463 lines
19 KiB
Go
463 lines
19 KiB
Go
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/*
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Package neo provides an RPC-based wrapper for the NEOToken contract.
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Safe methods are encapsulated into ContractReader structure while Contract provides
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various methods to perform state-changing calls.
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*/
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package neo
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import (
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"crypto/elliptic"
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"fmt"
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"math/big"
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"github.com/google/uuid"
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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/crypto/keys"
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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/nep17"
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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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setGasMethod = "setGasPerBlock"
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setRegMethod = "setRegisterPrice"
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)
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// Invoker is used by ContractReader to perform read-only calls.
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type Invoker interface {
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nep17.Invoker
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CallAndExpandIterator(contract util.Uint160, method string, maxItems int, params ...interface{}) (*result.Invoke, error)
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TerminateSession(sessionID uuid.UUID) error
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TraverseIterator(sessionID uuid.UUID, iterator *result.Iterator, num int) ([]stackitem.Item, error)
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}
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// Actor is used by Contract to create and send transactions.
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type Actor interface {
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nep17.Actor
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Invoker
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Run(script []byte) (*result.Invoke, error)
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MakeCall(contract util.Uint160, method string, params ...interface{}) (*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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MakeUnsignedUncheckedRun(script []byte, sysFee int64, 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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Sign(tx *transaction.Transaction) error
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SignAndSend(tx *transaction.Transaction) (util.Uint256, uint32, error)
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}
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// ContractReader represents safe (read-only) methods of NEO. It can be
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// used to query various data.
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type ContractReader struct {
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nep17.TokenReader
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invoker Invoker
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}
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// Contract provides full NEO interface, both safe and state-changing methods.
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type Contract struct {
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ContractReader
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nep17.Token
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actor Actor
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}
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// CandidateStateEvent represents a CandidateStateChanged NEO event.
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type CandidateStateEvent struct {
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Key *keys.PublicKey
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Registered bool
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Votes *big.Int
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}
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// VoteEvent represents a Vote NEO event.
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type VoteEvent struct {
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Account util.Uint160
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From *keys.PublicKey
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To *keys.PublicKey
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Amount *big.Int
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}
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// ValidatorIterator is used for iterating over GetAllCandidates results.
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type ValidatorIterator struct {
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client Invoker
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session uuid.UUID
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iterator result.Iterator
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}
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// Hash stores the hash of the native NEOToken contract.
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var Hash = state.CreateNativeContractHash(nativenames.Neo)
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// NewReader creates an instance of ContractReader to get data from the NEO
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// contract.
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func NewReader(invoker Invoker) *ContractReader {
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return &ContractReader{*nep17.NewReader(invoker, Hash), 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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// NEO contract.
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func New(actor Actor) *Contract {
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return &Contract{*NewReader(actor), *nep17.New(actor, Hash), actor}
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}
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// GetAccountState returns current NEO balance state for the account which
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// includes balance and voting data. It can return nil balance with no error
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// if the account given has no NEO.
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func (c *ContractReader) GetAccountState(account util.Uint160) (*state.NEOBalance, error) {
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itm, err := unwrap.Item(c.invoker.Call(Hash, "getAccountState", account))
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if err != nil {
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return nil, err
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}
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if _, ok := itm.(stackitem.Null); ok {
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return nil, nil
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}
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res := new(state.NEOBalance)
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err = res.FromStackItem(itm)
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if err != nil {
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return nil, err
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}
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return res, nil
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}
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// GetAllCandidates returns an iterator that allows to retrieve all registered
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// validators from it. It depends on the server to provide proper session-based
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// iterator, but can also work with expanded one.
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func (c *ContractReader) GetAllCandidates() (*ValidatorIterator, error) {
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sess, iter, err := unwrap.SessionIterator(c.invoker.Call(Hash, "getAllCandidates"))
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if err != nil {
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return nil, err
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}
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return &ValidatorIterator{
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client: c.invoker,
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iterator: iter,
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session: sess,
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}, nil
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}
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// GetAllCandidatesExpanded is similar to GetAllCandidates (uses the same NEO
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// method), but can be useful if the server used doesn't support sessions and
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// doesn't expand iterators. It creates a script that will get num of result
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// items from the iterator right in the VM and return them to you. It's only
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// limited by VM stack and GAS available for RPC invocations.
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func (c *ContractReader) GetAllCandidatesExpanded(num int) ([]result.Validator, error) {
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arr, err := unwrap.Array(c.invoker.CallAndExpandIterator(Hash, "getAllCandidates", num))
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if err != nil {
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return nil, err
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}
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return itemsToValidators(arr)
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}
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// Next returns the next set of elements from the iterator (up to num of them).
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// It can return less than num elements in case iterator doesn't have that many
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// or zero elements if the iterator has no more elements or the session is
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// expired.
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func (v *ValidatorIterator) Next(num int) ([]result.Validator, error) {
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items, err := v.client.TraverseIterator(v.session, &v.iterator, num)
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if err != nil {
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return nil, err
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}
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return itemsToValidators(items)
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}
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// Terminate closes the iterator session used by ValidatorIterator (if it's
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// session-based).
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func (v *ValidatorIterator) Terminate() error {
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if v.iterator.ID == nil {
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return nil
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}
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return v.client.TerminateSession(v.session)
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}
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// GetCandidates returns the list of validators with their vote count. This
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// method is mostly useful for historic invocations because the RPC protocol
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// provides direct getcandidates call that returns more data and works faster.
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// The contract only returns up to 256 candidates in response to this method, so
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// if there are more of them on the network you will get a truncated result, use
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// GetAllCandidates to solve this problem.
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func (c *ContractReader) GetCandidates() ([]result.Validator, error) {
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arr, err := unwrap.Array(c.invoker.Call(Hash, "getCandidates"))
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if err != nil {
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return nil, err
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}
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return itemsToValidators(arr)
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}
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func itemsToValidators(arr []stackitem.Item) ([]result.Validator, error) {
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res := make([]result.Validator, len(arr))
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for i, itm := range arr {
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str, ok := itm.Value().([]stackitem.Item)
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if !ok {
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return nil, fmt.Errorf("item #%d is not a structure", i)
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}
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if len(str) != 2 {
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return nil, fmt.Errorf("item #%d has wrong length", i)
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}
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b, err := str[0].TryBytes()
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if err != nil {
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return nil, fmt.Errorf("item #%d has wrong key: %w", i, err)
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}
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k, err := keys.NewPublicKeyFromBytes(b, elliptic.P256())
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if err != nil {
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return nil, fmt.Errorf("item #%d has wrong key: %w", i, err)
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}
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votes, err := str[1].TryInteger()
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if err != nil {
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return nil, fmt.Errorf("item #%d has wrong votes: %w", i, err)
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}
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if !votes.IsInt64() {
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return nil, fmt.Errorf("item #%d has too big number of votes", i)
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}
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res[i].PublicKey = *k
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res[i].Votes = votes.Int64()
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}
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return res, nil
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}
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// GetCommittee returns the list of committee member public keys. This
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// method is mostly useful for historic invocations because the RPC protocol
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// provides direct getcommittee call that works faster.
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func (c *ContractReader) GetCommittee() (keys.PublicKeys, error) {
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return unwrap.ArrayOfPublicKeys(c.invoker.Call(Hash, "getCommittee"))
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}
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// GetNextBlockValidators returns the list of validator keys that will sign the
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// next block. This method is mostly useful for historic invocations because the
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// RPC protocol provides direct getnextblockvalidators call that provides more
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// data and works faster.
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func (c *ContractReader) GetNextBlockValidators() (keys.PublicKeys, error) {
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return unwrap.ArrayOfPublicKeys(c.invoker.Call(Hash, "getNextBlockValidators"))
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}
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// GetGasPerBlock returns the amount of GAS generated in each block.
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func (c *ContractReader) GetGasPerBlock() (int64, error) {
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return unwrap.Int64(c.invoker.Call(Hash, "getGasPerBlock"))
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}
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// GetRegisterPrice returns the price of candidate key registration.
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func (c *ContractReader) GetRegisterPrice() (int64, error) {
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return unwrap.Int64(c.invoker.Call(Hash, "getRegisterPrice"))
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}
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// UnclaimedGas allows to calculate the amount of GAS that will be generated if
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// any NEO state change ("claim") is to happen for the given account at the given
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// block number. This method is mostly useful for historic invocations because
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// the RPC protocol provides direct getunclaimedgas method that works faster.
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func (c *ContractReader) UnclaimedGas(account util.Uint160, end uint32) (*big.Int, error) {
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return unwrap.BigInt(c.invoker.Call(Hash, "unclaimedGas", account, end))
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}
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// RegisterCandidate creates and sends a transaction that adds the given key to
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// the list of candidates that can be voted for. The return result from the
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// "registerCandidate" method is checked to be true, so transaction fails (with
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// FAULT state) if not successful. Notice that for this call to work it must be
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// witnessed by the simple account derived from the given key, so use an
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// appropriate Actor. The returned values are transaction hash, its
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// ValidUntilBlock value and an error if any.
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//
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// Notice that unlike for all other methods the script for this one is not
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// test-executed in its final form because most networks have registration price
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// set to be much higher than typical RPC server allows to spend during
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// test-execution. This adds some risk that it might fail on-chain, but in
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// practice it's not likely to happen if signers are set up correctly.
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func (c *Contract) RegisterCandidate(k *keys.PublicKey) (util.Uint256, uint32, error) {
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tx, err := c.RegisterCandidateUnsigned(k)
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if err != nil {
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return util.Uint256{}, 0, err
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}
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return c.actor.SignAndSend(tx)
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}
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// RegisterCandidateTransaction creates a transaction that adds the given key to
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// the list of candidates that can be voted for. The return result from the
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// "registerCandidate" method is checked to be true, so transaction fails (with
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// FAULT state) if not successful. Notice that for this call to work it must be
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// witnessed by the simple account derived from the given key, so use an
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// appropriate Actor. The transaction is signed, but not sent to the network,
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// instead it's returned to the caller.
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//
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// Notice that unlike for all other methods the script for this one is not
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// test-executed in its final form because most networks have registration price
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// set to be much higher than typical RPC server allows to spend during
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// test-execution. This adds some risk that it might fail on-chain, but in
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// practice it's not likely to happen if signers are set up correctly.
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func (c *Contract) RegisterCandidateTransaction(k *keys.PublicKey) (*transaction.Transaction, error) {
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tx, err := c.RegisterCandidateUnsigned(k)
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if err != nil {
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return nil, err
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}
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err = c.actor.Sign(tx)
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if err != nil {
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return nil, err
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}
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return tx, nil
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}
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// RegisterCandidateUnsigned creates a transaction that adds the given key to
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// the list of candidates that can be voted for. The return result from the
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// "registerCandidate" method is checked to be true, so transaction fails (with
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// FAULT state) if not successful. Notice that for this call to work it must be
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// witnessed by the simple account derived from the given key, so use an
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// appropriate Actor. The transaction is not signed and just returned to the
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// caller.
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//
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// Notice that unlike for all other methods the script for this one is not
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// test-executed in its final form because most networks have registration price
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// set to be much higher than typical RPC server allows to spend during
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// test-execution. This adds some risk that it might fail on-chain, but in
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// practice it's not likely to happen if signers are set up correctly.
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func (c *Contract) RegisterCandidateUnsigned(k *keys.PublicKey) (*transaction.Transaction, error) {
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// It's an unregister script intentionally.
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r, err := c.actor.Run(regScript(true, k))
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if err != nil {
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return nil, err
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}
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regPrice, err := c.GetRegisterPrice()
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if err != nil {
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return nil, err
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}
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return c.actor.MakeUnsignedUncheckedRun(regScript(false, k), r.GasConsumed+regPrice, nil)
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}
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// UnregisterCandidate creates and sends a transaction that removes the key from
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// the list of candidates that can be voted for. The return result from the
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// "unregisterCandidate" method is checked to be true, so transaction fails (with
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// FAULT state) if not successful. Notice that for this call to work it must be
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// witnessed by the simple account derived from the given key, so use an
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// appropriate Actor. 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) UnregisterCandidate(k *keys.PublicKey) (util.Uint256, uint32, error) {
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return c.actor.SendRun(regScript(true, k))
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}
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// UnregisterCandidateTransaction creates a transaction that removes the key from
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// the list of candidates that can be voted for. The return result from the
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// "unregisterCandidate" method is checked to be true, so transaction fails (with
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// FAULT state) if not successful. Notice that for this call to work it must be
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// witnessed by the simple account derived from the given key, so use an
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// appropriate Actor. The transaction is signed, but not sent to the network,
|
||
|
|
// instead it's returned to the caller.
|
||
|
|
func (c *Contract) UnregisterCandidateTransaction(k *keys.PublicKey) (*transaction.Transaction, error) {
|
||
|
|
return c.actor.MakeRun(regScript(true, k))
|
||
|
|
}
|
||
|
|
|
||
|
|
// UnregisterCandidateUnsigned creates a transaction that removes the key from
|
||
|
|
// the list of candidates that can be voted for. The return result from the
|
||
|
|
// "unregisterCandidate" method is checked to be true, so transaction fails (with
|
||
|
|
// FAULT state) if not successful. Notice that for this call to work it must be
|
||
|
|
// witnessed by the simple account derived from the given key, so use an
|
||
|
|
// appropriate Actor. The transaction is not signed and just returned to the
|
||
|
|
// caller.
|
||
|
|
func (c *Contract) UnregisterCandidateUnsigned(k *keys.PublicKey) (*transaction.Transaction, error) {
|
||
|
|
return c.actor.MakeUnsignedRun(regScript(true, k), nil)
|
||
|
|
}
|
||
|
|
|
||
|
|
func regScript(unreg bool, k *keys.PublicKey) []byte {
|
||
|
|
var method = "registerCandidate"
|
||
|
|
|
||
|
|
if unreg {
|
||
|
|
method = "unregisterCandidate"
|
||
|
|
}
|
||
|
|
|
||
|
|
// We know parameters exactly (unlike with nep17.Transfer), so this can't fail.
|
||
|
|
script, _ := smartcontract.CreateCallWithAssertScript(Hash, method, k.Bytes())
|
||
|
|
return script
|
||
|
|
}
|
||
|
|
|
||
|
|
// Vote creates and sends a transaction that casts a vote from the given account
|
||
|
|
// to the given key which can be nil (in which case any previous vote is removed).
|
||
|
|
// The return result from the "vote" method is checked to be true, so transaction
|
||
|
|
// fails (with FAULT state) if voting is not successful. The returned values are
|
||
|
|
// transaction hash, its ValidUntilBlock value and an error if any.
|
||
|
|
func (c *Contract) Vote(account util.Uint160, voteTo *keys.PublicKey) (util.Uint256, uint32, error) {
|
||
|
|
return c.actor.SendRun(voteScript(account, voteTo))
|
||
|
|
}
|
||
|
|
|
||
|
|
// VoteTransaction creates a transaction that casts a vote from the given account
|
||
|
|
// to the given key which can be nil (in which case any previous vote is removed).
|
||
|
|
// The return result from the "vote" method is checked to be true, so transaction
|
||
|
|
// fails (with FAULT state) if voting is not successful. The transaction is signed,
|
||
|
|
// but not sent to the network, instead it's returned to the caller.
|
||
|
|
func (c *Contract) VoteTransaction(account util.Uint160, voteTo *keys.PublicKey) (*transaction.Transaction, error) {
|
||
|
|
return c.actor.MakeRun(voteScript(account, voteTo))
|
||
|
|
}
|
||
|
|
|
||
|
|
// VoteUnsigned creates a transaction that casts a vote from the given account
|
||
|
|
// to the given key which can be nil (in which case any previous vote is removed).
|
||
|
|
// The return result from the "vote" method is checked to be true, so transaction
|
||
|
|
// fails (with FAULT state) if voting is not successful. The transaction is not
|
||
|
|
// signed and just returned to the caller.
|
||
|
|
func (c *Contract) VoteUnsigned(account util.Uint160, voteTo *keys.PublicKey) (*transaction.Transaction, error) {
|
||
|
|
return c.actor.MakeUnsignedRun(voteScript(account, voteTo), nil)
|
||
|
|
}
|
||
|
|
|
||
|
|
func voteScript(account util.Uint160, voteTo *keys.PublicKey) []byte {
|
||
|
|
var param interface{}
|
||
|
|
|
||
|
|
if voteTo != nil {
|
||
|
|
param = voteTo.Bytes()
|
||
|
|
}
|
||
|
|
// We know parameters exactly (unlike with nep17.Transfer), so this can't fail.
|
||
|
|
script, _ := smartcontract.CreateCallWithAssertScript(Hash, "vote", account, param)
|
||
|
|
return script
|
||
|
|
}
|
||
|
|
|
||
|
|
// SetGasPerBlock creates and sends a transaction that sets the new amount of
|
||
|
|
// GAS to be generated in each block. The action is successful when transaction
|
||
|
|
// ends in HALT state. Notice that this setting can be changed only by the
|
||
|
|
// network's committee, so use an appropriate Actor. The returned values are
|
||
|
|
// transaction hash, its ValidUntilBlock value and an error if any.
|
||
|
|
func (c *Contract) SetGasPerBlock(gas int64) (util.Uint256, uint32, error) {
|
||
|
|
return c.actor.SendCall(Hash, setGasMethod, gas)
|
||
|
|
}
|
||
|
|
|
||
|
|
// SetGasPerBlockTransaction creates a transaction that sets the new amount of
|
||
|
|
// GAS to be generated in each block. The action is successful when transaction
|
||
|
|
// ends in HALT state. Notice that this setting can be changed only by the
|
||
|
|
// network's committee, so use an appropriate Actor. The transaction is signed,
|
||
|
|
// but not sent to the network, instead it's returned to the caller.
|
||
|
|
func (c *Contract) SetGasPerBlockTransaction(gas int64) (*transaction.Transaction, error) {
|
||
|
|
return c.actor.MakeCall(Hash, setGasMethod, gas)
|
||
|
|
}
|
||
|
|
|
||
|
|
// SetGasPerBlockUnsigned creates a transaction that sets the new amount of
|
||
|
|
// GAS to be generated in each block. The action is successful when transaction
|
||
|
|
// ends in HALT state. Notice that this setting can be changed only by the
|
||
|
|
// network's committee, so use an appropriate Actor. The transaction is not
|
||
|
|
// signed and just returned to the caller.
|
||
|
|
func (c *Contract) SetGasPerBlockUnsigned(gas int64) (*transaction.Transaction, error) {
|
||
|
|
return c.actor.MakeUnsignedCall(Hash, setGasMethod, nil, gas)
|
||
|
|
}
|
||
|
|
|
||
|
|
// SetRegisterPrice creates and sends a transaction that sets the new candidate
|
||
|
|
// registration price (in GAS). The action is successful when transaction
|
||
|
|
// ends in HALT state. Notice that this setting can be changed only by the
|
||
|
|
// network's committee, so use an appropriate Actor. The returned values are
|
||
|
|
// transaction hash, its ValidUntilBlock value and an error if any.
|
||
|
|
func (c *Contract) SetRegisterPrice(price int64) (util.Uint256, uint32, error) {
|
||
|
|
return c.actor.SendCall(Hash, setRegMethod, price)
|
||
|
|
}
|
||
|
|
|
||
|
|
// SetRegisterPriceTransaction creates a transaction that sets the new candidate
|
||
|
|
// registration price (in GAS). The action is successful when transaction
|
||
|
|
// ends in HALT state. Notice that this setting can be changed only by the
|
||
|
|
// network's committee, so use an appropriate Actor. The transaction is signed,
|
||
|
|
// but not sent to the network, instead it's returned to the caller.
|
||
|
|
func (c *Contract) SetRegisterPriceTransaction(price int64) (*transaction.Transaction, error) {
|
||
|
|
return c.actor.MakeCall(Hash, setRegMethod, price)
|
||
|
|
}
|
||
|
|
|
||
|
|
// SetRegisterPriceUnsigned creates a transaction that sets the new candidate
|
||
|
|
// registration price (in GAS). The action is successful when transaction
|
||
|
|
// ends in HALT state. Notice that this setting can be changed only by the
|
||
|
|
// network's committee, so use an appropriate Actor. The transaction is not
|
||
|
|
// signed and just returned to the caller.
|
||
|
|
func (c *Contract) SetRegisterPriceUnsigned(price int64) (*transaction.Transaction, error) {
|
||
|
|
return c.actor.MakeUnsignedCall(Hash, setRegMethod, nil, price)
|
||
|
|
}
|