# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# This file was forked from dstat's mysql5_innodb plugin but retains none of
# that original code other than a list of well known MySQL variable names.

import logging
import os

import pymysql
from six.moves import configparser

from openstack_qa_tools import error

COLLECT_COUNTERS = (
    'Com_delete',
    'Com_insert',
    'Com_select',
    'Com_update',
    'Connections',
    'Innodb_buffer_pool_read_requests',
    'Innodb_data_reads',
    'Innodb_data_writes',
    'Innodb_log_writes',
    'Innodb_rows_deleted',
    'Innodb_rows_inserted',
    'Innodb_rows_read',
    'Innodb_rows_updated',
    'Queries',
    'Slow_queries',
)


def _get_config():
    args = {}
    try:
        with open(os.path.expanduser("~/.my.cnf")) as dfile:
            parser = configparser.ConfigParser()
            parser.readfp(dfile)
            for k, v in parser.items('client'):
                args[k] = v
    except IOError as e:
        raise error.CollectionError(str(e))
    return args


def collect():
    log = logging.getLogger()
    args = _get_config()
    conn = pymysql.connect(**args)
    cursor = conn.cursor()
    counters = {}
    cursor.execute('show global status')
    while True:
        result = cursor.fetchone()
        if result is None:
            break
        k, v = result
        if k in COLLECT_COUNTERS:
            counters[k] = int(v)
    log.debug(counters)
    return counters