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"""
Example Airflow DAG that creates, updates, queries and deletes a Cloud Spanner instance.
"""
from __future__ import annotations
import os
from datetime import datetime
from airflow.models.dag import DAG
from airflow.providers.google.cloud.operators.spanner import (
SpannerDeleteDatabaseInstanceOperator,
SpannerDeleteInstanceOperator,
SpannerDeployDatabaseInstanceOperator,
SpannerDeployInstanceOperator,
SpannerQueryDatabaseInstanceOperator,
SpannerUpdateDatabaseInstanceOperator,
)
try:
from airflow.sdk import TriggerRule
except ImportError:
# Compatibility for Airflow < 3.1
from airflow.utils.trigger_rule import TriggerRule # type: ignore[no-redef,attr-defined]
from system.google import DEFAULT_GCP_SYSTEM_TEST_PROJECT_ID
ENV_ID = os.environ.get("SYSTEM_TESTS_ENV_ID", "default")
PROJECT_ID = os.environ.get("SYSTEM_TESTS_GCP_PROJECT") or DEFAULT_GCP_SYSTEM_TEST_PROJECT_ID
DAG_ID = "spanner"
GCP_SPANNER_INSTANCE_ID = f"instance-{DAG_ID}-{ENV_ID}"
GCP_SPANNER_DATABASE_ID = f"database-{DAG_ID}-{ENV_ID}"
GCP_SPANNER_CONFIG_NAME = f"projects/{PROJECT_ID}/instanceConfigs/regional-europe-west3"
GCP_SPANNER_NODE_COUNT = 1
GCP_SPANNER_DISPLAY_NAME = "InstanceSpanner"
# OPERATION_ID should be unique per operation
OPERATION_ID = "unique_operation_id"
with DAG(
DAG_ID,
schedule="@once", # Override to match your needs
start_date=datetime(2021, 1, 1),
catchup=False,
tags=["example", "spanner"],
) as dag:
# Create
# [START howto_operator_spanner_deploy]
spanner_instance_create_task = SpannerDeployInstanceOperator(
project_id=PROJECT_ID,
instance_id=GCP_SPANNER_INSTANCE_ID,
configuration_name=GCP_SPANNER_CONFIG_NAME,
node_count=GCP_SPANNER_NODE_COUNT,
display_name=GCP_SPANNER_DISPLAY_NAME,
task_id="spanner_instance_create_task",
)
spanner_instance_update_task = SpannerDeployInstanceOperator(
instance_id=GCP_SPANNER_INSTANCE_ID,
configuration_name=GCP_SPANNER_CONFIG_NAME,
node_count=GCP_SPANNER_NODE_COUNT + 1,
display_name=GCP_SPANNER_DISPLAY_NAME + "_updated",
task_id="spanner_instance_update_task",
)
# [END howto_operator_spanner_deploy]
# [START howto_operator_spanner_database_deploy]
spanner_database_deploy_task = SpannerDeployDatabaseInstanceOperator(
instance_id=GCP_SPANNER_INSTANCE_ID,
database_id=GCP_SPANNER_DATABASE_ID,
ddl_statements=[
"CREATE TABLE my_table1 (id INT64, name STRING(MAX)) PRIMARY KEY (id)",
"CREATE TABLE my_table2 (id INT64, name STRING(MAX)) PRIMARY KEY (id)",
],
task_id="spanner_database_deploy_task",
)
# [END howto_operator_spanner_database_deploy]
# [START howto_operator_spanner_database_update]
spanner_database_update_task = SpannerUpdateDatabaseInstanceOperator(
instance_id=GCP_SPANNER_INSTANCE_ID,
database_id=GCP_SPANNER_DATABASE_ID,
ddl_statements=[
"CREATE TABLE my_table3 (id INT64, name STRING(MAX)) PRIMARY KEY (id)",
],
task_id="spanner_database_update_task",
)
# [END howto_operator_spanner_database_update]
# [START howto_operator_spanner_database_update_idempotent]
spanner_database_update_idempotent1_task = SpannerUpdateDatabaseInstanceOperator(
project_id=PROJECT_ID,
instance_id=GCP_SPANNER_INSTANCE_ID,
database_id=GCP_SPANNER_DATABASE_ID,
operation_id=OPERATION_ID,
ddl_statements=[
"CREATE TABLE my_table_unique (id INT64, name STRING(MAX)) PRIMARY KEY (id)",
],
task_id="spanner_database_update_idempotent1_task",
)
spanner_database_update_idempotent2_task = SpannerUpdateDatabaseInstanceOperator(
instance_id=GCP_SPANNER_INSTANCE_ID,
database_id=GCP_SPANNER_DATABASE_ID,
operation_id=OPERATION_ID,
ddl_statements=[
"CREATE TABLE my_table_unique (id INT64, name STRING(MAX)) PRIMARY KEY (id)",
],
task_id="spanner_database_update_idempotent2_task",
)
# [END howto_operator_spanner_database_update_idempotent]
# [START howto_operator_spanner_query]
spanner_instance_query_task = SpannerQueryDatabaseInstanceOperator(
instance_id=GCP_SPANNER_INSTANCE_ID,
database_id=GCP_SPANNER_DATABASE_ID,
query=["DELETE FROM my_table2 WHERE true"],
task_id="spanner_instance_query_task",
)
# [END howto_operator_spanner_query]
# [START howto_operator_spanner_database_delete]
spanner_database_delete_task = SpannerDeleteDatabaseInstanceOperator(
instance_id=GCP_SPANNER_INSTANCE_ID,
database_id=GCP_SPANNER_DATABASE_ID,
task_id="spanner_database_delete_task",
)
# [END howto_operator_spanner_database_delete]
spanner_database_delete_task.trigger_rule = TriggerRule.ALL_DONE
# [START howto_operator_spanner_delete]
spanner_instance_delete_task = SpannerDeleteInstanceOperator(
instance_id=GCP_SPANNER_INSTANCE_ID, task_id="spanner_instance_delete_task"
)
# [END howto_operator_spanner_delete]
spanner_instance_delete_task.trigger_rule = TriggerRule.ALL_DONE
(
spanner_instance_create_task
>> spanner_instance_update_task
>> spanner_database_deploy_task
>> spanner_database_update_task
>> spanner_database_update_idempotent1_task
>> spanner_database_update_idempotent2_task
>> spanner_instance_query_task
>> spanner_database_delete_task
>> spanner_instance_delete_task
)
# ### Everything below this line is not part of example ###
# ### Just for system tests purpose ###
from tests_common.test_utils.watcher import watcher
# This test needs watcher in order to properly mark success/failure
# when "tearDown" task with trigger rule is part of the DAG
list(dag.tasks) >> watcher()
from tests_common.test_utils.system_tests import get_test_run # noqa: E402
# Needed to run the example DAG with pytest (see: contributing-docs/testing/system_tests.rst)
test_run = get_test_run(dag)