Using RPC services built with TP6 Think-Swoole to implement distributed transaction processing

Distributed systems are becoming more and more common in modern Internet applications. However, distributed transaction processing is a challenge to achieve consistency in a distributed environment. When dealing with complex business logic across multiple services, ensuring data consistency and reliability becomes especially important.

In this article, we will use ThinkPHP 6 and Swoole to build an RPC (Remote Procedure Call, remote procedure call) service and implement distributed transaction processing through this service. We'll cover how to create a basic RPC service and show how to perform transaction operations through it.

1. Architecture Overview

We will use the following architecture to implement distributed transaction processing:

• Main application (Client): It is our The core application is responsible for processing business logic and processing distributed transactions.
• Sub-application (Server): It is our RPC service provider and is responsible for receiving and executing remote call requests.
• Database: We use MySQL as the database storage engine.

2. Install ThinkPHP 6

First, we need to install ThinkPHP 6. The installation can be completed through Composer, run the following command:

composer create-project topthink/think=6.* myproject

3. Install Swoole extension

In order to use ThinkPHP's Swoole plug-in, we also need to install the Swoole extension. The installation guide can be found on Swoole’s official website.

4. Configuring the Swoole plug-in

In ThinkPHP 6, the Swoole plug-in is provided as an extension. We need to configure it in the application configuration file config/app.php. Find the following code segment:

return [
    // ...
    'ext' => [
        // ...
    ],
    // ...
];

Add thinkswooleSwoole to the ext array, as shown below:

return [
    // ...
    'ext' => [
        thinkswooleSwoole::class,
    ],
    // ...
];

5. Create RPC service

In ThinkPHP 6, we can use middleware to implement RPC services. Create a new middleware class, create a file named RpcMiddleware.php in the app/middleware directory, and write the following code in it:

<?php

namespace appmiddleware;

use SwooleCoroutine;
use thinkswoolepcserverResponse;
use thinkswoolepcserverReceiveContext;
use thinkswooleRpc;

class RpcMiddleware
{
    public function handle(ReceiveContext $context, Closure $next)
    {
        // 執(zhí)行遠(yuǎn)程過程調(diào)用
        $response = new Response();
        $rpc = new Rpc();
        $rpc->dispatch($context->getRaw(), $response);
        // 獲取執(zhí)行結(jié)果
        $result = $response->getMessage();

        if ($response->getCode() === Rpc::RESULT_CODE_SUCCESS) {
            // 執(zhí)行成功，將結(jié)果返回給客戶端
            $context->reply($result);
        } else {
            // 出現(xiàn)錯(cuò)誤，設(shè)置錯(cuò)誤代碼和消息
            $context->setCode($response->getCode());
            $context->setMessage($response->getMessage());
        }

        return $next($context);
    }
}

6. Configuring RPC service

In ThinkPHP 6, we can define middleware through configuration files. Open the config/middleware.php file and add the middleware class you want to use as follows:

return [
    // ...
    // rpc服務(wù)中間件
    appmiddlewareRpcMiddleware::class,
];

Then, we need to add the file in config/swoole.php Make some additional configuration in the file. Find the following code snippet:

return [
    // ...
    'rpc' => [
        // ...
    ],
    // ...
];

Add the following code in the rpc array:

return [
    // ...
    'rpc' => [
        'server' => [
            // 綁定服務(wù)地址和端口
            'host' => '127.0.0.1',
            'port' => 9502,
        ],
        'services' => [
            // 注冊服務(wù)
            'AppRpcServicesTransactionService',
        ],
    ],
    // ...
];

7. Create transaction service

We will Create a service class named TransactionService to handle distributed transactions. Create a file named TransactionService.php in the app/rpc/services directory and write the following code in it:

<?php

namespace apppcservices;

use thinkswoolepcRequest;
use thinkswoolepcResponse;

class TransactionService
{
    public function beginTransaction(Request $request, Response $response)
    {
        // 執(zhí)行事務(wù)開始操作
        // ...

        $response->setCode(Response::CODE_SUCCESS);
        $response->setMessage('事務(wù)開始成功');
    }

    public function commit(Request $request, Response $response)
    {
        // 執(zhí)行事務(wù)提交操作
        // ...

        $response->setCode(Response::CODE_SUCCESS);
        $response->setMessage('事務(wù)提交成功');
    }

    public function rollback(Request $request, Response $response)
    {
        // 執(zhí)行事務(wù)回滾操作
        // ...

        $response->setCode(Response::CODE_SUCCESS);
        $response->setMessage('事務(wù)回滾成功');
    }
}

8. Call the RPC service

Finally, we will call the RPC service in the main application to perform distributed transaction processing. Create a new controller class, create a file named TransactionController.php in the app/controller directory, and write the following code in it:

<?php

namespace appcontroller;

use thinkacadeRpc;
use thinkswoolepcRequest;

class TransactionController
{
    public function beginTransaction()
    {
        // 創(chuàng)建RPC請求
        $request = new Request();
        $request->setService('AppRpcServicesTransactionService');
        $request->setMethod('beginTransaction');

        // 發(fā)起遠(yuǎn)程調(diào)用
        $result = Rpc::call($request);

        // 處理返回結(jié)果
        if ($result->getCode() === 200) {
            // 操作成功
            return '事務(wù)開始成功';
        } else {
            // 操作失敗
            throw new Exception($result->getMessage(), $result->getCode());
        }
    }

    public function commit()
    {
        // 創(chuàng)建RPC請求
        $request = new Request();
        $request->setService('AppRpcServicesTransactionService');
        $request->setMethod('commit');

        // 發(fā)起遠(yuǎn)程調(diào)用
        $result = Rpc::call($request);

        // 處理返回結(jié)果
        if ($result->getCode() === 200) {
            // 操作成功
            return '事務(wù)提交成功';
        } else {
            // 操作失敗
            throw new Exception($result->getMessage(), $result->getCode());
        }
    }

    public function rollback()
    {
        // 創(chuàng)建RPC請求
        $request = new Request();
        $request->setService('AppRpcServicesTransactionService');
        $request->setMethod('rollback');

        // 發(fā)起遠(yuǎn)程調(diào)用
        $result = Rpc::call($request);

        // 處理返回結(jié)果
        if ($result->getCode() === 200) {
            // 操作成功
            return '事務(wù)回滾成功';
        } else {
            // 操作失敗
            throw new Exception($result->getMessage(), $result->getCode());
        }
    }
}

9. Testing the RPC Service

Now we can test our RPC service using a browser or other HTTP client. Access the /transaction/beginTransaction, /transaction/commit and /transaction/rollback routes in the browser to trigger the transaction start, commit and transaction in the RPC service respectively. Rollback operation. If the operation is successful, you will see the Operation Success message.

This is the basic process of implementing distributed transaction processing using the RPC service built by TP6 Think-Swoole. Through RPC services, we can handle complex transaction operations in a distributed environment and ensure data consistency and reliability.

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