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node-red/nodes/io/31-tcpin.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");
var reconnectTime = RED.settings.socketReconnectTime||10000;
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var net = require('net');
function TcpIn(n) {
RED.nodes.createNode(this,n);
this.host = n.host;
this.port = n.port * 1;
this.topic = n.topic;
this.stream = (!n.datamode||n.datamode=='stream'); /* stream,single*/
this.datatype = n.datatype||'buffer'; /* buffer,utf8,base64 */
this.newline = (n.newline||"").replace("\\n","\n").replace("\\r","\r");
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this.base64 = n.base64;
this.server = (typeof n.server == 'boolean')?n.server:(n.server == "server");
this.closing = false;
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var node = this;
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if (!node.server) {
var buffer = null;
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var client;
var reconnectTimeout;
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function setupTcpClient() {
node.log("connecting to "+node.host+":"+node.port);
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client = net.connect(node.port, node.host, function() {
buffer = (node.datatype == 'buffer')? new Buffer(0):"";
node.log("connected to "+node.host+":"+node.port);
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});
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client.on('data', function (data) {
if (node.datatype != 'buffer') {
data = data.toString(node.datatype);
}
if (node.stream) {
if ((typeof data) === "string" && node.newline != "") {
buffer = buffer+data;
var parts = buffer.split(node.newline);
for (var i = 0;i<parts.length-1;i+=1) {
var msg = {topic:node.topic, payload:parts[i]};
node.send(msg);
}
buffer = parts[parts.length-1];
} else {
var msg = {topic:node.topic, payload:data};
node.send(msg);
}
} else {
if ((typeof data) === "string") {
buffer = buffer+data;
} else {
buffer = Buffer.concat([buffer,data],buffer.length+data.length);
}
}
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});
client.on('end', function() {
if (!node.stream || (node.datatype == "utf8" && node.newline != "" && buffer.length > 0)) {
var msg = {topic:node.topic,payload:buffer};
node.send(msg);
buffer = null;
}
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});
client.on('close', function() {
node.log("connection lost to "+node.host+":"+node.port);
if (!node.closing) {
reconnectTimeout = setTimeout(setupTcpClient, reconnectTime);
}
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});
client.on('error', function(err) {
node.log(err);
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});
}
setupTcpClient();
this._close = function() {
this.closing = true;
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client.end();
clearTimeout(reconnectTimeout);
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}
} else {
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var server = net.createServer(function (socket) {
var buffer = (node.datatype == 'buffer')? new Buffer(0):"";
socket.on('data', function (data) {
if (node.datatype != 'buffer') {
data = data.toString(node.datatype);
}
if (node.stream) {
if ((typeof data) === "string" && node.newline != "") {
buffer = buffer+data;
var parts = buffer.split(node.newline);
for (var i = 0;i<parts.length-1;i+=1) {
var msg = {topic:node.topic, payload:parts[i]};
node.send(msg);
}
buffer = parts[parts.length-1];
} else {
var msg = {topic:node.topic, payload:data};
node.send(msg);
}
} else {
if ((typeof data) === "string") {
buffer = buffer+data;
} else {
buffer = Buffer.concat([buffer,data],buffer.length+data.length);
}
}
});
socket.on('end', function() {
if (!node.stream || (node.datatype == "utf8" && node.newline != "" && buffer.length > 0)) {
var msg = {topic:node.topic,payload:buffer};
node.send(msg);
buffer = null;
}
});
socket.on('error',function(err) {
node.log(err);
});
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});
server.listen(node.port);
node.log('listening on port '+node.port);
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this._close = function() {
this.closing = true;
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server.close();
node.log('stopped listening on port '+node.port);
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}
}
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}
RED.nodes.registerType("tcp in",TcpIn);
TcpIn.prototype.close = function() {
this._close();
}