#!/usr/bin/python

#
# Imports
#
import os
import sys
import time
import commands
import argparse


#
# Methods
#
def get_disk_usage(path, human_readable):
    '''disk usage in human readable format (e.g. '2,1GB')'''
    arguments = '-sh' if human_readable else '-s'
    path = os.path.realpath(path)
    command = 'sudo du %s %s' % (arguments, path)
    status, output = commands.getstatusoutput(command)

    if status is not 0:
        raise Exception(command)

    disk_usage = output.split()[0]
    if not human_readable:
        # du reports in units of 1024 bytes, convert to plain number of bytes
        disk_usage = int(disk_usage) * 1024
    return disk_usage

#
# Directories to scan
#
hostname = 'server'
interval = 10
directories = [
   #['bram',        '/media/data/Personal/Bram'],
    ['rik',         '/media/data/Personal/Rik'],
    ['books',       '/media/data/Shared/Books'],
    ['games',       '/media/data/Shared/Games'],
    ['misc',        '/media/data/Shared/Miscellaneous'],
    ['shows',       '/media/data/Shared/Video/Shows'],
    ['movies',      '/media/data/Shared/Video/Movies'],
    ['music',       '/media/data/Shared/Music'],
    ['photographs', '/media/data/Shared/Photographs'],
    ['pictures',    '/media/data/Shared/Pictures'],
    ['raw',         '/media/data/Shared/Raw'],
    ['software',    '/media/data/Shared/Software']
]

#
# Command line arguments
#
parser = argparse.ArgumentParser(description='Get BTRFS disk usage')
parser.add_argument('-s', action='store_true', help='print in human readable format')
args = parser.parse_args()
human_readable = args.s


#
# Main
#
if (human_readable):
    for (name, path) in directories:
        disk_usage = get_disk_usage(path, human_readable)
        print('%s: %s' % (name, disk_usage))
else:
    # RRD mode
    while True:
        for (name, path) in directories:
            disk_usage = get_disk_usage(path, human_readable)
            timestamp = int(time.time())
            size = float(disk_usage)
            print('PUTVAL {}/exec-du_{}/gauge-size {}:{:.1f}'.format(hostname, name, timestamp, size))
            sys.stdout.flush()
        time.sleep(interval)