Source code for airflow.providers.google.cloud.transfers.adls_to_gcs

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"""
This module contains Azure Data Lake Storage to
Google Cloud Storage operator.
"""
import os
from tempfile import NamedTemporaryFile
from typing import TYPE_CHECKING, Optional, Sequence, Union

from airflow.providers.google.cloud.hooks.gcs import GCSHook, _parse_gcs_url
from airflow.providers.microsoft.azure.hooks.data_lake import AzureDataLakeHook
from airflow.providers.microsoft.azure.operators.adls import ADLSListOperator

if TYPE_CHECKING:
    from airflow.utils.context import Context


[docs]class ADLSToGCSOperator(ADLSListOperator): """ Synchronizes an Azure Data Lake Storage path with a GCS bucket :param src_adls: The Azure Data Lake path to find the objects (templated) :param dest_gcs: The Google Cloud Storage bucket and prefix to store the objects. (templated) :param replace: If true, replaces same-named files in GCS :param gzip: Option to compress file for upload :param azure_data_lake_conn_id: The connection ID to use when connecting to Azure Data Lake Storage. :param gcp_conn_id: (Optional) The connection ID used to connect to Google Cloud. :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 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). **Examples**: The following Operator would copy a single file named ``hello/world.avro`` from ADLS to the GCS bucket ``mybucket``. Its full resulting gcs path will be ``gs://mybucket/hello/world.avro`` :: copy_single_file = AdlsToGoogleCloudStorageOperator( task_id='copy_single_file', src_adls='hello/world.avro', dest_gcs='gs://mybucket', replace=False, azure_data_lake_conn_id='azure_data_lake_default', gcp_conn_id='google_cloud_default' ) The following Operator would copy all parquet files from ADLS to the GCS bucket ``mybucket``. :: copy_all_files = AdlsToGoogleCloudStorageOperator( task_id='copy_all_files', src_adls='*.parquet', dest_gcs='gs://mybucket', replace=False, azure_data_lake_conn_id='azure_data_lake_default', gcp_conn_id='google_cloud_default' ) The following Operator would copy all parquet files from ADLS path ``/hello/world``to the GCS bucket ``mybucket``. :: copy_world_files = AdlsToGoogleCloudStorageOperator( task_id='copy_world_files', src_adls='hello/world/*.parquet', dest_gcs='gs://mybucket', replace=False, azure_data_lake_conn_id='azure_data_lake_default', gcp_conn_id='google_cloud_default' ) """
[docs] template_fields: Sequence[str] = ( 'src_adls', 'dest_gcs', 'google_impersonation_chain',
)
[docs] ui_color = '#f0eee4'
def __init__( self, *, src_adls: str, dest_gcs: str, azure_data_lake_conn_id: str, gcp_conn_id: str = 'google_cloud_default', delegate_to: Optional[str] = None, replace: bool = False, gzip: bool = False, google_impersonation_chain: Optional[Union[str, Sequence[str]]] = None, **kwargs, ) -> None: super().__init__(path=src_adls, azure_data_lake_conn_id=azure_data_lake_conn_id, **kwargs) self.src_adls = src_adls self.dest_gcs = dest_gcs self.replace = replace self.gcp_conn_id = gcp_conn_id self.delegate_to = delegate_to self.gzip = gzip self.google_impersonation_chain = google_impersonation_chain
[docs] def execute(self, context: 'Context'): # use the super to list all files in an Azure Data Lake path files = super().execute(context) g_hook = GCSHook( gcp_conn_id=self.gcp_conn_id, delegate_to=self.delegate_to, impersonation_chain=self.google_impersonation_chain, ) if not self.replace: # if we are not replacing -> list all files in the ADLS path # and only keep those files which are present in # ADLS and not in Google Cloud Storage bucket_name, prefix = _parse_gcs_url(self.dest_gcs) existing_files = g_hook.list(bucket_name=bucket_name, prefix=prefix) files = list(set(files) - set(existing_files)) if files: hook = AzureDataLakeHook(azure_data_lake_conn_id=self.azure_data_lake_conn_id) for obj in files: with NamedTemporaryFile(mode='wb', delete=True) as f: hook.download_file(local_path=f.name, remote_path=obj) f.flush() dest_gcs_bucket, dest_gcs_prefix = _parse_gcs_url(self.dest_gcs) dest_path = os.path.join(dest_gcs_prefix, obj) self.log.info("Saving file to %s", dest_path) g_hook.upload( bucket_name=dest_gcs_bucket, object_name=dest_path, filename=f.name, gzip=self.gzip ) self.log.info("All done, uploaded %d files to GCS", len(files)) else: self.log.info("In sync, no files needed to be uploaded to GCS") return files

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