Passing a list to DSN config via env variable is not handled properly

[Vorta]

I was trying to configure SNC Redis Bundle to utilize ENV variables for the list of DSNs, but I've discovered that this case is not properly handled (or it is not intended to be possible?). I have noticed that Snc\RedisBundle\Factory\PhpredisClientFactory does have this case handled properly (line 48). The version I'm using is 3.3.0.

Steps to reproduce:

So, lets say we have the following config:

snc_redis:
    clients:
        default:
            type: phpredis
            alias: default
            dsn:
                - redis://localhost:7000
                - redis://localhost:7001
                - redis://localhost:7002
            options:
                cluster: true

This will work flawlessly. However, if I want to have the same list of DSNs passed in via environment variables, the config would look like:

snc_redis:
    clients:
        default:
            type: phpredis
            alias: default
            dsn: '%env(csv:REDIS_DSN)%'
            options:
                cluster: true

and .env would contain:

REDIS_DSN=redis://localhost:7000,redis://localhost:7001,redis://localhost:7002

In the first case Snc\RedisBundle\Factory\PredisParametersFactory receives $dsn as:

string(22) "redis://localhost:7000"

In the second case it receives:

array(3) {
  [0]=>
  string(22) "redis://localhost:7000"
  [1]=>
  string(22) "redis://localhost:7001"
  [2]=>
  string(22) "redis://localhost:7002"
}

...even though it should be the same.

[ostrolucky]

Duplicate of #483