node-red/nodes/io/30-socketin.js

/**
 * 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");

function SocketIn(n) {
	RED.nodes.createNode(this,n);
	this.port = n.port;
	this.topic = n.topic;
	this.trans = (n.transport||n.trans||"").toLowerCase();
	var node = this;
	if (this.trans == "http") {
		var http = require('http');
		var serv = http.createServer(function (req, res) {
			//node.log("http "+req.url);
			var msg = {topic:node.topic,payload:req.url.slice(1)};
			node.send(msg);
			res.writeHead(304, {'Content-Type': 'text/plain'});
			res.end('\n');
		}).listen(node.port);
		node.log('http listener at http://127.0.0.1:'+node.port+'/');

		this._close = function() {
			serv.close();
			node.log('http listener stopped');
		}
	}

	if (this.trans == "tcp") {
		var net = require('net');
		var server = net.createServer(function (socket) {
			var buffer = null;
			socket.on('data', function (chunk) {
			    if (buffer == null) {
			        buffer = chunk;
			    } else {
			        buffer = Buffer.concat([buffer,chunk]);
			    }
			});
			socket.on('end', function() {
				var msg = {topic:node.topic, payload:buffer, fromip:socket.remoteAddress+':'+socket.remotePort};
				node.send(msg);
			});
		});
		server.on('error', function (e) {
			if (e.code == 'EADDRINUSE') {
				setTimeout(node.error('TCP port is already in use - please reconfigure socket.'),250);
			}
		});
		server.listen(node.port);
		node.log('tcp listener on port :'+node.port);

		this._close = function() {
			server.close();
			node.log('tcp listener stopped');
		}
	}

	if (this.trans == "tcpc") {
		var net = require('net');
		var client;
		var to;
		function setupTcpClient() {
			node.log('tcpc connecting to port :'+node.port);
			client = net.connect({port: node.port}, function() {
				node.log("tcpc connected");
			});

			client.on('data', function (data) {
				var msg = {topic:node.topic, payload:data};
				node.send(msg);
			});

			client.on('end', function() {
				node.log("tcpc socket ended");
			});

			client.on('close', function() {
				node.log('tcpc socket closed');
				to = setTimeout(setupTcpClient, 10000); //Try to reconnect
			});

			client.on('error', function() {
				node.log('tcpc socket error');
				to = setTimeout(setupTcpClient, 10000); //Try to reconnect
			});
		}
		setupTcpClient();

		this._close = function() {
			client.end();
			//client.destroy();
			clearTimeout(to);
			node.log('tcpc stopped client');
		}
		setupTcpClient();
	}

	if (this.trans == "udp") {
		var dgram = require('dgram');
		var server = dgram.createSocket('udp4');
		server.on('listening', function () {
			var address = server.address();
			node.log('udp listener at ' + address.address + ":" + address.port);
		});
		server.on('message', function (message, remote) {
			var msg = {topic:node.topic,payload:message,fromip:remote.address+':'+remote.port};
			node.send(msg);
		});
		server.bind(node.port);

		this._close = function() {
			server.close();
			node.log('udp listener stopped');
		}
	}

}

RED.nodes.registerType("socket in",SocketIn);

SocketIn.prototype.close = function() {
	this._close();
}