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from __future__ import annotations

from datetime import datetime
from operator import itemgetter

import boto3

from airflow import DAG
from airflow.decorators import task
from airflow.models.baseoperator import chain
from import (
from import EC2InstanceStateSensor
from airflow.utils.trigger_rule import TriggerRule
from import ENV_ID_KEY, SystemTestContextBuilder

[docs]DAG_ID = "example_ec2"
[docs]sys_test_context_task = SystemTestContextBuilder().build()
[docs]def get_latest_ami_id(): """Returns the AMI ID of the most recently-created Amazon Linux image""" # Amazon is retiring AL2 in 2023 and replacing it with Amazon Linux 2022. # This image prefix should be futureproof, but may need adjusting depending # on how they name the new images. This page should have AL2022 info when # it comes available: image_prefix = "Amazon Linux*" images = boto3.client("ec2").describe_images( Filters=[ {"Name": "description", "Values": [image_prefix]}, {"Name": "architecture", "Values": ["arm64"]}, ], Owners=["amazon"], ) # Sort on CreationDate sorted_images = sorted(images["Images"], key=itemgetter("CreationDate"), reverse=True) return sorted_images[0]["ImageId"]
[docs]def create_key_pair(key_name: str): client = boto3.client("ec2") key_pair_id = client.create_key_pair(KeyName=key_name)["KeyName"] # Creating the key takes a very short but measurable time, preventing race condition: client.get_waiter("key_pair_exists").wait(KeyNames=[key_pair_id]) return key_pair_id
[docs]def delete_key_pair(key_pair_id: str): boto3.client("ec2").delete_key_pair(KeyName=key_pair_id)
[docs]def parse_response(instance_ids: list): return instance_ids[0]
with DAG( dag_id=DAG_ID, schedule="@once", start_date=datetime(2021, 1, 1), tags=["example"], catchup=False, ) as dag:
[docs] test_context = sys_test_context_task()
env_id = test_context[ENV_ID_KEY] instance_name = f"{env_id}-instance" key_name = create_key_pair(key_name=f"{env_id}_key_pair") image_id = get_latest_ami_id() config = { "InstanceType": "t4g.micro", "KeyName": key_name, "TagSpecifications": [ {"ResourceType": "instance", "Tags": [{"Key": "Name", "Value": instance_name}]} ], # Use IMDSv2 for greater security, see the following doc for more details: # "MetadataOptions": {"HttpEndpoint": "enabled", "HttpTokens": "required"}, } # EC2CreateInstanceOperator creates and starts the EC2 instances. To test the EC2StartInstanceOperator, # we will stop the instance, then start them again before terminating them. # [START howto_operator_ec2_create_instance] create_instance = EC2CreateInstanceOperator( task_id="create_instance", image_id=image_id, max_count=1, min_count=1, config=config, ) # [END howto_operator_ec2_create_instance] create_instance.wait_for_completion = True instance_id = parse_response(create_instance.output) # [START howto_operator_ec2_stop_instance] stop_instance = EC2StopInstanceOperator( task_id="stop_instance", instance_id=instance_id, ) # [END howto_operator_ec2_stop_instance] stop_instance.trigger_rule = TriggerRule.ALL_DONE # [START howto_operator_ec2_start_instance] start_instance = EC2StartInstanceOperator( task_id="start_instance", instance_id=instance_id, ) # [END howto_operator_ec2_start_instance] # [START howto_sensor_ec2_instance_state] await_instance = EC2InstanceStateSensor( task_id="await_instance", instance_id=instance_id, target_state="running", ) # [END howto_sensor_ec2_instance_state] # [START howto_operator_ec2_terminate_instance] terminate_instance = EC2TerminateInstanceOperator( task_id="terminate_instance", instance_ids=instance_id, wait_for_completion=True, ) # [END howto_operator_ec2_terminate_instance] terminate_instance.trigger_rule = TriggerRule.ALL_DONE chain( # TEST SETUP test_context, key_name, image_id, # TEST BODY create_instance, instance_id, stop_instance, start_instance, await_instance, terminate_instance, # TEST TEARDOWN delete_key_pair(key_name), ) 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/
[docs]test_run = get_test_run(dag)

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