以下是redis client单例，使用sync.Once保证无论单线程(协程)还是多线程(协程) 只执行一次。
示例
package mainimport ("context""fmt""sync""github.com/redis/go-redis/v9"
)var (RedisClientSingleton *redis.Clientonce sync.Once
)func getRedisClientSingleton() *redis.Client {once.Do(func() {rdb := redis.NewClient(&redis.Options{Addr: "",Password: "", // no password setDB: 0, // use default DB})RedisClientSingleton = rdb})return RedisClientSingleton
}func main() {rdb := getRedisClientSingleton()var ctx = context.Background()val, err := rdb.Get(ctx, "key1").Result()if err == redis.Nil {fmt.Println("key1 does not exist")} else if err != nil {panic(err)} else {fmt.Println("key1", val)}rdb2 := getRedisClientSingleton()if rdb == rdb2 {fmt.Println("rdb and rdb2 are the same")}}
)
)
