Magento资源问题上CDN方案研究，magento资源cdn方案

Magento资源问题上CDN方案研究，magento资源cdn方案

  通过对Magento的了解，发现Magento的资源文件主要分布在media、js、skin三个文件夹里，media文件夹主要包括了系统自带编辑器WYSIWYG Editor 所有编辑器涉及到的资源（Static Blocks、Pages、Product Intro、Product Images）以及Magento自主生成的媒体资源  （包含了我们允许用户上传文件的文件夹）；skin文件夹主要是模板提供的样式、图片、js资源（一般我们对模板再次改造时会改到这个文件夹里的资源）；js文件夹包括Magento官方的prototype、varien、scriptaculous、mage等js库以及附属资源（一般我们不会去动这个文件夹），这三个文件夹所包含的全部都是静态资源（图片、js、css、字体、文档等） 也就是我们可以CDN的文件

  通过对Magento源码的观察，网站公开方法getBaseUrl  AT  app/core/Mage/Core/Model/Store.php

<span>public</span> <span>function</span> getBaseUrl(<span>$type</span> = self::URL_TYPE_LINK, <span>$secure</span> = <span>null</span><span>)
{
    </span><span>$cacheKey</span> = <span>$type</span> . '/' . (<span>is_null</span>(<span>$secure</span>) ? 'null' : (<span>$secure</span> ? 'true' : 'false'<span>));
    </span><span>if</span> (!<span>isset</span>(<span>$this</span>->_baseUrlCache[<span>$cacheKey</span><span>])) {
        </span><span>switch</span> (<span>$type</span><span>) {
            </span><span>case</span> self::URL_TYPE_WEB:
                <span>$secure</span> = <span>is_null</span>(<span>$secure</span>) ? <span>$this</span>->isCurrentlySecure() : (bool)<span>$secure</span><span>;
                </span><span>$url</span> = <span>$this</span>->getConfig('web/' . (<span>$secure</span> ? 'secure' : 'unsecure') . '/base_url'<span>);
                </span><span>break</span><span>;

            </span><span>case</span> self::URL_TYPE_LINK:
                <span>$secure</span> = (bool) <span>$secure</span><span>;
                </span><span>$url</span> = <span>$this</span>->getConfig('web/' . (<span>$secure</span> ? 'secure' : 'unsecure') . '/base_link_url'<span>);
                </span><span>$url</span> = <span>$this</span>->_updatePathUseRewrites(<span>$url</span><span>);
                </span><span>$url</span> = <span>$this</span>->_updatePathUseStoreView(<span>$url</span><span>);
                </span><span>break</span><span>;

            </span><span>case</span> self::URL_TYPE_DIRECT_LINK:
                <span>$secure</span> = (bool) <span>$secure</span><span>;
                </span><span>$url</span> = <span>$this</span>->getConfig('web/' . (<span>$secure</span> ? 'secure' : 'unsecure') . '/base_link_url'<span>);
                </span><span>$url</span> = <span>$this</span>->_updatePathUseRewrites(<span>$url</span><span>);
                </span><span>break</span><span>;

            </span><span>case</span> self::URL_TYPE_SKIN:
            <span>case</span> self::URL_TYPE_JS:
                <span>$secure</span> = <span>is_null</span>(<span>$secure</span>) ? <span>$this</span>->isCurrentlySecure() : (bool) <span>$secure</span><span>;
                </span><span>$url</span> = <span>$this</span>->getConfig('web/' . (<span>$secure</span> ? 'secure' : 'unsecure') . '/base_' . <span>$type</span> . '_url'<span>);
                </span><span>break</span><span>;

            </span><span>case</span> self::URL_TYPE_MEDIA:
                <span>$url</span> = <span>$this</span>->_updateMediaPathUseRewrites(<span>$secure</span><span>);
                </span><span>break</span><span>;

            </span><span>default</span>:
                <span>throw</span> Mage::<span>exception</span>('Mage_Core', Mage::helper('core')->__('Invalid base url type'<span>));
        }

        </span><span>if</span> (<span>false</span> !== <span>strpos</span>(<span>$url</span>, '{{base_url}}'<span>)) {
            </span><span>$baseUrl</span> = Mage::getConfig()->substDistroServerVars('{{base_url}}'<span>);
            </span><span>$url</span> = <span>str_replace</span>('{{base_url}}', <span>$baseUrl</span>, <span>$url</span><span>);
        }

        </span><span>$this</span>->_baseUrlCache[<span>$cacheKey</span>] = <span>rtrim</span>(<span>$url</span>, '/') . '/'<span>;
    }

    </span><span>return</span> <span>$this</span>->_baseUrlCache[<span>$cacheKey</span><span>];
}</span>

 

URL_TYPE_MEDIA的获取方式更复杂些 我们也看看写了什么

<span>protected</span> <span>function</span> _updateMediaPathUseRewrites(<span>$secure</span> = <span>null</span>, <span>$type</span> = self::<span>URL_TYPE_MEDIA)
{
    </span><span>$secure</span> = <span>is_null</span>(<span>$secure</span>) ? <span>$this</span>->isCurrentlySecure() : (bool) <span>$secure</span><span>;
    </span><span>$secureStringFlag</span> = <span>$secure</span> ? 'secure' : 'unsecure'<span>;
    </span><span>$url</span> = <span>$this</span>->getConfig('web/' . <span>$secureStringFlag</span> . '/base_' . <span>$type</span> . '_url'<span>);
    </span><span>if</span> (!<span>$this</span>->getConfig(self::<span>XML_PATH_USE_REWRITES)
        </span>&& Mage::helper('core/file_storage_database')-><span>checkDbUsage()
    ) {
        </span><span>$urlStart</span> = <span>$this</span>->getConfig('web/' . <span>$secureStringFlag</span> . '/base_url'<span>);
        </span><span>$url</span> = <span>str_replace</span>(<span>$urlStart</span>, <span>$urlStart</span> . self::MEDIA_REWRITE_SCRIPT, <span>$url</span><span>);
    }
    </span><span>return</span> <span>$url</span><span>;
}</span>

 

我们可以发现所有$type 类型的 始终会从 getConfig(string configPath)  中获得，所获得保存数据库 在后台 configuration -> general Web -> Unsecure & Secure 里可以配置修改。

假设把Magento整站当做CDN源服务器，再把BASE_MEDIA_URL、BASE_SKIN_URL、BASE_JS_URL的值改成CDN的地址，是不是就对Magento的资源进行了CDN处理了呢，于是我就先把本地的机器装上了Magento来测试一番（俗话说实践是检验真理的唯一方法），由于CDN需要域名解析，我们暂时不理会也不去搞CDN，但是我们可以用重定向一个新域名来代表这个CDN，比如 hosts里加两个域名用来测试

  <span>127.0</span>.<span>0.1</span><span>       magento.yourdomain.com
  </span><span>127.0</span>.<span>0.1</span>       mage-cdn.yourdomain.com

Nginx里把原来magento.yourdomain.com的配置复制一份并删除php解析那一段保证安全。顺便在资源那加入尽可能多的资源类型（以后不够还可以再加）

重启nginx，然后登陆Magento后台 把 BASE_MEDIA_URL、BASE_SKIN_URL、BASE_JS_URL 中原来的 {{base_unsecure_url}} 都改成 http://mage-cdn.yourdomain.com/ 、{{base_secure_url}} 都改成 https://mage-cdn.yourdomain.com/ 然后保存设置  重新刷下Magento缓存 OK 大功告成。

打开http://magento.yourdomain.com/ 试试，诶 假设你用了别的模板，里面加了很多字体，你可能会看到有跨域访问的错误提示：

Font from origin <span>'</span><span>https://mage-cdn.yourdomain.com</span><span>'</span> has been blocked from loading by Cross-Origin Resource Sharing policy: No <span>'</span><span>Access-Control-Allow-Origin</span><span>'</span> header is present on the requested resource. Origin <span>'</span><span>https://magento.yourdomain.com</span><span>'</span> is therefore <span>not</span> allowed access.

他告诉你magento的站点想访问mage-cdn的一些资源但是由于没有Access-Control-Allow-Origin 头，所以我们在nginx配置mage-cdn站点里资源文件访问时统一加上 add_header Access-Control-Allow-Origin https://magento.yourdomain.com. 为什么不用*呢，假如你很大方的想别的网站也能跨域访问你的资源那你就使用*吧，我是建议那里用的绑哪里，呵呵

然后我们在打开Magento站点 进行各种测试 注册 登陆 下单 上传 后台各种编辑 OK 这次我们真的大功告成了。

加下来就是部署CDN了，登陆CDN服务商，直接将源站点设置为你的 magento.yourdomain.com  一般CDN都提供CNAME服务，那么你大方的解析一个cdn.yourdomain.com CNAME给 CDN服务商提供给你的地址 abcd.xxxx.com ,一般CDN服务商也同样提供headers 的添加 你可以为这个CDN添加需要headers，就是我们需要的跨域请求。再就是配置Magento 然后blablabla 最后你想办法让CDN服务商用你的crt证书。OK 这下可以搞定了