Check_MK local check for OMERO server which returns count of unique users logged-in to an OMERO server

omero-user-sessions-unique_users

#!/usr/bin/python
from commands import getstatusoutput
import datetime
import socket

# k.h.gillen@dundee.ac.uk
# This code is a Check_MK local check, designed to query an OMERO server via `omero sessions who`
# and return the number of logged in OMERO users to Check_MK.
# Check_MK reference: https://mathias-kettner.de/checkmk_localchecks.html
#
# License https://creativecommons.org/licenses/by/4.0/
#
# run command / exit status code from: https://pymotw.com/2/commands/ (license by-nc-sa/3.0)

# Customise these following vars for your OMERO deployment

#  Full path to OMERO CLI
omero_command = '/opt/omero/server/OMERO.server/bin/omero'

#  OMERO operating system user to run OMERO CLI
os_user_cli = 'omero-server'

#  OMERO user account username this script will use to log in to the OMERO server. 
#  Password can be in environment variable `OMERO_PASSWORD` or coded into the variable
#  `$cmd` below.
omero_user_cli = 'monitoring'

#  A file which should be readable by root only, containing the 
#  password of the OMERO account which will be used to log into OMERO
omero_user_cli_pwd_file = '/root/omero_user_cli_password.txt'

#  The OMERO user account username of the omero "public user" to be 
#  removed from "active sessions".
#    If you have no public user defined, safe to leave this as 
#    'PUBLIC'. Do not set to empty.
omero_public_user = 'PUBLIC'

# Read the password for the monitoring user from a file
# only readable by the root user
file = open(omero_user_cli_pwd_file, "r")
for line in file:
  monitoring_password = line.strip()

# Run bin/omero sessions who, removing the non-human users and pretty-printing.
# Count only unique usernames seen.
cmd = 'OMERO_PASSWORD=\"' + monitoring_password + '\" HOME=\"$(getent passwd %s | cut -d: -f6)\" sudo -E -u %s sh -c \'%s -s localhost --user %s ' % (os_user_cli, os_user_cli, omero_command, omero_user_cli) + ' ' + ' sessions who |  grep -Ev "(root|rows|guest|\-\+\-|agent|%s|%s)" | awk \"{ print \$1  }\" | sort | uniq | wc -l\'' % (omero_public_user, omero_user_cli)

status, text = getstatusoutput(cmd)
exit_code = status >> 8 # high byte

debug = False
if debug:
    print 'Ran: "%s"' % cmd
    print 'Status: x%04x' % status
    # Output from command:
    print 'Output: %s' % text
    print 'Just the count of users?: %s' % text.split('\n', 1)[1]
    print

exit = '%d' % (exit_code)
# above is a string

if debug:
    exit = '1' # debugging, testing with other exit codes
    print 'Just the exit code: %s' % (exit)

# Example format:
# echo "0 omero-user-sessions count=${user_sessions}  OK - ${user_sessions} OMERO users logged in at $(date)"

# The number of logged-in users is in the var 'text'

# If exit code 0, then return OK to check_mk along with user count
# string comparison
if exit == '0':
    # Okay, we've likely got good output from our command. Let's populate the vars we require from command output.
    count_of_users = text.split('\n', 1)[1]
    # Exit code of OMERO command is == status to check_mk, i.e.
    # if the command worked, check is OK.
    print '%s omero-user-sessions-unique_users count=%s OK - %s total unique OMERO (non system, public or monitoring) user(s) connected at %s, output: %s' % (exit, count_of_users, count_of_users,  datetime.datetime.now().strftime('%c'), text)
else:
    print '%s omero-user-sessions-unique_users count=0 CRITICAL - Problem with the omero user sessions command, investigate script in /usr/share/check-mk-agent/local on host %s ' % (exit, socket.gethostname())