emq_auth_redis cannot use hostname as server address

[totojack]

Hi.

It seems it's not possible to use hostname into configuration auth.redis.server but it must be a couple IP:PORT. I'm trying to use emqtt inside docker compose with a redis service (with name "redis") and if I set for example

auth.redis.server = redis:6379

or

auth.redis.server = "redis":6379

I've got this error

emqtt | 08:35:15.125 [error] Error generating configuration in phase transform_datatypes
emqtt | 08:35:15.125 [error] Error transforming datatype for: auth.redis.server
emqtt | 08:35:15.125 [error] ""redis":6379" cannot be converted to a(n) integer
emqtt | 08:35:15.125 [error] ""redis":6379" cannot be converted to a(n) IP

I'm quite sure that it was possible in previous versions to use something like

{redis_pool, [
%% pool options
{pool_size, 8},
{auto_reconnect, 2},

%% redis options
{host, "redis"},
{port, 6379},
{database, 0},
{password, ""}
]}.

Thanks