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node-red-nodes/storage/mysql/68-mysql.js

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module.exports = function(RED) {
"use strict";
var reconnect = RED.settings.mysqlReconnectTime || 20000;
var mysqldb = require('mysql');
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function MySQLNode(n) {
RED.nodes.createNode(this,n);
this.host = n.host;
this.port = n.port;
this.tz = n.tz || "local";
this.connected = false;
this.connecting = false;
this.dbname = n.db;
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this.setMaxListeners(0);
var node = this;
function checkVer() {
node.connection.query("SELECT version();", [], function(err, rows) {
if (err) {
node.connection.release();
node.error(err);
node.status({fill:"red",shape:"ring",text:"Bad Ping"});
doConnect();
}
});
}
function doConnect() {
node.connecting = true;
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node.emit("state","connecting");
if (!node.pool) {
node.pool = mysqldb.createPool({
host : node.host,
port : node.port,
user : node.credentials.user,
password : node.credentials.password,
database : node.dbname,
timezone : node.tz,
insecureAuth: true,
multipleStatements: true,
connectionLimit: 25
});
}
node.pool.getConnection(function(err, connection) {
node.connecting = false;
if (err) {
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node.emit("state",err.code);
node.error(err);
node.tick = setTimeout(doConnect, reconnect);
}
else {
node.connection = connection;
node.connected = true;
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node.emit("state","connected");
node.connection.on('error', function(err) {
node.connected = false;
node.connection.release();
node.emit("state",err.code);
if (err.code === 'PROTOCOL_CONNECTION_LOST') {
doConnect(); // silently reconnect...
}
else if (err.code === 'ECONNRESET') {
doConnect(); // silently reconnect...
}
else {
node.error(err);
doConnect();
}
});
if (!node.check) { node.check = setInterval(checkVer, 290000); }
}
});
}
this.connect = function() {
if (!this.connected && !this.connecting) {
doConnect();
}
}
this.on('close', function (done) {
if (this.tick) { clearTimeout(this.tick); }
if (this.check) { clearInterval(this.check); }
node.connected = false;
node.connection.release();
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node.emit("state"," ");
node.pool.end(function (err) { done(); });
});
}
RED.nodes.registerType("MySQLdatabase",MySQLNode, {
credentials: {
user: {type: "text"},
password: {type: "password"}
}
});
function MysqlDBNodeIn(n) {
RED.nodes.createNode(this,n);
this.mydb = n.mydb;
this.mydbConfig = RED.nodes.getNode(this.mydb);
this.status({});
if (this.mydbConfig) {
this.mydbConfig.connect();
var node = this;
var busy = false;
var status = {};
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node.mydbConfig.on("state", function(info) {
if (info === "connecting") { node.status({fill:"grey",shape:"ring",text:info}); }
else if (info === "connected") { node.status({fill:"green",shape:"dot",text:info}); }
else {
if (info === "ECONNREFUSED") { info = "connection refused"; }
if (info === "PROTOCOL_CONNECTION_LOST") { info = "connection lost"; }
node.status({fill:"red",shape:"ring",text:info});
}
});
node.on("input", function(msg) {
if (node.mydbConfig.connected) {
if (typeof msg.topic === 'string') {
//console.log("query:",msg.topic);
var bind = [];
if (Array.isArray(msg.payload)) { bind = msg.payload; }
else if (typeof msg.payload === 'object' && msg.payload !== null) {
bind=msg.payload;
node.mydbConfig.connection.config.queryFormat = function (query, values) {
if (!values){
return query;
}
return query.replace(/\:(\w+)/g, function (txt, key) {
if (values.hasOwnProperty(key)) {
return this.escape(values[key]);
}
return txt;
}.bind(this));
};
}
node.mydbConfig.connection.query(msg.topic, bind, function(err, rows) {
if (err) {
status = {fill:"red",shape:"ring",text:"Error: "+err.code};
node.status(status);
node.error(err,msg);
}
else {
if (rows.constructor.name === "OkPacket") {
msg.payload = JSON.parse(JSON.stringify(rows));
}
else { msg.payload = rows; }
node.send(msg);
status = {fill:"green",shape:"dot",text:"OK"};
node.status(status);
}
});
}
else {
if (typeof msg.topic !== 'string') { node.error("msg.topic : the query is not defined as a string"); }
}
}
else {
node.error("Database not connected",msg);
status = {fill:"red",shape:"ring",text:"not yet connected"};
}
if (!busy) {
busy = true;
node.status(status);
node.tout = setTimeout(function() { busy = false; node.status(status); },500);
}
});
node.on('close', function () {
if (node.tout) { clearTimeout(node.tout); }
node.mydbConfig.removeAllListeners();
node.status({});
});
}
else {
this.error("MySQL database not configured");
}
}
RED.nodes.registerType("mysql",MysqlDBNodeIn);
}