[MapProxy] Improved granularity for seed refresh

[Moritz Kirmse]

Hello,

I started work on this topic.
The basic functionality for refreshing existing tiles only is already
implemented, but it cannot be configured.

in the (draft) PR below, I chose to introduce a command-line parameter for
mapproxy-seed, --skip-uncached
https://github.com/mapproxy/mapproxy/pull/515
This seems more logical to me than including this parameter in the
configuration file (as I had initially imagined with the parameter
existing_tiles_only: True)

as for the second feature (keep_missing_files), everything already exists,
it can be managed by the error handler in the mapproxy configuration with
cache: False:
sources:
  my_source:
    on_error:
      other:
        response: '#ff0000'
        cache: False

best regards,
Moritz


On Thu, May 6, 2021 at 5:11 PM Moritz Kirmse <moritz.kirmse at camptocamp.com>
wrote:

> Hello,
>
> I am starting to develop a new feature for Mapproxy which is needed to get
> rid of some custom scripts, so that MapProxy can handle our whole tile
> caching workflow by its own.
>
> We would like to add the following two features to the mapproxy-seed
> configuration:
>
> - restriction of reseeding to existing tiles only, once they have become
> expired.
> - conservation of old/stale tiles in case of missing replacement (source
> not available, for ex. http error).
>
> This might be two non-default options under the 'refresh_before' tree in
> the seed.yaml file and look like in the example below:
>
> seeds:
>   myseed1:
>     refresh_before:
>       weeks: 1
>       existing_tiles_only: True
>       keep_missing_files: True
>
>
> I was about to create a Github issue for discussion on the topic, but it
> said issues are reserved to bugs and the mailing list shall be used for
> feature discussion.
>
> So I will create a pull request and refine the feature there.
>
> An existing PR will be useful for this feature, and I will be using it for
> development:
> https://github.com/mapproxy/mapproxy/pull/453 (Added max-repeat param
> #453)
>
> Do not hesitate to leave me any comments and suggestions, in case I
> overlooked something.
>
> Best regards,
> Moritz
>
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