Source code for tests.system.providers.amazon.aws.example_lambda

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import io
import json
import zipfile
from datetime import datetime
from typing import List, Optional, Tuple

import boto3

from airflow import models
from airflow.decorators import task
from airflow.models.baseoperator import chain
from airflow.providers.amazon.aws.operators.lambda_function import AwsLambdaInvokeFunctionOperator
from airflow.utils.trigger_rule import TriggerRule
from tests.system.providers.amazon.aws.utils import ENV_ID_KEY, SystemTestContextBuilder, purge_logs

[docs]DAG_ID = 'example_lambda'

# Externally fetched variables:
[docs]ROLE_ARN_KEY = 'ROLE_ARN'

[docs]sys_test_context_task = SystemTestContextBuilder().add_variable(ROLE_ARN_KEY).build()

[docs]CODE_CONTENT = """
def test(*args):
    print('Hello')
"""


# Create a zip file containing one file "lambda_function.py" to deploy to the lambda function
[docs]def create_zip(content: str):
    zip_output = io.BytesIO()
    with zipfile.ZipFile(zip_output, "w", zipfile.ZIP_DEFLATED) as zip_file:
        info = zipfile.ZipInfo("lambda_function.py")
        info.external_attr = 0o777 << 16
        zip_file.writestr(info, content)
    zip_output.seek(0)
    return zip_output.read()


@task
[docs]def create_lambda(function_name: str, role_arn: str):
    client = boto3.client('lambda')
    client.create_function(
        FunctionName=function_name,
        Runtime='python3.9',
        Role=role_arn,
        Handler='lambda_function.test',
        Code={
            'ZipFile': create_zip(CODE_CONTENT),
        },
        Description='Function used for system tests',
    )


@task
[docs]def await_lambda(function_name: str):
    client = boto3.client('lambda')
    waiter = client.get_waiter('function_active_v2')
    waiter.wait(FunctionName=function_name)


@task(trigger_rule=TriggerRule.ALL_DONE)
[docs]def delete_lambda(function_name: str):
    client = boto3.client('lambda')
    client.delete_function(
        FunctionName=function_name,
    )


@task(trigger_rule=TriggerRule.ALL_DONE)
[docs]def delete_logs(function_name: str) -> None:
    generated_log_groups: List[Tuple[str, Optional[str]]] = [
        (f'/aws/lambda/{function_name}', None),
    ]

    purge_logs(test_logs=generated_log_groups, force_delete=True, retry=True)


with models.DAG(
    DAG_ID,
    schedule_interval='@once',
    start_date=datetime(2021, 1, 1),
    tags=['example'],
    catchup=False,
) as dag:
[docs]    test_context = sys_test_context_task()

    lambda_function_name: str = f'{test_context[ENV_ID_KEY]}-function'

    # [START howto_operator_lambda]
    invoke_lambda_function = AwsLambdaInvokeFunctionOperator(
        task_id='invoke_lambda_function',
        function_name=lambda_function_name,
        payload=json.dumps({"SampleEvent": {"SampleData": {"Name": "XYZ", "DoB": "1993-01-01"}}}),
    )
    # [END howto_operator_lambda]

    chain(
        # TEST SETUP
        test_context,
        create_lambda(lambda_function_name, test_context[ROLE_ARN_KEY]),
        await_lambda(lambda_function_name),
        # TEST BODY
        invoke_lambda_function,
        # TEST TEARDOWN
        delete_lambda(lambda_function_name),
        delete_logs(lambda_function_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/README.md#run_via_pytest)
[docs]test_run = get_test_run(dag)