Question

我的网站上有一些自定义社交按钮，我可以使用API中的json获取共享编号/关注者编号。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“标记为红色”的风险。但是，我在这方面没有成功，主要是因为我不太了解整合步骤。我希望有人可以帮我集成缓存系统。

以下是Twitter，Google Plus和Instagram的PHP代码：

Twitter


    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);

    echo $json->count;

Google Plus


    $url = ''.$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']);
    $data = array();
    $data['plus_count'] = (string) $count;
    $data['url'] = $url;
    echo $data['plus_count'];

Instagram（取得粉丝编号）


    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;

希望你们能够一步一步地指导我如何为上面的代码片段实现缓存系统。

Answer 1

好吧，正如我在评论中所提到的，我会使用Memcached和一个数据库，但是我将草拟一个仅限数据库的解决方案（使用PDO for twitter）并将Memcached部分作为奖励练习。 ;）我会通过AJAX加载关注者信息，以减少页面加载时间，例如追随者数量需要更新。

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，我定义了一个接口，因此您不依赖于任何实现：

interface SocialFollowers
{
    public function getFollowers();
}

然后，对于twitter共享API，我有一个实现类，它获取数据库句柄和初始化的目标URL。使用检索到的数据（如果可用）填充类属性。如果时间戳足够新，您将立即获得关注者数量，否则将查询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 +，下一个社交网络，您只需添加其他实施。

请注意，此代码未经过测试。它错过了PDO查询的一些try / catch块，并且还有改进的余地（例如：缺少某种锁定机制以防止同时检索同一URL，是否需要存储返回的blob等）。 / p>

希望这会对你有所帮助。

[edit]我稍微更新了代码（修正了一些拼写错误和转换问题）并对其进行了测试。您可以在github找到工作版本。所有缺少的是ajax片段（假设jQuery），如

$.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);
    }
});

如何在php中为json api实现缓存系统

1 个答案: