[](https://circleci.com/gh/hmngwy/py-aws-lambda-handler) [](https://codecov.io/gh/hmngwy/py-aws-lambda-handler)
## aws-lambda-handlers
Better Python 3 AWS Lambda Handlers.
Currently, your only choice for making Python handlers for AWS Lambda is to create a function like so:
```
def handler(event, context):
return True
```
This isn't ideal when you start dealing with more than one handler, or if you want to provide a configurable and reusable handler. This package provides three base classes, the `Handler`, the `Request`, and the `Response` handler.
The `Handler` class is a [callable](https://en.wikipedia.org/wiki/Callable_object), you create a subclass off of this, instantiate it, and that's what you configure AWSλ to invoke.
Your `Handler` has to have a `perform(self, request)` method, this houses your handler's business logic, `Handler.__call__` executes this function and expects a `Response` object.
The `Response` object behaves like a dictionary and an object, an attribute called `serialized` is returned to AWSλ.
The `request` argument in `perform(self, request)` is a `Request` object, and it houses the `event` and `context` parameters that AWSλ passes to your handler. Packaging those handler arguments into an object makes them available for transparent mutations, see [`aws_lambda.apig.APIGatewayRequest`](py-aws-lambda-handler/aws_lambda/apig/\_\_init\_\_.py) for reference.
The foundation of this library is tiny, I recommend reviewing the [main classes](py-aws-lambda-handler/aws_lambda/__init__.py) to further understand how to use this package.
### Usage
```
pip install aws-lambda-handler
```
```python
import aws_lambda
class EchoHandler(aws_lambda.Handler):
"""Echo handler."""
def perform(self, request, **k):
"""Echo perform method."""
response = aws_lambda.Response()
response.body = self.request.event
return response
echo_handler = EchoHandler()
# `echo_handler` is now a callable function you can map your AWS Lambda function to
```
### Develop
Fork this library and send over PRs, I will consider applications for contributors if two of your PRs gets merged and published.
```
pipenv sync --dev # setup
pipenv run pytest # test
```
### Supported Event Sources
- [x] API Gateway `aws_lambda.apig`
- [ ] S3
- [ ] DynamoDB
- [ ] SNS
- [ ] SES
- [ ] SQS
- [ ] Cognito
- [ ] Cloudwatch Logs, Events
#### Help
We want support for more event sources, I am willing to entertain PRs. You can use the `aws_lambda.apig` submodule as an example of implementing more event sources.
