Source code for airflow.contrib.operators.datastore_export_operator

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from airflow.contrib.hooks.datastore_hook import DatastoreHook
from airflow.contrib.hooks.gcs_hook import GoogleCloudStorageHook
from airflow.exceptions import AirflowException
from airflow.models import BaseOperator
from airflow.utils.decorators import apply_defaults

[docs]class DatastoreExportOperator(BaseOperator): """ Export entities from Google Cloud Datastore to Cloud Storage :param bucket: name of the cloud storage bucket to backup data :type bucket: str :param namespace: optional namespace path in the specified Cloud Storage bucket to backup data. If this namespace does not exist in GCS, it will be created. :type namespace: str :param datastore_conn_id: the name of the Datastore connection id to use :type datastore_conn_id: str :param cloud_storage_conn_id: the name of the cloud storage connection id to force-write backup :type 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 entity_filter: description of what data from the project is included in the export, refer to :type entity_filter: dict :param labels: client-assigned labels for cloud storage :type labels: dict :param polling_interval_in_seconds: number of seconds to wait before polling for execution status again :type polling_interval_in_seconds: int :param overwrite_existing: if the storage bucket + namespace is not empty, it will be emptied prior to exports. This enables overwriting existing backups. :type overwrite_existing: bool :param xcom_push: push operation name to xcom for reference :type xcom_push: bool """ @apply_defaults def __init__(self, bucket, namespace=None, datastore_conn_id='google_cloud_default', cloud_storage_conn_id='google_cloud_default', delegate_to=None, entity_filter=None, labels=None, polling_interval_in_seconds=10, overwrite_existing=False, xcom_push=False, *args, **kwargs): super(DatastoreExportOperator, self).__init__(*args, **kwargs) self.datastore_conn_id = datastore_conn_id self.cloud_storage_conn_id = cloud_storage_conn_id self.delegate_to = delegate_to self.bucket = bucket self.namespace = namespace self.entity_filter = entity_filter self.labels = labels self.polling_interval_in_seconds = polling_interval_in_seconds self.overwrite_existing = overwrite_existing self.xcom_push = xcom_push
[docs] def execute(self, context):'Exporting data to Cloud Storage bucket ' + self.bucket) if self.overwrite_existing and self.namespace: gcs_hook = GoogleCloudStorageHook(self.cloud_storage_conn_id) objects = gcs_hook.list(self.bucket, prefix=self.namespace) for o in objects: gcs_hook.delete(self.bucket, o) ds_hook = DatastoreHook(self.datastore_conn_id, self.delegate_to) result = ds_hook.export_to_storage_bucket(bucket=self.bucket, namespace=self.namespace, entity_filter=self.entity_filter, labels=self.labels) operation_name = result['name'] result = ds_hook.poll_operation_until_done(operation_name, self.polling_interval_in_seconds) state = result['metadata']['common']['state'] if state != 'SUCCESSFUL': raise AirflowException('Operation failed: result={}'.format(result)) if self.xcom_push: return result

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