Class: Mbeditor::Engine

Inherits:
Rails::Engine
  • Object
show all
Defined in:
lib/mbeditor/engine.rb

Class Method Summary collapse

Class Method Details

.subscribe_to_exceptions ⇒ Object

Records controller exceptions into ExceptionLog and pushes them to any open editor over the existing cable channel.

process_action.action_controller rather than a Rack middleware: ActionDispatch::DebugExceptions rescues and renders the error, so nothing outside it ever sees the raise. Rails.error.subscribe would be a cleaner API but only carries unhandled request errors reliably on newer Rails, and this gem supports 7.1.



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# File 'lib/mbeditor/engine.rb', line 154

def self.subscribe_to_exceptions
  return if @exception_subscriber

  @exception_subscriber = ActiveSupport::Notifications.subscribe(
    "process_action.action_controller"
  ) do |*args|
    payload = ActiveSupport::Notifications::Event.new(*args).payload
    exception = payload[:exception_object]
    next unless exception

    entry = Mbeditor::ExceptionLog.record(
      exception, payload,
      workspace_root: Mbeditor::WorkspaceRootResolver.call
    )
    next unless entry && defined?(ActionCable.server)

    ActionCable.server.broadcast("mbeditor_editor", entry)
  rescue StandardError => e
    # A monitoring hook must never be able to break the request it observes.
    Rails.logger.debug("[mbeditor] exception capture failed: #{e.class}: #{e.message}")
  end
end