[Twisted-Python] SQLAlchemy and Twisted

[César García]

Guys, now that I see this and the past conversations about SA and Twisted,
and now that I've read some more about the non-blocking concepts, I think
that I'am not doing things the best way

 I am doing this:

1. Twisted  IMAP4 Client to read my mails
2. Inside this client I import a module that contains some funtions that
parse the email via re
3. Also inside the client I import a module that makes a DB connection and
insert the data parsed from those emails, all this via SQL using mapped
tables.

I'm almost sure that I'm breacking the hole twisted concept doing this
thisway , do you guys have any advice for me

Thanks
2010/5/5 Chris Withers <chris at simplistix.co.uk>

> Doug Farrell wrote:
> >
> > I’ve been doing some searching about how to get SQLAlchemy and Twisted
> > working together in a Twisted application.
>
> Short version: to be safe, anything that touches any SQLAlchemy-mapped
> object needs to be run in its own thread. Any query or access of an
> attribute of a mapped object may result in a blocking sql query. (aka:
> twisted doesn't play nice with orms)
>
> > definitive answer. The most promising one I’ve run across concerns
> > running the SQLAlchemy queries in a separate process (rather than a
> > separate thread) and communicating the queries between the Twisted
> > application in one process and the SQLAlchemy application in another.
>
> That seems a little odd.
> What would be the IPC?
> How would the "sqlachemy application" be run?
>
> > 1)      Would the SQLAlchemy process also be a Twisted application with
> > all the queries running as deferreds in the main thread, and blocking?
>
> What do you men by "all the queries"?
>
> > Thanks in advance for any help!
>
> In my case, since most of the app I'm working on is "web requested"
> (either xmlrpc or http), I just agve up and used a good wsgi stack
> (repoze.bfg in my case) and munge other incoming requests into wsgi
> requests.
>
> Twisted's wsgi server runs each request in its own thread, so be it.
>
> cheers,
>
> Chris
>
>
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