Wrapper of Ruby gem lastfm for tolerant requests with 3 tries used at http://volontari.at/music

example.rb

class MusicArtist < ActiveRecord::Base
  include LastfmRequest
end

lastfm = Lastfm.new(LastfmApiKey, LastfmApiSecret)

# Simplest option
lastfm_artist = artist.lastfm_request(lastfm, :artist, :get_info, 'The artist you supplied could not be found', artist: 'Dummy')

# Option raise_if_response_is_just_nil
begin
  lastfm_artist_tags = lastfm_request(
    lastfm, :artist, :get_top_tags, 'The artist you supplied could not be found', artist: 'Dummy', raise_if_response_is_just_nil: true
  )
rescue StandardError => e
  if e.message.match('last.fm response is just nil without exceptions')
    # your exception handling code here
  else
    raise e
  end 
end

# Option raise_parse_exception
begin
  lastfm_albums = MusicArtist.lastfm_request_class_method(
    lastfm, :user, :get_top_albums, nil, user: 'Dummy', period: '12month', page: 1, raise_parse_exception: true
  )
rescue REXML::ParseException
  # your exception handling code here
end

lastfm_request.rb

module LastfmRequest
  def self.included(base)
    base.extend ClassMethods
  end
  
  def lastfm_request(lastfm, resource, method, error_message_reqexp, params = {})
    self.class.lastfm_request_class_method(lastfm, resource, method, error_message_reqexp, params)
  end

  module ClassMethods
    def lastfm_request_class_method(lastfm, resource, method, error_message_reqexp, params = {})
      response = nil
      raise_if_response_is_just_nil = params.delete(:raise_if_response_is_just_nil)
      raise_parse_exception = params.delete(:raise_parse_exception)
      
      i = 1
        
      3.times do
        begin
          response = lastfm.send(resource).send(method, params)
          
          raise 'last.fm response is just nil without exceptions' if response.nil? && raise_if_response_is_just_nil
          
          break
        rescue Timeout::Error, EOFError => e 
          puts "lastfm: #{e.class.name} for ##{i} time"
          sleep 60 
        rescue ArgumentError => e
          if e.message.match('File does not exist')
            puts "lastfm: 'File does not exist' sleep 60 seconds for ##{i} time ..."
            sleep 60
          else
            raise e
          end
        rescue Lastfm::ApiError => e
          if error_message_reqexp.nil? || e.message.match(error_message_reqexp).nil?
            if e.message.match(/Operation failed - Something else went wrong/)
              puts "lastfm: operation failed - something else went wrong for ##{i} time ..."
              sleep 60
            else
              raise e
            end
          end
        rescue REXML::ParseException => e
          raise e if raise_parse_exception
        end
        
        i += 1
      end
      
      response
    end
  end
end