#!/usr/bin/python3

# MIT License

# Copyright (c) 2024 Thomas Williams - https://git.server.wales/thomas

# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:

# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

import config
import psutil
import os
import time
import log
import requests
import threading
import signal
import socket
from functools import partial
from concurrent.futures import ThreadPoolExecutor, as_completed
from bs4 import BeautifulSoup
from log import logsManager 
from datetime import datetime

if config.loggingMode == 'rabbitmq':

    import rabbitmq
    rabbitmq = rabbitmq.rabbitMQClient(config.rabbitmqca,config.rabbitmqcacert,config.rabbitmqcakey,config.rabbitmqHost,config.rabbitmqPort,config.rabbitmqRoutingKey)

stop_event = threading.Event()
nonPOSIXCPULoads = []
lock = threading.Lock()

def signal_handler(sig, frame):
    print('SIGINT/SIGTERM aknowledged. Stopping script gracefully, please wait...')
    stop_event.set()

def loadUrl(url):
    
    headers = { 'User-Agent': 'Monutil monitor' }

    response = requests.get(url, timeout=config.urlTimeout, headers=headers)
    return response

def prepareUrl(src, baseUrl):

    if not src.startswith("http://") and not src.startswith("https://"):
        return baseUrl.rstrip("/") + "/" + src.lstrip("/")
    return src

def nonPOSIXCPULoad(stop_event):
    
    global nonPOSIXCPULoads
    nonPOSIXCPULoad = 0

    while not stop_event.is_set():

        nonPOSIXCPULoad = psutil.cpu_percent(interval=1)
        
        with lock:
            
            nonPOSIXCPULoads.append(nonPOSIXCPULoad)
            
            if len(nonPOSIXCPULoads) > 60:
                nonPOSIXCPULoads.pop(0)
        
        time.sleep(0.1)

def getNonPOSIXCPUAverage():

    global nonPOSIXCPULoads
    
    with lock:
        if sum(nonPOSIXCPULoads) > 0:
            avgLoad = sum(nonPOSIXCPULoads) / len(nonPOSIXCPULoads)
        else:
            avgLoad = 0

    return avgLoad

def monitorHost(stop_event):

    nonPOSIXCPUStarted = False

    while not (stop_event.is_set()) and (config.hostMonitoringPeriod > 0):

        while not (stop_event.is_set()) and (time.strftime("%H:%M:%S") >= config.hostMonitorStartTime and time.strftime("%H:%M:%S") <= config.hostMonitorEndTime):
        
            if os.name != 'posix' or config.forceNonPOSIXCPU:
            
                if not nonPOSIXCPUStarted:
                
                    nonPOSIXCPUMonitor = threading.Thread(target=nonPOSIXCPULoad, args=(stop_event,))
                    nonPOSIXCPUMonitor.start()
                    nonPOSIXCPUStarted = True

                loadavg = round(getNonPOSIXCPUAverage(), 2)

            else:

                load1, load5, load15 = psutil.getloadavg() # this takes time to warm up if not running script on *nix 
                loadavg = round((load1/os.cpu_count()) * 100, 2)
        
            memory = psutil.virtual_memory().percent
            
            logHostLog(socket.gethostname(), datetime.now(), loadavg, memory)

            print("CPU %: " + str(loadavg))
            print("Memory %: " + str(memory))
            print() # new line

            time.sleep(config.hostMonitoringPeriod)

        time.sleep(1)

def monitorUrls(stop_event):

    while not (stop_event.is_set()) and (config.urlMonitoringPeriod > 0):

        while not (stop_event.is_set()) and (time.strftime("%H:%M:%S") >= config.urlMonitorStartTime and time.strftime("%H:%M:%S") <= config.urlMonitorEndTime):

            for url in config.urls:

                baseUrl = url
                urlFail = False

                startTime = time.time()
                
                request = loadUrl(url)

                if request.status_code == 200:

                    html = BeautifulSoup(request.content, 'html.parser')
                    imageUrls = [img['src'] for img in html.find_all('img')]

                    with ThreadPoolExecutor(max_workers=config.maxWorkers) as executor:

                        responses = [executor.submit(loadUrl, prepareUrl(url, baseUrl)) for url in imageUrls]
                        responses = [future.result() for future in as_completed(responses)]

                        for response in responses:

                            if not response.status_code == 200:

                                urlFail = True
                            
                        endTime = time.time()
                        timeDiff = endTime - startTime
                                
                        print(baseUrl + " response time: " + str(timeDiff))
                        print() # new line
                        
                        logURLLog(socket.gethostname(), datetime.now(), baseUrl, timeDiff)

                else:

                    urlFail = True

            time.sleep(config.urlMonitoringPeriod)

        time.sleep(1)

def logHostLog(hostname, logTime, cpu, memory):

    if not config.loggingMode == 'none' and not config.loggingMode == 'rabbitmq':
        
        manager = logsManager(config.sqlServer, config.sqlDatabase, config.sqlUsername, config.sqlPassword)
        manager.insertHostLog(hostname, socket.gethostbyname(socket.gethostname()), logTime, cpu, memory)

    if config.loggingMode == 'rabbitmq':

        rabbitmq.publish(hostname + '|' + socket.gethostbyname(socket.gethostname()) + '|' + str(logTime) + '|' + 'cpumem' + '|' + str(cpu) + '|' + str(memory))

def logURLLog(hostname, logTime, url, responseTime):

    if not config.loggingMode == 'none' and not config.loggingMode == 'rabbitmq':
            
        manager = logsManager(config.sqlServer, config.sqlDatabase, config.sqlUsername, config.sqlPassword)
        manager.insertURLLog(hostname, socket.gethostbyname(socket.gethostname()), logTime, url, responseTime)

    if config.loggingMode == 'rabbitmq':

        rabbitmq.publish(hostname + '|' + socket.gethostbyname(socket.gethostname()) + '|' + str(logTime) + '|' + 'url' + '|' + url + '|' + str(responseTime))

def main():

    signal.signal(signal.SIGTERM, signal_handler)
    signal.signal(signal.SIGINT, signal_handler)

    hostMonitorThread = threading.Thread(target=monitorHost, args=(stop_event,))
    urlMonitorThread = threading.Thread(target=monitorUrls, args=(stop_event,))
    
    hostMonitorThread.start() 
    urlMonitorThread.start()

    hostMonitorThread.join()
    urlMonitorThread.join()

if __name__ == "__main__":
    main()