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consensus.go
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consensus.go
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// (c) 2019-2020, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package dummy
import (
"bytes"
"errors"
"fmt"
"math/big"
"time"
"github.com/kukrer/coreth/consensus"
"github.com/kukrer/coreth/core/state"
"github.com/kukrer/coreth/core/types"
"github.com/kukrer/coreth/params"
"github.com/kukrer/coreth/rpc"
"github.com/kukrer/coreth/trie"
"github.com/ethereum/go-ethereum/common"
)
var (
allowedFutureBlockTime = 10 * time.Second // Max time from current time allowed for blocks, before they're considered future blocks
errInvalidBlockTime = errors.New("timestamp less than parent's")
errUnclesUnsupported = errors.New("uncles unsupported")
errBlockGasCostNil = errors.New("block gas cost is nil")
errBlockGasCostTooLarge = errors.New("block gas cost is not uint64")
errBaseFeeNil = errors.New("base fee is nil")
errExtDataGasUsedNil = errors.New("extDataGasUsed is nil")
errExtDataGasUsedTooLarge = errors.New("extDataGasUsed is not uint64")
)
type Mode uint
const (
ModeSkipHeader Mode = 1 // Skip over header verification
ModeSkipBlockFee Mode = 2 // Skip block fee verification
)
type (
OnFinalizeAndAssembleCallbackType = func(header *types.Header, state *state.StateDB, txs []*types.Transaction) (extraData []byte, blockFeeContribution *big.Int, extDataGasUsed *big.Int, err error)
OnAPIsCallbackType = func(consensus.ChainHeaderReader) []rpc.API
OnExtraStateChangeType = func(block *types.Block, statedb *state.StateDB) (blockFeeContribution *big.Int, extDataGasUsed *big.Int, err error)
ConsensusCallbacks struct {
OnFinalizeAndAssemble OnFinalizeAndAssembleCallbackType
OnExtraStateChange OnExtraStateChangeType
}
DummyEngine struct {
cb *ConsensusCallbacks
consensusMode Mode
}
)
func NewDummyEngine(cb *ConsensusCallbacks) *DummyEngine {
return &DummyEngine{
cb: cb,
}
}
func NewETHFaker() *DummyEngine {
return &DummyEngine{
cb: new(ConsensusCallbacks),
consensusMode: ModeSkipBlockFee,
}
}
func NewComplexETHFaker(cb *ConsensusCallbacks) *DummyEngine {
return &DummyEngine{
cb: cb,
consensusMode: ModeSkipBlockFee,
}
}
func NewFaker() *DummyEngine {
return NewDummyEngine(new(ConsensusCallbacks))
}
func NewFullFaker() *DummyEngine {
return &DummyEngine{
cb: new(ConsensusCallbacks),
consensusMode: ModeSkipHeader,
}
}
func (self *DummyEngine) verifyHeaderGasFields(config *params.ChainConfig, header *types.Header, parent *types.Header) error {
timestamp := new(big.Int).SetUint64(header.Time)
// Verify that the gas limit is <= 2^63-1
if header.GasLimit > params.MaxGasLimit {
return fmt.Errorf("invalid gasLimit: have %v, max %v", header.GasLimit, params.MaxGasLimit)
}
// Verify that the gasUsed is <= gasLimit
if header.GasUsed > header.GasLimit {
return fmt.Errorf("invalid gasUsed: have %d, gasLimit %d", header.GasUsed, header.GasLimit)
}
if config.IsApricotPhase1(timestamp) {
if header.GasLimit != params.ApricotPhase1GasLimit {
return fmt.Errorf("expected gas limit to be %d, but found %d", params.ApricotPhase1GasLimit, header.GasLimit)
}
} else {
// Verify that the gas limit remains within allowed bounds
diff := int64(parent.GasLimit) - int64(header.GasLimit)
if diff < 0 {
diff *= -1
}
limit := parent.GasLimit / params.GasLimitBoundDivisor
if uint64(diff) >= limit || header.GasLimit < params.MinGasLimit {
return fmt.Errorf("invalid gas limit: have %d, want %d += %d", header.GasLimit, parent.GasLimit, limit)
}
}
if !config.IsApricotPhase3(timestamp) {
// Verify BaseFee is not present before AP3
if header.BaseFee != nil {
return fmt.Errorf("invalid baseFee before fork: have %d, want <nil>", header.BaseFee)
}
} else {
// Verify baseFee and rollupWindow encoding as part of header verification
// starting in AP3
expectedRollupWindowBytes, expectedBaseFee, err := CalcBaseFee(config, parent, header.Time)
if err != nil {
return fmt.Errorf("failed to calculate base fee: %w", err)
}
if !bytes.Equal(expectedRollupWindowBytes, header.Extra) {
return fmt.Errorf("expected rollup window bytes: %x, found %x", expectedRollupWindowBytes, header.Extra)
}
if header.BaseFee == nil {
return errors.New("expected baseFee to be non-nil")
}
if bfLen := header.BaseFee.BitLen(); bfLen > 256 {
return fmt.Errorf("too large base fee: bitlen %d", bfLen)
}
if header.BaseFee.Cmp(expectedBaseFee) != 0 {
return fmt.Errorf("expected base fee (%d), found (%d)", expectedBaseFee, header.BaseFee)
}
}
// Verify BlockGasCost, ExtDataGasUsed not present before AP4
if !config.IsApricotPhase4(timestamp) {
if header.BlockGasCost != nil {
return fmt.Errorf("invalid blockGasCost before fork: have %d, want <nil>", header.BlockGasCost)
}
if header.ExtDataGasUsed != nil {
return fmt.Errorf("invalid extDataGasUsed before fork: have %d, want <nil>", header.ExtDataGasUsed)
}
return nil
}
// Enforce BlockGasCost constraints
blockGasCostStep := ApricotPhase4BlockGasCostStep
if config.IsApricotPhase5(timestamp) {
blockGasCostStep = ApricotPhase5BlockGasCostStep
}
expectedBlockGasCost := calcBlockGasCost(
ApricotPhase4TargetBlockRate,
ApricotPhase4MinBlockGasCost,
ApricotPhase4MaxBlockGasCost,
blockGasCostStep,
parent.BlockGasCost,
parent.Time, header.Time,
)
if header.BlockGasCost == nil {
return errBlockGasCostNil
}
if !header.BlockGasCost.IsUint64() {
return errBlockGasCostTooLarge
}
if header.BlockGasCost.Cmp(expectedBlockGasCost) != 0 {
return fmt.Errorf("invalid block gas cost: have %d, want %d", header.BlockGasCost, expectedBlockGasCost)
}
// ExtDataGasUsed correctness is checked during block validation
// (when the validator has access to the block contents)
if header.ExtDataGasUsed == nil {
return errExtDataGasUsedNil
}
if !header.ExtDataGasUsed.IsUint64() {
return errExtDataGasUsedTooLarge
}
return nil
}
// modified from consensus.go
func (self *DummyEngine) verifyHeader(chain consensus.ChainHeaderReader, header *types.Header, parent *types.Header, uncle bool) error {
var (
config = chain.Config()
timestamp = new(big.Int).SetUint64(header.Time)
)
// Ensure that we do not verify an uncle
if uncle {
return errUnclesUnsupported
}
// Ensure that the header's extra-data section is of a reasonable size
if !config.IsApricotPhase3(timestamp) {
if uint64(len(header.Extra)) > params.MaximumExtraDataSize {
return fmt.Errorf("extra-data too long: %d > %d", len(header.Extra), params.MaximumExtraDataSize)
}
} else {
if uint64(len(header.Extra)) != params.ApricotPhase3ExtraDataSize {
return fmt.Errorf("expected extra-data field to be: %d, but found %d", params.ApricotPhase3ExtraDataSize, len(header.Extra))
}
}
// Ensure gas-related header fields are correct
if err := self.verifyHeaderGasFields(config, header, parent); err != nil {
return err
}
// Verify the header's timestamp
if header.Time > uint64(time.Now().Add(allowedFutureBlockTime).Unix()) {
return consensus.ErrFutureBlock
}
//if header.Time <= parent.Time {
if header.Time < parent.Time {
return errInvalidBlockTime
}
// Verify that the block number is parent's +1
if diff := new(big.Int).Sub(header.Number, parent.Number); diff.Cmp(big.NewInt(1)) != 0 {
return consensus.ErrInvalidNumber
}
return nil
}
func (self *DummyEngine) Author(header *types.Header) (common.Address, error) {
return header.Coinbase, nil
}
func (self *DummyEngine) VerifyHeader(chain consensus.ChainHeaderReader, header *types.Header) error {
// If we're running a full engine faking, accept any input as valid
if self.consensusMode == ModeSkipHeader {
return nil
}
// Short circuit if the header is known, or it's parent not
number := header.Number.Uint64()
if chain.GetHeader(header.Hash(), number) != nil {
return nil
}
parent := chain.GetHeader(header.ParentHash, number-1)
if parent == nil {
return consensus.ErrUnknownAncestor
}
// Sanity checks passed, do a proper verification
return self.verifyHeader(chain, header, parent, false)
}
func (self *DummyEngine) VerifyUncles(chain consensus.ChainReader, block *types.Block) error {
if len(block.Uncles()) > 0 {
return errUnclesUnsupported
}
return nil
}
func (self *DummyEngine) Prepare(chain consensus.ChainHeaderReader, header *types.Header) error {
header.Difficulty = big.NewInt(1)
return nil
}
func (self *DummyEngine) verifyBlockFee(
baseFee *big.Int,
requiredBlockGasCost *big.Int,
txs []*types.Transaction,
receipts []*types.Receipt,
extraStateChangeContribution *big.Int,
) error {
if self.consensusMode == ModeSkipBlockFee {
return nil
}
if baseFee == nil || baseFee.Sign() <= 0 {
return fmt.Errorf("invalid base fee (%d) in apricot phase 4", baseFee)
}
if requiredBlockGasCost == nil || !requiredBlockGasCost.IsUint64() {
return fmt.Errorf("invalid block gas cost (%d) in apricot phase 4", requiredBlockGasCost)
}
var (
gasUsed = new(big.Int)
blockFeeContribution = new(big.Int)
totalBlockFee = new(big.Int)
)
// Add in the external contribution
if extraStateChangeContribution != nil {
if extraStateChangeContribution.Cmp(common.Big0) < 0 {
return fmt.Errorf("invalid extra state change contribution: %d", extraStateChangeContribution)
}
totalBlockFee.Add(totalBlockFee, extraStateChangeContribution)
}
// Calculate the total excess (denominated in AVAX) over the base fee that was paid towards the block fee
for i, receipt := range receipts {
// Each transaction contributes the excess over the baseFee towards the totalBlockFee
// This should be equivalent to the sum of the "priority fees" within EIP-1559.
txFeePremium, err := txs[i].EffectiveGasTip(baseFee)
if err != nil {
return err
}
// Multiply the [txFeePremium] by the gasUsed in the transaction since this gives the total AVAX that was paid
// above the amount required if the transaction had simply paid the minimum base fee for the block.
//
// Ex. LegacyTx paying a gas price of 100 gwei for 1M gas in a block with a base fee of 10 gwei.
// Total Fee = 100 gwei * 1M gas
// Minimum Fee = 10 gwei * 1M gas (minimum fee that would have been accepted for this transaction)
// Fee Premium = 90 gwei
// Total Overpaid = 90 gwei * 1M gas
blockFeeContribution.Mul(txFeePremium, gasUsed.SetUint64(receipt.GasUsed))
totalBlockFee.Add(totalBlockFee, blockFeeContribution)
}
// Calculate how much gas the [totalBlockFee] would purchase at the price level
// set by the base fee of this block.
blockGas := new(big.Int).Div(totalBlockFee, baseFee)
// Require that the amount of gas purchased by the effective tips within the block, [blockGas],
// covers at least [requiredBlockGasCost].
//
// NOTE: To determine the [requiredBlockFee], multiply [requiredBlockGasCost]
// by [baseFee].
if blockGas.Cmp(requiredBlockGasCost) < 0 {
return fmt.Errorf(
"insufficient gas (%d) to cover the block cost (%d) at base fee (%d) (total block fee: %d)",
blockGas, requiredBlockGasCost, baseFee, totalBlockFee,
)
}
return nil
}
func (self *DummyEngine) Finalize(chain consensus.ChainHeaderReader, block *types.Block, parent *types.Header, state *state.StateDB, receipts []*types.Receipt) error {
// Perform extra state change while finalizing the block
var (
contribution, extDataGasUsed *big.Int
err error
)
if self.cb.OnExtraStateChange != nil {
contribution, extDataGasUsed, err = self.cb.OnExtraStateChange(block, state)
if err != nil {
return err
}
}
if chain.Config().IsApricotPhase4(new(big.Int).SetUint64(block.Time())) {
// Validate extDataGasUsed and BlockGasCost match expectations
//
// NOTE: This is a duplicate check of what is already performed in
// blockValidator but is done here for symmetry with FinalizeAndAssemble.
if extDataGasUsed == nil {
extDataGasUsed = new(big.Int).Set(common.Big0)
}
if blockExtDataGasUsed := block.ExtDataGasUsed(); blockExtDataGasUsed == nil || !blockExtDataGasUsed.IsUint64() || blockExtDataGasUsed.Cmp(extDataGasUsed) != 0 {
return fmt.Errorf("invalid extDataGasUsed: have %d, want %d", blockExtDataGasUsed, extDataGasUsed)
}
blockGasCostStep := ApricotPhase4BlockGasCostStep
if chain.Config().IsApricotPhase5(new(big.Int).SetUint64(block.Time())) {
blockGasCostStep = ApricotPhase5BlockGasCostStep
}
// Calculate the expected blockGasCost for this block.
// Note: this is a deterministic transtion that defines an exact block fee for this block.
blockGasCost := calcBlockGasCost(
ApricotPhase4TargetBlockRate,
ApricotPhase4MinBlockGasCost,
ApricotPhase4MaxBlockGasCost,
blockGasCostStep,
parent.BlockGasCost,
parent.Time, block.Time(),
)
// Verify the BlockGasCost set in the header matches the calculated value.
if blockBlockGasCost := block.BlockGasCost(); blockBlockGasCost == nil || !blockBlockGasCost.IsUint64() || blockBlockGasCost.Cmp(blockGasCost) != 0 {
return fmt.Errorf("invalid blockGasCost: have %d, want %d", blockBlockGasCost, blockGasCost)
}
// Verify the block fee was paid.
if err := self.verifyBlockFee(
block.BaseFee(),
block.BlockGasCost(),
block.Transactions(),
receipts,
contribution,
); err != nil {
return err
}
}
return nil
}
func (self *DummyEngine) FinalizeAndAssemble(chain consensus.ChainHeaderReader, header *types.Header, parent *types.Header, state *state.StateDB, txs []*types.Transaction,
uncles []*types.Header, receipts []*types.Receipt) (*types.Block, error) {
var (
contribution, extDataGasUsed *big.Int
extraData []byte
err error
)
if self.cb.OnFinalizeAndAssemble != nil {
extraData, contribution, extDataGasUsed, err = self.cb.OnFinalizeAndAssemble(header, state, txs)
if err != nil {
return nil, err
}
}
if chain.Config().IsApricotPhase4(new(big.Int).SetUint64(header.Time)) {
header.ExtDataGasUsed = extDataGasUsed
if header.ExtDataGasUsed == nil {
header.ExtDataGasUsed = new(big.Int).Set(common.Big0)
}
blockGasCostStep := ApricotPhase4BlockGasCostStep
if chain.Config().IsApricotPhase5(new(big.Int).SetUint64(header.Time)) {
blockGasCostStep = ApricotPhase5BlockGasCostStep
}
// Calculate the required block gas cost for this block.
header.BlockGasCost = calcBlockGasCost(
ApricotPhase4TargetBlockRate,
ApricotPhase4MinBlockGasCost,
ApricotPhase4MaxBlockGasCost,
blockGasCostStep,
parent.BlockGasCost,
parent.Time, header.Time,
)
// Verify that this block covers the block fee.
if err := self.verifyBlockFee(
header.BaseFee,
header.BlockGasCost,
txs,
receipts,
contribution,
); err != nil {
return nil, err
}
}
// commit the final state root
header.Root = state.IntermediateRoot(chain.Config().IsEIP158(header.Number))
// Header seems complete, assemble into a block and return
return types.NewBlock(
header, txs, uncles, receipts, new(trie.Trie), extraData,
chain.Config().IsApricotPhase1(new(big.Int).SetUint64(header.Time)),
), nil
}
func (self *DummyEngine) CalcDifficulty(chain consensus.ChainHeaderReader, time uint64, parent *types.Header) *big.Int {
return big.NewInt(1)
}
func (self *DummyEngine) Close() error {
return nil
}