Never mind this request. I realized that for what I am doing, the web server was unnecessary. I could just load local HTML files directly into the QWebEngineView with no need of an intermediate server. Thanks anyway, and sorry for the noise!
--- Israel Brewster Software Engineer Alaska Volcano Observatory Geophysical Institute - UAF 2156 Koyukuk Drive Fairbanks AK 99775-7320 Work: 907-474-5172 cell: 907-328-9145 > On Mar 13, 2019, at 1:42 PM, Israel Brewster <ijbrews...@alaska.edu> wrote: > > I’m working on a Qt for python app that needs to run a local web server. For > the web server portion I’m using flask and uWISGI, and at the moment I have > my application launching uWISGI using subprocess before firing off the Qt > QApplication instance and entering the Qt event loop. Some sample code to > illustrate the process: > > If __name__ ==“__main__”: > CUR_DIRECTORY = os.path.dirname(__file__) > > UWSGI_CONFIG = os.path.realpath(os.path.join(CUR_DIRECTORY, 'Other > Files/TROPOMI.ini')) > UWSGI_EXE = os.path.realpath(os.path.join(CUR_DIRECTORY, 'bin/uwsgi')) > uwsgi_proc = subprocess.Popen([UWSGI_EXE, UWSGI_CONFIG]) > > qt_app = QApplication(sys.argv) > …. > res = qt_app.exec_() > > > Now this works, but it strikes me as kinda kludgy, as the uWISGI is > effectively a separate application needed. More to the point, however, it’s a > bit fragile, in that if the main application crashes (really, ANY sort of > unclean exit), you get stray uWISGI processes hanging around that prevent > proper functioning of the app the next time you try to launch it. > Unfortunately as the app is still in early days, this happens occasionally. > So I have two questions: > > 1) Is there a “better way”? This GitHub repo: > https://github.com/unbit/uwsgi-qtloop <https://github.com/unbit/uwsgi-qtloop> > seems to indicate that it should be possible to run a Qt event loop from > within a uWSGI app, thus eliminating the extra “subprocess” spinoff, but it > hasn’t been updated in 5 years and I have been unable to get it to work with > my current Qt/Python/OS setup > > 2) Baring any “better way”, is there a way to at least ensure that the > subprocess is killed in the event of parent death, or alternately to look for > and kill any such lingering processes on application startup? > > P.S. The purpose of running the web server is to be able to load and use > Plotly charts in my app (via a QWebEngineView). So a “better way” may be > using a different plotting library that can essentially “cut out” the middle > man. I’ve tried Matplotlib, but I found its performance to be worse than > Plotly - given the size of my data sets, performance matters. Also I had some > glitches with it when using a lasso selector (plot going black). Still, with > some work, it may be an option. > > --- > Israel Brewster > Software Engineer > Alaska Volcano Observatory > Geophysical Institute - UAF > 2156 Koyukuk Drive > Fairbanks AK 99775-7320 > Work: 907-474-5172 > cell: 907-328-9145 > -- https://mail.python.org/mailman/listinfo/python-list
