Hi Giovanni, thanks for the pointer. When I use multiprocessing.Process instead of threading.Thread I get:
PicklingError: Can't pickle <function webserver at 0x1622F330>: it's not found as __main__.webserver This is probably related to: https://docs.python.org/2/library/multiprocessing.html#windows So I am not sure how one would use multiprocessing from a processing script rather than from the __main__ python program. -Andreas On Sun, May 21, 2017 at 8:45 AM, G. Allegri <[email protected]> wrote: > Side note: multiprocessing is part of the Python standard library. > https://docs.python.org/2.7/library/multiprocessing.html > > Giovanni > > Il 21 mag 2017 14:18, "Andreas Plesch" <[email protected]> ha > scritto: > >> As a followup, here is the simple processing script which is my attempt >> at launching a separate task: >> >> https://github.com/andreasplesch/QGIS-X3D-Processing/blob/ >> master/scripts/launch_webserver.py >> >> qgis2web does not seem to need a real http server for the preview as >> openlayers apparently can use the file protocol. >> >> -Andreas >> >> On Sat, May 20, 2017 at 5:29 PM, Andreas Plesch <[email protected]> >> wrote: >> >>> I would like to launch a minimal web server from a processing script to >>> serve html properly (rather than using the file protocol). >>> >>> Since the web server needs to run and keep running separately from qgis >>> or the qgis python interpreter, I investigated various ways to accomplish >>> this using SimpleHTTPServer. On windows 2.18.7 as linux should be more >>> robust. >>> >>> - threading.Threat : start() works until the server actually serves a >>> file. Then qgis crashes with a minidump . For some reason, the crashing >>> happens not always but more often than not. >>> - multiprocessing : seems to be the recommended solution but I do not >>> seem to have it with Qgis python (?) >>> - QProcess.start() : works from the python terminal, seems robust but >>> does not seem to work from a processing script (?). Would be the preferred >>> solution. >>> - QProcess.startDetached('python',(args),dir) : works reliably but >>> requires killing and restarting the process to change the root directory >>> served >>> >>> This may all change with Qgis 3 but I suspect 2.18 will be around for a >>> while, too. >>> >>> Any recommendations or ideas would be welcome. >>> >>> I will look into qgis2web to see what it does. >>> >>> -- >>> Andreas Plesch >>> 39 Barbara Rd. >>> Waltham, MA 02453 >>> >> >> >> >> -- >> Andreas Plesch >> 39 Barbara Rd. >> Waltham, MA 02453 >> >> _______________________________________________ >> QGIS-Developer mailing list >> [email protected] >> List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer >> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer >> > -- Andreas Plesch 39 Barbara Rd. Waltham, MA 02453
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