forked from TrueCloudLab/neoneo-go
6be9367f03
Update documentation as well to mention it and not mention outdated APIs. We can't link them yet, this will be done after the release.
236 lines
11 KiB
Go
236 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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"math"
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"math/big"
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"github.com/nspcc-dev/neo-go/pkg/core/native/nativenames"
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"github.com/nspcc-dev/neo-go/pkg/core/state"
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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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)
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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 ...interface{}) (*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 ...interface{}) (*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 ...interface{}) (*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 ...interface{}) (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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// Hash stores the hash of the native Notary contract.
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var Hash = state.CreateNativeContractHash(nativenames.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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// GetNotaryServiceFeePerKey returns the per-key fee amount paid by transactions
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// for the NotaryAssisted attribute.
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func (c *ContractReader) GetNotaryServiceFeePerKey() (int64, error) {
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return unwrap.Int64(c.invoker.Call(Hash, "getNotaryServiceFeePerKey"))
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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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// SetNotaryServiceFeePerKey creates and sends a transaction that sets the new
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// per-key fee value paid for using the notary service. The action is successful
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// when transaction ends in HALT state. Notice that this setting can be changed
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// only by the network's committee, so use an appropriate Actor. The returned
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// values are transaction hash, its ValidUntilBlock value and an error if any.
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func (c *Contract) SetNotaryServiceFeePerKey(fee int64) (util.Uint256, uint32, error) {
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return c.actor.SendCall(Hash, setFeePKMethod, fee)
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}
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// SetNotaryServiceFeePerKeyTransaction creates a transaction that sets the new
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// per-key fee value paid for using the notary service. The action is successful
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// when transaction ends in HALT state. Notice that this setting can be changed
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// only by the network's committee, so use an appropriate Actor. The transaction
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// is signed, but not sent to the network, instead it's returned to the caller.
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func (c *Contract) SetNotaryServiceFeePerKeyTransaction(fee int64) (*transaction.Transaction, error) {
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return c.actor.MakeCall(Hash, setFeePKMethod, fee)
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}
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// SetNotaryServiceFeePerKeyUnsigned creates a transaction that sets the new
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// per-key fee value paid for using the notary service. The action is successful
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// when transaction ends in HALT state. Notice that this setting can be changed
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// only by the network's committee, so use an appropriate Actor. The transaction
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// is not signed and just returned to the caller.
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func (c *Contract) SetNotaryServiceFeePerKeyUnsigned(fee int64) (*transaction.Transaction, error) {
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return c.actor.MakeUnsignedCall(Hash, setFeePKMethod, nil, fee)
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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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