Add adapter for Zappa (flask) or example

[rezen]

Zappa is a commonly used lambda framework that smushes your Flask app into a lambda. It also provisions and sets up related AWS resources for running the app which is super helpful. I tried leveraging the Flask example and deploying with Zappa, but it didn't work, which isn't surprising since "under the hood" it's actually a lambda invoking the Flask routes. I tried tweaking the flask example with this bit below, but it wasn't quite right. It seemed like events were not being properly processed, I'm not sure.

app = App(
    process_before_response=True,
# ...

https://github.com/zappa/Zappa

Category (place an x in each of the [ ])

• slack_bolt.App and/or its core components
• slack_bolt.async_app.AsyncApp and/or its core components
• Adapters in slack_bolt.adapter
• Others

Requirements

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[seratch]

Hi @rezen, thanks for writing in!

Zappa looks so cool! If I understand correctly, Zappa runs Flask, Django, and so on as-is on FaaS. As long as your Flask app works along with Zappa on FaaS, your bolt-python app should not need any adapter on the bolt-python side.

process_before_response=True

Yes, this option must be enabled for FaaS use case.

Can you share a bit more details such as your current source code, the errors that you are facing with us? In the same reason with #619 (comment) for Quart framework, supporting Zappa is not our high priority. We are happy to help you out as much as possible but we don't have the bandwidth to create a new example in the short term.

Also, I know that you are planning to use Zappa for your app management but in general, we highly recommend our simple aws-lambda adapter. With the adapter, you can more easily take advantage of built-in features such as lazy listeners: https://slack.dev/bolt-python/concepts#lazy-listeners For FaaS use cases, lazy listeners are so powerful. Implementing the same on your own would require more efforts and research.

I hope this was helpful to you!

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