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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');
var querystring = require('querystring');
RED.httpAdmin.get('/MySQLdatabase/: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 {
res.send(JSON.stringify({}));
}
});
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RED.httpAdmin.delete('/MySQLdatabase/:id',function(req,res) {
RED.nodes.deleteCredentials(req.params.id);
res.send(200);
});
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RED.httpAdmin.post('/MySQLdatabase/:id',function(req,res) {
var body = "";
req.on('data', function(chunk) {
body+=chunk;
});
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 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;
var credentials = {};
if (n.user) {
credentials.user = n.user;
credentials.password = n.pass;
RED.nodes.addCredentials(n.id,credentials);
this.user = n.user;
this.password = n.pass;
} else {
credentials = RED.nodes.getCredentials(n.id);
if (credentials) {
this.user = credentials.user;
this.password = credentials.password;
}
}
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this.dbname = n.db;
var node = this;
function doConnect() {
node.connecting = true;
node.connection = mysqldb.createConnection({
host : node.host,
port : node.port,
user : node.user,
password : node.password,
database : node.dbname,
timezone : node.tz,
insecureAuth: true
});
node.connection.connect(function(err) {
node.connecting = false;
if (err) {
node.warn(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 () {
if (this.tick) { clearTimeout(this.tick); }
if (this.connection) {
node.connection.end(function(err) {
if (err) { node.error(err); }
});
}
});
}
RED.nodes.registerType("MySQLdatabase",MySQLNode);
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);
node.mydbConfig.connection.query(msg.topic, function(err, rows) {
if (err) { node.warn(err); }
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);
}