+ return cfg
+}
+
+type OS interface {
+ Getenv(key string, defValue string) string
+}
+
+type osImpl struct{}
+
+func (osImpl) Getenv(key string, defValue string) string {
+ val := os.Getenv(key)
+ if val == "" {
+ val = defValue
+ }
+ return val
+}
+
+func ReadConfigAndCreateDbClients(osI OS, clientCreator RedisClientCreator) []*DB {
+ cfg := readConfig(osI)
+ return createDbClients(cfg, clientCreator)
+}
+
+func createDbClients(cfg Config, clientCreator RedisClientCreator) []*DB {
+ if cfg.clusterAddrList == "" {
+ return []*DB{createLegacyDbClient(cfg, clientCreator)}
+ }
+
+ dbs := []*DB{}
+
+ addrList := strings.Split(cfg.clusterAddrList, ",")
+ for _, addr := range addrList {
+ db := createDbClient(cfg, addr, clientCreator)
+ dbs = append(dbs, db)
+ }
+ return dbs
+}
+
+func createLegacyDbClient(cfg Config, clientCreator RedisClientCreator) *DB {
+ return createDbClient(cfg, cfg.hostname, clientCreator)
+}
+
+func createDbClient(cfg Config, hostName string, clientCreator RedisClientCreator) *DB {
+ var client RedisClient
+ if cfg.sentinelPort == "" {
+ client = clientCreator(hostName, cfg.port, "", false)
+ } else {
+ client = clientCreator(hostName, cfg.sentinelPort, cfg.masterName, true)