getting locale language at provider class in laravel

I'm new at laravel , and trying to make the variable of content at the header shared with all views , but the issue is with getting the language which backing with me with null value at the provider ( AppServiceProvider ) class :

and here's my code :

 public function boot( )
    {
           // $language=App::setLocale($locale);
            $locale = App::getLocale();
             \Session::put('language', 'en');
            \Config::get('app.locale');
            \Config::get('languages') ;
            \Session::get('languages', 'en');
               $lang = Session::get ('locale');


               $products = ProductsTranslation::join('products', 'products.id', '=', 'products_translations.product_id')->where('language',$lang) ->get();




           $postId   = Post::get();
            view()->share('products', $products,'language',' \Session::get("language", $locale )','postId',$postId);    
    }

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