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from __future__ import with_statement
import gc
import objgraph
import cProfile
import pstats
import cgi
import pprint
import threading
from StringIO import StringIO
class ProfilingMiddleware(object):
def __init__(self, app):
self.lock = threading.Lock()
self.app = app
def __call__(self, environ, start_response):
with self.lock:
profiler = cProfile.Profile()
def run_app(*a, **kw):
self.response = self.app(environ, start_response)
profiler.runcall(run_app, environ, start_response)
profiler.snapshot_stats()
stats = pstats.Stats(profiler)
stats.sort_stats('calls') #cummulative
# Redirect output
out = StringIO()
stats.stream = out
stats.print_stats()
resp = ''.join(self.response)
# Lets at least only put this on html-like responses.
if resp.strip().startswith('<'):
## The profiling info is just appended to the response.
## Browsers don't mind this.
resp += ('<pre style="text-align:left; '
'border-top: 4px dashed red; padding: 1em;">')
resp += cgi.escape(out.getvalue(), True)
ct = objgraph.show_most_common_types()
print ct
resp += ct if ct else '---'
output = StringIO()
pprint.pprint(environ, output, depth=3)
resp += cgi.escape(output.getvalue(), True)
resp += '</pre>'
return resp
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