[Pywps-dev] Import qgis.core into PyWPS process
Eduardo Silverio da Silva
eduardosilverio1990 at gmail.com
Thu Jan 5 06:04:56 PST 2017
The reason in using processing.runalg() is to integrate processing
workflows from qgis (that can be exported in Python) and try to publish via
PyWPS.
So the "extract nodes" is only an example for check that this could be done
in WPS.
2017-01-05 11:54 GMT-02:00 Jáchym Čepický <jachym.cepicky at gmail.com>:
> Hi,
>
> I'm afraid, I do not know much about QGIS. I have no clue about how it's
> processing module is organized.
>
> What about using shapely or fiona for this task?
>
> J
>
> Dne 5.1.2017 v 14:40 Eduardo Silverio da Silva napsal(a):
>
>> Problem solved!
>>
>> The problem is that each time that I change the PATHs, the Apache need to
>> be restarted to update the environment variables.
>> Also I realized that only the PYTHONPATH in Windows is not recognized in
>> the way that I have done before (Control Panel>Advanced system
>> settings>Environment Variables), so I needed to put the paths in a archive
>> that my Python could read "C:\Pytho27\paths.pth".
>> Now I can import qgis.core and even the plugin "processing" from qgis.
>>
>> But here is another question: How to run the algorithm Extract Nodes on a
>> local Shapefile?
>>
>> # In my IDLE Python, I do this by typing:
>> from qgis.core import QgsApplication
>> from processing.core.Processing import Processing
>> import processing
>> qgis = QgsApplication([], True)
>> qgis.setPrefixPath('C:/Program Files/QGIS 2.18/apps/qgis', True)
>> qgis.initQgis()
>> Processing.initialize()
>> processing.runalg('qgis:extractnodes', 'C:\river.shp', 'C:\result.shp')
>>
>> # But when I try in PyWPS, the program stops in "Processing.initialize()",
>> then I need to kill the process.
>>
>> Any suggestions?
>>
>> Thanks
>>
>> 2017-01-02 19:54 GMT-02:00 Eduardo Silverio da Silva <
>> eduardosilverio1990 at gmail.com>:
>>
>> Hi,
>>>
>>> The way I configured the path was by accessing: Control Panel > System
>>> and
>>> Security > System > Advanced system settings > Environment Variables...
>>> (Image attached)
>>>
>>> I also have tested with the following code just at the begining of the
>>> code:
>>>
>>> import sys
>>> sys.path.append("C:\Program Files (x86)\QGIS 2.18\bin")
>>> sys.path.append("C:\Program Files (x86)\QGIS 2.18\apps\qgis\bin")
>>> sys.path.append("C:\Program Files (x86)\QGIS 2.18\apps\qgis\python")
>>> sys.path.append("C:\Program Files (x86)\QGIS 2.18\apps\Python27\Lib\site-
>>> packages")
>>> sys.path.append("C:\Program Files (x86)\QGIS
>>> 2.18\apps\qgis\python\plugins"
>>> )
>>>
>>> and I got the same error: "No module named qgis.core".
>>>
>>> Well, thanks by the help!
>>>
>>> Eduardo
>>>
>>> 2017-01-02 18:56 GMT-02:00 Jáchym Čepický <jachym.cepicky at gmail.com>:
>>>
>>> Well,
>>>>
>>>> I have no idea, how you confiured the PYTHONPATH
>>>>
>>>> but try (already proposed)
>>>>
>>>> import sys
>>>> sys.path.append("/path/to/qgis/")
>>>>
>>>> J
>>>>
>>>> Dne 2.1.2017 v 21:54 Eduardo Silverio da Silva napsal(a):
>>>>
>>>> I have checked the GetCapabilities by accessing:
>>>>> http://localhost:8080/cgi-bin/pywps.cgi?service=wps&request=
>>>>> GetCapabilities&version=1.0.0
>>>>> and it is okay. I can even execute the example process "inputs_added".
>>>>>
>>>>> Then a have checked the log messages and the result is:
>>>>>
>>>>> PyWPS [2017-01-02 18:49:34,355] INFO: Setting PYWPS_PROCESSES from
>>>>> configuration file to c:/pywps/pywps_processes
>>>>> PyWPS [2017-01-02 18:49:34,388] WARNING: Could not import processes
>>>>> from
>>>>> 'pywps_processes': ImportError('No module named qgis.core',)
>>>>> PyWPS [2017-01-02 18:49:34,424] INFO: Following processes are imported:
>>>>> ['inputs_added']
>>>>> Traceback (most recent call last):
>>>>> File "C:/pywps\pywps\Wps\__init__.py", line 174, in
>>>>> _init_from_directory
>>>>> [processSources.__name__])
>>>>> File "c:/pywps/pywps_processes\processing.py", line 2, in <module>
>>>>> from qgis.core import *
>>>>> ImportError: No module named qgis.core
>>>>>
>>>>> As we can see, the only process imported was the "input_added", while
>>>>> my
>>>>> other algorithm "processing" gave an ImportError.
>>>>>
>>>>> Eduardo,
>>>>>
>>>>> 2017-01-02 18:42 GMT-02:00 Jáchym Čepický <jachym.cepicky at gmail.com>:
>>>>>
>>>>> Hi,
>>>>>
>>>>>>
>>>>>> first check, if your GetCapabilities response is ok (
>>>>>> http://server/wps?service=wps&request=getcapabilities) - maybe the
>>>>>> plugin
>>>>>> is corrupted (it's not the stablest piece of software).
>>>>>>
>>>>>> Then please one more time: check the error.log of your web server,
>>>>>> there
>>>>>> should be written more - you can pass any exception or error message
>>>>>> either
>>>>>> to the mailing list or share it via pastebin.net or similar service
>>>>>>
>>>>>> J
>>>>>>
>>>>>> Dne 2.1.2017 v 21:38 Eduardo Silverio da Silva napsal(a):
>>>>>>
>>>>>> In my case I am using QGIS 2.18 (x32) and Python 2.7.13 (x32) on
>>>>>> Windows
>>>>>>
>>>>>>> 10, and I have already added the following environment variables:
>>>>>>>
>>>>>>> PYTHONPATH:
>>>>>>> C:\Program Files (x86)\QGIS 2.18\apps\qgis\python
>>>>>>> C:\Program Files (x86)\QGIS 2.18\apps\qgis\python\plugins
>>>>>>> C:\Program Files (x86)\QGIS 2.18\apps\Python27\Lib\site-packages
>>>>>>>
>>>>>>> PATH:
>>>>>>> C:\Program Files (x86)\QGIS 2.18\bin
>>>>>>> C:\Program Files (x86)\QGIS 2.18\apps\qgis\bin
>>>>>>> C:\Python27
>>>>>>> C:\Python27\Scripts
>>>>>>>
>>>>>>> Here is the code where I want to import the classes:
>>>>>>>
>>>>>>> #I would like to use these classes:
>>>>>>> # from qgis.core import *
>>>>>>> # from qgis.gui import *
>>>>>>> # from processing.core.Processing import Processing
>>>>>>> # import processing
>>>>>>>
>>>>>>> from pywps.Process import WPSProcess
>>>>>>> from types import FloatType
>>>>>>>
>>>>>>> class Process(WPSProcess):
>>>>>>> def __init__(self):
>>>>>>> WPSProcess.__init__(self,
>>>>>>> identifier = "processar",
>>>>>>> title = "Title",
>>>>>>> version = "1",
>>>>>>> storeSupported = "false",
>>>>>>> statusSupported = "false",
>>>>>>> abstract = "Abstract")
>>>>>>>
>>>>>>> self.value1 = self.addLiteralInput(identifier = "value1",
>>>>>>> title
>>>>>>> =
>>>>>>> "Input 1", type = FloatType)
>>>>>>> self.value2 = self.addLiteralInput(identifier = "value2",
>>>>>>> title
>>>>>>> =
>>>>>>> "Input 2", type = FloatType)
>>>>>>> self.result = self.addLiteralOutput(identifier = "result",
>>>>>>> title =
>>>>>>> "Result", type = FloatType)
>>>>>>>
>>>>>>> def execute(self):
>>>>>>> # Here I would like to write the necessary code to execute the
>>>>>>> qgis:extractnodes algorithm:
>>>>>>> # processing.runalg('qgis:extractnodes', 'river.shp',
>>>>>>> 'output.shp')
>>>>>>>
>>>>>>> v1 = self.value1.getValue()
>>>>>>> v2 = self.value2.getValue()
>>>>>>> self.result.setValue(v1 + v2)
>>>>>>> return
>>>>>>> --------------------------------------
>>>>>>>
>>>>>>> But even with those PATH variables configured I could not access the
>>>>>>> algorithm via WPS-client plugin.
>>>>>>>
>>>>>>> Regards,
>>>>>>>
>>>>>>>
>>>>>>> 2017-01-02 17:31 GMT-02:00 Salvatore Larosa <lrssvtml at gmail.com>:
>>>>>>>
>>>>>>> Hi,
>>>>>>>
>>>>>>>
>>>>>>>> On Mon, Jan 2, 2017 at 4:31 PM, Eduardo Silverio da Silva <
>>>>>>>> eduardosilverio1990 at gmail.com> wrote:
>>>>>>>>
>>>>>>>> Hello people,
>>>>>>>>
>>>>>>>>
>>>>>>>>> I have a python script that uses some classes from qgis and it runs
>>>>>>>>> correctly in my standalone app (IDLE Python). But when I try to
>>>>>>>>> publish
>>>>>>>>> the
>>>>>>>>> script through PyWPS (3.2.5), the process does not apear in the
>>>>>>>>> list
>>>>>>>>> of
>>>>>>>>> GetCapabilities. I think the problem is with the following imports:
>>>>>>>>>
>>>>>>>>> from qgis.core import *
>>>>>>>>> from qgis.gui import *
>>>>>>>>> from processing.core.Processing import Processing
>>>>>>>>>
>>>>>>>>> When I comment these lines the algorithm is showed.
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> I guess the problem is with your environment variable, you should
>>>>>>>>>
>>>>>>>> add the
>>>>>>>> QGIS python and plugins paths to PYTHONPATH and probably the QGIS
>>>>>>>> lib
>>>>>>>> path
>>>>>>>> to LD_LIBRARY.
>>>>>>>>
>>>>>>>> Also, any error message could be useful in order to get some help
>>>>>>>> from
>>>>>>>> the
>>>>>>>> community. :)
>>>>>>>>
>>>>>>>> Regards,
>>>>>>>> -SL
>>>>>>>>
>>>>>>>>
>>>>>>>> --
>>>>>>>> Salvatore Larosa
>>>>>>>> linkedIn: http://linkedin.com/in/larosasalvatore
>>>>>>>> twitter: @lrssvt
>>>>>>>> skype: s.larosa
>>>>>>>> IRC: lrssvt on freenode
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> pywps-dev mailing list
>>>>>>> pywps-dev at lists.osgeo.org
>>>>>>> http://lists.osgeo.org/mailman/listinfo/pywps-dev
>>>>>>>
>>>>>>>
>>>>>>> --
>>>>>>>
>>>>>> Jachym Cepicky
>>>>>> e-mail: jachym.cepicky at gmail.com
>>>>>> twitter: @jachymc
>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>> --
>>>> Jachym Cepicky
>>>> e-mail: jachym.cepicky at gmail.com
>>>> twitter: @jachymc
>>>>
>>>>
>>>
>>>
>>> --
>>> Eduardo Silverio da Silva
>>> Mestrando em Ciências Geodésicas na Universidade Federal do Paraná
>>> Engenheiro Cartógrafo e Agrimensor
>>> +55 41 99873-6274 <+55%2041%2099873-6274>
>>>
>>>
>>
>>
>>
> --
> Jachym Cepicky
> e-mail: jachym.cepicky at gmail.com
> twitter: @jachymc
>
--
Eduardo Silverio da Silva
Mestrando em Ciências Geodésicas na Universidade Federal do Paraná
Engenheiro Cartógrafo e Agrimensor
+55 41 99873-6274
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