如何列出Laravel和Redis中的所有登錄用戶？

Question

我目前正在Laravel（5.3）上製作應用程序，並要求列出所有登錄用戶。我原本打算將它們存儲在MySQL中，但被告知Redis會更適合這項工作。一旦我查看Redis文檔，我將把所有用戶存儲在一個集合中，但後來意識到您無法爲單個成員設置過期時間，因此選擇了命名空間字符串。

我寫了一些代碼，我相信它運行正常，但想要改善它/解決任何可能出現的問題的建議。

因此，首先，這裏有兩個功能我LoginController.php

// Overriding the authenticated method from Illuminate\Foundation\Auth\AuthenticatesUsers 
protected function authenticated(Request $request, $user) 
{ 
    $id = $user->id; 

    // Getting the expiration from the session config file. Converting to seconds 
    $expire = config('session.lifetime') * 60; 

    // Setting redis using id as namespace and value 
    Redis::SET('users:'.$id,$id); 
    Redis::EXPIRE('users:'.$id,$expire); 
} 

//Overriding the logout method from Illuminate\Foundation\Auth\AuthenticatesUsers 
public function logout(Request $request) 
{ 
    // Deleting user from redis database when they log out 
    $id = Auth::user()->id; 
    Redis::DEL('users:'.$id); 

    $this->guard()->logout(); 

    $request->session()->flush(); 

    $request->session()->regenerate(); 

    return redirect('/'); 
} 

接下來加入我寫的中間件，以刷新Redis的到期當用戶做一些事情，刷新稱爲「RefreshRedis」他們會話。

public function handle($request, Closure $next) 
{ 
    //refreshing the expiration of users key 
    if(Auth::check()){ 
     $id = Auth::user()->id; 
     $expire = config('session.lifetime') * 60; 
     Redis::EXPIRE('users:'.$id,$expire); 
    } 
    return $next($request); 
} 

我再註冊在$ middlewareGroups中間件只是StartSession中間件

protected $middlewareGroups = [ 
    'web' => [ 
     \App\Http\Middleware\EncryptCookies::class, 
     \Illuminate\Cookie\Middleware\AddQueuedCookiesToResponse::class, 
     \Illuminate\Session\Middleware\StartSession::class, 
     \App\Http\Middleware\RefreshRedis::class, 
     \Illuminate\View\Middleware\ShareErrorsFromSession::class, 
     \App\Http\Middleware\VerifyCsrfToken::class, 
     \Illuminate\Routing\Middleware\SubstituteBindings::class, 
    ], 

    'api' => [ 
     'throttle:60,1', 
     'bindings', 
    ], 
]; 

後，爲了讓所有我以前在this線程發現功能的修改版本的用戶列表。

class Team extends AbstractWidget 
{ 

/** 
* Treat this method as a controller action. 
* Return view() or other content to display. 
*/ 
public function run() 
{ 
    //Find all logged users id's from redis 
    $users = $this->loggedUsers('users:*'); 

    return view('widgets.team',compact('users')); 
} 


protected function loggedUsers($pattern, $cursor=null, $allResults=array()) 
{ 
    // Zero means full iteration 
    if ($cursor==="0"){ 
     $users = array(); 

     foreach($allResults as $result){ 
      $users[] = User::where('id',Redis::Get($result))->first(); 
     } 
     return $users; 
    } 

    // No $cursor means init 
    if ($cursor===null){ 
     $cursor = "0"; 
    } 

    // The call 
    $result = Redis::scan($cursor, 'match', $pattern); 

    // Append results to array 
    $allResults = array_merge($allResults, $result[1]); 

    // Get rid of duplicated values 
    $allResults = array_unique($allResults); 

    // Recursive call until cursor is 0 
    return $this->loggedUsers($pattern, $result[0], $allResults); 
} 
} 

Answer 1

可以通過使用[多]命令，將最終確定用[EXEC]命令某些Redis的命令（S）到期Redis的組密鑰。

protected function authenticated(Request $request, $user) 
{ 
    $id = $user->id; 

    // Getting the expiration from the session config file. Converting  to seconds 
    $expire = config('session.lifetime') * 60; 

    // In using the [multi] and [exec] command 
    $oLibRedis = $this->callRedisLibrary(); // Initialize your Predis\Client class on this method 
    $oLibRedis->multi(); 
    $oLibRedis->set('users:'.$id, $id); 
    $oLibRedis->expire('users:'.$id, $expire); 
    $oLibRedis->get('users:'.$id); 
    $aResults = $oLibRedis->exec(); 
    return $aResults 
} 

它將從中產生ff。結果

array（3）{[0] => object（Predis \ Response \ Status）＃224（1）{[「payload」：「Predis \ Response \ Status」：private] => string（ 2）「OK」} [1] => int（1）[2] => string（5）「admin」}

結果將根據您調用的命令顯示爲數組遠在Redis上（例如設置，過期和獲取命令）

當您想要檢查會話是否過期或來自其他控制器時。您可以在Redis中使用[ttl]命令。

$sRedisUserKey = $oLibRedis->ttl($sSampleUserKey); // int(7184) 

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