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In Django, how can I return the time it took to load a page (not the date) in every page of the site, without having to write in every views.py a code similar to the following one?
start = time.time() #model operations loadingpagetime = time.time() - start If using a TEMPLATE_CONTEXT_PROCESSOR is the best option.
How would I get the whole page loading time from there, instead of just getting the template loading time?
UPDATE:
As the initial question doesn't seem to be clear enough, here is an approach of what would be the Python version of what I want to do.
#!/usr/bin/env python import cgitb; cgitb.enable() import time print 'Content-type: text/html\n\n' start = time.time() print '<html>' print '<head>' print '</head>' print '<body>' print '<div>HEADER</div>' print '<div>' print '<p>Welcome to my Django Webpage!</p>' print '<p>Welcome to my Django Webpage!</p>' print '<p>Welcome to my Django Webpage!</p>' print '</div>' time.sleep(3) loadingtime = time.time() - start print '<div>It took ',loadingtime,' seconds to load the page</div>' print '</body>' print '</html>' 
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You can create a custom middleware to log this. Here is how I create a middleware to achieve this purpose base on http://djangosnippets.org/snippets/358/ (I modified the code a bit).
Firstly, assuming your project has a name: test_project, create a file name middlewares.py, I place it in the same folder as settings.py:
from django.db import connection from time import time from operator import add import re class StatsMiddleware(object): def process_view(self, request, view_func, view_args, view_kwargs): ''' In your base template, put this: <div id="stats"> <!-- STATS: Total: %(total_time).2fs Python: %(python_time).2fs DB: %(db_time).2fs Queries: %(db_queries)d ENDSTATS --> </div> ''' # Uncomment the following if you want to get stats on DEBUG=True only #if not settings.DEBUG: # return None # get number of db queries before we do anything n = len(connection.queries) # time the view start = time() response = view_func(request, *view_args, **view_kwargs) total_time = time() - start # compute the db time for the queries just run db_queries = len(connection.queries) - n if db_queries: db_time = reduce(add, [float(q['time']) for q in connection.queries[n:]]) else: db_time = 0.0 # and backout python time python_time = total_time - db_time stats = { 'total_time': total_time, 'python_time': python_time, 'db_time': db_time, 'db_queries': db_queries, } # replace the comment if found if response and response.content: s = response.content regexp = re.compile(r'(?P<cmt><!--\s*STATS:(?P<fmt>.*?)ENDSTATS\s*-->)') match = regexp.search(s) if match: s = (s[:match.start('cmt')] + match.group('fmt') % stats + s[match.end('cmt'):]) response.content = s return response Secondly, modify settings.py to add your middleware:
MIDDLEWARE_CLASSES = ( 'django.middleware.common.CommonMiddleware', 'django.middleware.csrf.CsrfViewMiddleware', # ... your existing middlewares ... # your custom middleware here 'test_project.middlewares.StatsMiddleware', ) Note: you have to add the full path to your middleware class like above, the format is:
<project_name>.<middleware_file_name>.<middleware_class_name> A second note is I added this middleware to the end of the list because I just want to log the template load time alone. If you want to log the load time of templates + all middlewares, please put it in the beginning of MIDDLEWARE_CLASSES list (credits to @Symmitchry).
Back to the main topic, the next step is to modify your base.html or whatever pages you want to log load time, add this:
<div id="stats"> <!-- STATS: Total: %(total_time).2fs Python: %(python_time).2fs DB: %(db_time).2fs Queries: %(db_queries)d ENDSTATS --> </div> Note: you can name the <div id="stats"> and use CSS for that div however you want, but DON'T change the comment <!-- STATS: .... -->. If you want to change it, be sure that you test it against the regex pattern in the created middlewares.py.
Voila, enjoy the statistics.
EDIT:
For those who use CBVs (Class Based Views) a lot, you might have encountered the error ContentNotRenderedError with above solution. Have no fear, here is the fix in middlewares.py:
# replace the comment if found if response: try: # detects TemplateResponse which are not yet rendered if response.is_rendered: rendered_content = response.content else: rendered_content = response.rendered_content except AttributeError: # django < 1.5 rendered_content = response.content if rendered_content: s = rendered_content regexp = re.compile( r'(?P<cmt><!--\s*STATS:(?P<fmt>.*?)ENDSTATS\s*-->)' ) match = regexp.search(s) if match: s = (s[:match.start('cmt')] + match.group('fmt') % stats + s[match.end('cmt'):]) response.content = s return response I got it working with Django 1.6.x, if you have problem with other version of Django, please ping me in comment section.
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