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# -*- coding: utf-8 -*-
#
# This file is part of Glances.
#
# SPDX-FileCopyrightText: 2022 Nicolas Hennion <nicolas@nicolargo.com>
#
# SPDX-License-Identifier: LGPL-3.0-only
#
r"""
Nginx AMP
=========
Monitor the Nginx process using the status page.
How to read the stats
---------------------
Active connections – Number of all open connections. This doesn't mean number of users.
A single user, for a single page-view can open many concurrent connections to your server.
Server accepts handled requests – This shows three values.
First is total accepted connections.
Second is total handled connections. Usually first 2 values are same.
Third value is number of and handles requests. This is usually greater than second value.
Dividing third-value by second-one will give you number of requests per connection handled
by Nginx. In above example, 10993/7368, 1.49 requests per connections.
Reading – nginx reads request header
Writing – nginx reads request body, processes request, or writes response to a client
Waiting – keep-alive connections, actually it is active – (reading + writing).
This value depends on keepalive-timeout. Do not confuse non-zero waiting value for poor
performance. It can be ignored.
Source reference: https://easyengine.io/tutorials/nginx/status-page/
Configuration file example
--------------------------
[amp_nginx]
# Nginx status page should be enable (https://easyengine.io/tutorials/nginx/status-page/)
enable=true
regex=\/usr\/sbin\/nginx
refresh=60
one_line=false
status_url=http://localhost/nginx_status
"""
import requests
from glances.logger import logger
from glances.amps.glances_amp import GlancesAmp
class Amp(GlancesAmp):
"""Glances' Nginx AMP."""
NAME = 'Nginx'
VERSION = '1.0'
DESCRIPTION = 'Get Nginx stats from status-page'
AUTHOR = 'Nicolargo'
EMAIL = 'contact@nicolargo.com'
# def __init__(self, args=None):
# """Init the AMP."""
# super(Amp, self).__init__(args=args)
def update(self, process_list):
"""Update the AMP"""
# Get the Nginx status
logger.debug('{}: Update stats using status URL {}'.format(self.NAME, self.get('status_url')))
res = requests.get(self.get('status_url'))
if res.ok:
# u'Active connections: 1 \nserver accepts handled requests\n 1 1 1 \nReading: 0 Writing: 1 Waiting: 0 \n'
self.set_result(res.text.rstrip())
else:
logger.debug('{}: Can not grab status URL {} ({})'.format(self.NAME, self.get('status_url'), res.reason))
return self.result()