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node-red/nodes/core/io/10-mqtt.js

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/**
* Copyright 2013,2015 IBM Corp.
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*
* 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";
var mqtt = require("mqtt");
var util = require("util");
var isUtf8 = require('is-utf8');
function matchTopic(ts,t) {
if (ts == "#") {
return true;
}
var re = new RegExp("^"+ts.replace(/([\[\]\?\(\)\\\\$\^\*\.|])/g,"\\$1").replace(/\+/g,"[^/]+").replace(/\/#$/,"(\/.*)?")+"$");
return re.test(t);
}
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function MQTTBrokerNode(n) {
RED.nodes.createNode(this,n);
// Configuration options passed by Node Red
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this.broker = n.broker;
this.port = n.port;
this.clientid = n.clientid;
this.usetls = n.usetls;
this.verifyservercert = n.verifyservercert;
this.compatmode = n.compatmode;
this.keepalive = n.keepalive;
this.cleansession = n.cleansession;
// Config node state
this.brokerurl = "";
this.connected = false;
this.connecting = false;
this.options = {};
this.queue = [];
this.subscriptions = {};
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if (n.birthTopic) {
this.birthMessage = {
topic: n.birthTopic,
payload: n.birthPayload || "",
qos: Number(n.birthQos||0),
retain: n.birthRetain=="true"|| n.birthRetain===true
};
}
if (this.credentials) {
this.username = this.credentials.user;
this.password = this.credentials.password;
}
// If the config node is missing certain options (it was probably deployed prior to an update to the node code),
// select/generate sensible options for the new fields
if (typeof this.usetls === 'undefined'){
this.usetls = false;
}
if (typeof this.compatmode === 'undefined'){
this.compatmode = true;
}
if (typeof this.verifyservercert === 'undefined'){
this.verifyservercert = false;
}
if (typeof this.keepalive === 'undefined'){
this.keepalive = 15;
} else if (typeof this.keepalive === 'string') {
this.keepalive = Number(this.keepalive);
}
if (typeof this.cleansession === 'undefined') {
this.cleansession = true;
}
// Create the URL to pass in to the MQTT.js library
if (this.brokerurl == "") {
if (this.usetls) {
this.brokerurl="mqtts://";
} else {
this.brokerurl="mqtt://";
}
if (this.broker != "") {
this.brokerurl = this.brokerurl+this.broker+":"+this.port;
} else {
this.brokerurl = this.brokerurl+"localhost:1883";
}
}
if (!this.cleansession && !this.clientid) {
this.cleansession = true;
this.warn(RED._("mqtt.errors.nonclean-missingclientid"));
}
// Build options for passing to the MQTT.js API
this.options.clientId = this.clientid || 'mqtt_' + (1+Math.random()*4294967295).toString(16);
this.options.username = this.username;
this.options.password = this.password;
this.options.keepalive = this.keepalive;
this.options.clean = this.cleansession;
this.options.reconnectPeriod = RED.settings.mqttReconnectTime||5000;
if (this.compatmode == "true" || this.compatmode === true){
this.options.protocolId = 'MQIsdp';
this.options.protocolVersion = 3;
}
this.options.rejectUnauthorized = (this.verifyservercert == "true" || this.verifyservercert === true)
if (n.willTopic) {
this.options.will = {
topic: n.willTopic,
payload: n.willPayload || "",
qos: Number(n.willQos||0),
retain: n.willRetain=="true"|| n.willRetain===true
};
}
// Define functions called by MQTT in and out nodes
var node = this;
this.users = {};
this.register = function(mqttNode){
node.users[mqttNode.id] = mqttNode;
if (Object.keys(node.users).length === 1) {
node.connect();
}
};
this.deregister = function(mqttNode){
delete node.users[mqttNode.id];
if (Object.keys(node.users).length === 0) {
node.client.end();
}
};
this.connect = function () {
if (!node.connected && !node.connecting) {
node.connecting = true;
node.client = mqtt.connect(node.brokerurl ,node.options);
node.client.setMaxListeners(0);
// Register successful connect or reconnect handler
node.client.on('connect', function () {
node.connecting = false;
node.connected = true;
node.log(RED._("mqtt.state.connected",{broker:(node.clientid?node.clientid+"@":"")+node.brokerurl}));
for (var id in node.users) {
if (node.users.hasOwnProperty(id)) {
node.users[id].status({fill:"green",shape:"dot",text:"common.status.connected"});
}
}
// Remove any existing listeners before resubscribing to avoid duplicates in the event of a re-connection
node.client.removeAllListeners('message');
// Re-subscribe to stored topics
for (var s in node.subscriptions) {
var topic = s;
var qos = 0;
for (var r in node.subscriptions[s]) {
qos = Math.max(qos,node.subscriptions[s][r].qos);
node.client.on('message',node.subscriptions[s][r].handler);
}
var options = {qos: qos};
node.client.subscribe(topic, options);
}
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// Send any birth message
if (node.birthMessage) {
node.publish(node.birthMessage);
}
// Send any queued messages
while(node.queue.length) {
var msg = node.queue.shift();
//console.log(msg);
node.publish(msg);
}
});
// Register disconnect handlers
node.client.on('close', function () {
if (node.connected) {
node.connected = false;
node.log(RED._("mqtt.state.disconnected",{broker:(node.clientid?node.clientid+"@":"")+node.brokerurl}));
for (var id in node.users) {
if (node.users.hasOwnProperty(id)) {
node.users[id].status({fill:"red",shape:"ring",text:"common.status.disconnected"});
}
}
} else if (node.connecting) {
node.log(RED._("mqtt.state.connect-failed",{broker:(node.clientid?node.clientid+"@":"")+node.brokerurl}));
}
});
// Register connect error handler
node.client.on('error', function (error) {
if (node.connecting) {
node.client.end();
node.connecting = false;
}
});
}
};
this.subscribe = function (topic,qos,callback,ref) {
ref = ref||0;
node.subscriptions[topic] = node.subscriptions[topic]||{};
var sub = {
topic:topic,
qos:qos,
handler:function(mtopic,mpayload, mpacket) {
if (matchTopic(topic,mtopic)) {
callback(mtopic,mpayload, mpacket);
}
},
ref: ref
};
node.subscriptions[topic][ref] = sub;
if (node.connected) {
node.client.on('message',sub.handler);
var options = {};
options.qos = qos;
node.client.subscribe(topic, options);
}
};
this.unsubscribe = function (topic, ref) {
ref = ref||0;
var sub = node.subscriptions[topic];
if (sub) {
if (sub[ref]) {
node.client.removeListener('message',sub[ref].handler);
delete sub[ref];
}
if (Object.keys(sub).length == 0) {
delete node.subscriptions[topic];
if (node.connected){
node.client.unsubscribe(topic);
}
}
}
};
this.publish = function (msg) {
if (node.connected) {
if (!Buffer.isBuffer(msg.payload)) {
if (typeof msg.payload === "object") {
msg.payload = JSON.stringify(msg.payload);
} else if (typeof msg.payload !== "string") {
msg.payload = "" + msg.payload;
}
}
var options = {
qos: msg.qos || 0,
retain: msg.retain || false
};
node.client.publish(msg.topic, msg.payload, options, function (err){return});
} else {
if (!node.connecting) {
node.connect();
}
node.queue.push(msg);
}
};
this.on('close', function(done) {
if (this.connected) {
this.client.on('close', function() {
done();
});
this.client.end();
} else {
done();
}
});
}
RED.nodes.registerType("mqtt-broker",MQTTBrokerNode,{
credentials: {
user: {type:"text"},
password: {type: "password"}
}
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});
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function MQTTInNode(n) {
RED.nodes.createNode(this,n);
this.topic = n.topic;
this.broker = n.broker;
this.brokerConn = RED.nodes.getNode(this.broker);
var node = this;
if (this.brokerConn) {
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this.status({fill:"red",shape:"ring",text:"common.status.disconnected"});
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if (this.topic) {
this.brokerConn.subscribe(this.topic,2,function(topic,payload,packet) {
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if (isUtf8(payload)) { payload = payload.toString(); }
var msg = {topic:topic,payload:payload, qos: packet.qos, retain: packet.retain};
if ((node.brokerConn.broker === "localhost")||(node.brokerConn.broker === "127.0.0.1")) {
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msg._topic = topic;
}
node.send(msg);
}, this.id);
if (this.brokerConn.connected) {
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node.status({fill:"green",shape:"dot",text:"common.status.connected"});
}
node.brokerConn.register(this);
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}
else {
this.error(RED._("mqtt.errors.not-defined"));
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}
this.on('close', function() {
if (node.brokerConn) {
node.brokerConn.unsubscribe(node.topic,node.id);
node.brokerConn.deregister(node);
}
});
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} else {
this.error(RED._("mqtt.errors.missing-config"));
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}
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}
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RED.nodes.registerType("mqtt in",MQTTInNode);
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function MQTTOutNode(n) {
RED.nodes.createNode(this,n);
this.topic = n.topic;
this.qos = n.qos || null;
this.retain = n.retain;
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this.broker = n.broker;
this.brokerConn = RED.nodes.getNode(this.broker);
var node = this;
if (this.brokerConn) {
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this.status({fill:"red",shape:"ring",text:"common.status.disconnected"});
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this.on("input",function(msg) {
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if (msg.qos) {
msg.qos = parseInt(msg.qos);
if ((msg.qos !== 0) && (msg.qos !== 1) && (msg.qos !== 2)) {
msg.qos = null;
}
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}
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msg.qos = Number(node.qos || msg.qos || 0);
msg.retain = node.retain || msg.retain || false;
msg.retain = ((msg.retain === true) || (msg.retain === "true")) || false;
if (node.topic) {
msg.topic = node.topic;
}
if ( msg.hasOwnProperty("payload")) {
if (msg.hasOwnProperty("topic") && (typeof msg.topic === "string") && (msg.topic !== "")) { // topic must exist
this.brokerConn.publish(msg); // send the message
}
else { node.warn(RED._("mqtt.errors.invalid-topic")); }
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}
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});
if (this.brokerConn.connected) {
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node.status({fill:"green",shape:"dot",text:"common.status.connected"});
}
node.brokerConn.register(node);
this.on('close', function() {
node.brokerConn.deregister(node);
});
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} else {
this.error(RED._("mqtt.errors.missing-config"));
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}
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}
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RED.nodes.registerType("mqtt out",MQTTOutNode);
};