# File lib/fog/aws/requests/iam/list_roles.rb, line 41
        def list_roles(options={})
          limit  = options['MaxItems']
          marker = options['Marker']

          if limit
            if limit > 1_000
              raise Fog::AWS::IAM::Error.new(
                "ValidationError => 1 validation error detected: Value '#{limit}' at 'limit' failed to satisfy constraint: Member must have value less than or equal to 1000"
              )
            elsif limit <  1
              raise Fog::AWS::IAM::Error.new(
                "ValidationError => 1 validation error detected: Value '#{limit}' at 'limit' failed to satisfy constraint: Member must have value greater than or equal to 1"
              )
            end
          end

          data_set = if marker
                       self.data[:markers][marker] || []
                     else
                       data[:roles].map { |role, data|
                         {
                           'Arn'                      => data[:arn].strip,
                           'AssumeRolePolicyDocument' => Fog::JSON.encode(data[:assume_role_policy_document]),
                           'RoleId'                   => data[:role_id],
                           'Path'                     => data[:path],
                           'RoleName'                 => role,
                           'CreateDate'               => data[:create_date],
                         }
                       }
                     end

          data = data_set.slice!(0, limit || 100)
          truncated = data_set.size > 0
          marker = truncated && Base64.encode64("metadata/l/#{account_id}/#{UUID.uuid}")

          response = Excon::Response.new

          body = {
            'Roles'       => data,
            'IsTruncated' => truncated,
            'RequestId'   => Fog::AWS::Mock.request_id
          }

          if marker
            self.data[:markers][marker] = data_set
            body.merge!('Marker' => marker)
          end

          response.body = body
          response.status = 200

          response
        end