[QGIS-Developer] QGIS Server 3 status

Thu Oct 5 00:34:11 PDT 2017

Hi Règis,

thanks for the nice summary!

Maybe it would be interesting for python devs to stress out how QGIS server
3 brings the bindings and the plugins to a new level: while the original
filter-style python plugins, are still available, the new service-oriented
plugin-based architecture allows Python developers to create new services
(for example WPS) by implementing a new `QgsService` directly in Python.
Overriding existing services is also possible.

The server API has now full python bindings and a QGIS server can be easily
implemented directly in Python and wrapped into your favourite framework
(see this simple wsgi experiment:
https://gist.github.com/elpaso/0cd7fb6a0518dc46c45557d9133438b8 ).

For more examples of the API, I think there are some basic examples in the
official Python tests:
https://github.com/qgis/QGIS/blob/master/tests/src/python/test_qgsserver_services.py#L79

Cheers

On Wed, Oct 4, 2017 at 10:49 PM, Régis Haubourg <regis.haubourg at gmail.com>
wrote:

> Well, from a user point of view, that's a bit hard since all this is 90 %
> refactoring.. which is supposed to be transparent for users.
>
> We have the trust and multithreaded features, that should (and early
> testers today found it slower today) and the ability to code new services
> using python.
> We can also show some numbers about OGC conformity tests and the goal of
> reaching OGC certification (WMS only by now).
>
> Alessandro, René-Luc and David, do you have some user oriented examples
> for the new modular API ?
>
>
>
> 2017-10-04 22:18 GMT+02:00 Anita Graser <anitagraser at gmx.at>:
>
>> Great overview, thanks for drafting Régis!
>>
>> Some additional ideas: Could we add a section with the key improvements
>> from an user perspective?
>>
>> I'm particularly intrigued by the services / plugins part. Could you
>> elaborate?
>>
>> Regards,
>> Anita
>>
>>
>>
>> On Wed, Oct 4, 2017 at 9:42 PM, Régis Haubourg <regis.haubourg at gmail.com>
>> wrote:
>>
>>> Hi again,
>>> here is my very first draft:
>>>
>>>  Several images can be pulled from the joined slides given at Foss4G-EU
>>> here https://drive.google.com/file/d/0BzatQbprJ-hjWF95VzdHbGRsVEk
>>> /view?usp=sharing
>>>
>>> René-Luc, David, Paul, don't hesitate to amend that!
>>>
>>> ------------------------------------------------------------
>>> --------------------------------
>>>
>>>
>>> *Qgis server refactoring is done!*
>>> As you may know, QGIS is jumping to a new major version (yes!).
>>> Doing so was made necessary because of the need to switch to python 3,
>>> QT5, but also because we needed to break the QGIS API in several places.
>>>
>>> A year ago, a tiny troll <https://github.com/qgis/qgis3.0_api/issues/63>from
>>> switzerland rang a bell about the strong need for love server code base
>>> required.
>>>
>>> Indeed, the API was locked by some old methods of QGIS server. In short,
>>> QGIS server was reparsing the qgs project file in his own way, and created
>>> dependencies to part of QGIS we needed to drop.
>>>
>>> As outsourcing the server code base was not an option, so we had to
>>> refactor it.
>>>
>>> The involved parties decided to get engaged in a code sprint
>>> <https://github.com/qgis/QGIS/wiki/QGIS3---QGIS-Server-code-sprint-Notes> in
>>> the city of Lyon , France dedicated to sharing their vision, planning the
>>> work and finally making all the following
>>> <https://github.com/qgis/QGIS-Enhancement-Proposals/issues/74> happen :
>>>
>>>
>>>
>>> *# Deep, complex and unrewarding tasks:*
>>>
>>> - Remove all singleton calls
>>>
>>> - Cut all the dependencies to the old qgis project parser
>>>
>>> - Minimize dependencies to GUI library. Since fonts are necessary to
>>> render maps, totally removing them was not feasable.
>>>
>>> *# Higher level refactoring*
>>>
>>> All services (WMS GetMap, WFS GetFeature, GetLegendGraphics, WCS,
>>> GetPrint etc..) have been rewritten. Some like WMS were entirely rewritten.
>>> Kudos to the dev's
>>>
>>>
>>> *# New features and architecture stuff*
>>>
>>> - QGIS Server Services as plugins like providers. (slide 10 would be a
>>> nice figure here)
>>>
>>> - Multi-thread rendering  <https://github.com/qgis/QGIS/pull/3886>-
>>> like in the desktop
>>>
>>> - A new option to trust layer metadata
>>> <https://github.com/qgis/QGIS/pull/5094> and speed up project loading
>>>
>>>
>>> *# Infrastructure tasks*
>>>
>>> - Build a OGC compliancy platform
>>> <http://oslandia.com/en/2017/06/16/qgis-server-ogc-cite-compliance-testing/> and
>>> integrate it to a continuous integration platform. Conformity reports are
>>> now pushed to tests.qgis.org *XXX waiting for Richard to expose them in
>>> the website*
>>>
>>> - Add unit tests... and again more unit tests
>>>
>>> - Stress QGIS server against security leaks
>>> <http://oslandia.com/en/2017/06/14/qgis-server-security-aspect/> (SQL
>>> injections and other malicious attacks)
>>>
>>> - Start profiling and bench marking performances. This work still need
>>> some love - and funding - to be achieved
>>>
>>>
>>> A presentation
>>> <https://git.osgeo.org/gogs/foss4g-europe/foss4g-europe-2017-paris/src/master/presentations/2017-07-20/general_track/foss4g-europe-2017-QGIS_3_Refactoring_and_enhancement-DMarteau-PBlottiere.pdf> was
>>> given at FOSS4G-EU in July.
>>>
>>> *Congratulations* to the developers who worked hard on that work.
>>>
>>> Now this deserves to be well tested, please report back any issues!
>>>
>>>
>>>
>>> 2017-10-04 15:17 GMT+02:00 Anita Graser <anitagraser at gmx.at>:
>>>
>>>>
>>>>
>>>> On Wed, Oct 4, 2017 at 1:23 PM, Régis Haubourg <
>>>> regis.haubourg at gmail.com> wrote:
>>>>
>>>>> Hi
>>>>>
>>>>> Yes, refactoring is now complete! see : https://github.com/qgis/QGIS-E
>>>>> nhancement-Proposals/issues/74#issuecomment-334123595
>>>>>
>>>>> Anita, I'll draft an article tonight if you still agree to review it,
>>>>> that would be great!
>>>>>
>>>>
>>>>
>>>> Sure!
>>>>
>>>> Anita
>>>>
>>>>
>>>>
>>>>
>>>>
>>>
>>
>
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-- 
Alessandro Pasotti
w3:   www.itopen.it
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