Symfony/Doctrine:Wie bringt man Doctrine dazu, mit Unix-Socket zu arbeiten?

Nach dem Debuggen des Doctrine-Treibers habe ich eine nicht so elegante Lösung erstellt, aber sie funktioniert trotzdem und kann verbessert werden.

Ich mag es nicht, auf Umgebungsvariablen im Treiber selbst zuzugreifen, aber möglicherweise kann dies verbessert werden.

doctrine.yaml

doctrine:
    dbal:
        #driver:   %database_driver%
        driver_class: App\Infrastructure\Common\Service\PostgreSQLDoctrineDriver
        host:     %database_host%
        port:     %database_port%
        dbname:   %database_name%
        user:     %database_user%
        password: %database_password%
        #charset:  UTF8

    orm:
        auto_generate_proxy_classes: %kernel.debug%
        auto_mapping: true

PostgreSQLDoctrineDriver.php

<?php declare(strict_types=1);

namespace App\Infrastructure\Common\Service;

use Doctrine\DBAL\DBALException;
use Doctrine\DBAL\Driver\PDOConnection;
use Doctrine\DBAL\Driver\PDOPgSql\Driver;
use \PDO;
use \PDOException;
use function defined;

/**
 * Driver that connects through pdo_pgsql
 *
 * Forked original PostgreSQL driver, extended to have a possibility to pass raw PDO DSN to be
 * able to connect via Unix socket
 */
class PostgreSQLDoctrineDriver extends Driver
{
    /**
     * {@inheritdoc}
     */
    public function connect(array $params, $username = null, $password = null, array $driverOptions = [])
    {
        try {
            $pdo = new PDOConnection(
                $_SERVER['POSTGRES_DB_PDO_DSN'] ?? '',
                $username,
                $password,
                $driverOptions
            );

            if (defined('PDO::PGSQL_ATTR_DISABLE_PREPARES')
                && (! isset($driverOptions[PDO::PGSQL_ATTR_DISABLE_PREPARES])
                    || $driverOptions[PDO::PGSQL_ATTR_DISABLE_PREPARES] === true
                )
            ) {
                $pdo->setAttribute(PDO::PGSQL_ATTR_DISABLE_PREPARES, true);
            }

            /* defining client_encoding via SET NAMES to avoid inconsistent DSN support
             * - the 'client_encoding' connection param only works with postgres >= 9.1
             * - passing client_encoding via the 'options' param breaks pgbouncer support
             */
            if (isset($params['charset'])) {
                $pdo->exec('SET NAMES \'' . $params['charset'] . '\'');
            }

            return $pdo;
        } catch (PDOException $e) {
            throw DBALException::driverException($this, $e);
        }
    }

    /**
     * {@inheritdoc}
     */
    public function getName()
    {
        return 'pdo_pgsql';
    }
}