kekshd/keks

# encoding: utf-8

module CacheTools
  def last_admin_or_reviewer_change
    t = Rails.cache.read_multi(
      :categories_last_update,
      :questions_last_update,
      :answers_last_update,
      :reviews_last_update,
      :hints_last_update
    )
    t.values.compact.max
  end

  def generate_cache_key(add = nil)
    c = if defined?(caller_locations)
      # Ruby 2.0+
      caller_locations(1,1)[0].label
    else
      # Ruby 1.9
      caller[0][/`([^']*)'/, 1]
    end

    [c, last_admin_or_reviewer_change, add].compact.join("__")
  end

  def etag(text = nil)
    # always bust browser cache in development mode so pages that can be
    # cached indefinitely in production mode get auto-reload support
    return Time.now.to_s if Rails.env.development?
    tag = []
    tag << GIT_REVISION if defined?(GIT_REVISION)
    tag << current_user.id if current_user
    tag << last_admin_or_reviewer_change
    tag << text unless text.blank?
    tag.join("_")
  end
end