php + redis 实现关注功能

产品价值

1: 关注功能
2: 功能分析之“关注”功能
3: 平平无奇的「关注」功能，背后有4点重大价值

应用场景

在做PC或者APP端时，掺杂点社交概念就有关注和粉丝功能;
数据量小的话数据库还能支持，如果数据量很庞大还是用缓存比较好。

具体实现

1 控制层实现

<?php

namespace AppControllerTest;

use AppControllerAbstractController;
use AppServicePtgTestFollowService;
use HyperfDiAnnotationInject;
use HyperfHttpServerAnnotationController;
use HyperfHttpServerAnnotationMiddleware;
use HyperfHttpServerAnnotationRequestMapping;

/**
 * 测试 - 关注
 * Class TestFollowController
 * @package AppController
 * @Controller(prefix="test")
 */
class TestFollowController extends AbstractController
{
    /**
     * 服务层 - 关注
     * @Inject()
     * @var TestFollowService
     */
    protected $testFollowService;

    /**
     * 关注/取消关注
     * @param Request $request
     * @return mixed
     */
    public function follow(Request $request)
    {
        $type = $request->input('type', 'follow');         // 1-关注-follow 2-取消关注-remove
        $userId = $request->input('user_id', 0);    // 我的用户ID
        $otherId = $request->input('other_id', 0);  // 我关注的用户ID
        if ($userId == $otherId) {
            return $this->response->apiResponse();
        }
        $this->testFollowService->follow($type, $userId, $otherId);
        return $this->response->apiResponse();
    }

    /**
     * 我的关注/粉丝
     * @param Request $request
     * @return mixed
     */
    public function myFollowAndFans(Request $request)
    {
        $type = $request->input('type', 'follow');  // 1-关注-follow 2-粉丝-fans
        $userId = $request->input('user_id', 0);    // 我的用户ID
        $page = $request->input('page', 1);         // 页码
        $limit = $request->input('limit', 10);      // 每页显示条数
        $res = $this->testFollowService->myFollowAndFans($userId, $type, $page, $limit);
        return $this->response->apiResponse($res);
    }
}
?>

2 服务层实现

<?php

namespace AppServicePtg;

use AppRepositoryRedisTestFollowRedis;
use AppServiceAbstractService;
use HyperfDiAnnotationInject;

class TestFollowService extends AbstractService
{
    /**
     * 仓储层 - 关注
     * @Inject()
     * @var TestFollowRedis
     */
    protected $testFollowRedis;

    /**
     * 关注/取消关注
     * @param string $type
     * @param int $userId
     * @param int $otherId
     * @return mixed
     */
    public function follow($type = 'follow', int $userId, int $otherId)
    {
        // 关注
        if ($type === 'follow') {
            // 先处理 mysql
            // TODO mysql 操作
            // 然后处理 redis
            $this->testFollowRedis->zAddFollow($userId, $otherId);
            $this->testFollowRedis->zAddFans($otherId, $userId);
        }
        // 取消关注
        if ($type === 'remove') {
            // 先处理 mysql
            // TODO mysql 操作
            // 然后处理 redis
            $this->testFollowRedis->zRemFollow($userId, $otherId);
            $this->testFollowRedis->zRemFans($otherId, $userId);
        }
    }

    /**
     * 我的关注/粉丝
     * @param int $userId 当前登录用户的ID
     * @param string $type 要获取的数据
     * @param int $page 页码
     * @param int $limit 限制条数
     * @return array
     */
    public function myFollowAndFans(int $userId, $type = 'follow', $page = 1, $limit = 10)
    {
        $start = $limit * ($page - 1);
        $end = $start + $limit - 1;
        $res = [];
        if ($type === 'follow') {
            $res = $this->testFollowRedis->zRangeFollow($userId, $start, $end);
        }
        if ($type === 'fans') {
            $res = $this->testFollowRedis->zRangeFans($userId, $start, $end);
        }
        return $res;
    }
}
?>

仓储层实现

<?php

namespace AppRepositoryRedis;

class TestFollowRedis extends AbstractRedis
{
    /**
     * 关注key
     * @var string
     */
    private $followKey = '%u:follow';

    /**
     * 粉丝key
     * @var string
     */
    private $fansKey = '%u:fans';

    /**
     * 前缀
     */
    public function initPrefix()
    {
        return 'follow:';
    }

    /**
     * 增加关注
     * @param $userId
     * @param $otherId
     */
    public function zAddFollow($userId, $otherId)
    {
        $this->redis->zAdd(sprintf($this->prefix . $this->followKey, $userId), time(), $otherId);
    }

    /**
     * 取消关注
     * @param $userId
     * @param $otherId
     */
    public function zRemFollow($userId, $otherId)
    {
        $this->redis->zRem(sprintf($this->prefix . $this->followKey, $userId), $otherId);
    }

    /**
     * 我的关注 | 正序
     * @param int $userId
     * @param int $start
     * @param int $end
     * @return array
     */
    public function zRangeFollow(int $userId, int $start = 0, int $end = 9)
    {
        return $this->redis->zRange(sprintf($this->prefix . $this->followKey, $userId), $start, $end);
    }

    /**
     * 我的关注 | 倒序
     * @param int $userId
     * @param int $start
     * @param int $end
     * @return array
     */
    public function zRevRangeFollow(int $userId, int $start = 0, int $end = 9)
    {
        return $this->redis->zRevRange(sprintf($this->prefix . $this->followKey, $userId), $start, $end);
    }

    /**
     * 增加粉丝
     * @param $userId
     * @param $otherId
     */
    public function zAddFans($userId, $otherId)
    {
        $this->redis->zAdd(sprintf($this->prefix . $this->fansKey, $userId), time(), $otherId);
    }

    /**
     * 移除粉丝
     * @param $userId
     * @param $otherId
     */
    public function zRemFans($userId, $otherId)
    {
        $this->redis->zRem(sprintf($this->prefix . $this->fansKey, $userId), $otherId);
    }

    /**
     * 我的粉丝 | 正序
     * @param int $userId
     * @param int $start
     * @param int $end
     * @return array
     */
    public function zRangeFans(int $userId, int $start = 0, int $end = 9)
    {
        return $this->redis->zRange(sprintf($this->prefix . $this->fansKey, $userId), $start, $end);
    }

    /**
     * 我的粉丝 | 倒序
     * @param int $userId
     * @param int $start
     * @param int $end
     * @return array
     */
    public function zRevRangeFans(int $userId, int $start = 0, int $end = 9)
    {
        return $this->redis->zRevRange(sprintf($this->prefix . $this->fansKey, $userId), $start, $end);
    }
}