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<p>  这是框架中kernel管道中的源码,through 方法将获取 App\Http\kernel中的$middleware数组，给Pipeline中的pipes属性赋值(与上篇中的$pipes一样),规定需要通过的中间件。</p>
<h4 id="middleware"><a href="#middleware" class="headerlink" title="middleware"></a>middleware</h4><p>App\Http\kernel中的$middleware 如下<br><figure class="highlight tex"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line">protected <span class="formula">$middleware = [</span></span><br><span class="line"><span class="formula"> //判断当前项目是否处于维护模式</span></span><br><span class="line"><span class="formula"> <span class="tag">\<span class="name">Illuminate</span></span><span class="tag">\<span class="name">Foundation</span></span><span class="tag">\<span class="name">Http</span></span><span class="tag">\<span class="name">Middleware</span></span><span class="tag">\<span class="name">CheckForMaintenanceMode</span></span>::class,</span></span><br><span class="line"><span class="formula"> //响应头Cookie如XSRF-TOKEN，laravel_session加密，以及对应Request的Cookie解密</span></span><br><span class="line"><span class="formula"> <span class="tag">\<span class="name">App</span></span><span class="tag">\<span class="name">Http</span></span><span class="tag">\<span class="name">Middleware</span></span><span class="tag">\<span class="name">EncryptCookies</span></span>::class, </span></span><br><span class="line"><span class="formula"> //获取CookieJar队列中的Cookie类, 并存入响应头, 如用户登录remember_token</span></span><br><span class="line"><span class="formula"> <span class="tag">\<span class="name">Illuminate</span></span><span class="tag">\<span class="name">Cookie</span></span><span class="tag">\<span class="name">Middleware</span></span><span class="tag">\<span class="name">AddQueuedCookiesToResponse</span></span>::class, </span></span><br><span class="line"><span class="formula"> //初始化session,整个底层并未session_start,通过手动生成session_id来完成这一动作</span></span><br><span class="line"><span class="formula"> <span class="tag">\<span class="name">Illuminate</span></span><span class="tag">\<span class="name">Session</span></span><span class="tag">\<span class="name">Middleware</span></span><span class="tag">\<span class="name">StartSession</span></span>::class,</span></span><br><span class="line"><span class="formula"> //将session中的errors变量，注入到全局视图类中。这是个一次性session</span></span><br><span class="line"><span class="formula"> <span class="tag">\<span class="name">Illuminate</span></span><span class="tag">\<span class="name">View</span></span><span class="tag">\<span class="name">Middleware</span></span><span class="tag">\<span class="name">ShareErrorsFromSession</span></span>::class,</span></span><br><span class="line"><span class="formula"> //Csrf 验证请求中的XSRF-TOKEN值</span></span><br><span class="line"><span class="formula"> <span class="tag">\<span class="name">App</span></span><span class="tag">\<span class="name">Http</span></span><span class="tag">\<span class="name">Middleware</span></span><span class="tag">\<span class="name">VerifyCsrfToken</span></span>::class,</span></span><br><span class="line"><span class="formula"> ];</span></span><br></pre></td></tr></table></figure><br><a id="more"></a><br><figure class="highlight livescript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">......</span><br><span class="line"><span class="keyword">return</span> (<span class="keyword">new</span> Pipeline($<span class="keyword">this</span>->app))</span><br><span class="line"><span class="function"> -></span>send($request)</span><br><span class="line"><span class="function"> -></span>through($<span class="keyword">this</span>->app->shouldSkipMiddleware() ? [] : $<span class="keyword">this</span>->middleware)</span><br><span class="line"><span class="function"> -></span><span class="keyword">then</span>($<span class="keyword">this</span>->dispatchToRouter());</span><br></pre></td></tr></table></figure></p>
<h4 id="then方法"><a href="#then方法" class="headerlink" title="then方法"></a>then方法</h4><p>首先关注其参数,是将当前请求经kernel中间件处理完毕后，分配至路由需要执行的最终Closure<br><figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br></pre></td><td class="code"><pre><span class="line"> <span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">then</span><span class="params">(Closure $destination)</span></span></span><br><span class="line"><span class="function"> </span>{ </span><br><span class="line"> $destination = <span class="function"><span class="keyword">function</span> <span class="params">($request)</span> </span>{</span><br><span class="line"> </span><br><span class="line"> <span class="keyword">$this</span>->app->instance(<span class="string">'request'</span>, $request);</span><br><span class="line"> </span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">$this</span>->router->dispatch($request); <span class="comment">// 请求最终到达的路由</span></span><br><span class="line"></span><br><span class="line"> };</span><br><span class="line"> $firstSlice = <span class="keyword">$this</span>->getInitialSlice($destination);</span><br><span class="line"></span><br><span class="line"> $pipes = array_reverse(<span class="keyword">$this</span>->pipes); <span class="comment">//即中间件数组 顺序颠倒,因为array_reduce使用逆嵌套</span></span><br><span class="line"><span class="comment">// $this->passable就是request类</span></span><br><span class="line"> <span class="keyword">return</span> call_user_func(</span><br><span class="line"> array_reduce($pipes, <span class="keyword">$this</span>->getSlice(), $firstSlice), <span class="keyword">$this</span>->passable</span><br><span class="line"> );</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">protected</span> <span class="function"><span class="keyword">function</span> <span class="title">getSlice</span><span class="params">()</span></span></span><br><span class="line"><span class="function"> </span>{</span><br><span class="line"> <span class="keyword">return</span> <span class="function"><span class="keyword">function</span> <span class="params">($stack, $pipe)</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> <span class="function"><span class="keyword">function</span> <span class="params">($passable)</span> <span class="title">use</span> <span class="params">($stack, $pipe)</span> </span>{</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> ($pipe <span class="keyword">instanceof</span> Closure) {</span><br><span class="line"> <span class="keyword">return</span> call_user_func($pipe, $passable, $stack);</span><br><span class="line"> } <span class="keyword">else</span> {</span><br><span class="line"> <span class="keyword">list</span>($name, $parameters) = <span class="keyword">$this</span>->parsePipeString($pipe);</span><br><span class="line"> <span class="comment">//$this->method = handle; 方法</span></span><br><span class="line"> <span class="comment">// $name 即中间类名,通过容器获取实例</span></span><br><span class="line"> <span class="keyword">return</span> call_user_func_array([<span class="keyword">$this</span>->container->make($name), <span class="keyword">$this</span>->method],</span><br><span class="line"> array_merge([$passable, $stack], $parameters));</span><br><span class="line"> }</span><br><span class="line"> };</span><br><span class="line"> };</span><br><span class="line"> }</span><br><span class="line"> <span class="comment">//最内层，将请求分发至路由的闭包</span></span><br><span class="line"> <span class="keyword">protected</span> <span class="function"><span class="keyword">function</span> <span class="title">getInitialSlice</span><span class="params">(Closure $destination)</span></span></span><br><span class="line"><span class="function"> </span>{ </span><br><span class="line"> <span class="keyword">return</span> <span class="function"><span class="keyword">function</span> <span class="params">($passable)</span> <span class="title">use</span> <span class="params">($destination)</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> call_user_func($destination, $passable);</span><br><span class="line"> };</span><br><span class="line"> }</span><br></pre></td></tr></table></figure></p>
<p>所有的焦点都聚集到最终返回响应的路由。下篇分析 $this->router->dispatch($request)。</p>
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