Use go-redis UniversalOptions/Client for simpler config

This implicitly adds support for redis sentinel HA configuration

auth_server/authn/tokendb_redis.go

@@ -30,7 +30,7 @@ import (
 )
 
 type RedisStoreConfig struct {
-	ClientOptions  *redis.Options        `yaml:"redis_options,omitempty"`
+	ClientOptions  *redis.UniversalOptions `yaml:"redis_options,omitempty"`
 	ClusterOptions *redis.ClusterOptions `yaml:"redis_cluster_options,omitempty"`
 	TokenHashCost  int                   `yaml:"token_hash_cost,omitempty"`
 }
@@ -51,7 +51,7 @@ func NewRedisTokenDB(options *RedisStoreConfig) (TokenDB, error) {
 		}
 		client = redis.NewClusterClient(options.ClusterOptions)
 	} else {
-		client = redis.NewClient(options.ClientOptions)
+		client = redis.NewUniversalClient(options.ClientOptions)
 	}
 	tokenHashCost := options.TokenHashCost
 	if tokenHashCost <= 0 {

examples/reference.yml

@@ -144,11 +144,13 @@ github_auth:
   # or Redis,
   redis_token_db:
     redis_options:
-        # with a single instance,
-        addr: localhost:6379
-    redis_cluster_options:
-        # or in the cluster mode.
-        addrs: ["localhost:7000"]
+      # with a single instance,
+      addr: localhost:6379
+      # or in the cluster mode.
+      addrs: ["localhost:7000"]
+      # or in the failover mode with redis sentinel.
+      mastername: redis-ha
+      sentineladdrs: ["redis-sentinel:26379"]
   # How long to wait when talking to GitHub servers. Optional.
   http_timeout: "10s"
   # How long to wait before revalidating the GitHub token. Optional.
@@ -221,9 +223,11 @@ gitlab_auth:
     redis_options:
       # with a single instance,
       addr: localhost:6379
-    redis_cluster_options:
       # or in the cluster mode.
       addrs: ["localhost:7000"]
+      # or in the failover mode with redis sentinel.
+      mastername: redis-ha
+      sentineladdrs: ["redis-sentinel:26379"]
   # How long to wait when talking to GitLab servers. Optional.
   http_timeout: "10s"
   # How long to wait before revalidating the Gitlab token. Optional.