Parsing file via Python

Question

Please help me to parse the file of Nagios config via Python script. I got the array with hostnames, and from this need to parse file and get their members. How i can do this?

There is my code :

import os
hostgroups=os.popen('grep hostgroup_name /var/log/nagios/objects.cache | cut -f3').read().split('\n')
for i in hostgroups[:-1]:
 print i

how parse file again or what to do to get members. Example see below :

define hostgroup {
 hostgroup_name test
 alias test
 members server1,server2
 }

Thanks.

Answer 1

Maybe you should parse the file with python instead of grep:

For example:

with open("/var/log/nagios/objects.cache") as nagiosFile:
 hostgroups = {}
 hostgroup_name = None
 for line in nagiosFile.readlines():
 if "hostgroup_name" in line:
 hostgroup_name = line.split()[-1]
 if "members" in line:
 for members in line.split():
 hostgroups[hostgroup_name] = members.split(",")
 print hostgroups

• Just Me: yeah, this. It's can help. But issue in the next - some hosgroups didn't have any members, so how i know, this code will be crashed, no?
• djangoliv: This code will not crash but the result will be false. This is just an example... You need to adapt it for your specific need.