Tell us what’s happening:
I get a weird error saying
MongooseError: Operation shorturls.findOne() buffering timed out after 10000ms
at Timeout. (/home/runner/boilerplate-project-urlshortener/node_modules/mongoose/lib/drivers/node-mongodb-native/collection.js:185:20)
at listOnTimeout (internal/timers.js:554:17)
at processTimers (internal/timers.js:497:7)
whenever I read use the function find().then(), I tried to use count instead of find, using async and await, uninstalling and reinstalling mongoose. I made sure that the database is connected too but still get the error. What would you recommend for me to do?
Code
'use strict';
require('dotenv').config();
const express = require('express');
const cors = require('cors');
const dns = require('dns');
const mongoose = require('mongoose');
var {MongoClient} = require('mongodb');
const bodyParser = require('body-parser');
const app = express();
// Basic Configuration
const port = process.env.PORT || 3000;
const uri = process.env['MONGO_KEY'];
const client = new MongoClient(
uri, {
useUnifiedTopology: true
});
client.connect()
.then(
() => console.log('success connecting to database'))
.catch(
(err) => console.log(err + '\n' + "fialed to connect to database"));
const regexURL = /^(?:(?:(?:https?|ftp):)?\/\/)(?:\S+(?::\S*)?@)?(?:(?!(?:10|127)(?:\.\d{1,3}){3})(?!(?:169\.254|192\.168)(?:\.\d{1,3}){2})(?!172\.(?:1[6-9]|2\d|3[0-1])(?:\.\d{1,3}){2})(?:[1-9]\d?|1\d\d|2[01]\d|22[0-3])(?:\.(?:1?\d{1,2}|2[0-4]\d|25[0-5])){2}(?:\.(?:[1-9]\d?|1\d\d|2[0-4]\d|25[0-4]))|(?:(?:[a-z\u00a1-\uffff0-9]-*)*[a-z\u00a1-\uffff0-9]+)(?:\.(?:[a-z\u00a1-\uffff0-9]-*)*[a-z\u00a1-\uffff0-9]+)*(?:\.(?:[a-z\u00a1-\uffff]{2,})))(?::\d{2,5})?(?:[/?#]\S*)?$/i;
const shortUrlScheme = new mongoose.Schema({
original_url: String,
short_url: Number
});
const ShortUrl = mongoose.model('ShortUrl', shortUrlScheme);
app.use(cors());
app.use(bodyParser.urlencoded({extended: false}));
app.use('/public', express.static(`${process.cwd()}/public`));
app.get('/', function(req, res) {
res.sendFile(process.cwd() + '/views/index.html');
});
// Your first API endpoint
app.get('/api/hello', function(req, res) {
res.json({ greeting: 'hello API' });
});
const isConnected = () => {
// used for debugging
return !!client &&
!!client.topology &&
client.topology.isConnected();
}
const findOneByURL = (url, done) => {
let flag = true;
console.log('starting search');
ShortUrl.findOne({original_url: url}, (err, data) => {
console.log(err);
if(err)
return done(err, null);
flag = false;
done(null, data);
});
console.log('finished search');
if(flag) done(null, null);
};
const findOneByShort = (url, done) => {
let flag = true;
ShortUrl.findOne({short_url: url}, (err, data) => {
if(err)
return done(err, null);
flag = false;
done(null, data);
});
if(flag) done(null, null);
};
const createAndSave = (url, done) => {
ShortUrl.find().then((err, data) => {
if(err)
return done(err, null);
console.log(data);
let short = new ShortUrl({
original_url: url,
short_url: data
});
short.save((err, data) => {
if(err)
return done(err, null);
let item = {
original_url: data.original_url,
short_url: data.short_url
};
done(null, item);
});
}).catch(
err => console.log('failed in create and save'));
};
const validateUrl = (value) => {
return regexURL.test(value);
}
const testUrl = (url, done) => {
if(validateUrl(url)) {
dns.lookup(url.replace(/^https?:\/\//i, ''),
(err, address, family) => {
if(err)
return done(err, null);
done(null, address);
});
}
else {
done({error: 'invalid url'}, url);
}
};
app.post('/api/shorturl/new', (req, res) => {
testUrl(req.body.url, (err, address) => {
if(err)
return res.json(err);
console.log('test succeeded');
findOneByURL(req.body.url, (err, data) => {
if(err)
return res.json(err);
if(data) {
console.log('URL Already exists')
let item = {
original_url: data.original_url,
short_url: data.short_url
};
res.json(item);
}
else {
console.log('to create new item')
createAndSave(req.body.url, (err, data) => {
if(err)
return res.json(err);
console.log('here');
res.json(data);
console.log('finished creating');
});
}
});
});
});
app.get('/api/shorturl/:shortUrl', (req, res) => {
findOneByShort(req.params.shortUrl, (err, data) => {
if(err)
res.json(err);
if(data) {
console.log('redirecting');
res.redirect(data.original_url);
}
else {
res.json({
error: 'invalid short URL'
});
}
});
});
app.listen(port, function() {
console.log(`Listening on port ${port}`);
});
Your project link(s)
solution: https://boilerplate-project-urlshortener.ahmedkhfagy.repl.co
githubLink: GitHub - aKhfagy/boilerplate-project-urlshortener: A boilerplate for a freeCodeCamp project.
Your browser information:
User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.72 Safari/537.36.
Challenge: URL Shortener Microservice