Source code for airflow.providers.google.cloud.hooks.spanner

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"""This module contains a Google Cloud Spanner Hook."""
from typing import Callable, List, Optional, Sequence, Union

from google.api_core.exceptions import AlreadyExists, GoogleAPICallError
from google.cloud.spanner_v1.client import Client
from google.cloud.spanner_v1.database import Database
from google.cloud.spanner_v1.instance import Instance
from google.cloud.spanner_v1.transaction import Transaction
from google.longrunning.operations_grpc_pb2 import Operation

from airflow.exceptions import AirflowException
from airflow.providers.google.common.consts import CLIENT_INFO
from airflow.providers.google.common.hooks.base_google import GoogleBaseHook


[docs]class SpannerHook(GoogleBaseHook): """ Hook for Google Cloud Spanner APIs. All the methods in the hook where project_id is used must be called with keyword arguments rather than positional. """ def __init__( self, gcp_conn_id: str = "google_cloud_default", delegate_to: Optional[str] = None, impersonation_chain: Optional[Union[str, Sequence[str]]] = None, ) -> None: super().__init__( gcp_conn_id=gcp_conn_id, delegate_to=delegate_to, impersonation_chain=impersonation_chain, ) self._client = None def _get_client(self, project_id: str) -> Client: """ Provides a client for interacting with the Cloud Spanner API. :param project_id: The ID of the Google Cloud project. :return: Client :rtype: google.cloud.spanner_v1.client.Client """ if not self._client: self._client = Client( project=project_id, credentials=self._get_credentials(), client_info=CLIENT_INFO ) return self._client @GoogleBaseHook.fallback_to_default_project_id
[docs] def get_instance( self, instance_id: str, project_id: str, ) -> Instance: """ Gets information about a particular instance. :param project_id: Optional, The ID of the Google Cloud project that owns the Cloud Spanner database. If set to None or missing, the default project_id from the Google Cloud connection is used. :param instance_id: The ID of the Cloud Spanner instance. :return: Spanner instance :rtype: google.cloud.spanner_v1.instance.Instance """ instance = self._get_client(project_id=project_id).instance(instance_id=instance_id) if not instance.exists(): return None return instance
def _apply_to_instance( self, project_id: str, instance_id: str, configuration_name: str, node_count: int, display_name: str, func: Callable[[Instance], Operation], ) -> None: """ Invokes a method on a given instance by applying a specified Callable. :param project_id: The ID of the Google Cloud project that owns the Cloud Spanner database. :param instance_id: The ID of the instance. :param configuration_name: Name of the instance configuration defining how the instance will be created. Required for instances which do not yet exist. :param node_count: (Optional) Number of nodes allocated to the instance. :param display_name: (Optional) The display name for the instance in the Cloud Console UI. (Must be between 4 and 30 characters.) If this value is not set in the constructor, will fall back to the instance ID. :param func: Method of the instance to be called. """ instance = self._get_client(project_id=project_id).instance( instance_id=instance_id, configuration_name=configuration_name, node_count=node_count, display_name=display_name, ) try: operation = func(instance) # type: Operation except GoogleAPICallError as e: self.log.error('An error occurred: %s. Exiting.', e.message) raise e if operation: result = operation.result() self.log.info(result) @GoogleBaseHook.fallback_to_default_project_id
[docs] def create_instance( self, instance_id: str, configuration_name: str, node_count: int, display_name: str, project_id: str, ) -> None: """ Creates a new Cloud Spanner instance. :param instance_id: The ID of the Cloud Spanner instance. :param configuration_name: The name of the instance configuration defining how the instance will be created. Possible configuration values can be retrieved via https://cloud.google.com/spanner/docs/reference/rest/v1/projects.instanceConfigs/list :param node_count: (Optional) The number of nodes allocated to the Cloud Spanner instance. :param display_name: (Optional) The display name for the instance in the Google Cloud Console. Must be between 4 and 30 characters. If this value is not passed, the name falls back to the instance ID. :param project_id: Optional, the ID of the Google Cloud project that owns the Cloud Spanner database. If set to None or missing, the default project_id from the Google Cloud connection is used. :return: None """ self._apply_to_instance( project_id, instance_id, configuration_name, node_count, display_name, lambda x: x.create()
) @GoogleBaseHook.fallback_to_default_project_id
[docs] def update_instance( self, instance_id: str, configuration_name: str, node_count: int, display_name: str, project_id: str, ) -> None: """ Updates an existing Cloud Spanner instance. :param instance_id: The ID of the Cloud Spanner instance. :param configuration_name: The name of the instance configuration defining how the instance will be created. Possible configuration values can be retrieved via https://cloud.google.com/spanner/docs/reference/rest/v1/projects.instanceConfigs/list :param node_count: (Optional) The number of nodes allocated to the Cloud Spanner instance. :param display_name: (Optional) The display name for the instance in the Google Cloud Console. Must be between 4 and 30 characters. If this value is not set in the constructor, the name falls back to the instance ID. :param project_id: Optional, the ID of the Google Cloud project that owns the Cloud Spanner database. If set to None or missing, the default project_id from the Google Cloud connection is used. :return: None """ self._apply_to_instance( project_id, instance_id, configuration_name, node_count, display_name, lambda x: x.update()
) @GoogleBaseHook.fallback_to_default_project_id
[docs] def delete_instance(self, instance_id: str, project_id: str) -> None: """ Deletes an existing Cloud Spanner instance. :param instance_id: The ID of the Cloud Spanner instance. :param project_id: Optional, the ID of the Google Cloud project that owns the Cloud Spanner database. If set to None or missing, the default project_id from the Google Cloud connection is used. :return: None """ instance = self._get_client(project_id=project_id).instance(instance_id) try: instance.delete() return except GoogleAPICallError as e: self.log.error('An error occurred: %s. Exiting.', e.message) raise e
@GoogleBaseHook.fallback_to_default_project_id
[docs] def get_database( self, instance_id: str, database_id: str, project_id: str, ) -> Optional[Database]: """ Retrieves a database in Cloud Spanner. If the database does not exist in the specified instance, it returns None. :param instance_id: The ID of the Cloud Spanner instance. :param database_id: The ID of the database in Cloud Spanner. :param project_id: Optional, the ID of the Google Cloud project that owns the Cloud Spanner database. If set to None or missing, the default project_id from the Google Cloud connection is used. :return: Database object or None if database does not exist :rtype: google.cloud.spanner_v1.database.Database or None """ instance = self._get_client(project_id=project_id).instance(instance_id=instance_id) if not instance.exists(): raise AirflowException(f"The instance {instance_id} does not exist in project {project_id} !") database = instance.database(database_id=database_id) if not database.exists(): return None return database
@GoogleBaseHook.fallback_to_default_project_id
[docs] def create_database( self, instance_id: str, database_id: str, ddl_statements: List[str], project_id: str, ) -> None: """ Creates a new database in Cloud Spanner. :param instance_id: The ID of the Cloud Spanner instance. :param database_id: The ID of the database to create in Cloud Spanner. :param ddl_statements: The string list containing DDL for the new database. :param project_id: Optional, the ID of the Google Cloud project that owns the Cloud Spanner database. If set to None or missing, the default project_id from the Google Cloud connection is used. :return: None """ instance = self._get_client(project_id=project_id).instance(instance_id=instance_id) if not instance.exists(): raise AirflowException(f"The instance {instance_id} does not exist in project {project_id} !") database = instance.database(database_id=database_id, ddl_statements=ddl_statements) try: operation = database.create() # type: Operation except GoogleAPICallError as e: self.log.error('An error occurred: %s. Exiting.', e.message) raise e if operation: result = operation.result() self.log.info(result)
@GoogleBaseHook.fallback_to_default_project_id
[docs] def update_database( self, instance_id: str, database_id: str, ddl_statements: List[str], project_id: str, operation_id: Optional[str] = None, ) -> None: """ Updates DDL of a database in Cloud Spanner. :param instance_id: The ID of the Cloud Spanner instance. :param database_id: The ID of the database in Cloud Spanner. :param ddl_statements: The string list containing DDL for the new database. :param project_id: Optional, the ID of the Google Cloud project that owns the Cloud Spanner database. If set to None or missing, the default project_id from the Google Cloud connection is used. :param operation_id: (Optional) The unique per database operation ID that can be specified to implement idempotency check. :return: None """ instance = self._get_client(project_id=project_id).instance(instance_id=instance_id) if not instance.exists(): raise AirflowException(f"The instance {instance_id} does not exist in project {project_id} !") database = instance.database(database_id=database_id) try: operation = database.update_ddl(ddl_statements=ddl_statements, operation_id=operation_id) if operation: result = operation.result() self.log.info(result) return except AlreadyExists as e: if e.code == 409 and operation_id in e.message: self.log.info( "Replayed update_ddl message - the operation id %s was already done before.", operation_id, ) return except GoogleAPICallError as e: self.log.error('An error occurred: %s. Exiting.', e.message) raise e
@GoogleBaseHook.fallback_to_default_project_id
[docs] def delete_database(self, instance_id: str, database_id, project_id: str) -> bool: """ Drops a database in Cloud Spanner. :param instance_id: The ID of the Cloud Spanner instance. :param database_id: The ID of the database in Cloud Spanner. :param project_id: Optional, the ID of the Google Cloud project that owns the Cloud Spanner database. If set to None or missing, the default project_id from the Google Cloud connection is used. :return: True if everything succeeded :rtype: bool """ instance = self._get_client(project_id=project_id).instance(instance_id=instance_id) if not instance.exists(): raise AirflowException(f"The instance {instance_id} does not exist in project {project_id} !") database = instance.database(database_id=database_id) if not database.exists(): self.log.info( "The database %s is already deleted from instance %s. Exiting.", database_id, instance_id ) return False try: database.drop() except GoogleAPICallError as e: self.log.error('An error occurred: %s. Exiting.', e.message) raise e return True
@GoogleBaseHook.fallback_to_default_project_id
[docs] def execute_dml( self, instance_id: str, database_id: str, queries: List[str], project_id: str, ) -> None: """ Executes an arbitrary DML query (INSERT, UPDATE, DELETE). :param instance_id: The ID of the Cloud Spanner instance. :param database_id: The ID of the database in Cloud Spanner. :param queries: The queries to execute. :param project_id: Optional, the ID of the Google Cloud project that owns the Cloud Spanner database. If set to None or missing, the default project_id from the Google Cloud connection is used. """ self._get_client(project_id=project_id).instance(instance_id=instance_id).database( database_id=database_id ).run_in_transaction(lambda transaction: self._execute_sql_in_transaction(transaction, queries))
@staticmethod def _execute_sql_in_transaction(transaction: Transaction, queries: List[str]): for sql in queries: transaction.execute_update(sql)

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