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moveBalanceHandler.go
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/
moveBalanceHandler.go
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package workflows
import (
"context"
"errors"
"fmt"
"math/big"
"sync"
"github.com/multiversx/mx-chain-core-go/core/check"
"github.com/multiversx/mx-chain-core-go/data/transaction"
"github.com/multiversx/mx-chain-crypto-go/signing"
"github.com/multiversx/mx-chain-crypto-go/signing/ed25519"
"github.com/multiversx/mx-sdk-go/blockchain/cryptoProvider"
"github.com/multiversx/mx-sdk-go/data"
)
var (
suite = ed25519.NewEd25519()
keyGen = signing.NewKeyGenerator(suite)
)
// MoveBalanceHandlerArgs is the argument DTO for the NewMoveBalanceHandler constructor function
type MoveBalanceHandlerArgs struct {
Proxy ProxyHandler
TxInteractor TransactionInteractor
ReceiverAddress string
TrackableAddressesProvider TrackableAddressesProvider
MinimumBalance *big.Int
}
// moveBalanceHandler is an implementation that can create move balance transactions that will empty the balance
//of the existing accounts
type moveBalanceHandler struct {
proxy ProxyHandler
mutCachedNetworkConfigs sync.RWMutex
cachedNetConfigs *data.NetworkConfig
txInteractor TransactionInteractor
trackableAddressesProvider TrackableAddressesProvider
receiverAddress string
minimumBalance *big.Int
}
// NewMoveBalanceHandler creates a new instance of the moveBalanceHandler struct
func NewMoveBalanceHandler(args MoveBalanceHandlerArgs) (*moveBalanceHandler, error) {
if check.IfNil(args.TrackableAddressesProvider) {
return nil, ErrNilTrackableAddressesProvider
}
if check.IfNil(args.Proxy) {
return nil, ErrNilProxy
}
if check.IfNil(args.TxInteractor) {
return nil, ErrNilTransactionInteractor
}
if args.MinimumBalance == nil {
return nil, ErrNilMinimumBalance
}
mbh := &moveBalanceHandler{
proxy: args.Proxy,
txInteractor: args.TxInteractor,
trackableAddressesProvider: args.TrackableAddressesProvider,
receiverAddress: args.ReceiverAddress,
minimumBalance: args.MinimumBalance,
}
return mbh, nil
}
// CacheNetworkConfigs will try to cache the network configs
func (mbh *moveBalanceHandler) CacheNetworkConfigs(ctx context.Context) error {
cachedNetConfigs, err := mbh.proxy.GetNetworkConfig(ctx)
if err != nil {
return err
}
mbh.mutCachedNetworkConfigs.Lock()
mbh.cachedNetConfigs = cachedNetConfigs
mbh.mutCachedNetworkConfigs.Unlock()
return nil
}
// GenerateMoveBalanceTransactions wil generate and add to the transaction interactor the move
// balance transactions. Will output a log error if a transaction will be failed.
func (mbh *moveBalanceHandler) GenerateMoveBalanceTransactions(ctx context.Context, addresses []string) {
for _, address := range addresses {
mbh.generateTransactionAndHandleErrors(ctx, address)
}
}
func (mbh *moveBalanceHandler) generateTransactionAndHandleErrors(ctx context.Context, address string) {
err := mbh.generateTransaction(ctx, address)
if err != nil {
err = fmt.Errorf("%w for provided address %s", err, address)
log.Error(err.Error())
}
}
func (mbh *moveBalanceHandler) generateTransaction(ctx context.Context, address string) error {
addressHandler, err := data.NewAddressFromBech32String(address)
if err != nil {
return err
}
mbh.mutCachedNetworkConfigs.RLock()
networkConfigs := mbh.cachedNetConfigs
mbh.mutCachedNetworkConfigs.RUnlock()
if networkConfigs == nil {
return errors.New("nil cached configs")
}
tx, availableBalanceString, err := mbh.proxy.GetDefaultTransactionArguments(ctx, addressHandler, networkConfigs)
if err != nil {
return err
}
availableBalance, ok := big.NewInt(0).SetString(availableBalanceString, 10)
if !ok {
return ErrInvalidAvailableBalanceValue
}
if availableBalance.Cmp(mbh.minimumBalance) < 0 {
log.Debug("will not send move-balance transaction as it is under the set threshold",
"address", address,
"available", availableBalance.String(),
"minimum allowed", mbh.minimumBalance.String(),
)
return nil
}
//add custom data bytes here if the move-balance transaction towards the hot wallet needs
// to carry some unique information
tx.Data = nil
tx.Receiver = mbh.receiverAddress
value := availableBalance.Sub(availableBalance, mbh.computeTxFee(networkConfigs, tx))
tx.Value = value.String()
skBytes := mbh.trackableAddressesProvider.PrivateKeyOfBech32Address(address)
cryptoHolder, err := cryptoProvider.NewCryptoComponentsHolder(keyGen, skBytes)
if err != nil {
return err
}
err = mbh.txInteractor.ApplyUserSignature(cryptoHolder, &tx)
if err != nil {
return err
}
log.Debug("adding transaction", "from", address, "to", mbh.receiverAddress, "value", value.String())
mbh.txInteractor.AddTransaction(&tx)
return nil
}
func (mbh *moveBalanceHandler) computeTxFee(networkConfigs *data.NetworkConfig, tx transaction.FrontendTransaction) *big.Int {
// this implementation should change if more complex transactions should be generated
// if the transaction is required to do a smart contract call, wrap a transaction using the relay mechanism
// or do an ESDT/SFT/NFT operation, then we need to query the proxy's `/transaction/cost` endpoint route
// in order to get the correct gas limit
gasLimit := networkConfigs.MinGasLimit + uint64(len(tx.Data))*networkConfigs.GasPerDataByte
result := big.NewInt(int64(tx.GasPrice))
result.Mul(result, big.NewInt(int64(gasLimit)))
return result
}
// IsInterfaceNil returns true if there is no value under the interface
func (mbh *moveBalanceHandler) IsInterfaceNil() bool {
return mbh == nil
}