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I have been using Sinatra for sometime now and I would like to add some realtime features to my web-app by pushing the data via websockets.
I have successfully used the gem 'em-websocket' on its own, but have not been able to write one ruby file that has a sinatra web server AND a web-socket server.
I've tried spinning the run! or start! methods off in separate threads with no success.
Has anyone gotten this to work?
I want to have them in the same file as I can then share variables between the two servers.
Thanks!
553
Did not try it, but should not be too hard:
require 'em-websocket'
require 'sinatra/base'
require 'thin'
EM.run do
class App < Sinatra::Base
# Sinatra code here
end
EM::WebSocket.start(:host => '0.0.0.0', :port => 3001) do
# Websocket code here
end
# You could also use Rainbows! instead of Thin.
# Any EM based Rack handler should do.
Thin::Server.start App, '0.0.0.0', 3000
end
Also, Cramp has a websocket implementation that works directly with Thin/Rainbows! you might be able to extract, so you won't even need to run the server on another port.
106
Thanks Konstantin... that worked! I had to tweak your code slightly. I added comments where I changed it.
-poul
require 'rubygems' # <-- Added this require
require 'em-websocket'
require 'sinatra/base'
require 'thin'
EventMachine.run do # <-- Changed EM to EventMachine
class App < Sinatra::Base
get '/' do
return "foo"
end
end
EventMachine::WebSocket.start(:host => '0.0.0.0', :port => 8080) do |ws| # <-- Added |ws|
# Websocket code here
ws.onopen {
ws.send "connected!!!!"
}
ws.onmessage { |msg|
puts "got message #{msg}"
}
ws.onclose {
ws.send "WebSocket closed"
}
end
# You could also use Rainbows! instead of Thin.
# Any EM based Rack handler should do.
App.run!({:port => 3000}) # <-- Changed this line from Thin.start to App.run!
end
I stumbled onto this websocket-rack github project which is basically a rackified em-websocket and actually got it to work nicely side-by-side with a Sinatra app. Here's my config.ru:
require 'rubygems'
require 'rack/websocket'
require 'sinatra/base'
class WebSocketApp < Rack::WebSocket::Application
# ...
end
class SinatraApp < Sinatra::Base
# ...
end
map '/ws' do
run WebSocketApp.new
end
map '/' do
run SinatraApp
end
Have fun!
Colin
17
I've been using sinatra-websocket. It let's you run the websocket server in the same process and on the same port as Sinatra.
Disclaimer: I'm the maintainer.
require 'sinatra'
require 'sinatra-websocket'
set :server, 'thin'
set :sockets, []
get '/' do
if !request.websocket?
erb :index
else
request.websocket do |ws|
ws.onopen do
ws.send("Hello World!")
settings.sockets << ws
end
ws.onmessage do |msg|
EM.next_tick { settings.sockets.each{|s| s.send(msg) } }
end
ws.onclose do
warn("websocket closed")
settings.sockets.delete(ws)
end
end
end
end
__END__
@@ index
<html>
<body>
<h1>Simple Echo & Chat Server</h1>
<form id="form">
<input type="text" id="input" value="send a message"></input>
</form>
<div id="msgs"></div>
</body>
<script type="text/javascript">
window.onload = function(){
(function(){
var show = function(el){
return function(msg){ el.innerHTML = msg + '<br />' + el.innerHTML; }
}(document.getElementById('msgs'));
var ws = new WebSocket('ws://' + window.location.host + window.location.pathname);
ws.onopen = function() { show('websocket opened'); };
ws.onclose = function() { show('websocket closed'); }
ws.onmessage = function(m) { show('websocket message: ' + m.data); };
var sender = function(f){
var input = document.getElementById('input');
input.onclick = function(){ input.value = "" };
f.onsubmit = function(){
ws.send(input.value);
input.value = "send a message";
return false;
}
}(document.getElementById('form'));
})();
}
</script>
</html>
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