I don't agree with this. the mapproxy package doesn't require this https://github.com/mapproxy/mapproxy/blob/master/setup.py

I would just add it to this to your development environment

Hi @jonringer ,

As per https://mapproxy.org/docs/nightly/caches.html#s3

s3

New in version 1.10.0.

New in version 1.11.0: region_name, endpoint_url and access_control_list

Store tiles in a Amazon Simple Storage Service (S3) or any other S3 compatible object storage.

Requirements

You will need the Python boto3 package. You can install it in the usual way, for example with pip install boto3.

Also : import of boto3 is required inside mapproxy, when trying to use s3.
https://github.com/mapproxy/mapproxy/blob/master/mapproxy/cache/s3.py#L29

Please suggest.
Thanks.

it's still an optional dependency, they have try..catch logic around their import to ensure it doesn't break at runtime, and will only error if you try to then use the caches service.....

That being said, I just realized this is an application and not a python-module. I guess it would be hard to inject as you would have to override the derivation.

@GrahamcOfBorg build mapproxy