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node-red-nodes/storage/mysql/68-mysql.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.
**/
module.exports = function(RED) {
"use strict";
var reconnect = RED.settings.mysqlReconnectTime || 30000;
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;
var node = this;
function doConnect() {
node.connecting = true;
node.connection = mysqldb.createConnection({
host : node.host,
port : node.port,
user : node.credentials.user,
password : node.credentials.password,
database : node.dbname,
timezone : node.tz,
insecureAuth: true,
multipleStatements: true
});
node.connection.connect(function(err) {
node.connecting = false;
if (err) {
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node.error(err);
node.tick = setTimeout(doConnect, reconnect);
} else {
node.connected = true;
}
});
node.connection.on('error', function(err) {
node.connected = false;
if (err.code === 'PROTOCOL_CONNECTION_LOST') {
doConnect(); // silently reconnect...
} else {
node.error(err);
doConnect();
}
});
}
this.connect = function() {
if (!this.connected && !this.connecting) {
doConnect();
}
}
this.on('close', function (done) {
if (this.tick) { clearTimeout(this.tick); }
if (this.connection) {
node.connection.end(function(err) {
if (err) { node.error(err); }
done();
});
} else {
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);
if (this.mydbConfig) {
this.mydbConfig.connect();
var node = this;
node.on("input", function(msg) {
if (typeof msg.topic === 'string') {
//console.log("query:",msg.topic);
var bind = Array.isArray(msg.payload) ? msg.payload : [];
node.mydbConfig.connection.query(msg.topic, bind, function(err, rows) {
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if (err) { node.error(err,msg); }
else {
msg.payload = rows;
node.send(msg);
}
});
}
else {
if (typeof msg.topic !== 'string') { node.error("msg.topic : the query is not defined as a string"); }
}
});
}
else {
this.error("MySQL database not configured");
}
}
RED.nodes.registerType("mysql",MysqlDBNodeIn);
}