Kỳ 2: Design Pattern – Ứng dụng Adaptor Pattern xây dựng module thanh toán cho gian hàng
“Người ta không phát minh lại cái bánh xe”, bởi vì nó đã được người khác phát minh ra trước đó. Nhưng còn tệ hơn nữa khi chính bạn đã phát minh ra cái bánh xe và sau đó bạn tìm cách phát minh lại nó.
Trong lập trình, rất nhiều lúc bạn phải phát triển một tính năng nào đó cho một sản phẩm phần mềm, và thật may mắn, bạn phát hiện ra một cái tương tự như thế đã được bạn viết ra trước đây. Nhưng vấn đề là những đoạn mã trước đó bạn viết ra chỉ để phục vụ cho công việc của thời điểm đó, và bạn sẽ phải đổ rất nhiều mồ hôi để làm một loạt các thao tác: copy/cut/paste/delete/rename… để sử dụng chúng trong hoàn cảnh mới. Những lúc như vậy, bạn chỉ ước rằng trước đây mình chịu khó dùng cái đầu nhiều hơn một chút, module hóa chức năng đó tốt hơn một tí, code cẩn thận hơn một tẹo… để bây giờ đỡ hao tâm khổ tứ hơn nhiều lần. Design Pattern (tạm dịch là Mẫu thiết kế) trong lập trình chính là các giải pháp về thiết kế, tổ chức code cho từng tình huống, vấn đề khác nhau. Mỗi Design Pattern thường được đưa ra với một cặp “Problem” – “Solution” (Vấn đề – Giải pháp), và được gọi với một cái tên dùng gợi nhớ ý nghĩa của nó.
Trong bài này, chúng ta sẽ lướt qua một số mẫu design pattern phổ biến, sử dụng các kịch bản tình huống xây dựng một gian hàng trực tuyến để thấy rõ các vấn đề và giải pháp trong từng hoàn cảnh.
Ứng dụng Adaptor Pattern xây dựng module Thanh toán cho gian hàng
Chức năng quan trọng nhất mà mọi gian hàng cần phải xây dựng đó là module thanh toán. Hiện nay có rất nhiều giải pháp cho việc thanh toán trực tuyến, trong đó một vài cái tên quen tai như: Paypal, Liberty Reverse, Visa Card, Master Card, thậm chí là ATM. Thật tuyệt vời nếu chúng ta có thể xây dựng một chức năng thanh toán có thể cho phép người dùng lựa chọn bất cứ loại giao dịch nào thuận tiện nhất đối với họ. Chức năng này sẽ phải cài đặt từng module riêng rẽ cho mỗi loại phương thức giao dịch, nhưng chúng ta muốn module quản lý thanh toán sẽ nhìn từng module kia dưới một hình thức duy nhất, đó chính là lý thuyết Đa hình mà chúng ta đã tìm hiểu ở phần trước. Thật rối rắm! Nhưng bạn sẽ thấy nó rõ ràng hơn sau khi theo dõi các ví dụ được lấy ra từ một thư viện PHP Payment Library đã được xây dựng sẵn:
Trước hết chúng ta sẽ xây dựng một abstraction class, định nghĩa API cho các phương thức giao dịch được chấp nhận.
abstract class PaymentGateway
{
// Holds the last error encountered
public $lastError;
// Field array to submit to gateway
public $fields = array();
// Payment gateway URL
public $gatewayUrl;
// Initialization constructor
public function __construct()
{
// Some default values of the class
$this->lastError = '';
}
// Adds a key=>value pair to the fields array
public function addField($field, $value)
{
$this->fields["$field"] = $value;
}
// Submit Payment Request
public function submitPayment()
{
$this->prepareSubmit();
// POST form with some hidden elements to gateway
}
// Perform any pre-posting actions
protected function prepareSubmit()
{
// Fill if needed
}
/* Some IPN properties and functions definition */
}
Tất cả các phương thức giao dịch trực tuyến (Paypal, Authorize.net, 2Checkout…) đều thực hiện những tiến trình thanh toán chung như sau:
1 – Thiết đặt một số thông tin giao dịch trong các hidden field của form giao dịch.
2 – Người dùng điền thêm một số thông tin tùy biến (phụ thuộc vào từng loại giao dịch) trên form, và bấm submit.
3 – Tiến trình sẽ chuyển sang cổng thanh toán (qua một gateway URL), từ lúc đó cổng thanh toán sẽ thực hiện toàn bộ quá trình còn lại.
4 – Trả về (redirect) website bán hàng một mã xác định trạng thái giao dịch (thành công hay lỗi).
Với tiến trình chung như trên, lớp trừu tượng của chúng ta sẽ có:
- Những thuộc tính cơ bản như:
+ lastError: Lưu lại lỗi cuối cùng.
+ gatewayUrl: url của cổng thanh toán.
+ fields: mảng chứa các trường thiết đặt trong form…
- Những phương thức cơ bản:
+ prepareSubmit(): Các thao tác trước khi bắt đầu giao dịch.
+ addField(): Thêm các trường thiết đặt.
+ submitPayment(): Thực hiện giao dịch.
Và công việc tiếp theo khá rõ ràng, chúng ta sẽ lần lượt xem xét từng giao thức giao dịch và xây dựng module thanh toán cho từng loại dựa trên API của lớp trừu tượng PaymentGateway.
Bắt đầu từ Paypal:
class Paypal extends PaymentGateway
{
// Initialize the Paypal gateway
public function __construct()
{
parent::__construct();
// Some default values of the class
$this->gatewayUrl = 'https://www.paypal.com/cgi-bin/webscr';
// Populate $fields array with a few default
$this->addField('rm', '2'); // Return method = POST
$this->addField('cmd', '_xclick');
}
// Validate the IPN notification
public function validateIpn()
{
// Paypal IPN processing
}
}
Với định nghĩa trên, chúng ta đã xây dựng hoàn thành một module thanh toán cho Paypal, chỉ bằng cách thêm một vài trường thiết đặt. Điểm mở rộng lớn nhất từ lớp trừu tượng đó là thực thi phương thức validateIpn(), cài đặt dịch vụ IPN của Paypal vào module thanh toán. Về IPN các bạn có thể tham khảo tại đây – Instant Payment Notification, tuy nhiên nói nôm na thì IPN là dịch vụ của các dịch vụ thanh toán thông báo trạng thái giao dịch realtime cho ứng dụng (và người dùng).
Tiếp đến, giả sử bạn cần cài đặt module thanh toán cho 2Checkout:
class TwoCo extends PaymentGateway
{
// Secret word to be used for IPN verification
public $secret;
// Initialize the 2CheckOut gateway
public function __construct()
{
parent::__construct();
// Some default values of the class
$this->gatewayUrl = 'https://www.2checkout.com/checkout/purchase';
$this->ipnLogFile = '2co.ipn_results.log';
}
// Set the secret word
public function setSecret($word)
{
if (!empty($word))
{
$this>secret = $word;
}
}
// Validate the IPN notification
public function validateIpn()
{
// 2Checkout IPN proccessing
}
}
Hoàn toàn tương tự như Paypal, nhưng ở 2Checkout thấy ngay một điểm khác đó là xuất hiện trường $secret, một mã bí mật được sử dụng trong quá trình validate IPN của 2Checkout, và hàm setSecret().
Như vậy rất nhanh chóng, chúng ta xây dựng xong 2 module thanh toán cho 2 dịch vụ thanh toán trực tuyến: Paypal và 2Checkout. Gian hàng của bạn đã có thể chấp nhận được và sẵn sàng cho một cuộc mua bán đậm mùi tiền:
// Include the paypal library
include_once ('Paypal.php');
// Create an instance of the paypal library
$myPaypal = new Paypal();
// Specify your paypal email
$myPaypal->addField('business', 'YOUR_PAYPAL_EMAIL');
// Specify the currency
$myPaypal->addField('currency_code', 'USD');
// Specify the url where paypal will send the user on success/failure
$myPaypal->addField('return', 'http://YOUR_HOST/payment/paypal_success.php');
$myPaypal->addField('cancel_return', 'http://YOUR_HOST/payment/paypal_failure.php');
// Specify the url where paypal will send the IPN
$myPaypal->addField('notify_url', 'http://YOUR_HOST/payment/paypal_ipn.php');
// Specify the product information
$myPaypal->addField('item_name', 'T-Shirt');
$myPaypal->addField('amount', '9.99');
$myPaypal->addField('item_number', '001');
// Specify any custom value
$myPaypal->addField('custom', 'muri-khao');
Hoặc với 2Checkout:
// Include the paypal library
include_once ('TwoCo.php');
// Create an instance of the authorize.net library
$my2CO = new TwoCo();
// Specify your 2CheckOut vendor id
$my2CO->addField('sid', 'YOUR_VENDOR_ID');
// Specify the order information
$my2CO->addField('cart_order_id', rand(1, 100));
$my2CO->addField('total', '9.99');
// Specify the url where authorize.net will send the IPN
$my2CO->addField('x_Receipt_Link_URL', 'http://YOUR_HOST/payment/twoco_ipn.php');
$my2CO->addField('tco_currency', 'USD');
$my2CO->addField('custom', 'muri-khao');
Với một module thanh toán cross-gateway như thế, chúng ta sẽ có một hàm kiểu như:
function payment($paymentGateway)
{
$paymentGateway->submitPayment();
}
Một ví dụ tương tự như thế về những chiếc TV và Đa hình đã có ở phần trước. Chúng ta sẽ hiểu với bất cứ một phương thức giao dịch nào sử dụng API của PaymentGateway đều cài đặt hàm submitPayment() và đều có thể sử dụng để thanh toán qua hàm payment() trên.
Lúc này có lẽ giải pháp sử dụng Adaptor Pattern đã rõ ràng hơn. Khi có nhiều classes thực thi cùng 1 dịch vụ và sử dụng chung một API, thì chúng ta có thể sử dụng Adaptor Pattern để tạo ra một giao diện chung và tận dụng sức mạnh của Đa hình để khai thác tối đa sự tiện ích của lập trình hướng đối tượng. Có thể thấy việc phát triển các module cho từng phương thức thanh toán đã tường minh và sáng sủa hơn. Với một thiết kế tốt như thế, chương trình của chúng ta sẽ có thể dễ dàng bảo trì, cải tiến, mở rộng trong tương lai.
Adaptor Pattern cũng có thể hữu dụng trong một số trường hợp khác:
- Problem A: Khi sử dụng các library mã đóng với API không thể thay đổi, trong khi chúng ta cần một giao diện sử dụng khác, để tương thích với một framework chẳng hạn. Thì chúng ta sẽ định nghĩa một third-party class sử dụng Adaptor Pattern để tạo ra một class mới với giao diện tương thích. Trong trường hợp chúng ta có thể hình dung class đó như một “bộ chuyển đổi” (adaptor), tương tự như các bộ chuyển đổi thường thấy trong thường ngày: chuyển từ phích cắm nguồn 3 chân sang 2 chân, từ cổng mini-USB sang USB 2.0… với mục đích sử dụng cho các thiết bị khác nhau.
- Problem B: Phần core của PHP được xây dựng từ rất lâu với các thư viện hàm tích hợp vẫn theo hướng thủ tục (chứ không phải hướng đối tượng). Và có rất nhiều thao tác sử dụng cần thiết phải gọi 1 loạt các hàm liên tiếp nhau và được liên kết thông qua một biến, handler. Ví dụ như khi cần làm việc với cơ sở dữ liệu MySQL, chúng ta luôn phải thực hiện việc gọi các hàm tuần tự:
$user="username"; $password="password"; $database="database"; mysql_connect(localhost,$user,$password); @mysql_select_db($database) or die( "Unable to select database"); $query="SELECT * FROM table"; mysql_query($query); mysql_close();
Chúng ta có thể sử dụng Adaptor Pattern để tạo ra một adaptor, làm nhiệm vụ thực hiện tất cả những tiến trình đó và lưu giữ kết nối với database trên một handler – là một thuộc tính của adaptor class. Ví dụ cho phần này có thể xem thêm ở chương 2, cuốn Advance PHP Programming.
Tham khảo:
Chapter 2, Part 1, Advance PHP Programming.
Toàn bộ phần code minh họa được bóc tách ra từ thư viện PHP Payment Library. Có thể download tại đây - [PHP Payment Library]
Tags: adaptor pattern, design pattern, payment, shopping
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