147 lines
5 KiB
Python
147 lines
5 KiB
Python
# -*- coding: utf-8 -*-
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"""
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werkzeug.contrib.profiler
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~~~~~~~~~~~~~~~~~~~~~~~~~
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This module provides a simple WSGI profiler middleware for finding
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bottlenecks in web application. It uses the :mod:`profile` or
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:mod:`cProfile` module to do the profiling and writes the stats to the
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stream provided (defaults to stderr).
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Example usage::
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from werkzeug.contrib.profiler import ProfilerMiddleware
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app = ProfilerMiddleware(app)
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:copyright: (c) 2014 by the Werkzeug Team, see AUTHORS for more details.
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:license: BSD, see LICENSE for more details.
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"""
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import sys
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import time
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import os.path
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try:
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try:
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from cProfile import Profile
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except ImportError:
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from profile import Profile
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from pstats import Stats
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available = True
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except ImportError:
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available = False
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class MergeStream(object):
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"""An object that redirects `write` calls to multiple streams.
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Use this to log to both `sys.stdout` and a file::
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f = open('profiler.log', 'w')
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stream = MergeStream(sys.stdout, f)
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profiler = ProfilerMiddleware(app, stream)
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"""
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def __init__(self, *streams):
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if not streams:
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raise TypeError('at least one stream must be given')
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self.streams = streams
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def write(self, data):
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for stream in self.streams:
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stream.write(data)
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class ProfilerMiddleware(object):
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"""Simple profiler middleware. Wraps a WSGI application and profiles
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a request. This intentionally buffers the response so that timings are
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more exact.
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By giving the `profile_dir` argument, pstat.Stats files are saved to that
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directory, one file per request. Without it, a summary is printed to
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`stream` instead.
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For the exact meaning of `sort_by` and `restrictions` consult the
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:mod:`profile` documentation.
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.. versionadded:: 0.9
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Added support for `restrictions` and `profile_dir`.
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:param app: the WSGI application to profile.
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:param stream: the stream for the profiled stats. defaults to stderr.
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:param sort_by: a tuple of columns to sort the result by.
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:param restrictions: a tuple of profiling strictions, not used if dumping
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to `profile_dir`.
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:param profile_dir: directory name to save pstat files
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"""
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def __init__(self, app, stream=None,
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sort_by=('time', 'calls'), restrictions=(), profile_dir=None):
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if not available:
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raise RuntimeError('the profiler is not available because '
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'profile or pstat is not installed.')
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self._app = app
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self._stream = stream or sys.stdout
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self._sort_by = sort_by
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self._restrictions = restrictions
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self._profile_dir = profile_dir
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def __call__(self, environ, start_response):
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response_body = []
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def catching_start_response(status, headers, exc_info=None):
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start_response(status, headers, exc_info)
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return response_body.append
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def runapp():
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appiter = self._app(environ, catching_start_response)
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response_body.extend(appiter)
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if hasattr(appiter, 'close'):
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appiter.close()
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p = Profile()
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start = time.time()
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p.runcall(runapp)
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body = b''.join(response_body)
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elapsed = time.time() - start
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if self._profile_dir is not None:
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prof_filename = os.path.join(self._profile_dir,
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'%s.%s.%06dms.%d.prof' % (
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environ['REQUEST_METHOD'],
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environ.get('PATH_INFO').strip(
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'/').replace('/', '.') or 'root',
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elapsed * 1000.0,
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time.time()
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))
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p.dump_stats(prof_filename)
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else:
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stats = Stats(p, stream=self._stream)
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stats.sort_stats(*self._sort_by)
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self._stream.write('-' * 80)
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self._stream.write('\nPATH: %r\n' % environ.get('PATH_INFO'))
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stats.print_stats(*self._restrictions)
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self._stream.write('-' * 80 + '\n\n')
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return [body]
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def make_action(app_factory, hostname='localhost', port=5000,
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threaded=False, processes=1, stream=None,
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sort_by=('time', 'calls'), restrictions=()):
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"""Return a new callback for :mod:`werkzeug.script` that starts a local
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server with the profiler enabled.
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::
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from werkzeug.contrib import profiler
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action_profile = profiler.make_action(make_app)
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"""
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def action(hostname=('h', hostname), port=('p', port),
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threaded=threaded, processes=processes):
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"""Start a new development server."""
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from werkzeug.serving import run_simple
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app = ProfilerMiddleware(app_factory(), stream, sort_by, restrictions)
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run_simple(hostname, port, app, False, None, threaded, processes)
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return action
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