Hi all,
I am using Twisted Web WSGIResource to host a Django site. Here's the
code I use to setup the WSGI resource (other boilerplate skipped)
def wsgi_resource():
from django.core.handlers.wsgi import WSGIHandler
pool = threadpool.ThreadPool()
pool.start()
# Allow Ctrl-C to get you out cleanly:
reactor.addSystemEventTrigger('after', 'shutdown', pool.stop)
wsgi_resource = wsgi.WSGIResource(reactor, pool, WSGIHandler())
return wsgi_resource
This generally worked quite well. However I have an API endpoint that
gets hit with multiple POST requests per second (not very much - I'd say
10-20 req/sec at most). Sometimes I see this in the logs:
Internal Server Error: /cas/eventlog/
Traceback (most recent call last):
File "<pythonpath>/site-packages/django/core/handlers/base.py", line
114, in get_response
response = wrapped_callback(request, *callback_args,
**callback_kwargs)
File "<pythonpath>/site-packages/django/views/decorators/csrf.py",
line 57, in wrapped_view
return view_func(*args, **kwargs)
File "<djangoapp>/views.py", line 488, in event_log
data = json.loads(request.body)
File "<pythonpath>/site-packages/django/http/request.py", line 192,
in body
self._body = self.read()
File "<pythonpath>/site-packages/django/http/request.py", line 246,
in read
return self._stream.read(*args, **kwargs)
File "<pythonpath>/site-packages/django/core/handlers/wsgi.py", line
45, in read
result = self.buffer + self._read_limited()
File "<pythonpath>/site-packages/django/core/handlers/wsgi.py", line
39, in _read_limited
result = self.stream.read(size)
File "<pythonpath>/site-packages/twisted/web/wsgi.py", line 94, in
read
return self._wrapped.read(size)
ValueError: I/O operation on closed file.
Any pointers on why would this happen? Why would Twisted close the file
early? Could it be that I need to increase the threadpool size?
I use treq 0.2.0 for the requests, with the "persistent" flag turned on,
if that makes any difference. Twisted 13.2.0 and Django 1.6, python
2.7.1 on OS X 10.7.5.
Many thanks,
Orestis
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