[PyWPS-dev] Process Chaining

[Suzana Barreto]

Hi Carsten,

Thanks for getting back to me with the info, the links on testing are
definitely helpful, and I had come across the Ana Homolka contribution but
I was not sure whether it had been implemented in the current version of
PyWPS.  I think it should be possible to chain processes using the XML
approach given the correct tag to nest within the input section of a
process, the next execute request.  Unfortunately, the geoserver chained
xml docs are not compatible.

Thanks again,
Suzana



On Thu, 6 Dec 2018 at 13:54, Carsten Ehbrecht <ehbrecht at dkrz.de> wrote:

> Hi Suzana,
>
> I haven’t tried process chaining for a long time and I didn’t investigate.
> But it would be nice to find out :)
>
> There can be issues both in owslib.wps and pywps. I would recommend to
> start with “pure” WPS requests and not using owslib.wps (which might not
> support chaining at the moment).
>
> Some links on testing pywps:
>
> * https://github.com/PyWPS/pywps-workshop/blob/master/03-Testing.md
> * https://birdhouse-workshop.readthedocs.io/en/latest/pywps/testing.html
>
> I can share my links on WPS chaining:
>
> * https://geoserver.geo-solutions.it/edu/en/wps/chaining_processes.html
> * https://geoserver.geo-solutions.it/edu/en/wps/chaining_processes.html
>
> And also something with PyWPS but with the old 3.x version … don’t use it,
> just for reference:
>
> *
> https://github.com/AnnaHomolka/PyWPS/blob/master/doc/tutorial_process_chaining.pdf
> *
> https://www.slideshare.net/foss4g2011/eberle-processing-chainsmodispresentation
>
> Please share you experience … you may use a GitHub issue.
>
> Sorry, for the wait.
>
> Cheers,
> Carsten
> --
> Carsten Ehbrecht
> Abteilung Datenmanagement
>
> Deutsches Klimarechenzentrum GmbH (DKRZ)
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>
> On 12 Nov 2018, at 3:53 pm, Suzana Barreto <suzana.barreto at envsys.co.uk>
> wrote:
>
> Hi All,
>
> I was wondering if there is an xml template or xml example of a chained
> process POST request.  I have been trying to use OWSLib to chain my PyWPS
> Process requests but am finding it difficult as there is no examples of how
> this is achieved using OWSLib.  I have been able to 'simulate' a chained
> request by sending requests in order and then using the output from the
> first as the input to the next.  I have also tried embedding a request in
> another but have found that the library escapes the xml special characters,
> resulting in malformed xml.  I also attempted to manually create an XML
> POST request but not sure how the embedding is achieved ie. what is the
> element called that identifies a chained or embedded request.  So I would
> therefore like to know if anyone can point me in the right direction in
> terms of what the XML for a chained PyWPS request would look like.
>
> Thanks,
> Suzana
> --
>
>
>
> *Dr Suzana BarretoSoftware AnalystEnvironment Systems*
> Tel: +44 (0) 1970 626688
> www.envsys.co.uk
>
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-- 



*Dr Suzana BarretoSoftware AnalystEnvironment Systems*
Tel: +44 (0) 1970 626688
www.envsys.co.uk

The information contained in this e-mail is intended only for the use of
the person(s) to whom it is addressed and may contain confidential or
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