Getting Sinatra to run alongside other threads in an app.

server.rb

require 'socket'
require 'sinatra/base'
require 'pry'

puts "Ruby runtime parsing SinatraServer in main thread: #{Thread.current}"

sinatra_thread = Thread.new do
  class SinatraServer < Sinatra::Application

    puts "Sinatra running in thread: #{Thread.current}"

    class << self
      attr_reader :sinatra_thread
    end

    get '/hi' do
      "Hello World!"
    end

    get '/exit' do
      exit!(0)
    end

    run!
  end
end


# Test this with the following client code:
# require 'socket'
# s = UDPSocket.new
# s.send("hello", 0, 'localhost', 1234)

class UdpServer
  def initialize
    @socket = UDPSocket.new
    @socket.bind(nil, 1234)
  end

  def serve
    loop do
      puts "Waiting for UDP message..."
      text, sender = @socket.recvfrom(16)
      puts "Got message: #{text}"
    end
  end

end



udp_thread = Thread.new { UdpServer.new.serve }
puts "created threads..."

# It never gets past here, but that makes sense, because
# neither loop terminates.
threads = [sinatra_thread, udp_thread]
threads.each { |thread| thread.join }
puts "threads joined"

Does it still work?

Sinatra didn't work for me, made it work with a pure ruby "server" for now.

https://github.com/icetiger-tec/eezee-cd7e7d338253f303aeb0b80059ce5905/blob/master/eezee.rb#L1063

Sinatra in a thread is still working unless you are using (as I suppose) @socket.recvfrom that block everything in each threads (because GIL).
I've got the same (bad) behavior when tries @redis.brpoplpush.