'use strict'
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var os = require('os')
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var util = require('util')
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var EventEmitter = require('events').EventEmitter
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var serviceName = require('multicast-dns-service-types')
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var txt = require('dns-txt')()
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var TLD = '.local'
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module.exports = Service
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util.inherits(Service, EventEmitter)
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function Service (opts) {
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if (!opts.name) throw new Error('Required name not given')
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if (!opts.type) throw new Error('Required type not given')
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if (!opts.port) throw new Error('Required port not given')
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this.name = opts.name
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this.protocol = opts.protocol || 'tcp'
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this.type = serviceName.stringify(opts.type, this.protocol)
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this.host = opts.host || os.hostname()
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this.port = opts.port
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this.fqdn = this.name + '.' + this.type + TLD
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this.subtypes = opts.subtypes || null
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this.txt = opts.txt || null
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this.published = false
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this._activated = false // indicates intent - true: starting/started, false: stopping/stopped
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}
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Service.prototype._records = function () {
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var records = [rr_ptr(this), rr_srv(this), rr_txt(this)]
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var self = this
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var interfaces = os.networkInterfaces()
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Object.keys(interfaces).forEach(function (name) {
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interfaces[name].forEach(function (addr) {
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if (addr.internal) return
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if (addr.family === 'IPv4') {
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records.push(rr_a(self, addr.address))
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} else {
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records.push(rr_aaaa(self, addr.address))
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}
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})
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})
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return records
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}
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function rr_ptr (service) {
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return {
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name: service.type + TLD,
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type: 'PTR',
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ttl: 28800,
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data: service.fqdn
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}
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}
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function rr_srv (service) {
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return {
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name: service.fqdn,
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type: 'SRV',
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ttl: 120,
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data: {
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port: service.port,
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target: service.host
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}
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}
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}
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function rr_txt (service) {
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return {
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name: service.fqdn,
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type: 'TXT',
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ttl: 4500,
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data: txt.encode(service.txt)
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}
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}
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function rr_a (service, ip) {
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return {
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name: service.host,
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type: 'A',
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ttl: 120,
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data: ip
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}
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}
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function rr_aaaa (service, ip) {
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return {
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name: service.host,
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type: 'AAAA',
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ttl: 120,
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data: ip
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}
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}
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