问题:Symfony/Doctrine:如何使 Doctrine 与 Unix 套接字一起工作?

我正在尝试使用 Unix 套接字连接到 PostgreSQL。我认为只有一种方法可以连接到主机上的数据库,但应用程序在 Docker 中(我遵循不容器化非复制数据库的原则)。我正在使用带有最新 Doctrine 的 Symfony 4。

我用 PDO 对原始 PHP 进行了测试,它可以工作。我不知道如何强制 Doctrine 使用 unix 套接字。

<?php
$dbh = new PDO('pgsql:host=/var/run/postgresql;user=xxxx;dbname=zzzz;password=yyyy');
$dbh->setAttribute(PDO::ERRMODE_EXCEPTION, true);
var_dump($dbh->errorInfo());

$stmt = $dbh->query('SELECT 1 as dupa;');
$stmt->execute();

var_dump($stmt->fetchAll());

结果如预期:

www-data@ef0f2269b69a:~/html$ php o.php 
array(3) {
  [0]=>
  string(5) "00000"
  [1]=>
  NULL
  [2]=>
  NULL
}
array(1) {
  [0]=>
  array(2) {
    ["dupa"]=>
    int(1)
    [0]=>
    int(1)
  }
}

问题是我在 Doctrine 中配置的任何内容:

In PDOConnection.php line 27:
                                                                        
  [PDOException (7)]                                                    
  SQLSTATE[08006] [7] could not connect to server: Connection refused   
        Is the server running on host "localhost" (127.0.0.1) and accepting  
        TCP/IP connections on port 5432?                                     
  could not connect to server: Cannot assign requested address          
        Is the server running on host "localhost" (::1) and accepting        
        TCP/IP connections on port 5432?    

我试过Doctrine的语法,原始的PDO语法,不知道。我的 pdo_pgsql 是否有可能没有编译 unix 套接字支持?

这是我在 Doctrine 中尝试的数据库 URL:

pdo-pgsql://yyyy:xxxxx@/var/run/postgresql:5432/zzzzz
pgsql:host=/var/run/postgresql;user=xxxx;dbname=zzzz;password=yyyy

解答

在调试了 Doctrine 的驱动程序后,我创建了一个不太优雅的解决方案,但它仍然可以工作,并且可以改进。

我不喜欢在驱动程序本身中访问环境变量,但可能这可以改进。

教义.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';
    }
}