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server.js
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server.js
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const mongo = require('mongodb').MongoClient;
const client = require('socket.io').listen(4000).sockets;
// Connect to mongo
mongo.connect('mongodb://127.0.0.1/mongochat', {useNewUrlParser: true}, (err, db) => {
if (err) {
console.log(err);
throw err;
}
console.log('MongoDB connected...');
// Connect to Socket.io
client.on('connection', socket => {
// Create function to send status
sendStatus = function(s) {
socket.emit('status', s);
}
let chat = db.collection('chats');
// Get chats from mongo collection
chat.find().limit(100).sort({_id:1}).toArray(function (err, res) {
if (err) {
console.log(err);
throw err;
}
// Emit the messages
socket.emit('output', res);
});
// Handle input events
socket.on('input', (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 a message');
} else {
// Insert message
chat.insert({name: name, message: message}, () => {
client.emit('output', [data]);
// Send status object
sendStatus ({
message: 'Message sent',
clear: true
});
});
}
});
// Handle clear
socket.on('clear', (data) => {
// Remove all chats from collection
chat.remove({}, () => {
socket.emit('cleared');
})
})
})
});