[MapProxy] Caching styles

[Tom Kralidis]

Hi Matt: thanks for the info.  We thought the exact same thing here :)

I wanted to confirm the below to validate the we also need proper style
caching,
which I think should happen after [1] is merged.

Thanks

..Tom

[1] https://github.com/mapproxy/mapproxy/pull/449


On Wed, Mar 10, 2021 at 2:21 PM Matt Walker <walkermatt at longwayaround.org.uk>
wrote:

> Hi Tom,
>
> While testing and reviewing the dimensions PR with Cihan and the team at
> ECMWF we discussed handling styles and wondered if they could be handled in
> a similar way to dimensions.
>
> The dimensions PR introduces additional hierarchy to the file cache folder
> structure based on the dimension name and requested values, it feels as
> though this concept could potentially be extended to styles.
>
> Kind regards,
>
> Matt.
>
> Twitter @_walkermatt/ @astuntech
> GitHub walkermatt/ astuntechnology
>
>
> On Wed, 10 Mar 2021, 18:28 Tom Kralidis, <tomkralidis at gmail.com> wrote:
>
>> Hi: (Tom C and I are working together on the below).  More info:
>>
>> We have a given WMS layer which has, say, 6 styles and are finding that
>> we have to setup
>> a distinct cache/source/layer definition for each layer/style
>> combination.  Users hitting
>> MapProxy would submit STYLES=, to which MapProxy would then issue
>> STYLES=foo
>> (for example) to the upstream WMS given this is configured in MapProxy
>> config.
>>
>> When we configure a layer with NO styles defined in the MapProxy
>> configuration, and issue
>> a STYLES=foo request, MapProxy throws an exception (the style exists in
>> the upstream server).
>>
>> Are we able to setup a single layer definition which allows for STYLES to
>> be passed through?  Or
>> do we have to setup a cache/source/layer definition for each layer/style
>> combination?  See [1]
>> for a sample configuration.
>>
>> Thanks
>>
>> ..Tom
>>
>> [1] https://gist.github.com/tomkralidis/ad89794f1fd0394842fc3cad9e5234f3
>>
>>
>>
>>
>>
>> On Mon, Mar 1, 2021 at 10:58 AM Rahkonen Jukka (MML) <
>> jukka.rahkonen at maanmittauslaitos.fi> wrote:
>>
>>> Hi,
>>>
>>>
>>>
>>> The GetMap request looks correct to me. Does it give an error also if
>>> you send it with a browser? If it does, and if that style is really
>>> advertised for that layer in the GetCapabilities then it feels like a
>>> server side issue.
>>>
>>>
>>>
>>> -Jukka Rahkonen-
>>>
>>>
>>>
>>> *Lähettäjä:* MapProxy <mapproxy-bounces at lists.osgeo.org> *Puolesta *Cooney,
>>> Tom (EC)
>>> *Lähetetty:* maanantai 1. maaliskuuta 2021 16.59
>>> *Vastaanottaja:* mapproxy at lists.osgeo.org
>>> *Aihe:* [MapProxy] Caching styles
>>>
>>>
>>>
>>> Hi,
>>>
>>>
>>>
>>> We are using MapProxy to cache our WMS server. Many of the layers are
>>> available in multiple styles and we wish to cache all available styles. For
>>> example the layer GDPS.ETA_TT is available in the following styles:
>>>
>>>    - TEMPERATURE-LINEAR
>>>    - TEMPSUMMER
>>>    - TEMPSUMMER-LINEAR
>>>    - TEMPWINTER
>>>    - TEMPWINTER-LINEAR
>>>    - TEMPERATURE
>>>
>>> When I make a request with the styles parameter blank I receive the
>>> expected image. However, whenever I add a style to the request I receive an
>>> error saying *StyleNotDefined">unsupported styles: TEMPSUMMER. * A
>>> simplified version of the config I am using is below. A sample request with
>>> blank style parameter and a sample request with *STYLE=TEMPSUMMER* are
>>> also below.
>>>
>>>
>>>
>>> How do I setup these styles in the config?
>>>
>>>
>>>
>>> Thank you for your time,
>>>
>>> Tom Cooney
>>>
>>>
>>>
>>> caches:
>>>   GDPS.ETA_TT_cache:
>>>
>>>     sources:
>>>
>>>     - GDPS.ETA_TT_source
>>>
>>> layers:
>>>
>>>   name: GDPS.ETA_TT
>>>
>>>   sources:
>>>
>>>   - GDPS.ETA_TT_cache
>>>
>>> sources:
>>>
>>>   GDPS.ETA__TT_source:
>>>
>>>     req:
>>>
>>>       layers: GDPS.ETA_TT
>>>
>>>       url: https ....
>>>
>>>       styles: TEMPSUMMER
>>>
>>>
>>>
>>> Request with blank styles parameter (returns the image as expected)
>>>
>>>
>>> http://geomet-dev-03.cmc.ec.gc.ca:8000/service?SERVICE=WMS&VERSION=1.3.0&REQUEST=GetMap&BBOX=-90,-180,90,180&CRS=EPSG:4326&WIDTH=1351&HEIGHT=676&LAYERS=GDPS.ETA_TT&STYLES=&FORMAT=image/png&DPI=96&MAP_RESOLUTION=96&FORMAT_OPTIONS=dpi:96&TRANSPARENT=TRUE&TIME=2021-02-26T00:00:00Z
>>>
>>>
>>>
>>> Request with a style (returns *StyleNotDefined* error)
>>>
>>>
>>> http://geomet-dev-03.cmc.ec.gc.ca:8000/service?SERVICE=WMS&VERSION=1.3.0&REQUEST=GetMap&BBOX=-90,-180,90,180&CRS=EPSG:4326&WIDTH=1351&HEIGHT=676&LAYERS=GDPS.ETA_TT&STYLES=TEMPSUMMER&FORMAT=image/png&DPI=96&MAP_RESOLUTION=96&FORMAT_OPTIONS=dpi:96&TRANSPARENT=T
>>>
>>>
>>>
>>>
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