#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# vim: set sts=4 sw=4 encoding=utf-8

# Based on plugins from https://github.com/pcdummy/mongomon
# Copyright (c) 2015, Tomas Zvala
# Copyright (c) 2010, Rene Jochum
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#    * Redistributions of source code must retain the above copyright
#      notice, this list of conditions and the following disclaimer.
#    * Redistributions in binary form must reproduce the above copyright
#      notice, this list of conditions and the following disclaimer in the
#      documentation and/or other materials provided with the distribution.
#    * Neither the name of the Rene Jochum nor the
#      names of its contributors may be used to endorse or promote products
#      derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

# #%# family=auto
# #%# capabilities=suggest autoconf


import pymongo
from operator import itemgetter
from os import getenv

settings_host = '127.0.0.1'
settings_port = 27017
# mongodb_uri will override host and port
settings_mongodb_uri = ''
settings_db = 'admin'
settings_user = ''
settings_password = ''
settings_ignoredb = {}
settings_graph_category = getenv('graph_category', 'db')

typeIndex = {}
typeIndex['collcount'] = {}
typeIndex['collcount']['index'] = 'count'
typeIndex['collcount']['title'] = 'per collection document count'
typeIndex['collcount']['yaxis'] = 'documents'
typeIndex['collcount']['base'] = '1000'
typeIndex['collcount']['scale'] = '--logarithmic -l1'
typeIndex['collcount']['category'] = settings_graph_category

typeIndex['collsize'] = {}
typeIndex['collsize']['index'] = 'size'
typeIndex['collsize']['title'] = 'per collection data size'
typeIndex['collsize']['yaxis'] = 'Byte'
typeIndex['collsize']['base'] = '1024'
typeIndex['collsize']['scale'] = '--logarithmic -l1 --units=si'
typeIndex['collsize']['category'] = settings_graph_category

typeIndex['avgsize'] = {}
typeIndex['avgsize']['index'] = 'avgObjSize'
typeIndex['avgsize']['title'] = 'average object size'
typeIndex['avgsize']['yaxis'] = 'Byte'
typeIndex['avgsize']['base'] = '1024'
typeIndex['avgsize']['scale'] = '--logarithmic --units=si'
typeIndex['avgsize']['category'] = settings_graph_category

typeIndex['storage'] = {}
typeIndex['storage']['index'] = 'storageSize'
typeIndex['storage']['title'] = 'per collection storage size'
typeIndex['storage']['yaxis'] = 'Byte'
typeIndex['storage']['base'] = '1024'
typeIndex['storage']['scale'] = '--logarithmic -l1 --units=si'
typeIndex['storage']['category'] = settings_graph_category

typeIndex['indexsize'] = {}
typeIndex['indexsize']['index'] = 'totalIndexSize'
typeIndex['indexsize']['title'] = 'per collection index size'
typeIndex['indexsize']['yaxis'] = 'Byte'
typeIndex['indexsize']['base'] = '1024'
typeIndex['indexsize']['scale'] = '--logarithmic -l 1 --units=si'
typeIndex['indexsize']['category'] = settings_graph_category


def getCollstats(graphtype):
    if settings_mongodb_uri:
        con = pymongo.MongoClient(settings_mongodb_uri)
    else:
        con = pymongo.MongoClient(settings_host, int(settings_port))

    if settings_user:
        db = con[settings_db]
        db.authenticate(settings_user, settings_password)

    stats_tmp = {}
    for dbname in con.list_database_names():
        if dbname in settings_ignoredb:
            continue
        db = con[dbname]
        for coll in db.list_collection_names():
            if coll.startswith('system.'):
                continue
            stats = db.command("collstats", coll)
            collname = dbname + "_" + coll.replace('.', '_')
            if collname not in stats_tmp:
                stats_tmp[collname] = {}
                stats_tmp[collname]['value'] = 0
                stats_tmp[collname]['dbname'] = dbname
            if typeIndex[graphtype]['index'] in stats:
                stats_tmp[collname]['value'] += int(stats[typeIndex[graphtype]['index']])

    con.close()

    for collname, item in sorted(stats_tmp.items()):
        yield ("%s" % collname, item['value'], item['dbname'])


def doData(base, graphtype):
    lastdb = ""
    for coll, stats, db in sorted(getCollstats(graphtype), key=itemgetter(2)):
        if lastdb != db:
            print("multigraph " + base + "_" + graphtype + "_" + db)
            lastdb = db
        print("%s_%s.value %s" % (graphtype, coll, stats))


def doConfig(base, graphtype):

    lastdb = ""
    for k, v, d in sorted(getCollstats(graphtype), key=itemgetter(2)):
        if lastdb != d:
            print("multigraph " + base + "_" + graphtype + "_" + d)
            lastdb = d
            print("graph_title MongoDB " + typeIndex[graphtype]['title'] + " for database " + d)
            print("graph_args --base " + typeIndex[graphtype]['base'] + " " + typeIndex[graphtype]['scale'])
            print("graph_vlabel " + typeIndex[graphtype]['yaxis'])
            print("graph_category %s" % settings_graph_category)
        print("%s_%s.label %s" % (graphtype, k, k))
        print("%s_%s.min 0" % (graphtype, k))
        print("%s_%s.draw LINE1" % (graphtype, k))


def doSuggest():
    print("keys")
    for k in typeIndex.keys():
        print(k)


if __name__ == "__main__":
    from sys import argv, exit
    from os import environ, path
    import re

    # Could be done by a for loop
    # but i think if's are faster
    if 'host' in environ:
        settings_host = environ['host']
    if 'port' in environ:
        settings_port = environ['port']
    if 'db' in environ:
        settings_db = environ['db']
    if 'username' in environ:
        settings_user = environ['username']
    if 'password' in environ:
        settings_password = environ['password']
    if 'ignoredb' in environ:
        settings_ignoredb = environ['ignoredb'].split(',')
    if 'mongodb_uri' in environ:
        settings_mongodb_uri = environ['mongodb_uri']
    if 'MONGO_DB_URI' in environ:
        settings_mongodb_uri = environ['MONGO_DB_URI']
    m = re.search('^(.*)_([a-zA-Z0-9]*)$', path.basename(argv[0]))
    if len(argv) < 2:
        doData(m.group(1), m.group(2))
    elif argv[1] == "config":
        doConfig(m.group(1), m.group(2))
    elif argv[1] == "autoconf":
        print("yes")
    elif argv[1] == "suggest":
        doSuggest()
    else:
        print("invalid argument")
        exit(1)