On Nov 10, 5:36 am, "Diez B. Roggisch" <[EMAIL PROTECTED]> wrote:
> Dan Arbogast schrieb:
>
> > I'm getting a "500 Internal Error" from a deployment of a simple TG app
> > using apache2/mod_wsgi (port 80) that seems to be directly correlated
> > with an attempt to instantiate a pyserial class.
>
> > Interestingly, if the application is started using the ./start-myapp on
> > port 8080 (as sudo), the pyserial works just grand. This indicates to
> > me it's not a path problem, but probably a permission issue.
>
> > Any guesses on what I may be missing, or how I can troubleshoot this?
> > The apache2 error logs are just telling me I have a 500 internal error,
> > and I haven't found any cherrypy error logs.
>
> That's poor application design. A serial IO line is a singleton. It
> should be acquired once the app starts, and only released on it
> terminating. Or, if anything, based on certain user-actions.
>
> However, apache starts/stops processes at will, potentially interrupting
> serial communication. Additionally, there is no way to share the
> file-descriptors between processes (or at least no easy way..)
>
> So, don't do that. Either delegate your serial communication to an
> external process, governed e.g. by supervisord, communicating with
> xmlrpc. Or use (if you insist on using apache somehow) mod_proxy & keep
> your cherrypy-app running alongside.
Or use mod_wsgi daemon mode and delegate TG application to run in
since mod_wsgi daemon mode process.
As to permissions issues etc, ensure you read:
http://code.google.com/p/modwsgi/wiki/ApplicationIssues
As well as permissions problem, could also relate to fact that under
Apache/mod_wsgi, your user environment variable setup is not used.
Graham
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