DummyResponse with Faraday

dummy_response.rb

require 'bundler/setup'
Bundler.require

module Faraday
  class Dummy < Faraday::Middleware
    def call(env)
      if Random.new.rand(0..1) == 0
        @app.call(env).on_complete do |env|
          env
        end
      else
        dummy_response(env)
      end
    end

    private

    def dummy_response(env)
      puts 'dummy request =>'
      body = {
        dummy: "aaaaaaaaaaaaaaaaaaaaaaaaa"
      }.to_json

      env.update(
        status: 200,
        body:   body,
        response_headers: {
          'content-type' => 'application/json'
        }
      )
      Faraday::Response.new(env)
    end
  end
end

module Faraday
  class Logger < Faraday::Middleware
    def call(env)
      puts 'request =>'
      @app.call(env).on_complete do |env|
        env
      end
    end
  end
end

conn = Faraday.new(url: 'https://api.ipify.org') do |builder|
  builder.response :json
  builder.use Faraday::Dummy
  builder.use Faraday::Logger
  builder.adapter Faraday.default_adapter
end
res = conn.get '', {format: 'json'}

puts res.body