#!/usr/bin/python3

import sys

with open('/proc/meminfo', 'r') as f:
    lines = f.read().splitlines()

mem = {x.split(':',1)[0] : int( x.split(':',1)[1].replace('kB', '').lstrip().rstrip() ) for x in lines}

mem['MemUsed'] = mem['MemTotal'] - mem['MemFree'] - mem ['Cached'] - mem['SReclaimable'] - mem['Buffers']
mem['SwapUsed'] = mem['SwapTotal'] - mem['SwapFree']

mem['OverallUsed'] = mem['MemUsed'] + mem['SwapUsed']

ratio = float(mem['OverallUsed']) / float(mem['MemTotal']) * 100.0


#print('MemTotal:    %8.2f MB' % (mem['MemTotal']/1024) )
#print('OverallUsed: %8.2f MB' % (mem['OverallUsed']/1024) )
#print('Ratio:       %8.2f %%' % ratio )
#print('MemUsed:     %8.2f MB' % (mem['MemUsed']/1024) )
#print('SwapUsed:    %8.2f MB' % (mem['SwapUsed']/1024) )

out = 'MemRatio: %.1f%%/%.1fGB of %.1fGB RAM (and %.1fGB Swap) used' % ( ratio, (mem['OverallUsed']/1024.0/1024.0), (mem['MemTotal']/1024.0/1024.0), (mem['SwapTotal']/1024.0/1024.0) )

if ratio > 150.0:
	exitcode = 2
	exitstr = 'CRITICAL'
elif ratio > 100.0:
	exitcode = 1
	exitstr = 'WARNING'
else:
	exitcode = 0
	exitstr = 'OK'

multiout = []
for label in ['MemTotal', 'OverallUsed', 'MemUsed', 'SwapTotal', 'SwapUsed']:
	multiout.append('%s: %.4fGB' % (label, float(mem[label])/1024.0/1024.0))

perfdata = []
for label in ['MemTotal', 'OverallUsed', 'MemUsed', 'SwapTotal', 'SwapUsed']:
	perfdata.append('%s=%dB;;;;' % (label, mem[label]*1024) )


print(exitstr + ' - ' + out + '|' + ' '.join(perfdata))
print('\n'.join(multiout))
sys.exit(exitcode)