Validations for celo txs in txpool

core/txpool/blobpool/blobpool.go

@@ -311,6 +311,9 @@ type BlobPool struct {
 	eventScope event.SubscriptionScope // Event scope to track and mass unsubscribe on termination
 
 	lock sync.RWMutex // Mutex protecting the pool during reorg handling
+
+	// Celo
+	feeCurrencyValidator txpool.FeeCurrencyValidator
 }
 
 // New creates a new blob transaction pool to gather, sort and filter inbound
@@ -327,6 +330,8 @@ func New(config Config, chain BlockChain) *BlobPool {
 		lookup: make(map[common.Hash]uint64),
 		index:  make(map[common.Address][]*blobTxMeta),
 		spent:  make(map[common.Address]*uint256.Int),
+
+		feeCurrencyValidator: txpool.NewFeeCurrencyValidator(),
 	}
 }
 
@@ -1024,13 +1029,14 @@ func (p *BlobPool) SetGasTip(tip *big.Int) {
 func (p *BlobPool) validateTx(tx *types.Transaction) error {
 	// Ensure the transaction adheres to basic pool filters (type, size, tip) and
 	// consensus rules
-	baseOpts := &txpool.ValidationOptions{
-		Config:  p.chain.Config(),
-		Accept:  1 << types.BlobTxType,
-		MaxSize: txMaxSize,
-		MinTip:  p.gasTip.ToBig(),
-	}
-	if err := txpool.ValidateTransaction(tx, p.head, p.signer, baseOpts); err != nil {
+	baseOpts := &txpool.CeloValidationOptions{
+		Config:    p.chain.Config(),
+		AcceptSet: txpool.NewAcceptSet(types.BlobTxType),
+		MaxSize:   txMaxSize,
+		MinTip:    p.gasTip.ToBig(),
+	}
+	var fcv txpool.FeeCurrencyValidator = nil // TODO: create with proper value
+	if err := txpool.CeloValidateTransaction(tx, p.head, p.signer, baseOpts, p.state, fcv); err != nil {
 		return err
 	}
 	// Ensure the transaction adheres to the stateful pool filters (nonce, balance)
@@ -1064,7 +1070,14 @@ func (p *BlobPool) validateTx(tx *types.Transaction) error {
 			return nil
 		},
 	}
-	if err := txpool.ValidateTransactionWithState(tx, p.signer, stateOpts); err != nil {
+
+	// Adapt to celo validation options
+	celoOpts := &txpool.CeloValidationOptionsWithState{
+		ValidationOptionsWithState: *stateOpts,
+		FeeCurrencyValidator:       p.feeCurrencyValidator,
+	}
+
+	if err := txpool.ValidateTransactionWithState(tx, p.signer, celoOpts); err != nil {
 		return err
 	}
 	// If the transaction replaces an existing one, ensure that price bumps are

core/txpool/celo_validation.go

@@ -0,0 +1,110 @@
+package txpool
+
+import (
+	"errors"
+	"math/big"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/state"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/params"
+)
+
+var NonWhitelistedFeeCurrencyError = errors.New("Fee currency given is not whitelisted at current block")
+
+// FeeCurrencyValidator validates currency whitelisted status at the specified
+// block number.
+type FeeCurrencyValidator interface {
+	IsWhitelisted(st *state.StateDB, feeCurrency *common.Address) bool
+	// Balance returns the feeCurrency balance of the address specified, in the given state.
+	// If feeCurrency is nil, the native currency balance has to be returned.
+	Balance(st *state.StateDB, address common.Address, feeCurrency *common.Address) *big.Int
+}
+
+func NewFeeCurrencyValidator() FeeCurrencyValidator {
+	return &feeval{}
+}
+
+type feeval struct {
+}
+
+func (f *feeval) IsWhitelisted(st *state.StateDB, feeCurrency *common.Address) bool {
+	// TODO: implement proper validation for all currencies
+	// Hardcoded for the moment
+	return true
+	//return feeCurrency == nil
+}
+
+func (f *feeval) Balance(st *state.StateDB, address common.Address, feeCurrency *common.Address) *big.Int {
+	// TODO: implement proper balance retrieval for fee currencies
+	return st.GetBalance(address)
+}
+
+// AcceptSet is a set of accepted transaction types for a transaction subpool.
+type AcceptSet = map[uint8]struct{}
+
+// CeloValidationOptions define certain differences between transaction validation
+// across the different pools without having to duplicate those checks.
+// In comparison to the standard ValidationOptions, the Accept field has been
+// changed to allow to test for CeloDynamicFeeTx types.
+type CeloValidationOptions struct {
+	Config *params.ChainConfig // Chain configuration to selectively validate based on current fork rules
+
+	AcceptSet AcceptSet // Set of transaction types that should be accepted for the calling pool
+	MaxSize   uint64    // Maximum size of a transaction that the caller can meaningfully handle
+	MinTip    *big.Int  // Minimum gas tip needed to allow a transaction into the caller pool
+}
+
+// NewAcceptSet creates a new AcceptSet with the types provided.
+func NewAcceptSet(types ...uint8) AcceptSet {
+	m := make(AcceptSet, len(types))
+	for _, t := range types {
+		m[t] = struct{}{}
+	}
+	return m
+}
+
+// Accepts returns true iff txType is accepted by this CeloValidationOptions.
+func (cvo *CeloValidationOptions) Accepts(txType uint8) bool {
+	_, ok := cvo.AcceptSet[txType]
+	return ok
+}
+
+// CeloValidateTransaction is a helper method to check whether a transaction is valid
+// according to the consensus rules, but does not check state-dependent validation
+// (balance, nonce, etc).
+//
+// This check is public to allow different transaction pools to check the basic
+// rules without duplicating code and running the risk of missed updates.
+func CeloValidateTransaction(tx *types.Transaction, head *types.Header,
+	signer types.Signer, opts *CeloValidationOptions, st *state.StateDB, fcv FeeCurrencyValidator) error {
+	if err := ValidateTransaction(tx, head, signer, opts); err != nil {
+		return err
+	}
+	if IsFeeCurrencyTx(tx) {
+		if !fcv.IsWhitelisted(st, tx.FeeCurrency()) {
+			return NonWhitelistedFeeCurrencyError
+		}
+	}
+	return nil
+}
+
+// IsFeeCurrencyTxType returns true if and only if the transaction type
+// given can handle custom gas fee currencies.
+func IsFeeCurrencyTxType(t uint8) bool {
+	return t == types.CeloDynamicFeeTxType
+}
+
+// IsFeeCurrencyTx returns true if this transaction specifies a custom
+// gas fee currency.
+func IsFeeCurrencyTx(tx *types.Transaction) bool {
+	return IsFeeCurrencyTxType(tx.Type()) && tx.FeeCurrency() != nil
+}
+
+// See: txpool.ValidationOptionsWithState
+type CeloValidationOptionsWithState struct {
+	ValidationOptionsWithState
+
+	// FeeCurrencyValidator allows for balance check of non native fee currencies.
+	FeeCurrencyValidator FeeCurrencyValidator
+}

core/txpool/legacypool/legacypool.go

@@ -241,6 +241,9 @@ type LegacyPool struct {
 	changesSinceReorg int // A counter for how many drops we've performed in-between reorg.
 
 	l1CostFn txpool.L1CostFunc // To apply L1 costs as rollup, optional field, may be nil.
+
+	// Celo
+	feeCurrencyValidator txpool.FeeCurrencyValidator
 }
 
 type txpoolResetRequest struct {
@@ -269,6 +272,9 @@ func New(config Config, chain BlockChain) *LegacyPool {
 		reorgDoneCh:     make(chan chan struct{}),
 		reorgShutdownCh: make(chan struct{}),
 		initDoneCh:      make(chan struct{}),
+
+		// CELO fields
+		feeCurrencyValidator: txpool.NewFeeCurrencyValidator(),
 	}
 	pool.locals = newAccountSet(pool.signer)
 	for _, addr := range config.Locals {
@@ -603,19 +609,20 @@ func (pool *LegacyPool) local() map[common.Address]types.Transactions {
 // This check is meant as an early check which only needs to be performed once,
 // and does not require the pool mutex to be held.
 func (pool *LegacyPool) validateTxBasics(tx *types.Transaction, local bool) error {
-	opts := &txpool.ValidationOptions{
+	opts := &txpool.CeloValidationOptions{
 		Config: pool.chainconfig,
-		Accept: 0 |
-			1<<types.LegacyTxType |
-			1<<types.AccessListTxType |
-			1<<types.DynamicFeeTxType,
+		AcceptSet: txpool.NewAcceptSet(
+			types.LegacyTxType,
+			types.AccessListTxType,
+			types.DynamicFeeTxType,
+			types.CeloDynamicFeeTxType),
 		MaxSize: txMaxSize,
 		MinTip:  pool.gasTip.Load(),
 	}
 	if local {
 		opts.MinTip = new(big.Int)
 	}
-	if err := txpool.ValidateTransaction(tx, pool.currentHead.Load(), pool.signer, opts); err != nil {
+	if err := txpool.CeloValidateTransaction(tx, pool.currentHead.Load(), pool.signer, opts, pool.currentState, pool.feeCurrencyValidator); err != nil {
 		return err
 	}
 	return nil
@@ -660,7 +667,14 @@ func (pool *LegacyPool) validateTx(tx *types.Transaction, local bool) error {
 		},
 		L1CostFn: pool.l1CostFn,
 	}
-	if err := txpool.ValidateTransactionWithState(tx, pool.signer, opts); err != nil {
+
+	// Adapt to celo validation options
+	celoOpts := &txpool.CeloValidationOptionsWithState{
+		ValidationOptionsWithState: *opts,
+		FeeCurrencyValidator:       pool.feeCurrencyValidator,
+	}
+
+	if err := txpool.ValidateTransactionWithState(tx, pool.signer, celoOpts); err != nil {
 		return err
 	}
 	return nil

core/txpool/validation.go

@@ -62,15 +62,16 @@ type ValidationOptions struct {
 //
 // This check is public to allow different transaction pools to check the basic
 // rules without duplicating code and running the risk of missed updates.
-func ValidateTransaction(tx *types.Transaction, head *types.Header, signer types.Signer, opts *ValidationOptions) error {
+// ONLY TO BE CALLED FROM "CeloValidateTransaction"
+func ValidateTransaction(tx *types.Transaction, head *types.Header, signer types.Signer, opts *CeloValidationOptions) error {
 	// No unauthenticated deposits allowed in the transaction pool.
 	// This is for spam protection, not consensus,
 	// as the external engine-API user authenticates deposits.
 	if tx.Type() == types.DepositTxType {
 		return core.ErrTxTypeNotSupported
 	}
 	// Ensure transactions not implemented by the calling pool are rejected
-	if opts.Accept&(1<<tx.Type()) == 0 {
+	if !opts.Accepts(tx.Type()) {
 		return fmt.Errorf("%w: tx type %v not supported by this pool", core.ErrTxTypeNotSupported, tx.Type())
 	}
 	// Before performing any expensive validations, sanity check that the tx is
@@ -221,7 +222,7 @@ type ValidationOptionsWithState struct {
 //
 // This check is public to allow different transaction pools to check the stateful
 // rules without duplicating code and running the risk of missed updates.
-func ValidateTransactionWithState(tx *types.Transaction, signer types.Signer, opts *ValidationOptionsWithState) error {
+func ValidateTransactionWithState(tx *types.Transaction, signer types.Signer, opts *CeloValidationOptionsWithState) error {
 	// Ensure the transaction adheres to nonce ordering
 	from, err := signer.Sender(tx) // already validated (and cached), but cleaner to check
 	if err != nil {
@@ -241,7 +242,7 @@ func ValidateTransactionWithState(tx *types.Transaction, signer types.Signer, op
 	}
 	// Ensure the transactor has enough funds to cover the transaction costs
 	var (
-		balance = opts.State.GetBalance(from)
+		balance = opts.FeeCurrencyValidator.Balance(opts.State, from, tx.FeeCurrency())
 		cost    = tx.Cost()
 	)
 	if opts.L1CostFn != nil {