Execute code once Sinatra server is running

Question

I have a Sinatra Application enclosed in Sinatra::Base and I\'d like to run some code once the server has started, how should I go about doing this?

Her

Answer 1

The only valid answer in stackoverflow to this question (which is asked 3-4 times) is given by levinalex on Start and call Ruby HTTP server in the same script, and I quote:

run! in current Sinatra versions takes a block that is called when the app is started.

Using that callback you can do this:

require 'thread'

def sinatra_run_wait(app, opts)
  queue = Queue.new
  thread = Thread.new do
    Thread.abort_on_exception = true
    app.run!(opts) do |server|
      queue.push("started")
    end
  end
  queue.pop # blocks until the run! callback runs
end

sinatra_run_wait(TestApp, :port => 3000, :server => 'webrick')

This seems to be reliable for WEBrick, but when using Thin the callback is still sometimes called a little bit before the server accepts connections.