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1 from __future__ import with_statement
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2
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3 import cProfile
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4 import pstats
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5 import cgi
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6 import pprint
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7 import threading
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8
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9 from StringIO import StringIO
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10
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11 class ProfilingMiddleware(object):
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12 def __init__(self, app):
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13 self.lock = threading.Lock()
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14 self.app = app
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15
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16
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17 def __call__(self, environ, start_response):
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18 with self.lock:
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19 profiler = cProfile.Profile()
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20 def run_app(*a, **kw):
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21 self.response = self.app(environ, start_response)
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22
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23 profiler.runcall(run_app, environ, start_response)
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24
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25 profiler.snapshot_stats()
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26
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27 stats = pstats.Stats(profiler)
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28 stats.sort_stats('cumulative')
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29
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30 # Redirect output
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31 out = StringIO()
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32 stats.stream = out
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33
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34 stats.print_stats()
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35
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36 resp = ''.join(self.response)
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37
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38 # Lets at least only put this on html-like responses.
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39 if resp.strip().startswith('<'):
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40 ## The profiling info is just appended to the response.
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41 ## Browsers don't mind this.
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42 resp += '<pre style="text-align:left; border-top: 4px dashed red; padding: 1em;">'
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43 resp += cgi.escape(out.getvalue(), True)
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44
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45 output = StringIO()
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46 pprint.pprint(environ, output, depth=3)
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47
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48 resp += cgi.escape(output.getvalue(), True)
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49 resp += '</pre>'
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50
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51 return resp
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52
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53
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