[QGIS-Developer] Proxy support in Python Plugins

[Richard Duivenvoorde]

Duh, sent to Nils alone, resending to list ....

@nils: in addition I forgot to tell: please have a look at
https://github.com/rduivenvoorde/qgisnetworklogger a Work in Progress
which will show you all information (url, headers etc) that goes through
QgsNetworkAccessManager and replay it if needed

Regards,

Richard Duivenvoorde


On 31/03/2019 12.08, Richard Duivenvoorde wrote:
> Hi Nils,
> 
> IF you use QgsNetworkAccessManager, you get all proxy and authentication
> stuff for free with it.
> In my plugins I use the Boundless wrapper made by Luigi and Alessandro:
> 
> https://github.com/boundlessgeo/lib-qgis-commons/blob/master/qgiscommons2/network/networkaccessmanager.py
> 
> https://github.com/rduivenvoorde/pdokservicesplugin/blob/master/pdokgeocoder.py#L30
> I just add the Boundless networkaccessmanager to my plugin.
> 
> I know Nyall has tried to make it easier for Python devs to create a
> thread-save non-synchron requests, but if I am correct that became too
> complex/unsafe (Nyall?)
> What was added though (QGIS 3.6) was:
> 
> QgsNetworkAccessManager.blockingGet
> 
> see:
> https://qgis.org/pyqgis/3.6/core/QgsNetworkAccessManager.html#qgis.core.QgsNetworkAccessManager.blockingGet
> 
> Or in use:
> https://github.com/rduivenvoorde/TimeManager/blob/guess_wmst_timeframes/raster/wmstlayer.py#L89
> 
> I think this can be used in your use case.
> 
> Off course you can also create your own use of it, but then indeed you
> have to make yourself very familiar with how Qt handles network requests
> etc.
> 
> Hope this helps.
> 
> Regards,
> 
> Richard
> 
> On 30/03/2019 17.33, Nils Nolde wrote:
>> Hi,
>>
>> I want to upgrade ORS Tools to not work with requests anymore to fetch
>> GET and POST queries. However, I never used QgsNetworkAccessManager and
>> have little knowledge about networking in general. I tried mostly
>> Boundless Geo's NetworkAccessManager wrapper. Couldn't make it work for
>> my plugin. When I set a free online Proxy in QGIS settings, all other
>> apps/plugin in QGIS could access the internet, my plugin couldn't, it
>> would timeout.
>>
>> I did smth akin to:
>>
>> nam = networkaccessmanager.NetworkAccessManager()
>>
>> base_url = 'https://nominatim.openstreetmap.org/reverse'
>> params = {'lat': point.y(), 'lon': point.x(), 'format': 'json'}
>> url = base_url + '?' + urlencode(params)
>>
>> response, content = self.nam.request(url=url, headers={'User-Agent':
>> user_agent}, blocking=False)
>>
>> Figuring it would automatically use the Proxy settings in QGIS. It
>> doesn't, it seems. So 3 questions:
>>
>> 1. How do I make my code use the QGIS proxy settings?
>>
>> 2. How do I debug, i.e. how do I check that the request actually used
>> the proxy settings? Couldn't find much, even on the native Qt parent.
>>
>> 3. Is there a way to use non-blocking requests in native
>> QgsNetworkAccessManager? Actually it's not so important, since batch
>> requests are being done within the Processing framework (assuming that
>> won't affect the main thread..), it's more informational.
>>
>> I did some research, but as I don't find a terrible amount of time
>> lately to maintain all the open source projects, I was hoping to get
>> some quick answer from someone. I'm sure I'm missing smth really
>> obvious. Sorry, if it really is obvious and I just can't see it.. Also,
>> a reference to an existing plugin would suffice.
>>
>> Many thanks
>> Nils
>>
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