Created
February 17, 2022 07:11
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Use Ruby's SimpleDelegator to implement middleware
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| # frozen_string_literal: true | |
| require 'delegate' | |
| require 'json' | |
| class Middleware < SimpleDelegator | |
| end | |
| class CacheMiddleware < Middleware | |
| def initialize(object) | |
| super | |
| @cache = {} | |
| end | |
| def call(*args, **params) | |
| endpoint, = args | |
| return @cache[endpoint] if @cache[endpoint] | |
| super | |
| end | |
| end | |
| class RetryMiddleware < Middleware | |
| def call(*args, **params) | |
| retry_count = 0 | |
| begin | |
| super | |
| rescue StandardError | |
| raise if retry_count >= 3 | |
| retry_count += 1 | |
| retry | |
| end | |
| end | |
| end | |
| class Client | |
| def now_time | |
| call('/now_time') | |
| end | |
| def call(*_args, **_params) | |
| # Fake API Response | |
| { timestamp: Time.now.to_i }.to_json | |
| end | |
| end | |
| client = [CacheMiddleware, RetryMiddleware].reduce(Client.new) do |client, middleware| | |
| middleware.new(client) | |
| end | |
| puts client.now_time | |
| # Cached | |
| puts client.now_time |
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