使用Predis写博客类熟悉redis的String类型命令操作

基于Predis熟悉String类型命令

---

client = new Predis\Client([
            'scheme' => 'tcp',
            'host' => '127.0.0.1',
            'port' => 6379
        ]);
        // 进行连接异常处理

    }

    /**
     * 生成blog的id（唯一ID生成器）
     */
    private function createBlogId() {
        return $this->client->incr('publishBlog');
    }
    /**
     * 组装部分key前缀
     */
    public function headlePrefix($id, $prefix = "") {
        if(!$prefix) {
            $prefix = "article:" . $id . ":";
        }
        return $prefix;
    } 

    /**
     * 发布blog(锁)
     */
    public function publishBlog($title, $content, $author) {
        $id = $this->createBlogId();
        $pre = $this->headlePrefix($id);
        $data = [
            $pre . "title" => $title,
            $pre . "content" => $content,
            $pre . "author" => $author,
            $pre . "createTime" => date("Y-m-d H:i:s"),
            $pre . "updateTime" => "",
            $pre . "likes" => 0,
            $pre . "views" => 0,
        ];
        return $this->client->msetnx($data);
    }

    /**
     * 更新blog
     */
    public function updateBlog($id, $title, $content)
    {
        $pre = $this->headlePrefix($id);
        $data = [
            $pre . "title" => $title,
            $pre . "content" => $content,
            $pre . "updateTime" => date("Y-m-d H:i:s"),
        ];
        return $this->client->mset($data);
    }

    /**
     * 查看blog
     */
    public function seeBlogDetail($id, $userId) {
        $pre = $this->headlePrefix($id);

        if($this->client->get($pre . "title")) {
            $this->client->incrby($pre . "views", 1);
        }
    
        $key = [
            $pre . "title" ,
            $pre . "content",
            $pre . "author",
            $pre . "createTime",
            $pre . "likes",
            $pre . "views"
        ];
        $this->operationLog($id, $userId, __FUNCTION__);
        return $this->client->mget($key);
    }

    // 点赞blog
    public function likeBlog($id, $userId) {
        $pre = $this->headlePrefix($id);
        $this->operationLog($id, $userId, __FUNCTION__);
        return $this->client->incr($pre . "likes");
    }

    /**
     * 删除blog
     */
    public function deleteBlog($id) {
        $pre = $this->headlePrefix($id);
        $data = [
            $pre . "title",
            $pre . "content",
            $pre . "author",
            $pre . "createTime",
            $pre . "updateTime",
            $pre . "likes",
            $pre . "views",
        ];
        return $this->client->del($data);
    }

    /**
     * 获取blog长度
     */
    public function getBlogLength($id) {
        $pre = $this->headlePrefix($id);
        $length = $this->client->strlen($pre . "content");
        return $length;
    }   

    /**
     * 预览blog
     */
    public function previewBlog($id, $userId) {
        $pre = $this->headlePrefix($id);
        $length = $this->client->getrange($pre . "content", 0, 24);
        $this->operationLog($id, $userId, __FUNCTION__);
        return $length;
    }

    /**
     * 操作日志
     */
    public function operationLog($id, $userId, $methodName){
        $pre = $this->headlePrefix($id);
        $title = $this->client->get($pre . "title");
        $op = [
            "previewBlog" => "预览",
            "likeBlog" => "点赞",
            "seeBlogDetail" => "查看",
        ];
        // 用户对blog文章操作了什么。
        $log = "[" . date("Y-m-d H:i:s") . " user:" . $userId . "对<" . $title .
               "> 进行了" . $op[$methodName] . " ]";
        $this->client->append($pre . "log", $log);
    }
    
    /**
     * 获取用户对文章的操作记录
     */
    public function getArticleLog($id) {
        $pre = $this->headlePrefix($id);
        return $this->client->get($pre . "log");
    }
}