145 lines
4.5 KiB
Go
145 lines
4.5 KiB
Go
// Package verify contains RPC wrappers for verify contract.
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package verify
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import (
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"errors"
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"fmt"
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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/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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// Hash contains contract hash.
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var Hash = util.Uint160{0x33, 0x22, 0x11, 0x0, 0xff, 0xee, 0xdd, 0xcc, 0xbb, 0xaa, 0x99, 0x88, 0x77, 0x66, 0x55, 0x44, 0x33, 0x22, 0x11, 0x0}
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// HelloWorldEvent represents "Hello world!" event emitted by the contract.
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type HelloWorldEvent struct {
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Args []any
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}
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// Actor is used by Contract to call state-changing methods.
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type Actor interface {
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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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// Contract implements all contract methods.
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type Contract struct {
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actor Actor
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hash util.Uint160
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}
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// New creates an instance of Contract using Hash and the given Actor.
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func New(actor Actor) *Contract {
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var hash = Hash
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return &Contract{actor, hash}
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}
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func (c *Contract) scriptForVerify() ([]byte, error) {
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return smartcontract.CreateCallWithAssertScript(c.hash, "verify")
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}
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// Verify creates a transaction invoking `verify` method of the contract.
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// This transaction is signed and immediately sent to the network.
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// The values returned are its hash, ValidUntilBlock value and error if any.
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func (c *Contract) Verify() (util.Uint256, uint32, error) {
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script, err := c.scriptForVerify()
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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.SendRun(script)
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}
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// VerifyTransaction creates a transaction invoking `verify` method of the contract.
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// This transaction is signed, but not sent to the network, instead it's
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// returned to the caller.
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func (c *Contract) VerifyTransaction() (*transaction.Transaction, error) {
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script, err := c.scriptForVerify()
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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.MakeRun(script)
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}
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// VerifyUnsigned creates a transaction invoking `verify` method of the contract.
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// This transaction is not signed, it's simply returned to the caller.
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// Any fields of it that do not affect fees can be changed (ValidUntilBlock,
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// Nonce), fee values (NetworkFee, SystemFee) can be increased as well.
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func (c *Contract) VerifyUnsigned() (*transaction.Transaction, error) {
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script, err := c.scriptForVerify()
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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.MakeUnsignedRun(script, nil)
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}
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// HelloWorldEventsFromApplicationLog retrieves a set of all emitted events
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// with "Hello world!" name from the provided [result.ApplicationLog].
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func HelloWorldEventsFromApplicationLog(log *result.ApplicationLog) ([]*HelloWorldEvent, error) {
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if log == nil {
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return nil, errors.New("nil application log")
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}
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var res []*HelloWorldEvent
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for i, ex := range log.Executions {
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for j, e := range ex.Events {
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if e.Name != "Hello world!" {
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continue
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}
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event := new(HelloWorldEvent)
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err := event.FromStackItem(e.Item)
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if err != nil {
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return nil, fmt.Errorf("failed to deserialize HelloWorldEvent from stackitem (execution #%d, event #%d): %w", i, j, err)
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}
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res = append(res, event)
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}
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}
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return res, nil
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}
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// FromStackItem converts provided [stackitem.Array] to HelloWorldEvent or
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// returns an error if it's not possible to do to so.
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func (e *HelloWorldEvent) FromStackItem(item *stackitem.Array) error {
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if item == nil {
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return errors.New("nil item")
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}
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arr, ok := item.Value().([]stackitem.Item)
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if !ok {
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return errors.New("not an array")
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}
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if len(arr) != 1 {
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return errors.New("wrong number of structure elements")
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}
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var (
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index = -1
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err error
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)
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index++
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e.Args, err = func(item stackitem.Item) ([]any, error) {
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arr, ok := item.Value().([]stackitem.Item)
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if !ok {
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return nil, errors.New("not an array")
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}
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res := make([]any, len(arr))
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for i := range res {
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res[i], err = arr[i].Value(), error(nil)
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if err != nil {
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return nil, fmt.Errorf("item %d: %w", i, err)
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}
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}
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return res, nil
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}(arr[index])
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if err != nil {
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return fmt.Errorf("field Args: %w", err)
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}
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return nil
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}
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