[Web-SIG] WSGI and asyncronous applications support
manlio_perillo at libero.it
Tue Sep 18 13:39:23 CEST 2007
I have read some old posts about asynchronous applications support in WSGI:
Since nginx *does* not supports threads, it is important to add
extensions to WSGI to support asynchronous applications.
There are two solutions:
1) The applications returns something like environ['wsgi_not_yet_done']
and produce its output using the write callable, and the finish
callable when its done
2) The applications calls resume = environ['wsgi.pause_output'](), yield
an empty strings, and then calls resume() to notify the server that
it can call .next() again
1) should be very simple to implement, and it is easy to understand how
to use it.
As an example, we can use some API that calls a callback function when
the result is available:
conn.execute("SELECT * FROM test", query_callback)
2) Can be implemented in mod_wsgi, however my problem is that I can't
figure out how the application can yield some data available after a
callback is called.
Thanks Manlio Perillo
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