一個 controller 的 action 需要去戳外部 api 三次的邏輯需求

multiple_api_request_in_a_action_example.rb

class Webhook::CustomersController
  # 下列的 action 會有三個步驟，每個步驟都會戳一次 api 然後檢查結果，如果失敗就要 render 結果並退出，成功的話就把資料繼續丟下去給後面的邏輯做  
  # 這樣的寫法很直覺的流水帳寫下去，但容易把邏輯弄得很肥大，也許之後會難以閱讀
  # 然後思考一下發現裡面其實有某種邏輯的循環，但因為下一輪的循環依賴於前者，無法事先知道，所以嘗試使用 fiber 來處理
  # 可參考版本：https://gist.github.com/noel9999/172946f174e144c2d48e33535fc5d376
  def create
    token = get_access_token(params[:merchant_id])
    client = OpenApiClient.set(access_token: token).customers
    customer = client.get("/#{params[:resource][:_id]}").json_body
    mobile_phone, confirmed_at = customer.symbolize_keys.values_at(:mobile_phone, :confirmed_at)
    (head :no_content and return) unless [mobile_phone, confirmed_at].all?(&:present?)
    res = query_studioa_vip(mobile_phone)
    (render json: res.json_body, status: :bad_request and return) if res['RESULT']['STATUS'].to_s != 'S'
    result = if res.json_body['RESULT']['COUNT'].to_i > 0
      UpdateCustomerService.new(token: token, raw_customer: res.json_body['DATA'], customer: customer).execute
    else
      CreateCustomerService.new(customer: customer).execute
    end
    if result.success?
      render json: result.as_json, status: :ok
    else
      render json: result.as_json, status: :bad_request
    end
  end

  protected

  def query_studioa_vip(mobile_phone)
    uri = URI(Settings.api_endpoint.query_vip)
    json_parameters = {
      "SYSPARAM": {
        "DB_ID": "EPB",
        "CHAR_SET": "eng",
        "INCLUDE_NULL": "N"
      },
      "PARAMETER": {
        "VIP_PHONE": mobile_phone
      }
    }
    req = Net::HTTP::Post.new(uri, 'Content-Type' => 'application/json')
    req.body = json_parameters.to_json
    Net::HTTP.start(uri.hostname, uri.port) do |http|
      http.request(req)
    end
  end
end