[QGIS-Developer] QGIS Server 3 status

[Anita Graser]

I've extended Régis' draft with some of the more recent information. Please
let me know what you think. I'll try to publish in a couple of days.

-- start --


*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. (
http://blog.qgis.org/2016/02/10/qgis-3-0-plans/)

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:

*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 devs!

*New features*

- 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 thus speed up project loading

- WFS 1.1 support https://github.com/qgis/QGIS/pull/5297

- Full Python bindings for the server API

- Server Services as plugins like providers



*Deep, complex and unrewarding tasks*

- Remove all singleton calls

- Cut all the dependencies to the old QGIS project file parser

- Minimize dependencies to GUI library. Since fonts are necessary to render
maps, totally removing them was not feasable.

*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

- 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!
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