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How to fix MongoError: server instance pool was destroyed? [duplicate]

How do I return the response from an asynchronous call?How to properly reuse connection to Mongodb across NodeJs application and modulesmongoError: Topology was destroyedHow to resolve Mongoose Connect UNKNOWN?How to use Node http request globallyWhy does not sending data io.sockets.emit and socket.broadcast.emitAssertionError: null == MongoError: server instance pool was destroyed“Cannot GET /db/read/getall” accessing node.js express API using reverse proxy nginx on digitalocean dropletmongoose connection error alwaysMongoError “server instance pool was destroyed”MongoError: server instance pool was destroyedMongoClient throw MongoError: server instance pool was destroyed

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0

This question already has an answer here:

• 
  How do I return the response from an asynchronous call?
  
  34 answers
  
  


• 
  How to properly reuse connection to Mongodb across NodeJs application and modules
  
  11 answers
  
  

My objective is to simply insert a message into database from a form post.

I have tried the following code without using any framework.

const http = require('http');
const MongoClient = require('mongodb').MongoClient;
var qs = require('querystring');
var url = require('url');

const hostname = '127.0.0.1';
const port = 3000;
const uri = 'mongodb://localhost:27017';
const client = new MongoClient(uri, useNewUrlParser: true );
var messages = "";

const server = http.createServer((req,res) => 
 res.statusCode = 200;
 res.setHeader('Content-Type', 'text/html');
 res.write(`
 <!doctype html>
 <html>
 <body>
 <form action="/" method="post">
 <input type="text" name="message" />
 <button>Insert</button>
 </form>
 </body>
 </html>);
 if (req.method === 'POST') 
 var body = '';
 req.on('data', function (data) 
 body += data;
 );

 req.on('end', function () 
 var post = qs.parse(body);
 client.connect(err => 
 const collection = client.db("mydb").collection("messages");
 collection.insertOne(post, function(err, res) 
 if(err) throw err;
 console.log("1 document inserted");
 client.close(); // Either I place it here or don't close the connection at all still showing error
 )
 );
 );

 
);

server.listen(port, hostname, () => 
 console.log(`Server running at http://$hostname:$port/`);
);

Now when I run the app it constantly loading/requesting and after submitting a message its throwing error "MongoError: server instance pool was destroyed". Please assist me what is the proper way to achieve the goal or any workaround. Thanks.

node.js mongodb

share|improve this question

edited Mar 23 at 5:18

Hasan Al Khaled

asked Mar 23 at 4:50

Hasan Al KhaledHasan Al Khaled

65

marked as duplicate by Neil Lunn mongodb
Users with the  mongodb badge can single-handedly close mongodb questions as duplicates and reopen them as needed.

StackExchange.ready(function()
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$hover.hover(
function()
$hover.showInfoMessage('',
messageElement: $msg.clone().show(),
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position: my: 'bottom left', at: 'top center', offsetTop: -7 ,
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StackExchange.helpers.removeMessages();

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Mar 23 at 4:55

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  client.close() is being invoked "outside" of a callback when it needs to be "inside". In fact your code for a http server really should never call client.close() at all. Please look at the "first" linked duplicate for reference on callbacks and their relation to flow control in your application. Please also see the second linked duplicate for reference on how to handle connections properly within your application.
  
  – Neil Lunn
  Mar 23 at 4:56
  
  

  
  
  
  

add a comment | 

0

This question already has an answer here:

• 
  How do I return the response from an asynchronous call?
  
  34 answers
  
  


• 
  How to properly reuse connection to Mongodb across NodeJs application and modules
  
  11 answers
  
  

My objective is to simply insert a message into database from a form post.

I have tried the following code without using any framework.

const http = require('http');
const MongoClient = require('mongodb').MongoClient;
var qs = require('querystring');
var url = require('url');

const hostname = '127.0.0.1';
const port = 3000;
const uri = 'mongodb://localhost:27017';
const client = new MongoClient(uri, useNewUrlParser: true );
var messages = "";

const server = http.createServer((req,res) => 
 res.statusCode = 200;
 res.setHeader('Content-Type', 'text/html');
 res.write(`
 <!doctype html>
 <html>
 <body>
 <form action="/" method="post">
 <input type="text" name="message" />
 <button>Insert</button>
 </form>
 </body>
 </html>);
 if (req.method === 'POST') 
 var body = '';
 req.on('data', function (data) 
 body += data;
 );

 req.on('end', function () 
 var post = qs.parse(body);
 client.connect(err => 
 const collection = client.db("mydb").collection("messages");
 collection.insertOne(post, function(err, res) 
 if(err) throw err;
 console.log("1 document inserted");
 client.close(); // Either I place it here or don't close the connection at all still showing error
 )
 );
 );

 
);

server.listen(port, hostname, () => 
 console.log(`Server running at http://$hostname:$port/`);
);

Now when I run the app it constantly loading/requesting and after submitting a message its throwing error "MongoError: server instance pool was destroyed". Please assist me what is the proper way to achieve the goal or any workaround. Thanks.

node.js mongodb

share|improve this question

edited Mar 23 at 5:18

Hasan Al Khaled

asked Mar 23 at 4:50

Hasan Al KhaledHasan Al Khaled

65

marked as duplicate by Neil Lunn mongodb
Users with the  mongodb badge can single-handedly close mongodb questions as duplicates and reopen them as needed.

StackExchange.ready(function()
if (StackExchange.options.isMobile) return;

$('.dupe-hammer-message-hover:not(.hover-bound)').each(function()
var $hover = $(this).addClass('hover-bound'),
$msg = $hover.siblings('.dupe-hammer-message');

$hover.hover(
function()
$hover.showInfoMessage('',
messageElement: $msg.clone().show(),
transient: false,
position: my: 'bottom left', at: 'top center', offsetTop: -7 ,
dismissable: false,
relativeToBody: true
);
,
function()
StackExchange.helpers.removeMessages();

);
);
);
Mar 23 at 4:55

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  client.close() is being invoked "outside" of a callback when it needs to be "inside". In fact your code for a http server really should never call client.close() at all. Please look at the "first" linked duplicate for reference on callbacks and their relation to flow control in your application. Please also see the second linked duplicate for reference on how to handle connections properly within your application.
  
  – Neil Lunn
  Mar 23 at 4:56
  
  

  
  
  
  

add a comment | 

This question already has an answer here:

• 
  How do I return the response from an asynchronous call?
  
  34 answers
  
  


• 
  How to properly reuse connection to Mongodb across NodeJs application and modules
  
  11 answers
  
  

My objective is to simply insert a message into database from a form post.

I have tried the following code without using any framework.

const http = require('http');
const MongoClient = require('mongodb').MongoClient;
var qs = require('querystring');
var url = require('url');

const hostname = '127.0.0.1';
const port = 3000;
const uri = 'mongodb://localhost:27017';
const client = new MongoClient(uri, useNewUrlParser: true );
var messages = "";

const server = http.createServer((req,res) => 
 res.statusCode = 200;
 res.setHeader('Content-Type', 'text/html');
 res.write(`
 <!doctype html>
 <html>
 <body>
 <form action="/" method="post">
 <input type="text" name="message" />
 <button>Insert</button>
 </form>
 </body>
 </html>);
 if (req.method === 'POST') 
 var body = '';
 req.on('data', function (data) 
 body += data;
 );

 req.on('end', function () 
 var post = qs.parse(body);
 client.connect(err => 
 const collection = client.db("mydb").collection("messages");
 collection.insertOne(post, function(err, res) 
 if(err) throw err;
 console.log("1 document inserted");
 client.close(); // Either I place it here or don't close the connection at all still showing error
 )
 );
 );

 
);

server.listen(port, hostname, () => 
 console.log(`Server running at http://$hostname:$port/`);
);

Now when I run the app it constantly loading/requesting and after submitting a message its throwing error "MongoError: server instance pool was destroyed". Please assist me what is the proper way to achieve the goal or any workaround. Thanks.

node.js mongodb

share|improve this question

edited Mar 23 at 5:18

Hasan Al Khaled

asked Mar 23 at 4:50

Hasan Al KhaledHasan Al Khaled

65

const http = require('http');
const MongoClient = require('mongodb').MongoClient;
var qs = require('querystring');
var url = require('url');

const hostname = '127.0.0.1';
const port = 3000;
const uri = 'mongodb://localhost:27017';
const client = new MongoClient(uri, useNewUrlParser: true );
var messages = "";

const server = http.createServer((req,res) => 
 res.statusCode = 200;
 res.setHeader('Content-Type', 'text/html');
 res.write(`
 <!doctype html>
 <html>
 <body>
 <form action="/" method="post">
 <input type="text" name="message" />
 <button>Insert</button>
 </form>
 </body>
 </html>);
 if (req.method === 'POST') 
 var body = '';
 req.on('data', function (data) 
 body += data;
 );

 req.on('end', function () 
 var post = qs.parse(body);
 client.connect(err => 
 const collection = client.db("mydb").collection("messages");
 collection.insertOne(post, function(err, res) 
 if(err) throw err;
 console.log("1 document inserted");
 client.close(); // Either I place it here or don't close the connection at all still showing error
 )
 );
 );

 
);

server.listen(port, hostname, () => 
 console.log(`Server running at http://$hostname:$port/`);
);

share|improve this question

edited Mar 23 at 5:18

Hasan Al Khaled

asked Mar 23 at 4:50

Hasan Al KhaledHasan Al Khaled

65

share|improve this question

edited Mar 23 at 5:18

Hasan Al Khaled

asked Mar 23 at 4:50

Hasan Al KhaledHasan Al Khaled

65

asked Mar 23 at 4:50

Hasan Al KhaledHasan Al Khaled

65

asked Mar 23 at 4:50

Hasan Al KhaledHasan Al Khaled

65