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#!/opt/cloudlinux/venv/bin/python3 -bb
# coding=utf-8
#
# Copyright © Cloud Linux GmbH & Cloud Linux Software, Inc 2010-2020 All Rights Reserved
#
# Licensed under CLOUD LINUX LICENSE AGREEMENT
# http://cloudlinux.com/docs/LICENCE.TXT
#

import contextlib
import logging
import fcntl
import os
import time

import requests
import subprocess
from clcommon import cpapi
from clcommon.utils import get_rhn_systemid_value
from wmt.common.url_parser import parse
from wmt.common.const import (
    CLICKHOUSE_WMT_ENDPOINT,
    UNKNOWN_RHN_ID,
    SERVICE_BIN,
    CHKCONFIG_BIN,
    SYSTEMCTL_BIN
)


# logic copied from get_domains script, that is used by go
def get_domains():
    domains = set()
    if cpapi.CP_NAME == cpapi.PLESK_NAME:
        users = [_cpinfo[0] for _cpinfo in cpapi.cpinfo(keyls=('cplogin',))]
    else:
        users = cpapi.cpusers()
    if not users:
        return domains

    try:
        suspended_users = cpapi.suspended_users_list()
    except Exception:
        logging.exception('Cannot obtain list of suspended users')
        suspended_users = []

    # dirty hack to reload domains in runtime
    # TODO: replace with more suitable solution
    if cpapi.CP_NAME == 'cPanel':
        cpapi.plugins.cpanel._user_to_domains_map_cpanel = dict()
    for user in users:
        if user in suspended_users:
            logging.warning('User: %s is will not be pinged, because account is suspended', user)
            continue
        for domain, _ in cpapi.userdomains(user):
            domains.add(parse(domain))
    return domains


def setup_logger(logger_name):
    app_logger = logging.getLogger(logger_name)
    app_logger.setLevel(logging.DEBUG)
    try:
        fh = logging.FileHandler('/var/log/cl_wmt.log')
    except IOError:
        pass
    else:
        fh.formatter = logging.Formatter('[%(levelname)s | %(asctime)s]: %(message)s')
        app_logger.addHandler(fh)
    return app_logger


@contextlib.contextmanager
def save_pid_and_lock(file: str, pid: str):
    mode = 'w+' if not os.path.exists(file) else 'r+'
    f = open(file, mode)
    try:
        fcntl.flock(f.fileno(), fcntl.LOCK_EX | fcntl.LOCK_NB)
    except OSError:
        raise OSError('Process %s already running!' % pid)
    try:
        f.write(pid)
        f.flush()
        os.fsync(f)
        yield
    finally:
        fcntl.flock(f.fileno(), fcntl.LOCK_UN)
        f.close()
        os.remove(file)


def intersect(d1, d2):
    result = {}
    for key in d1:
        if key in d2:
            result[key] = d1[key], d2[key]
    return result


def send_report(url, report):
    error = requests.RequestException('Error while sending report to ClickHouse')
    for i in range(5):
        try:
            response = requests.post(url, json=report, timeout=60)
            response.raise_for_status()
        except requests.RequestException as err:
            error = err
            time.sleep(4 ** i)
        else:
            break
    else:
        raise error


def send_report_to_clickhouse(report):
    systemd_id = get_rhn_systemid_value('system_id') or UNKNOWN_RHN_ID
    # ID-XXXXXXXX -> XXXXXXXX
    report['server_id'] = systemd_id.replace('ID-', '')
    summary = report.pop('summary_report')
    send_report(CLICKHOUSE_WMT_ENDPOINT, {**report, **summary})

def enable_wmt_daemon(daemon_name, is_cl6):
    """
    Enable cl_wmt_scanner service
    """
    if is_cl6:
        # CL6
        # Start wmt service
        subprocess.run('{} {} start >/dev/null 2>&1'.format(SERVICE_BIN, daemon_name),
                       shell=True, executable='/bin/bash', capture_output=True)
        subprocess.run('{} --add {} >/dev/null 2>&1'.format(CHKCONFIG_BIN, daemon_name),
                       shell=True, executable='/bin/bash', capture_output=True)
    else:
        # CL7, CL8
        subprocess.run('{} daemon-reload'.format(SYSTEMCTL_BIN),
                       shell=True, executable='/bin/bash', capture_output=True)
        # Start wmt daemon
        subprocess.run('{} enable {}'.format(SYSTEMCTL_BIN, daemon_name),
                       shell=True, executable='/bin/bash', capture_output=True)
        subprocess.run('{} start {}'.format(SYSTEMCTL_BIN, daemon_name),
                       shell=True, executable='/bin/bash', capture_output=True)


def disable_wmt_daemon(daemon_name, is_cl6):
    """
    Disable WMT daemon
    :return:
    """
    if is_cl6:
        # CL6
        subprocess.run('{} {} stop >/dev/null 2>&1'.format(SERVICE_BIN, daemon_name),
                       shell=True, executable='/bin/bash', capture_output=True)
        subprocess.run('{} --del {} >/dev/null 2>&1'.format(CHKCONFIG_BIN, daemon_name),
                       shell=True, executable='/bin/bash', capture_output=True)
    else:
        # CL7, CL8
        subprocess.run('{} kill {} >/dev/null 2>&1'.format(SYSTEMCTL_BIN, daemon_name),
                       shell=True, executable='/bin/bash', capture_output=True)
        subprocess.run('{} disable {} >/dev/null 2>&1'.format(SYSTEMCTL_BIN, daemon_name),
                       shell=True, executable='/bin/bash', capture_output=True)

def manage_crons(status=True):
    cron_tool = '/usr/share/web-monitoring-tool/cron_control.py'
    if status:
        command = [cron_tool, '-i']
    else:
        command = [cron_tool, '-d']
    subprocess.run(command, capture_output=True, text=True)