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#!/usr/bin/python
# vim: set fileencoding=utf-8 :
#
# Munin plugin to monitor the negative draft in the combustion chamber
# of a pellematic
#
# Copyright 2013 Guido Günther <agx@sigxcpu.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# depends: python-requests
#
#%# capabilities=autoconf
#%# family=contrib
import requests
import os
import re
import sys
import json
username = os.getenv('username', 'oekofen')
password = os.getenv('password', username)
debug = os.getenv('debug')
url = os.getenv('url')
# The items we want to plot:
items = {"CAPPL:FA[0].L_unterdruck":
"Negative Draft",
}
def fixup(name):
return name
def canon(name):
return re.sub(r"[^a-zA-Z0-9_]", "_", name)
def get_name(item):
"""
Get the name of an item we care about. Use
the shortText if available. If not use a
hardcoded name.
If we don't know that item return None.
"""
if item['name'] in items.keys():
if item['shortText'] != '???':
return fixup(item['shortText'])
else:
return items[item['name']]
else:
return None
def print_config(url):
print """graph_title Pellematic Negative Draft
graph_vlabel Draft in Pa
graph_category Heating
graph_info This graph shows the negative pressure in the combustion chamber of a Pellematic by Ökofen"""
out = fetch_raw(url)
for item in out:
name = get_name(item)
if name:
print "%s.label %s" % (canon(name), name)
print "%s.type GAUGE" % canon(name)
thickness = 1 if name.endswith(' Set') else 2
print "%s.draw LINE%d" % (canon(name), thickness)
def calc(val):
return float(int(val['value'])) / float(val['divisor'])
def fetch_raw(url):
# Perform authentication and get the cookie
auth_formdata = {'language': 'en',
'username': username,
'password': password,
'submit': 'Login',
}
r = requests.post(url, data=auth_formdata)
pksession = r.cookies['pksession']
cookies = { 'pksession': pksession,
'language': 'en' }
params = { 'action': 'get',
'attr': '1',
}
# These are the headers used by the supplied application
# It mostly doesn't matter what we pass but the backend
# breaks with a lua error without a Accept-Language header:
headers = {'Accept': 'application/json',
'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8',
'Accept-Language': 'en',
}
# The items to fetch are passed as simple json string
payload = json.dumps(items.keys())
r = requests.post(url,
data=payload,
params=params,
cookies=cookies,
headers=headers)
if hasattr(r.json, '__call__'):
ret = r.json()
else: # in requests 0.12 json isn't a callable
ret = r.json
if debug:
print >>sys.stderr, ret
return ret
def fetch_values(url):
out = fetch_raw(url)
for item in out:
name = get_name(item)
if name:
print "%s.value %.2f" % (canon(name),
calc(item))
def main(args):
if not url:
print >>sys.stderr, "No ip address configured"
return 1
if len(args) > 1:
if args[1] in [ 'autoconf', 'detect' ]:
try:
fetch_raw(url)
print "yes"
return 0
except:
print "no"
return 1
elif args[1] == 'config':
try:
print_config(url)
except Exception as e:
print >>sys.stderr, "Failed to fetch config: '%s'" % e
return 1
return 0
try:
fetch_values(url)
except Exception as e:
print >>sys.stderr, "Failed to fetch values: '%s'" % e
return 1
return 0
if __name__ == "__main__":
sys.exit(main(sys.argv))
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