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"""This module contains a Google Cloud Spanner Hook."""
from __future__ import annotations
from typing import TYPE_CHECKING, Callable, NamedTuple, Sequence
from google.api_core.exceptions import AlreadyExists, GoogleAPICallError
from google.cloud.spanner_v1.client import Client
from sqlalchemy import create_engine
from airflow.exceptions import AirflowException
from airflow.providers.common.sql.hooks.sql import DbApiHook
from airflow.providers.google.common.consts import CLIENT_INFO
from airflow.providers.google.common.hooks.base_google import GoogleBaseHook, get_field
if TYPE_CHECKING:
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
[docs]class SpannerConnectionParams(NamedTuple):
"""Information about Google Spanner connection parameters."""
[docs] instance_id: str | None
[docs] database_id: str | None
[docs]class SpannerHook(GoogleBaseHook, DbApiHook):
"""
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.
"""
[docs] conn_name_attr = "gcp_conn_id"
[docs] default_conn_name = "google_cloud_spanner_default"
[docs] conn_type = "gcpspanner"
[docs] hook_name = "Google Cloud Spanner"
def __init__(
self,
gcp_conn_id: str = "google_cloud_default",
impersonation_chain: str | Sequence[str] | None = None,
**kwargs,
) -> None:
if kwargs.get("delegate_to") is not None:
raise RuntimeError(
"The `delegate_to` parameter has been deprecated before and finally removed in this version"
" of Google Provider. You MUST convert it to `impersonate_chain`"
)
super().__init__(
gcp_conn_id=gcp_conn_id,
impersonation_chain=impersonation_chain,
)
self._client: Client | None = 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
"""
if not self._client:
self._client = Client(
project=project_id, credentials=self.get_credentials(), client_info=CLIENT_INFO
)
return self._client
def _get_conn_params(self) -> SpannerConnectionParams:
"""Extract spanner database connection parameters."""
extras = self.get_connection(self.gcp_conn_id).extra_dejson
project_id = get_field(extras, "project_id") or self.project_id
instance_id = get_field(extras, "instance_id")
database_id = get_field(extras, "database_id")
return SpannerConnectionParams(project_id, instance_id, database_id)
[docs] def get_uri(self) -> str:
"""Override DbApiHook get_uri method for get_sqlalchemy_engine()."""
project_id, instance_id, database_id = self._get_conn_params()
if not all([instance_id, database_id]):
raise AirflowException("The instance_id or database_id were not specified")
return f"spanner+spanner:///projects/{project_id}/instances/{instance_id}/databases/{database_id}"
[docs] def get_sqlalchemy_engine(self, engine_kwargs=None):
"""
Get an sqlalchemy_engine object.
:param engine_kwargs: Kwargs used in :func:`~sqlalchemy.create_engine`.
:return: the created engine.
"""
if engine_kwargs is None:
engine_kwargs = {}
project_id, _, _ = self._get_conn_params()
spanner_client = self._get_client(project_id=project_id)
return create_engine(self.get_uri(), connect_args={"client": spanner_client}, **engine_kwargs)
@GoogleBaseHook.fallback_to_default_project_id
[docs] def get_instance(
self,
instance_id: str,
project_id: str,
) -> Instance | None:
"""
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
"""
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: Operation = func(instance)
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,
) -> Database | None:
"""
Retrieves a database in Cloud Spanner; return None if the database does not exist in the instance.
: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
"""
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: Operation = database.create()
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: str | None = 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
"""
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)
