package client import ( "encoding/base64" "errors" "fmt" "github.com/nspcc-dev/neo-go/pkg/config/netmode" "github.com/nspcc-dev/neo-go/pkg/core/block" "github.com/nspcc-dev/neo-go/pkg/core/fee" "github.com/nspcc-dev/neo-go/pkg/core/native/nativenames" "github.com/nspcc-dev/neo-go/pkg/core/native/nativeprices" "github.com/nspcc-dev/neo-go/pkg/core/state" "github.com/nspcc-dev/neo-go/pkg/core/transaction" "github.com/nspcc-dev/neo-go/pkg/crypto/keys" "github.com/nspcc-dev/neo-go/pkg/encoding/address" "github.com/nspcc-dev/neo-go/pkg/encoding/fixedn" "github.com/nspcc-dev/neo-go/pkg/io" "github.com/nspcc-dev/neo-go/pkg/network/payload" "github.com/nspcc-dev/neo-go/pkg/rpc/request" "github.com/nspcc-dev/neo-go/pkg/rpc/response/result" "github.com/nspcc-dev/neo-go/pkg/smartcontract" "github.com/nspcc-dev/neo-go/pkg/smartcontract/trigger" "github.com/nspcc-dev/neo-go/pkg/util" "github.com/nspcc-dev/neo-go/pkg/vm/opcode" "github.com/nspcc-dev/neo-go/pkg/wallet" ) var errNetworkNotInitialized = errors.New("RPC client network is not initialized") // CalculateNetworkFee calculates network fee for transaction. The transaction may // have empty witnesses for contract signers and may have only verification scripts // filled for standard sig/multisig signers. func (c *Client) CalculateNetworkFee(tx *transaction.Transaction) (int64, error) { var ( params = request.NewRawParams(tx.Bytes()) resp = new(result.NetworkFee) ) if err := c.performRequest("calculatenetworkfee", params, resp); err != nil { return 0, err } return resp.Value, nil } // GetApplicationLog returns the contract log based on the specified txid. func (c *Client) GetApplicationLog(hash util.Uint256, trig *trigger.Type) (*result.ApplicationLog, error) { var ( params = request.NewRawParams(hash.StringLE()) resp = new(result.ApplicationLog) ) if trig != nil { params.Values = append(params.Values, trig.String()) } if err := c.performRequest("getapplicationlog", params, resp); err != nil { return nil, err } return resp, nil } // GetBestBlockHash returns the hash of the tallest block in the main chain. func (c *Client) GetBestBlockHash() (util.Uint256, error) { var resp = util.Uint256{} if err := c.performRequest("getbestblockhash", request.NewRawParams(), &resp); err != nil { return resp, err } return resp, nil } // GetBlockCount returns the number of blocks in the main chain. func (c *Client) GetBlockCount() (uint32, error) { var resp uint32 if err := c.performRequest("getblockcount", request.NewRawParams(), &resp); err != nil { return resp, err } return resp, nil } // GetBlockByIndex returns a block by its height. You should initialize network magic // with Init before calling GetBlockByIndex. func (c *Client) GetBlockByIndex(index uint32) (*block.Block, error) { return c.getBlock(request.NewRawParams(index)) } // GetBlockByHash returns a block by its hash. You should initialize network magic // with Init before calling GetBlockByHash. func (c *Client) GetBlockByHash(hash util.Uint256) (*block.Block, error) { return c.getBlock(request.NewRawParams(hash.StringLE())) } func (c *Client) getBlock(params request.RawParams) (*block.Block, error) { var ( resp []byte err error b *block.Block ) if !c.initDone { return nil, errNetworkNotInitialized } if err = c.performRequest("getblock", params, &resp); err != nil { return nil, err } r := io.NewBinReaderFromBuf(resp) b = block.New(c.StateRootInHeader()) b.DecodeBinary(r) if r.Err != nil { return nil, r.Err } return b, nil } // GetBlockByIndexVerbose returns a block wrapper with additional metadata by // its height. You should initialize network magic with Init before calling GetBlockByIndexVerbose. // NOTE: to get transaction.ID and transaction.Size, use t.Hash() and io.GetVarSize(t) respectively. func (c *Client) GetBlockByIndexVerbose(index uint32) (*result.Block, error) { return c.getBlockVerbose(request.NewRawParams(index, 1)) } // GetBlockByHashVerbose returns a block wrapper with additional metadata by // its hash. You should initialize network magic with Init before calling GetBlockByHashVerbose. func (c *Client) GetBlockByHashVerbose(hash util.Uint256) (*result.Block, error) { return c.getBlockVerbose(request.NewRawParams(hash.StringLE(), 1)) } func (c *Client) getBlockVerbose(params request.RawParams) (*result.Block, error) { var ( resp = &result.Block{} err error ) if !c.initDone { return nil, errNetworkNotInitialized } if err = c.performRequest("getblock", params, resp); err != nil { return nil, err } return resp, nil } // GetBlockHash returns the hash value of the corresponding block, based on the specified index. func (c *Client) GetBlockHash(index uint32) (util.Uint256, error) { var ( params = request.NewRawParams(index) resp = util.Uint256{} ) if err := c.performRequest("getblockhash", params, &resp); err != nil { return resp, err } return resp, nil } // GetBlockHeader returns the corresponding block header information from serialized hex string // according to the specified script hash. You should initialize network magic // // with Init before calling GetBlockHeader. func (c *Client) GetBlockHeader(hash util.Uint256) (*block.Header, error) { var ( params = request.NewRawParams(hash.StringLE()) resp []byte h *block.Header ) if !c.initDone { return nil, errNetworkNotInitialized } if err := c.performRequest("getblockheader", params, &resp); err != nil { return nil, err } r := io.NewBinReaderFromBuf(resp) h = new(block.Header) h.DecodeBinary(r) if r.Err != nil { return nil, r.Err } return h, nil } // GetBlockHeaderCount returns the number of headers in the main chain. func (c *Client) GetBlockHeaderCount() (uint32, error) { var resp uint32 if err := c.performRequest("getblockheadercount", request.NewRawParams(), &resp); err != nil { return resp, err } return resp, nil } // GetBlockHeaderVerbose returns the corresponding block header information from Json format string // according to the specified script hash. func (c *Client) GetBlockHeaderVerbose(hash util.Uint256) (*result.Header, error) { var ( params = request.NewRawParams(hash.StringLE(), 1) resp = &result.Header{} ) if err := c.performRequest("getblockheader", params, resp); err != nil { return nil, err } return resp, nil } // GetBlockSysFee returns the system fees of the block, based on the specified index. func (c *Client) GetBlockSysFee(index uint32) (fixedn.Fixed8, error) { var ( params = request.NewRawParams(index) resp fixedn.Fixed8 ) if err := c.performRequest("getblocksysfee", params, &resp); err != nil { return resp, err } return resp, nil } // GetConnectionCount returns the current number of connections for the node. func (c *Client) GetConnectionCount() (int, error) { var ( params = request.NewRawParams() resp int ) if err := c.performRequest("getconnectioncount", params, &resp); err != nil { return resp, err } return resp, nil } // GetCommittee returns the current public keys of NEO nodes in committee. func (c *Client) GetCommittee() (keys.PublicKeys, error) { var ( params = request.NewRawParams() resp = new(keys.PublicKeys) ) if err := c.performRequest("getcommittee", params, resp); err != nil { return nil, err } return *resp, nil } // GetContractStateByHash queries contract information, according to the contract script hash. func (c *Client) GetContractStateByHash(hash util.Uint160) (*state.Contract, error) { return c.getContractState(hash.StringLE()) } // GetContractStateByAddressOrName queries contract information, according to the contract address or name. func (c *Client) GetContractStateByAddressOrName(addressOrName string) (*state.Contract, error) { return c.getContractState(addressOrName) } // GetContractStateByID queries contract information, according to the contract ID. func (c *Client) GetContractStateByID(id int32) (*state.Contract, error) { return c.getContractState(id) } // getContractState is an internal representation of GetContractStateBy* methods. func (c *Client) getContractState(param interface{}) (*state.Contract, error) { var ( params = request.NewRawParams(param) resp = &state.Contract{} ) if err := c.performRequest("getcontractstate", params, resp); err != nil { return resp, err } return resp, nil } // GetNativeContracts queries information about native contracts. func (c *Client) GetNativeContracts() ([]state.NativeContract, error) { var ( params = request.NewRawParams() resp []state.NativeContract ) if err := c.performRequest("getnativecontracts", params, &resp); err != nil { return resp, err } return resp, nil } // GetNEP17Balances is a wrapper for getnep17balances RPC. func (c *Client) GetNEP17Balances(address util.Uint160) (*result.NEP17Balances, error) { params := request.NewRawParams(address.StringLE()) resp := new(result.NEP17Balances) if err := c.performRequest("getnep17balances", params, resp); err != nil { return nil, err } return resp, nil } // GetNEP17Transfers is a wrapper for getnep17transfers RPC. Address parameter // is mandatory, while all the others are optional. Start and stop parameters // are supported since neo-go 0.77.0 and limit and page since neo-go 0.78.0. // These parameters are positional in the JSON-RPC call, you can't specify limit // and not specify start/stop for example. func (c *Client) GetNEP17Transfers(address string, start, stop *uint32, limit, page *int) (*result.NEP17Transfers, error) { params := request.NewRawParams(address) if start != nil { params.Values = append(params.Values, *start) if stop != nil { params.Values = append(params.Values, *stop) if limit != nil { params.Values = append(params.Values, *limit) if page != nil { params.Values = append(params.Values, *page) } } else if page != nil { return nil, errors.New("bad parameters") } } else if limit != nil || page != nil { return nil, errors.New("bad parameters") } } else if stop != nil || limit != nil || page != nil { return nil, errors.New("bad parameters") } resp := new(result.NEP17Transfers) if err := c.performRequest("getnep17transfers", params, resp); err != nil { return nil, err } return resp, nil } // GetPeers returns the list of nodes that the node is currently connected/disconnected from. func (c *Client) GetPeers() (*result.GetPeers, error) { var ( params = request.NewRawParams() resp = &result.GetPeers{} ) if err := c.performRequest("getpeers", params, resp); err != nil { return resp, err } return resp, nil } // GetRawMemPool returns the list of unconfirmed transactions in memory. func (c *Client) GetRawMemPool() ([]util.Uint256, error) { var ( params = request.NewRawParams() resp = new([]util.Uint256) ) if err := c.performRequest("getrawmempool", params, resp); err != nil { return *resp, err } return *resp, nil } // GetRawTransaction returns a transaction by hash. You should initialize network magic // with Init before calling GetRawTransaction. func (c *Client) GetRawTransaction(hash util.Uint256) (*transaction.Transaction, error) { var ( params = request.NewRawParams(hash.StringLE()) resp []byte err error ) if !c.initDone { return nil, errNetworkNotInitialized } if err = c.performRequest("getrawtransaction", params, &resp); err != nil { return nil, err } tx, err := transaction.NewTransactionFromBytes(resp) if err != nil { return nil, err } return tx, nil } // GetRawTransactionVerbose returns a transaction wrapper with additional // metadata by transaction's hash. You should initialize network magic // with Init before calling GetRawTransactionVerbose. // NOTE: to get transaction.ID and transaction.Size, use t.Hash() and io.GetVarSize(t) respectively. func (c *Client) GetRawTransactionVerbose(hash util.Uint256) (*result.TransactionOutputRaw, error) { var ( params = request.NewRawParams(hash.StringLE(), 1) resp = &result.TransactionOutputRaw{} err error ) if !c.initDone { return nil, errNetworkNotInitialized } if err = c.performRequest("getrawtransaction", params, resp); err != nil { return nil, err } return resp, nil } // GetState returns historical contract storage item state by the given stateroot, // historical contract hash and historical item key. func (c *Client) GetState(stateroot util.Uint256, historicalContractHash util.Uint160, historicalKey []byte) ([]byte, error) { var ( params = request.NewRawParams(stateroot.StringLE(), historicalContractHash.StringLE(), historicalKey) resp []byte ) if err := c.performRequest("getstate", params, &resp); err != nil { return nil, err } return resp, nil } // FindStates returns historical contract storage item states by the given stateroot, // historical contract hash and historical prefix. If `start` path is specified, then items // starting from `start` path are being returned (excluding item located at the start path). // If `maxCount` specified, then maximum number of items to be returned equals to `maxCount`. func (c *Client) FindStates(stateroot util.Uint256, historicalContractHash util.Uint160, historicalPrefix []byte, start []byte, maxCount *int) (result.FindStates, error) { var ( params = request.NewRawParams(stateroot.StringLE(), historicalContractHash.StringLE(), historicalPrefix, historicalPrefix, start) resp result.FindStates ) if maxCount != nil { params.Values = append(params.Values, *maxCount) } if err := c.performRequest("findstates", params, &resp); err != nil { return resp, err } return resp, nil } // GetStateHeight returns current validated and local node state height. func (c *Client) GetStateHeight() (*result.StateHeight, error) { var ( params = request.NewRawParams() resp = new(result.StateHeight) ) if err := c.performRequest("getstateheight", params, resp); err != nil { return nil, err } return resp, nil } // GetStorageByID returns the stored value, according to the contract ID and the stored key. func (c *Client) GetStorageByID(id int32, key []byte) ([]byte, error) { return c.getStorage(request.NewRawParams(id, base64.StdEncoding.EncodeToString(key))) } // GetStorageByHash returns the stored value, according to the contract script hash and the stored key. func (c *Client) GetStorageByHash(hash util.Uint160, key []byte) ([]byte, error) { return c.getStorage(request.NewRawParams(hash.StringLE(), base64.StdEncoding.EncodeToString(key))) } func (c *Client) getStorage(params request.RawParams) ([]byte, error) { var resp []byte if err := c.performRequest("getstorage", params, &resp); err != nil { return nil, err } return resp, nil } // GetTransactionHeight returns the block index in which the transaction is found. func (c *Client) GetTransactionHeight(hash util.Uint256) (uint32, error) { var ( params = request.NewRawParams(hash.StringLE()) resp uint32 ) if err := c.performRequest("gettransactionheight", params, &resp); err != nil { return resp, err } return resp, nil } // GetUnclaimedGas returns unclaimed GAS amount for the specified address. func (c *Client) GetUnclaimedGas(address string) (result.UnclaimedGas, error) { var ( params = request.NewRawParams(address) resp result.UnclaimedGas ) if err := c.performRequest("getunclaimedgas", params, &resp); err != nil { return resp, err } return resp, nil } // GetNextBlockValidators returns the current NEO consensus nodes information and voting status. func (c *Client) GetNextBlockValidators() ([]result.Validator, error) { var ( params = request.NewRawParams() resp = new([]result.Validator) ) if err := c.performRequest("getnextblockvalidators", params, resp); err != nil { return nil, err } return *resp, nil } // GetVersion returns the version information about the queried node. func (c *Client) GetVersion() (*result.Version, error) { var ( params = request.NewRawParams() resp = &result.Version{} ) if err := c.performRequest("getversion", params, resp); err != nil { return nil, err } return resp, nil } // InvokeScript returns the result of the given script after running it true the VM. // NOTE: This is a test invoke and will not affect the blockchain. func (c *Client) InvokeScript(script []byte, signers []transaction.Signer) (*result.Invoke, error) { var p = request.NewRawParams(script) return c.invokeSomething("invokescript", p, signers) } // InvokeFunction returns the results after calling the smart contract scripthash // with the given operation and parameters. // NOTE: this is test invoke and will not affect the blockchain. func (c *Client) InvokeFunction(contract util.Uint160, operation string, params []smartcontract.Parameter, signers []transaction.Signer) (*result.Invoke, error) { var p = request.NewRawParams(contract.StringLE(), operation, params) return c.invokeSomething("invokefunction", p, signers) } // InvokeContractVerify returns the results after calling `verify` method of the smart contract // with the given parameters under verification trigger type. // NOTE: this is test invoke and will not affect the blockchain. func (c *Client) InvokeContractVerify(contract util.Uint160, params []smartcontract.Parameter, signers []transaction.Signer, witnesses ...transaction.Witness) (*result.Invoke, error) { var p = request.NewRawParams(contract.StringLE(), params) return c.invokeSomething("invokecontractverify", p, signers, witnesses...) } // invokeSomething is an inner wrapper for Invoke* functions. func (c *Client) invokeSomething(method string, p request.RawParams, signers []transaction.Signer, witnesses ...transaction.Witness) (*result.Invoke, error) { var resp = new(result.Invoke) if signers != nil { if witnesses == nil { p.Values = append(p.Values, signers) } else { if len(witnesses) != len(signers) { return nil, fmt.Errorf("number of witnesses should match number of signers, got %d vs %d", len(witnesses), len(signers)) } signersWithWitnesses := make([]request.SignerWithWitness, len(signers)) for i := range signersWithWitnesses { signersWithWitnesses[i] = request.SignerWithWitness{ Signer: signers[i], Witness: witnesses[i], } } p.Values = append(p.Values, signersWithWitnesses) } } if err := c.performRequest(method, p, resp); err != nil { return nil, err } return resp, nil } // SendRawTransaction broadcasts a transaction over the NEO network. // The given hex string needs to be signed with a keypair. // When the result of the response object is true, the TX has successfully // been broadcasted to the network. func (c *Client) SendRawTransaction(rawTX *transaction.Transaction) (util.Uint256, error) { var ( params = request.NewRawParams(rawTX.Bytes()) resp = new(result.RelayResult) ) if err := c.performRequest("sendrawtransaction", params, resp); err != nil { return util.Uint256{}, err } return resp.Hash, nil } // SubmitBlock broadcasts a raw block over the NEO network. func (c *Client) SubmitBlock(b block.Block) (util.Uint256, error) { var ( params request.RawParams resp = new(result.RelayResult) ) buf := io.NewBufBinWriter() b.EncodeBinary(buf.BinWriter) if err := buf.Err; err != nil { return util.Uint256{}, err } params = request.NewRawParams(buf.Bytes()) if err := c.performRequest("submitblock", params, resp); err != nil { return util.Uint256{}, err } return resp.Hash, nil } // SubmitRawOracleResponse submits raw oracle response to the oracle node. // Raw params are used to avoid excessive marshalling. func (c *Client) SubmitRawOracleResponse(ps request.RawParams) error { return c.performRequest("submitoracleresponse", ps, new(result.RelayResult)) } // SignAndPushInvocationTx signs and pushes given script as an invocation // transaction using given wif to sign it and given cosigners to cosign it if // possible. It spends the amount of gas specified. It returns a hash of the // invocation transaction and an error. If one of the cosigners accounts is // neither contract-based nor unlocked an error is returned. func (c *Client) SignAndPushInvocationTx(script []byte, acc *wallet.Account, sysfee int64, netfee fixedn.Fixed8, cosigners []SignerAccount) (util.Uint256, error) { tx, err := c.CreateTxFromScript(script, acc, sysfee, int64(netfee), cosigners) if err != nil { return util.Uint256{}, fmt.Errorf("failed to create tx: %w", err) } return c.SignAndPushTx(tx, acc, cosigners) } // SignAndPushTx signs given transaction using given wif and cosigners and pushes // it to the chain. It returns a hash of the transaction and an error. If one of // the cosigners accounts is neither contract-based nor unlocked an error is // returned. func (c *Client) SignAndPushTx(tx *transaction.Transaction, acc *wallet.Account, cosigners []SignerAccount) (util.Uint256, error) { var ( txHash util.Uint256 err error ) if err = acc.SignTx(c.GetNetwork(), tx); err != nil { return txHash, fmt.Errorf("failed to sign tx: %w", err) } // try to add witnesses for the rest of the signers for i, signer := range tx.Signers[1:] { var isOk bool for _, cosigner := range cosigners { if signer.Account == cosigner.Signer.Account { err = cosigner.Account.SignTx(c.GetNetwork(), tx) if err != nil { // then account is non-contract-based and locked, but let's provide more detailed error if paramNum := len(cosigner.Account.Contract.Parameters); paramNum != 0 && cosigner.Account.Contract.Deployed { return txHash, fmt.Errorf("failed to add contract-based witness for signer #%d (%s): "+ "%d parameters must be provided to construct invocation script", i, address.Uint160ToString(signer.Account), paramNum) } return txHash, fmt.Errorf("failed to add witness for signer #%d (%s): account should be unlocked to add the signature. "+ "Store partially-signed transaction and then use 'wallet sign' command to cosign it", i, address.Uint160ToString(signer.Account)) } isOk = true break } } if !isOk { return txHash, fmt.Errorf("failed to add witness for signer #%d (%s): account wasn't provided", i, address.Uint160ToString(signer.Account)) } } txHash = tx.Hash() actualHash, err := c.SendRawTransaction(tx) if err != nil { return txHash, fmt.Errorf("failed to send tx: %w", err) } if !actualHash.Equals(txHash) { return actualHash, fmt.Errorf("sent and actual tx hashes mismatch:\n\tsent: %v\n\tactual: %v", txHash.StringLE(), actualHash.StringLE()) } return txHash, nil } // getSigners returns an array of transaction signers and corresponding accounts from // given sender and cosigners. If cosigners list already contains sender, the sender // will be placed at the start of the list. func getSigners(sender *wallet.Account, cosigners []SignerAccount) ([]transaction.Signer, []*wallet.Account, error) { var ( signers []transaction.Signer accounts []*wallet.Account ) from, err := address.StringToUint160(sender.Address) if err != nil { return nil, nil, fmt.Errorf("bad sender account address: %v", err) } s := transaction.Signer{ Account: from, Scopes: transaction.None, } for _, c := range cosigners { if c.Signer.Account == from { s.Scopes = c.Signer.Scopes continue } signers = append(signers, c.Signer) accounts = append(accounts, c.Account) } signers = append([]transaction.Signer{s}, signers...) accounts = append([]*wallet.Account{sender}, accounts...) return signers, accounts, nil } // SignAndPushP2PNotaryRequest creates and pushes P2PNotary request constructed from the main // and fallback transactions using given wif to sign it. It returns the request and an error. // Fallback transaction is constructed from the given script using the amount of gas specified. // For successful fallback transaction validation at least 2*transaction.NotaryServiceFeePerKey // GAS should be deposited to Notary contract. // Main transaction should be constructed by the user. Several rules need to be met for // successful main transaction acceptance: // 1. Native Notary contract should be a signer of the main transaction. // 2. Notary signer should have None scope. // 3. Main transaction should have dummy contract witness for Notary signer. // 4. Main transaction should have NotaryAssisted attribute with NKeys specified. // 5. NotaryAssisted attribute and dummy Notary witness (as long as the other incomplete witnesses) // should be paid for. Use CalculateNotaryWitness to calculate the amount of network fee to pay // for the attribute and Notary witness. // 6. Main transaction either shouldn't have all witnesses attached (in this case none of them // can be multisignature), or it only should have a partial multisignature. // Note: client should be initialized before SignAndPushP2PNotaryRequest call. func (c *Client) SignAndPushP2PNotaryRequest(mainTx *transaction.Transaction, fallbackScript []byte, fallbackSysFee int64, fallbackNetFee int64, fallbackValidFor uint32, acc *wallet.Account) (*payload.P2PNotaryRequest, error) { var err error if !c.initDone { return nil, errNetworkNotInitialized } notaryHash, err := c.GetNativeContractHash(nativenames.Notary) if err != nil { return nil, fmt.Errorf("failed to get native Notary hash: %w", err) } from, err := address.StringToUint160(acc.Address) if err != nil { return nil, fmt.Errorf("bad account address: %v", err) } signers := []transaction.Signer{{Account: notaryHash}, {Account: from}} if fallbackSysFee < 0 { result, err := c.InvokeScript(fallbackScript, signers) if err != nil { return nil, fmt.Errorf("can't add system fee to fallback transaction: %w", err) } if result.State != "HALT" { return nil, fmt.Errorf("can't add system fee to fallback transaction: bad vm state %s due to an error: %s", result.State, result.FaultException) } fallbackSysFee = result.GasConsumed } maxNVBDelta, err := c.GetMaxNotValidBeforeDelta() if err != nil { return nil, fmt.Errorf("failed to get MaxNotValidBeforeDelta") } if int64(fallbackValidFor) > maxNVBDelta { return nil, fmt.Errorf("fallback transaction should be valid for not more than %d blocks", maxNVBDelta) } fallbackTx := transaction.New(fallbackScript, fallbackSysFee) fallbackTx.Signers = signers fallbackTx.ValidUntilBlock = mainTx.ValidUntilBlock fallbackTx.Attributes = []transaction.Attribute{ { Type: transaction.NotaryAssistedT, Value: &transaction.NotaryAssisted{NKeys: 0}, }, { Type: transaction.NotValidBeforeT, Value: &transaction.NotValidBefore{Height: fallbackTx.ValidUntilBlock - fallbackValidFor + 1}, }, { Type: transaction.ConflictsT, Value: &transaction.Conflicts{Hash: mainTx.Hash()}, }, } extraNetFee, err := c.CalculateNotaryFee(0) if err != nil { return nil, err } fallbackNetFee += extraNetFee dummyAccount := &wallet.Account{Contract: &wallet.Contract{Deployed: false}} // don't call `verify` for Notary contract witness, because it will fail err = c.AddNetworkFee(fallbackTx, fallbackNetFee, dummyAccount, acc) if err != nil { return nil, fmt.Errorf("failed to add network fee: %w", err) } fallbackTx.Scripts = []transaction.Witness{ { InvocationScript: append([]byte{byte(opcode.PUSHDATA1), 64}, make([]byte, 64)...), VerificationScript: []byte{}, }, } if err = acc.SignTx(c.GetNetwork(), fallbackTx); err != nil { return nil, fmt.Errorf("failed to sign fallback tx: %w", err) } fallbackHash := fallbackTx.Hash() req := &payload.P2PNotaryRequest{ MainTransaction: mainTx, FallbackTransaction: fallbackTx, } req.Witness = transaction.Witness{ InvocationScript: append([]byte{byte(opcode.PUSHDATA1), 64}, acc.PrivateKey().SignHashable(uint32(c.GetNetwork()), req)...), VerificationScript: acc.GetVerificationScript(), } actualHash, err := c.SubmitP2PNotaryRequest(req) if err != nil { return req, fmt.Errorf("failed to submit notary request: %w", err) } if !actualHash.Equals(fallbackHash) { return req, fmt.Errorf("sent and actual fallback tx hashes mismatch:\n\tsent: %v\n\tactual: %v", fallbackHash.StringLE(), actualHash.StringLE()) } return req, nil } // CalculateNotaryFee calculates network fee for one dummy Notary witness and NotaryAssisted attribute with NKeys specified. // The result should be added to the transaction's net fee for successful verification. func (c *Client) CalculateNotaryFee(nKeys uint8) (int64, error) { baseExecFee, err := c.GetExecFeeFactor() if err != nil { return 0, fmt.Errorf("failed to get BaseExecFeeFactor: %w", err) } feePerByte, err := c.GetFeePerByte() if err != nil { return 0, fmt.Errorf("failed to get FeePerByte: %w", err) } return int64((nKeys+1))*transaction.NotaryServiceFeePerKey + // fee for NotaryAssisted attribute fee.Opcode(baseExecFee, // Notary node witness opcode.PUSHDATA1, opcode.RET, // invocation script opcode.PUSH0, opcode.SYSCALL, opcode.RET) + // System.Contract.CallNative nativeprices.NotaryVerificationPrice*baseExecFee + // Notary witness verification price feePerByte*int64(io.GetVarSize(make([]byte, 66))) + // invocation script per-byte fee feePerByte*int64(io.GetVarSize([]byte{})), // verification script per-byte fee nil } // SubmitP2PNotaryRequest submits given P2PNotaryRequest payload to the RPC node. func (c *Client) SubmitP2PNotaryRequest(req *payload.P2PNotaryRequest) (util.Uint256, error) { var resp = new(result.RelayResult) bytes, err := req.Bytes() if err != nil { return util.Uint256{}, fmt.Errorf("failed to encode request: %w", err) } params := request.NewRawParams(bytes) if err := c.performRequest("submitnotaryrequest", params, resp); err != nil { return util.Uint256{}, err } return resp.Hash, nil } // ValidateAddress verifies that the address is a correct NEO address. func (c *Client) ValidateAddress(address string) error { var ( params = request.NewRawParams(address) resp = &result.ValidateAddress{} ) if err := c.performRequest("validateaddress", params, resp); err != nil { return err } if !resp.IsValid { return errors.New("validateaddress returned false") } return nil } // CalculateValidUntilBlock calculates ValidUntilBlock field for tx as // current blockchain height + number of validators. Number of validators // is the length of blockchain validators list got from GetNextBlockValidators() // method. Validators count is being cached and updated every 100 blocks. func (c *Client) CalculateValidUntilBlock() (uint32, error) { var ( result uint32 validatorsCount uint32 ) blockCount, err := c.GetBlockCount() if err != nil { return result, fmt.Errorf("can't get block count: %w", err) } if c.cache.calculateValidUntilBlock.expiresAt > blockCount { validatorsCount = c.cache.calculateValidUntilBlock.validatorsCount } else { validators, err := c.GetNextBlockValidators() if err != nil { return result, fmt.Errorf("can't get validators: %w", err) } validatorsCount = uint32(len(validators)) c.cache.calculateValidUntilBlock = calculateValidUntilBlockCache{ validatorsCount: validatorsCount, expiresAt: blockCount + cacheTimeout, } } return blockCount + validatorsCount + 1, nil } // AddNetworkFee adds network fee for each witness script and optional extra // network fee to transaction. `accs` is an array signer's accounts. func (c *Client) AddNetworkFee(tx *transaction.Transaction, extraFee int64, accs ...*wallet.Account) error { if len(tx.Signers) != len(accs) { return errors.New("number of signers must match number of scripts") } size := io.GetVarSize(tx) var ef int64 for i, cosigner := range tx.Signers { if accs[i].Contract.Deployed { res, err := c.InvokeContractVerify(cosigner.Account, smartcontract.Params{}, tx.Signers) if err != nil { return fmt.Errorf("failed to invoke verify: %w", err) } if res.State != "HALT" { return fmt.Errorf("invalid VM state %s due to an error: %s", res.State, res.FaultException) } if l := len(res.Stack); l != 1 { return fmt.Errorf("result stack length should be equal to 1, got %d", l) } r, err := topIntFromStack(res.Stack) if err != nil { return fmt.Errorf("signer #%d: failed to get `verify` result from stack: %w", i, err) } if r == 0 { return fmt.Errorf("signer #%d: `verify` returned `false`", i) } tx.NetworkFee += res.GasConsumed size += io.GetVarSize([]byte{}) * 2 // both scripts are empty continue } if ef == 0 { var err error ef, err = c.GetExecFeeFactor() if err != nil { return fmt.Errorf("can't get `ExecFeeFactor`: %w", err) } } netFee, sizeDelta := fee.Calculate(ef, accs[i].Contract.Script) tx.NetworkFee += netFee size += sizeDelta } fee, err := c.GetFeePerByte() if err != nil { return err } tx.NetworkFee += int64(size)*fee + extraFee return nil } // GetNetwork returns the network magic of the RPC node client connected to. func (c *Client) GetNetwork() netmode.Magic { return c.network } // StateRootInHeader returns true if state root is contained in block header. func (c *Client) StateRootInHeader() bool { return c.stateRootInHeader } // GetNativeContractHash returns native contract hash by its name. func (c *Client) GetNativeContractHash(name string) (util.Uint160, error) { hash, ok := c.cache.nativeHashes[name] if ok { return hash, nil } cs, err := c.GetContractStateByAddressOrName(name) if err != nil { return util.Uint160{}, err } c.cache.nativeHashes[name] = cs.Hash return cs.Hash, nil }