#!/usr/bin/env python
import optparse
from subprocess import Popen, PIPE
import re

def main():
    p = optparse.OptionParser(description="Python wrapped snmpdf command",
                                prog="pysnmpdf",
                                version="0.1a",
                                usage="%prog machine")
    p.add_option("-c", "--community", help="snmp community string")
    p.add_option("-V", "--Version", help="snmp version to use")
    p.set_defaults(community="public",Version="2c")
    options, arguments = p.parse_args()
    SNMPDF = "snmpdf"
    if len(arguments) == 1:
        machine = arguments[0]

        #We create a nested generator function
        def parse():
            """Returns generator object with line from snmpdf"""
            ps = Popen([SNMPDF, "-c", options.community,
                        "-v",options.Version, machine],
                        stdout=PIPE, stderr=PIPE)
            return ps.stdout

        #Generator Pipeline To Search For Critical Items
        pattern = "9[0-9]%"
        outline = (line.split() for line in parse())
        flag = (" ".join(row) for row in outline if re.search(pattern, row[-1]))
        for line in flag:
            print "%s CRITICAL" % line
        #Sample Return Value
        #Real Memory 2067636 1974120 93516 95% CRITICAL

    else:
        p.print_help()
if __name__ == '__main__':
    main()