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

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from __future__ import annotations

import io
import json
import zipfile
from datetime import datetime

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, str | None]] = [
        (f"/aws/lambda/{function_name}", None),
    ]

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


with models.DAG(
    DAG_ID,
    schedule="@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)