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Merge pull request #75 from NathanielRN/move-instrumentation-wsgi

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Move instrumentation wsgi
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alrex
2020-10-22 22:03:37 -07:00
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parent 018065f195 a7634815b5
commit b10c265500
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# Changelog
## Unreleased
## Version 0.13b0
Released 2020-09-17
- Drop support for Python 3.4
([#1099](https://github.com/open-telemetry/opentelemetry-python/pull/1099))
## Version 0.12b0
Released 2020-08-14
- Change package name to opentelemetry-instrumentation-wsgi
([#961](https://github.com/open-telemetry/opentelemetry-python/pull/961))
## Version 0.11b0
Released 2020-07-28
- Set span status on wsgi errors
([#864](https://github.com/open-telemetry/opentelemetry-python/pull/864))
## 0.4a0
Released 2020-02-21
- Updating network connection attribute names
([#350](https://github.com/open-telemetry/opentelemetry-python/pull/350))
## 0.3a0
Released 2019-12-11
- Support new semantic conventions
([#299](https://github.com/open-telemetry/opentelemetry-python/pull/299))
- Updates for core library changes
## 0.2a0
Released 2019-10-29
- Updates for core library changes
## 0.1a0
Released 2019-09-30
- 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 WSGI Middleware
=============================
|pypi|
.. |pypi| image:: https://badge.fury.io/py/opentelemetry-instrumentation-wsgi.svg
:target: https://pypi.org/project/opentelemetry-instrumentation-wsgi/
This library provides a WSGI middleware that can be used on any WSGI framework
(such as Django / Flask) to track requests timing through OpenTelemetry.
Installation
------------
::
pip install opentelemetry-instrumentation-wsgi
References
----------
* `OpenTelemetry WSGI Middleware <https://opentelemetry-python.readthedocs.io/en/latest/instrumentation/wsgi/wsgi.html>`_
* `OpenTelemetry Project <https://opentelemetry.io/>`_
* `WSGI <https://www.python.org/dev/peps/pep-3333>`_

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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-wsgi
description = WSGI Middleware 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-wsgi
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 :: 3.5
Programming Language :: Python :: 3.6
Programming Language :: Python :: 3.7
Programming Language :: Python :: 3.8
[options]
python_requires = >=3.5
package_dir=
=src
packages=find_namespace:
install_requires =
opentelemetry-api == 0.15.dev0
opentelemetry-instrumentation == 0.15.dev0
[options.extras_require]
test =
opentelemetry-test == 0.15.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", "wsgi", "version.py"
)
PACKAGE_INFO = {}
with open(VERSION_FILENAME) as f:
exec(f.read(), PACKAGE_INFO)
setuptools.setup(version=PACKAGE_INFO["__version__"])

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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.
"""
This library provides a WSGI middleware that can be used on any WSGI framework
(such as Django / Flask) to track requests timing through OpenTelemetry.
Usage (Flask)
-------------
.. code-block:: python
from flask import Flask
from opentelemetry.instrumentation.wsgi import OpenTelemetryMiddleware
app = Flask(__name__)
app.wsgi_app = OpenTelemetryMiddleware(app.wsgi_app)
@app.route("/")
def hello():
return "Hello!"
if __name__ == "__main__":
app.run(debug=True)
Usage (Django)
--------------
Modify the application's ``wsgi.py`` file as shown below.
.. code-block:: python
import os
from opentelemetry.instrumentation.wsgi import OpenTelemetryMiddleware
from django.core.wsgi import get_wsgi_application
os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'application.settings')
application = get_wsgi_application()
application = OpenTelemetryMiddleware(application)
API
---
"""
import functools
import typing
import wsgiref.util as wsgiref_util
from opentelemetry import context, propagators, trace
from opentelemetry.instrumentation.utils import http_status_to_canonical_code
from opentelemetry.instrumentation.wsgi.version import __version__
from opentelemetry.trace.status import Status, StatusCanonicalCode
_HTTP_VERSION_PREFIX = "HTTP/"
def get_header_from_environ(
environ: dict, header_name: str
) -> typing.List[str]:
"""Retrieve a HTTP header value from the PEP3333-conforming WSGI environ.
Returns:
A list with a single string with the header value if it exists, else an empty list.
"""
environ_key = "HTTP_" + header_name.upper().replace("-", "_")
value = environ.get(environ_key)
if value is not None:
return [value]
return []
def setifnotnone(dic, key, value):
if value is not None:
dic[key] = value
def collect_request_attributes(environ):
"""Collects HTTP request attributes from the PEP3333-conforming
WSGI environ and returns a dictionary to be used as span creation attributes."""
result = {
"component": "http",
"http.method": environ.get("REQUEST_METHOD"),
"http.server_name": environ.get("SERVER_NAME"),
"http.scheme": environ.get("wsgi.url_scheme"),
}
host_port = environ.get("SERVER_PORT")
if host_port is not None:
result.update({"host.port": int(host_port)})
setifnotnone(result, "http.host", environ.get("HTTP_HOST"))
target = environ.get("RAW_URI")
if target is None: # Note: `"" or None is None`
target = environ.get("REQUEST_URI")
if target is not None:
result["http.target"] = target
else:
result["http.url"] = wsgiref_util.request_uri(environ)
remote_addr = environ.get("REMOTE_ADDR")
if remote_addr:
result["net.peer.ip"] = remote_addr
remote_host = environ.get("REMOTE_HOST")
if remote_host and remote_host != remote_addr:
result["net.peer.name"] = remote_host
user_agent = environ.get("HTTP_USER_AGENT")
if user_agent is not None and len(user_agent) > 0:
result["http.user_agent"] = user_agent
setifnotnone(result, "net.peer.port", environ.get("REMOTE_PORT"))
flavor = environ.get("SERVER_PROTOCOL", "")
if flavor.upper().startswith(_HTTP_VERSION_PREFIX):
flavor = flavor[len(_HTTP_VERSION_PREFIX) :]
if flavor:
result["http.flavor"] = flavor
return result
def add_response_attributes(
span, start_response_status, response_headers
): # pylint: disable=unused-argument
"""Adds HTTP response attributes to span using the arguments
passed to a PEP3333-conforming start_response callable."""
if not span.is_recording():
return
status_code, status_text = start_response_status.split(" ", 1)
span.set_attribute("http.status_text", status_text)
try:
status_code = int(status_code)
except ValueError:
span.set_status(
Status(
StatusCanonicalCode.UNKNOWN,
"Non-integer HTTP status: " + repr(status_code),
)
)
else:
span.set_attribute("http.status_code", status_code)
span.set_status(Status(http_status_to_canonical_code(status_code)))
def get_default_span_name(environ):
"""Default implementation for name_callback, returns HTTP {METHOD_NAME}."""
return "HTTP {}".format(environ.get("REQUEST_METHOD", "")).strip()
class OpenTelemetryMiddleware:
"""The WSGI application middleware.
This class is a PEP 3333 conforming WSGI middleware that starts and
annotates spans for any requests it is invoked with.
Args:
wsgi: The WSGI application callable to forward requests to.
name_callback: Callback which calculates a generic span name for an
incoming HTTP request based on the PEP3333 WSGI environ.
Optional: Defaults to get_default_span_name.
"""
def __init__(self, wsgi, name_callback=get_default_span_name):
self.wsgi = wsgi
self.tracer = trace.get_tracer(__name__, __version__)
self.name_callback = name_callback
@staticmethod
def _create_start_response(span, start_response):
@functools.wraps(start_response)
def _start_response(status, response_headers, *args, **kwargs):
add_response_attributes(span, status, response_headers)
return start_response(status, response_headers, *args, **kwargs)
return _start_response
def __call__(self, environ, start_response):
"""The WSGI application
Args:
environ: A WSGI environment.
start_response: The WSGI start_response callable.
"""
token = context.attach(
propagators.extract(get_header_from_environ, environ)
)
span_name = self.name_callback(environ)
span = self.tracer.start_span(
span_name,
kind=trace.SpanKind.SERVER,
attributes=collect_request_attributes(environ),
)
try:
with self.tracer.use_span(span):
start_response = self._create_start_response(
span, start_response
)
iterable = self.wsgi(environ, start_response)
return _end_span_after_iterating(
iterable, span, self.tracer, token
)
except Exception as ex:
if span.is_recording():
span.set_status(Status(StatusCanonicalCode.INTERNAL, str(ex)))
span.end()
context.detach(token)
raise
# Put this in a subfunction to not delay the call to the wrapped
# WSGI application (instrumentation should change the application
# behavior as little as possible).
def _end_span_after_iterating(iterable, span, tracer, token):
try:
with tracer.use_span(span):
for yielded in iterable:
yield yielded
finally:
close = getattr(iterable, "close", None)
if close:
close()
span.end()
context.detach(token)

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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__ = "0.15.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.
import sys
import unittest
import unittest.mock as mock
import wsgiref.util as wsgiref_util
from urllib.parse import urlsplit
import opentelemetry.instrumentation.wsgi as otel_wsgi
from opentelemetry import trace as trace_api
from opentelemetry.test.wsgitestutil import WsgiTestBase
from opentelemetry.trace.status import StatusCanonicalCode
class Response:
def __init__(self):
self.iter = iter([b"*"])
self.close_calls = 0
def __iter__(self):
return self
def __next__(self):
return next(self.iter)
def close(self):
self.close_calls += 1
def simple_wsgi(environ, start_response):
assert isinstance(environ, dict)
start_response("200 OK", [("Content-Type", "text/plain")])
return [b"*"]
def create_iter_wsgi(response):
def iter_wsgi(environ, start_response):
assert isinstance(environ, dict)
start_response("200 OK", [("Content-Type", "text/plain")])
return response
return iter_wsgi
def create_gen_wsgi(response):
def gen_wsgi(environ, start_response):
result = create_iter_wsgi(response)(environ, start_response)
yield from result
getattr(result, "close", lambda: None)()
return gen_wsgi
def error_wsgi(environ, start_response):
assert isinstance(environ, dict)
try:
raise ValueError
except ValueError:
exc_info = sys.exc_info()
start_response("200 OK", [("Content-Type", "text/plain")], exc_info)
exc_info = None
return [b"*"]
def error_wsgi_unhandled(environ, start_response):
assert isinstance(environ, dict)
raise ValueError
class TestWsgiApplication(WsgiTestBase):
def validate_response(
self, response, error=None, span_name="HTTP GET", http_method="GET"
):
while True:
try:
value = next(response)
self.assertEqual(value, b"*")
except StopIteration:
break
self.assertEqual(self.status, "200 OK")
self.assertEqual(
self.response_headers, [("Content-Type", "text/plain")]
)
if error:
self.assertIs(self.exc_info[0], error)
self.assertIsInstance(self.exc_info[1], error)
self.assertIsNotNone(self.exc_info[2])
else:
self.assertIsNone(self.exc_info)
span_list = self.memory_exporter.get_finished_spans()
self.assertEqual(len(span_list), 1)
self.assertEqual(span_list[0].name, span_name)
self.assertEqual(span_list[0].kind, trace_api.SpanKind.SERVER)
expected_attributes = {
"component": "http",
"http.server_name": "127.0.0.1",
"http.scheme": "http",
"host.port": 80,
"http.host": "127.0.0.1",
"http.flavor": "1.0",
"http.url": "http://127.0.0.1/",
"http.status_text": "OK",
"http.status_code": 200,
}
if http_method is not None:
expected_attributes["http.method"] = http_method
self.assertEqual(span_list[0].attributes, expected_attributes)
def test_basic_wsgi_call(self):
app = otel_wsgi.OpenTelemetryMiddleware(simple_wsgi)
response = app(self.environ, self.start_response)
self.validate_response(response)
def test_wsgi_not_recording(self):
mock_tracer = mock.Mock()
mock_span = mock.Mock()
mock_span.is_recording.return_value = False
mock_tracer.start_span.return_value = mock_span
mock_tracer.use_span.return_value.__enter__ = mock_span
mock_tracer.use_span.return_value.__exit__ = mock_span
with mock.patch("opentelemetry.trace.get_tracer") as tracer:
tracer.return_value = mock_tracer
app = otel_wsgi.OpenTelemetryMiddleware(simple_wsgi)
# pylint: disable=W0612
response = app(self.environ, self.start_response) # noqa: F841
self.assertFalse(mock_span.is_recording())
self.assertTrue(mock_span.is_recording.called)
self.assertFalse(mock_span.set_attribute.called)
self.assertFalse(mock_span.set_status.called)
def test_wsgi_iterable(self):
original_response = Response()
iter_wsgi = create_iter_wsgi(original_response)
app = otel_wsgi.OpenTelemetryMiddleware(iter_wsgi)
response = app(self.environ, self.start_response)
# Verify that start_response has been called
self.assertTrue(self.status)
self.validate_response(response)
# Verify that close has been called exactly once
self.assertEqual(1, original_response.close_calls)
def test_wsgi_generator(self):
original_response = Response()
gen_wsgi = create_gen_wsgi(original_response)
app = otel_wsgi.OpenTelemetryMiddleware(gen_wsgi)
response = app(self.environ, self.start_response)
# Verify that start_response has not been called
self.assertIsNone(self.status)
self.validate_response(response)
# Verify that close has been called exactly once
self.assertEqual(original_response.close_calls, 1)
def test_wsgi_exc_info(self):
app = otel_wsgi.OpenTelemetryMiddleware(error_wsgi)
response = app(self.environ, self.start_response)
self.validate_response(response, error=ValueError)
def test_wsgi_internal_error(self):
app = otel_wsgi.OpenTelemetryMiddleware(error_wsgi_unhandled)
self.assertRaises(ValueError, app, self.environ, self.start_response)
span_list = self.memory_exporter.get_finished_spans()
self.assertEqual(len(span_list), 1)
self.assertEqual(
span_list[0].status.canonical_code, StatusCanonicalCode.INTERNAL,
)
def test_override_span_name(self):
"""Test that span_names can be overwritten by our callback function."""
span_name = "Dymaxion"
def get_predefined_span_name(scope):
# pylint: disable=unused-argument
return span_name
app = otel_wsgi.OpenTelemetryMiddleware(
simple_wsgi, name_callback=get_predefined_span_name
)
response = app(self.environ, self.start_response)
self.validate_response(response, span_name=span_name)
def test_default_span_name_missing_request_method(self):
"""Test that default span_names with missing request method."""
self.environ.pop("REQUEST_METHOD")
app = otel_wsgi.OpenTelemetryMiddleware(simple_wsgi)
response = app(self.environ, self.start_response)
self.validate_response(response, span_name="HTTP", http_method=None)
class TestWsgiAttributes(unittest.TestCase):
def setUp(self):
self.environ = {}
wsgiref_util.setup_testing_defaults(self.environ)
self.span = mock.create_autospec(trace_api.Span, spec_set=True)
def test_request_attributes(self):
self.environ["QUERY_STRING"] = "foo=bar"
attrs = otel_wsgi.collect_request_attributes(self.environ)
self.assertDictEqual(
attrs,
{
"component": "http",
"http.method": "GET",
"http.host": "127.0.0.1",
"http.url": "http://127.0.0.1/?foo=bar",
"host.port": 80,
"http.scheme": "http",
"http.server_name": "127.0.0.1",
"http.flavor": "1.0",
},
)
def validate_url(self, expected_url, raw=False, has_host=True):
parts = urlsplit(expected_url)
expected = {
"http.scheme": parts.scheme,
"host.port": parts.port or (80 if parts.scheme == "http" else 443),
"http.server_name": parts.hostname, # Not true in the general case, but for all tests.
}
if raw:
expected["http.target"] = expected_url.split(parts.netloc, 1)[1]
else:
expected["http.url"] = expected_url
if has_host:
expected["http.host"] = parts.hostname
attrs = otel_wsgi.collect_request_attributes(self.environ)
self.assertGreaterEqual(
attrs.items(), expected.items(), expected_url + " expected."
)
def test_request_attributes_with_partial_raw_uri(self):
self.environ["RAW_URI"] = "/#top"
self.validate_url("http://127.0.0.1/#top", raw=True)
def test_request_attributes_with_partial_raw_uri_and_nonstandard_port(
self,
):
self.environ["RAW_URI"] = "/?"
del self.environ["HTTP_HOST"]
self.environ["SERVER_PORT"] = "8080"
self.validate_url("http://127.0.0.1:8080/?", raw=True, has_host=False)
def test_https_uri_port(self):
del self.environ["HTTP_HOST"]
self.environ["SERVER_PORT"] = "443"
self.environ["wsgi.url_scheme"] = "https"
self.validate_url("https://127.0.0.1/", has_host=False)
self.environ["SERVER_PORT"] = "8080"
self.validate_url("https://127.0.0.1:8080/", has_host=False)
self.environ["SERVER_PORT"] = "80"
self.validate_url("https://127.0.0.1:80/", has_host=False)
def test_http_uri_port(self):
del self.environ["HTTP_HOST"]
self.environ["SERVER_PORT"] = "80"
self.environ["wsgi.url_scheme"] = "http"
self.validate_url("http://127.0.0.1/", has_host=False)
self.environ["SERVER_PORT"] = "8080"
self.validate_url("http://127.0.0.1:8080/", has_host=False)
self.environ["SERVER_PORT"] = "443"
self.validate_url("http://127.0.0.1:443/", has_host=False)
def test_request_attributes_with_nonstandard_port_and_no_host(self):
del self.environ["HTTP_HOST"]
self.environ["SERVER_PORT"] = "8080"
self.validate_url("http://127.0.0.1:8080/", has_host=False)
self.environ["SERVER_PORT"] = "443"
self.validate_url("http://127.0.0.1:443/", has_host=False)
def test_request_attributes_with_conflicting_nonstandard_port(self):
self.environ[
"HTTP_HOST"
] += ":8080" # Note that we do not correct SERVER_PORT
expected = {
"http.host": "127.0.0.1:8080",
"http.url": "http://127.0.0.1:8080/",
"host.port": 80,
}
self.assertGreaterEqual(
otel_wsgi.collect_request_attributes(self.environ).items(),
expected.items(),
)
def test_request_attributes_with_faux_scheme_relative_raw_uri(self):
self.environ["RAW_URI"] = "//127.0.0.1/?"
self.validate_url("http://127.0.0.1//127.0.0.1/?", raw=True)
def test_request_attributes_pathless(self):
self.environ["RAW_URI"] = ""
expected = {"http.target": ""}
self.assertGreaterEqual(
otel_wsgi.collect_request_attributes(self.environ).items(),
expected.items(),
)
def test_request_attributes_with_full_request_uri(self):
self.environ["HTTP_HOST"] = "127.0.0.1:8080"
self.environ["REQUEST_METHOD"] = "CONNECT"
self.environ[
"REQUEST_URI"
] = "127.0.0.1:8080" # Might happen in a CONNECT request
expected = {
"http.host": "127.0.0.1:8080",
"http.target": "127.0.0.1:8080",
}
self.assertGreaterEqual(
otel_wsgi.collect_request_attributes(self.environ).items(),
expected.items(),
)
def test_http_user_agent_attribute(self):
self.environ["HTTP_USER_AGENT"] = "test-useragent"
expected = {"http.user_agent": "test-useragent"}
self.assertGreaterEqual(
otel_wsgi.collect_request_attributes(self.environ).items(),
expected.items(),
)
def test_response_attributes(self):
otel_wsgi.add_response_attributes(self.span, "404 Not Found", {})
expected = (
mock.call("http.status_code", 404),
mock.call("http.status_text", "Not Found"),
)
self.assertEqual(self.span.set_attribute.call_count, len(expected))
self.span.set_attribute.assert_has_calls(expected, any_order=True)
def test_response_attributes_invalid_status_code(self):
otel_wsgi.add_response_attributes(self.span, "Invalid Status Code", {})
self.assertEqual(self.span.set_attribute.call_count, 1)
self.span.set_attribute.assert_called_with(
"http.status_text", "Status Code"
)
if __name__ == "__main__":
unittest.main()