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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# import psutil
import urllib2
import time
import plugins
class Plugin(plugins.BasePlugin):
__name__ = 'nginx'
def run(self, config):
'''
Provides the following metrics (example):
"accepts": 588462,
"accepts_per_second": 0.0,
"active_connections": 192,
"handled": 588462,
"handled_per_second": 0.0,
"reading": 0,
"requests": 9637106,
"requests_per_second": 0.0,
"waiting": 189,
"writing": 3
requests, accepts, handled are values since the start of nginx.
*_per_second values calculated from them using cached values from previous call.
'''
try:
results = dict()
next_cache = dict()
request = urllib2.Request(config.get('nginx', 'status_page_url'))
raw_response = urllib2.urlopen(request)
next_cache['ts'] = time.time()
prev_cache = self.get_agent_cache() # Get absolute values from previous check
response = raw_response.readlines()
# Active connections: N
# active_connections = response[0].split(':')[1].strip()
active_connections = response[0].split()[-1]
results['active_connections'] = int(active_connections)
# server accepts handled requests
keys = response[1].split()[1:]
values = response[2].split()
for key, value in zip(keys, values):
next_cache[key] = int(value)
results[key] = next_cache[key] # Keep absolute values in results
try:
if next_cache[key] >= prev_cache[key]:
results['%s_per_second' % key] = \
(next_cache[key] - prev_cache[key]) / \
(next_cache['ts'] - prev_cache['ts'])
else: # Nginx was restarted after previous caching
results['%s_per_second' % key] = \
next_cache[key] / \
(next_cache['ts'] - prev_cache['ts'])
except KeyError: # No cache yet, can't calculate
results['%s_per_second' % key] = 0.0
# Reading: X Writing: Y Waiting: Z
keys = response[3].split()[0::2]
keys = [entry.strip(':').lower() for entry in keys]
values = response[3].split()[1::2]
for key, value in zip(keys, values):
results[key] = int(value)
# Cache absolute values for next check calculations
self.set_agent_cache(next_cache)
return results
except Exception:
return False
if __name__ == '__main__':
Plugin().execute()
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