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Vino Bank Demo: Limits Management Module

Stack: AWS Lambda DynamoDB AWS CDK

API Spec

=======
request
=======
POST /limit?customer_id=<cust_id>
POST /customer/<cust_id>/limit

code: 201. 
body: {"req_id" : "<req_id>"}

=======
release
=======
DELETE /limit/<req_id>

code: 200
body: {"amount" : <amount>}


=======
confirm
=======
POST /limit/<req_id>/confirm

code: 200
body: {"amount" : <amount>}

cheat sheet

# run unit tests
docker run -d -p 8000:8000 amazon/dynamodb-local
export LOCAL_DYNAMODB_URL=http://localhost:8000
pytest tests/unit

# deploy
cdk synth
cdk deploy --require-approval never

# generate requirements.txt
poetry export --without-hashes --format=requirements.txt > requirements.txt

Notes

Pros:

  • infra and code in one repo

Cons:

  • PythonFunction buggy. workaround is to use separate layer to dependencies (extra repo to maintain) or inline the dependencies in runtime directory (extra steps, flake8 throws bunch of warnings)

TODO

  1. use unique event bridge to avoid event trigger lambda in multiple stacks