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

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2015-03-04 20:55:53 +01:00
/**
* 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 browser = mdns.createBrowser(this.service);
var node = this;
browser.on('serviceUp', function (service) {
if (RED.settings.verbose) { node.log("here : " + service.name); }
service.state = true;
var msg = {topic: node.topic, payload: service};
node.send(msg);
});
browser.on('serviceDown', function (service) {
if (RED.settings.verbose) { node.log("away : " + service.name); }
service.state = false;
var msg = {topic: node.topic, payload: service};
node.send(msg);
});
browser.start();
node.on("close", function () {
browser.stop();
});
}
RED.nodes.registerType("discovery", MdnsNode);
}