6

我的网站上有一些自定义社交按钮,我使用 API 中的 json 获取分享号/关注者号。我试图实现一个缓存系统来减少加载时间并消除因过度使用 API 而被“警告”的风险。但是,我在这方面没有成功,主要是因为我不太了解集成步骤。我希望有人可以帮助我集成缓存系统。

以下是 Twitter、Google Plus 和 Instagram 的 php 代码:

  • 推特
    ob_start();
    $twittershare = 'http://cdn.api.twitter.com/1/urls/count.json?url='.$product["href"] .'';

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $twittershare);
    curl_setopt($ch, CURLOPT_HEADER, 0);
    $jsonstring = curl_exec($ch);
    curl_close($ch);
    $bufferstr = ob_get_contents();
    ob_end_clean();
    $json = json_decode($bufferstr);

    回声$json->计数;

  • 谷歌加
    $url = ''.$product["href"] .'';

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, "https://clients6.google.com/rpc?key=xxxxxxxxxx");
    curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_POSTFIELDS, '[{"method":"pos.plusones.get","id":"p","params":{"nolog":true,"id":"' . $url '","source":"widget","userId":"@viewer","groupId":"@self"},"jsonrpc":"2.0","key":"p","apiVersion" :"v1"}]');
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-type: application/json'));
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    $curl_results = curl_exec($ch);
    curl_close($ch);
    $json = json_decode($curl_results, true);
    $count = intval($json[0]['result']['metadata']['globalCounts']['count']);
    $数据 = 数组();
    $data['plus_count'] = (string) $count;
    $data['url'] = $url;
    回声 $data['plus_count'];

  • Instagram(获取关注者号码)
    ob_start();
    $insta = 'https://api.instagram.com/v1/users/00000000?access_token={token}';

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $insta);
    curl_setopt($ch, CURLOPT_HEADER, 0);
    $jsonstring = curl_exec($ch);
    curl_close($ch);
    $bufferstr = ob_get_contents();
    ob_end_clean();
    $json = json_decode($bufferstr);

    echo $json->data->counts->followed_by;

希望大家可以一步步指导我如何为上面的代码片段实现缓存系统。

4

1 回答 1

5

好吧,正如我在评论中提到的,我将使用Memcached和一个数据库,但我将起草一个仅数据库的解决方案(使用 PDO 用于 twitter)并将 Memcached 部分作为奖励练习留给您。;) 我会通过 AJAX 加载关注者信息,以减少页面加载时间,例如需要更新关注者数量。

我将使用以下数据库架构:

CREATE TABLE IF NOT EXISTS `Followers` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `url` varchar(100) NOT NULL,
  `data` longtext NOT NULL,
  `followers` int(5) NOT NULL,
  `last_update` TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB  DEFAULT CHARSET=utf8;

首先我会定义一个接口,这样你就不会依赖任何实现:

interface SocialFollowers
{
    public function getFollowers();
}

然后,对于 twitter 共享 API,我将有一个实现类,它获取数据库句柄和用于初始化的目标 URL。类属性由检索到的数据(如果可用)填充。如果时间戳足够新,您将立即获得关注者数量,否则查询 API,存储结果,然后检索关注者数量。

class TwitterFollowers implements SocialFollowers
{
    private $data = null;
    private $url = "";
    private $db = null;
    private $followers = null;

    protected $shareURL = "https://cdn.api.twitter.com/1/urls/count.json?url=";

    public function __construct($db, $url) {
        // initialize the database connection here
        // or use an existing handle
        $this->db = $db;

        // store the url
        $this->url = $url;

        // fetch the record from the database
        $stmt = $this->db->prepare('SELECT * FROM `Followers` WHERE url = :url ORDER BY last_update DESC LIMIT 1');
        $stmt->bindParam(":url", $url);
        $stmt->execute();

        $this->data = $stmt->fetch(PDO::FETCH_ASSOC);
        if (!empty($this->data))
            $this->followers = $this->data["followers"];
    }

    public function getFollowers()
    {
        // create a timestamp that's 30 minutes ago
        // if it's newer than the value from the database -> call the api
        $old = new DateTime();
        $old->sub(new DateInterval("PT30M"));

        if (is_null($this->followers) || (new DateTime($this->data["last_update"]) < $old) ) {
            return $this->retrieveFromAPI();
        }

        return $this->followers;
    }

    private function retrieveFromAPI()
    {
        // mostly untouched
        ob_start();
        $twittershare = $this->shareURL . $this->url;

        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $twittershare);
        curl_setopt($ch, CURLOPT_HEADER, 0);
        $jsonstring = curl_exec($ch);
        curl_close($ch);
        $bufferstr = ob_get_contents();
        ob_end_clean();
        $json = json_decode($bufferstr);

        $this->followers = $json->count;

        // store the retrieved values in the database
        $stmt = $this->db->prepare('INSERT INTO Followers (url, data, followers)'
            .'VALUES (:url, :data, :followers)');
        $stmt->execute(array(
            ":url" => $this->url,
            ":data" => $bufferstr,
            ":followers" => $this->followers
        ));

        return $this->followers;
    }
}

对于 Facebook、Google+、the-next-social-network,您只需要添加另一个实现。

请记住,此代码未经测试。它错过了一些 PDO 查询的 try/catch 块,并且还有改进的空间(例如:缺少某种锁定机制来防止同时检索相同的 URL,是否有必要存储返回的 blob 等)。

希望这对您有所帮助。

[编辑] 我稍微更新了代码(修复了一些拼写错误和转换问题)并对其进行了测试。你可以在github找到一个工作版本。所缺少的只是 ajax 片段(假设 jQuery)

$.ajax({
    url: "http://example.com/twitter.php",
    type: "get",
    data: {url: "http://stackoverflow.com"}
    success: function(data, textStatus, jqXHR) {
        // Update the corresponding counter like
        // $("#twitterfollowers").text(data);
        console.log(data);
    }
});
于 2013-09-29T22:33:32.273 回答