Develop Reference

RGraph hide line plus labels with a click on key element

So, I have a graph like this:
What I'm trying to achieve is to hide the lines plus the labels with it when I click the key referring that line.
I found this on the docs and I tried doing this:
$(line.canvas).on('click', function (e) //line is the name of the graph of both green and red lines
{
var key = RGraph.Registry.get('key-element');
console.log(key);
if (key) {
console.log("true");
}
});
I found this to be pointless due the fact when I click on the keys they return weird outputs, either null or other key different from the one I want.
What I also found on RGraph Line API is that obj.hide([index]) only sets the color to rgba(0,0,0,0), which does not hide the labelsAbove property.
How can I fix this and make a proper hide of the lines when I click on the key?

Well this demo hides/shows the line but the labelsAbove labels are still there. So I'll have to look at this for the next beta.
Here's the code:
function createandcall(rackname, racknameid, stb) {
$('#maintable').append('<table class="table"><tbody><tr style="text-align:center"><td><h2>' + rackname + '</h2><table class="table"><tbody style="text-align:left"><tr id="STBL"></tr><tr id="STBL1"></tr><tr id="STBL2"></tr><tr id="STBL3"></tr></tbody></table></td></tr></tbody></table>');
for (i = 1; i < stb + 1; i++) {
createtable(i);
callstb(rackname, racknameid, i);
}
return;
}
function callstb(rackname, racknameid, i) {
$.ajax({
type: "GET",
dataType: 'text',
url: "http://localhost:3000/index/" + rackname + ' ' + racknameid + ' ' + i,
success: function (data) {
response = '\#stb' + i;
idtd = '\#tdstb' + i;
$(response).html(data.replace(/\[32m/gi, '').replace(/\[0\;33m/gi, '').replace(/\[0m/gi, '').replace(/\[33m/gi, '').replace(/\[37m/gi, '').replace(/\[31m/gi, ''));
pre = $(response).html().toString();
},
error: function (error) {
$("#error").html('Error trying to get the STBs report');
$("#error").show();
}
})
}
server.js:
app.get('/index/*', (req, res) => {
parsedparam = req.params[0].split(" ")
rackname = parsedparam[0]
racknameid = parsedparam[1]
stb = parseInt(parsedparam[2])
verifystbs(rackname, racknameid, stb, res);
});
function openconnection() {
con.connect(() => { console.log("RackChecker connected with database!") });
}
function closeconnection() {
con.end(() => { console.log("Connection Closed") });
}
function verifystbs(rackname, racknameid, stb, res) {
openconnection();
con.query("SELECT (SELECT UCASE(name) FROM models WHERE s.model = id) as Model,\
(SELECT UCASE(name) FROM manufacturers WHERE s.manufacturer = id) as Branch,\
(SELECT UCASE(name) FROM racks WHERE s.rack = id) as Rack,\
s.name as Stb,\
x.pr as Jira, \
x.reason as Reason,\
x.requestor AS Stress_Request,\
x.version as Version\
FROM \
stbs s \
LEFT JOIN \
stressrun x \
ON (s.active = 1 && s.rack = (SELECT id FROM racks WHERE name = '"+ racknameid + "')) \
WHERE x.id = (SELECT max(id) FROM stressrun y WHERE y.stb_id = s.id) and s.name like ('STB_%"+ stb + "')\
and x.reason in ('failed','other','new build') ORDER BY s.name;", (err, result) => {
console.log(result)
if (!Array.isArray(result) || !result.length) {
callnewstb = shell.exec('./shellscript/callnewstb.sh ' + rackname + ' ' + stb, { async: true });
callnewstb.stdout.on('data', (data) => {
res.send(data);
});
}
else {
for (i = 0; i < result.length; i++) {
parsestbnumber = result[i].Stb.split("_");
stbnumber = parseInt(parsestbnumber[1]);
stbnumber = stbnumber * 1;
if (stb == stbnumber) {
res.send("Stress Test is not running on <b>" + result[i].Stb + "</b><br>Reason: <b>" + result[i].Reason + "</b><br>Jira Ticket: <b><a href='https://link.jira.com/browse/" + result[i].Jira + "'>" + result[i].Jira + "</a></b><br>Build Version: <b>" + result[i].Version)
break
}
else {
callnewstb = shell.exec('./shellscript/callnewstb.sh ' + rackname + ' ' + stb, { async: true });
callnewstb.stdout.on('data', (data) => {
res.send(data);
})
}
}
}
});
closeconnection();
}

NJS-024: memory allocation failed in OracleDB - Nodejs

I am trying to run a query using OracleDB with Nodejs to get the view populated in the UI but I get a NJS-024: memory allocation failed error. Can someone help me out? The view contains 120 columns in total and when I query the view in SQL Developer, it works just fine.
ConnectionPool.js:
var path = require('path');
var oracledb = require('oracledb');
var poolMap = {};
var logger = require(path.join(global.root + '/app/util/logger.js'))();
function createPool(poolName, config, callback) {
oracledb.createPool(
config,
function(err, p) {
if (err){
logger.error(err);
return;
}
poolMap[poolName] = p;
callback(poolMap[poolName]);
}
);
}
function getPool(poolName) {
return poolMap[poolName];
}
module.exports = {
createPool: createPool,
getPool: getPool
};
This is my poolAttributes:
var pool;
oracledb.prefetchRows = 10000;
oracledb.maxRows = 400000;
var poolAttrs = {
user: dbcfg.username,
password: dbcfg.password,
connectString: dbcfg.connectionString,
connectionClass : 'Report API',
poolMin : 3,
poolMax : 10,
poolIncrement: 2,
poolTimeout : 600 //seconds
};
connectionPool.createPool("Reports", poolAttrs, function(connPool){
pool = connPool;
logger.info("Pool created by reports.");
});
This is my code:
router.post('/report/', jsonParser, function (req, res) {
var data = req.body,
startRow = data.startRow,
numRows = data.numRows,
sortCol = data.sortCol,
sortDir = data.sortDir;
var countQuery = 'SELECT COUNT(*) ' +
'FROM this_view ' ;
var query = 'SELECT * ' +
'FROM this_view' ;
var seg,
orderBy,
offset;
orderBy = ' ORDER BY UPPER(' + sortCol + ') ' + sortDir;
offset = ' OFFSET ' + startRow + ' ROWS FETCH NEXT ' + numRows + ' ROWS ONLY';
query += orderBy;
query += offset;
logger.info("Begin: " + (new Date().toString()));
async.parallel({
rows: function (callback) {
pool.getConnection(function (err, connection) {
logger.info("Begin Connection: " + (new Date().toString()));
if (err) {
logger.error(err.message);
return;
}
logger.info("Begin execute: " + (new Date().toString()));
connection.execute(
query,
{},
{
resultSet: true,
prefetchRows: 1000
},
function (err, results) {
logger.info("End execute: " + (new Date().toString()));
var rowsProcessed = 0;
var startTime;
if (err) {
logger.error(err.message);
callback("Something broke in the first thing");
doRelease(connection);
return;
}
var procJson = [];
function fetchRowsFromRS(connection, resultSet, numRows) {
resultSet.getRows(
numRows, // get this many rows
function (err, rows) {
if (err) {
console.error(err);
doClose(connection, resultSet); // always close the result set
} else if (rows.length >= 0) {
/**
* For each row in the result, pushes a new object to the rows array
* In each new object, the key is assigned and the result row value set
*/
for (var i = 0; i < rows.length; i++) {
procJson.push({});
console.log(procJson);
for (var j = 0; j < resultSet.metaData.length; j++) {
procJson[i][resultSet.metaData[j].name.toLowerCase()] = rows[i][j];
}
}
//TODO: Add null handling
logger.info("Send JSON: " + (new Date().toString()));
logger.info("JSON Sent: " + (new Date().toString()));
if (rows.length === numRows) // might be more rows
fetchRowsFromRS(connection, resultSet, numRows);
else
doClose(connection, resultSet); // always close the result set
} else { // no rows
doClose(connection, resultSet); // always close the result set
}
});
}
fetchRowsFromRS(connection, result.resultSet, numRows);
callback(null, procJson);
});
});
},
totalRows: function (callback) {
pool.getConnection(function (err, connection) {
logger.info("Begin Connection: " + (new Date().toString()));
if (err) {
logger.error(err.message);
return;
}
logger.info("Begin execute: " + (new Date().toString()));
connection.execute(
countQuery,
function (err, result) {
logger.info("End execute: " + (new Date().toString()));
if (err) {
logger.error(err.message);
callback("Something broke");
doRelease(connection);
return;
}
logger.info("Send JSON: " + (new Date().toString()));
console.log(result.rows);
callback(null, result.rows[0][0]);
logger.info("JSON Sent: " + (new Date().toString()));
doRelease(connection);
});
});
}
}, function(err, result){
if(err){
logger.error(err);
}
res.send(result);
});
});
If rows.length >=0 and if the query returns 0 results, I get this.

How much memory does your Node.js server have? You're setting maxRows very high and grabbing all the data in a single shot. This is likely causing you to run out of memory. Generally, the key is to balance round trips (which you want to reduce) with memory usage (which goes up as round trips are reduced.
You'll want to leverage the ResultSet API, which allows you to stream a read-consistent view of data in smaller chunks. Have a look at this for ideas: https://jsao.io/2015/07/an-overview-of-result-sets-in-the-nodejs-driver/
Rather than buffer the data in the Node.js server (which would lead to the same problem), you'll want to stream it down to the http request.
Finally, but perhaps most importantly, note that your code is currently open to SQL injection. Values that come in from users via req.body cannot be trusted. They must either be bound in using bind variables OR sanitized using something like dbms_assert.
Only values (like numRows) can be bound in. Identifiers (like sortCol) have to be sanitized. You'll likely want to do the sanitization in Node.js, so here's a really basic check that should help.
You could create an "assert" module:
function simpleSqlName(name) {
if (name.length > 30) {
throw new Error('Not simple SQL');
}
// Fairly generic, but effective. Would need to be adjusted to accommodate quoted identifiers,
// schemas, etc.
if (!/^[a-zA-Z0-9#_$]+$/.test(name)) {
throw new Error('Not simple SQL');
}
return name;
}
module.exports.simpleSqlName = simpleSqlName;
function validSortOrder(order) {
if (order !== 'desc' && order !== 'asc') {
throw new Error('Not valid sort order');
}
return order;
}
module.exports.validSortOrder = validSortOrder;
Then your code would look more like this (notice I'm using both the assert module and bind variables):
let assert = require('assert.js');
router.post('/report/', jsonParser, function (req, res) {
var data = req.body,
startRow = data.startRow,
numRows = data.numRows,
sortCol = assert.simpleSqlName(data.sortCol),
sortDir = assert.validSortOrder(data.sortDir);
var countQuery = 'SELECT COUNT(*) ' +
'FROM this_view ' ;
var query = 'SELECT * ' +
'FROM this_view' ;
var seg,
orderBy,
offset;
orderBy = ' ORDER BY UPPER(' + sortCol + ') ' + sortDir;
offset = ' OFFSET :start_row ROWS FETCH NEXT :num_rows ROWS ONLY';
query += orderBy;
query += offset;
logger.info("Begin: " + (new Date().toString()));
async.parallel({
rows: function (callback) {
pool.getConnection(function (err, connection) {
logger.info("Begin Connection: " + (new Date().toString()));
if (err) {
logger.error(err.message);
return;
}
logger.info("Begin execute: " + (new Date().toString()));
connection.execute(
query,
{
start_row: startRow,
num_rows: numRows
},
function (err, result) {
logger.info("End execute: " + (new Date().toString()));
if (err) {
logger.error(err.message);
callback("Something broke in the first thing");
doRelease(connection);
return;
}
console.log(result.rows);
var procJson = [];
/**
* For each row in the result, pushes a new object to the rows array
* In each new object, the key is assigned and the result row value set
*/
for (var i = 0; i < result.rows.length; i++) {
procJson.push({});
for (var j = 0; j < result.metaData.length; j++) {
procJson[i][result.metaData[j].name.toLowerCase()] = result.rows[i][j];
}
}
logger.info("Send JSON: " + (new Date().toString()));
callback(null, procJson);
logger.info("JSON Sent: " + (new Date().toString()));
doRelease(connection);
});
});
},
totalRows: function (callback) {
pool.getConnection(function (err, connection) {
logger.info("Begin Connection: " + (new Date().toString()));
if (err) {
logger.error(err.message);
return;
}
logger.info("Begin execute: " + (new Date().toString()));
connection.execute(
countQuery,
function (err, result) {
logger.info("End execute: " + (new Date().toString()));
if (err) {
logger.error(err.message);
callback("Something broke");
doRelease(connection);
return;
}
logger.info("Send JSON: " + (new Date().toString()));
console.log(result.rows);
callback(null, result.rows[0][0]);
logger.info("JSON Sent: " + (new Date().toString()));
doRelease(connection);
});
});
}
}, function(err, result){
if(err){
logger.error(err);
}
res.send(result);
});
});
Learn more about bind variables here: https://github.com/oracle/node-oracledb/blob/master/doc/api.md#bind
Also, check out the slides from a recent talk I gave. You may get something out of them... https://www.dropbox.com/s/2rhnu74z2y21gsy/Tips%20and%20Tricks%20for%20Getting%20Started%20with%20the%20Oracle%20Database%20Driver%20for%20Node.pdf?dl=0

MySQL, Node.js Sequential actions - How can I do that?

I've the following code:
function query1() {
var defered = Q.defer();
console.log("In query1");
var connection = mysql.createConnection({
host: '........',
user: 'm...c....a.....i',
password: '......Z....9...K',
database: '.....ol'
});
connection.connect(function(err) {
if (!err) {
console.log("Database is connected ...");
} else {
console.log("Error connecting database ...");
}
});
sql = '' +
'select c.ID as CENA_ID, ' +
' c.I_KEY as CENA_NUMERO, ' +
' c.NM_CENA as CENA_NOME, ' +
' b.DS_MAC as MAC_BOX, ' +
' v.DS_CLIENTID as ALEXA_ID, ' +
' v.FK_ID_GRUPO as GRUPO_ID ' +
' from TB_DISPOSITIVOS_VOZ v ' +
' inner join TB_GRUPOS g ' +
' on g.ID = v.FK_ID_GRUPO ' +
' inner join TB_CENAS c ' +
' on g.ID = c.FK_ID_GRUPO ' +
' inner join TB_CENTRAIS b ' +
' on g.ID = b.FK_ID_GRUPO ' +
'where v.DS_CLIENTID = "' + userId + '" ' +
'and lower(c.NM_CENA) like "%' + sceneName.toLowerCase() + '%"';
console.log("Created query");
try{
connection.query(sql, function(erro, rows, fields) {
if (!erro) {
console.log("Executed query verifying the userId");
contador = 0;
if (rows.length > 0) {
cena_id = rows[0].CENA_ID;
cena_numero = rows[0].CENA_NUMERO;
cena_nome = rows[0].CENA_NOME;
alexa_id = rows[0].ALEXA_ID;
grupo_id = rows[0].GRUPO_ID;
mac_box = rows[0].MAC_BOX;
contador = contador + 1;
}
console.log("contador: " + contador);
} else {
console.log("Error - getting the Alexa register in database" + erro);
context.fail("Error - getting the Alexa register in database" + erro);
}
});
}catch (ex){
console.log("exception: " + ex);
}
}
And this code as well:
Q.all([query1()]).then(function(results) {
console.log("Q.all log function");
if (contador > 0) {
console.log("contador > 0");
var client = mqtt.connect('mqtt://.............com');
console.log("connected to MQTT broker");
var buffer = [26,
0,0,0,0,555,645,0,0,0,0,0,
0,5555,2,Math.floor((Math.random() * 200) + 1),
0,0,0,333,13,4,0,1,0,
cena_numero
];
console.log("Created buffer");
client.on('connect', function() {
client.publish('n/c/' + mac_box + '/app', buffer);
console.log("sent MQTT");
});
speechOutput = "Command " + sceneName + " executed successfully";
repromptText = "";
console.log("Process executed successfully")
} else {
console.log("contador <= 0");
speechOutput = "This command was not found!";
repromptText = "";
}
}, function (reason) {
console.log("reason: " + reason);
});
How can I do for the second code execute only if the first query1() executed correctly? Because in the function query1() i've a MySQL Query, and I only can continue with the process after the result of this query.
Anyone can help me?
Thanks a lot!

You're missing some key concepts regarding callbacks and asynchronous behavior in Node.js. You're using the "Q" library (btw I'd recommend trying bluebird instead) to handle promises, but your "query1" function does not return a promise. That's why query1 executes but your "Q.all log function" will execute before query1 is finished.
You can structure your code like this instead (I'll give an example with bluebird since I'm more familiar with it):
var Promise = require('bluebird');
var _connection;
function query1() {
return new Promise(resolve, reject) {
//open your connection
connection.open(function (err, connection) {
if (err) return reject(err);
_connection = connection;
//do your query
_connection.query(sql, [params], function (err, data) {
if (err) return reject(err);
else resolve(data);
});
});
});
}
function query2(data) {
return new Promise(resolve, reject) {
//do your query, using data passed in from query1
_connection.query(sql, [params], function (err, data) {
if (err) return reject(err);
else resolve(data);
});
});
}
query1
.then(function (data) { query2(data); })
.catch(function (err) {
console.log('error:', err);
});
Also, just FYI, concatenating SQL string like this is a no-no that will open you up to a SQL injection attack:
like "%' + sceneName.toLowerCase() + '%"
Instead, use like "%?%" and call your SQL with connection.query(sql, [sceneName], function(err, data) {}). Hope this helps.

I solved my problem with asyncpackage like this:
var async = require('async');
async.series([
function(callback) {
//action 1...
},
function(callback){
//action 2...
}
], function(err) {
if (err) {
speechOutput = "Scene not found!";
repromptText = "Please try again.";
}
console.log("Before speechOutput");
callback(sessionAttributes,
buildSpeechletResponse(cardTitle, speechOutput, repromptText, shouldEndSession));
});

When I close anyone client, why is clearUp:Array empty?

console.log('clear arr: ' + clearnUP.join('-'));
My question is, when closing client, why is clearUp empty?
/* Beginners nodejs, fx, From China. */
var net = require('net');
var server = net.createServer();
var clients = [];
server.on('connection', function(client) {
client.write('hi\n\r');
clients.push(client);
client.on('data', function(data) {
printMsg(data, client);
});
client.on('end', function() {
clients.splice(clients.indexOf(client), 1);
});
client.on('error', function() {
console.log(err);
})
function printMsg(msg, client) {
var clearnUP = [];
for (var i = 0; i < clients.length; i++) {
client != clients[i] && (clients[i].writable ? clients[i].write(client.remotePort + ': ' + msg.toString() + '\n\r') : clearnUP.push(clients[i]) && clients[i].destroy() && clearnUP); // diswritable client push to clearUp<Array>
}
console.log(client.remotePort + ': ' + msg.toString());
console.log('clear arr: ' + clearnUP.join('-')); //when closed client, why clearUp is empty!!
}
//console.log(client);
}).listen(1220);

Ambiguous flow of node.js program execution

Please find the code below,
What i am still unable to understand in the code, is that why the browser keeps waiting for 10 seconds before executing the next query. Shouldn't it be just pass the sleep query to the database and then move on to execute the next one immediately?
var http = require('http');
var mysql = require('mysql');
http.createServer(function (request, response) {
var connection = mysql.createConnection({
host: 'localhost',
user: 'root',
password: '',
database: 'pops',
dateStrings: 'true',
multipleStatements: 'true'
});
// Connect to MySQL (if there is an error, report it and terminate the request)
connection.connect (function (err) {
// connected! (unless `err` is set)
if (err !== null)
{
console.log('Error '+err.code);
}
else
{
console.log('Connection to database successful!');
}
});
connection.query("SELECT sleep(10);", function(err, rows) {
// There was a error or not?
if (err !== null)
{
console.log("Query Rrror:" + err);
}
else
{
// Shows the result on console window
console.log("called after 10 seconds");
}
});
connection.query("SELECT * FROM team", function(error, result) {
// There was a error or not?
if (error !== null)
{
console.log("Query Rrror:" + error);
}
else
{
// Shows the result on console window
response.writeHead(200, {"Content-Type": "text/html"});
length = result.length - 1;
for(var i = 0; i <= length; i++)
{
row_obj = result[i];
team_id = row_obj.id;
team_name = row_obj.team_name;
team_color = row_obj.color;
created_at = row_obj.created_at;
response.write('Team ID: ' + team_id + '<br />');
response.write('Team Name: ' + team_name + '<br />');
response.write('Team Color: ' + team_color + '<br />');
response.write('Creation Date: ' + created_at + '<br />');
response.write('<br /><br />');
}
response.end("OK");
}
});
// Close connection
connection.end();
}).listen(8080, "127.0.0.1");

First, you should create the mysql connection outside the httpRequest handler.
And yes, Node.JS will execute both queries without waiting, but what I think that is happening, is that node-mysql is queuing the query.