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pycallgraph

Author:
roppert
Posted:
February 9, 2009
Language:
Python
Version:
1.0
Tags:
middleware profile debug
Score:
2 (after 2 ratings)

Simple debug middleware that uses pycallgraph to get a visual representation of the call graph, including number of calls and execution times.

Usage:

  1. Replace myapp in the snippet with the name of your application and or adjust include and exclude according to your needs

  2. Add CallgraphMiddleware to your middlewares in settings.py

  3. Append ?prof to any URL in your application to trigger the callgraph creation

Each callgraph cerated will be named callgraph-timestamp.png. This is because multiple callgraphs will be created when a re-direction occurs for example.

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import time
import pycallgraph
from django.conf import settings

class CallgraphMiddleware(object):
    def process_view(self, request, callback, callback_args, callback_kwargs):
        if settings.DEBUG and 'graph' in request.GET:
            filter_func = pycallgraph.GlobbingFilter(include=['myapp.*'],
                    exclude=['myapp.debug.*'])
            pycallgraph.start_trace(filter_func=filter_func)

    def process_response(self, request, response):
        if settings.DEBUG and 'graph' in request.GET:
            pycallgraph.make_dot_graph('callgraph-' + str(time.time()) + '.png')
        return response

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