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At work I'm not allowed to use perl for web services. Python is allowed however.
What I need to do is serve up the results of some very slow c++ binaries. Each exe takes up to 20 seconds to run. In perl I'd just use mojolicious's non blocking event loop ( an example.of which is given here. http://blogs.perl.org/users/joel_berger/2014/01/writing-non-blocking-applications-with-mojolicious-part-3.html )
How would one go about doing this with django and python?
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Django uses asyncio. iscoroutinefunction to test if your view is asynchronous or not. If you implement your own method of returning a coroutine, ensure you set the _is_coroutine attribute of the view to asyncio. coroutines.
Also, this method won't technically be non-blocking as Django is not a non-blocking framework in most deployments, but it will let you do something after returning a response. Tornado will let you perform non-blocking requests.
Latest version of the popular Python web framework also provides an asynchronous interface for all data access operations. Django 4.1, a new version of the major Python-based web framework, adds capabilities such as asynchronous handlers and an ORM interface but also makes some backward-incompatible changes.
http import HttpResponse async def index(request): return HttpResponse("Hello, async Django!") Creating async views in Django is as simple as creating a synchronous view -- all you need to do is add the async keyword. The --reload flag tells Uvicorn to watch your files for changes and reload if it finds any.
Tornado using non blocking IO , the concepts are the same as in perl or node js event loop, multiple tasks per thread and so on.
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Probably won't be possible with Django, as the entire framework will need to be built specifically for running inside an event loop. In an event-driven framework, slow operations (I/O for example) needs to be implemented using callbacks, so that the actual I/O can be offloaded to the event loop itself, and the callback only called when the operation has finished; Django is not implemented like this.
Take a look at Twisted — it is an event-driven networking engine for Python that also has some web application frameworks built on top of it.
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