You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
140 lines
4.8 KiB
140 lines
4.8 KiB
"""
|
|
Application Profiler
|
|
====================
|
|
|
|
This module provides a middleware that profiles each request with the
|
|
:mod:`cProfile` module. This can help identify bottlenecks in your code
|
|
that may be slowing down your application.
|
|
|
|
.. autoclass:: ProfilerMiddleware
|
|
|
|
:copyright: 2007 Pallets
|
|
:license: BSD-3-Clause
|
|
"""
|
|
import os.path
|
|
import sys
|
|
import time
|
|
import typing as t
|
|
from pstats import Stats
|
|
|
|
try:
|
|
from cProfile import Profile
|
|
except ImportError:
|
|
from profile import Profile # type: ignore
|
|
|
|
if t.TYPE_CHECKING:
|
|
from _typeshed.wsgi import StartResponse
|
|
from _typeshed.wsgi import WSGIApplication
|
|
from _typeshed.wsgi import WSGIEnvironment
|
|
|
|
|
|
class ProfilerMiddleware:
|
|
"""Wrap a WSGI application and profile the execution of each
|
|
request. Responses are buffered so that timings are more exact.
|
|
|
|
If ``stream`` is given, :class:`pstats.Stats` are written to it
|
|
after each request. If ``profile_dir`` is given, :mod:`cProfile`
|
|
data files are saved to that directory, one file per request.
|
|
|
|
The filename can be customized by passing ``filename_format``. If
|
|
it is a string, it will be formatted using :meth:`str.format` with
|
|
the following fields available:
|
|
|
|
- ``{method}`` - The request method; GET, POST, etc.
|
|
- ``{path}`` - The request path or 'root' should one not exist.
|
|
- ``{elapsed}`` - The elapsed time of the request.
|
|
- ``{time}`` - The time of the request.
|
|
|
|
If it is a callable, it will be called with the WSGI ``environ``
|
|
dict and should return a filename.
|
|
|
|
:param app: The WSGI application to wrap.
|
|
:param stream: Write stats to this stream. Disable with ``None``.
|
|
:param sort_by: A tuple of columns to sort stats by. See
|
|
:meth:`pstats.Stats.sort_stats`.
|
|
:param restrictions: A tuple of restrictions to filter stats by. See
|
|
:meth:`pstats.Stats.print_stats`.
|
|
:param profile_dir: Save profile data files to this directory.
|
|
:param filename_format: Format string for profile data file names,
|
|
or a callable returning a name. See explanation above.
|
|
|
|
.. code-block:: python
|
|
|
|
from werkzeug.middleware.profiler import ProfilerMiddleware
|
|
app = ProfilerMiddleware(app)
|
|
|
|
.. versionchanged:: 0.15
|
|
Stats are written even if ``profile_dir`` is given, and can be
|
|
disable by passing ``stream=None``.
|
|
|
|
.. versionadded:: 0.15
|
|
Added ``filename_format``.
|
|
|
|
.. versionadded:: 0.9
|
|
Added ``restrictions`` and ``profile_dir``.
|
|
"""
|
|
|
|
def __init__(
|
|
self,
|
|
app: "WSGIApplication",
|
|
stream: t.IO[str] = sys.stdout,
|
|
sort_by: t.Iterable[str] = ("time", "calls"),
|
|
restrictions: t.Iterable[t.Union[str, int, float]] = (),
|
|
profile_dir: t.Optional[str] = None,
|
|
filename_format: str = "{method}.{path}.{elapsed:.0f}ms.{time:.0f}.prof",
|
|
) -> None:
|
|
self._app = app
|
|
self._stream = stream
|
|
self._sort_by = sort_by
|
|
self._restrictions = restrictions
|
|
self._profile_dir = profile_dir
|
|
self._filename_format = filename_format
|
|
|
|
def __call__(
|
|
self, environ: "WSGIEnvironment", start_response: "StartResponse"
|
|
) -> t.Iterable[bytes]:
|
|
response_body: t.List[bytes] = []
|
|
|
|
def catching_start_response(status, headers, exc_info=None): # type: ignore
|
|
start_response(status, headers, exc_info)
|
|
return response_body.append
|
|
|
|
def runapp() -> None:
|
|
app_iter = self._app(
|
|
environ, t.cast("StartResponse", catching_start_response)
|
|
)
|
|
response_body.extend(app_iter)
|
|
|
|
if hasattr(app_iter, "close"):
|
|
app_iter.close() # type: ignore
|
|
|
|
profile = Profile()
|
|
start = time.time()
|
|
profile.runcall(runapp)
|
|
body = b"".join(response_body)
|
|
elapsed = time.time() - start
|
|
|
|
if self._profile_dir is not None:
|
|
if callable(self._filename_format):
|
|
filename = self._filename_format(environ)
|
|
else:
|
|
filename = self._filename_format.format(
|
|
method=environ["REQUEST_METHOD"],
|
|
path=environ["PATH_INFO"].strip("/").replace("/", ".") or "root",
|
|
elapsed=elapsed * 1000.0,
|
|
time=time.time(),
|
|
)
|
|
filename = os.path.join(self._profile_dir, filename)
|
|
profile.dump_stats(filename)
|
|
|
|
if self._stream is not None:
|
|
stats = Stats(profile, stream=self._stream)
|
|
stats.sort_stats(*self._sort_by)
|
|
print("-" * 80, file=self._stream)
|
|
path_info = environ.get("PATH_INFO", "")
|
|
print(f"PATH: {path_info!r}", file=self._stream)
|
|
stats.print_stats(*self._restrictions)
|
|
print(f"{'-' * 80}\n", file=self._stream)
|
|
|
|
return [body]
|