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 (
    LambdaCreateFunctionOperator,
    LambdaInvokeFunctionOperator,
)
from airflow.providers.amazon.aws.sensors.lambda_function import LambdaFunctionStateSensor
from airflow.utils.trigger_rule import TriggerRule
from tests.system.providers.amazon.aws.utils import ENV_ID_KEY, SystemTestContextBuilder, prune_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(trigger_rule=TriggerRule.ALL_DONE)

[docs]def delete_lambda(function_name: str):
    client = boto3.client("lambda")
    client.delete_function(
        FunctionName=function_name,
    )



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"
    role_arn = test_context[ROLE_ARN_KEY]

    # [START howto_operator_create_lambda_function]
    create_lambda_function = LambdaCreateFunctionOperator(
        task_id="create_lambda_function",
        function_name=lambda_function_name,
        runtime="python3.9",
        role=role_arn,
        handler="lambda_function.test",
        code={
            "ZipFile": create_zip(CODE_CONTENT),
        },
    )
    # [END howto_operator_create_lambda_function]

    # [START howto_sensor_lambda_function_state]
    wait_lambda_function_state = LambdaFunctionStateSensor(
        task_id="wait_lambda_function_state",
        function_name=lambda_function_name,
    )
    # [END howto_sensor_lambda_function_state]
    wait_lambda_function_state.poke_interval = 1

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

    log_cleanup = prune_logs(
        [
            # Format: ('log group name', 'log stream prefix')
            (f"/aws/lambda/{lambda_function_name}", None),
        ],
        force_delete=True,
        retry=True,
    )

    chain(
        # TEST SETUP
        test_context,
        # TEST BODY
        create_lambda_function,
        wait_lambda_function_state,
        invoke_lambda_function,
        # TEST TEARDOWN
        delete_lambda(lambda_function_name),
        log_cleanup,
    )

    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)

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