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"""
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
"""
from __future__ import annotations
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 in milliseconds.
- ``{time}`` - The time of the request.
If it is a callable, it will be called with the WSGI ``environ`` and
be expected to return a filename string. The ``environ`` dictionary
will also have the ``"werkzeug.profiler"`` key populated with a
dictionary containing the following fields (more may be added in the
future):
- ``{elapsed}`` - The elapsed time of the request in milliseconds.
- ``{time}`` - The time of the request.
: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:: 3.0
Added the ``"werkzeug.profiler"`` key to the ``filename_format(environ)``
parameter with the ``elapsed`` and ``time`` fields.
.. 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] | None = sys.stdout,
sort_by: t.Iterable[str] = ("time", "calls"),
restrictions: t.Iterable[str | int | float] = (),
profile_dir: str | None = 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: 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()
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):
environ["werkzeug.profiler"] = {
"elapsed": elapsed * 1000.0,
"time": time.time(),
}
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]
|
