em-websocket send() send from one client to another through 2 servers - ruby-on-rails

Question

I have two websocket clients, and I want to exchange information between them.
Let's say I have two instances of socket servers, and 1st is retrieve private information, filter it and send to the second one.
require 'em-websocket'
EM.run do
EM::WebSocket.run(host: '0.0.0.0', port: 19108) do |manager_emulator|
# retrieve information. After that I need to send it to another port (9108)
end
EM::WebSocket.run(host: '0.0.0.0', port: 9108) do |fake_manager|
# I need to send filtered information here
end
end
I've tried to do something, but I got usual dark code and I don't know how to implement this functionality.

Answer 1

I'm not sure how you would do that using EM.
I'm assuming you will need to have the fake_manager listen to an event triggered by the manager_emulator.
It would be quite easy if you'd be using a websocket web-app framework. For instance, on the Plezi web-app framework you could write something like this:
# try the example from your terminal.
# use http://www.websocket.org/echo.html in two different browsers to observe:
#
# Window 1: http://localhost:3000/manager
# Window 2: http://localhost:3000/fake
require 'plezi'
class Manager_Controller
def on_message data
FakeManager_Controller.broadcast :_send, "Hi, fake! Please do something with: #{data}\r\n- from Manager."
true
end
def _send message
response << message
end
end
class FakeManager_Controller
def on_message data
Manager_Controller.broadcast :_send, "Hi, manager! This is yours: #{data}\r\n- from Fake."
true
end
def _send message
response << message
end
end
class HomeController
def index
"use http://www.websocket.org/echo.html in two different browsers to observe this demo in action:\r\n" +
"Window 1: http://localhost:3000/manager\r\nWindow 2: http://localhost:3000/fake\r\n"
end
end
# # optional Redis URL: automatic broadcasting across processes or machines:
# ENV['PL_REDIS_URL'] = "redis://username:password#my.host:6379"
# starts listening with default settings, on port 3000
listen
# Setup routes:
# They are automatically converted to the RESTful route: '/path/(:id)'
route '/manager', Manager_Controller
route '/fake', FakeManager_Controller
route '/', HomeController
# exit terminal to start server
exit
Good Luck!
P.S.
If you're going to keep to EM, you might consider using Redis to push and subscribe to events between the two ports.

Answer 2

I've found a way how to do it through em-websocket gem! You need just define variables outside of eventmachine block. Something like that
require 'em-websocket'
message_sender = nil
EM.run do
# message sender
EM::WebSocket.run(host: '0.0.0.0', port: 19108) do |ws|
ws.onopen { message_sender = ws }
ws.onclose { message_sender = nil }
end
# message receiver
EM::WebSocket.run(host: '0.0.0.0', port: 9108) do |ws|
ws.onmessage { |msg| message_sender.send(msg) if message_sender }
end
end