yii2源码（2）--路由

最新推荐文章于 2021-04-09 01:20:02 发布

转载最新推荐文章于 2021-04-09 01:20:02 发布 · 686 阅读

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本文深入分析了Yii2框架中请求处理的核心流程，特别是如何通过UrlManager组件解析URL，确定路由和参数的过程。

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在yii2源码（1）--执行流程中提到，在\yii\web\Application.php文件中有一下代码：

public function handleRequest($request)
{
    if (empty($this->catchAll)) {
        list ($route, $params) = $request->resolve();//取出路由及参数，下节再具体分析（调用了urlManager组件）
    } else {
        $route = $this->catchAll[0];
        $params = $this->catchAll;
        unset($params[0]);
    }
    try {
        Yii::trace("Route requested: '$route'", __METHOD__);
        $this->requestedRoute = $route;
        $result = $this->runAction($route, $params);//运行控制器中的Acition，下面有详细介绍
        if ($result instanceof Response) {
            return $result;
        } else {
            $response = $this->getResponse();

/*这个是加载yii\base\Response类，在外部可以Yii::$app->get('response')、Yii::$app->getResponse()、Yii::$app->response 等等方式来加载response类，主要用来加载http状态，及头信息，如301,302，404，ajax头等等的获取*/

            if ($result !== null) {
                $response->data = $result;
            }

            return $response;
        }
    } catch (InvalidRouteException $e) {
        throw new NotFoundHttpException(Yii::t('yii', 'Page not found.'), $e->getCode(), $e);
    }
}

$request->resolve()方法调用并加载了urlManager组件，这节分析urlManager组件的加载和运行

在yii2/web/Request.php文件中：

    public function resolve()
    {
        $result = Yii::$app->getUrlManager()->parseRequest($this); // 获得UrlManager对象，并处理request，获得路由和参数
        if ($result !== false) {
            list ($route, $params) = $result;
            if ($this->_queryParams === null) {
                $_GET = $params + $_GET; // preserve numeric keys
            } else {
                $this->_queryParams = $params + $this->_queryParams;
            }
            return [$route, $this->getQueryParams()];
        } else {
            throw new NotFoundHttpException(Yii::t('yii', 'Page not found.'));
        }
    }

Yii::$app->getUrlManager()方法返回了yii\web\UrlManager对象，然后parseRequest($this); 调用了yii2/web/UrlManager.php文件的 parseRequest方法：

    public function parseRequest($request)
    {
        if ($this->enablePrettyUrl) {
            /* @var $rule UrlRule */
            foreach ($this->rules as $rule) {
                $result = $rule->parseRequest($this, $request);
                if (YII_DEBUG) {
                    Yii::trace([
                        'rule' => method_exists($rule, '__toString') ? $rule->__toString() : get_class($rule),
                        'match' => $result !== false,
                        'parent' => null
                    ], __METHOD__);
                }
                if ($result !== false) {
                    return $result;
                }
            }

            if ($this->enableStrictParsing) {
                return false;
            }

            Yii::trace('No matching URL rules. Using default URL parsing logic.', __METHOD__);

            $suffix = (string) $this->suffix;
            $pathInfo = $request->getPathInfo();
            $normalized = false;
            if ($this->normalizer !== false) {
                $pathInfo = $this->normalizer->normalizePathInfo($pathInfo, $suffix, $normalized);
            }
            if ($suffix !== '' && $pathInfo !== '') {
                $n = strlen($this->suffix);
                if (substr_compare($pathInfo, $this->suffix, -$n, $n) === 0) {
                    $pathInfo = substr($pathInfo, 0, -$n);
                    if ($pathInfo === '') {
                        // suffix alone is not allowed
                        return false;
                    }
                } else {
                    // suffix doesn't match
                    return false;
                }
            }

            if ($normalized) {
                // pathInfo was changed by normalizer - we need also normalize route
                return $this->normalizer->normalizeRoute([$pathInfo, []]);
            } else {
                return [$pathInfo, []];
            }
        } else {
            Yii::trace('Pretty URL not enabled. Using default URL parsing logic.', __METHOD__);
            $route = $request->getQueryParam($this->routeParam, '');
            if (is_array($route)) {
                $route = '';
            }

            return [(string) $route, []];
        }
    }