[MapProxy] Chance the cache using a dpi parameter from the request

[Andrea Peri]

Hi Walker,

Comparing your code with mine , I have found my errors and have
success to change the layername in the request.

Many thx for you great help.

A.

2017-09-30 21:31 GMT+02:00 Matt Walker <walkermatt at longwayaround.org.uk>:
> Hi Andrea,
>
> I've just posted this gist which demonstrates the approach I've used to
> manipulate the querystring before calling MapProxy:
> https://gist.github.com/walkermatt/970a1520dd4c507db57cd9c2b09b55d7
>
> Hope it helps,
>
> Matt.
>
> On 29 September 2017 at 11:42, Andrea Peri <aperi2007 at gmail.com> wrote:
>>
>> Hi Matt,
>>
>> I try to develope a simply wsgi filter following the suggests of mapproxy
>> doc,
>>
>> But It don't seem to work as I hope.
>> Infact the wsgi filter is executed after the request has reached the
>> mapproxy, so seem to be late for ac action to change the layersname.
>>
>> In the config infact the order of execution is:
>>
>> application = make_wsgi_app(r'/....//mapproxy.yaml')
>> application = FilterTochangeLayerName(application,....)
>>
>> So before the mapproxy do its actions on the original layer and only
>> after the filter is able to change the layername, but is too late.
>>
>> I try to understand if was possible to invert the two rows.
>> Before the filter and after the make_wsgi_app.
>>
>> But it seem not possible.
>>
>> I wrong something ?
>>
>> Thx,
>> A.
>>
>>
>> 2017-09-25 12:24 GMT+02:00 Matt Walker <walkermatt at longwayaround.org.uk>:
>> > Hi Andrea,
>> >
>> > We do something similar using a WSGI filter in front of MapProxy. In the
>> > filter we look for DPI parameter and update the LAYERS query string
>> > parameter to the appropriate layer based on it. Details of creating a
>> > WSGI
>> > filter for MapProxy can be found here:
>> > https://mapproxy.org/docs/1.10.0/auth.html. Our logic DPI logic is
>> > within
>> > the __call__ method.
>> >
>> > Hope that helps,
>> >
>> > Matt.
>> >
>> > On 22 September 2017 at 12:41, Andrea Peri <aperi2007 at gmail.com> wrote:
>> >>
>> >> Hi,
>> >>
>> >> I need to change the resolution of the map returned following the dpi
>> >> parameter from the request of the gis client.
>> >> To do this, I try to find a solution to use a different cache folder
>> >> for
>> >> the same layer when the dpi from the request are different.
>> >>
>> >> I try to have 2 kind of cache. One for 90 dpi and another for 300dpi.
>> >> The layer should take from the 90 when the user do not put the dpi
>> >> param
>> >> or set explicitly the dpi=90.
>> >> Otherwise the layer use the 300 dpi cache when the user request ask
>> >> foto
>> >> dpi=300.
>> >>
>> >> Is this allowed with mapproxy ?
>> >>
>> >> Manu THX.
>> >> Andrea Peri
>> >>
>> >>
>> >>
>> >> _______________________________________________
>> >> MapProxy mailing list
>> >> MapProxy at lists.osgeo.org
>> >> https://lists.osgeo.org/mailman/listinfo/mapproxy
>> >
>> >
>> >
>> >
>> > --
>> > Matt Walker
>> > @_walkermatt
>>
>>
>>
>> --
>> -----------------
>> Andrea Peri
>> . . . . . . . . .
>> qwerty àèìòù
>> -----------------
>
>
>
>
> --
> Matt Walker
> @_walkermatt



-- 
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Andrea Peri
. . . . . . . . .
qwerty àèìòù
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