[QGIS-Developer] Custom processing script instabilities (Nzl_T)
Nazli Turini [BBA]
nazli.turini at broadband-academy.de
Wed Jun 30 02:00:49 PDT 2021
Hi Nyall,
Thank you so much fort he feedback. I have tried to customized the script based on your suggestions and in this step, I have removed the lines with thread-unsafe. Also, I have added to the algorithm the flag which returns the FlagNoThreading flag from an override of the QgsProcessingAlgorithm.flags() method.
Now, the script loop thrigh the features of the region and should create one mbtile for each feature.
However, I still face the issue when I make the 'ZOOM_MAX': 19, processing window vanished and qgis crashed.
The stack traces are reporeted as following:
----------------------------------------------
QObject::thread :
QgsProcessingAlgorithm::runPrepared :
QgsProcessingAlgRunnerTask::run :
PyInit__core :
QgsTask::start :
QThreadPoolPrivate::reset :
QThread::start :
BaseThreadInitThunk :
RtlUserThreadStart :
--------------------------------
Here is my code:
# -*- coding: utf-8 -*-
import platform
import os
from os import makedirs
from shutil import move
from qgis.PyQt.QtCore import QCoreApplication
from PyQt5.QtGui import QColor
from qgis.core import QgsProcessingMultiStepFeedback
from qgis.core import (QgsProcessing,
QgsFeatureSink,
QgsProcessingException,
QgsProcessingAlgorithm,
QgsProcessingParameterFeatureSource,
QgsProcessingParameterFeatureSink,QgsRasterLayer,QgsAbstractPropertyCollection,QgsProject,QgsProcessingContext)
from qgis import processing
from qgis.core import QgsProcessingFeedback
from qgis.core import (QgsProcessingParameterFile,
QgsProcessingParameterString,
)
class crea_mbtiles_MERGIN(QgsProcessingAlgorithm):
# Constants used to refer to parameters and outputs. They will be
# used when calling the algorithm from another algorithm, or when
# calling from the QGIS console.
def tr(self, string):
"""
Returns a translatable string with the self.tr() function.
"""
return QCoreApplication.translate('Processing', string)
def createInstance(self):
# Must return a new copy of your algorithm.
return crea_mbtiles_MERGIN()
def name(self):
"""
Returns the unique algorithm name.
"""
return 'Create Mbtiles'
def displayName(self):
"""
Returns the translated algorithm name.
"""
return self.tr('Create Mbtiles')
def __init__(self):
super().__init__()
def flags(self):
return super().flags() | QgsProcessingAlgorithm.FlagNoThreading
Ausbaugebiet = 'Ausbaugebiet'
Projektnummer= 'Projekt-Nummer'
OUT_FOLDER = 'OUT_FOLDER' # abändern für andere Dateien
def initAlgorithm(self, config=None):
self.addParameter(
QgsProcessingParameterFeatureSource(
self.Ausbaugebiet,
'Ausbaugebiet',
[QgsProcessing.TypeVectorAnyGeometry]
)
)
self.addParameter(
QgsProcessingParameterString(
self.Projektnummer,
'Projekt-Nummer',
optional=False
)
)
self.addParameter(
QgsProcessingParameterFile(
self.OUT_FOLDER,
f'Zentralen MERGIN Ordner',
behavior=QgsProcessingParameterFile.Folder,
defaultValue='V:\99_Planungsdaten\Mergin',
optional=False
)
)
def processAlgorithm(self, parameters, context, model_feedback):
# Use a multi-step feedback, so that individual child algorithm progress reports are adjusted for the
# overall progress through the model
feedback = QgsProcessingMultiStepFeedback(1, model_feedback)
results = {}
outputs = {}
#Input variables
Ausbaugebiet = self.parameterAsSource(
parameters,
self.Ausbaugebiet,
context
)
out_folder: str = self.parameterAsString(
parameters,
self.OUT_FOLDER,
context
)
Projektnummer = self.parameterAsString(
parameters,
self.Projektnummer,
context
)
#create the output folder
output_path = os.path.join(out_folder, Projektnummer)
if not os.path.exists(output_path):
makedirs(output_path)
if feedback.isCanceled():
return {}
#Go through the study region features and create the mbtiles
input_featuresource = self.parameterAsSource(parameters, 'Ausbaugebiet', context)
allfeatures = input_featuresource.getFeatures()
for feature, f in enumerate(allfeatures):
if feedback.isCanceled():
break
if not f.hasGeometry():
sink.addFeature(f,QgsFeatureSink.FastInser)
continue
attrs = f.attributes()
name=attrs[1]
bbox = f.geometry().boundingBox()
bbox_extent = '%f,%f,%f,%f' % (bbox.xMinimum(), bbox.xMaximum(), bbox.yMinimum(), bbox.yMaximum())
alg_params = {
'BACKGROUND_COLOR': QColor(0, 0, 0, 0),
'DPI': 96,
'EXTENT': bbox_extent,
'METATILESIZE': 6,
'QUALITY': 75,
'TILE_FORMAT': 0,
'ZOOM_MAX': 19,
'ZOOM_MIN': 12,
'OUTPUT_FILE': output_path+'\\googlestallite_%s.mbtiles' %(name)
}
google=processing.run('qgis:tilesxyzmbtiles', alg_params,is_child_algorithm=True,context=context, feedback=feedback)
if feedback.isCanceled():
return {}
return results
Thank you so much again and best regards,
Nazli
Nazli Turini
Systemdesignerin GIS
Broadband Academy GmbH | www.broadband-academy.de
Wilhelmsstraße 2 | 34117 Kassel | Fax +49 561 827915 90
Tel. +49 561 827915 55 | nazli.turini at broadband-academy.de
Amtsgericht Stuttgart | HRB 735044 | USt ID: DE 274112225
Geschäftsführer: Oliver Laible, Tobias Tippelt, Dr. Marc Ullrich
Bitte beachten Sie unsere neuen Rufnummern für den Standort Kassel!
-----Ursprüngliche Nachricht-----
Von: QGIS-Developer <qgis-developer-bounces at lists.osgeo.org> Im Auftrag von qgis-developer-request at lists.osgeo.org
Gesendet: Samstag, 26. Juni 2021 21:00
An: qgis-developer at lists.osgeo.org
Betreff: QGIS-Developer Digest, Vol 188, Issue 38
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Today's Topics:
1. Re: Custom processing script instabilities (Nzl_T) (Nyall Dawson)
2. Re: Custom processing script instabilities (Nyall Dawson)
3. Re: Reg: native:clip processing tool error with "Could not
create memory layer" (Nyall Dawson)
----------------------------------------------------------------------
Message: 1
Date: Sat, 26 Jun 2021 16:47:18 +1000
From: Nyall Dawson <nyall.dawson at gmail.com>
To: "Nazli Turini [BBA]" <nazli.turini at broadband-academy.de>
Cc: "qgis-developer at lists.osgeo.org" <qgis-developer at lists.osgeo.org>
Subject: Re: [QGIS-Developer] Custom processing script instabilities
(Nzl_T)
Message-ID:
<CAB28AshdrhFsh___-rY1_TAes7+a=cEs3V2ifmvAgnj3o5heNA at mail.gmail.com>
Content-Type: text/plain; charset="UTF-8"
On Fri, 25 Jun 2021 at 20:14, Nazli Turini [BBA] <nazli.turini at broadband-academy.de> wrote:
>
> Hi Evereybody,
>
> I am facing the same issue.
>
> I am creating a custom processing algorithm in which it loads 1, the google satellite 2. get my study_region.shp file 3. loop through the features in study_region.shp 4. and for each feature create the mbtiles using processing.run('qgis:tilesxyzmbtiles'...)5. Save the result on the predefined folder.
>
> The script runs when the ZOOM_MAX and ZOOM_MIN are 12. When I change
> the ZOOM_MAX to 19, the processing window vanished and qgis crashed.
> Maybe it gets some hint to @ Alexis
Your script uses a lot of thread-unsafe calls. I've marked them below.
You should find alternatives for these, or make sure your algorithm returns the FlagNoThreading flag from an override of the
QgsProcessingAlgorithm.flags() method.
>
> #if Projektnummer.find(SEPARATOR) > 0:
> output_path = os.path.join(out_folder, Projektnummer)
> #Projektnummer = path.basename(Projektnummer)
> # Create folder if not present
> if not os.path.exists(output_path):
> makedirs(output_path)
> #Load the google xyz data
> urlWithParams = 'type=xyz&url=https://mt1.google.com/vt/lyrs%3Ds%26x%3D%7Bx%7D%26y%3D%7By%7D%26z%3D%7Bz%7D&zmax=19&zmin=0'
> rlayer = QgsRasterLayer(urlWithParams, 'Google', 'wms')
> QgsProject.instance().addMapLayer(rlayer, False)
not thread safe -- you CANNOT interact with QgsProject.instance() from a background thread.
> layerTree = iface.layerTreeCanvasBridge().rootGroup()
NOT thread safe -- iface methods should only ever be accessed from the main (gui) thread.
> layerTree.insertChildNode(0, QgsLayerTreeLayer(rlayer))
not thread safe -- the QgsLayerTree classes must be accessed only from the thread which the parent QgsProject belongs to.
> if feedback.isCanceled():
> return {}
>
> input_featuresource = self.parameterAsSource(parameters,
> 'Ausbaugebiet', context)
>
> for feature in input_featuresource.getFeatures():
> attrs = feature.attributes()
> name=attrs[1]
> bbox = feature.geometry().boundingBox()
> bbox_extent = '%f,%f,%f,%f' % (bbox.xMinimum(), bbox.xMaximum(), bbox.yMinimum(), bbox.yMaximum())
> alg_params = {
> 'BACKGROUND_COLOR': QColor(0, 0, 0, 0),
> 'DPI': 300,
> 'EXTENT': bbox_extent,
> 'METATILESIZE': 6,
> 'QUALITY': 75,
> 'TILE_FORMAT': 0,
> 'ZOOM_MAX': 12,
> 'ZOOM_MIN': 12,
> 'OUTPUT_FILE': output_path+'/googlestallite_%s.mbtiles' %(name)
> }
> google=processing.run('qgis:tilesxyzmbtiles', alg_params,is_child_algorithm=True,context=context, feedback=feedback)['OUTPUT_FILE']
> # Check for cancelation
> if feedback.isCanceled():
> return {}
> #Remove the layer
> QgsProject.instance().removeMapLayers([rlayer.id()])
Again, not thread safe.
Hope that helps!
Nyall
> del rlayer
> return result
>
> Thank you so much and best regards,
> Nazli
>
> -----Urspr?ngliche Nachricht-----
> Von: QGIS-Developer <qgis-developer-bounces at lists.osgeo.org> Im
> Auftrag von qgis-developer-request at lists.osgeo.org
> Gesendet: Freitag, 25. Juni 2021 09:15
> An: qgis-developer at lists.osgeo.org
> Betreff: QGIS-Developer Digest, Vol 188, Issue 36
>
> Send QGIS-Developer mailing list submissions to
> qgis-developer at lists.osgeo.org
>
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> or, via email, send a message with subject or body 'help' to
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>
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>
>
> Today's Topics:
>
> 1. Custom processing script instabilities (Alexis R.L.)
> 2. Re: Custom processing script instabilities (Luigi Pirelli)
> 3. Re: Custom processing script instabilities (Alexis R.L.)
> 4. Re: Custom processing script instabilities (Luigi Pirelli)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 24 Jun 2021 15:50:54 -0400
> From: "Alexis R.L." <alroyliz0 at gmail.com>
> To: qgis-developer <qgis-developer at lists.osgeo.org>
> Subject: [QGIS-Developer] Custom processing script instabilities
> Message-ID:
>
> <CAOM0XWDiy-WUXQrL4fEFXKxUyzBb-K9Mix3kBTRwK4nnRAhHww at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Greetings,
>
> I have one custom script that uses PIL to get the exif tag, and when I execute the script for the first time, the processing window vanishes and qgis stall and then crashes.
>
> To get it to run properly I had to set the return before opening the files with PIL to run a neutered version and then subsequent runs were flawless during that qgis instance.
>
> I ended up using a standalone exif reader, though slower , but there are no more crashes.
>
> Has anyone else had similar issues and is anyone aware of a way to prevent such crashes or handle them more gracefully, as no trace is left currently.
>
> Thanks and have a nice day,
>
> Alex
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> ------------------------------
>
> Message: 2
> Date: Thu, 24 Jun 2021 22:34:01 +0200
> From: Luigi Pirelli <luipir at gmail.com>
> To: "Alexis R.L." <alroyliz0 at gmail.com>
> Cc: qgis-developer <qgis-developer at lists.osgeo.org>
> Subject: Re: [QGIS-Developer] Custom processing script instabilities
> Message-ID:
>
> <CAFO80_qOK0pBn1KajrPN0paAF=+SrsObeLs=QGqoY_vs=Oq3XQ at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> hard to say something without reading the code... btw generally you do not have to interact with main GUi from a processing alg that by default run in a separated thread => this can cause crash if you do not use standard processing libs (e.g. feedback) to send message to the user.
> No idea if this could be the source of the problem., IMHO sharing the code would help and also help to verify if it can be replicable.
>
> regards
>
> Luigi Pirelli
>
> **********************************************************************
> ****************************
> * LinkedIn: https://www.linkedin.com/in/luigipirelli
> * Stackexchange:
> http://gis.stackexchange.com/users/19667/luigi-pirelli
> * GitHub: https://github.com/luipir
> * Book: Mastering QGIS3 - 3rd Edition
> <https://www.packtpub.com/eu/application-development/mastering-geospat
> ial-development-qgis-3x-third-edition>
> * Hire a team: http://www.qcooperative.net
> **********************************************************************
> ****************************
>
>
> On Thu, 24 Jun 2021 at 21:51, Alexis R.L. <alroyliz0 at gmail.com> wrote:
>
> > Greetings,
> >
> > I have one custom script that uses PIL to get the exif tag, and when
> > I execute the script for the first time, the processing window
> > vanishes and qgis stall and then crashes.
> >
> > To get it to run properly I had to set the return before opening the
> > files with PIL to run a neutered version and then subsequent runs
> > were flawless during that qgis instance.
> >
> > I ended up using a standalone exif reader, though slower , but there
> > are no more crashes.
> >
> > Has anyone else had similar issues and is anyone aware of a way to
> > prevent such crashes or handle them more gracefully, as no trace is left currently.
> >
> > Thanks and have a nice day,
> >
> > Alex
> > _______________________________________________
> > QGIS-Developer mailing list
> > QGIS-Developer at lists.osgeo.org
> > List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer
> > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer
> >
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>
> ------------------------------
>
> Message: 3
> Date: Thu, 24 Jun 2021 17:05:09 -0400
> From: "Alexis R.L." <alroyliz0 at gmail.com>
> To: Luigi Pirelli <luipir at gmail.com>
> Cc: qgis-developer <qgis-developer at lists.osgeo.org>
> Subject: Re: [QGIS-Developer] Custom processing script instabilities
> Message-ID:
>
> <CAOM0XWB22aCNvEZ8O04yi-VATkjotqN_rHJ26rBpGC87Asv7BA at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Greetings Luigi,
>
> There were no interaction, I used glob to gather all the images in a folder, used Image.Open and then used _getexif(). But returning before this part was the only way to get a stable first run.
>
> Sadly I can share the code (work and IP).
>
> The rest of it looped through datapoints and correlated the images to the points using the exif timestamp and the geolocalisation.
>
> Alex
>
> Le jeu. 24 juin 2021 ? 16:34, Luigi Pirelli <luipir at gmail.com> a ?crit :
>
> > hard to say something without reading the code... btw generally you
> > do not have to interact with main GUi from a processing alg that by
> > default run in a separated thread => this can cause crash if you do
> > not use standard processing libs (e.g. feedback) to send message to the user.
> > No idea if this could be the source of the problem., IMHO sharing
> > the code would help and also help to verify if it can be replicable.
> >
> > regards
> >
> > Luigi Pirelli
> >
> >
> > ********************************************************************
> > **
> > ****************************
> > * LinkedIn: https://www.linkedin.com/in/luigipirelli
> > * Stackexchange:
> > http://gis.stackexchange.com/users/19667/luigi-pirelli
> > * GitHub: https://github.com/luipir
> > * Book: Mastering QGIS3 - 3rd Edition
> > <https://www.packtpub.com/eu/application-development/mastering-geosp
> > at
> > ial-development-qgis-3x-third-edition>
> > * Hire a team: http://www.qcooperative.net
> >
> > ********************************************************************
> > **
> > ****************************
> >
> >
> > On Thu, 24 Jun 2021 at 21:51, Alexis R.L. <alroyliz0 at gmail.com> wrote:
> >
> >> Greetings,
> >>
> >> I have one custom script that uses PIL to get the exif tag, and
> >> when I execute the script for the first time, the processing window
> >> vanishes and qgis stall and then crashes.
> >>
> >> To get it to run properly I had to set the return before opening
> >> the files with PIL to run a neutered version and then subsequent
> >> runs were flawless during that qgis instance.
> >>
> >> I ended up using a standalone exif reader, though slower , but
> >> there are no more crashes.
> >>
> >> Has anyone else had similar issues and is anyone aware of a way to
> >> prevent such crashes or handle them more gracefully, as no trace is
> >> left currently.
> >>
> >> Thanks and have a nice day,
> >>
> >> Alex
> >> _______________________________________________
> >> QGIS-Developer mailing list
> >> QGIS-Developer at lists.osgeo.org
> >> List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer
> >> Unsubscribe:
> >> https://lists.osgeo.org/mailman/listinfo/qgis-developer
> >>
> >
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>
> ------------------------------
>
> Message: 4
> Date: Fri, 25 Jun 2021 09:14:43 +0200
> From: Luigi Pirelli <luipir at gmail.com>
> To: "Alexis R.L." <alroyliz0 at gmail.com>
> Cc: qgis-developer <qgis-developer at lists.osgeo.org>
> Subject: Re: [QGIS-Developer] Custom processing script instabilities
> Message-ID:
>
> <CAFO80_oh3NPcZE9oOaoB+0+FfhGLrKU74t71+PsYGXCw=736dw at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> strange that a library call exit, so I would inspect if the lib faces a raise condition. I would check the code outside qgis checking if it terminates for some reason.
>
> Luigi Pirelli
>
> **********************************************************************
> ****************************
> * LinkedIn: https://www.linkedin.com/in/luigipirelli
> * Stackexchange:
> http://gis.stackexchange.com/users/19667/luigi-pirelli
> * GitHub: https://github.com/luipir
> * Book: Mastering QGIS3 - 3rd Edition
> <https://www.packtpub.com/eu/application-development/mastering-geospat
> ial-development-qgis-3x-third-edition>
> * Hire a team: http://www.qcooperative.net
> **********************************************************************
> ****************************
>
>
> On Thu, 24 Jun 2021 at 23:05, Alexis R.L. <alroyliz0 at gmail.com> wrote:
>
> > Greetings Luigi,
> >
> > There were no interaction, I used glob to gather all the images in a
> > folder, used Image.Open and then used _getexif(). But returning
> > before this part was the only way to get a stable first run.
> >
> > Sadly I can share the code (work and IP).
> >
> > The rest of it looped through datapoints and correlated the images
> > to the points using the exif timestamp and the geolocalisation.
> >
> > Alex
> >
> > Le jeu. 24 juin 2021 ? 16:34, Luigi Pirelli <luipir at gmail.com> a ?crit :
> >
> >> hard to say something without reading the code... btw generally you
> >> do not have to interact with main GUi from a processing alg that by
> >> default run in a separated thread => this can cause crash if you do
> >> not use standard processing libs (e.g. feedback) to send message to the user.
> >> No idea if this could be the source of the problem., IMHO sharing
> >> the code would help and also help to verify if it can be replicable.
> >>
> >> regards
> >>
> >> Luigi Pirelli
> >>
> >>
> >> *******************************************************************
> >> **
> >> *****************************
> >> * LinkedIn: https://www.linkedin.com/in/luigipirelli
> >> * Stackexchange:
> >> http://gis.stackexchange.com/users/19667/luigi-pirelli
> >> * GitHub: https://github.com/luipir
> >> * Book: Mastering QGIS3 - 3rd Edition
> >> <https://www.packtpub.com/eu/application-development/mastering-geos
> >> pa
> >> tial-development-qgis-3x-third-edition>
> >> * Hire a team: http://www.qcooperative.net
> >>
> >> *******************************************************************
> >> **
> >> *****************************
> >>
> >>
> >> On Thu, 24 Jun 2021 at 21:51, Alexis R.L. <alroyliz0 at gmail.com> wrote:
> >>
> >>> Greetings,
> >>>
> >>> I have one custom script that uses PIL to get the exif tag, and
> >>> when I execute the script for the first time, the processing
> >>> window vanishes and qgis stall and then crashes.
> >>>
> >>> To get it to run properly I had to set the return before opening
> >>> the files with PIL to run a neutered version and then subsequent
> >>> runs were flawless during that qgis instance.
> >>>
> >>> I ended up using a standalone exif reader, though slower , but
> >>> there are no more crashes.
> >>>
> >>> Has anyone else had similar issues and is anyone aware of a way to
> >>> prevent such crashes or handle them more gracefully, as no trace
> >>> is left currently.
> >>>
> >>> Thanks and have a nice day,
> >>>
> >>> Alex
> >>> _______________________________________________
> >>> QGIS-Developer mailing list
> >>> QGIS-Developer at lists.osgeo.org
> >>> List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer
> >>> Unsubscribe:
> >>> https://lists.osgeo.org/mailman/listinfo/qgis-developer
> >>>
> >>
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------------------------------
Message: 2
Date: Sat, 26 Jun 2021 16:49:35 +1000
From: Nyall Dawson <nyall.dawson at gmail.com>
To: "Alexis R.L." <alroyliz0 at gmail.com>
Cc: qgis-developer <qgis-developer at lists.osgeo.org>
Subject: Re: [QGIS-Developer] Custom processing script instabilities
Message-ID:
<CAB28AshG1xxNV6MF5QraJEDf1x3nzhwkr0Zm7vtDUnAP-9LyxA at mail.gmail.com>
Content-Type: text/plain; charset="UTF-8"
On Fri, 25 Jun 2021 at 05:51, Alexis R.L. <alroyliz0 at gmail.com> wrote:
>
> Greetings,
>
> I have one custom script that uses PIL to get the exif tag, and when I execute the script for the first time, the processing window vanishes and qgis stall and then crashes.
>
> To get it to run properly I had to set the return before opening the files with PIL to run a neutered version and then subsequent runs were flawless during that qgis instance.
>
> I ended up using a standalone exif reader, though slower , but there are no more crashes.
You can use the GDAL python library and retrieve exif metadata via a call to GDALGetMetadata. This has the benefit of being available EVERYWHERE qgis is available, with no added dependencies!
Nyall
>
> Has anyone else had similar issues and is anyone aware of a way to prevent such crashes or handle them more gracefully, as no trace is left currently.
>
> Thanks and have a nice day,
>
> Alex
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------------------------------
Message: 3
Date: Sat, 26 Jun 2021 16:50:17 +1000
From: Nyall Dawson <nyall.dawson at gmail.com>
To: Prem Kumar <prem.netgis at gmail.com>
Cc: qgis-developer <qgis-developer at lists.osgeo.org>
Subject: Re: [QGIS-Developer] Reg: native:clip processing tool error
with "Could not create memory layer"
Message-ID:
<CAB28Asj3pU+a90C-Xb3BP0_CYNgX1rsfyZRjCyxJ1ij_naJ7=A at mail.gmail.com>
Content-Type: text/plain; charset="UTF-8"
On Fri, 25 Jun 2021 at 21:56, Prem Kumar <prem.netgis at gmail.com> wrote:
>
> Hi Team,
>
> I am trying to run a script which initially clips certain data and then outputs an in-memory clipped layer that will be used further in the code on the linux machine.
>
> The script used to work perfectly fine on both Windows and Linux machines, however, only linux machines below errors are seen off late saying output in-memory layer is not created. Suspected disk space availability issue but it is not. Any thoughts to troubleshoot would be appreciated. Thanks.
You'll need to share your script for any meaningful replies. Are you able to do this?
Nyall
>
>
> Regards,
> Prem
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