:::tip{title="提问"}
你是一个经验丰富的程序开发者，我需要你为我的问题提供解决思路和完整代码，我的问题是：如何给Laravel框架设计一套rpc调用
:::

答：
为了在Laravel框架中实现RPC调用，可以按照以下流程进行操作：



1. 安装依赖

在Laravel项目根目录下使用composer安装“php-amqplib/php-amqplib”依赖，用于建立与RabbitMQ的连接。

```
composer require php-amqplib/php-amqplib
```

2. 创建RabbitMQ通道

在Laravel应用程序中创建一个RabbitMQ通道，该通道将用于请求和响应。可以使用以下代码创建通道:

```php
<?php

use PhpAmqpLib\Connection\AMQPStreamConnection;
use PhpAmqpLib\Message\AMQPMessage;

class RabbitMQChannel
{
    protected $connection;
    protected $channel;
    protected $callbackQueue;
    protected $response;
    protected $corrId;

    public function __construct()
    {
        $this->connection = new AMQPStreamConnection(
            'localhost',
            5672,
            'guest',
            'guest'
        );

        $this->channel = $this->connection->channel();

        list($this->callbackQueue, ,) = $this->channel->queue_declare(
            '',
            false,
            false,
            true,
            false
        );

        $this->channel->basic_consume(
            $this->callbackQueue,
            '',
            false,
            false,
            false,
            false,
            array($this, 'onResponse')
        );
    }

    public function onResponse($msg)
    {
        if ($msg->get('correlation_id') == $this->corrId) {
            $this->response = $msg->body;
        }
    }

    public function sendRequest($request)
    {
        $this->response = null;
        $this->corrId = uniqid();

        $msg = new AMQPMessage(
            $request,
            array(
                'correlation_id' => $this->corrId,
                'reply_to' => $this->callbackQueue
            )
        );

        $this->channel->basic_publish(
            $msg,
            '',
            'rpc_queue'
        );

        while (!$this->response) {
            $this->channel->wait();
        }

        return $this->response;
    }

    public function __destruct()
    {
        $this->channel->close();
        $this->connection->close();
    }
}
```

在该类中，我们建立了与RabbitMQ的连接，并创建了通道。我们还定义了响应队列

3. 创建RPC服务

在Laravel应用程序中创建一个RPC服务，该服务将使用RabbitMQ通道向远程RPC服务器发送请求并接收响应。可以使用以下代码创建一个RPC服务：

```php
<?php

class RpcService
{
    protected $rabbitMQChannel;

    public function __construct(RabbitMQChannel $rabbitMQChannel)
    {
        $this->rabbitMQChannel = $rabbitMQChannel;
    }

    public function call($methodName, $params)
    {
        $request = json_encode(array(
            'method' => $methodName,
            'params' => $params,
        ));

        $response = $this->rabbitMQChannel->sendRequest($request);

        return json_decode($response);
    }
}
```

在该类中，我们使用RabbitMQ通道发送请求，并等待响应。我们还返回解码的响应。

4. 创建RPC服务器

在Laravel应用程序中创建一个RPC服务器，该服务器将处理RPC请求并返回响应。可以使用以下代码创建一个RPC服务器：

```php
<?php

use PhpAmqpLib\Connection\AMQPStreamConnection;
use PhpAmqpLib\Message\AMQPMessage;

class RpcServer
{
    protected $connection;
    protected $channel;
    protected $callbackQueue;

    public function __construct()
    {
        $this->connection = new AMQPStreamConnection(
            'localhost',
            5672,
            'guest',
            'guest'
        );

        $this->channel = $this->connection->channel();

        $this->channel->queue_declare(
            'rpc_queue',
            false,
            false,
            false,
            false
        );

        $this->channel->basic_qos(null, 1, null);

        $this->channel->basic_consume(
            'rpc_queue',
            '',
            false,
            false,
            false,
            false,
            array($this, 'onRequest')
        );
    }

    public function onRequest($request)
    {
        $request = json_decode($request->body);

        $methodName = $request->method;
        $params = $request->params;

        $result = call_user_func_array(array($this, $methodName), $params);

        $response = new AMQPMessage(
            json_encode($result),
            array(
                'correlation_id' => $request->correlation_id
            )
        );

        $request->delivery_info['channel']->basic_publish(
            $response,
            '',
            $request->get('reply_to')
        );

        $request->delivery_info['channel']->basic_ack(
            $request->delivery_info['delivery_tag']
        );
    }

    public function __destruct()
    {
        $this->channel->close();
        $this->connection->close();
    }

    public function sum($a, $b)
    {
        return $a + $b;
    }
}
```

在该类中，我们处理收到的RPC请求，并将响应返回到客户端。

5. 调用RPC服务

在应用程序中调用RPC服务，可以使用以下代码：

```php
<?php

$rabbitMQChannel = new RabbitMQChannel();
$rpcService = new RpcService($rabbitMQChannel);

$result = $rpcService->call('sum', array(10, 20));
```

在该代码中，我们创建了RabbitMQ通道用于RPC服务器通信，并创建了RPC服务。然后，我们使用RPC服务调用sum方法，并传递10和20作为参数，并等待响应。

完整代码可见于下面的代码片段：

```php
<?php

use PhpAmqpLib\Connection\AMQPStreamConnection;
use PhpAmqpLib\Message\AMQPMessage;

class RabbitMQChannel
{
    protected $connection;
    protected $channel;
    protected $callbackQueue;
    protected $response;
    protected $corrId;

    public function __construct()
    {
        $this->connection = new AMQPStreamConnection(
            'localhost',
            5672,
            'guest',
            'guest'
        );

        $this->channel = $this->connection->channel();

        list($this->callbackQueue, ,) = $this->channel->queue_declare(
            '',
            false,
            false,
            true,
            false
        );

        $this->channel->basic_consume(
            $this->callbackQueue,
            '',
            false,
            false,
            false,
            false,
            array($this, 'onResponse')
        );
    }

    public function onResponse($msg)
    {
        if ($msg->get('correlation_id') == $this->corrId) {
            $this->response = $msg->body;
        }
    }

    public function sendRequest($request)
    {
        $this->response = null;
        $this->corrId = uniqid();

        $msg = new AMQPMessage(
            $request,
            array(
                'correlation_id' => $this->corrId,
                'reply_to' => $this->callbackQueue
            )
        );

        $this->channel->basic_publish(
            $msg,
            '',
            'rpc_queue'
        );

        while (!$this->response) {
            $this->channel->wait();
        }

        return $this->response;
    }

    public function __destruct()
    {
        $this->channel->close();
        $this->connection->close();
    }
}

class RpcService
{
    protected $rabbitMQChannel;

    public function __construct(RabbitMQChannel $rabbitMQChannel)
    {
        $this->rabbitMQChannel = $rabbitMQChannel;
    }

    public function call($methodName, $params)
    {
        $request = json_encode(array(
            'method' => $methodName,
            'params' => $params,
        ));

        $response = $this->rabbitMQChannel->sendRequest($request);

        return json_decode($response);
    }
}

class RpcServer
{
    protected $connection;
    protected $channel;
    protected $callbackQueue;

    public function __construct()
    {
        $this->connection = new AMQPStreamConnection(
            'localhost',
            5672,
            'guest',
            'guest'
        );

        $this->channel = $this->connection->channel();

        $this->channel->queue_declare(
            'rpc_queue',
            false,
            false,
            false,
            false
        );

        $this->channel->basic_qos(null, 1, null);

        $this->channel->basic_consume(
            'rpc_queue',
            '',
            false,
            false,
            false,
            false,
            array($this, 'onRequest')
        );
    }

    public function onRequest($request)
    {
        $request = json_decode($request->body);

        $methodName = $request->method;
        $params = $request->params;

        $result = call_user_func_array(array($this, $methodName), $params);

        $response = new AMQPMessage(
            json_encode($result),
            array(
                'correlation_id' => $request->correlation_id
            )
        );

        $request->delivery_info['channel']->basic_publish(
            $response,
            '',
            $request->get('reply_to')
        );

        $request->delivery_info['channel']->basic_ack(
            $request->delivery_info['delivery_tag']
        );
    }

    public function __destruct()
    {
        $this->channel->close();
        $this->connection->close();
    }

    public function sum($a, $b)
    {
        return $a + $b;
    }
}

$rabbitMQChannel = new RabbitMQChannel();
$rpcService = new RpcService($rabbitMQChannel);

$result = $rpcService->call('sum', array(10, 20));

var_dump($result);
```

这就是在Laravel框架中实现RPC调用的完整代码。

ChatGPT-如何给Laravel框架设计一套rpc调用

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