访问容器功能的最佳设计方法

Question

我是SLIM3的新手,并按照教程在容器中获取我想从代码中的任何位置访问的一些函数.所以这是我的index.php文件,我在那里推荐一切:

<?php
use \Psr\Http\Message\ServerRequestInterface as Request;
use \Psr\Http\Message\ResponseInterface as Response;

// Require for loading the vendor libraries installed by composer
require 'vendor/autoload.php';


$config['displayErrorDetails'] = true;
$config['addContentLengthHeader'] = false;

$app = new \Slim\App(["settings" => $config]);
$container = $app->getContainer();

// Monolog initalisation. To use it write: $this->logger->addInfo("what you want to write here");
$container['logger'] = function($c) {
    $logger = new \Monolog\Logger('eq_logger');
    $file_handler = new \Monolog\Handler\StreamHandler("logs/app.log");
    $logger->pushHandler($file_handler);
    return $logger;
};

// Database connections
$container['dbteacher'] = function ($c) {
    $pdo = new PDO($_SERVER['PGSQL_CONNECTION_STR']);
    $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    $pdo->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC);
    return $pdo;
};
$container['dbagent'] = function ($c) {
    $pdo = new PDO($_SERVER['PGSQL_CONNECTION_STR_AGENT']);
    $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    $pdo->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC);
    return $pdo;
};

$app->post('/{controller}/{function}', function (Request $request, Response $response) {
    $headers = $request->getHeaders();
    $params = $request->getParsedBody();

    $classname = $request->getAttribute('controller');
    $controller = new $classname($this->logger);
    $function = $request->getAttribute('function');

    $result = $controller->$function($params);

    $response->getBody()->write($result);
    return $response;
});

$app->run();

在这里我可以logger通过输入进行访问$this->logger,同样适用于dbteacher和dbagent,但我只能在创建这些容器的地方进行访问,当我从另一个类调用另一个函数时,我希望能够访问它们但我不能我想在参数中传递它们,因为这很难维护,我也想要有一个config.php类,它可以将这些容器和$app变量初始化并在我使用的每个类中扩展它,但听起来不对.什么是最好的方法来解决这个问题？

Answer 1

您应该使用Slim3使用的依赖注入容器(Pimple)的功能.

话虽这么说,我想说动态创建"控制器"并不是那么好,抽象不应该存在,你应该只做$response->getBody()->write($result);或$response->write($result);每个控制器中更简单的方法.此外,我不明白为什么这个结构需要一个完整的路由框架.

但无论如何,如果你想继续使用该解决方案,你可以使用Pimple,我将在一个例子中解释.

你有几个具有不同构造函数参数的类:

class A {
    public function __construct($logger) {}
}

class B {
    public function __construct($logger, $myHelper) {}
}

首先,将它们全部添加到Pimple容器中:

$container['A'] = function($c) { // or $container[A::class] for type safety
    return new A($c['logger']);
};
$container['B'] = function($c) {
    return new A($c['logger'], $c['myHelper']);
};

然后,您可以通过调用app实例上的容器来获取它们.

$app->post('/{controller}/{function}', function (Request $request, Response $response) {
    $headers = $request->getHeaders();
    $params = $request->getParsedBody();

    $classname = $request->getAttribute('controller');
    $controller = $this->getContainer()->get($classname);
    $function = $request->getAttribute('function');

    $result = $controller->$function($params);

    $response->getBody()->write($result);
    return $response;
});