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node-red/nodes/core/io/10-mqtt.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 connectionPool = require("./lib/mqttConnectionPool");
var util = require("util");
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function MQTTBrokerNode(n) {
RED.nodes.createNode(this,n);
this.broker = n.broker;
this.port = n.port;
this.clientid = n.clientid;
var credentials = RED.nodes.getCredentials(n.id);
if (credentials) {
this.username = credentials.user;
this.password = credentials.password;
}
}
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RED.nodes.registerType("mqtt-broker",MQTTBrokerNode);
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var querystring = require('querystring');
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RED.httpAdmin.get('/mqtt-broker/:id',function(req,res) {
var credentials = RED.nodes.getCredentials(req.params.id);
if (credentials) {
res.send(JSON.stringify({user:credentials.user,hasPassword:(credentials.password&&credentials.password!="")}));
} else {
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res.send(JSON.stringify({}));
}
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});
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RED.httpAdmin.delete('/mqtt-broker/:id',function(req,res) {
RED.nodes.deleteCredentials(req.params.id);
res.send(200);
});
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RED.httpAdmin.post('/mqtt-broker/:id',function(req,res) {
var body = "";
req.on('data', function(chunk) {
body+=chunk;
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});
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req.on('end', function(){
var newCreds = querystring.parse(body);
var credentials = RED.nodes.getCredentials(req.params.id)||{};
if (newCreds.user == null || newCreds.user == "") {
delete credentials.user;
} else {
credentials.user = newCreds.user;
}
if (newCreds.password == "") {
delete credentials.password;
} else {
credentials.password = newCreds.password||credentials.password;
}
RED.nodes.addCredentials(req.params.id,credentials);
res.send(200);
});
});
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function MQTTInNode(n) {
RED.nodes.createNode(this,n);
this.topic = n.topic;
this.broker = n.broker;
this.brokerConfig = RED.nodes.getNode(this.broker);
if (this.brokerConfig) {
this.status({fill:"red",shape:"ring",text:"disconnected"});
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this.client = connectionPool.get(this.brokerConfig.broker,this.brokerConfig.port,this.brokerConfig.clientid,this.brokerConfig.username,this.brokerConfig.password);
var node = this;
this.client.subscribe(this.topic,2,function(topic,payload,qos,retain) {
var msg = {topic:topic,payload:payload,qos:qos,retain:retain};
if ((node.brokerConfig.broker == "localhost")||(node.brokerConfig.broker == "127.0.0.1")) {
msg._topic = topic;
}
node.send(msg);
});
this.client.on("connectionlost",function() {
node.status({fill:"red",shape:"ring",text:"disconnected"});
});
this.client.on("connect",function() {
node.status({fill:"green",shape:"dot",text:"connected"});
});
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this.client.connect();
} else {
this.error("missing broker configuration");
}
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}
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RED.nodes.registerType("mqtt in",MQTTInNode);
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MQTTInNode.prototype.close = function() {
if (this.client) {
this.client.disconnect();
}
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}
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function MQTTOutNode(n) {
RED.nodes.createNode(this,n);
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this.topic = n.topic;
this.broker = n.broker;
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this.brokerConfig = RED.nodes.getNode(this.broker);
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if (this.brokerConfig) {
this.status({fill:"red",shape:"ring",text:"disconnected"},true);
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this.client = connectionPool.get(this.brokerConfig.broker,this.brokerConfig.port,this.brokerConfig.clientid,this.brokerConfig.username,this.brokerConfig.password);
this.on("input",function(msg) {
if (msg != null) {
if (this.topic) {
msg.topic = this.topic;
}
this.client.publish(msg);
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}
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});
var node = this;
this.client.on("connectionlost",function() {
node.status({fill:"red",shape:"ring",text:"disconnected"});
});
this.client.on("connect",function() {
node.status({fill:"green",shape:"dot",text:"connected"});
});
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this.client.connect();
} else {
this.error("missing broker configuration");
}
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}
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RED.nodes.registerType("mqtt out",MQTTOutNode);
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MQTTOutNode.prototype.close = function() {
if (this.client) {
this.client.disconnect();
}
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}
}