redis - 拉维尔 : How to Check Redis Availability?

Question

如何在 Laravel 5.4 中检查 Redis 连接的可用性。我尝试了下面的代码，但 ping 线出现异常。如果没有连接 Redis，我该怎么做才能避免异常？

No connection could be made because the target machine actively refused it. [tcp://127.0.0.1:6379]

use Redis;

class SocketController extends Controller
{
    public function sendMessage(){
        $redis = Redis::connection();

        if($redis->ping()){
            print_r("expression");
        }
        else{
            print_r("expression2");
        }
    }
}

也试过这个:

$redis = Redis::connection();
        try{
            $redis->ping();
        } catch (Exception $e){
            $e->getMessage();
        }

但无法捕获异常

Answer 1

如果你正在使用 predis ，那么它会抛出 Predis\Connection\ConnectionException

Error while reading line from the server. [tcp://127.0.0.1:6379] <--when redis is not connected

所以捕获那个异常，你会知道你的 redis 是否连接。

use Illuminate\Support\Facades\Redis;

    public function redis_test(Request $request){
    try{
        $redis=Redis::connect('127.0.0.1',3306);
        return response('redis working');
    }catch(\Predis\Connection\ConnectionException $e){
        return response('error connection redis');
    }