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"""
Example Airflow DAG for Google Cloud Memorystore Memcached service.
"""
from __future__ import annotations
import os
from datetime import datetime
from google.protobuf.field_mask_pb2 import FieldMask
from airflow import models
from airflow.providers.google.cloud.operators.cloud_memorystore import (
CloudMemorystoreMemcachedApplyParametersOperator,
CloudMemorystoreMemcachedCreateInstanceOperator,
CloudMemorystoreMemcachedDeleteInstanceOperator,
CloudMemorystoreMemcachedGetInstanceOperator,
CloudMemorystoreMemcachedListInstancesOperator,
CloudMemorystoreMemcachedUpdateInstanceOperator,
CloudMemorystoreMemcachedUpdateParametersOperator,
)
from airflow.utils.trigger_rule import TriggerRule
[docs]ENV_ID = os.environ.get("SYSTEM_TESTS_ENV_ID")
[docs]PROJECT_ID = os.environ.get("SYSTEM_TESTS_GCP_PROJECT", "google_project_id")
[docs]DAG_ID = "cloud_memorystore_memcached"
[docs]MEMORYSTORE_MEMCACHED_INSTANCE_NAME = f"{ENV_ID}-memcached-1"
[docs]LOCATION = "europe-north1"
# [START howto_operator_memcached_instance]
[docs]MEMCACHED_INSTANCE = {"name": "", "node_count": 1, "node_config": {"cpu_count": 1, "memory_size_mb": 1024}}
# [END howto_operator_memcached_instance]
with models.DAG(
DAG_ID,
schedule='@once', # Override to match your needs
start_date=datetime(2021, 1, 1),
catchup=False,
tags=['example'],
) as dag:
# [START howto_operator_create_instance_memcached]
[docs] create_memcached_instance = CloudMemorystoreMemcachedCreateInstanceOperator(
task_id="create-instance",
location=LOCATION,
instance_id=MEMORYSTORE_MEMCACHED_INSTANCE_NAME,
instance=MEMCACHED_INSTANCE,
project_id=PROJECT_ID,
)
# [END howto_operator_create_instance_memcached]
# [START howto_operator_delete_instance_memcached]
delete_memcached_instance = CloudMemorystoreMemcachedDeleteInstanceOperator(
task_id="delete-instance",
location=LOCATION,
instance=MEMORYSTORE_MEMCACHED_INSTANCE_NAME,
project_id=PROJECT_ID,
)
# [END howto_operator_delete_instance_memcached]
delete_memcached_instance.trigger_rule = TriggerRule.ALL_DONE
# [START howto_operator_get_instance_memcached]
get_memcached_instance = CloudMemorystoreMemcachedGetInstanceOperator(
task_id="get-instance",
location=LOCATION,
instance=MEMORYSTORE_MEMCACHED_INSTANCE_NAME,
project_id=PROJECT_ID,
)
# [END howto_operator_get_instance_memcached]
# [START howto_operator_list_instances_memcached]
list_memcached_instances = CloudMemorystoreMemcachedListInstancesOperator(
task_id="list-instances", location="-", project_id=PROJECT_ID
)
# [END howto_operator_list_instances_memcached]
# [START howto_operator_update_instance_memcached]
update_memcached_instance = CloudMemorystoreMemcachedUpdateInstanceOperator(
task_id="update-instance",
location=LOCATION,
instance_id=MEMORYSTORE_MEMCACHED_INSTANCE_NAME,
project_id=PROJECT_ID,
update_mask=FieldMask(paths=["node_count"]),
instance={"node_count": 2}, # 2
)
# [END howto_operator_update_instance_memcached]
# [START howto_operator_update_and_apply_parameters_memcached]
update_memcached_parameters = CloudMemorystoreMemcachedUpdateParametersOperator(
task_id="update-parameters",
location=LOCATION,
instance_id=MEMORYSTORE_MEMCACHED_INSTANCE_NAME,
project_id=PROJECT_ID,
update_mask={"paths": ["params"]},
parameters={"params": {"protocol": "ascii", "hash_algorithm": "jenkins"}},
)
apply_memcached_parameters = CloudMemorystoreMemcachedApplyParametersOperator(
task_id="apply-parameters",
location=LOCATION,
instance_id=MEMORYSTORE_MEMCACHED_INSTANCE_NAME,
project_id=PROJECT_ID,
node_ids=["node-a-1"],
apply_all=False,
)
# [END howto_operator_update_and_apply_parameters_memcached]
(
create_memcached_instance
>> get_memcached_instance
>> list_memcached_instances
>> update_memcached_instance
>> update_memcached_parameters
>> apply_memcached_parameters
>> delete_memcached_instance
)
# ### Everything below this line is not part of example ###
# ### Just for system tests purpose ###
from tests.system.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.system.utils import get_test_run # noqa: E402
# Needed to run the example DAG with pytest (see: tests/system/README.md#run_via_pytest)
[docs]test_run = get_test_run(dag)
