84 lines
3.5 KiB
Python
84 lines
3.5 KiB
Python
# http://www.no-ack.org/2010/12/yet-another-profiling-middleware-for.html
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import os
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import re
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import tempfile
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from cStringIO import StringIO
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from django.conf import settings
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import hotshot
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import hotshot.stats
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COMMENT_SYNTAX = ((re.compile(r'^application/(.*\+)?xml|text/html$', re.I), '<!--', '-->'),
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(re.compile(r'^application/j(avascript|son)$', re.I), '/*', '*/' ))
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class ProfileMiddleware(object):
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def process_view(self, request, callback, args, kwargs):
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# Create a profile, writing into a temporary file.
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filename = tempfile.mktemp()
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profile = hotshot.Profile(filename)
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try:
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try:
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# Profile the call of the view function.
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response = profile.runcall(callback, request, *args, **kwargs)
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# If we have got a 3xx status code, further
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# action needs to be taken by the user agent
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# in order to fulfill the request. So don't
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# attach any stats to the content, because of
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# the content is supposed to be empty and is
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# ignored by the user agent.
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if response.status_code // 100 == 3:
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return response
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# Detect the appropriate syntax based on the
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# Content-Type header.
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for regex, begin_comment, end_comment in COMMENT_SYNTAX:
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if regex.match(response['Content-Type'].split(';')[0].strip()):
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break
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else:
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# If the given Content-Type is not
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# supported, don't attach any stats to
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# the content and return the unchanged
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# response.
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return response
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# The response can hold an iterator, that
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# is executed when the content property
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# is accessed. So we also have to profile
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# the call of the content property.
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content = profile.runcall(response.__class__.content.fget, response)
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finally:
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profile.close()
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# Load the stats from the temporary file and
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# write them in a human readable format,
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# respecting some optional settings into a
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# StringIO object.
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stats = hotshot.stats.load(filename)
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if getattr(settings, 'PROFILE_MIDDLEWARE_STRIP_DIRS', False):
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stats.strip_dirs()
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if getattr(settings, 'PROFILE_MIDDLEWARE_SORT', None):
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stats.sort_stats(*settings.PROFILE_MIDDLEWARE_SORT)
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stats.stream = StringIO()
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stats.print_stats(*getattr(settings, 'PROFILE_MIDDLEWARE_RESTRICTIONS', []))
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finally:
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os.unlink(filename)
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# Construct an HTML/XML or Javascript comment, with
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# the formatted stats, written to the StringIO object
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# and attach it to the content of the response.
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comment = '\n%s\n\n%s\n\n%s\n' % (begin_comment, stats.stream.getvalue().strip(), end_comment)
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response.content = content + comment
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# If the Content-Length header is given, add the
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# number of bytes we have added to it. If the
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# Content-Length header is ommited or incorrect,
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# it remains so in order to don't change the
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# behaviour of the web server or user agent.
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if response.has_header('Content-Length'):
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response['Content-Length'] = int(response['Content-Length']) + len(comment)
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return response
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