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server.js
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server.js
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var express = require('express');
var app = express();
var server = require('http').Server(app);
var client = require('socket.io')(server).sockets;
var path = require('path');
var ip = require('ip');
//const { Db } = require('mongodb');
//const { dirname } = require('path');
var mongo = require('mongodb').MongoClient;
var port= process.env.PORT || '8080' ;
//connect to mongo
mongo.connect(process.env.MONGODB_URI || 'mongodb://localhost:27017/chatdb' ,function(err,db){
if(err){
throw err;
}
console.log('MongoDB Connected.');
//var db =client.db('chatdb')
//connect to socket.io
client.on('connection',function(socket){
console.log('A new user is connected.')
let chat = db.collection('chats');
//create function to send status
SendStatus = function(s){
socket.emit('status', s)
}
//get chats from mongo collection
chat.find().limit(100).sort({_id: 1}).toArray(function(err,res){
if(err){
throw(err);
}
//emit the messages
socket.emit('output',res);
})
//handle input event
socket.on('input',function(data){
let name = data.name;
let message = data.message;
//check for name and message
if(name==''|| message ==''){
//send Error status
SendStatus('Please enter a name and message.')
}else{
//insert messages
chat.insert({name: name, message: message}, function(){
client.emit('output',[data]);
//send status objects
SendStatus({
message: "Message sent",
clear: true
})
})
}
})
//Handle clear
socket.on('clear', function(data){
//remove all chats from collection
chat.remove({},function(){
socket.emit('cleared');
})
})
socket.on('disconnect',function(){
console.log('A user is disconnected.')
})
})
})
app.get('/', function(req,res){
res.sendfile('index.html');
})
server.listen(port,function(){
console.log('The server is listening at http://' + ip.address()+":"+ port);
})