[Web-SIG] WSGI uses
ianb at colorstudy.com
Thu Aug 19 06:50:54 CEST 2004
I was playing around with making a WSGI server, and I'm starting to
think that some really neat stuff could be done with middleware.
For instance, I was thinking about setting up something for Medusa with
WSGI. But though I think asynchronous code seems like a good server
architecture, I'm not that interested in it for applications. But this
iteration of the WSGI spec allows for async pretty well; you can tell
you are in that situation when wsgi.multiprocess is false and
wsgi.multithread is false, and the iterator output can produce the data
I then realized that threading itself could be a piece of middleware --
you just have to do the proper buffering with input and output. An
intelligent application that realizes it can't run as an async process
could install this middleware itself when necessary.
Even multiprocess could really be implemented as a piece of middleware,
either running CGI scripts, or forking worker processes. It could get
out of hand if every application in a multi-application system had its
own middleware; but the extension mechanism could also allow you to
lazily implement these models, providing callbacks to access existing
thread or worker process pools.
Another useful piece of middleware would be something for error
reporting; it would basically pass everything through, but wrap
everything in try:except:. Then you could develop and plug a nice
debugger into whatever architecture, and the basic server can do just
the most minimal error logging (basically print a traceback to the error
Anyway, I'm pretty excited about the possibilities.
Ian Bicking / ianb at colorstudy.com / http://blog.ianbicking.org
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