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Editing: statsnotifier.py

#!/opt/cloudlinux/venv/bin/python3 -bb
# -*- coding: utf-8 -*-
#
# Copyright © Cloud Linux GmbH & Cloud Linux Software, Inc 2010-2021 All Rights Reserved
#
# Licensed under CLOUD LINUX LICENSE AGREEMENT
# http://cloudlinux.com/docs/LICENSE.TXT
#
# Author: Igor Seletskiy <iseletsk@cloudlinux.com>
#         Alexander Grynchuk <agrynchuk@cloudlinux.com>
#         Illarion Kovalchuk <ikovalchuk@cloudlinux.com>
#

# pylint: disable=too-many-lines

import itertools
import json
import locale
import logging
import os
import pwd
import re
from datetime import datetime, timedelta
from email import message_from_string
from email.header import Header
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
from functools import reduce
from itertools import groupby
from typing import Dict, Iterable, Iterator, List, NamedTuple, Optional, Tuple  # NOQA

from prettytable import ALL, PrettyTable

from clcommon import clemail, clproc, cpapi
from clcommon.clproc import LIMIT_LVP_ID
from clcommon.cpapi import admins, cpinfo, get_admin_locale, get_user_login_url
from clcommon.cpapi.plugins.universal import get_admin_email as system_admin_email
from clcommon.mail_helper import MailHelper
from clconfig.lve_stats2_lib import get_notification as get_admin_notification
from lveapi import NameMap
from lvestats.core.plugin import LveStatsPlugin
from lvestats.lib.commons import dateutil
from lvestats.lib.commons.func import (
    deserialize_lve_id,
    gcd,
    get_hostname,
    merge_dicts,
    serialize_lve_id,
    user_should_be_notified,
)
from lvestats.lib.commons.sizeutil import mempages_to_bytes
from lvestats.lib.lveinfolib import FIELD_AVERAGE, FIELD_FAULT, FIELD_LIMIT, HistoryShowUnion, get_lve_version
from lvestats.lib.notifications_helper import NotificationsHelper

try:
    # Just for backward compatibility with not released lve-utils
    from clconfig.lve_stats2_reseller_lib import get_notification  # pylint: disable=ungrouped-imports
except ImportError:
    # Will results in a fallback to admin's settings:
    def get_notification(reseller):
        return None

DEFAULT_LOCALE = 'en_US'
ADMIN_TEMPL = 'admin_notify.txt'
ADMIN_TEMPL_HTML = 'admin_notify.html'
USER_TEMPL = 'user_notify.txt'
USER_TEMPL_HTML = 'user_notify.html'
RESELLER_FAULTS_TEMPL = 'reseller_faults_notify.txt'
RESELLER_FAULTS_TEMPL_HTML = 'reseller_faults_notify.html'
RESELLER_TEMPL = 'reseller_notify.txt'
RESELLER_TEMPL_HTML = 'reseller_notify.html'
DEFAULT_ADMIN_MAIL = system_admin_email()
DEFAULT_SUBJECT = 'Hosting account resources exceeded'

FIELDS_ALL = ['ID'] + FIELD_FAULT + ['anyF'] + FIELD_AVERAGE + FIELD_LIMIT

NotifySettings = NamedTuple(
    'NotifySettings',
    [
        ('NOTIFY_MIN_FAULTS', int),
        ('NOTIFY_INTERVAL', int),
    ],
)

NotifyFaultsOptions = NamedTuple(
    'NotifyFaultsOptions',
    [
        ('NOTIFY_CPU', bool),
        ('NOTIFY_IO', bool),
        ('NOTIFY_IOPS', bool),
        ('NOTIFY_MEMORY', bool),
        ('NOTIFY_EP', bool),
        ('NOTIFY_NPROC', bool),
    ],
)

AdminSettings = NamedTuple(
    'AdminSettings',
    [
        ('NOTIFY_ADMIN', Optional[bool]),
        ('NOTIFY_CUSTOMERS_ON_FAULTS', Optional[bool]),
        ('NOTIFY_RESELLER_CUSTOMERS', Optional[bool]),
        ('NOTIFY_RESELLER_ON_CUSTOMERS_FAULTS', Optional[bool]),
        ('NOTIFY_FAULTS_TYPES', NotifyFaultsOptions),
        ('NOTIFY_OPTIONS_SELF', NotifySettings),
        ('NOTIFY_OPTIONS_CUSTOMER', NotifySettings),
        ('NOTIFY_FROM_EMAIL', Optional[str]),
        ('REPORT_ADMIN_EMAIL', Optional[str]),
        ('NOTIFY_SUBJECT', str),
        ('NOTIFY_CHARSET_EMAIL', Optional[str]),
    ],
)

ResellerSettings = NamedTuple(
    'ResellerSettings',
    [
        ('NOTIFY_RESELLER_ON_CUSTOMERS_FAULTS', bool),
        ('NOTIFY_CUSTOMERS_ON_FAULTS', bool),
        ('NOTIFY_RESELLER_ON_TOTAL_FAULTS', bool),
        ('NOTIFY_FAULTS_TYPES', NotifyFaultsOptions),
        ('NOTIFY_OPTIONS_SELF', NotifySettings),
        ('NOTIFY_OPTIONS_CUSTOMER', NotifySettings),
    ],
)

class StatsNotifierTemplateError(clemail.jinja2.exceptions.TemplateError):
    pass

class StatsNotifier(LveStatsPlugin):
    DEFAULT_PERIOD = 12 * 60 * 60  # 12 hours
    MIN_PERIOD = 1 * 60 * 60  # 1 hour
    TEMPLATE_DIR = '/usr/share/lve/emails/'
    TEMPLATE_CUSTOM_DIR = '/etc/cl.emails.d/'
    ADMIN_LVP_ID = 0
    LOCALE_DEFINES_FILE = 'locale_defines.json'

def __init__(self):
        self.server_id = None
        self.db_engine = None

self.lve_version = 6
        self.log = logging.getLogger('statsnotifier')
        self._load_plugin_settings()
        self.hostname = get_hostname()

self._mail_helper = MailHelper()

self._reseller_settings_cache = {}

self._proc_lve = clproc.ProcLve()
        self._name_map = NameMap()
        try:
            self.resellers = set(cpapi.resellers())
        except (cpapi.NotSupported, AttributeError):
            self.resellers = set()
        self._notifications = NotificationsHelper()

def _load_plugin_settings(self):
        """[Re]load all plugin settings"""
        self._admin_settings = self.get_admin_settings()
        self._default_reseller_settings = self.get_default_reseller_settings()

# let's wake up at least every hour (minimal period for resellers)
        # then we will iter over all resellers and do stuff
        notify_interval_admin = self._admin_settings.NOTIFY_OPTIONS_SELF.NOTIFY_INTERVAL
        notify_interval_users = self._admin_settings.NOTIFY_OPTIONS_CUSTOMER.NOTIFY_INTERVAL
        self.period = reduce(gcd, [notify_interval_admin, notify_interval_users, StatsNotifier.MIN_PERIOD])

# Set default email headers
        self._prepare_default_mail_headers()
        # Log plugin settings
        self.log.info("Config: NOTIFY_ADMIN=%s", self._admin_settings.NOTIFY_ADMIN)
        self.log.info("Config: NOTIFY_CUSTOMERS_ON_FAULTS=%s", self._admin_settings.NOTIFY_CUSTOMERS_ON_FAULTS)
        self.log.info("Config: NOTIFY_RESELLER_CUSTOMERS=%s", self._admin_settings.NOTIFY_RESELLER_CUSTOMERS)
        self.log.info(
            "Config: NOTIFY_RESELLER_ON_CUSTOMERS_FAULTS=%s", self._admin_settings.NOTIFY_RESELLER_ON_CUSTOMERS_FAULTS
        )
        self.log.info("Config: NOTIFY_CPU=%s", self._admin_settings.NOTIFY_FAULTS_TYPES.NOTIFY_CPU)
        self.log.info("Config: NOTIFY_IO=%s", self._admin_settings.NOTIFY_FAULTS_TYPES.NOTIFY_IO)
        self.log.info("Config: NOTIFY_IOPS=%s", self._admin_settings.NOTIFY_FAULTS_TYPES.NOTIFY_IOPS)
        self.log.info("Config: NOTIFY_MEMORY=%s", self._admin_settings.NOTIFY_FAULTS_TYPES.NOTIFY_MEMORY)
        self.log.info("Config: NOTIFY_EP=%s", self._admin_settings.NOTIFY_FAULTS_TYPES.NOTIFY_EP)
        self.log.info("Config: NOTIFY_NPROC=%s", self._admin_settings.NOTIFY_FAULTS_TYPES.NOTIFY_NPROC)
        self.log.info(
            "Config: NOTIFY_INTERVAL_ADMIN=%s seconds", self._admin_settings.NOTIFY_OPTIONS_SELF.NOTIFY_INTERVAL
        )
        self.log.info("Config: NOTIFY_MIN_FAULTS_ADMIN=%s", self._admin_settings.NOTIFY_OPTIONS_SELF.NOTIFY_MIN_FAULTS)
        self.log.info(
            "Config: NOTIFY_INTERVAL_USER=%s seconds", self._admin_settings.NOTIFY_OPTIONS_CUSTOMER.NOTIFY_INTERVAL
        )
        self.log.info(
            "Config: NOTIFY_MIN_FAULTS_USER=%s", self._admin_settings.NOTIFY_OPTIONS_CUSTOMER.NOTIFY_MIN_FAULTS
        )
        self.log.info("Config: NOTIFY_FROM_EMAIL=%s", self._admin_settings.NOTIFY_FROM_EMAIL)
        self.log.info("Config: REPORT_ADMIN_EMAIL=%s", self._admin_settings.REPORT_ADMIN_EMAIL)
        self.log.info("Config: NOTIFY_SUBJECT=%s", self._admin_settings.NOTIFY_SUBJECT)
        self.log.info("Config: NOTIFY_CHARSET_EMAIL=%s", self._admin_settings.NOTIFY_CHARSET_EMAIL)
        self.log.info("Config: Email subject used if locale_defines.json absent: %s", self.mail_headers['Subject'])

def _get_resellers_settings(self, with_admin=False):
        # type: (bool) -> Tuple[int, ResellerSettings]

# get notifications settings for each reseller that is present in proc/lve/list
        if self._proc_lve.resellers_supported():
            for reseller_id in self._proc_lve.lvp_id_list():
                reseller_name = self._name_map.get_name(reseller_id)
                if reseller_name is None:
                    self.log.warning(
                        "Unable to obtain notify settings: reseller %s exists "
                        "in /proc/lve/resellers, but is absent in ve.cfg.",
                        reseller_id,
                    )
                    continue
                reseller_settings = self.get_reseller_settings(reseller_name)
                yield reseller_id, reseller_settings or self._default_reseller_settings

if with_admin:
            yield self.ADMIN_LVP_ID, self._admin_settings

def _get_customers_options_filtered(self):
        # type: () -> filter
        """
        We do not need resellers with disabled
        NOTIFY_CUSTOMERS_ON_FAULTS notifications,
        also we do not need those resellers,
        whose customers were notified recently.
        Let's remove such resellers from check-list.
        """
        resellers_settings = self._get_resellers_settings(with_admin=True)

# we do not need resellers that disables their customers notification
        # also we do not need resellers that were notified recently
        def _filter_by_enabled_notifications(reseller_notify_settings):
            # type: (Tuple[int, ResellerSettings]) -> bool
            (reseller_id, notify_options) = reseller_notify_settings
            return notify_options.NOTIFY_CUSTOMERS_ON_FAULTS and self._notifications.users_need_notification(
                reseller_id, notify_options.NOTIFY_OPTIONS_CUSTOMER.NOTIFY_INTERVAL
            )

return filter(_filter_by_enabled_notifications, resellers_settings)

def _get_customers_options_grouped(self):
        # type: () -> groupby
        """
        If some resellers have same settings
        for notify we can send notifications to
        their users using only one database request.
        For that, we must group them by customers settings
        """

def _group_by_customers_options(customers_notify_settings):
            # type: (Tuple[str, Optional[ResellerSettings]]) -> Tuple[NotifySettings, NotifyFaultsOptions]
            (_, notify_options) = customers_notify_settings
            return notify_options.NOTIFY_OPTIONS_CUSTOMER, notify_options.NOTIFY_FAULTS_TYPES

return groupby(self._get_customers_options_filtered(), _group_by_customers_options)

def _get_resellers_options_filtered(self):
        # type: () -> filter
        """
        We do not need resellers with disabled notifications at all
        also we do not need resellers that were notified recently.
        Let's remove such resellers from check-list.
        """
        resellers_settings = self._get_resellers_settings()

def _filter_by_enabled_notifications(reseller_notify_options):
            # type: (Tuple[int, ResellerSettings]) -> bool
            (reseller_id, notify_options) = reseller_notify_options
            return notify_options.NOTIFY_RESELLER_ON_TOTAL_FAULTS and self._notifications.reseller_need_notification(
                reseller_id, notify_options.NOTIFY_OPTIONS_SELF.NOTIFY_INTERVAL
            )

return filter(_filter_by_enabled_notifications, resellers_settings)

def _get_resellers_options_grouped(self):
        # type: () -> groupby
        """
        If some resellers have same settings
        for notifywe can send them notifications
        using only one database request.
        For that, we must group them by settings
        """
        resellers_settings = self._get_resellers_options_filtered()

def _group_by_self_options(reseller_options_grouped):
            # type: (Tuple[int, Optional[ResellerSettings]]) -> Tuple[NotifySettings, NotifyFaultsOptions]
            (_, notify_options) = reseller_options_grouped
            return notify_options.NOTIFY_OPTIONS_SELF, notify_options.NOTIFY_FAULTS_TYPES

return groupby(resellers_settings, _group_by_self_options)

def _get_reseller_customers_faults_options_filtered(self):
        # type: () -> filter
        """Get resellers with enabled NOTIFY_ON_CUSTOMERS_FAULTS"""
        resellers_settings = self._get_resellers_settings(with_admin=True)

def _filter_by_enabled_notifications(resellers_settings):
            # type: (Tuple[int, ResellerSettings]) -> bool
            (reseller_id, notify_options) = resellers_settings
            return (
                notify_options.NOTIFY_RESELLER_ON_CUSTOMERS_FAULTS
                and self._notifications.reseller_need_notification(
                    reseller_id, notify_options.NOTIFY_OPTIONS_SELF.NOTIFY_INTERVAL
                )
            )

return filter(_filter_by_enabled_notifications, resellers_settings)

def _get_resellers_customers_faults_options_grouped(self):
        # type: () -> groupby
        resellers_settings = self._get_reseller_customers_faults_options_filtered()

def _group_by_self_options(reseller_customers_settings):
            # type: (Tuple[int, ResellerSettings]) -> Tuple[NotifySettings, NotifyFaultsOptions]
            (_, notify_options) = reseller_customers_settings
            return notify_options.NOTIFY_OPTIONS_SELF, notify_options.NOTIFY_FAULTS_TYPES

return groupby(resellers_settings, _group_by_self_options)

def _prepare_default_mail_headers(self):
        # type: () -> None
        self.mail_headers = {  # pylint: disable=attribute-defined-outside-init
            'Subject': self._admin_settings.NOTIFY_SUBJECT or DEFAULT_SUBJECT
        }

def set_config(self, config):
        self.server_id = config.get('server_id', 'localhost')

def set_db_engine(self, engine):
        self.db_engine = engine
        self.lve_version = get_lve_version(engine, self.server_id)

@staticmethod
    def _get_panel_login_url(domain):
        # type: (str) -> str
        try:
            return get_user_login_url(domain)
        except cpapi.NotSupported:
            return f'http://{domain}/'

@staticmethod
    def get_locales(localename):
        # type: (str) -> str
        normalized = locale.normalize(localename).split('.')[0]
        if not re.match(r'\A[a-zA-Z0-9_]+\Z', normalized):
            return DEFAULT_LOCALE
        return normalized

def get_users_fault(self, period, notify_min_faults, notify_faults_types, uids=None):
        # type: (int, int, NotifyFaultsOptions, List[int]) -> List[Dict]
        """
        Get statistics for given period;
        """
        period_to = datetime.utcnow()
        period_from = period_to - timedelta(seconds=period)

by_fault_arg = self._get_faults_keys(notify_faults_types)
        if not by_fault_arg:
            return []

history_show = HistoryShowUnion(
            self.db_engine,
            period_from,
            period_to,
            server_id=self.server_id,
            show_columns=FIELDS_ALL,
            order_by='anyF',
            by_fault=by_fault_arg,
            threshold=notify_min_faults,
            uid=uids,
        )
        users_fault_data = history_show.proceed_dict()

users_stats = []
        for user_stat in users_fault_data:
            user_stat['PERIOD'] = period

# convert mempages to kbytes
            user_stat.update(
                {
                    key: mempages_to_bytes(val) // 1024
                    for key, val in user_stat.items()
                    if key in ('aVMem', 'aPMem', 'lVMem', 'lPMem')
                }
            )

# convert bytes/s to kbytes/s
            user_stat.update({key: val // 1024 for key, val in user_stat.items() if key in ('aIO', 'lIO')})

users_stats.append(user_stat)
        return users_stats

@staticmethod
    def _get_faults_keys(notify_types_options):
        # type: (NotifyFaultsOptions) -> List[str]
        """
        Get list of keys for 'by_faults';
        If reseller_settings is not None, use admin settings;
        Else - use reseller's settings;
        """
        by_fault_arg = itertools.compress(
            ['CPUf', 'VMemF', 'PMemF', 'EPf', 'NprocF', 'IOf', 'IOPSf'],
            [
                notify_types_options.NOTIFY_CPU,
                notify_types_options.NOTIFY_MEMORY,  # deprecated
                notify_types_options.NOTIFY_MEMORY,
                notify_types_options.NOTIFY_EP,
                notify_types_options.NOTIFY_NPROC,
                notify_types_options.NOTIFY_IO,
                notify_types_options.NOTIFY_IOPS,
            ],
        )
        return list(by_fault_arg)

def _get_resellers_data(self, faults_data):
        # type: (Iterable[Dict]) -> Iterator[Dict]
        """
        Get information about reseller's accounts;
        """
        for reseller_data in faults_data:
            reseller_id, _ = deserialize_lve_id(reseller_data['ID'])
            reseller_data['LOGIN'] = self._name_map.get_name(reseller_id)

try:
                cp_userinfo = cpapi.cpinfo(reseller_data['LOGIN'], keyls=('mail', 'locale'), search_sys_users=False)[0]
            except (cpapi.cpapiexceptions.NotSupported, IndexError):
                continue

reseller_data['TOMAIL'] = cp_userinfo[0]
            reseller_data['LOCALE'] = self.get_locales(cp_userinfo[1] or 'en')

yield reseller_data

def get_users_data(self, fault_users_data):
        # type: (Iterable[Dict]) -> List[Dict]
        """
        Get information about end user's accounts;
        """
        users_data = []
        for user_data in fault_users_data:
            user_id, _ = deserialize_lve_id(int(user_data['ID']))
            try:
                user_pwd_data = pwd.getpwuid(user_id)
                user_data['LOGIN'] = user_pwd_data.pw_name
                user_data['TONAME'] = user_pwd_data.pw_gecos.split(',')[0]
            except KeyError:
                continue

try:
                cp_userinfo = cpapi.cpinfo(user_data['LOGIN'], keyls=('mail', 'dns', 'locale', 'reseller'))[0]
            except (IndexError, cpapi.cpapiexceptions.NotSupported):
                continue

user_data['TOMAIL'] = cp_userinfo[0]  # user's email
            user_data['DOMAIN'] = cp_userinfo[1]  # user's domain
            user_data['LOCALE'] = self.get_locales(cp_userinfo[2] or 'en')
            # Old key presents for backward compatibility
            user_data['RESELLER'] = cp_userinfo[3]  # reseller name
            # Fixed reseller key without misspeling
            # Now it works as it should be according to docs
            user_data['RESELLER'] = cp_userinfo[3]  # reseller name
            user_data['HOSTNAME'] = self.hostname  # server hostname
            user_data['LOGIN_URL'] = self._get_panel_login_url(cp_userinfo[1])
            user_data['FROMMAIL'] = self._get_notify_from_mail(user_data['RESELLER'])

users_data.append(user_data)
        return users_data

def _get_notify_from_mail(self, reseller):
        # type: (str) -> str
        """
        If reseller is admin -> send email from admin's mail
        If reseller is reseller -> send email from reseller's mail
        """
        from_mail = self._admin_settings.NOTIFY_FROM_EMAIL
        # probably we should replace condition with `not is_admin(reseller)`
        if reseller in self.resellers:
            try:
                # TODO: add NOTIFY_FROM_EMAIL option for reseller
                from_mail = cpapi.cpinfo(reseller, keyls=('mail',), search_sys_users=False)[0][0]
            except (IndexError, cpapi.cpapiexceptions.NotSupported):
                self.log.exception("can't obtain notify_from_mail for %s from cpapi", reseller)
        return from_mail

def _detect_admin_email(self):
        # type: () -> str
        """
        Determine server admin email;
        Priority:
        1. report_admin_email from config
        2. cpapi.get_admin_email()
        3. DEFAULT_ADMIN_MAIL
        """
        try:
            email = self._admin_settings.REPORT_ADMIN_EMAIL or cpapi.get_admin_email()
        except cpapi.NotSupported:
            email = None
        if not email:
            email = DEFAULT_ADMIN_MAIL
            self.log.warning(
                "Can't obtain admin email from control panel. System admin email will be used '%s'",
                email,
            )
        return email

def _detect_path_for_file(self, locale_name: str, templ_filename: str) -> Tuple[str, str]:
        """
        Detects path for specified file. Checks directories in order:
            1. self.TEMPLATE_CUSTOM_DIR = '/etc/cl.emails.d/<locale_name>'
            2. self.TEMPLATE_DIR = '/usr/share/lve/emails/<locale_name>'
        :param locale_name: locale name to check
        :param templ_filename: template filename (without path)
        :return: Tuple: (file_dir, full_path_to_file)
        """
        # 1. check self.TEMPLATE_CUSTOM_DIR
        templates_dir = os.path.join(self.TEMPLATE_CUSTOM_DIR, locale_name)
        full_filename = os.path.join(templates_dir, templ_filename)
        if os.path.exists(full_filename):
            return templates_dir, full_filename
        # 2. check self.TEMPLATE_DIR
        templates_dir = os.path.join(self.TEMPLATE_DIR, locale_name)
        return templates_dir, os.path.join(templates_dir, templ_filename)

def generate_msg_body(self, templ_data: dict, text_templ_name: str, html_templ_name: str = None):
        locale_name = templ_data.get('LOCALE', DEFAULT_LOCALE)
        templates_dir, text_templ_path = self._detect_path_for_file(locale_name, text_templ_name)
        if not os.path.exists(templates_dir) or not os.path.exists(text_templ_path):
            logging.info(
                "Unable to find templates for locale '%s': file '%s' does not exist. "
                "Statsnotifier will use default templates with locale %s. See "
                "https://docs.cloudlinux.com/cloudlinux_os_components/#customize-lve-stats2-notifications"
                " in order to find how to create localized template and hide this warning.",
                locale_name,
                text_templ_path,
                DEFAULT_LOCALE,
            )
            templates_dir, text_templ_path = self._detect_path_for_file(DEFAULT_LOCALE, text_templ_name)

# html part is optional, just print warning when it is absent
        if html_templ_name:
            html_templ_path = os.path.join(templates_dir, html_templ_name)
            if not os.path.exists(html_templ_path):
                logging.info(
                    "Unable to find optional HTML message template '%s'. "
                    "Sending email with only TEXT part."
                    "You can safely ignore this message if you "
                    "do not want to use HTML email templates."
                    "See https://docs.cloudlinux.com/cloudlinux_os_components/#customize-lve-stats2-notifications",
                    html_templ_path,
                )
                html_templ_path = None
        else:
            html_templ_path = None

_templ_name = text_templ_name

# Load data from /usr/share/lve/emails/<locale_name>/locale_defines.json file
        # locale_defines example:
        # {'NOTIFY_FROM_SUBJECT': 'Ваш сервер болен',
        #                'PERIOD': {'days': 'дней', 'hours': 'часов', 'minutes': 'минут', 'seconds': 'секунд'},
        #                'TONAME': {'admin': 'Админ', 'reseller': 'Reseller', 'customer': 'Server user'}
        #                }
        locale_defines = self._load_locales_data(templates_dir)
        # Fill localized data according to self._locale_defines
        try:
            templ_data['TONAME'] = locale_defines['TONAME'][templ_data['user_type']]
        except KeyError:
            pass
        try:
            number, english_name = dateutil.seconds_to_human_view(templ_data['PERIOD'])
            try:
                localized_period_name = locale_defines['PERIOD'][english_name]
            except KeyError:
                localized_period_name = english_name
            templ_data['PERIOD'] = f'{number} {localized_period_name}'
        except KeyError:
            pass

html_body = None
        try:
            subject, text_body = clemail.ClEmail.generate_mail_jinja2(text_templ_path, templ_data=templ_data)

if html_templ_path:
                _templ_name = html_templ_name
                _, html_body = clemail.ClEmail.generate_mail_jinja2(html_templ_path, templ_data=templ_data)

except (clemail.jinja2.exceptions.TemplateError, IOError) as e:
            raise StatsNotifierTemplateError(
                f'Can not generate message for user "{templ_data.get("LOGIN")}"; '
                f'template "{os.path.join(locale_name, _templ_name)}". Jinja2: {e}'
            ) from e
        # Put subject from locales
        s_subject = locale_defines.get('NOTIFY_FROM_SUBJECT', subject)
        return s_subject, text_body, html_body

def generate_msg(self, templ_data: dict, text_templ_name: str, html_templ_name: str = None) -> MIMEMultipart:
        subject, text_body, html_body = self.generate_msg_body(templ_data, text_templ_name, html_templ_name)
        if html_body:  # generate multipart message text + html
            # Clear "text" and "html" data from unreadable symbols
            text_body = text_body.encode(self._admin_settings.NOTIFY_CHARSET_EMAIL, 'xmlcharrefreplace').decode(
                self._admin_settings.NOTIFY_CHARSET_EMAIL
            )
            html_body = html_body.encode(self._admin_settings.NOTIFY_CHARSET_EMAIL, 'xmlcharrefreplace').decode(
                self._admin_settings.NOTIFY_CHARSET_EMAIL
            )

# Attach parts into message container.
            # According to RFC 2046, the last part of a multipart message,
            # in this case
            # the HTML message, is best and preferred.
            msg = MIMEMultipart('alternative')
            msg.attach(MIMEText(text_body, 'plain', self._admin_settings.NOTIFY_CHARSET_EMAIL))
            msg.attach(MIMEText(html_body, 'html', self._admin_settings.NOTIFY_CHARSET_EMAIL))
        else:  # generate simple message (text only)
            text_body = text_body.encode(self._admin_settings.NOTIFY_CHARSET_EMAIL, 'xmlcharrefreplace').decode(
                self._admin_settings.NOTIFY_CHARSET_EMAIL
            )
            msg = message_from_string(text_body)
            msg.add_header('Content-Type', f'text/plain; charset="{self._admin_settings.NOTIFY_CHARSET_EMAIL}"')
            msg.add_header('Content-Transfer-Encoding', '8bit')

# configure message headers
        msg['Subject'] = Header(subject or self.mail_headers['Subject'], 'utf-8').encode()
        msg['From'] = templ_data.get('FROMMAIL') or self._admin_settings.NOTIFY_FROM_EMAIL
        msg['To'] = templ_data['TOMAIL']
        return msg

def send_msg(self, msg):
        to_addrs = [_.strip() for _ in msg['To'].split(',')]
        self._mail_helper.sendmail(msg['From'], to_addrs, msg, encoding_name=self._admin_settings.NOTIFY_CHARSET_EMAIL)

def send_notification(self, templ_data: dict, text_templ_name: str, html_templ_name: str = None):
        try:
            msg = self.generate_msg(templ_data, text_templ_name, html_templ_name)
            self.send_msg(msg)
        except StatsNotifierTemplateError as e:
            self.log.warning(str(e))

def _has_fault(self, column_name, faults):
        return any(user[column_name] > 0 for user in faults)

def _generate_table_data(self, users_data, notify_types_options):
        # type: (List[Dict], NotifyFaultsOptions) -> Tuple[Optional[str], Optional[str]]
        """Generate summary table with info about users"""
        table_columns = [('Username', 'LOGIN'), ('Domain', 'DOMAIN'), ('Name', 'FROMNAME')]
        additional_columns = itertools.compress(
            [
                [('CPU Limit, %', 'lCPU'), ('CPU Faults', 'CPUf')],
                [('VMem Limit, KB', 'lVMem'), ('VMem Faults', 'VMemF')],
                [('PMem Limit, KB', 'lPMem'), ('PMem Faults', 'PMemF')],
                [('EP Limit', 'lEP'), ('EP Faults', 'EPf')],
                [('NPROC Limit', 'lNproc'), ('NPROC Faults', 'NprocF')],
                [('IO Limit, KB/s', 'lIO'), ('IO Faults', 'IOf')],
            ],
            [
                notify_types_options.NOTIFY_CPU and self._has_fault('CPUf', users_data),
                notify_types_options.NOTIFY_MEMORY and self._has_fault('VMemF', users_data),  # deprecated
                notify_types_options.NOTIFY_MEMORY and self._has_fault('PMemF', users_data),
                notify_types_options.NOTIFY_EP and self._has_fault('EPf', users_data),
                notify_types_options.NOTIFY_NPROC and self._has_fault('NprocF', users_data),
                notify_types_options.NOTIFY_IO and self._has_fault('IOf', users_data),
            ],
        )
        table_columns.extend(sum(additional_columns, []))
        if self.lve_version > 6:
            if notify_types_options.NOTIFY_IOPS and self._has_fault('IOPSf', users_data):
                table_columns.extend([('IOPS Limit', 'lIOPS'), ('IOPS Faults', 'IOPSf')])
        columns = [header for header, _ in table_columns]

if len(users_data) == 0:
            return None, None

# Generates admin/reseller table from users_data and table_columns
        def gen_table_body():
            table_b = []
            for data in users_data:
                table_line = []
                for _, user_data_key in table_columns:
                    cell = str(data.get(user_data_key, '---'))
                    table_line.append(cell)
                table_b.append(table_line)
            return table_b

table = PrettyTable(columns)
        table.horizontal_char = '='
        table.junction_char = "="
        list(map(table.add_row, gen_table_body()))
        s_table = table.get_string()
        s_html_table = table.get_html_string(format=True, border=True, hrules=ALL, vrules=ALL)
        return s_table, s_html_table

def _prepare_template_data(self, user_data):
        # type: (Dict) -> Dict
        """
        Extend keys in new mode register ('aCPU' => 'acpu'),
        correct 'aVMem', 'aPMem', 'lVMem', 'lPMem'
        for backward compatibility with old templates
        """
        templ_data_dict = merge_dicts(user_data, {k.lower(): v for k, v in user_data.items()})

# old templates used camelCase-like variables
        # and there, info about memory must be in bytes
        templ_data_dict.update(
            {key: var * 1024 for key, var in templ_data_dict.items() if key in ('aVMem', 'aPMem', 'lVMem', 'lPMem')}
        )
        return templ_data_dict

def _notify_users(self, users_data):
        """
        Send email to each user in 'users_data',
        with given template path in 'templ_name'
        :type users_data: collections.Iterable[dict]
        :return: Nothing
        """
        for templ_data in users_data:
            templ_data['user_type'] = 'customer'
            if not templ_data.get('TOMAIL'):
                logging.debug('User %s has not set email, skip notification')
                continue

user_template_data = self._prepare_template_data(templ_data)
            self.send_notification(
                templ_data=user_template_data, text_templ_name=USER_TEMPL, html_templ_name=USER_TEMPL_HTML
            )

def _check_admin(self):
        if not (self._admin_settings.NOTIFY_ADMIN and any(self._admin_settings.NOTIFY_FAULTS_TYPES)):
            return
        if not self._notifications.admin_need_notification(self._admin_settings.NOTIFY_OPTIONS_SELF.NOTIFY_INTERVAL):
            return

self._notifications.mark_admin_notified()

period = self._admin_settings.NOTIFY_OPTIONS_SELF.NOTIFY_INTERVAL
        users_fault_data = self.get_users_fault(
            period=period,
            notify_min_faults=self._admin_settings.NOTIFY_OPTIONS_SELF.NOTIFY_MIN_FAULTS,
            notify_faults_types=self._admin_settings.NOTIFY_FAULTS_TYPES,
            uids=list(self._proc_lve.lve_id_list(0)),
        )

# TODO: should we show admin info about reseller's end users?
        users_data = self.get_users_data(fault_users_data=users_fault_data)
        if not users_data:
            return
        s_text_table, s_html_table = self._generate_table_data(users_data, self._admin_settings.NOTIFY_FAULTS_TYPES)
        # do nothing, if no table generated
        if not s_text_table:
            self.log.debug("During admin check, no users faults found. Skipping...")
            return

admin_template_data = {
            'STATS': s_text_table,
            'STATS_HTML': s_html_table,
            'FROMMAIL': self._admin_settings.NOTIFY_FROM_EMAIL,
            'LOCALE': self.get_locales(get_admin_locale()),
            'TOMAIL': self._detect_admin_email(),
            'PERIOD': period,
            'TONAME': 'Administrator',
            'user_type': 'admin',
            'HOSTNAME': self.hostname,
        }
        self.send_notification(
            templ_data=admin_template_data, text_templ_name=ADMIN_TEMPL, html_templ_name=ADMIN_TEMPL_HTML
        )
        return True

def get_panel_reseller_data(self, reseller_login):
        try:
            panel_user_data = cpapi.cpinfo(reseller_login, keyls=('mail', 'locale'), search_sys_users=False)[0]
        except (
            IOError,
            IndexError,
            cpapi.cpapiexceptions.NotSupported,
        ):
            return {}
        return {
            'TOMAIL': panel_user_data[0],
            'LOCALE': self.get_locales(panel_user_data[1] or 'en'),
            'RESELLER_USERNAME': reseller_login,
        }

def prepare_resellers_data(self, users_data):
        resellers_data = {}
        for user_data in users_data:
            reseller_login = user_data.get('RESELLER')
            if not reseller_login or reseller_login not in self.resellers:
                continue

if reseller_login not in resellers_data:
                reseller_data = self.get_panel_reseller_data(reseller_login)
                if not reseller_data.get('TOMAIL'):
                    continue

resellers_data[reseller_login] = merge_dicts(
                    {'USERS': [user_data['LOGIN']], 'PERIOD': user_data['PERIOD']},
                    reseller_data,
                )
            else:
                resellers_data[reseller_login]['USERS'].append(user_data['LOGIN'])
        result = []
        # Cycle by resellers
        for reseller_login, data in resellers_data.items():
            data['LOGIN'] = reseller_login
            reseller_settings = self.get_reseller_settings(reseller_login) or self._default_reseller_settings
            s_text_table, s_html_table = self._generate_table_data(
                [u for u in users_data if u['LOGIN'] in data['USERS']], reseller_settings.NOTIFY_FAULTS_TYPES
            )
            if not s_text_table:
                continue
            data['STATS'] = s_text_table
            data['STATS_HTML'] = s_html_table
            data['HOSTNAME'] = self.hostname
            result.append(data)
        return result

def _prepare_resellers_summary_data(self, resellers_data):
        """
        With enabled second-level of resellers's limits
        we have information about reseller's faults;
        Here we prepare information about such resellers;
        :type resellers_data: collections.Iterable[dict]
        :return: dict
        """
        for reseller_data in resellers_data:
            # TODO: looks like never happens
            reseller_login = reseller_data.get('LOGIN')
            if not reseller_login:
                continue

panel_data = self.get_panel_reseller_data(reseller_login)
            if not panel_data.get('TOMAIL'):
                continue

yield merge_dicts({'HOSTNAME': self.hostname}, reseller_data, panel_data)

def _load_locales_data(self, templates_dir: str) -> Dict:
        """
        Load locales data from specified directory (file /usr/share/lve/emails/<locale_name>/locale_defines.json)
        :param templates_dir: Directory name to search json file
        :return: Dictionary loaded from JSON file
        """
        # Try to get locale defines
        locale_defines_file = os.path.join(templates_dir, self.LOCALE_DEFINES_FILE)
        try:
            with open(locale_defines_file, encoding='utf-8') as json_file:
                return json.load(json_file)
        except Exception as e:
            # Can't read /usr/share/lve/emails/<locale_name>/locale_defines.json file
            self.log.warning("Can't read/parse email localization file %s: %s", locale_defines_file, str(e))
        return {}

@staticmethod
    def add_default_data(data_list, key, val):
        for data in data_list:
            data[key] = data.get(key) or val
            yield data

def get_admin_settings(self):
        """
        Read admin settings config (using shared code in
        lve-utils) and map it into our namedtuple structure
        :rtype: AdminSettings
        """
        raw_data = get_admin_notification()

settings = AdminSettings(
            NOTIFY_ADMIN=notification_data['notifyAdmin'],
            NOTIFY_CUSTOMERS_ON_FAULTS=notification_data['notifyCustomers'],
            NOTIFY_RESELLER_ON_CUSTOMERS_FAULTS=notification_data['notifyResellers'],
            NOTIFY_RESELLER_CUSTOMERS=notification_data['notifyResellerCustomers'],
            NOTIFY_FAULTS_TYPES=NotifyFaultsOptions(
                NOTIFY_CPU=faults_to_include['cpu'],
                NOTIFY_IO=faults_to_include['io'],
                NOTIFY_IOPS=faults_to_include['iops'],
                NOTIFY_MEMORY=faults_to_include['mem'],
                NOTIFY_EP=faults_to_include['concurrentConnections'],
                NOTIFY_NPROC=faults_to_include['nproc'],
            ),
            NOTIFY_OPTIONS_SELF=NotifySettings(
                NOTIFY_MIN_FAULTS=min_to_notify['admin'], NOTIFY_INTERVAL=notify_interval_admin
            ),
            NOTIFY_OPTIONS_CUSTOMER=NotifySettings(
                NOTIFY_MIN_FAULTS=min_to_notify['user'], NOTIFY_INTERVAL=notify_interval_user
            ),
            NOTIFY_FROM_EMAIL=email_settings.get('notifyFromEmail') or DEFAULT_ADMIN_MAIL,
            REPORT_ADMIN_EMAIL=email_settings.get('reportAdminMail') or '',
            NOTIFY_SUBJECT=email_settings.get('notifySubject') or '',
            NOTIFY_CHARSET_EMAIL=email_settings.get('notifyCharset') or 'us-ascii',
        )
        return settings

def get_default_reseller_settings(self):
        # type: () -> ResellerSettings
        return ResellerSettings(
            NOTIFY_RESELLER_ON_CUSTOMERS_FAULTS=self._admin_settings.NOTIFY_RESELLER_ON_CUSTOMERS_FAULTS,
            NOTIFY_CUSTOMERS_ON_FAULTS=self._admin_settings.NOTIFY_RESELLER_CUSTOMERS,
            NOTIFY_RESELLER_ON_TOTAL_FAULTS=self._admin_settings.NOTIFY_RESELLER_ON_CUSTOMERS_FAULTS,
            NOTIFY_FAULTS_TYPES=self._admin_settings.NOTIFY_FAULTS_TYPES,
            NOTIFY_OPTIONS_SELF=self._admin_settings.NOTIFY_OPTIONS_SELF,
            NOTIFY_OPTIONS_CUSTOMER=self._admin_settings.NOTIFY_OPTIONS_CUSTOMER,
        )

def get_reseller_settings(self, reseller, use_cache=True):
        # type: (str, Optional[bool]) -> Optional[ResellerSettings]
        if use_cache and reseller in self._reseller_settings_cache:
            return self._reseller_settings_cache[reseller]

raw_data = get_notification(reseller)
        if not raw_data or 'faultsNotification' not in raw_data:
            if use_cache:
                self._reseller_settings_cache[reseller] = None
            return

notification_data = raw_data['faultsNotification']
        faults_to_include = notification_data['faultsToInclude']
        min_to_notify = notification_data['minimumNumberOfFaultsToNotify']
        periods = notification_data['notify']
        try:
            notify_interval_reseller = dateutil.time_dict_to_seconds(periods['reseller'])
            notify_interval_customer = dateutil.time_dict_to_seconds(periods['customer'])
        except (ValueError, TypeError) as e:
            notify_interval_customer = self.DEFAULT_PERIOD
            notify_interval_reseller = self.DEFAULT_PERIOD
            self.log.warning("Can't set interval to reseller %s. Period value is incorrect: %s", reseller, str(e))
        res = ResellerSettings(
            # Admin's global setting analogue is NOTIFY_RESELLER
            NOTIFY_RESELLER_ON_CUSTOMERS_FAULTS=notification_data['notifyResellerOnCustomers'],
            # Admin's global setting analogue is NOTIFY_CUSTOMER
            NOTIFY_CUSTOMERS_ON_FAULTS=notification_data['notifyCustomers'],
            NOTIFY_RESELLER_ON_TOTAL_FAULTS=notification_data['notifyReseller'],
            NOTIFY_FAULTS_TYPES=NotifyFaultsOptions(
                NOTIFY_CPU=faults_to_include['cpu'],
                NOTIFY_IO=faults_to_include['io'],
                NOTIFY_IOPS=faults_to_include['iops'],
                NOTIFY_MEMORY=faults_to_include['mem'],
                NOTIFY_EP=faults_to_include['concurrentConnections'],
                NOTIFY_NPROC=faults_to_include['nproc'],
            ),
            NOTIFY_OPTIONS_SELF=NotifySettings(
                NOTIFY_MIN_FAULTS=min_to_notify['reseller'], NOTIFY_INTERVAL=notify_interval_reseller
            ),
            NOTIFY_OPTIONS_CUSTOMER=NotifySettings(
                NOTIFY_MIN_FAULTS=min_to_notify['customer'], NOTIFY_INTERVAL=notify_interval_customer
            ),
        )
        if use_cache:
            self._reseller_settings_cache[reseller] = res
        return res

def _process_resellers_mails(self, users_data_reseller):
        """
        Decide and send mails to resellers as resellers (doesn't include
        notification to reseller about it's personal account as a customer)
        :return: Nothing
        """
        resellers_data = self.prepare_resellers_data(users_data_reseller)
        if not resellers_data:
            return
        resellers_data = self.add_default_data(resellers_data, 'TONAME', 'Reseller')
        for reseller_info in resellers_data:
            reseller_info['user_type'] = 'reseller'
            if not reseller_info.get('TOMAIL'):
                continue

self.send_notification(
                templ_data=reseller_info, text_templ_name=RESELLER_TEMPL, html_templ_name=RESELLER_TEMPL_HTML
            )

def _process_resellers_summary_info_mails(self, resellers_data):
        # type: (Iterable[Dict]) -> None
        """
        When second level of reseller limits is enabled
        we collect summary info about reseller;
        When total load makes fault, we notify reseller about it;
        """
        resellers_faults_data = self._prepare_resellers_summary_data(resellers_data)
        resellers_faults_data = self.add_default_data(resellers_faults_data, 'TONAME', 'Reseller')
        for reseller_info in resellers_faults_data:
            reseller_info['user_type'] = 'reseller'
            self._notify_reseller_summary_faults(reseller_info)

def _notify_reseller_summary_faults(self, reseller_info):
        # type: (Dict) -> None
        """Prepare data for reseller_faults_notify template"""
        reseller_info = self._prepare_template_data(reseller_info)
        self.send_notification(
            templ_data=reseller_info, text_templ_name=RESELLER_FAULTS_TEMPL, html_templ_name=RESELLER_FAULTS_TEMPL_HTML
        )

def _process_users_mails(self, users_data):
        """
        Decide and send mails to customers(including resellers personal account
        notification as a customer)
        :return: Nothing
        """
        for user_info in users_data[:]:
            account_owner = user_info['RESELLER']
            user_notification_enabled = user_should_be_notified(user_info['LOGIN'])
            # reseller's will override
            do_notify = self._admin_settings.NOTIFY_CUSTOMERS_ON_FAULTS and user_notification_enabled
            # is user belongs to some reseller?
            if account_owner in self.resellers:
                reseller_settings = self.get_reseller_settings(account_owner) or self._default_reseller_settings
                do_notify = reseller_settings.NOTIFY_CUSTOMERS_ON_FAULTS and user_notification_enabled
            if not do_notify:
                # Exclude only in users' data copy to prevent affecting
                # resellers notifications(summary tables)
                users_data.remove(user_info)
                continue

self._notify_users(self.add_default_data(users_data, 'TONAME', 'Customer'))

def _iter_customers_faults_data(self):
        # type: () -> Iterator[Dict]
        """
        Find all customers that might cause faults
        from /proc/lve/list, get additional data from
        control panel and return it
        """
        # iter over resellers and prepare data
        for (notify_settings, notify_faults_types), resellers in self._get_customers_options_grouped():
            # mark all resellers as those, whose users were notified
            notified_resellers = [reseller_id for reseller_id, _ in resellers]
            self._notifications.mark_users_notified(notified_resellers)

# list users that may cause faults during period
            users_to_check = sum(
                (list(self._proc_lve.lve_id_list(reseller_id)) for reseller_id in notified_resellers), []
            )

yield self.__get_customers_faults_data(users_to_check, notify_faults_types, notify_settings)

def __get_customers_faults_data(self, users_to_check, notify_faults_types, notify_settings):
        # type: (list[int], NotifyFaultsOptions, NotifySettings) -> list[dict]
        # search statistics in database for given users
        users_fault_data = self.get_users_fault(
            period=notify_settings.NOTIFY_INTERVAL,
            notify_min_faults=notify_settings.NOTIFY_MIN_FAULTS,
            notify_faults_types=notify_faults_types,
            uids=users_to_check,
        )
        # Receive users info from cpapi
        # TODO rewrite with generators because modify or copy users_data[:]
        # both may lead to problems
        users_data = self.get_users_data(fault_users_data=users_fault_data)
        return users_data

def _check_users(self):
        for users_data in self._iter_customers_faults_data():
            self._process_users_mails(users_data)

def _iter_resellers_faults_data(self):
        # type: () -> Tuple[List[Dict], List[int]]
        """
        Find all resellers that might cause faults
        from /proc/lve/resellers, get additional data from
        control panel and return it
        """
        # get all resellers that may be notified
        for (notify_settings, notify_faults_types), resellers in self._get_resellers_options_grouped():
            resellers_uids = [reseller_id for reseller_id, _ in resellers]
            # in our database resellers have serialized id's
            resellers_to_check = [serialize_lve_id(LIMIT_LVP_ID, reseller_id) for reseller_id in resellers_uids]

# get data from database for those resellers that might cause faults
            faults_data = self.get_users_fault(
                period=notify_settings.NOTIFY_INTERVAL,
                notify_min_faults=notify_settings.NOTIFY_MIN_FAULTS,
                notify_faults_types=notify_faults_types,
                uids=resellers_to_check,
            )

# receive resellers info from cpapi
            resellers_data = self._get_resellers_data(faults_data=faults_data)
            yield resellers_data, resellers_uids

def _iter_reseller_users_list_faults_data(self):
        # type: () -> Tuple[List[Dict], List[int]]
        for (notify_settings, notify_faults_types), resellers in self._get_resellers_customers_faults_options_grouped():
            # mark all resellers as those, whose users were notified
            notified_resellers = [reseller_id for reseller_id, _ in resellers]

# list of users that may cause faults during period
            users_to_check = []
            for reseller_id in notified_resellers:
                users_to_check.extend(self._proc_lve.lve_id_list(reseller_id))

customers_faults = self.__get_customers_faults_data(users_to_check, notify_faults_types, notify_settings)
            yield customers_faults, notified_resellers

def _check_resellers(self):
        notified_resellers = set()

for resellers_data, reseller_ids in self._iter_resellers_faults_data():
            # send reseller his own total faults during PERIOD
            # works only with enabled second level of reseller limits
            self._process_resellers_summary_info_mails(resellers_data)
            notified_resellers.update(reseller_ids)

for users_data, reseller_ids in self._iter_reseller_users_list_faults_data():
            # send reseller table with his users faults during PERIOD
            # works with and without second level of reseller limits
            self._process_resellers_mails(users_data)
            notified_resellers.update(reseller_ids)

self._notifications.mark_resellers_notified(notified_resellers)

def execute(self, lve_data):
        # type: (Dict) -> None

# Reset this cache each time because resellers should have ability to
        # change their notification preferences without restarting
        # StatsNotifier plugin
        self._reseller_settings_cache = {}

self._name_map.link_xml_node(use_cache=False)

self._check_users()  # check if any users need to be notified
        self._check_resellers()  # check if some resellers must be notified on their faults
        self._check_admin()  # check if we must notify admin himself
        self._notifications.save_to_persistent_storage()  # save timestamps to file

def get_stats_notifier_parameters(user):
    """
    Gets parameter for user
    """
    default_reseller = 'root'

reseller = cpinfo(user, keyls=('reseller',))
    if reseller:
        default_reseller = reseller[0][0]

stat_notifier = StatsNotifier()
    if default_reseller not in admins():
        settings = (
            stat_notifier.get_reseller_settings(default_reseller) or stat_notifier.get_default_reseller_settings()
        )
    else:
        settings = stat_notifier.get_admin_settings()
    return settings.NOTIFY_CUSTOMERS_ON_FAULTS

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