Grape Middlewares

api_logger.rb

class APILogger < Grape::Middleware::Base
  
  def before
    request_method = env['REQUEST_METHOD']

    Rails.logger.info "REQUEST METHOD:\t#{request_method}"
    Rails.logger.info "REQUEST PATH:\t#{env['REQUEST_PATH']}"
    Rails.logger.info "QUERY STRING:\t#{env['QUERY_STRING']}"
    Rails.logger.info "POST PARAMS:\t#{env['rack.request.form_hash']}" if request_method == 'POST'
  end
end

error_handler.rb

class ErrorHandler < Grape::Middleware::Base

  def call!(env)

    # capture env
    @env = env

    begin

      # make api call
      @app.call @env

    rescue => e
	
      Rails.logger.error "API ERROR: #{e.message}"
      Rails.logger.error "API ERROR: #{e.backtrace.join("\n\t")}"

      # rescue from uncaught exceptions
      catch_error e
    end
  end

  private
  def catch_error(e)

    response = {
      response_code: 500,
      response_text: 'Internal Server Error',
      error_code: '500',
      error_text: e.message
    }

    [ 500, { 'Content-Type' => 'application/json' }, [ response.to_json ] ]
  end
end