[12.x] keys for PredisClusterConnection

Author: vadimonus

src/Illuminate/Redis/Connections/PredisClusterConnection.php

@@ -35,4 +35,19 @@ public function flushAll()
             $node->executeCommand(tap(new FLUSHALL())->setArguments(func_get_args()));
         }
     }
+
+    /**
+     * Returns the keys that match a certain pattern.
+     *
+     * @param  string  $pattern
+     * @return array
+     */
+    public function keys(string $pattern)
+    {
+        $keys = [];
+        foreach ($this->client as $node) {
+            $keys[] = $node->keys($pattern);
+        }
+        return array_merge(...$keys);
+    }
 }