superset profiler 源码
superset profiler 代码
文件路径：/superset/utils/profiler.py
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
from typing import Any, Callable
from unittest import mock
from werkzeug.wrappers import Request, Response
try:
from pyinstrument import Profiler
except ModuleNotFoundError:
Profiler = None
class SupersetProfiler: # pylint: disable=too-few-public-methods
"""
WSGI middleware to instrument Superset.
To see the instrumentation for a given page, set `PROFILING=True`
in the config, and append `?_instrument=1` to the page.
"""
def __init__(
self,
app: Callable[[Any, Any], Any],
interval: float = 0.0001,
):
self.app = app
self.interval = interval
@Request.application
def __call__(self, request: Request) -> Response:
if request.args.get("_instrument") != "1":
return Response.from_app(self.app, request.environ)
if Profiler is None:
raise Exception("The module pyinstrument is not installed.")
profiler = Profiler(interval=self.interval)
# call original request
fake_start_response = mock.MagicMock()
with profiler:
self.app(request.environ, fake_start_response)
# return HTML profiling information
return Response(profiler.output_html(), mimetype="text/html")
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