|
|
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 += ('<pre style="text-align:left; '
|
|
|
'border-top: 4px dashed red; padding: 1em;">')
|
|
|
resp += cgi.escape(out.getvalue(), True)
|
|
|
|
|
|
output = StringIO()
|
|
|
pprint.pprint(environ, output, depth=3)
|
|
|
|
|
|
resp += cgi.escape(output.getvalue(), True)
|
|
|
resp += '</pre>'
|
|
|
|
|
|
return resp
|
|
|
|
