package transactions import ( "bytes" "context" "errors" "fmt" "math/big" "time" ethereum "github.com/ethereum/go-ethereum" "github.com/ethereum/go-ethereum/common" "github.com/ethereum/go-ethereum/common/hexutil" gethtypes "github.com/ethereum/go-ethereum/core/types" "github.com/ethereum/go-ethereum/log" "github.com/status-im/status-go/account" "github.com/status-im/status-go/eth-node/crypto" "github.com/status-im/status-go/eth-node/types" "github.com/status-im/status-go/params" "github.com/status-im/status-go/rpc" ) const ( // sendTxTimeout defines how many seconds to wait before returning result in sentTransaction(). sendTxTimeout = 300 * time.Second defaultGas = 90000 ValidSignatureSize = 65 ) // ErrInvalidSignatureSize is returned if a signature is not 65 bytes to avoid panic from go-ethereum var ErrInvalidSignatureSize = errors.New("signature size must be 65") type ErrBadNonce struct { nonce uint64 expectedNonce uint64 } func (e *ErrBadNonce) Error() string { return fmt.Sprintf("bad nonce. expected %d, got %d", e.expectedNonce, e.nonce) } // Transactor validates, signs transactions. // It uses upstream to propagate transactions to the Ethereum network. type Transactor struct { rpcWrapper *rpcWrapper sendTxTimeout time.Duration rpcCallTimeout time.Duration networkID uint64 nonce *Nonce log log.Logger } // NewTransactor returns a new Manager. func NewTransactor() *Transactor { return &Transactor{ sendTxTimeout: sendTxTimeout, nonce: NewNonce(), log: log.New("package", "status-go/transactions.Manager"), } } // SetNetworkID selects a correct network. func (t *Transactor) SetNetworkID(networkID uint64) { t.networkID = networkID } func (t *Transactor) NetworkID() uint64 { return t.networkID } // SetRPC sets RPC params, a client and a timeout func (t *Transactor) SetRPC(rpcClient *rpc.Client, timeout time.Duration) { t.rpcWrapper = newRPCWrapper(rpcClient, rpcClient.UpstreamChainID) t.rpcCallTimeout = timeout } func (t *Transactor) NextNonce(rpcClient *rpc.Client, chainID uint64, from types.Address) (uint64, UnlockNonceFunc, error) { wrapper := newRPCWrapper(rpcClient, chainID) return t.nonce.Next(wrapper, from) } func (t *Transactor) EstimateGas(network *params.Network, from common.Address, to common.Address, value *big.Int, input []byte) (uint64, error) { rpcWrapper := newRPCWrapper(t.rpcWrapper.RPCClient, network.ChainID) ctx, cancel := context.WithTimeout(context.Background(), t.rpcCallTimeout) defer cancel() msg := ethereum.CallMsg{ From: from, To: &to, Value: value, Data: input, } return rpcWrapper.EstimateGas(ctx, msg) } // SendTransaction is an implementation of eth_sendTransaction. It queues the tx to the sign queue. func (t *Transactor) SendTransaction(sendArgs SendTxArgs, verifiedAccount *account.SelectedExtKey) (hash types.Hash, err error) { hash, err = t.validateAndPropagate(t.rpcWrapper, verifiedAccount, sendArgs) return } func (t *Transactor) SendTransactionWithChainID(chainID uint64, sendArgs SendTxArgs, verifiedAccount *account.SelectedExtKey) (hash types.Hash, err error) { wrapper := newRPCWrapper(t.rpcWrapper.RPCClient, chainID) hash, err = t.validateAndPropagate(wrapper, verifiedAccount, sendArgs) return } func (t *Transactor) ValidateAndBuildTransaction(chainID uint64, sendArgs SendTxArgs) (tx *gethtypes.Transaction, unlock UnlockNonceFunc, err error) { wrapper := newRPCWrapper(t.rpcWrapper.RPCClient, chainID) tx, unlock, err = t.validateAndBuildTransaction(wrapper, sendArgs) return } func (t *Transactor) AddSignatureToTransaction(chainID uint64, tx *gethtypes.Transaction, sig []byte) (*gethtypes.Transaction, error) { if len(sig) != ValidSignatureSize { return nil, ErrInvalidSignatureSize } rpcWrapper := newRPCWrapper(t.rpcWrapper.RPCClient, chainID) chID := big.NewInt(int64(rpcWrapper.chainID)) signer := gethtypes.NewLondonSigner(chID) txWithSignature, err := tx.WithSignature(signer, sig) if err != nil { return nil, err } return txWithSignature, nil } func (t *Transactor) SendRawTransaction(chainID uint64, rawTx string) error { rpcWrapper := newRPCWrapper(t.rpcWrapper.RPCClient, chainID) ctx, cancel := context.WithTimeout(context.Background(), t.rpcCallTimeout) defer cancel() return rpcWrapper.SendRawTransaction(ctx, rawTx) } func (t *Transactor) SendTransactionWithSignature(tx *gethtypes.Transaction) (hash types.Hash, err error) { rpcWrapper := newRPCWrapper(t.rpcWrapper.RPCClient, tx.ChainId().Uint64()) ctx, cancel := context.WithTimeout(context.Background(), t.rpcCallTimeout) defer cancel() if err := rpcWrapper.SendTransaction(ctx, tx); err != nil { return hash, err } return types.Hash(tx.Hash()), nil } func (t *Transactor) AddSignatureToTransactionAndSend(chainID uint64, tx *gethtypes.Transaction, sig []byte) (hash types.Hash, err error) { txWithSignature, err := t.AddSignatureToTransaction(chainID, tx, sig) if err != nil { return hash, err } return t.SendTransactionWithSignature(txWithSignature) } // BuildTransactionAndSendWithSignature receive a transaction and a signature, serialize them together and propage it to the network. // It's different from eth_sendRawTransaction because it receives a signature and not a serialized transaction with signature. // Since the transactions is already signed, we assume it was validated and used the right nonce. func (t *Transactor) BuildTransactionAndSendWithSignature(chainID uint64, args SendTxArgs, sig []byte) (hash types.Hash, err error) { if !args.Valid() { return hash, ErrInvalidSendTxArgs } if len(sig) != ValidSignatureSize { return hash, ErrInvalidSignatureSize } tx := t.buildTransaction(args) rpcWrapper := newRPCWrapper(t.rpcWrapper.RPCClient, chainID) expectedNonce, unlock, err := t.nonce.Next(rpcWrapper, args.From) if err != nil { return hash, err } if unlock != nil { defer func() { unlock(err == nil, expectedNonce) }() } if tx.Nonce() != expectedNonce { return hash, &ErrBadNonce{tx.Nonce(), expectedNonce} } hash, err = t.AddSignatureToTransactionAndSend(chainID, tx, sig) return hash, err } func (t *Transactor) HashTransaction(args SendTxArgs) (validatedArgs SendTxArgs, hash types.Hash, err error) { if !args.Valid() { return validatedArgs, hash, ErrInvalidSendTxArgs } validatedArgs = args nonce, unlock, err := t.nonce.Next(t.rpcWrapper, args.From) if err != nil { return validatedArgs, hash, err } if unlock != nil { defer unlock(false, 0) } gasPrice := (*big.Int)(args.GasPrice) gasFeeCap := (*big.Int)(args.MaxFeePerGas) gasTipCap := (*big.Int)(args.MaxPriorityFeePerGas) if args.GasPrice == nil && args.MaxFeePerGas == nil { ctx, cancel := context.WithTimeout(context.Background(), t.rpcCallTimeout) defer cancel() gasPrice, err = t.rpcWrapper.SuggestGasPrice(ctx) if err != nil { return validatedArgs, hash, err } } chainID := big.NewInt(int64(t.networkID)) value := (*big.Int)(args.Value) var gas uint64 if args.Gas == nil { ctx, cancel := context.WithTimeout(context.Background(), t.rpcCallTimeout) defer cancel() var ( gethTo common.Address gethToPtr *common.Address ) if args.To != nil { gethTo = common.Address(*args.To) gethToPtr = &gethTo } if args.GasPrice == nil { gas, err = t.rpcWrapper.EstimateGas(ctx, ethereum.CallMsg{ From: common.Address(args.From), To: gethToPtr, GasFeeCap: gasFeeCap, GasTipCap: gasTipCap, Value: value, Data: args.GetInput(), }) } else { gas, err = t.rpcWrapper.EstimateGas(ctx, ethereum.CallMsg{ From: common.Address(args.From), To: gethToPtr, GasPrice: gasPrice, Value: value, Data: args.GetInput(), }) } if err != nil { return validatedArgs, hash, err } if gas < defaultGas { t.log.Info("default gas will be used because estimated is lower", "estimated", gas, "default", defaultGas) gas = defaultGas } } else { gas = uint64(*args.Gas) } newNonce := hexutil.Uint64(nonce) newGas := hexutil.Uint64(gas) validatedArgs.Nonce = &newNonce if args.GasPrice != nil { validatedArgs.GasPrice = (*hexutil.Big)(gasPrice) } else { validatedArgs.MaxPriorityFeePerGas = (*hexutil.Big)(gasTipCap) validatedArgs.MaxPriorityFeePerGas = (*hexutil.Big)(gasFeeCap) } validatedArgs.Gas = &newGas tx := t.buildTransaction(validatedArgs) hash = types.Hash(gethtypes.NewLondonSigner(chainID).Hash(tx)) return validatedArgs, hash, nil } // make sure that only account which created the tx can complete it func (t *Transactor) validateAccount(args SendTxArgs, selectedAccount *account.SelectedExtKey) error { if selectedAccount == nil { return account.ErrNoAccountSelected } if !bytes.Equal(args.From.Bytes(), selectedAccount.Address.Bytes()) { return ErrInvalidTxSender } return nil } func (t *Transactor) validateAndBuildTransaction(rpcWrapper *rpcWrapper, args SendTxArgs) (tx *gethtypes.Transaction, unlock UnlockNonceFunc, err error) { if !args.Valid() { return tx, nil, ErrInvalidSendTxArgs } var nonce uint64 if args.Nonce != nil { nonce = uint64(*args.Nonce) } else { nonce, unlock, err = t.nonce.Next(rpcWrapper, args.From) if err != nil { return tx, nil, err } } ctx, cancel := context.WithTimeout(context.Background(), t.rpcCallTimeout) defer cancel() gasPrice := (*big.Int)(args.GasPrice) if !args.IsDynamicFeeTx() && args.GasPrice == nil { gasPrice, err = rpcWrapper.SuggestGasPrice(ctx) if err != nil { return tx, unlock, err } } value := (*big.Int)(args.Value) var gas uint64 if args.Gas != nil { gas = uint64(*args.Gas) } else if args.Gas == nil && !args.IsDynamicFeeTx() { ctx, cancel = context.WithTimeout(context.Background(), t.rpcCallTimeout) defer cancel() var ( gethTo common.Address gethToPtr *common.Address ) if args.To != nil { gethTo = common.Address(*args.To) gethToPtr = &gethTo } gas, err = rpcWrapper.EstimateGas(ctx, ethereum.CallMsg{ From: common.Address(args.From), To: gethToPtr, GasPrice: gasPrice, Value: value, Data: args.GetInput(), }) if err != nil { return tx, unlock, err } if gas < defaultGas { t.log.Info("default gas will be used because estimated is lower", "estimated", gas, "default", defaultGas) gas = defaultGas } } tx = t.buildTransactionWithOverrides(nonce, value, gas, gasPrice, args) return tx, unlock, nil } func (t *Transactor) validateAndPropagate(rpcWrapper *rpcWrapper, selectedAccount *account.SelectedExtKey, args SendTxArgs) (hash types.Hash, err error) { if err = t.validateAccount(args, selectedAccount); err != nil { return hash, err } tx, unlock, err := t.validateAndBuildTransaction(rpcWrapper, args) defer func() { if unlock != nil { unlock(err == nil, tx.Nonce()) } }() if err != nil { return hash, err } chainID := big.NewInt(int64(rpcWrapper.chainID)) signedTx, err := gethtypes.SignTx(tx, gethtypes.NewLondonSigner(chainID), selectedAccount.AccountKey.PrivateKey) if err != nil { return hash, err } ctx, cancel := context.WithTimeout(context.Background(), t.rpcCallTimeout) defer cancel() if err := rpcWrapper.SendTransaction(ctx, signedTx); err != nil { return hash, err } return types.Hash(signedTx.Hash()), nil } func (t *Transactor) buildTransaction(args SendTxArgs) *gethtypes.Transaction { var ( nonce uint64 value *big.Int gas uint64 gasPrice *big.Int ) if args.Nonce != nil { nonce = uint64(*args.Nonce) } if args.Value != nil { value = (*big.Int)(args.Value) } if args.Gas != nil { gas = uint64(*args.Gas) } if args.GasPrice != nil { gasPrice = (*big.Int)(args.GasPrice) } return t.buildTransactionWithOverrides(nonce, value, gas, gasPrice, args) } func (t *Transactor) buildTransactionWithOverrides(nonce uint64, value *big.Int, gas uint64, gasPrice *big.Int, args SendTxArgs) *gethtypes.Transaction { var tx *gethtypes.Transaction if args.To != nil { to := common.Address(*args.To) var txData gethtypes.TxData if args.IsDynamicFeeTx() { gasTipCap := (*big.Int)(args.MaxPriorityFeePerGas) gasFeeCap := (*big.Int)(args.MaxFeePerGas) txData = &gethtypes.DynamicFeeTx{ Nonce: nonce, Gas: gas, GasTipCap: gasTipCap, GasFeeCap: gasFeeCap, To: &to, Value: value, Data: args.GetInput(), } } else { txData = &gethtypes.LegacyTx{ Nonce: nonce, GasPrice: gasPrice, Gas: gas, To: &to, Value: value, Data: args.GetInput(), } } tx = gethtypes.NewTx(txData) t.logNewTx(args, gas, gasPrice, value) } else { if args.IsDynamicFeeTx() { gasTipCap := (*big.Int)(args.MaxPriorityFeePerGas) gasFeeCap := (*big.Int)(args.MaxFeePerGas) txData := &gethtypes.DynamicFeeTx{ Nonce: nonce, Value: value, Gas: gas, GasTipCap: gasTipCap, GasFeeCap: gasFeeCap, Data: args.GetInput(), } tx = gethtypes.NewTx(txData) } else { tx = gethtypes.NewContractCreation(nonce, value, gas, gasPrice, args.GetInput()) } t.logNewContract(args, gas, gasPrice, value, nonce) } return tx } func (t *Transactor) logNewTx(args SendTxArgs, gas uint64, gasPrice *big.Int, value *big.Int) { t.log.Info("New transaction", "From", args.From, "To", *args.To, "Gas", gas, "GasPrice", gasPrice, "Value", value, ) } func (t *Transactor) logNewContract(args SendTxArgs, gas uint64, gasPrice *big.Int, value *big.Int, nonce uint64) { t.log.Info("New contract", "From", args.From, "Gas", gas, "GasPrice", gasPrice, "Value", value, "Contract address", crypto.CreateAddress(args.From, nonce), ) }