SSE server with Goliath server in HTML5

In this article I have describe about Goliath server.
  • 1908

What is HTML5 Server-Sent Events

  • When a web page updates automatically from a server, it is a server-sent event.
  • The web page would have to ask if any updates were available in server-sent events.
  • The SSE servers can start data transmission for client, and send a message update.
  • Facebook/Twitter updates, stock price updates, news feeds, sport results, etc.

SSE server with Goliath

  • SSE server is simply use Goliath in this article and its make server implementa
  • A WebSocket service we will likely need an entirely different backend.
  • SSE endpoint can be implemented  by any HTTP web server.

Example

 

require 'goliath'

 

class EventGenerator < Goliath::API

  def response(env)

    EM.add_periodic_timer(1) { env.stream_send("data:hello ##{rand(100)}\n\n") }

    EM.add_periodic_timer(3) do

      env.stream_send(["event:signup", "data:signup event ##{rand(100)}\n\n"].join("\n"))

    end

 

    streaming_response(200, {'Content-Type' => 'text/event-stream'})

  end

end

 

class SSE < Goliath::API

  use Rack::Static, :urls => ["/index.html"], :root => Goliath::Application.app_path("public")

 

  get "/events" do

    run EventGenerator.new

  end

end

 

Define the code

  • Goliath server to send request to event by returning a (Some no.) ok response.
  • Then SSE Goliath starts emitting newline delimited message for each second.
  • SSE Goliath is streaming directly into the HTTP connection. 
  • Goliath server is a static index file.
  • SSE Goliath is open eventsource connection in HTML5.

Further Readings

You may also want to read these related articles :

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