zanphp源码解读 - 请求与响应

前言

也许这是咱们最关系的一个环节了。一个web应用简单来讲无非就是请求和相应了。
获取你真的该补补 协程 的相关知识了。不过。。
不懂协程懂进程~ 那就 当成进程来看 一个请求一个进 (xie) 程.
懂线程~ 那就 当成 线程来看 一个请求一个线 (xie) 程

分析 RequestHandler

vendor/zanphp/http-server/src/RequestHandler.php

class RequestHandler
{
    // ...
    
    // 让 协程来 处理每一个 请求 
    $requestTask = new RequestTask($request, $swooleResponse, $this->context, $this->middleWareManager);
    $coroutine = $requestTask->run();
    $this->task = new Task($coroutine, $this->context);
    $this->task->run();
    clear_ob();
    // ..
}

分析 RequestTask

vendor/zanphp/http-server/src/RequestTask.php

class RequestTask
{
    public function run()
    {
        yield $this->doRun();
    }
    
    public function doRun()
    {
        // 处理 中间件 逻辑
        $response = (yield $this->middleWareManager->executeFilters());
        if (null !== $response) {
            $this->context->set('response', $response);
            /** @var ResponseTrait $response */
            yield $response->sendBy($this->swooleResponse);
            $this->context->getEvent()->fire($this->context->get('request_end_event_name'));
            return;
        }

        // 处理 中间件 放行后的 逻辑
        $dispatcher = Di::make(Dispatcher::class);
        $response = (yield $dispatcher->dispatch($this->request, $this->context));
        if (null === $response) {
            $code = BaseResponse::HTTP_INTERNAL_SERVER_ERROR;
            $response = new InternalErrorResponse("网络错误($code)", $code);
        }

        yield $this->middleWareManager->executePostFilters($response);

        $this->context->set('response', $response);
        yield $response->sendBy($this->swooleResponse);

        $this->context->getEvent()->fire($this->context->get('request_end_event_name'));
        clear_ob();
    }
}

分析 Dispatcher

vendor/zanphp/http-server/src/Dispatcher.php

<?php

class Dispatcher
{
    public function dispatch(Request $request, Context $context)
    {
        // 看到这些 你应该似曾相识 
        $controllerName = $context->get('controller_name');
        $action = $context->get('action_name');
        $args   = $context->get('action_args');

        if ($args == null) {
            $args = [];
        }

        if ($controllerName === "/" && is_callable($action)) {
            yield $action(...array_values($args));
        } else {
            $controller = $this->getControllerClass($controllerName);
            if(!class_exists($controller)) {
                
                // 这些错 常见吧
                throw new PageNotFoundException("controller:{$controller} not found");
            }

            $controller = new $controller($request, $context);
            if(!is_callable([$controller, $action])) {
                
                // 这些错 常见吧
                throw new PageNotFoundException("action:{$action} is not callable in controller:" . get_class($controller));
            }
            yield $controller->$action(...array_values($args));
        }
    }

}