Support Redis ACL and/or URL

[davidzhao]

Currently we have a password field, but no username. Redis 6.0+ introduced username/password pairs, that we should support.

[Redmega]

redis-go does have a method of parsing full redis url schemas

opt, err := redis.ParseURL("rediss://<user>:<pass>@localhost:6379/<db>")
if err != nil {
    panic(err)
}

rdb := redis.NewClient(opt)

I'm not too familiar with Go but my first impression was to use REDIS_HOST for both HOST or URL:

opt := redis.ParseURL(config.Redis.Address)
//pseudocode
if(config.Redis.Password != "") {
  opt.Password = config.Redis.Password
}
// /pseudocode

rc := redis.NewClient(opt)

But that might be confusing. Might be better to accept REDIS_URL that gets parsed (as you mentioned in Slack), and then have a fallback to REDIS_HOST, REDIS_USERNAME, and REDIS_PASSWORD (and REDIS_DB? Not sure how this is used as I believe my org simply uses the default)

[davidzhao]

Added Redis ACL support in 54584d6 (v0.7.5). Will handle DB selection in the future.

[davidzhao]

this capability has been added.