Added profiling middleware.

middleware/profiling.py

+# Orignal version taken from http://www.djangosnippets.org/snippets/186/
+# Original author: udfalkso
+# Modified by: Shwagroo Team and Gun.io
+ 
+import sys
+import os
+import re
+import hotshot, hotshot.stats
+import tempfile
+import StringIO
+ 
+from django.conf import settings
+ 
+words_re = re.compile( r'\s+' )
+ 
+group_prefix_re = [
+    re.compile( "^.*/django/[^/]+" ),
+    re.compile( "^(.*)/[^/]+$" ), # extract module path
+    re.compile( ".*" ),           # catch strange entries
+]
+ 
+class ProfileMiddleware(object):
+    """
+    Displays hotshot profiling for any view.
+    http://yoursite.com/yourview/?prof
+
+    Add the "prof" key to query string by appending ?prof (or &prof=)
+    and you'll see the profiling results in your browser.
+    It's set up to only be available in django's debug mode, is available for superuser otherwise,
+    but you really shouldn't add this middleware to any production configuration.
+
+    WARNING: It uses hotshot profiler which is not thread safe.
+    """
+    def process_request(self, request):
+        if (settings.DEBUG or request.user.is_superuser) and 'prof' in request.GET: 
+            self.tmpfile = tempfile.mktemp()
+            self.prof = hotshot.Profile(self.tmpfile)
+ 
+    def process_view(self, request, callback, callback_args, callback_kwargs):
+        if (settings.DEBUG or request.user.is_superuser) and 'prof' in request.GET:
+            return self.prof.runcall(callback, request, *callback_args, **callback_kwargs)
+ 
+    def get_group(self, file):
+        for g in group_prefix_re:
+            name = g.findall( file )
+            if name:
+                return name[0]
+ 
+    def get_summary(self, results_dict, sum):
+        list = [ (item[1], item[0]) for item in results_dict.items() ]
+        list.sort( reverse = True )
+        list = list[:40]
+ 
+        res = "      tottime\n"
+        for item in list:
+            res += "%4.1f%% %7.3f %s\n" % ( 100*item[0]/sum if sum else 0, item[0], item[1] )
+ 
+        return res
+ 
+    def summary_for_files(self, stats_str):
+        stats_str = stats_str.split("\n")[5:]
+ 
+        mystats = {}
+        mygroups = {}
+ 
+        sum = 0
+ 
+        for s in stats_str:
+            fields = words_re.split(s);
+            if len(fields) == 7:
+                time = float(fields[2])
+                sum += time
+                file = fields[6].split(":")[0]
+ 
+                if not file in mystats:
+                    mystats[file] = 0
+                mystats[file] += time
+ 
+                group = self.get_group(file)
+                if not group in mygroups:
+                    mygroups[ group ] = 0
+                mygroups[ group ] += time
+ 
+        return "<pre>" + \
+               " ---- By file ----\n\n" + self.get_summary(mystats,sum) + "\n" + \
+               " ---- By group ---\n\n" + self.get_summary(mygroups,sum) + \
+               "</pre>"
+ 
+    def process_response(self, request, response):
+        if (settings.DEBUG or request.user.is_superuser) and 'prof' in request.GET:
+            self.prof.close()
+ 
+            out = StringIO.StringIO()
+            old_stdout = sys.stdout
+            sys.stdout = out
+ 
+            stats = hotshot.stats.load(self.tmpfile)
+            stats.sort_stats('time', 'calls')
+            stats.print_stats()
+ 
+            sys.stdout = old_stdout
+            stats_str = out.getvalue()
+ 
+            if response and response.content and stats_str:
+                response.content = "<pre>" + stats_str + "</pre>"
+ 
+            response.content = "\n".join(response.content.split("\n")[:40])
+ 
+            response.content += self.summary_for_files(stats_str)
+ 
+            os.unlink(self.tmpfile)
+ 
+        return response