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* Bump versions * Apply Requests library spec fidelity * Fixes value for `http.route` in Flask middleware * Standard Metrics - Incoming Requests Per Second (#758) * Incoming requests for Python3 * python2 support * change namespace * add tests * More tests * Fix lint * Fix lint * Add test * Add CHANGELOG * Hotfix/django flask pyramid status code * Fixed requests contrib to raise original exceptions
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109 changes: 109 additions & 0 deletions
109
...ncensus-ext-azure/opencensus/ext/azure/metrics_exporter/standard_metrics/http_requests.py
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,109 @@ | ||
| # Copyright 2019, OpenCensus 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 time | ||
|
|
||
| from opencensus.metrics.export.gauge import DerivedDoubleGauge | ||
| if sys.version_info < (3,): | ||
| from BaseHTTPServer import HTTPServer | ||
| else: | ||
| from http.server import HTTPServer | ||
|
|
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| requests_map = dict() | ||
| ORIGINAL_CONSTRUCTOR = HTTPServer.__init__ | ||
|
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|
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| def request_patch(func): | ||
| def wrapper(self=None): | ||
| func(self) | ||
| count = requests_map.get('count', 0) | ||
| requests_map['count'] = count + 1 | ||
| return wrapper | ||
|
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||
|
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| def server_patch(*args, **kwargs): | ||
| if len(args) >= 3: | ||
| handler = args[2] | ||
| if handler: | ||
| # Patch the handler methods if they exist | ||
| if "do_DELETE" in dir(handler): | ||
| handler.do_DELETE = request_patch(handler.do_DELETE) | ||
| if "do_GET" in dir(handler): | ||
| handler.do_GET = request_patch(handler.do_GET) | ||
| if "do_HEAD" in dir(handler): | ||
| handler.do_HEAD = request_patch(handler.do_HEAD) | ||
| if "do_OPTIONS" in dir(handler): | ||
| handler.do_OPTIONS = request_patch(handler.do_OPTIONS) | ||
| if "do_POST" in dir(handler): | ||
| handler.do_POST = request_patch(handler.do_POST) | ||
| if "do_PUT" in dir(handler): | ||
| handler.do_PUT = request_patch(handler.do_PUT) | ||
| result = ORIGINAL_CONSTRUCTOR(*args, **kwargs) | ||
| return result | ||
|
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|
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| def setup(): | ||
| # Patch the HTTPServer handler to track request information | ||
| HTTPServer.__init__ = server_patch | ||
|
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|
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| class RequestsRateMetric(object): | ||
| NAME = "\\ASP.NET Applications(??APP_W3SVC_PROC??)\\Requests/Sec" | ||
|
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| def __init__(self): | ||
| setup() | ||
|
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| @staticmethod | ||
| def get_value(): | ||
| current_count = requests_map.get('count', 0) | ||
| current_time = time.time() | ||
| last_count = requests_map.get('last_count', 0) | ||
| last_time = requests_map.get('last_time') | ||
| last_result = requests_map.get('last_result', 0) | ||
|
|
||
| try: | ||
| # last_time is None the very first time this function is called | ||
| if last_time is not None: | ||
| elapsed_seconds = current_time - last_time | ||
| interval_count = current_count - last_count | ||
| result = interval_count / elapsed_seconds | ||
| else: | ||
| result = 0 | ||
| requests_map['last_time'] = current_time | ||
| requests_map['last_count'] = current_count | ||
| requests_map['last_result'] = result | ||
| return result | ||
| except ZeroDivisionError: | ||
| # If elapsed_seconds is 0, exporter call made too close to previous | ||
| # Return the previous result if this is the case | ||
| return last_result | ||
|
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| def __call__(self): | ||
| """ Returns a derived gauge for incoming requests per second | ||
| Calculated by obtaining by getting the number of incoming requests | ||
| made to an HTTPServer within an elapsed time and dividing that value | ||
| over the elapsed time. | ||
| :rtype: :class:`opencensus.metrics.export.gauge.DerivedLongGauge` | ||
| :return: The gauge representing the incoming requests metric | ||
| """ | ||
| gauge = DerivedDoubleGauge( | ||
| RequestsRateMetric.NAME, | ||
| 'Incoming Requests per second', | ||
| 'rps', | ||
| []) | ||
| gauge.create_default_time_series(RequestsRateMetric.get_value) | ||
| return gauge |
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