Module | Sinatra::Async |
In: |
lib/sinatra/async.rb
|
Normally Sinatra expects that the completion of a request is # determined by the block exiting, and returning a value for the body.
In an async environment, we want to tell the webserver that we‘re not going to provide a response now, but some time in the future.
The a* methods provide a method for doing this, by informing the server of our asynchronous intent, and then scheduling our action code (your block) as the next thing to be invoked by the server.
This code can then do a number of things, including waiting (asynchronously) for external servers, services, and whatnot to complete. When ready to send the real response, simply setup your environment as you normally would for sinatra (using content_type, headers, etc). Finally, you complete your response body by calling the body method. This will push your body into the response object, and call out to the server to actually send that data.
require 'sinatra/async' class AsyncTest < Sinatra::Base register Sinatra::Async aget '/' do body "hello async" end aget '/delay/:n' do |n| EM.add_timer(n.to_i) { body { "delayed for #{n} seconds" } } end end