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node-red-nodes/io/mdns/mdns.js

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/**
* Copyright 2015 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
**/
module.exports = function(RED) {
"use strict";
function MdnsNode(n) {
var mdns = require('mdns');
if (process.platform === "linux") {
RED.log.info("You may ignore the warning about Bonjour compatability.");
}
RED.nodes.createNode(this, n);
this.topic = n.topic || "";
this.service = n.service;
var sequence = [
mdns.rst.DNSServiceResolve(),
mdns.rst.getaddrinfo({families: [4] })
];
var browser = mdns.createBrowser(this.service,{resolverSequence: sequence});
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var node = this;
browser.on('serviceUp', function(service) {
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if (RED.settings.verbose) { node.log("here : " + service.name); }
service.state = true;
var msg = {topic:node.topic, payload:service};
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node.send(msg);
});
browser.on('serviceDown', function(service) {
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if (RED.settings.verbose) { node.log("away : " + service.name); }
service.state = false;
var msg = {topic:node.topic, payload:service};
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node.send(msg);
});
browser.start();
node.on("close", function() {
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if (browser) { browser.stop(); }
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});
}
RED.nodes.registerType("discovery", MdnsNode);
function MdnsAnnNode(n) {
var mdns = require('mdns');
var os = require("os");
if (process.platform === "linux") {
RED.log.info("You may ignore the warning about Bonjour compatability.");
}
RED.nodes.createNode(this, n);
this.service = n.service || "";
this.port = n.port;
this.name = n.name;
this.txt = n.txt;
if (this.txt && (this.txt !== '')) {
try { this.txt = JSON.parse('{'+this.txt+'}'); }
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catch (e) { delete this.txt; }
}
var node = this;
this.on("input", function(msg) {
if ((msg.payload === 0) || (msg.payload === "0")) {
node.ad.stop();
}
else {
var service = node.service || msg.service;
var port = Number(node.port || msg.port);
var options = {};
if (node.name || msg.name) {
options.name = (node.name || msg.name).replace(/\%h/g, os.hostname());
}
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if (node.txt || msg.txtRecord) { options.txtRecord = node.txt || msg.txtRecord }
node.ad = mdns.createAdvertisement(service, port, options);
node.ad.start();
}
});
this.on("error", function(e) {
node.error(e);
});
this.on("close", function() {
if (node.ad) { node.ad.stop(); }
});
}
RED.nodes.registerType("announce", MdnsAnnNode);
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}