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tx_mempool_verifier.go
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tx_mempool_verifier.go
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// Copyright (C) 2019-2022, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package executor
import (
"errors"
"fmt"
"time"
"github.com/ava-labs/avalanchego/ids"
"github.com/ava-labs/avalanchego/vms/platformvm/state"
"github.com/ava-labs/avalanchego/vms/platformvm/txs"
)
var _ txs.Visitor = (*MempoolTxVerifier)(nil)
type MempoolTxVerifier struct {
*Backend
ParentID ids.ID
StateVersions state.Versions
Tx *txs.Tx
}
func (*MempoolTxVerifier) AdvanceTimeTx(*txs.AdvanceTimeTx) error {
return errWrongTxType
}
func (*MempoolTxVerifier) RewardValidatorTx(*txs.RewardValidatorTx) error {
return errWrongTxType
}
func (v *MempoolTxVerifier) AddValidatorTx(tx *txs.AddValidatorTx) error {
return v.standardTx(tx)
}
func (v *MempoolTxVerifier) AddSubnetValidatorTx(tx *txs.AddSubnetValidatorTx) error {
return v.standardTx(tx)
}
func (v *MempoolTxVerifier) AddDelegatorTx(tx *txs.AddDelegatorTx) error {
return v.standardTx(tx)
}
func (v *MempoolTxVerifier) CreateChainTx(tx *txs.CreateChainTx) error {
return v.standardTx(tx)
}
func (v *MempoolTxVerifier) CreateSubnetTx(tx *txs.CreateSubnetTx) error {
return v.standardTx(tx)
}
func (v *MempoolTxVerifier) ImportTx(tx *txs.ImportTx) error {
return v.standardTx(tx)
}
func (v *MempoolTxVerifier) ExportTx(tx *txs.ExportTx) error {
return v.standardTx(tx)
}
func (v *MempoolTxVerifier) RemoveSubnetValidatorTx(tx *txs.RemoveSubnetValidatorTx) error {
return v.standardTx(tx)
}
func (v *MempoolTxVerifier) TransformSubnetTx(tx *txs.TransformSubnetTx) error {
return v.standardTx(tx)
}
func (v *MempoolTxVerifier) AddPermissionlessValidatorTx(tx *txs.AddPermissionlessValidatorTx) error {
return v.standardTx(tx)
}
func (v *MempoolTxVerifier) AddPermissionlessDelegatorTx(tx *txs.AddPermissionlessDelegatorTx) error {
return v.standardTx(tx)
}
func (v *MempoolTxVerifier) standardTx(tx txs.UnsignedTx) error {
baseState, err := v.standardBaseState()
if err != nil {
return err
}
executor := StandardTxExecutor{
Backend: v.Backend,
State: baseState,
Tx: v.Tx,
}
err = tx.Visit(&executor)
// We ignore [errFutureStakeTime] here because the time will be advanced
// when this transaction is issued.
if errors.Is(err, errFutureStakeTime) {
return nil
}
return err
}
// Upon Banff activation, txs are not verified against current chain time
// but against the block timestamp. [baseTime] calculates
// the right timestamp to be used to mempool tx verification
func (v *MempoolTxVerifier) standardBaseState() (state.Diff, error) {
state, err := state.NewDiff(v.ParentID, v.StateVersions)
if err != nil {
return nil, err
}
nextBlkTime, err := v.nextBlockTime(state)
if err != nil {
return nil, err
}
if !v.Backend.Config.IsBanffActivated(nextBlkTime) {
// next tx would be included into an Apricot block
// so we verify it against current chain state
return state, nil
}
// next tx would be included into a Banff block
// so we verify it against duly updated chain state
changes, err := AdvanceTimeTo(v.Backend, state, nextBlkTime)
if err != nil {
return nil, err
}
changes.Apply(state)
state.SetTimestamp(nextBlkTime)
return state, nil
}
func (v *MempoolTxVerifier) nextBlockTime(state state.Diff) (time.Time, error) {
var (
parentTime = state.GetTimestamp()
nextBlkTime = v.Clk.Time()
)
if parentTime.After(nextBlkTime) {
nextBlkTime = parentTime
}
nextStakerChangeTime, err := GetNextStakerChangeTime(state)
if err != nil {
return time.Time{}, fmt.Errorf("could not calculate next staker change time: %w", err)
}
if !nextBlkTime.Before(nextStakerChangeTime) {
nextBlkTime = nextStakerChangeTime
}
return nextBlkTime, nil
}