcs_bucket, dest_gcs_object, temp_file.name, gzip=self.gzip)
self.log.info("All done, uploaded %d files to Google Cloud Storage.", len(files))
else:
self.log.info("There are no new files to sync. Have a nice day!")
self.log.info("In sync, no files needed to be uploaded to Google Cloud Storage")
return files
