새로운 사용자 초기화

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func InitializeUser(ctx context.Context, logger Logger, db *sql.DB, nk NakamaModule, out *api.Session, in *api.AuthenticateDeviceRequest) error {
  if out.Created {
    // Only run this logic if the account that has authenticated is new.
    userID, ok := ctx.Value(runtime.RUNTIME_CTX_USER_ID).(string)
    if !ok {
      return "", errors.New("Invalid context")
    }
    changeset := map[string]interface{}{
      "coins": 10,    // Add 10 coins to the user's wallet.
      "gems":  5,     // Add 5 gems from the user's wallet.
      "artifacts": 0, // No artifacts to start with.
    }
    var metadata map[string]interface{}
    if err := nk.WalletUpdate(ctx, userID, changeset, metadata, true); err != nil {
      // Handle error.
    }
  }
}

// Register as after hook, this call should be in InitModule.
if err := initializer.RegisterAfterAuthenticateDevice(InitializeUser); err != nil {
  logger.Error("Unable to register: %v", err)
  return err
}