Autowire specific DBAL connection when using multiple of them

I'm using Doctrine 2 where I have multiple connections for DBAL. I have also multiple EntityManagers in ORM.

I need to be able to somehow autowire specific DBAL connection into other Symfony 3 services.

I can autowire any EntitiyManager using EntityManagerDecorator but don't know how to do the same with connection. I'm able to get the connection from EntityManager but I don't think it's the way to go.

You can specify wrapper class for doctrine connections, no proxy class needed:

#config.yml
doctrine:
    dbal:
        connections:
            default:
                wrapper_class: AppBundle\Connections\ConnectionDefault
                ...
            second:
                wrapper_class: AppBundle\Connections\ConnectionSecond
                ...

Connections should extend Doctrine\DBAL\Connection:

<?php

namespace AppBundle\Connection;

use Doctrine\DBAL\Connection;

class ConnectionDefault extends Connection
{

}

class ConnectionSecond extends Connection
{

}

and create service aliases:

#services.yml
services:
    ...
    AppBundle\Connections\ConnectionDefault: '@doctrine.dbal.default_connection'
    AppBundle\Connections\ConnectionSecond: '@doctrine.dbal.second_connection'

then you can simply inject desired connection into service by typehinting it:

class MyService {
    public function __construct(ConnectionDefault $connection) {...}
}

class MyOtherService {
    public function __construct(ConnectionSecond $connection) {...}
}