78 lines
3.1 KiB
Python
78 lines
3.1 KiB
Python
# (C) Copyright 2015 Hewlett Packard Enterprise Development Company LP
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import re
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import urllib2
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from monasca_agent.collector.checks import AgentCheck
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from monasca_agent.collector.checks.utils import add_basic_auth
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from monasca_agent.common.util import headers
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class Nginx(AgentCheck):
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"""Tracks basic nginx metrics via the status module
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* number of connections
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* number of requets per second
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Requires nginx to have the status option compiled.
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See http://wiki.nginx.org/HttpStubStatusModule for more details
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$ curl http://localhost:81/nginx_status/
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Active connections: 8
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server accepts handled requests
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1156958 1156958 4491319
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Reading: 0 Writing: 2 Waiting: 6
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"""
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def check(self, instance):
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if 'nginx_status_url' not in instance:
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raise Exception('NginX instance missing "nginx_status_url" value.')
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dimensions = self._set_dimensions(None, instance)
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response = self._get_data(instance)
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self._get_metrics(response, dimensions)
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def _get_data(self, instance):
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url = instance.get('nginx_status_url')
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req = urllib2.Request(url, None, headers(self.agent_config))
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if 'user' in instance and 'password' in instance:
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add_basic_auth(req, instance['user'], instance['password'])
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request = urllib2.urlopen(req)
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return request.read()
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def _get_metrics(self, response, dimensions):
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# Thanks to http://hostingfu.com/files/nginx/nginxstats.py for this code
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# Connections
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parsed = re.search(r'Active connections:\s+(\d+)', response)
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if parsed:
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connections = int(parsed.group(1))
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self.gauge("nginx.net.connections", connections, dimensions=dimensions)
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# Requests per second
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parsed = re.search(r'\s*(\d+)\s+(\d+)\s+(\d+)', response)
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if parsed:
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conn = int(parsed.group(1))
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requests = int(parsed.group(3))
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self.rate("nginx.net.conn_opened_per_s", conn, dimensions=dimensions)
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self.rate("nginx.net.request_per_s", requests, dimensions=dimensions)
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# Connection states, reading, writing or waiting for clients
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parsed = re.search(r'Reading: (\d+)\s+Writing: (\d+)\s+Waiting: (\d+)', response)
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if parsed:
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reading, writing, waiting = map(int, parsed.groups())
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self.gauge("nginx.net.reading", reading, dimensions=dimensions)
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self.gauge("nginx.net.writing", writing, dimensions=dimensions)
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self.gauge("nginx.net.waiting", waiting, dimensions=dimensions)
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