sinatra-sse

Sinatra support for server-sent events. The sinatra-sse gem needs a web server, which supports async operation. It is tested with thin.

gem install sinatra-sse

The timer example (in example/config.ru) sends time information over an SSE stream, like this:

require "sinatra/base"
require "sinatra/sse"

class TimeServer < Sinatra::Base
  include Sinatra::SSE

  get '/' do
    sse_stream do |out|
      EM.add_periodic_timer(1) do 
        out.push :event => "timer", :data => Time.now.to_s
      end
    end
  end
end

The SSE specs define the "text/event-stream" content type. Conforming clients send these in the "Accept:" header, and conforming servers set the "Content-Type:" header accordingly.

1.9.2 ~/sinatra-sse/lib[master] > curl -s -H "Accept: text/event-stream" http://0.0.0.0:9292
event: timer
data: 2012-10-21 11:21:48 +0200

event: timer
data: 2012-10-21 11:21:49 +0200

The sinatra-sse gem is (c) radiospiel, 2012; it is distributed under the terms of the Modified BSD License, see LICENSE.BSD for details.