maintenance-bot/modules/checkers/ip-changed.js

import getLogger from "../../libs/logger.js"
import settings  from "../../libs/settings.js"
import fs        from "fs"
import publicIp  from "public-ip"

if (!fs.existsSync("./ip.cache")) fs.writeFileSync("./ip.cache", "")

const log   = getLogger("IP Watcher", settings.checkers["ip-changed"].color)
const getIp = async () => await publicIp.v4({ onlyHttps: true })

const currentIp   = await getIp().replace(/\s/g, "")
const cachedOldIp = fs.readFileSync("./ip.cache").toString()
let   oldIp       = cachedOldIp ? cachedOldIp : currentIp

async function checkIp(sendMessage) {
    log("Checking for IP changes...")
    const nowIp = await getIp()
    if (nowIp !== oldIp) {
        sendMessage(`IP change detected! Old IP was '${oldIp}', new IP is '${nowIp}'.`)
        oldIp = nowIp
        fs.writeFileSync("./ip.cache", nowIp)
        return
    }

    log("No IP change detected!")
}

export async function start(sendMessage) {
    log("Starting up the IP watcher...")
    checkIp(sendMessage)
    setInterval(
        () => checkIp(sendMessage),
        (settings.checkers["ip-changed"].interval ?? 3600) * 1000
    )

    return
}