Distributed transaction processing using RPC services built with TP6 Think-Swoole

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)
    {
        // 执行远程过程调用
        $response = new Response();
        $rpc = new Rpc();
        $rpc->dispatch($context->getRaw(), $response);
        // 获取执行结果
        $result = $response->getMessage();

        if ($response->getCode() === Rpc::RESULT_CODE_SUCCESS) {
            // 执行成功，将结果返回给客户端
            $context->reply($result);
        } else {
            // 出现错误，设置错误代码和消息
            $context->setCode($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服务中间件
    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' => [
            // 绑定服务地址和端口
            'host' => '127.0.0.1',
            'port' => 9502,
        ],
        'services' => [
            // 注册服务
            '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)
    {
        // 执行事务开始操作
        // ...

        $response->setCode(Response::CODE_SUCCESS);
        $response->setMessage('事务开始成功');
    }

    public function commit(Request $request, Response $response)
    {
        // 执行事务提交操作
        // ...

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

    public function rollback(Request $request, Response $response)
    {
        // 执行事务回滚操作
        // ...

        $response->setCode(Response::CODE_SUCCESS);
        $response->setMessage('事务回滚成功');
    }
}

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()
    {
        // 创建RPC请求
        $request = new Request();
        $request->setService('AppRpcServicesTransactionService');
        $request->setMethod('beginTransaction');

        // 发起远程调用
        $result = Rpc::call($request);

        // 处理返回结果
        if ($result->getCode() === 200) {
            // 操作成功
            return '事务开始成功';
        } else {
            // 操作失败
            throw new Exception($result->getMessage(), $result->getCode());
        }
    }

    public function commit()
    {
        // 创建RPC请求
        $request = new Request();
        $request->setService('AppRpcServicesTransactionService');
        $request->setMethod('commit');

        // 发起远程调用
        $result = Rpc::call($request);

        // 处理返回结果
        if ($result->getCode() === 200) {
            // 操作成功
            return '事务提交成功';
        } else {
            // 操作失败
            throw new Exception($result->getMessage(), $result->getCode());
        }
    }

    public function rollback()
    {
        // 创建RPC请求
        $request = new Request();
        $request->setService('AppRpcServicesTransactionService');
        $request->setMethod('rollback');

        // 发起远程调用
        $result = Rpc::call($request);

        // 处理返回结果
        if ($result->getCode() === 200) {
            // 操作成功
            return '事务回滚成功';
        } else {
            // 操作失败
            throw new Exception($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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