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Rename web framework packages from "ext" to "instrumentation" (#961)

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Leighton Chen
2020-08-03 10:10:45 -07:00
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# Changelog
## Unreleased
- Change package name to opentelemetry-instrumentation-flask
([#961](https://github.com/open-telemetry/opentelemetry-python/pull/961))
- Update environment variable names, prefix changed from `OPENTELEMETRY` to `OTEL` ([#904](https://github.com/open-telemetry/opentelemetry-python/pull/904))
## Version 0.11b0
- Use one general exclude list instead of two ([#872](https://github.com/open-telemetry/opentelemetry-python/pull/872))
## 0.7b1
Released 2020-05-12
- Add exclude list for paths and hosts
([#630](https://github.com/open-telemetry/opentelemetry-python/pull/630))
## 0.6b0
Released 2020-03-30
- Add an entry_point to be usable in auto-instrumentation
([#327](https://github.com/open-telemetry/opentelemetry-python/pull/327))
## 0.4a0
Released 2020-02-21
- Use string keys for WSGI environ values
([#366](https://github.com/open-telemetry/opentelemetry-python/pull/366))
## 0.3a0
Released 2019-12-11
- Initial release

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graft src
graft tests
global-exclude *.pyc
global-exclude *.pyo
global-exclude __pycache__/*
include CHANGELOG.md
include MANIFEST.in
include README.rst
include LICENSE

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OpenTelemetry Flask Tracing
===========================
|pypi|
.. |pypi| image:: https://badge.fury.io/py/opentelemetry-instrumentation-flask.svg
:target: https://pypi.org/project/opentelemetry-instrumentation-flask/
This library builds on the OpenTelemetry WSGI middleware to track web requests
in Flask applications.
Installation
------------
::
pip install opentelemetry-instrumentation-flask
Configuration
-------------
Exclude lists
*************
To exclude certain URLs from being tracked, set the environment variable ``OTEL_PYTHON_FLASK_EXCLUDED_URLS`` with comma delimited regexes representing which URLs to exclude.
For example,
::
export OTEL_PYTHON_FLASK_EXCLUDED_URLS="client/.*/info,healthcheck"
will exclude requests such as ``https://site/client/123/info`` and ``https://site/xyz/healthcheck``.
References
----------
* `OpenTelemetry Flask Instrumentation <https://opentelemetry-python.readthedocs.io/en/latest/instrumentation/flask/flask.html>`_
* `OpenTelemetry Project <https://opentelemetry.io/>`_

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# Copyright The OpenTelemetry Authors
#
# Licensed 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.
#
[metadata]
name = opentelemetry-instrumentation-flask
description = Flask instrumentation for OpenTelemetry
long_description = file: README.rst
long_description_content_type = text/x-rst
author = OpenTelemetry Authors
author_email = cncf-opentelemetry-contributors@lists.cncf.io
url = https://github.com/open-telemetry/opentelemetry-python/tree/master/instrumentation/opentelemetry-instrumentation-flask
platforms = any
license = Apache-2.0
classifiers =
Development Status :: 4 - Beta
Intended Audience :: Developers
License :: OSI Approved :: Apache Software License
Programming Language :: Python
Programming Language :: Python :: 3
Programming Language :: Python :: 3.4
Programming Language :: Python :: 3.5
Programming Language :: Python :: 3.6
Programming Language :: Python :: 3.7
Programming Language :: Python :: 3.8
[options]
python_requires = >=3.4
package_dir=
=src
packages=find_namespace:
install_requires =
flask ~= 1.0
opentelemetry-instrumentation-wsgi == 0.12.dev0
opentelemetry-instrumentation == 0.12.dev0
opentelemetry-api == 0.12.dev0
[options.extras_require]
test =
flask~=1.0
opentelemetry-test == 0.12.dev0
[options.packages.find]
where = src

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# Copyright The OpenTelemetry Authors
#
# Licensed 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.
import os
import setuptools
BASE_DIR = os.path.dirname(__file__)
VERSION_FILENAME = os.path.join(
BASE_DIR, "src", "opentelemetry", "instrumentation", "flask", "version.py"
)
PACKAGE_INFO = {}
with open(VERSION_FILENAME) as f:
exec(f.read(), PACKAGE_INFO)
setuptools.setup(
version=PACKAGE_INFO["__version__"],
entry_points={
"opentelemetry_instrumentor": [
"flask = opentelemetry.instrumentation.flask:FlaskInstrumentor"
]
},
)

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# Copyright The OpenTelemetry Authors
#
# Licensed 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.
# Note: This package is not named "flask" because of
# https://github.com/PyCQA/pylint/issues/2648
"""
This library builds on the OpenTelemetry WSGI middleware to track web requests
in Flask applications. In addition to opentelemetry-instrumentation-wsgi, it supports
flask-specific features such as:
* The Flask endpoint name is used as the Span name.
* The ``http.route`` Span attribute is set so that one can see which URL rule
matched a request.
Usage
-----
.. code-block:: python
from flask import Flask
from opentelemetry.instrumentation.flask import FlaskInstrumentor
app = Flask(__name__)
FlaskInstrumentor().instrument_app(app)
@app.route("/")
def hello():
return "Hello!"
if __name__ == "__main__":
app.run(debug=True)
API
---
"""
from logging import getLogger
import flask
import opentelemetry.instrumentation.wsgi as otel_wsgi
from opentelemetry import configuration, context, propagators, trace
from opentelemetry.instrumentation.flask.version import __version__
from opentelemetry.instrumentation.instrumentor import BaseInstrumentor
from opentelemetry.util import ExcludeList, time_ns
_logger = getLogger(__name__)
_ENVIRON_STARTTIME_KEY = "opentelemetry-flask.starttime_key"
_ENVIRON_SPAN_KEY = "opentelemetry-flask.span_key"
_ENVIRON_ACTIVATION_KEY = "opentelemetry-flask.activation_key"
_ENVIRON_TOKEN = "opentelemetry-flask.token"
def get_excluded_urls():
urls = configuration.Configuration().FLASK_EXCLUDED_URLS or []
if urls:
urls = str.split(urls, ",")
return ExcludeList(urls)
_excluded_urls = get_excluded_urls()
def _rewrapped_app(wsgi_app):
def _wrapped_app(environ, start_response):
# We want to measure the time for route matching, etc.
# In theory, we could start the span here and use
# update_name later but that API is "highly discouraged" so
# we better avoid it.
environ[_ENVIRON_STARTTIME_KEY] = time_ns()
def _start_response(status, response_headers, *args, **kwargs):
if not _excluded_urls.url_disabled(flask.request.url):
span = flask.request.environ.get(_ENVIRON_SPAN_KEY)
if span:
otel_wsgi.add_response_attributes(
span, status, response_headers
)
else:
_logger.warning(
"Flask environ's OpenTelemetry span "
"missing at _start_response(%s)",
status,
)
return start_response(status, response_headers, *args, **kwargs)
return wsgi_app(environ, _start_response)
return _wrapped_app
def _before_request():
if _excluded_urls.url_disabled(flask.request.url):
return
environ = flask.request.environ
span_name = flask.request.endpoint or otel_wsgi.get_default_span_name(
environ
)
token = context.attach(
propagators.extract(otel_wsgi.get_header_from_environ, environ)
)
tracer = trace.get_tracer(__name__, __version__)
attributes = otel_wsgi.collect_request_attributes(environ)
if flask.request.url_rule:
# For 404 that result from no route found, etc, we
# don't have a url_rule.
attributes["http.route"] = flask.request.url_rule.rule
span = tracer.start_span(
span_name,
kind=trace.SpanKind.SERVER,
attributes=attributes,
start_time=environ.get(_ENVIRON_STARTTIME_KEY),
)
activation = tracer.use_span(span, end_on_exit=True)
activation.__enter__()
environ[_ENVIRON_ACTIVATION_KEY] = activation
environ[_ENVIRON_SPAN_KEY] = span
environ[_ENVIRON_TOKEN] = token
def _teardown_request(exc):
if _excluded_urls.url_disabled(flask.request.url):
return
activation = flask.request.environ.get(_ENVIRON_ACTIVATION_KEY)
if not activation:
_logger.warning(
"Flask environ's OpenTelemetry activation missing"
"at _teardown_flask_request(%s)",
exc,
)
return
if exc is None:
activation.__exit__(None, None, None)
else:
activation.__exit__(
type(exc), exc, getattr(exc, "__traceback__", None)
)
context.detach(flask.request.environ.get(_ENVIRON_TOKEN))
class _InstrumentedFlask(flask.Flask):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self._original_wsgi_ = self.wsgi_app
self.wsgi_app = _rewrapped_app(self.wsgi_app)
self.before_request(_before_request)
self.teardown_request(_teardown_request)
class FlaskInstrumentor(BaseInstrumentor):
# pylint: disable=protected-access,attribute-defined-outside-init
"""An instrumentor for flask.Flask
See `BaseInstrumentor`
"""
def _instrument(self, **kwargs):
self._original_flask = flask.Flask
flask.Flask = _InstrumentedFlask
def instrument_app(self, app): # pylint: disable=no-self-use
if not hasattr(app, "_is_instrumented"):
app._is_instrumented = False
if not app._is_instrumented:
app._original_wsgi_app = app.wsgi_app
app.wsgi_app = _rewrapped_app(app.wsgi_app)
app.before_request(_before_request)
app.teardown_request(_teardown_request)
app._is_instrumented = True
else:
_logger.warning(
"Attempting to instrument Flask app while already instrumented"
)
def _uninstrument(self, **kwargs):
flask.Flask = self._original_flask
def uninstrument_app(self, app): # pylint: disable=no-self-use
if not hasattr(app, "_is_instrumented"):
app._is_instrumented = False
if app._is_instrumented:
app.wsgi_app = app._original_wsgi_app
# FIXME add support for other Flask blueprints that are not None
app.before_request_funcs[None].remove(_before_request)
app.teardown_request_funcs[None].remove(_teardown_request)
del app._original_wsgi_app
app._is_instrumented = False
else:
_logger.warning(
"Attempting to uninstrument Flask "
"app while already uninstrumented"
)

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# Copyright The OpenTelemetry Authors
#
# Licensed 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.
__version__ = "0.12.dev0"

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# Copyright The OpenTelemetry Authors
#
# Licensed 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 werkzeug.test import Client
from werkzeug.wrappers import BaseResponse
from opentelemetry.configuration import Configuration
class InstrumentationTest:
def setUp(self): # pylint: disable=invalid-name
super().setUp() # pylint: disable=no-member
Configuration._reset() # pylint: disable=protected-access
@staticmethod
def _hello_endpoint(helloid):
if helloid == 500:
raise ValueError(":-(")
return "Hello: " + str(helloid)
def _common_initialization(self):
def excluded_endpoint():
return "excluded"
def excluded2_endpoint():
return "excluded2"
# pylint: disable=no-member
self.app.route("/hello/<int:helloid>")(self._hello_endpoint)
self.app.route("/excluded/<int:helloid>")(self._hello_endpoint)
self.app.route("/excluded")(excluded_endpoint)
self.app.route("/excluded2")(excluded2_endpoint)
# pylint: disable=attribute-defined-outside-init
self.client = Client(self.app, BaseResponse)

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# Copyright The OpenTelemetry Authors
#
# Licensed 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.
import flask
from werkzeug.test import Client
from werkzeug.wrappers import BaseResponse
from opentelemetry.instrumentation.flask import FlaskInstrumentor
from opentelemetry.test.test_base import TestBase
from opentelemetry.test.wsgitestutil import WsgiTestBase
# pylint: disable=import-error
from .base_test import InstrumentationTest
class TestAutomatic(InstrumentationTest, TestBase, WsgiTestBase):
def setUp(self):
super().setUp()
FlaskInstrumentor().instrument()
self.app = flask.Flask(__name__)
self._common_initialization()
def tearDown(self):
super().tearDown()
with self.disable_logging():
FlaskInstrumentor().uninstrument()
def test_uninstrument(self):
# pylint: disable=access-member-before-definition
resp = self.client.get("/hello/123")
self.assertEqual(200, resp.status_code)
self.assertEqual([b"Hello: 123"], list(resp.response))
span_list = self.memory_exporter.get_finished_spans()
self.assertEqual(len(span_list), 1)
FlaskInstrumentor().uninstrument()
self.app = flask.Flask(__name__)
self.app.route("/hello/<int:helloid>")(self._hello_endpoint)
# pylint: disable=attribute-defined-outside-init
self.client = Client(self.app, BaseResponse)
resp = self.client.get("/hello/123")
self.assertEqual(200, resp.status_code)
self.assertEqual([b"Hello: 123"], list(resp.response))
span_list = self.memory_exporter.get_finished_spans()
self.assertEqual(len(span_list), 1)

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# Copyright The OpenTelemetry Authors
#
# Licensed 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 unittest.mock import patch
from flask import Flask, request
from opentelemetry import trace
from opentelemetry.instrumentation.flask import FlaskInstrumentor
from opentelemetry.test.test_base import TestBase
from opentelemetry.test.wsgitestutil import WsgiTestBase
from opentelemetry.util import ExcludeList
# pylint: disable=import-error
from .base_test import InstrumentationTest
def expected_attributes(override_attributes):
default_attributes = {
"component": "http",
"http.method": "GET",
"http.server_name": "localhost",
"http.scheme": "http",
"host.port": 80,
"http.host": "localhost",
"http.target": "/",
"http.flavor": "1.1",
"http.status_text": "OK",
"http.status_code": 200,
}
for key, val in override_attributes.items():
default_attributes[key] = val
return default_attributes
class TestProgrammatic(InstrumentationTest, TestBase, WsgiTestBase):
def setUp(self):
super().setUp()
self.app = Flask(__name__)
FlaskInstrumentor().instrument_app(self.app)
self._common_initialization()
def tearDown(self):
super().tearDown()
with self.disable_logging():
FlaskInstrumentor().uninstrument_app(self.app)
def test_uninstrument(self):
resp = self.client.get("/hello/123")
self.assertEqual(200, resp.status_code)
self.assertEqual([b"Hello: 123"], list(resp.response))
span_list = self.memory_exporter.get_finished_spans()
self.assertEqual(len(span_list), 1)
FlaskInstrumentor().uninstrument_app(self.app)
resp = self.client.get("/hello/123")
self.assertEqual(200, resp.status_code)
self.assertEqual([b"Hello: 123"], list(resp.response))
span_list = self.memory_exporter.get_finished_spans()
self.assertEqual(len(span_list), 1)
# pylint: disable=no-member
def test_only_strings_in_environ(self):
"""
Some WSGI servers (such as Gunicorn) expect keys in the environ object
to be strings
OpenTelemetry should adhere to this convention.
"""
nonstring_keys = set()
def assert_environ():
for key in request.environ:
if not isinstance(key, str):
nonstring_keys.add(key)
return "hi"
self.app.route("/assert_environ")(assert_environ)
self.client.get("/assert_environ")
self.assertEqual(nonstring_keys, set())
def test_simple(self):
expected_attrs = expected_attributes(
{"http.target": "/hello/123", "http.route": "/hello/<int:helloid>"}
)
self.client.get("/hello/123")
span_list = self.memory_exporter.get_finished_spans()
self.assertEqual(len(span_list), 1)
self.assertEqual(span_list[0].name, "_hello_endpoint")
self.assertEqual(span_list[0].kind, trace.SpanKind.SERVER)
self.assertEqual(span_list[0].attributes, expected_attrs)
def test_404(self):
expected_attrs = expected_attributes(
{
"http.method": "POST",
"http.target": "/bye",
"http.status_text": "NOT FOUND",
"http.status_code": 404,
}
)
resp = self.client.post("/bye")
self.assertEqual(404, resp.status_code)
resp.close()
span_list = self.memory_exporter.get_finished_spans()
self.assertEqual(len(span_list), 1)
self.assertEqual(span_list[0].name, "HTTP POST")
self.assertEqual(span_list[0].kind, trace.SpanKind.SERVER)
self.assertEqual(span_list[0].attributes, expected_attrs)
def test_internal_error(self):
expected_attrs = expected_attributes(
{
"http.target": "/hello/500",
"http.route": "/hello/<int:helloid>",
"http.status_text": "INTERNAL SERVER ERROR",
"http.status_code": 500,
}
)
resp = self.client.get("/hello/500")
self.assertEqual(500, resp.status_code)
resp.close()
span_list = self.memory_exporter.get_finished_spans()
self.assertEqual(len(span_list), 1)
self.assertEqual(span_list[0].name, "_hello_endpoint")
self.assertEqual(span_list[0].kind, trace.SpanKind.SERVER)
self.assertEqual(span_list[0].attributes, expected_attrs)
@patch(
"opentelemetry.instrumentation.flask._excluded_urls",
ExcludeList(["http://localhost/excluded_arg/123", "excluded_noarg"]),
)
def test_exclude_lists(self):
self.client.get("/excluded_arg/123")
span_list = self.memory_exporter.get_finished_spans()
self.assertEqual(len(span_list), 0)
self.client.get("/excluded_arg/125")
span_list = self.memory_exporter.get_finished_spans()
self.assertEqual(len(span_list), 1)
self.client.get("/excluded_noarg")
span_list = self.memory_exporter.get_finished_spans()
self.assertEqual(len(span_list), 1)
self.client.get("/excluded_noarg2")
span_list = self.memory_exporter.get_finished_spans()
self.assertEqual(len(span_list), 1)