Bug: AppSyncResolver Context not set in tests

[averypelle]

Expected Behaviour

My expectation is that setting app.appendContext like the example in the docs will work in both a deployed application and in testing.

Docs for Sharing contextual data
Docs for Testing your code

Current Behaviour

The current behavior is that the app context is properly set in my deployed application and retrievable in the Router but is not properly set when using the app under the pytest configuration described in the docs.

Code snippet

I adapted an example from the docs to be reproducible with a simple Pytest file.

# chat_graphql_api/main.py
from aws_lambda_powertools import Logger, Tracer
from aws_lambda_powertools.event_handler import AppSyncResolver
from aws_lambda_powertools.logging import correlation_paths
from aws_lambda_powertools.utilities.typing import LambdaContext

from chat_graphql_api import second_module

tracer = Tracer()
logger = Logger()
app = AppSyncResolver()
app.include_router(second_module.router)


@logger.inject_lambda_context(correlation_id_path=correlation_paths.APPSYNC_RESOLVER)
@tracer.capture_lambda_handler
def lambda_handler(event: dict, context: LambdaContext) -> dict:
    app.append_context(is_admin=True)  # arbitrary number of key=value data
    return app.resolve(event, context)

# chat_graphql_api/second_module.py
from aws_lambda_powertools import Logger, Tracer
from aws_lambda_powertools.event_handler.appsync import Router
from typing import List, TypedDict

tracer = Tracer()
logger = Logger()
router = Router()


class Location(TypedDict, total=False):
    id: str  # noqa AA03 VNE003, required due to GraphQL Schema
    name: str
    description: str
    address: str


@router.resolver(field_name="listLocations")
@router.resolver(field_name="locations")
@tracer.capture_method
def get_locations(
    name: str,
    description: str = "",
) -> List[Location]:  # match GraphQL Query arguments
    is_admin: bool = router.context.get("is_admin", False)
    return (
        [
            {
                "name": name,
                "description": description,
            },
        ]
        if is_admin
        else []
    )

# chat_graphql_api_tests/test_main.py
import pytest


@pytest.fixture
def mock_event_factory():
    def create_mock_event(name, description):
        return {
            "typeName": "Query",
            "fieldName": "listLocations",
            "arguments": {
                "name": name,
                "description": description,
            },
            "selectionSetList": ["id", "name"],
            "identity": None,
            "request": {
                "headers": {
                    "x-api-key": "da1-c33ullkbkze3jg5hf5ddgcs4fq",
                }
            },
        }

    return create_mock_event


def test_resolver(mock_event_factory):
    # GIVEN
    from chat_graphql_api.main import app

    mock_lambda_context = {
        "function_name": "test",
        "memory_limit_in_mb": 128,
        "invoked_function_arn": "arn:aws:lambda:us-east-1:123456789012:function:test",
        "aws_request_id": "da658bd3-2d6f-4e7b-8ec2-937234644fdc",
    }

    name = "hello world"
    description = "this is a test"

    mock_event = mock_event_factory(name, description)

    # WHEN
    response = app(
        event=mock_event,
        context=mock_lambda_context,
    )

    # THEN
    assert response == [
        {
            "name": name,
            "description": description,
        },
    ]

I am using Python 3.9 and pipenv version 2023.11.15 with the Pipfile and lockfile below, just to be certain it's not something with my env. In production, I am using the AWS Lambda powertools layer with ARN arn:aws:lambda:us-east-1:017000801446:layer:AWSLambdaPowertoolsPythonV2-Arm64:32.

Pipfile and Pipfile.lock

Pipfile

[dev-packages]
aws-lambda-powertools = { extras = ["all"], version = "*" }
pytest = "*"

[requires]
python_version = "3.9"

Pipfile.lock

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                "sha256:edfad1d29c73f9b863ebe7082ae9321374ccb10879eeabc84ba3b69f2579d537",
                "sha256:f2058f813d4f2b5e3a9eb2eb3faf8f1d99b81c3e51aeda4b168406443e8ba809",
                "sha256:f6b2d0c6703c988d334f297aa5df18c45e97b0af3679bb75059e0e0bd8b1069d",
                "sha256:f8212564d49c50eb4565e502814f694e240c55551a5f1bc841d4fcaabb0a9b8a",
                "sha256:ffa565331890b90056c01db69c0fe634a776f8019c143a5ae265f9c6bc4bd6d4"
            ],
            "markers": "python_version >= '3.6'",
            "version": "==1.16.0"
        }
    }
}

Possible Solution

No response

Steps to Reproduce

Please copy the files indicated above into their requisite file paths and then run the testing suite above to reproduce

1. pipenv install --dev
2. pipenv run pytest -vv chat_graphql_api_tests

When this command is run, it gives the following assertion error, indicating that is_admin is not being set.

E       AssertionError: assert [] == [{'name': 'hello world', 'description': 'this is a test'}]
E         Right contains one more item: {'description': 'this is a test', 'name': 'hello world'}
E         Full diff:
E         - [{'description': 'this is a test', 'name': 'hello world'}]
E         + []

Powertools for AWS Lambda (Python) version

latest

AWS Lambda function runtime

4.9

Packaging format used

Lambda Layers

Debugging logs

No response

[boring-cyborg]

Thanks for opening your first issue here! We'll come back to you as soon as we can.
In the meantime, check out the #python channel on our Powertools for AWS Lambda Discord: Invite link

[rubenfonseca]

Looking at this now

[rubenfonseca]

Hi @averypelle thank you for opening this issue! I've tested some code and noticed that because you are calling the resolver directly, the app.append_context line doesn't have the oportunity to run, since it's inside the lambda handler.

Two ways I can think to solve this:

1. call the lambda handler directly instead of the event resolver:

lambda_handler(event=mock_event, context=mock_lambda_context)

This way the context will be appended.

2. append the context in your text before invoking your event resolver:

app.append_context(is_admin=True)
app(event=mock_event, context=mock_lambda_context)

Both of this should solve your problem. I'm closing the bug report for now, but please feel free to re-open if you need additional support!

[github-actions]

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[averypelle]

@rubenfonseca Thank you very much!! I appreciate the response. I can confirm that your solution worked for me.