Golang微服务服务依赖管理与初始化实践

type UserService struct {
    db *sql.DB
    logger *log.Logger
}

func NewUserService(db *sql.DB, logger *log.Logger) *UserService {
    return &UserService{db: db, logger: logger}
}

func main() {
    db := initDB()
    logger := log.New(os.Stdout, "user-svc ", log.LstdFlags)
    
    userService := NewUserService(db, logger)
    // 启动HTTP服务或其他逻辑
}

cfg := loadConfig()
logger := setupLogger(cfg.LogLevel)

db, err := connectDatabase(cfg.DBURL)
if err != nil {
    logger.Fatal("failed to connect db", "error", err)
}

cache := redis.NewClient(&redis.Options{Addr: cfg.RedisAddr})

server := echo.New()
server.Use(middleware.Logger(logger))

// 注册路由和服务
registerHandlers(server, &UserService{db, logger})

logger.Info("server starting", "addr", cfg.HTTPAddr)
if err := server.Start(cfg.HTTPAddr); err != nil {
    logger.Fatal("server failed to start", "error", err)
}

type HealthChecker interface {
    Check() error
}