Monitor network connectivity to the internet via python

monitor.py

import os
import socket
import datetime
import time


FILE = os.path.join(os.getcwd(), "networkinfo.log")
DBG = False


def isConnected():
    osErr = ""
    try:
        s = socket.create_connection(("1.1.1.1", 443), timeout=1)
        if s is not None:
            s.close()
        print(
            "[" + str(datetime.datetime.now()).split(".")[0] + "] Connected"
        ) if DBG else None
        return True
    except OSError:
        osErr = "OSError"
        pass

    print(
        osErr + " [" + str(datetime.datetime.now()).split(".")[0] + "] DISCONNECTED!!!"
    ) if DBG else None

    return False


def ping():
    return isConnected()


def calculate_time(start, stop):

    # calculating unavailability
    # time and converting it in seconds
    difference = stop - start
    seconds = float(str(difference.total_seconds()))
    return str(datetime.timedelta(seconds=seconds)).split(".")[0]


def first_check():
    # to check if the system was already
    # connected to an internet connection

    if ping():
        # if ping returns true
        live = "\nCONNECTION ACQUIRED\n"
        print(live)
        connection_acquired_time = datetime.datetime.now()
        acquiring_message = (
            "connection acquired at: " + str(connection_acquired_time).split(".")[0]
        )
        print(acquiring_message)

        with open(FILE, "a") as file:

            # writes into the log file
            file.write(live)
            file.write(acquiring_message)

        return True

    else:
        # if ping returns false
        not_live = "\nCONNECTION NOT ACQUIRED\n"
        print(not_live)

        with open(FILE, "a") as file:

            # writes into the log file
            file.write(not_live)
        return False


def main():

    # main function to call functions
    monitor_start_time = datetime.datetime.now()
    monitoring_date_time = (
        "monitoring started at: " + str(monitor_start_time).split(".")[0]
    )

    if first_check():
        # if true
        print(monitoring_date_time)
        print("")
        # monitoring will only start when
        # the connection will be acquired

    else:
        # if false
        while True:

            # infinite loop to see if the connection is acquired
            if not ping():

                # if connection not acquired
                time.sleep(1)
            else:

                # if connection is acquired
                first_check()
                print(monitoring_date_time)
                break

    with open(FILE, "a") as file:

        # write into the file as a into networkinfo.log,
        # "a" - append: opens file for appending,
        # creates the file if it does not exist???
        file.write("\n")
        file.write(monitoring_date_time + "\n")

    while True:

        # infinite loop, as we are monitoring
        # the network connection till the machine runs
        if ping():

            # if true: the loop will execute after every 5 seconds
            time.sleep(5)

        else:
            # if false: fail message will be displayed
            down_time = datetime.datetime.now()
            fail_msg = "- disconnected at: " + str(down_time).split(".")[0]
            print(fail_msg)

            with open(FILE, "a") as file:
                # writes into the log file
                file.write(fail_msg + "\n")

            while not ping():

                # infinite loop, will run till ping() return true
                time.sleep(1)

            up_time = datetime.datetime.now()

            # after loop breaks, connection restored
            uptime_message = "+ connected again: " + str(up_time).split(".")[0]

            down_time = calculate_time(down_time, up_time)
            unavailablity_time = "  connection was unavailable for: " + down_time

            print(uptime_message)
            print(unavailablity_time)

            with open(FILE, "a") as file:

                # log entry for connection restoration time,
                # and unavailability time
                file.write(uptime_message + "\n")
                file.write(unavailablity_time + "\n")


main()