Swoft的HttpServer启动及请求工作流程(三)--Request及Response封装过程

码农天地 - 2020-12-10 09:21:41

上一回讲到给Server添加了10个swoole监听事件.
在添加完swoole的事件后,框架调用Swoft的trigger()方法触发了几种用户注册的生命周期事件.
接着框架调用server的start()方法,正式开始接受用户请求.

本章将从onRequest事件着手,逐步分析Swoole原生的Request及Response封装成Swoft中使用的Swoft\Http\Message\Request和Swoft\Http\Message\Response的过程.

先看onRequest代码:

public function onRequest(Request $request, Response $response): void
{
    $psrRequest = ServerRequest::new($request);
    $psrResponse = ServerResponse::new($response);
    $this->dispatcher->dispatch($psrRequest, $psrResponse);
}

此方法是swoole的onRequest回调函数,所以参数传进来的Request和Response分别对应的类型是Swoole\Http\Request和Swoole\Http\Response.
可以看到,在收到参数后,框架干的第一件事就是调用Swoft\Http\Message\Request和Swoft\Http\Message\Response的new方法,生成与之对应的符合psr规范的对象.
接着,框架将新生成的request和response对象作为参数传递给调度函数,由调度函数去执行具体的业务逻辑并返回结果给客户端.

实现细节之(Swoft\Http\Message\Request::new):
此方法以及里面用到的Uri::new方法都是获取PROTOTYPE模式的bean

public static function new(CoRequest $coRequest): self
{
     //此处获取的bean是一个新的对象,因为当前类的bean注解
     //为PROTOTYPE模式
     //@Bean(name="httpRequest", scope=Bean::PROTOTYPE)
     /** @var Request $self */
     $self = BeanFactory::getBean('httpRequest');
     
     // Server params
     // 获取Swoole原生Request对象的server参数
     $serverParams = $coRequest->server;
     
     // 将Swoole原生Request对象中的header设置到新获取的bean对象上
     // Set headers
     $self->initializeHeaders($headers = $coRequest->header ?: []);
     
     // 设置请求方式
     $self->method = $serverParams['request_method'] ?? '';
     
     // 绑定原生Request对象到新的bean对象上
     $self->coRequest = $coRequest;
     
     // 设置GET请求参数
     $self->queryParams = $coRequest->get ?: [];
     
     // 设置COOKIE
     $self->cookieParams = $coRequest->cookie ?: [];
     
     // 设置SERVER参数
     $self->serverParams = $serverParams;
     
     // 将请求的URI设置为requestTarget
     $self->requestTarget = $serverParams['request_uri'] ?? '';
     
     // 设置URI
     // Save
     $self->uriPath = $serverParams['request_uri'] ?? '';
     
     // 设置QUERY_STRING
     $self->uriQuery = $serverParams['query_string'] ?? '';
     
     // 如果URI中还包含?号,说明还需要处理
     if (strpos($self->uriPath, '?') !== false) {
         // Split
         $parts = explode('?', $self->uriPath, 2);
         $self->uriPath = $parts[0];
         $self->uriQuery = $parts[1] ?? $self->uriQuery;
     }
     
     // 调用Uri类构造Uri对象并绑定给新的bean对象
     /** @var Uri $uri */
     $self->uri = Uri::new('', [
         'host' => $headers['host'] ?? '',
         'path' => $self->uriPath,
         'query' => $self->uriQuery,
         'https' => $serverParams['https'] ?? '',
         'http_host' => $serverParams['http_host'] ?? '',
         'server_name' => $serverParams['server_name'] ?? '',
         'server_addr' => $serverParams['server_addr'] ?? '',
         'server_port' => $serverParams['server_port'] ?? '',
     ]);
     
     // 如果当前headers里面没有host数据,则通过Uri对象去更新
     // 
     // Update host by Uri info
     if (!isset($headers['host'])) {
        $self->updateHostByUri();
     }
     return $self;
}

Uri::new的实现:

public static function new(string $uri = '', array $params = []): self
{
     /** @var Uri $instance */
     $instance = Swoft::getBean(self::class);
     // Save some params
     $instance->params = $params;
     // Weak type check to also accept null until we can add scalar type hints
     if ($uri === '') {
        return $instance;
     }
     // If params is empty, padding defaults data
     if (!$params) {
        $instance->params = self::DEFAULT_PARAMS;
     }
     $parts = parse_url($uri);
     if ($parts === false) {
        throw new InvalidArgumentException("Unable to parse URI: $uri");
     }
     $instance->applyParts($parts);
     return $instance;
}

实现细节之(Swoft\Http\Message\Response::new):
此方法仍然是获取PROTOTYPE模式的bean,请求初期只是很单纯的设置了是否发送的状态以及绑定原生Response对象,并未做过多设置.

public static function new(CoResponse $coResponse): self
{
     /** @var Response $self */
     $self = BeanFactory::getBean('httpResponse');
     // $self = bean('httpResponse');
     $self->sent = false;
     $self->coResponse = $coResponse;
     return $self;
}

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