How to access exception recipients after initialisation with exception notification gem?

Question

I want to be able to define the exception_recipients dynamically, based on the Rails environment. For example:

recipients = Rails.env == 'production'
   [email protected]
else
   User.current.email
end

However, from the docs:

Whatever::Application.config.middleware.use ExceptionNotification::Rack,
  :email => {
    :email_prefix => "[Whatever] ",
    :sender_address => %{"notifier" <[email protected]>},
    :exception_recipients => %w{[email protected]}
  }

In config/environments/production.rb where i don't have an ActiveRecord::Base connection yet.

How can I set the exceptions recipients after Rails has loaded?

Thanks

Answer 1

Custom Notifier

You can create a custom notifier, which inherits from the EmailNotifier, which will use User.current.email in the non-production environments.

# app/models/exception_notifier/custom_notifier.rb
#
module ExceptionNotifier
  class CustomNotifier < EmailNotifier

    def initialize(options)
      @fallback_exception_recipients = options[:fallback_exception_recipients]
      options[:exception_recipients] ||= options[:fallback_exception_recipients]
      super(options)
    end

    def call(exception, options = {})
      options[:exception_recipients] = [User.current.email] unless Rails.env.production?
      super(exception, options)
    end

  end
end

Initializer

The fallback address can, for example, be passed from the initializer.

# config/initializers/exception_notification.rb
#
Rails.application.config.middleware.use ExceptionNotification::Rack, {
  :custom => {
    :fallback_exception_recipients => %w{[email protected]},
    # ...
  }
}

current_user instead of User.current

I'm not sure whether your User.current call will work here. But, you pass the current_user to the exception data as shown in the README.

# app/controllers/application_controller.rb
#
class ApplicationController < ActionController::Base
  before_filter :prepare_exception_notifier
  private
  def prepare_exception_notifier
    request.env["exception_notifier.exception_data"] = {
      :current_user => current_user
    }
  end
end

Then, replace the above ExceptionNotifier::CustomNotifier#call method with this one:

# app/models/exception_notifier/custom_notifier.rb
#
module ExceptionNotifier
  class CustomNotifier < EmailNotifier

    # ...

    def call(exception, options = {})
      unless Rails.env.production?
        if current_user = options[:env]['exception_notifier.exception_data'][:current_user]
          options[:exception_recipients] = [current_user.email]
        end
      end
      super(exception, options)
    end

  end
end

Answer 2

This is not supported out of the box. You might be able to create your own custom notifier as described in the docs : https://github.com/smartinez87/exception_notification#custom-notifier

You can look at the built in EmailNotifier and potentially extend it and just override either the initialize or compose_email methods to make it do what you need.

https://github.com/smartinez87/exception_notification/blob/master/lib/exception_notifier/email_notifier.rb#L120

https://github.com/smartinez87/exception_notification/blob/master/lib/exception_notifier/email_notifier.rb#L90