How do you you run a Twisted application via Python (instead of via Twisted)?

Question

I am working my way through learning Twisted, and have stumbled across something I\'m not sure I\'m terribly fond of - the \"Twisted Command Prompt\". I am fiddling around

Answer 1

I am successfully using the simple Twisted Web server on Windows for Flask web sites. Are others also successfully using Twisted on Windows, to validate that configuration?

new_app.py

if __name__ == "__main__":
    reactor_args = {}

    def run_twisted_wsgi():
        from twisted.internet import reactor
        from twisted.web.server import Site
        from twisted.web.wsgi import WSGIResource

        resource = WSGIResource(reactor, reactor.getThreadPool(), app)
        site = Site(resource)
        reactor.listenTCP(5000, site)
        reactor.run(**reactor_args)

    if app.debug:
        # Disable twisted signal handlers in development only.
        reactor_args['installSignalHandlers'] = 0
        # Turn on auto reload.
        import werkzeug.serving
        run_twisted_wsgi = werkzeug.serving.run_with_reloader(run_twisted_wsgi)

    run_twisted_wsgi()


old_app.py

if __name__ == "__main__":
    app.run()

Answer 2

I haven't used twisted myself. However, you may try seeing if the twistd is a python file itself. I would take a guess that it is simply managing loading the appropriate twisted libraries from the correct path.

Answer 3

I don't know if it's the best way to do this but what I do is instead of:

application = service.Application("chatserver")
internet.TCPServer(1025, factory).setServiceParent(application)

you can do:

from twisted.internet import reactor
reactor.listenTCP(1025, factory)
reactor.run()

Sumarized if you want to have the two options (twistd and python):

if __name__ == '__main__':
    from twisted.internet import reactor
    reactor.listenTCP(1025, factory)
    reactor.run()
else:
    application = service.Application("chatserver")
    internet.TCPServer(1025, factory).setServiceParent(application)

Hope it helps!

Answer 4

On windows you can create .bat file with your command in it, use full paths, then just click on it to start up.

For example I use:

runfileserver.bat:
C:\program_files\python26\Scripts\twistd.py -y C:\source\python\twisted\fileserver.tac

Answer 5

Don't confuse "Twisted" with "twistd". When you use "twistd", you are running the program with Python. "twistd" is a Python program that, among other things, can load an application from a .tac file (as you're doing here).

The "Twisted Command Prompt" is a Twisted installer-provided convenience to help out people on Windows. All it is doing is setting %PATH% to include the directory containing the "twistd" program. You could run twistd from a normal command prompt if you set your %PATH% properly or invoke it with the full path.

If you're not satisfied with this, perhaps you can expand your question to include a description of the problems you're having when using "twistd".

Answer 6

Maybe one of run or runApp in twisted.scripts.twistd modules will work for you. Please let me know if it does, it will be nice to know!