Munin plugin for monitoring Squid use of file descriptors

munin_squid_fd.p

#!/usr/bin/python

import os
import re
import sys

from subprocess import Popen, PIPE

def main():
    output = Popen(["squidclient", "mgr:info"], stdout=PIPE).communicate()[0]
    output = [x.strip() for x in output.splitlines()]
    
    if len(sys.argv) == 1:
        data = {}
        for line in output:
            k = line.split(':')[0]
            v = ':'.join(line.split(':')[1:])
            data[k.strip()] = v.strip()
        if os.environ.get('DUMPDATA', False):
            print data
        max_fd = data.get('Maximum number of file descriptors', '-1')
        largest_fd = data.get('Largest file desc currently in use', '-1')
        inuse_fd = data.get('Number of file desc currently in use', '-1')
        queued_fd = data.get('Files queued for open', '-1')
        print "max_fd.value %s" % max_fd
        print "largest_fd.value %s" % largest_fd
        print "inuse_fd.value %s" % inuse_fd
        print "queued_fd.value %s" % queued_fd
        sys.exit(0)
    else:
        if sys.argv[1] == 'config':
            # File descriptor usage for squid:
            # 	Maximum number of file descriptors:   4096
            # 	Largest file desc currently in use:   1082
            # 	Number of file desc currently in use:  913
            # 	Files queued for open:                   0
            print "graph_title Squid file descriptors"
            print "graph_category squid"
            print "graph_args --base 1000"
            print "graph_vlabel number of fd"
            print "graph_order max_fd largest_fd inuse_fd queued_fd"
            print "max_fd.label Max. number of fd"
            print "max_fd.colour 0000ff"
            print "largest_fd.label Largest fd in use"
            print "largest_fd.colour ff0000"
            print "inuse_fd.label Currently fd in use"
            print "inuse_fd.colour 00ff00"
            print "queued_fd.label Queued fd for open"
            print "queued_fd.colour 000000"
        else:
            print "ERROR: debe ejecutarse sin parametros, o con 'config'"
            sys.exit(1)
    
if __name__ == '__main__':
    main()