Middleware(features) support

[icyleaf]

• middlewares(features) support with #use
  • request/response handler
  • interceptor
• Refactoring #logger to middleware

Features

Usage:

Halite.use("logger").get "https://httpbin.org/get"
Halite.use("logger", format: "json").get "https://httpbin.org/get"
Halite.use("logger", logger: Logger.new).get "https://httpbin.org/get"

Design:

abstract class Feature
  def initialize(**options)
  end

  # Cooks with request
  def request(request : Request) : Request
    request
  end

  # Cooking with response
  def response(response : Response) : Response
    response
  end

  # Interceptor
  #
  # Intercept and cooking request and response
  def intercept(chain : Interceptor::Chain) : Interceptor::Chain
    chain
  end
end

Logger

Keep #logger in Chainable methods.

PRs

#31, #32, #36