utils.js

const debug = {
    mqtt: require('debug')('ring-mqtt'),
    attr: require('debug')('ring-attr'),
    disc: require('debug')('ring-disc')
}
const colors = require('colors/safe')
const dns = require('dns')
const os = require('os')
const { promisify } = require('util')

class Utils
{
    // Sleep function (seconds)
    sleep(sec) {
        return this.msleep(sec*1000)
    }

    // Sleep function (milliseconds)
    msleep(msec) {
        return new Promise(res => setTimeout(res, msec))
    }

    // Return ISO time from epoch without milliseconds
    getISOTime(epoch) {
        return new Date(epoch).toISOString().slice(0,-5)+"Z"
    }

    async getHostFqdn() {
        const pLookupService = promisify(dns.lookupService)
        try {
            return (await pLookupService(await this.getHostIp(), 0)).hostname
        } catch {
            console.log('Failed to resolve FQDN, using os.hostname() instead')
            return os.hostname()
        }
    }

    async getHostIp() {
        const pLookup = promisify(dns.lookup)
        try {
            return (await pLookup(os.hostname())).address
        } catch {
            console.log('Failed to resolve hostname IP address, returning localhost instead')
            return 'localhost'
        }
    }

    log(message, level, category) {
        category = category ? category : 'mqtt'
        switch (level) {
            case 'info':
                debug[category](colors.green(`[${this.deviceData.name}] `)+message)
                break;
            case 'warn':
                debug[category](colors.brightYellow(`[${this.deviceData.name}] `)+message)
                break;
            case 'error':
                debug[category](colors.brightRed(`[${this.deviceData.name}] `)+message)
            default:
                debug[category](message)
        }
    }
}

module.exports = new Utils()