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Simple Chat Application using the Sinatra Streaming API
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| # coding: utf-8 | |
| require 'sinatra' | |
| set server: 'thin', connections: [] | |
| get '/' do | |
| halt erb(:login) unless params[:user] | |
| erb :chat, locals: { user: params[:user].gsub(/\W/, '') } | |
| end | |
| get '/stream', provides: 'text/event-stream' do | |
| stream :keep_open do |out| | |
| settings.connections << out | |
| out.callback { settings.connections.delete(out) } | |
| end | |
| end | |
| post '/' do | |
| settings.connections.each { |out| out << "data: #{params[:msg]}\n\n" } | |
| 204 # response without entity body | |
| end | |
| __END__ | |
| @@ layout | |
| <html> | |
| <head> | |
| <title>Super Simple Chat with Sinatra</title> | |
| <meta charset="utf-8" /> | |
| <script src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script> | |
| </head> | |
| <body><%= yield %></body> | |
| </html> | |
| @@ login | |
| <form action='/'> | |
| <label for='user'>User Name:</label> | |
| <input name='user' value='' /> | |
| <input type='submit' value="GO!" /> | |
| </form> | |
| @@ chat | |
| <pre id='chat'></pre> | |
| <script> | |
| // reading | |
| var es = new EventSource('/stream'); | |
| es.onmessage = function(e) { $('#chat').append(e.data + "\n") }; | |
| // writing | |
| $("form").live("submit", function(e) { | |
| $.post('/', {msg: "<%= user %>: " + $('#msg').val()}); | |
| $('#msg').val(''); $('#msg').focus(); | |
| e.preventDefault(); | |
| }); | |
| </script> | |
| <form> | |
| <input id='msg' placeholder='type message here...' /> | |
| </form> | |
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