package neofs import ( "github.com/nspcc-dev/neo-go/pkg/util" neofsEvent "github.com/nspcc-dev/neofs-node/pkg/morph/event/neofs" "go.uber.org/zap" ) const ( // lockAccountLifeTime defines amount of epochs when lock account is valid. lockAccountLifetime uint64 = 20 ) // Process deposit event by invoking balance contract and sending native // gas in morph chain. func (np *Processor) processDeposit(deposit *neofsEvent.Deposit) { if !np.alphabetState.IsAlphabet() { np.log.Info("non alphabet mode, ignore deposit") return } // send transferX to balance contract err := np.balanceClient.Mint( deposit.To(), np.converter.ToBalancePrecision(deposit.Amount()), deposit.ID()) if err != nil { np.log.Error("can't transfer assets to balance contract", zap.Error(err)) } curEpoch := np.epochState.EpochCounter() receiver := deposit.To() // check if receiver already received some mint GAS emissions // we should lock there even though LRU cache is already thread save // we lock there because GAS transfer AND cache update must be atomic np.mintEmitLock.Lock() defer np.mintEmitLock.Unlock() val, ok := np.mintEmitCache.Get(receiver.String()) if ok && val.(uint64)+np.mintEmitThreshold >= curEpoch { np.log.Warn("double mint emission declined", zap.String("receiver", receiver.String()), zap.Uint64("last_emission", val.(uint64)), zap.Uint64("current_epoch", curEpoch)) return } // get gas balance of the node // before gas transfer check if the balance is greater than threshold balance, err := np.morphClient.GasBalance() if err != nil { np.log.Error("can't get gas balance of the node", zap.Error(err)) return } if balance < np.gasBalanceThreshold { np.log.Warn("gas balance threshold has been reached", zap.Int64("balance", balance), zap.Int64("threshold", np.gasBalanceThreshold)) return } err = np.morphClient.TransferGas(receiver, np.mintEmitValue) if err != nil { np.log.Error("can't transfer native gas to receiver", zap.String("error", err.Error())) return } np.mintEmitCache.Add(receiver.String(), curEpoch) } // Process withdraw event by locking assets in balance account. func (np *Processor) processWithdraw(withdraw *neofsEvent.Withdraw) { if !np.alphabetState.IsAlphabet() { np.log.Info("non alphabet mode, ignore withdraw") return } // create lock account // fixme: check collision there, consider reversed script hash lock, err := util.Uint160DecodeBytesBE(withdraw.ID()[:util.Uint160Size]) if err != nil { np.log.Error("can't create lock account", zap.Error(err)) return } curEpoch := np.epochState.EpochCounter() err = np.balanceClient.Lock( withdraw.ID(), withdraw.User(), lock, np.converter.ToBalancePrecision(withdraw.Amount()), int64(curEpoch+lockAccountLifetime)) if err != nil { np.log.Error("can't lock assets for withdraw", zap.Error(err)) } } // Process cheque event by transferring assets from lock account back to // reserve account. func (np *Processor) processCheque(cheque *neofsEvent.Cheque) { if !np.alphabetState.IsAlphabet() { np.log.Info("non alphabet mode, ignore cheque") return } err := np.balanceClient.Burn( cheque.LockAccount(), np.converter.ToBalancePrecision(cheque.Amount()), cheque.ID()) if err != nil { np.log.Error("can't transfer assets to fed contract", zap.Error(err)) } }