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node-red/nodes/core/io/32-udp.js

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/**
* 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.
**/
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module.exports = function(RED) {
"use strict";
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var dgram = require('dgram');
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// The Input Node
function UDPin(n) {
RED.nodes.createNode(this,n);
this.group = n.group;
this.port = n.port;
this.datatype = n.datatype;
this.iface = n.iface || null;
this.multicast = n.multicast;
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this.ipv = n.ipv || "udp4";
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var node = this;
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var server = dgram.createSocket(node.ipv); // default to ipv4
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server.on("error", function (err) {
if ((err.code == "EACCES") && (node.port < 1024)) {
node.error(RED._("udp.errors.access-error"));
} else {
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node.error(RED._("udp.errors.error",{error:err.code}));
}
server.close();
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});
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server.on('message', function (message, remote) {
var msg;
if (node.datatype =="base64") {
msg = { payload:message.toString('base64'), fromip:remote.address+':'+remote.port, ip:remote.address, port:remote.port };
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} else if (node.datatype =="utf8") {
msg = { payload:message.toString('utf8'), fromip:remote.address+':'+remote.port, ip:remote.address, port:remote.port };
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} else {
msg = { payload:message, fromip:remote.address+':'+remote.port, ip:remote.address, port:remote.port };
}
node.send(msg);
});
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server.on('listening', function () {
var address = server.address();
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node.log(RED._("udp.status.listener-at",{host:address.address,port:address.port}));
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if (node.multicast == "true") {
server.setBroadcast(true);
try {
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server.setMulticastTTL(128);
server.addMembership(node.group,node.iface);
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node.log(RED._("udp.status.mc-group",{group:node.group}));
} catch (e) {
if (e.errno == "EINVAL") {
node.error(RED._("udp.errors.bad-mcaddress"));
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} else if (e.errno == "ENODEV") {
node.error(RED._("udp.errors.interface"));
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} else {
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node.error(RED._("udp.errors.error",{error:e.errno}));
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}
}
}
});
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node.on("close", function() {
try {
server.close();
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node.log(RED._("udp.status.listener-stopped"));
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} catch (err) {
node.error(err);
}
});
// Hack for when you have both in and out udp nodes sharing a port
// if udp in starts last it shares better - so give it a chance to be last
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setTimeout( function() { server.bind(node.port,node.iface); }, 250);
}
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RED.nodes.registerType("udp in",UDPin);
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// The Output Node
function UDPout(n) {
RED.nodes.createNode(this,n);
//this.group = n.group;
this.port = n.port;
this.outport = n.outport||"";
this.base64 = n.base64;
this.addr = n.addr;
this.iface = n.iface || null;
this.multicast = n.multicast;
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this.ipv = n.ipv || "udp4";
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var node = this;
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var sock = dgram.createSocket(node.ipv); // default to ipv4
sock.on("error", function(err) {
// Any async error will also get reported in the sock.send call.
// This handler is needed to ensure the error marked as handled to
// prevent it going to the global error handler and shutting node-red
// down.
});
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if (node.multicast != "false") {
if (node.outport == "") { node.outport = node.port; }
sock.bind(node.outport, function() { // have to bind before you can enable broadcast...
sock.setBroadcast(true); // turn on broadcast
if (node.multicast == "multi") {
try {
sock.setMulticastTTL(128);
sock.addMembership(node.addr,node.iface); // Add to the multicast group
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node.log(RED._("udp.status.mc-ready",{outport:node.outport,host:node.addr,port:node.port}));
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} catch (e) {
if (e.errno == "EINVAL") {
node.error(RED._("udp.errors.bad-mcaddress"));
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} else if (e.errno == "ENODEV") {
node.error(RED._("udp.errors.interface"));
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} else {
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node.error(RED._("udp.errors.error",{error:e.errno}));
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}
}
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} else {
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node.log(RED._("udp.status.bc-ready",{outport:node.outport,host:node.addr,port:node.port}));
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}
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});
} else if (node.outport != "") {
sock.bind(node.outport);
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node.log(RED._("udp.errors.ready",{outport:node.outport,host:node.addr,port:node.port}));
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} else {
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node.log(RED._("udp.errors.ready-nolocal",{host:node.addr,port:node.port}));
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}
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node.on("input", function(msg) {
if (msg.hasOwnProperty("payload")) {
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var add = node.addr || msg.ip || "";
var por = node.port || msg.port || 0;
if (add == "") {
node.warn(RED._("udp.errors.ip-notset"));
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} else if (por == 0) {
node.warn(RED._("udp.errors.port-notset"));
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} else if (isNaN(por) || (por < 1) || (por > 65535)) {
node.warn(RED._("udp.errors.port-invalid"));
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} else {
var message;
if (node.base64) {
message = new Buffer(msg.payload, 'base64');
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} else if (msg.payload instanceof Buffer) {
message = msg.payload;
} else {
message = new Buffer(""+msg.payload);
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}
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sock.send(message, 0, message.length, por, add, function(err, bytes) {
if (err) {
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node.error("udp : "+err,msg);
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}
message = null;
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});
}
}
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});
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node.on("close", function() {
try {
sock.close();
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node.log(RED._("udp.status.output-stopped"));
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} catch (err) {
node.error(err);
}
});
}
RED.nodes.registerType("udp out",UDPout);
}