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node-red/nodes/io/30-socketin.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.
**/
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 server = http.createServer(function (req, res) {
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//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);
server.on('error', function (e) {
if (e.code == 'EADDRINUSE') {
setTimeout(node.error('TCP port is already in use - please reconfigure socket.'),250);
}
else { console.log(e); }
server = null;
});
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node.log('http listener at http://127.0.0.1:'+node.port+'/');
this._close = function() {
if (server) server.close();
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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]);
}
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});
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);
}
else { console.log(e); }
server = null;
});
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server.listen(node.port);
node.log('tcp listener on port :'+node.port);
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this._close = function() {
if (server) server.close();
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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');
client = null;
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to = setTimeout(setupTcpClient, 10000); //Try to reconnect
});
}
setupTcpClient();
this._close = function() {
if (client) client.end();
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//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.on('error', function (e) {
console.log(e);
server = null;
});
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server.bind(node.port);
this._close = function() {
if (server) server.close();
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node.log('udp listener stopped');
}
}
}
RED.nodes.registerType("socket in",SocketIn);
SocketIn.prototype.close = function() {
this._close();
}