frostfs-node/pkg/morph/client/notary.go

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package client
import (
"crypto/elliptic"
"encoding/binary"
"errors"
"fmt"
"math"
"math/big"
"strings"
"time"
"git.frostfs.info/TrueCloudLab/frostfs-node/internal/logs"
"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util/rand"
"github.com/nspcc-dev/neo-go/pkg/core/native/nativenames"
"github.com/nspcc-dev/neo-go/pkg/core/native/noderoles"
"github.com/nspcc-dev/neo-go/pkg/core/transaction"
"github.com/nspcc-dev/neo-go/pkg/crypto/hash"
"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
"github.com/nspcc-dev/neo-go/pkg/encoding/fixedn"
"github.com/nspcc-dev/neo-go/pkg/neorpc"
"github.com/nspcc-dev/neo-go/pkg/neorpc/result"
"github.com/nspcc-dev/neo-go/pkg/rpcclient/actor"
"github.com/nspcc-dev/neo-go/pkg/rpcclient/notary"
sc "github.com/nspcc-dev/neo-go/pkg/smartcontract"
"github.com/nspcc-dev/neo-go/pkg/util"
"github.com/nspcc-dev/neo-go/pkg/vm"
"github.com/nspcc-dev/neo-go/pkg/vm/vmstate"
"github.com/nspcc-dev/neo-go/pkg/wallet"
"go.uber.org/zap"
)
type (
notaryInfo struct {
txValidTime uint32 // minimum amount of blocks when mainTx will be valid
roundTime uint32 // extra amount of blocks to synchronize sidechain height diff of inner ring nodes
alphabetSource AlphabetKeys // source of alphabet node keys to prepare witness
notary util.Uint160
proxy util.Uint160
}
notaryCfg struct {
proxy util.Uint160
txValidTime, roundTime uint32
alphabetSource AlphabetKeys
}
AlphabetKeys func() (keys.PublicKeys, error)
NotaryOption func(*notaryCfg)
)
const (
defaultNotaryValidTime = 50
defaultNotaryRoundTime = 100
notaryBalanceOfMethod = "balanceOf"
notaryExpirationOfMethod = "expirationOf"
setDesignateMethod = "designateAsRole"
notaryBalanceErrMsg = "can't fetch notary balance"
notaryNotEnabledPanicMsg = "notary support was not enabled on this client"
)
var errUnexpectedItems = errors.New("invalid number of NEO VM arguments on stack")
func defaultNotaryConfig(c *Client) *notaryCfg {
return &notaryCfg{
txValidTime: defaultNotaryValidTime,
roundTime: defaultNotaryRoundTime,
alphabetSource: c.Committee,
}
}
// EnableNotarySupport creates notary structure in client that provides
// ability for client to get alphabet keys from committee or provided source
// and use proxy contract script hash to create tx for notary contract.
func (c *Client) EnableNotarySupport(opts ...NotaryOption) error {
c.switchLock.RLock()
defer c.switchLock.RUnlock()
if c.inactive {
return ErrConnectionLost
}
cfg := defaultNotaryConfig(c)
for _, opt := range opts {
opt(cfg)
}
if cfg.proxy.Equals(util.Uint160{}) {
var err error
cfg.proxy, err = c.NNSContractAddress(NNSProxyContractName)
if err != nil {
return fmt.Errorf("get proxy contract addess from NNS: %w", err)
}
}
notaryCfg := &notaryInfo{
proxy: cfg.proxy,
txValidTime: cfg.txValidTime,
roundTime: cfg.roundTime,
alphabetSource: cfg.alphabetSource,
notary: notary.Hash,
}
c.notary = notaryCfg
return nil
}
// IsNotaryEnabled returns true if EnableNotarySupport has been successfully
// called before.
func (c *Client) IsNotaryEnabled() bool {
return c.notary != nil
}
// ProbeNotary checks if native `Notary` contract is presented on chain.
func (c *Client) ProbeNotary() (res bool) {
c.switchLock.RLock()
defer c.switchLock.RUnlock()
if c.inactive {
return false
}
_, err := c.client.GetContractStateByAddressOrName(nativenames.Notary)
return err == nil
}
// DepositNotary calls notary deposit method. Deposit is required to operate
// with notary contract. It used by notary contract in to produce fallback tx
// if main tx failed to create. Deposit isn't last forever, so it should
// be called periodically. Notary support should be enabled in client to
// use this function.
//
// This function must be invoked with notary enabled otherwise it throws panic.
func (c *Client) DepositNotary(amount fixedn.Fixed8, delta uint32) (res util.Uint256, err error) {
c.switchLock.RLock()
defer c.switchLock.RUnlock()
if c.inactive {
return util.Uint256{}, ErrConnectionLost
}
if c.notary == nil {
panic(notaryNotEnabledPanicMsg)
}
bc, err := c.rpcActor.GetBlockCount()
if err != nil {
return util.Uint256{}, fmt.Errorf("can't get blockchain height: %w", err)
}
currentTill, err := c.depositExpirationOf()
if err != nil {
return util.Uint256{}, fmt.Errorf("can't get previous expiration value: %w", err)
}
till := int64(bc + delta)
if till < currentTill {
till = currentTill
}
return c.depositNotary(amount, till)
}
// DepositEndlessNotary calls notary deposit method. Unlike `DepositNotary`,
// this method sets notary deposit till parameter to a maximum possible value.
// This allows to avoid ValidAfterDeposit failures.
//
// This function must be invoked with notary enabled otherwise it throws panic.
func (c *Client) DepositEndlessNotary(amount fixedn.Fixed8) (res util.Uint256, err error) {
c.switchLock.RLock()
defer c.switchLock.RUnlock()
if c.inactive {
return util.Uint256{}, ErrConnectionLost
}
if c.notary == nil {
panic(notaryNotEnabledPanicMsg)
}
// till value refers to a block height and it is uint32 value in neo-go
return c.depositNotary(amount, math.MaxUint32)
}
func (c *Client) depositNotary(amount fixedn.Fixed8, till int64) (res util.Uint256, err error) {
txHash, vub, err := c.gasToken.Transfer(
c.accAddr,
c.notary.notary,
big.NewInt(int64(amount)),
[]any{c.acc.PrivateKey().GetScriptHash(), till})
if err != nil {
if !errors.Is(err, neorpc.ErrAlreadyExists) {
return util.Uint256{}, fmt.Errorf("can't make notary deposit: %w", err)
}
// Transaction is already in mempool waiting to be processed.
// This is an expected situation if we restart the service.
c.logger.Info(logs.ClientNotaryDepositHasAlreadyBeenMade,
zap.Int64("amount", int64(amount)),
zap.Int64("expire_at", till),
zap.Uint32("vub", vub),
zap.Error(err))
return util.Uint256{}, nil
}
c.logger.Info(logs.ClientNotaryDepositInvoke,
zap.Int64("amount", int64(amount)),
zap.Int64("expire_at", till),
zap.Uint32("vub", vub),
zap.Stringer("tx_hash", txHash.Reverse()))
return txHash, nil
}
// GetNotaryDeposit returns deposit of client's account in notary contract.
// Notary support should be enabled in client to use this function.
//
// This function must be invoked with notary enabled otherwise it throws panic.
func (c *Client) GetNotaryDeposit() (res int64, err error) {
c.switchLock.RLock()
defer c.switchLock.RUnlock()
if c.inactive {
return 0, ErrConnectionLost
}
if c.notary == nil {
panic(notaryNotEnabledPanicMsg)
}
sh := c.acc.PrivateKey().PublicKey().GetScriptHash()
items, err := c.TestInvoke(c.notary.notary, notaryBalanceOfMethod, sh)
if err != nil {
return 0, fmt.Errorf("%v: %w", notaryBalanceErrMsg, err)
}
if len(items) != 1 {
return 0, wrapFrostFSError(fmt.Errorf("%v: %w", notaryBalanceErrMsg, errUnexpectedItems))
}
bigIntDeposit, err := items[0].TryInteger()
if err != nil {
return 0, wrapFrostFSError(fmt.Errorf("%v: %w", notaryBalanceErrMsg, err))
}
return bigIntDeposit.Int64(), nil
}
// UpdateNotaryListPrm groups parameters of UpdateNotaryList operation.
type UpdateNotaryListPrm struct {
list keys.PublicKeys
hash util.Uint256
}
// SetList sets a list of the new notary role keys.
func (u *UpdateNotaryListPrm) SetList(list keys.PublicKeys) {
u.list = list
}
// SetHash sets hash of the transaction that led to the update
// of the notary role in the designate contract.
func (u *UpdateNotaryListPrm) SetHash(hash util.Uint256) {
u.hash = hash
}
// UpdateNotaryList updates list of notary nodes in designate contract. Requires
// committee multi signature.
//
// This function must be invoked with notary enabled otherwise it throws panic.
func (c *Client) UpdateNotaryList(prm UpdateNotaryListPrm) error {
c.switchLock.RLock()
defer c.switchLock.RUnlock()
if c.inactive {
return ErrConnectionLost
}
if c.notary == nil {
panic(notaryNotEnabledPanicMsg)
}
nonce, vub, err := c.CalculateNonceAndVUB(prm.hash)
if err != nil {
return fmt.Errorf("could not calculate nonce and `valicUntilBlock` values: %w", err)
}
return c.notaryInvokeAsCommittee(
setDesignateMethod,
nonce,
vub,
noderoles.P2PNotary,
prm.list,
)
}
// UpdateAlphabetListPrm groups parameters of UpdateNeoFSAlphabetList operation.
type UpdateAlphabetListPrm struct {
list keys.PublicKeys
hash util.Uint256
}
// SetList sets a list of the new alphabet role keys.
func (u *UpdateAlphabetListPrm) SetList(list keys.PublicKeys) {
u.list = list
}
// SetHash sets hash of the transaction that led to the update
// of the alphabet role in the designate contract.
func (u *UpdateAlphabetListPrm) SetHash(hash util.Uint256) {
u.hash = hash
}
// UpdateNeoFSAlphabetList updates list of alphabet nodes in designate contract.
// As for sidechain list should contain all inner ring nodes.
// Requires committee multi signature.
//
// This function must be invoked with notary enabled otherwise it throws panic.
func (c *Client) UpdateNeoFSAlphabetList(prm UpdateAlphabetListPrm) error {
c.switchLock.RLock()
defer c.switchLock.RUnlock()
if c.inactive {
return ErrConnectionLost
}
if c.notary == nil {
panic(notaryNotEnabledPanicMsg)
}
nonce, vub, err := c.CalculateNonceAndVUB(prm.hash)
if err != nil {
return fmt.Errorf("could not calculate nonce and `valicUntilBlock` values: %w", err)
}
return c.notaryInvokeAsCommittee(
setDesignateMethod,
nonce,
vub,
noderoles.NeoFSAlphabet,
prm.list,
)
}
// NotaryInvoke invokes contract method by sending tx to notary contract in
// blockchain. Fallback tx is a `RET`. If Notary support is not enabled
// it fallbacks to a simple `Invoke()`.
//
// `nonce` and `vub` are used only if notary is enabled.
func (c *Client) NotaryInvoke(contract util.Uint160, fee fixedn.Fixed8, nonce uint32, vub *uint32, method string, args ...any) error {
c.switchLock.RLock()
defer c.switchLock.RUnlock()
if c.inactive {
return ErrConnectionLost
}
if c.notary == nil {
return c.Invoke(contract, fee, method, args...)
}
return c.notaryInvoke(false, true, contract, nonce, vub, method, args...)
}
// NotaryInvokeNotAlpha does the same as NotaryInvoke but does not use client's
// private key in Invocation script. It means that main TX of notary request is
// not expected to be signed by the current node.
//
// Considered to be used by non-IR nodes.
func (c *Client) NotaryInvokeNotAlpha(contract util.Uint160, fee fixedn.Fixed8, method string, args ...any) error {
c.switchLock.RLock()
defer c.switchLock.RUnlock()
if c.inactive {
return ErrConnectionLost
}
if c.notary == nil {
return c.Invoke(contract, fee, method, args...)
}
return c.notaryInvoke(false, false, contract, rand.Uint32(), nil, method, args...)
}
// NotarySignAndInvokeTX signs and sends notary request that was received from
// Notary service.
// NOTE: does not fallback to simple `Invoke()`. Expected to be used only for
// TXs retrieved from the received notary requests.
func (c *Client) NotarySignAndInvokeTX(mainTx *transaction.Transaction) error {
c.switchLock.RLock()
defer c.switchLock.RUnlock()
if c.inactive {
return ErrConnectionLost
}
alphabetList, err := c.notary.alphabetSource()
if err != nil {
return fmt.Errorf("could not fetch current alphabet keys: %w", err)
}
cosigners, err := c.notaryCosignersFromTx(mainTx, alphabetList)
if err != nil {
return err
}
nAct, err := notary.NewActor(c.client, cosigners, c.acc)
if err != nil {
return err
}
// Sign exactly the same transaction we've got from the received Notary request.
err = nAct.Sign(mainTx)
if err != nil {
return fmt.Errorf("faield to sign notary request: %w", err)
}
mainH, fbH, untilActual, err := nAct.Notarize(mainTx, nil)
if err != nil && !alreadyOnChainError(err) {
return err
}
c.logger.Debug(logs.ClientNotaryRequestWithPreparedMainTXInvoked,
zap.String("tx_hash", mainH.StringLE()),
zap.Uint32("valid_until_block", untilActual),
zap.String("fallback_hash", fbH.StringLE()))
return nil
}
func (c *Client) notaryInvokeAsCommittee(method string, nonce, vub uint32, args ...any) error {
designate := c.GetDesignateHash()
return c.notaryInvoke(true, true, designate, nonce, &vub, method, args...)
}
func (c *Client) notaryInvoke(committee, invokedByAlpha bool, contract util.Uint160, nonce uint32, vub *uint32, method string, args ...any) error {
start := time.Now()
success := false
defer func() {
c.metrics.ObserveInvoke("notaryInvoke", contract.String(), method, success, time.Since(start))
}()
alphabetList, err := c.notary.alphabetSource()
if err != nil {
return err
}
until, err := c.getUntilValue(vub)
if err != nil {
return err
}
cosigners, err := c.notaryCosigners(invokedByAlpha, alphabetList, committee)
if err != nil {
return err
}
nAct, err := notary.NewActor(c.client, cosigners, c.acc)
if err != nil {
return err
}
mainH, fbH, untilActual, err := nAct.Notarize(nAct.MakeTunedCall(contract, method, nil, func(r *result.Invoke, t *transaction.Transaction) error {
if r.State != vmstate.Halt.String() {
return wrapFrostFSError(&notHaltStateError{state: r.State, exception: r.FaultException})
}
t.ValidUntilBlock = until
t.Nonce = nonce
return nil
}, args...))
if err != nil && !alreadyOnChainError(err) {
return err
}
c.logger.Debug(logs.ClientNotaryRequestInvoked,
zap.String("method", method),
zap.Uint32("valid_until_block", untilActual),
zap.String("tx_hash", mainH.StringLE()),
zap.String("fallback_hash", fbH.StringLE()))
success = true
return nil
}
func (c *Client) notaryCosignersFromTx(mainTx *transaction.Transaction, alphabetList keys.PublicKeys) ([]actor.SignerAccount, error) {
multiaddrAccount, err := c.notaryMultisigAccount(alphabetList, false, true)
if err != nil {
return nil, err
}
// Here we need to add a committee signature (second witness) to the pre-validated
// main transaction without creating a new one. However, Notary actor demands the
// proper set of signers for constructor, thus, fill it from the main transaction's signers list.
s := make([]actor.SignerAccount, 2, 3)
s[0] = actor.SignerAccount{
// Proxy contract that will pay for the execution.
Signer: mainTx.Signers[0],
Account: notary.FakeContractAccount(mainTx.Signers[0].Account),
}
s[1] = actor.SignerAccount{
// Inner ring multisignature.
Signer: mainTx.Signers[1],
Account: multiaddrAccount,
}
if len(mainTx.Signers) > 3 {
// Invoker signature (simple signature account of storage node is expected).
var acc *wallet.Account
script := mainTx.Scripts[2].VerificationScript
if len(script) == 0 {
acc = notary.FakeContractAccount(mainTx.Signers[2].Account)
} else {
pubBytes, ok := vm.ParseSignatureContract(script)
if ok {
pub, err := keys.NewPublicKeyFromBytes(pubBytes, elliptic.P256())
if err != nil {
return nil, fmt.Errorf("failed to parse verification script of signer #2: invalid public key: %w", err)
}
acc = notary.FakeSimpleAccount(pub)
} else {
m, pubsBytes, ok := vm.ParseMultiSigContract(script)
if !ok {
return nil, errors.New("failed to parse verification script of signer #2: unknown witness type")
}
pubs := make(keys.PublicKeys, len(pubsBytes))
for i := range pubs {
pubs[i], err = keys.NewPublicKeyFromBytes(pubsBytes[i], elliptic.P256())
if err != nil {
return nil, fmt.Errorf("failed to parse verification script of signer #2: invalid public key #%d: %w", i, err)
}
}
acc, err = notary.FakeMultisigAccount(m, pubs)
if err != nil {
return nil, fmt.Errorf("failed to create fake account for signer #2: %w", err)
}
}
}
s = append(s, actor.SignerAccount{
Signer: mainTx.Signers[2],
Account: acc,
})
}
return s, nil
}
func (c *Client) notaryCosigners(invokedByAlpha bool, ir []*keys.PublicKey, committee bool) ([]actor.SignerAccount, error) {
multiaddrAccount, err := c.notaryMultisigAccount(ir, committee, invokedByAlpha)
if err != nil {
return nil, err
}
s := make([]actor.SignerAccount, 2, 3)
// Proxy contract that will pay for the execution.
s[0] = actor.SignerAccount{
Signer: transaction.Signer{
Account: c.notary.proxy,
Scopes: transaction.None,
},
Account: notary.FakeContractAccount(c.notary.proxy),
}
// Inner ring multisignature.
s[1] = actor.SignerAccount{
Signer: transaction.Signer{
Account: multiaddrAccount.ScriptHash(),
Scopes: c.cfg.signer.Scopes,
AllowedContracts: c.cfg.signer.AllowedContracts,
AllowedGroups: c.cfg.signer.AllowedGroups,
},
Account: multiaddrAccount,
}
if !invokedByAlpha {
// Invoker signature.
s = append(s, actor.SignerAccount{
Signer: transaction.Signer{
Account: hash.Hash160(c.acc.GetVerificationScript()),
Scopes: c.cfg.signer.Scopes,
AllowedContracts: c.cfg.signer.AllowedContracts,
AllowedGroups: c.cfg.signer.AllowedGroups,
},
Account: c.acc,
})
}
// The last one is Notary contract that will be added to the signers list
// by Notary actor automatically.
return s, nil
}
func (c *Client) getUntilValue(vub *uint32) (uint32, error) {
if vub != nil {
return *vub, nil
}
return c.notaryTxValidationLimit()
}
func (c *Client) notaryMultisigAccount(ir []*keys.PublicKey, committee, invokedByAlpha bool) (*wallet.Account, error) {
m := sigCount(ir, committee)
var multisigAccount *wallet.Account
var err error
if invokedByAlpha {
multisigAccount = wallet.NewAccountFromPrivateKey(c.acc.PrivateKey())
err := multisigAccount.ConvertMultisig(m, ir)
if err != nil {
// wrap error as FrostFS-specific since the call is not related to any client
return nil, wrapFrostFSError(fmt.Errorf("can't convert account to inner ring multisig wallet: %w", err))
}
} else {
// alphabet multisig redeem script is
// used as verification script for
// inner ring multiaddress witness
multisigAccount, err = notary.FakeMultisigAccount(m, ir)
if err != nil {
// wrap error as FrostFS-specific since the call is not related to any client
return nil, wrapFrostFSError(fmt.Errorf("can't make inner ring multisig wallet: %w", err))
}
}
return multisigAccount, nil
}
func (c *Client) notaryTxValidationLimit() (uint32, error) {
bc, err := c.rpcActor.GetBlockCount()
if err != nil {
return 0, fmt.Errorf("can't get current blockchain height: %w", err)
}
min := bc + c.notary.txValidTime
rounded := (min/c.notary.roundTime + 1) * c.notary.roundTime
return rounded, nil
}
func (c *Client) depositExpirationOf() (int64, error) {
expirationRes, err := c.TestInvoke(c.notary.notary, notaryExpirationOfMethod, c.acc.PrivateKey().GetScriptHash())
if err != nil {
return 0, fmt.Errorf("can't invoke method: %w", err)
}
if len(expirationRes) != 1 {
return 0, fmt.Errorf("method returned unexpected item count: %d", len(expirationRes))
}
currentTillBig, err := expirationRes[0].TryInteger()
if err != nil {
return 0, fmt.Errorf("can't parse deposit till value: %w", err)
}
return currentTillBig.Int64(), nil
}
// sigCount returns the number of required signature.
// For FrostFS Alphabet M is a 2/3+1 of it (like in dBFT).
// If committee is true, returns M as N/2+1.
func sigCount(ir []*keys.PublicKey, committee bool) int {
if committee {
return sc.GetMajorityHonestNodeCount(len(ir))
}
return sc.GetDefaultHonestNodeCount(len(ir))
}
// WithTxValidTime returns a notary support option for client
// that specifies minimum amount of blocks when mainTx will be valid.
func WithTxValidTime(t uint32) NotaryOption {
return func(c *notaryCfg) {
c.txValidTime = t
}
}
// WithRoundTime returns a notary support option for client
// that specifies extra blocks to synchronize side chain
// height diff of inner ring nodes.
func WithRoundTime(t uint32) NotaryOption {
return func(c *notaryCfg) {
c.roundTime = t
}
}
// WithAlphabetSource returns a notary support option for client
// that specifies function to return list of alphabet node keys.
// By default notary subsystem uses committee as a source. This is
// valid for side chain but notary in main chain should override it.
func WithAlphabetSource(t AlphabetKeys) NotaryOption {
return func(c *notaryCfg) {
c.alphabetSource = t
}
}
// WithProxyContract sets proxy contract hash.
func WithProxyContract(h util.Uint160) NotaryOption {
return func(c *notaryCfg) {
c.proxy = h
}
}
// Neo RPC node can return `core.ErrInvalidAttribute` error with
// `conflicting transaction <> is already on chain` message. This
// error is expected and ignored. As soon as main tx persisted on
// chain everything is fine. This happens because notary contract
// requires 5 out of 7 signatures to send main tx, thus last two
// notary requests may be processed after main tx appeared on chain.
func alreadyOnChainError(err error) bool {
const alreadyOnChainErrorMessage = "already on chain"
return strings.Contains(err.Error(), alreadyOnChainErrorMessage)
}
// CalculateNotaryDepositAmount calculates notary deposit amount
// using the rule:
//
// IF notaryBalance < gasBalance * gasMul {
// DEPOSIT gasBalance / gasDiv
// } ELSE {
// DEPOSIT 1
// }
//
// gasMul and gasDiv must be positive.
func CalculateNotaryDepositAmount(c *Client, gasMul, gasDiv int64) (fixedn.Fixed8, error) {
notaryBalance, err := c.GetNotaryDeposit()
if err != nil {
return 0, fmt.Errorf("could not get notary balance: %w", err)
}
gasBalance, err := c.GasBalance()
if err != nil {
return 0, fmt.Errorf("could not get GAS balance: %w", err)
}
if gasBalance == 0 {
return 0, errors.New("zero gas balance, nothing to deposit")
}
var depositAmount int64
if gasBalance*gasMul > notaryBalance {
depositAmount = gasBalance / gasDiv
} else {
depositAmount = 1
}
return fixedn.Fixed8(depositAmount), nil
}
// CalculateNonceAndVUB calculates nonce and ValidUntilBlock values
// based on transaction hash.
func (c *Client) CalculateNonceAndVUB(hash util.Uint256) (nonce uint32, vub uint32, err error) {
return c.calculateNonceAndVUB(hash, false)
}
// CalculateNonceAndVUBControl calculates nonce and rounded ValidUntilBlock values
// based on transaction hash for use in control transactions.
func (c *Client) CalculateNonceAndVUBControl(hash util.Uint256) (nonce uint32, vub uint32, err error) {
return c.calculateNonceAndVUB(hash, true)
}
func (c *Client) calculateNonceAndVUB(hash util.Uint256, roundBlockHeight bool) (nonce uint32, vub uint32, err error) {
c.switchLock.RLock()
defer c.switchLock.RUnlock()
if c.inactive {
return 0, 0, ErrConnectionLost
}
if c.notary == nil {
return 0, 0, nil
}
nonce = binary.LittleEndian.Uint32(hash.BytesLE())
height, err := c.getTransactionHeight(hash)
if err != nil {
return 0, 0, fmt.Errorf("could not get transaction height: %w", err)
}
// For control transactions, we round down the block height to control the
// probability of all nodes producing the same transaction, since it depends
// on this value.
if roundBlockHeight {
inc := c.rpcActor.GetVersion().Protocol.MaxValidUntilBlockIncrement
height = height / inc * inc
}
return nonce, height + c.notary.txValidTime, nil
}
func (c *Client) getTransactionHeight(h util.Uint256) (uint32, error) {
success := false
startedAt := time.Now()
defer func() {
c.cache.metrics.AddMethodDuration("TxHeight", success, time.Since(startedAt))
}()
if rh, ok := c.cache.txHeights.Get(h); ok {
success = true
return rh, nil
}
height, err := c.client.GetTransactionHeight(h)
if err != nil {
return 0, err
}
c.cache.txHeights.Add(h, height)
success = true
return height, nil
}