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server.js
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server.js
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var app = require('express')();
var http = require('http').Server(app);
var io = require('socket.io')(http);
var log = {
'info': function(text){
console.log(text);
}
};
var ChannelManager = (function(){
var channels = {
'General': []
};
return {
'addMessage': function(msgData){
channels[msgData.channel].push(msgData);
},
'addChannel': function(channelName){
if (channelName in channels){
throw "channel " + channelName + " already exists";
}
channels[channelName] = [];
},
'generateSystemMessage': function(msg){
return JSON.stringify({
'username': 'system',
'date_recieved': Date.now(),
'message': msg
});
},
'getChannel': function(channelName){
if (!(channelName in channels)){
return [];
}
return channels[channelName];
}
}
})();
/******************* http handlers ********************/
app.get('/', function(request, response){
response.sendFile(__dirname + '/index.html');
});
app.get('/client.js', function(request, response) {
response.sendFile(__dirname + '/client.js');
});
/******************* socket handlers ********************/
io.on('connection', function(socket) {
var username = 'lurker';
socket.broadcast.emit('chat', ChannelManager.generateSystemMessage('beware! a lurker has joined!'));
console.log('a user connected');
var existingMsgs = ChannelManager.getChannel('General');
for (var i = 0; i < existingMsgs.length; i++){
//sending old chat messages to new client
socket.emit('chat', JSON.stringify(existingMsgs[i]));
}
socket.on('disconnect', function() {
console.log('user disconnected');
socket.broadcast.emit('chat', ChannelManager.generateSystemMessage(username + ' has logged off'))
});
socket.on('chat', function(data){
var msgData = JSON.parse(data);
if (!msgData['username']) {
//Do nothing
return;
}
if (username != msgData['username']){
var sysMsg = 'a lurker has identified themselves as ' + msgData['username'];
if (username != 'lurker'){
sysMsg = username + " changed their user name to " + msgData['username'];
}
socket.broadcast.emit('chat', ChannelManager.generateSystemMessage(sysMsg));
username = msgData['username'];
}
msgData['date_recieved'] = Date.now();
ChannelManager.addMessage(msgData);
console.log('chat recieved: ' + data);
//sending to all
io.emit('chat', JSON.stringify(msgData));
});
//tracking if the user is typing or not
socket.on('meta:typing', function(data){
console.log('recieved typing notiifcation: ' + data);
//metadata includes user who is or is not typing
// looks like {'username': 'blah', 'isTyping': false}
//only telling other sockets
socket.broadcast.emit('meta:typing', data);
});
});
// could 9 ide configuration settings (e.g: process.env.PORT)
// if not running in cloud 9 then
var port = process.env.PORT;
if (port === undefined){
console.log('self hosting, using standard 8080');
port = 8080;
}else{
console.log('Cloud9 hosting, using port ' + port);
}
http.listen(port, function(){
console.log('listening on *:' + port);
});