from __future__ import with_statement 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('cumulative') # 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 += '
'
                resp += cgi.escape(out.getvalue(), True)

                output = StringIO()
                pprint.pprint(environ, output, depth=3)

                resp += cgi.escape(output.getvalue(), True)
                resp += '
' return resp