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227 lines
10 KiB
Go
227 lines
10 KiB
Go
package actor
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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/util"
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"github.com/nspcc-dev/neo-go/pkg/vm/vmstate"
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)
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// TransactionCheckerModifier is a callback that receives the result of
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// test-invocation and the transaction that can perform the same invocation
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// on chain. This callback is accepted by methods that create transactions, it
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// can examine both arguments and return an error if there is anything wrong
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// there which will abort the creation process. Notice that when used this
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// callback is completely responsible for invocation result checking, including
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// checking for HALT execution state (so if you don't check for it in a callback
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// you can send a transaction that is known to end up in FAULT state). It can
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// also modify the transaction (see TransactionModifier).
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type TransactionCheckerModifier func(r *result.Invoke, t *transaction.Transaction) error
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// TransactionModifier is a callback that receives the transaction before
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// it's signed from a method that creates signed transactions. It can check
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// fees and other fields of the transaction and return an error if there is
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// anything wrong there which will abort the creation process. It also can modify
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// Nonce, SystemFee, NetworkFee and ValidUntilBlock values taking full
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// responsibility on the effects of these modifications (smaller fee values, too
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// low or too high ValidUntilBlock or bad Nonce can render transaction invalid).
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// Modifying other fields is not supported. Mostly it's useful for increasing
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// fee values since by default they're just enough for transaction to be
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// successfully accepted and executed.
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type TransactionModifier func(t *transaction.Transaction) error
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// DefaultModifier is the default modifier, it does nothing.
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func DefaultModifier(t *transaction.Transaction) error {
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return nil
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}
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// DefaultCheckerModifier is the default TransactionCheckerModifier, it checks
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// for HALT state in the invocation result given to it and does nothing else.
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func DefaultCheckerModifier(r *result.Invoke, t *transaction.Transaction) error {
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if r.State != vmstate.Halt.String() {
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return fmt.Errorf("script failed (%s state) due to an error: %s", r.State, r.FaultException)
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}
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return nil
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}
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// MakeCall creates a transaction that calls the given method of the given
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// contract with the given parameters. Test call is performed and filtered through
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// Actor-configured TransactionCheckerModifier. The resulting transaction has
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// Actor-configured attributes added as well. If you need to override attributes
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// and/or TransactionCheckerModifier use MakeTunedCall.
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func (a *Actor) MakeCall(contract util.Uint160, method string, params ...interface{}) (*transaction.Transaction, error) {
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return a.MakeTunedCall(contract, method, nil, nil, params...)
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}
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// MakeTunedCall creates a transaction with the given attributes (or Actor default
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// ones if nil) that calls the given method of the given contract with the given
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// parameters. It's filtered through the provided callback (or Actor default
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// one's if nil, see TransactionCheckerModifier documentation also), so the
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// process can be aborted and transaction can be modified before signing.
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func (a *Actor) MakeTunedCall(contract util.Uint160, method string, attrs []transaction.Attribute, txHook TransactionCheckerModifier, params ...interface{}) (*transaction.Transaction, error) {
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r, err := a.Call(contract, method, params...)
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return a.makeUncheckedWrapper(r, err, attrs, txHook)
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}
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// MakeRun creates a transaction with the given executable script. Test
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// invocation of this script is performed and filtered through Actor's
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// TransactionCheckerModifier. The resulting transaction has attributes that are
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// configured for current Actor. If you need to override them or use a different
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// TransactionCheckerModifier use MakeTunedRun.
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func (a *Actor) MakeRun(script []byte) (*transaction.Transaction, error) {
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return a.MakeTunedRun(script, nil, nil)
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}
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// MakeTunedRun creates a transaction with the given attributes (or Actor default
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// ones if nil) that executes the given script. It's filtered through the
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// provided callback (if not nil, otherwise Actor default one is used, see
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// TransactionCheckerModifier documentation also), so the process can be aborted
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// and transaction can be modified before signing.
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func (a *Actor) MakeTunedRun(script []byte, attrs []transaction.Attribute, txHook TransactionCheckerModifier) (*transaction.Transaction, error) {
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r, err := a.Run(script)
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return a.makeUncheckedWrapper(r, err, attrs, txHook)
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}
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func (a *Actor) makeUncheckedWrapper(r *result.Invoke, err error, attrs []transaction.Attribute, txHook TransactionCheckerModifier) (*transaction.Transaction, error) {
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if err != nil {
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return nil, fmt.Errorf("test invocation failed: %w", err)
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}
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return a.MakeUncheckedRun(r.Script, r.GasConsumed, attrs, func(tx *transaction.Transaction) error {
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if txHook == nil {
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txHook = a.opts.CheckerModifier
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}
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return txHook(r, tx)
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})
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}
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// MakeUncheckedRun creates a transaction with the given attributes (or Actor
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// default ones if nil) that executes the given script and is expected to use
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// up to sysfee GAS for its execution. The transaction is filtered through the
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// provided callback (or Actor default one, see TransactionModifier documentation
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// also), so the process can be aborted and transaction can be modified before
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// signing. This method is mostly useful when test invocation is already
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// performed and the script and required system fee values are already known.
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func (a *Actor) MakeUncheckedRun(script []byte, sysfee int64, attrs []transaction.Attribute, txHook TransactionModifier) (*transaction.Transaction, error) {
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tx, err := a.MakeUnsignedUncheckedRun(script, sysfee, attrs)
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if err != nil {
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return nil, err
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}
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if txHook == nil {
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txHook = a.opts.Modifier
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}
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err = txHook(tx)
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if err != nil {
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return nil, err
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}
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err = a.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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// MakeUnsignedCall creates an unsigned transaction with the given attributes
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// that calls the given method of the given contract with the given parameters.
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// Test-invocation is performed and is expected to end up in HALT state, the
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// transaction returned has correct SystemFee and NetworkFee values.
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// TransactionModifier is not applied to the result of this method, but default
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// attributes are used if attrs is nil.
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func (a *Actor) MakeUnsignedCall(contract util.Uint160, method string, attrs []transaction.Attribute, params ...interface{}) (*transaction.Transaction, error) {
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r, err := a.Call(contract, method, params...)
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return a.makeUnsignedWrapper(r, err, attrs)
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}
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// MakeUnsignedRun creates an unsigned transaction with the given attributes
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// that executes the given script. Test-invocation is performed and is expected
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// to end up in HALT state, the transaction returned has correct SystemFee and
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// NetworkFee values. TransactionModifier is not applied to the result of this
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// method, but default attributes are used if attrs is nil.
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func (a *Actor) MakeUnsignedRun(script []byte, attrs []transaction.Attribute) (*transaction.Transaction, error) {
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r, err := a.Run(script)
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return a.makeUnsignedWrapper(r, err, attrs)
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}
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func (a *Actor) makeUnsignedWrapper(r *result.Invoke, err error, attrs []transaction.Attribute) (*transaction.Transaction, error) {
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if err != nil {
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return nil, fmt.Errorf("failed to test-invoke: %w", err)
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}
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err = DefaultCheckerModifier(r, nil) // We know it doesn't care about transaction anyway.
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if err != nil {
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return nil, err
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}
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return a.MakeUnsignedUncheckedRun(r.Script, r.GasConsumed, attrs)
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}
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// MakeUnsignedUncheckedRun creates an unsigned transaction containing the given
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// script with the system fee value and attributes. It's expected to be used when
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// test invocation is already done and the script and system fee value are already
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// known to be good, so it doesn't do test invocation internally. But it fills
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// Signers with Actor's signers, calculates proper ValidUntilBlock and NetworkFee
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// values. The resulting transaction can be changed in its Nonce, SystemFee,
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// NetworkFee and ValidUntilBlock values and then be signed and sent or
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// exchanged via context.ParameterContext. TransactionModifier is not applied to
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// the result of this method, but default attributes are used if attrs is nil.
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func (a *Actor) MakeUnsignedUncheckedRun(script []byte, sysFee int64, attrs []transaction.Attribute) (*transaction.Transaction, error) {
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var err error
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if len(script) == 0 {
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return nil, errors.New("empty script")
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}
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if sysFee < 0 {
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return nil, errors.New("negative system fee")
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}
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if attrs == nil {
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attrs = a.opts.Attributes // Might as well be nil, but it's OK.
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}
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tx := transaction.New(script, sysFee)
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tx.Signers = a.txSigners
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tx.Attributes = attrs
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tx.ValidUntilBlock, err = a.CalculateValidUntilBlock()
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if err != nil {
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return nil, fmt.Errorf("calculating validUntilBlock: %w", err)
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}
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tx.Scripts = make([]transaction.Witness, len(a.signers))
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for i := range a.signers {
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if !a.signers[i].Account.Contract.Deployed {
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tx.Scripts[i].VerificationScript = a.signers[i].Account.Contract.Script
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}
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}
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// CalculateNetworkFee doesn't call Hash or Size, only serializes the
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// transaction via Bytes, so it's safe wrt internal caching.
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tx.NetworkFee, err = a.client.CalculateNetworkFee(tx)
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if err != nil {
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return nil, fmt.Errorf("calculating network fee: %w", err)
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}
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return tx, nil
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}
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// CalculateValidUntilBlock returns correct ValidUntilBlock value for a new
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// transaction relative to the current blockchain height. It uses "height +
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// number of validators + 1" formula suggesting shorter transaction lifetime
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// than the usual "height + MaxValidUntilBlockIncrement" approach. Shorter
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// lifetime can be useful to control transaction acceptance wait time because
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// it can't be added into a block after ValidUntilBlock.
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func (a *Actor) CalculateValidUntilBlock() (uint32, error) {
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blockCount, err := a.client.GetBlockCount()
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if err != nil {
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return 0, fmt.Errorf("can't get block count: %w", err)
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}
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var vc = int(a.version.Protocol.ValidatorsCount)
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var bestH = uint32(0)
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for h, n := range a.version.Protocol.ValidatorsHistory { // In case it's enabled.
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if h >= bestH && h <= blockCount {
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vc = n
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bestH = h
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}
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}
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return blockCount + uint32(vc+1), nil
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}
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