[MapProxy] Cache is storing in the incorrect format

[Ryan How]

Hi Again,

I discovered that setting a cache to JPEG with a tile source that is PNG 
results in the cache storing tiles in PNG format (and naming them as 
.jpeg). The resulted images served to the browser are also in PNG even 
though the cache is set to JPEG.

I worked around this by creating a cache for this source, then another 
cache pointing to this cache. This seemed a bit counter-intuitive to me.

I just want to know if this is how it is supposed to work?

I can just turn off storage for the intermediate cache with 
disable_storage: true.

It just had me confused for a while why my tiles were all in png, when I 
specifically have specified jpeg.



The configuration snippet is:


sources:

   tms1:
     type: tile
     grid: GLOBAL_WEBMERCATOR
     supported_formats: [image/png]
     format: image/png
     url: https://example.com/%(z)s/%(x)s/%(y)s.png
     transparent: true

caches:

   cache1:  #This cache is storing the tiles as PNG encoded, even though 
they are named as jpeg
     format: image/jpeg
     meta_size: [1, 1] #So I can isolate the time for a single tile
     request_format: image/jpeg
     grids: [webmercator]
     sources: [tms1]


A working configuration is:


sources:

   tms1:
     type: tile
     grid: GLOBAL_WEBMERCATOR
     supported_formats: [image/png]
     format: image/png
     url: https://example.com/%(z)s/%(x)s/%(y)s.png
     transparent: true

caches:

   cache1:
     format: image/png
     request_format: image/png
     grids: [webmercator]
     sources: [tms1]

   cache2:
     format: image/jpeg
     request_format: image/jpeg
     grids: [webmercator]
     sources: [cache1]


Thanks, Ryan

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