librelist archives

Re: [flask] Flask Extension Registry Online

From:

Dan Jacob

Date:

2010-05-09 @ 13:00

I wonder if some kind of signals API might be useful with extensions.
For example, if you have a flaskext.database extension which requires
getting a database connection with each request, you might have code
like this:

@signals.before_request
def connect_db():
    g.db = connect_db()

Alternatively, you might want to attach signals that run at
application start up or shutdown. This would make it easier to hook
extension functionality into your code.

The module-support branch however might be enough to cover at least
some of these cases.

On 9 May 2010 13:13, Armin Ronacher <armin.ronacher@active-4.com> wrote:
> Hi,
>
> The Flask Extension Registry is now online:
>   http://flask.pocoo.org/extensions/
>
> If you have extensions for Flask (modules that add extra functionality),
> then follow this guide to get it enlisted:
>   http://flask.pocoo.org/extensions/creating/
>
>
> Regards,
> Armin
>

Hi,

On 5/9/10 3:00 PM, Dan Jacob wrote:
> @signals.before_request
> def connect_db():
>      g.db = connect_db()
Extensions can already do this:

     from flaskext.sqlalchemy import init_sqlalchemy
     db_session = init_sqlalchemy(app)

And that funciton would do this:

     def init_sqlalchemy(app):
         db_session = make_session(...)
         @app.after_request
         def cleanup(response):
             db_session.remove()
             return response
         return db_session

I don't want to depend on blinker on Flask itself, and I am not sure how 
many problems signals would solve over decorators.


Regards,
Armin