#!/usr/bin/env python3

# Copyright (C) 2009 Andreas Thienemann <andreas@bawue.net>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU Library General Public License as published by
# the Free Software Foundation; version 2 only
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Library General Public License for more details.
#
# You should have received a copy of the GNU Library General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#
#
#
# Munin Plugin to get storage device throughput for Bacula by parsing the bconsole
# output.
#
# Parameters:
#
#    config   (required)
#    autoconf (optional - only used by munin-config)
#
#
# Magic markers (optional - only used by munin-config and some
# installation scripts):
#
#  #%# family=contrib
#  #%# capabilities=autoconf

import subprocess
import sys
import re
import os


def parse_devices():
    """ Parse the bconsole output once to get the device names """

    bconsole = subprocess.Popen("bconsole", stdin=subprocess.PIPE, stdout=subprocess.PIPE)
    stdout, stderr = bconsole.communicate("status\n2")

    devs = []

    # Hold the line numbers for devices
    dev_line = []
    input_lines = stdout.split("\n")

    for line, i in zip(input_lines, range(0, len(input_lines))):
        if line.startswith("Connecting to Storage daemon "):
            hostname = line.split()[-1].split(":")[0]
        if line.startswith("Device \""):
            dev_line.append(i)

    for pos in dev_line:
        # Get the device name
        dev_name = input_lines[pos].split()[1][1:-1]
        dev_dev = input_lines[pos].split()[2][1:-1]
        dev_dev_clean = re.sub("^[^A-Za-z_]", "_", dev_dev, 1)
        dev_dev_clean = re.sub("[^A-Za-z0-9_]", "_", dev_dev_clean, 0)
        devs.append([dev_name, dev_dev, dev_dev_clean])

    return hostname, devs


def parse():
    """ Parse the bconsole output """

    bconsole = subprocess.Popen("bconsole", stdin=subprocess.PIPE, stdout=subprocess.PIPE)
    stdout, stderr = bconsole.communicate("status\n2")

    devstats = []

    # Hold the line numbers for devices
    dev_line = []
    input_lines = stdout.split("\n")

    for line, i in zip(input_lines, range(0, len(input_lines))):
        if line.startswith("Device \""):
            dev_line.append(i)

    for pos in dev_line:
        # Get the device name
        dev_dev = input_lines[pos].split()[2][1:-1]
        dev_dev_clean = re.sub("^[^A-Za-z_]", "_", dev_dev, 1)
        dev_dev_clean = re.sub("[^A-Za-z0-9_]", "_", dev_dev_clean, 0)

        # Get the current bytes
        if input_lines[pos].endswith("is mounted with:"):
            bytes_count_text = input_lines[pos + 5].split()[1].split("=")[1].replace(",", "")
            try:
                bytes_count = long(bytes_count_text)
            except NameError:
                bytes_count = int(bytes_count_text)
            devstats.append([dev_dev, dev_dev_clean, bytes_count])
        else:
            devstats.append([dev_dev, dev_dev_clean, 0])

    return devstats


def print_config():
    hostname, devstats = parse_devices()
    print("graph_title Bacula Storage Daemon throughput")
    print("graph_vlabel bytes per ${graph_period}")
    print("graph_args --base 1024 -l 0")
    print("graph_scale yes")
    print("graph_info Bacula Storage Daemon througput measurement based on written bytes. "
          "This may be somewhat inaccurate whenever a tape is changed.")
    print("graph_category backup")
    print("graph_order", " ".join([dev[2] for dev in devstats]))
    print()
    if (os.getenv("report_hostname") is not None
            and (os.getenv("report_hostname").upper() in ["YES", "TRUE", "1", "Y"])):
        print("host_name", hostname)
    for dev in devstats:
        print("%s.label %s" % (dev[2], dev[1]))
        print("%s.type DERIVE" % (dev[2]))
        print("%s.min 0" % (dev[2]))
#       print("%s.max %s" % (dev[2], str(1024*1024*1024*16)))
#       print("%s.cdef up,8,*" (dev[2]))
    sys.exit(0)


if "config" in sys.argv[1:]:
    print_config()
elif "autoconf" in sys.argv[1:]:
    for directory in os.getenv("PATH").split(":"):
        for root, dirs, files in os.walk(directory):
            if "bconsole" in files:
                print("yes")
                sys.exit(0)
    print("no")
    sys.exit(0)
elif "suggest" in sys.argv[1:]:
    sys.exit(1)
else:
    for dev in parse():
        print("%s.value %s" % (dev[1], dev[2]))