我的Rails代码如何分辨它是运行在服务器（例如瘦服务器）还是rspec中？

Question

It turns out that the thin server is very particular about starting the EventMachine reactor for itself. That would be fine except that there are circumstances where I need to start the reactor because the process is not being run inside of thin.

So the simple question is how can I programatically determine that my Rails application is being started by a thin server? In that case I won't start my own EventMachine reactor, otherwise I have to.

Answer 1

After walking through both Rails and Thin initialization, it appears that there really is no penetration into the Application instance from Thin::Server . That seems to mean that I can't examine my app in order to see the server running it.

So I simply opted to check whether Thin::Server was defined. Since I have thin loaded with:

gem 'thin', require: false

I'm only going to have the Thin::Server class initialized if the application is being started from thin. I've checked the rails console, rake tasks and delayed_jobs workers and the assumption seems to hold.

So, in my application.rb:

# Start Faye...
config.middleware.delete Rack::Lock

thin_server = defined?(Thin::Server)

config.after_initialize do |app|
  Faye.logger = Rails.logger

  unless thin_server
    Faye.logger.debug "Ensure reactor running!"
    Faye.ensure_reactor_running!
  end
end

faye_params = {mount: '/faye', timeout: 25}
faye_params[:server] = 'thin' if thin_server

config.middleware.use FayeRails::Middleware, faye_params