Fix redis_sentinel configuration reading

This fix solves two issues:
* The log messages were incorrectly using `redis-sentinel` instead of `redis_sentinel` when dumping the configuration in the logs, which was misleading.
* The configuration entries were not provided default values, preventing Viper from reading the associated environment variables

config/backends.go

@@ -188,11 +188,11 @@ type RedisSentinel struct {
 }
 
 func (cfg *RedisSentinel) validateAndLog() error {
-	log.Infof("config.backend.redis-sentinel.sentinel_addrs: %s", cfg.SentinelAddrs)
-	log.Infof("config.backend.redis-sentinel.master_name: %s", cfg.MasterName)
-	log.Infof("config.backend.redis-sentinel.db: %d", cfg.Db)
-	log.Infof("config.backend.redis-sentinel.tls.enabled: %t", cfg.TLS.Enabled)
-	log.Infof("config.backend.redis-sentinel.tls.insecure_skip_verify: %t", cfg.TLS.InsecureSkipVerify)
+	log.Infof("config.backend.redis_sentinel.sentinel_addrs: %s", cfg.SentinelAddrs)
+	log.Infof("config.backend.redis_sentinel.master_name: %s", cfg.MasterName)
+	log.Infof("config.backend.redis_sentinel.db: %d", cfg.Db)
+	log.Infof("config.backend.redis_sentinel.tls.enabled: %t", cfg.TLS.Enabled)
+	log.Infof("config.backend.redis_sentinel.tls.insecure_skip_verify: %t", cfg.TLS.InsecureSkipVerify)
 	return nil
 }
 

config/config.go

@@ -69,6 +69,16 @@ func setConfigDefaults(v *viper.Viper) {
 	v.SetDefault("backend.redis.expiration", utils.REDIS_DEFAULT_EXPIRATION_MINUTES)
 	v.SetDefault("backend.redis.tls.enabled", false)
 	v.SetDefault("backend.redis.tls.insecure_skip_verify", false)
+	v.SetDefault("backend.redis.tls.enabled", false)
+	v.SetDefault("backend.redis.tls.insecure_skip_verify", false)
+	v.SetDefault("backend.redis_sentinel.db", 0)
+	v.SetDefault("backend.redis_sentinel.master_name", "")
+	v.SetDefault("backend.redis_sentinel.password", "")
+	v.SetDefault("backend.redis_sentinel.sentinel_addrs", []string{})
+	v.SetDefault("backend.redis_sentinel.tls.enabled", false)
+	v.SetDefault("backend.redis_sentinel.tls.enabled", false)
+	v.SetDefault("backend.redis_sentinel.tls.insecure_skip_verify", false)
+	v.SetDefault("backend.redis_sentinel.tls.insecure_skip_verify", false)
 	v.SetDefault("backend.ignite.scheme", "")
 	v.SetDefault("backend.ignite.host", "")
 	v.SetDefault("backend.ignite.port", 0)