check_graphite

#!/usr/bin/python

# Copyright (c) 2011 Recoset <nicolas@recoset.com>
# 
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# THE SOFTWARE.

from NagAconda import Plugin
import urllib2

def f_avg(values):
  return sum(values)/len(values);

def f_last(values):
  return values[-1]

def f_min(values):
  return min(values)

def f_max(values):
  return max(values)

functionmap = {
  "avg":{  "label": "average", "function": f_avg },
  "last":{ "label": "last",    "function": f_last },
  "min":{  "label": "minimum", "function": f_min },
  "max":{  "label": "maximum", "function": f_max },
}

graphite = Plugin("Plugin to retrieve data from graphite", "1.0")
graphite.add_option("u", "url", "URL to query for data", required=True)
graphite.add_option("U", "username", "User for authentication")
graphite.add_option("P", "password", "Password for authentication")
graphite.add_option("H", "hostname", "Host name to use in the URL")
graphite.add_option("n", "none", "Ignore None values: 'yes' or 'no' (default no)")
graphite.add_option("f", "function", "Function to run on retrieved values: avg/min/max/last (default 'avg')",
  default="avg")

graphite.enable_status("warning")
graphite.enable_status("critical")
graphite.start()

if graphite.options.username and graphite.options.password:
  password_mgr = urllib2.HTTPPasswordMgrWithDefaultRealm()
  password_mgr.add_password(None,uri=graphite.options.url,
              user=graphite.options.username,
              passwd=graphite.options.password)
  auth_handler =urllib2.HTTPBasicAuthHandler(password_mgr)
  opener = urllib2.build_opener(auth_handler)
  urllib2.install_opener(opener)

if graphite.options.hostname:
  graphite.options.url = graphite.options.url.replace('@HOSTNAME@', 
    graphite.options.hostname.replace('.','_'))

usock = urllib2.urlopen(graphite.options.url)
data = usock.read()
usock.close()

if graphite.options.function not in functionmap:
  graphite.unknown_error("Bad function name given to -f/--function option: '%s'" % graphite.options.function)

pieces = data.split("|")
counter = pieces[0].split(",")[0]
values = pieces[1].split(",")[:-1]

if graphite.options.none == 'yes':
  values = map(lambda x: float(x), filter(lambda x: x != 'None', values))
else:
  values = map(lambda x: 0.0 if x == 'None' else float(x), values)
if len(values) == 0:
  graphite.unknown_error("Graphite returned an empty list of values")
else:
  value = functionmap[graphite.options.function]["function"](values)

graphite.set_value(counter, value)
graphite.set_status_message("%s value of %s: %f" % (functionmap[graphite.options.function]["label"], counter, value))

graphite.finish()