actioncable/lib/action_cable/process/logging.rb


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require 'action_cable/server'
require 'eventmachine'
require 'celluloid'

EM.error_handler do |e|
  puts "Error raised inside the event loop: #{e.message}"
  puts e.backtrace.join("\n")
end

Celluloid.logger = ActionCable.server.logger

ActionCable.server.config.log_to_stdout if Rails.env.development?