Add: Check redis connection on setup

1. Add: Check redis connection on setup

cachemdl/cache.go

@@ -13,7 +13,7 @@ const (
 )
 
 var (
-	// ErrInvalidCacheType indicates provided cache type is not supportd
+	// ErrInvalidCacheType indicates provided cache type is not supported
 	ErrInvalidCacheType = errors.New("invalid cache type provided")
 )
 
@@ -44,7 +44,7 @@ func GetCacheInstance(cfg *CacheConfig) Cacher {
 		return cfg.FastCache
 
 	case TypeRedisCache:
-		cfg.RedisCache.Setup(cfg.RedisCache.Addr, cfg.RedisCache.Password, "", cfg.RedisCache.DB, cfg.RedisCache.Expiration)
+		cfg.RedisCache.Setup(cfg.RedisCache.Addr, cfg.RedisCache.Password, cfg.RedisCache.Prefix, cfg.RedisCache.DB, cfg.RedisCache.Expiration)
 		return cfg.RedisCache
 
 	default:

cachemdl/cache_redis.go

@@ -42,6 +42,7 @@ type RedisCache struct {
 	opt       *redis.Options //
 	keyStr    string         // "<Prefix>:"
 	addPrefix bool           //
+	connected bool           // will be enabled if redis client connects to server
 
 	Addr       string        // redis server address, default "127.0.0.1:6379"
 	DB         int           // redis DB on provided server, default 0
@@ -69,6 +70,13 @@ func (rc *RedisCache) Setup(addr, password, prefix string, db int, exp time.Dura
 
 	rc.opt = &opt
 	rc.cli = redis.NewClient(&opt)
+
+	if _, err := rc.cli.Ping().Result(); err != nil {
+		loggermdl.LogError("connection to redis server failed: ", err)
+	} else {
+		rc.connected = true
+	}
+
 	if prefix != "" {
 		rc.keyStr = contcat(rc.Prefix, keySplitter)
 		rc.addPrefix = true