ExternalResource

external_resource.rb

module ExternalResource
  # Adds ability to use view helpers, like number_to_currency.
  #   e.g. @@view_context.number_to_currency( 2.48 )
  @@view_context = ActionController::Base.new.view_context
  
  # # Handles timeout and other issues for blocks requesting external resources.
  # For example, when using nokogiri to scrape a site.
  # Requires a block with the HTTPClient.get call or what-have-you
  # 
  # @param [Hash] options Options for the timeout.
  # @option options [Integer] timeout (20) Number of seconds to wait before it times out.
  # @option options [String] attempts (10) Number of attempts before the resource is unreachable.
  #
  # @return [SystemTimer, False] SystemTimer if all goes well. Otherwise, returns false if it hits 
  #   the retry limit.
  #
  # @todo This might be better in a more generally accessible place. I could see Controllers taking 
  #   advantage of this.
  #
  def load_with_timeout( options = {} )
    options = { :timeout => 20, :attempts => 10 }.merge!(options)
    @attempts_remaining ||= options[:attempts]
    
    begin        
      @attempts_remaining -= 1
      
      output = SystemTimer.timeout_after( options[:timeout] ) do
        yield
      end
      
    rescue Timeout::Error
      tell "Timed out."
    rescue => e
      tell e
    ensure
      unless output 
        tell "#{@@view_context.pluralize( @attempts_remaining, "attempt" )} remaining."
        if @attempts_remaining <= 0 
          total_attempts = @@view_context.pluralize( options[:attempts], "attempt" )
          raise  "Unable to load after #{total_attempts}."
        else
          sleep 0.5 and retry
        end
      end
    end
  end
end

You're probably right, actually…. Good call.

…

On Thursday, 19 January, 2012 at 1:26 PM, Chuck Bergeron wrote: You have a todo: "put this in a more accessible place, possibly for controllers". Couldn't a controller access it if it's module ExternalResource;end; ? --- Reply to this email directly or view it on GitHub: https://gist.github.com/1641584