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node-red/nodes/io/32-multicast.js
2013-10-13 19:25:53 +01:00

121 lines
3.2 KiB
JavaScript

/**
* Copyright 2013 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.
**/
var RED = require("../../red/red");
var dgram = require('dgram');
// The Input Node
function MCastIn(n) {
RED.nodes.createNode(this,n);
this.warn("node type deprecated");
this.group = n.group;
this.port = n.port;
this.host = n.host || null;
this.base64 = n.base64;
this.iface = n.iface || null;
this.multicast = n.multicast;
var node = this;
var server = dgram.createSocket('udp4');
server.on("error", function (err) {
console.log("udp listener error:\n" + err.stack);
server.close();
});
server.on('message', function (message, remote) {
var msg;
if (node.base64) { msg = { payload:message.toString('base64'), fromip:remote.address+':'+remote.port }; }
else { msg = { payload:message, fromip:remote.address+':'+remote.port }; }
node.send(msg);
});
server.on('listening', function () {
var address = server.address();
node.log('udp listener at ' + address.address + ":" + address.port);
if (node.multicast) {
server.setBroadcast(true)
server.setMulticastTTL(128);
server.addMembership(node.group,node.iface);
node.log("udp multicast group "+node.group);
}
});
//server.bind(node.port,node.host);
server.bind(node.port,node.host);
this._close = function() {
server.close();
node.log('udp listener stopped');
}
}
MCastIn.prototype.close = function() {
this._close();
}
RED.nodes.registerType("multicast in",MCastIn);
// The Output Node
function MCastOut(n) {
RED.nodes.createNode(this,n);
this.warn("node type deprecated");
this.group = n.group;
this.port = n.port;
this.host = n.host || null;
this.base64 = n.base64;
this.iface = n.iface || null;
this.multicast = n.multicast;
var node = this;
var sock = dgram.createSocket('udp4'); // only use ipv4 for now
sock.bind(node.port); // have to bind before you can enable broadcast...
sock.setBroadcast(true); // turn on broadcast
sock.setMulticastTTL(128);
sock.addMembership(node.group,node.iface); // Add to the multicast group
node.log('udp multicaster ready on '+node.group+":"+node.port);
node.on("input", function(msg) {
if (msg.payload != null) {
console.log("MCast:",msg.payload);
var message;
if (node.base64) {
message = new Buffer(msg.payload,'base64');
}
else {
message = new Buffer(msg.payload);
}
sock.send(message, 0, message.length, node.port, node.group, function(err, bytes) {
if (err) node.error("udp : "+err);
//util.log('[socket out] udp :' +bytes);
});
}
});
this._close = function() {
sock.close();
node.log('udp multicaster stopped');
}
}
RED.nodes.registerType("multicast out",MCastOut);
MCastOut.prototype.close = function() {
this._close();
}