254 lines
11 KiB
Go
254 lines
11 KiB
Go
/*
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Package notary provides an RPC-based wrapper for the Notary subsystem.
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It provides both regular ContractReader/Contract interfaces for the notary
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contract and notary-specific Actor as well as some helper functions to simplify
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creation of notary requests.
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*/
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package notary
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import (
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"errors"
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"fmt"
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"math"
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"math/big"
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"github.com/nspcc-dev/neo-go/pkg/core/native/nativehashes"
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"github.com/nspcc-dev/neo-go/pkg/core/transaction"
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"github.com/nspcc-dev/neo-go/pkg/neorpc/result"
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"github.com/nspcc-dev/neo-go/pkg/rpcclient/unwrap"
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"github.com/nspcc-dev/neo-go/pkg/smartcontract"
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"github.com/nspcc-dev/neo-go/pkg/util"
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"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
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)
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const (
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setMaxNVBDeltaMethod = "setMaxNotValidBeforeDelta"
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setFeePKMethod = "setNotaryServiceFeePerKey"
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)
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// ContractInvoker is used by ContractReader to perform read-only calls.
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type ContractInvoker interface {
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Call(contract util.Uint160, operation string, params ...any) (*result.Invoke, error)
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}
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// ContractActor is used by Contract to create and send transactions.
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type ContractActor interface {
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ContractInvoker
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MakeCall(contract util.Uint160, method string, params ...any) (*transaction.Transaction, error)
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MakeRun(script []byte) (*transaction.Transaction, error)
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MakeUnsignedCall(contract util.Uint160, method string, attrs []transaction.Attribute, params ...any) (*transaction.Transaction, error)
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MakeUnsignedRun(script []byte, attrs []transaction.Attribute) (*transaction.Transaction, error)
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SendCall(contract util.Uint160, method string, params ...any) (util.Uint256, uint32, error)
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SendRun(script []byte) (util.Uint256, uint32, error)
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}
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// ContractReader represents safe (read-only) methods of Notary. It can be
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// used to query various data, but `verify` method is not exposed there because
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// it can't be successful in standalone invocation (missing transaction with the
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// NotaryAssisted attribute and its signature).
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type ContractReader struct {
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invoker ContractInvoker
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}
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// Contract provides full Notary interface, both safe and state-changing methods.
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// The only method omitted is onNEP17Payment which can only be called
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// successfully from the GASToken native contract.
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type Contract struct {
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ContractReader
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actor ContractActor
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}
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// OnNEP17PaymentData is the data set that is accepted by the notary contract
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// onNEP17Payment handler. It's mandatory for GAS tranfers to this contract.
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type OnNEP17PaymentData struct {
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// Account can be nil, in this case transfer sender (from) account is used.
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Account *util.Uint160
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// Till specifies the deposit lock time (in blocks).
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Till uint32
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}
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// OnNEP17PaymentData have to implement stackitem.Convertible interface to be
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// compatible with emit package.
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var _ = stackitem.Convertible(&OnNEP17PaymentData{})
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// Hash stores the hash of the native Notary contract.
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var Hash = nativehashes.Notary
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// NewReader creates an instance of ContractReader to get data from the Notary
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// contract.
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func NewReader(invoker ContractInvoker) *ContractReader {
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return &ContractReader{invoker}
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}
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// New creates an instance of Contract to perform state-changing actions in the
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// Notary contract.
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func New(actor ContractActor) *Contract {
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return &Contract{*NewReader(actor), actor}
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}
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// BalanceOf returns the locked GAS balance for the given account.
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func (c *ContractReader) BalanceOf(account util.Uint160) (*big.Int, error) {
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return unwrap.BigInt(c.invoker.Call(Hash, "balanceOf", account))
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}
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// ExpirationOf returns the index of the block when the GAS deposit for the given
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// account will expire.
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func (c *ContractReader) ExpirationOf(account util.Uint160) (uint32, error) {
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res, err := c.invoker.Call(Hash, "expirationOf", account)
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ret, err := unwrap.LimitedInt64(res, err, 0, math.MaxUint32)
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return uint32(ret), err
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}
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// GetMaxNotValidBeforeDelta returns the maximum NotValidBefore attribute delta
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// that can be used in notary-assisted transactions.
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func (c *ContractReader) GetMaxNotValidBeforeDelta() (uint32, error) {
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res, err := c.invoker.Call(Hash, "getMaxNotValidBeforeDelta")
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ret, err := unwrap.LimitedInt64(res, err, 0, math.MaxUint32)
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return uint32(ret), err
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}
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// LockDepositUntil creates and sends a transaction that extends the deposit lock
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// time for the given account. The return result from the "lockDepositUntil"
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// method is checked to be true, so transaction fails (with FAULT state) if not
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// successful. The returned values are transaction hash, its ValidUntilBlock
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// value and an error if any.
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func (c *Contract) LockDepositUntil(account util.Uint160, index uint32) (util.Uint256, uint32, error) {
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return c.actor.SendRun(lockScript(account, index))
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}
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// LockDepositUntilTransaction creates a transaction that extends the deposit lock
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// time for the given account. The return result from the "lockDepositUntil"
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// method is checked to be true, so transaction fails (with FAULT state) if not
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// successful. The returned values are transaction hash, its ValidUntilBlock
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// value and an error if any. The transaction is signed, but not sent to the
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// network, instead it's returned to the caller.
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func (c *Contract) LockDepositUntilTransaction(account util.Uint160, index uint32) (*transaction.Transaction, error) {
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return c.actor.MakeRun(lockScript(account, index))
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}
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// LockDepositUntilUnsigned creates a transaction that extends the deposit lock
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// time for the given account. The return result from the "lockDepositUntil"
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// method is checked to be true, so transaction fails (with FAULT state) if not
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// successful. The returned values are transaction hash, its ValidUntilBlock
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// value and an error if any. The transaction is not signed and just returned to
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// the caller.
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func (c *Contract) LockDepositUntilUnsigned(account util.Uint160, index uint32) (*transaction.Transaction, error) {
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return c.actor.MakeUnsignedRun(lockScript(account, index), nil)
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}
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func lockScript(account util.Uint160, index uint32) []byte {
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// We know parameters exactly (unlike with nep17.Transfer), so this can't fail.
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script, _ := smartcontract.CreateCallWithAssertScript(Hash, "lockDepositUntil", account.BytesBE(), int64(index))
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return script
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}
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// SetMaxNotValidBeforeDelta creates and sends a transaction that sets the new
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// maximum NotValidBefore attribute value delta that can be used in
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// notary-assisted transactions. The action is successful when transaction
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// ends in HALT state. Notice that this setting can be changed only by the
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// network's committee, so use an appropriate Actor. The returned values are
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// transaction hash, its ValidUntilBlock value and an error if any.
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func (c *Contract) SetMaxNotValidBeforeDelta(blocks uint32) (util.Uint256, uint32, error) {
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return c.actor.SendCall(Hash, setMaxNVBDeltaMethod, blocks)
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}
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// SetMaxNotValidBeforeDeltaTransaction creates a transaction that sets the new
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// maximum NotValidBefore attribute value delta that can be used in
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// notary-assisted transactions. The action is successful when transaction
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// ends in HALT state. Notice that this setting can be changed only by the
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// network's committee, so use an appropriate Actor. The transaction is signed,
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// but not sent to the network, instead it's returned to the caller.
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func (c *Contract) SetMaxNotValidBeforeDeltaTransaction(blocks uint32) (*transaction.Transaction, error) {
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return c.actor.MakeCall(Hash, setMaxNVBDeltaMethod, blocks)
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}
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// SetMaxNotValidBeforeDeltaUnsigned creates a transaction that sets the new
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// maximum NotValidBefore attribute value delta that can be used in
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// notary-assisted transactions. The action is successful when transaction
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// ends in HALT state. Notice that this setting can be changed only by the
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// network's committee, so use an appropriate Actor. The transaction is not
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// signed and just returned to the caller.
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func (c *Contract) SetMaxNotValidBeforeDeltaUnsigned(blocks uint32) (*transaction.Transaction, error) {
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return c.actor.MakeUnsignedCall(Hash, setMaxNVBDeltaMethod, nil, blocks)
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}
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// Withdraw creates and sends a transaction that withdraws the deposit belonging
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// to "from" account and sends it to "to" account. The return result from the
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// "withdraw" method is checked to be true, so transaction fails (with FAULT
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// state) if not successful. The returned values are transaction hash, its
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// ValidUntilBlock value and an error if any.
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func (c *Contract) Withdraw(from util.Uint160, to util.Uint160) (util.Uint256, uint32, error) {
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return c.actor.SendRun(withdrawScript(from, to))
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}
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// WithdrawTransaction creates a transaction that withdraws the deposit belonging
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// to "from" account and sends it to "to" account. The return result from the
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// "withdraw" method is checked to be true, so transaction fails (with FAULT
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// state) if not successful. The transaction is signed, but not sent to the
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// network, instead it's returned to the caller.
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func (c *Contract) WithdrawTransaction(from util.Uint160, to util.Uint160) (*transaction.Transaction, error) {
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return c.actor.MakeRun(withdrawScript(from, to))
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}
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// WithdrawUnsigned creates a transaction that withdraws the deposit belonging
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// to "from" account and sends it to "to" account. The return result from the
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// "withdraw" method is checked to be true, so transaction fails (with FAULT
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// state) if not successful. The transaction is not signed and just returned to
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// the caller.
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func (c *Contract) WithdrawUnsigned(from util.Uint160, to util.Uint160) (*transaction.Transaction, error) {
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return c.actor.MakeUnsignedRun(withdrawScript(from, to), nil)
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}
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func withdrawScript(from util.Uint160, to util.Uint160) []byte {
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// We know parameters exactly (unlike with nep17.Transfer), so this can't fail.
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script, _ := smartcontract.CreateCallWithAssertScript(Hash, "withdraw", from.BytesBE(), to.BytesBE())
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return script
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}
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// ToStackItem implements stackitem.Convertible interface.
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func (d *OnNEP17PaymentData) ToStackItem() (stackitem.Item, error) {
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return stackitem.NewArray([]stackitem.Item{
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stackitem.Make(d.Account),
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stackitem.Make(d.Till),
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}), nil
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}
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// FromStackItem implements stackitem.Convertible interface.
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func (d *OnNEP17PaymentData) FromStackItem(si stackitem.Item) error {
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arr, ok := si.Value().([]stackitem.Item)
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if !ok {
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return fmt.Errorf("unexpected stackitem type: %s", si.Type())
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}
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if len(arr) != 2 {
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return fmt.Errorf("unexpected number of fields: %d vs %d", len(arr), 2)
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}
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if arr[0] != stackitem.Item(stackitem.Null{}) {
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accBytes, err := arr[0].TryBytes()
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if err != nil {
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return fmt.Errorf("failed to retrieve account bytes: %w", err)
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}
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acc, err := util.Uint160DecodeBytesBE(accBytes)
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if err != nil {
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return fmt.Errorf("failed to decode account bytes: %w", err)
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}
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d.Account = &acc
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}
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till, err := arr[1].TryInteger()
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if err != nil {
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return fmt.Errorf("failed to retrieve till: %w", err)
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}
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if !till.IsInt64() {
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return errors.New("till is not an int64")
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}
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val := till.Int64()
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if val > math.MaxUint32 {
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return fmt.Errorf("till is larger than max uint32 value: %d", val)
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}
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d.Till = uint32(val)
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return nil
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}
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