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"""This module contains Google Datastore hook."""
import time
import warnings
from typing import Any, Dict, Optional, Sequence, Union
from googleapiclient.discovery import Resource, build
from airflow.providers.google.common.hooks.base_google import GoogleBaseHook
[docs]class DatastoreHook(GoogleBaseHook):
"""
Interact with Google Cloud Datastore. This hook uses the Google Cloud connection.
This object is not threads safe. If you want to make multiple requests
simultaneously, you will need to create a hook per thread.
:param api_version: The version of the API it is going to connect to.
"""
def __init__(
self,
gcp_conn_id: str = "google_cloud_default",
delegate_to: Optional[str] = None,
api_version: str = 'v1',
datastore_conn_id: Optional[str] = None,
impersonation_chain: Optional[Union[str, Sequence[str]]] = None,
) -> None:
if datastore_conn_id:
warnings.warn(
"The datastore_conn_id parameter has been deprecated. You should pass "
"the gcp_conn_id parameter.",
DeprecationWarning,
stacklevel=2,
)
gcp_conn_id = datastore_conn_id
super().__init__(
gcp_conn_id=gcp_conn_id,
delegate_to=delegate_to,
impersonation_chain=impersonation_chain,
)
self.connection = None
self.api_version = api_version
[docs] def get_conn(self) -> Resource:
"""
Establishes a connection to the Google API.
:return: a Google Cloud Datastore service object.
:rtype: Resource
"""
if not self.connection:
http_authorized = self._authorize()
self.connection = build(
'datastore', self.api_version, http=http_authorized, cache_discovery=False
)
return self.connection
@GoogleBaseHook.fallback_to_default_project_id
[docs] def allocate_ids(self, partial_keys: list, project_id: str) -> list:
"""
Allocate IDs for incomplete keys.
.. seealso::
https://cloud.google.com/datastore/docs/reference/rest/v1/projects/allocateIds
:param partial_keys: a list of partial keys.
:param project_id: Google Cloud project ID against which to make the request.
:return: a list of full keys.
:rtype: list
"""
conn = self.get_conn() # type: Any
resp = (
conn.projects()
.allocateIds(projectId=project_id, body={'keys': partial_keys})
.execute(num_retries=self.num_retries)
)
return resp['keys']
@GoogleBaseHook.fallback_to_default_project_id
[docs] def begin_transaction(self, project_id: str, transaction_options: Dict[str, Any]) -> str:
"""
Begins a new transaction.
.. seealso::
https://cloud.google.com/datastore/docs/reference/rest/v1/projects/beginTransaction
:param project_id: Google Cloud project ID against which to make the request.
:param transaction_options: Options for a new transaction.
:return: a transaction handle.
:rtype: str
"""
conn = self.get_conn() # type: Any
resp = (
conn.projects()
.beginTransaction(projectId=project_id, body={"transactionOptions": transaction_options})
.execute(num_retries=self.num_retries)
)
return resp['transaction']
@GoogleBaseHook.fallback_to_default_project_id
[docs] def commit(self, body: dict, project_id: str) -> dict:
"""
Commit a transaction, optionally creating, deleting or modifying some entities.
.. seealso::
https://cloud.google.com/datastore/docs/reference/rest/v1/projects/commit
:param body: the body of the commit request.
:param project_id: Google Cloud project ID against which to make the request.
:return: the response body of the commit request.
:rtype: dict
"""
conn = self.get_conn() # type: Any
resp = conn.projects().commit(projectId=project_id, body=body).execute(num_retries=self.num_retries)
return resp
@GoogleBaseHook.fallback_to_default_project_id
[docs] def lookup(
self,
keys: list,
project_id: str,
read_consistency: Optional[str] = None,
transaction: Optional[str] = None,
) -> dict:
"""
Lookup some entities by key.
.. seealso::
https://cloud.google.com/datastore/docs/reference/rest/v1/projects/lookup
:param keys: the keys to lookup.
:param read_consistency: the read consistency to use. default, strong or eventual.
Cannot be used with a transaction.
:param transaction: the transaction to use, if any.
:param project_id: Google Cloud project ID against which to make the request.
:return: the response body of the lookup request.
:rtype: dict
"""
conn = self.get_conn() # type: Any
body = {'keys': keys} # type: Dict[str, Any]
if read_consistency:
body['readConsistency'] = read_consistency
if transaction:
body['transaction'] = transaction
resp = conn.projects().lookup(projectId=project_id, body=body).execute(num_retries=self.num_retries)
return resp
@GoogleBaseHook.fallback_to_default_project_id
[docs] def rollback(self, transaction: str, project_id: str) -> None:
"""
Roll back a transaction.
.. seealso::
https://cloud.google.com/datastore/docs/reference/rest/v1/projects/rollback
:param transaction: the transaction to roll back.
:param project_id: Google Cloud project ID against which to make the request.
"""
conn: Any = self.get_conn()
conn.projects().rollback(projectId=project_id, body={'transaction': transaction}).execute(
num_retries=self.num_retries
)
@GoogleBaseHook.fallback_to_default_project_id
[docs] def run_query(self, body: dict, project_id: str) -> dict:
"""
Run a query for entities.
.. seealso::
https://cloud.google.com/datastore/docs/reference/rest/v1/projects/runQuery
:param body: the body of the query request.
:param project_id: Google Cloud project ID against which to make the request.
:return: the batch of query results.
:rtype: dict
"""
conn = self.get_conn() # type: Any
resp = conn.projects().runQuery(projectId=project_id, body=body).execute(num_retries=self.num_retries)
return resp['batch']
[docs] def get_operation(self, name: str) -> dict:
"""
Gets the latest state of a long-running operation.
.. seealso::
https://cloud.google.com/datastore/docs/reference/data/rest/v1/projects.operations/get
:param name: the name of the operation resource.
:return: a resource operation instance.
:rtype: dict
"""
conn: Any = self.get_conn()
resp = conn.projects().operations().get(name=name).execute(num_retries=self.num_retries)
return resp
[docs] def delete_operation(self, name: str) -> dict:
"""
Deletes the long-running operation.
.. seealso::
https://cloud.google.com/datastore/docs/reference/data/rest/v1/projects.operations/delete
:param name: the name of the operation resource.
:return: none if successful.
:rtype: dict
"""
conn = self.get_conn() # type: Any
resp = conn.projects().operations().delete(name=name).execute(num_retries=self.num_retries)
return resp
[docs] def poll_operation_until_done(self, name: str, polling_interval_in_seconds: float) -> Dict:
"""
Poll backup operation state until it's completed.
:param name: the name of the operation resource
:param polling_interval_in_seconds: The number of seconds to wait before calling another request.
:return: a resource operation instance.
:rtype: dict
"""
while True:
result: Dict = self.get_operation(name)
state: str = result['metadata']['common']['state']
if state == 'PROCESSING':
self.log.info(
'Operation is processing. Re-polling state in %s seconds', polling_interval_in_seconds
)
time.sleep(polling_interval_in_seconds)
else:
return result
@GoogleBaseHook.fallback_to_default_project_id
[docs] def export_to_storage_bucket(
self,
bucket: str,
project_id: str,
namespace: Optional[str] = None,
entity_filter: Optional[dict] = None,
labels: Optional[Dict[str, str]] = None,
) -> dict:
"""
Export entities from Cloud Datastore to Cloud Storage for backup.
.. note::
Keep in mind that this requests the Admin API not the Data API.
.. seealso::
https://cloud.google.com/datastore/docs/reference/admin/rest/v1/projects/export
:param bucket: The name of the Cloud Storage bucket.
:param namespace: The Cloud Storage namespace path.
:param entity_filter: Description of what data from the project is included in the export.
:param labels: Client-assigned labels.
:param project_id: Google Cloud project ID against which to make the request.
:return: a resource operation instance.
:rtype: dict
"""
admin_conn = self.get_conn() # type: Any
output_uri_prefix = 'gs://' + '/'.join(filter(None, [bucket, namespace])) # type: str
if not entity_filter:
entity_filter = {}
if not labels:
labels = {}
body = {
'outputUrlPrefix': output_uri_prefix,
'entityFilter': entity_filter,
'labels': labels,
} # type: Dict
resp = (
admin_conn.projects()
.export(projectId=project_id, body=body)
.execute(num_retries=self.num_retries)
)
return resp
@GoogleBaseHook.fallback_to_default_project_id
[docs] def import_from_storage_bucket(
self,
bucket: str,
file: str,
project_id: str,
namespace: Optional[str] = None,
entity_filter: Optional[dict] = None,
labels: Optional[Union[dict, str]] = None,
) -> dict:
"""
Import a backup from Cloud Storage to Cloud Datastore.
.. note::
Keep in mind that this requests the Admin API not the Data API.
.. seealso::
https://cloud.google.com/datastore/docs/reference/admin/rest/v1/projects/import
:param bucket: The name of the Cloud Storage bucket.
:param file: the metadata file written by the projects.export operation.
:param namespace: The Cloud Storage namespace path.
:param entity_filter: specify which kinds/namespaces are to be imported.
:param labels: Client-assigned labels.
:param project_id: Google Cloud project ID against which to make the request.
:return: a resource operation instance.
:rtype: dict
"""
admin_conn = self.get_conn() # type: Any
input_url = 'gs://' + '/'.join(filter(None, [bucket, namespace, file])) # type: str
if not entity_filter:
entity_filter = {}
if not labels:
labels = {}
body = {
'inputUrl': input_url,
'entityFilter': entity_filter,
'labels': labels,
} # type: Dict
resp = (
admin_conn.projects()
.import_(projectId=project_id, body=body)
.execute(num_retries=self.num_retries)
)
return resp