248 lines
11 KiB
Go
248 lines
11 KiB
Go
// Copyright 2023 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package txpool
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import (
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"crypto/sha256"
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"fmt"
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"math/big"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/core"
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"github.com/ethereum/go-ethereum/core/state"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/crypto/kzg4844"
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"github.com/ethereum/go-ethereum/log"
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"github.com/ethereum/go-ethereum/params"
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)
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// ValidationOptions define certain differences between transaction validation
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// across the different pools without having to duplicate those checks.
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type ValidationOptions struct {
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Config *params.ChainConfig // Chain configuration to selectively validate based on current fork rules
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Accept uint8 // Bitmap of transaction types that should be accepted for the calling pool
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MaxSize uint64 // Maximum size of a transaction that the caller can meaningfully handle
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MinTip *big.Int // Minimum gas tip needed to allow a transaction into the caller pool
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}
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// ValidateTransaction is a helper method to check whether a transaction is valid
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// according to the consensus rules, but does not check state-dependent validation
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// (balance, nonce, etc).
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//
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// This check is public to allow different transaction pools to check the basic
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// rules without duplicating code and running the risk of missed updates.
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func ValidateTransaction(tx *types.Transaction, head *types.Header, signer types.Signer, opts *ValidationOptions) error {
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// Ensure transactions not implemented by the calling pool are rejected
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if opts.Accept&(1<<tx.Type()) == 0 {
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return fmt.Errorf("%w: tx type %v not supported by this pool", core.ErrTxTypeNotSupported, tx.Type())
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}
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// Before performing any expensive validations, sanity check that the tx is
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// smaller than the maximum limit the pool can meaningfully handle
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if tx.Size() > opts.MaxSize {
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return fmt.Errorf("%w: transaction size %v, limit %v", ErrOversizedData, tx.Size(), opts.MaxSize)
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}
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// Ensure only transactions that have been enabled are accepted
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if !opts.Config.IsBerlin(head.Number) && tx.Type() != types.LegacyTxType {
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return fmt.Errorf("%w: type %d rejected, pool not yet in Berlin", core.ErrTxTypeNotSupported, tx.Type())
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}
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if !opts.Config.IsLondon(head.Number) && tx.Type() == types.DynamicFeeTxType {
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return fmt.Errorf("%w: type %d rejected, pool not yet in London", core.ErrTxTypeNotSupported, tx.Type())
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}
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if !opts.Config.IsCancun(head.Number, head.Time) && tx.Type() == types.BlobTxType {
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return fmt.Errorf("%w: type %d rejected, pool not yet in Cancun", core.ErrTxTypeNotSupported, tx.Type())
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}
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// Check whether the init code size has been exceeded
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if opts.Config.IsShanghai(head.Number, head.Time) && tx.To() == nil && len(tx.Data()) > params.MaxInitCodeSize {
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return fmt.Errorf("%w: code size %v, limit %v", core.ErrMaxInitCodeSizeExceeded, len(tx.Data()), params.MaxInitCodeSize)
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}
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// Transactions can't be negative. This may never happen using RLP decoded
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// transactions but may occur for transactions created using the RPC.
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if tx.Value().Sign() < 0 {
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return ErrNegativeValue
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}
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// Ensure the transaction doesn't exceed the current block limit gas
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if head.GasLimit < tx.Gas() {
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return ErrGasLimit
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}
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// Sanity check for extremely large numbers (supported by RLP or RPC)
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if tx.GasFeeCap().BitLen() > 256 {
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return core.ErrFeeCapVeryHigh
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}
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if tx.GasTipCap().BitLen() > 256 {
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return core.ErrTipVeryHigh
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}
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// Ensure gasFeeCap is greater than or equal to gasTipCap
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if tx.GasFeeCapIntCmp(tx.GasTipCap()) < 0 {
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return core.ErrTipAboveFeeCap
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}
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// Make sure the transaction is signed properly
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if _, err := types.Sender(signer, tx); err != nil {
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return ErrInvalidSender
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}
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// Ensure the transaction has more gas than the bare minimum needed to cover
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// the transaction metadata
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intrGas, err := core.IntrinsicGas(tx.Data(), tx.AccessList(), tx.To() == nil, true, opts.Config.IsIstanbul(head.Number), opts.Config.IsShanghai(head.Number, head.Time))
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if err != nil {
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return err
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}
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if tx.Gas() < intrGas {
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return fmt.Errorf("%w: needed %v, allowed %v", core.ErrIntrinsicGas, intrGas, tx.Gas())
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}
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// Ensure the gasprice is high enough to cover the requirement of the calling
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// pool and/or block producer
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if tx.GasTipCapIntCmp(opts.MinTip) < 0 {
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return fmt.Errorf("%w: tip needed %v, tip permitted %v", ErrUnderpriced, opts.MinTip, tx.GasTipCap())
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}
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// Ensure blob transactions have valid commitments
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if tx.Type() == types.BlobTxType {
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sidecar := tx.BlobTxSidecar()
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if sidecar == nil {
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return fmt.Errorf("missing sidecar in blob transaction")
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}
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// Ensure the number of items in the blob transaction and vairous side
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// data match up before doing any expensive validations
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hashes := tx.BlobHashes()
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if len(hashes) == 0 {
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return fmt.Errorf("blobless blob transaction")
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}
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if len(hashes) > params.MaxBlobGasPerBlock/params.BlobTxBlobGasPerBlob {
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return fmt.Errorf("too many blobs in transaction: have %d, permitted %d", len(hashes), params.MaxBlobGasPerBlock/params.BlobTxBlobGasPerBlob)
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}
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if err := validateBlobSidecar(hashes, sidecar); err != nil {
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return err
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}
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}
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return nil
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}
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func validateBlobSidecar(hashes []common.Hash, sidecar *types.BlobTxSidecar) error {
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if len(sidecar.Blobs) != len(hashes) {
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return fmt.Errorf("invalid number of %d blobs compared to %d blob hashes", len(sidecar.Blobs), len(hashes))
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}
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if len(sidecar.Commitments) != len(hashes) {
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return fmt.Errorf("invalid number of %d blob commitments compared to %d blob hashes", len(sidecar.Commitments), len(hashes))
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}
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if len(sidecar.Proofs) != len(hashes) {
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return fmt.Errorf("invalid number of %d blob proofs compared to %d blob hashes", len(sidecar.Proofs), len(hashes))
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}
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// Blob quantities match up, validate that the provers match with the
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// transaction hash before getting to the cryptography
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hasher := sha256.New()
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for i, want := range hashes {
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hasher.Write(sidecar.Commitments[i][:])
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hash := hasher.Sum(nil)
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hasher.Reset()
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var vhash common.Hash
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vhash[0] = params.BlobTxHashVersion
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copy(vhash[1:], hash[1:])
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if vhash != want {
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return fmt.Errorf("blob %d: computed hash %#x mismatches transaction one %#x", i, vhash, want)
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}
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}
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// Blob commitments match with the hashes in the transaction, verify the
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// blobs themselves via KZG
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for i := range sidecar.Blobs {
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if err := kzg4844.VerifyBlobProof(sidecar.Blobs[i], sidecar.Commitments[i], sidecar.Proofs[i]); err != nil {
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return fmt.Errorf("invalid blob %d: %v", i, err)
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}
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}
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return nil
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}
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// ValidationOptionsWithState define certain differences between stateful transaction
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// validation across the different pools without having to duplicate those checks.
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type ValidationOptionsWithState struct {
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State *state.StateDB // State database to check nonces and balances against
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// FirstNonceGap is an optional callback to retrieve the first nonce gap in
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// the list of pooled transactions of a specific account. If this method is
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// set, nonce gaps will be checked and forbidden. If this method is not set,
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// nonce gaps will be ignored and permitted.
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FirstNonceGap func(addr common.Address) uint64
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// UsedAndLeftSlots is a mandatory callback to retrieve the number of tx slots
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// used and the number still permitted for an account. New transactions will
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// be rejected once the number of remaining slots reaches zero.
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UsedAndLeftSlots func(addr common.Address) (int, int)
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// ExistingExpenditure is a mandatory callback to retrieve the cumulative
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// cost of the already pooled transactions to check for overdrafts.
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ExistingExpenditure func(addr common.Address) *big.Int
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// ExistingCost is a mandatory callback to retrieve an already pooled
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// transaction's cost with the given nonce to check for overdrafts.
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ExistingCost func(addr common.Address, nonce uint64) *big.Int
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}
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// ValidateTransactionWithState is a helper method to check whether a transaction
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// is valid according to the pool's internal state checks (balance, nonce, gaps).
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//
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// This check is public to allow different transaction pools to check the stateful
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// rules without duplicating code and running the risk of missed updates.
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func ValidateTransactionWithState(tx *types.Transaction, signer types.Signer, opts *ValidationOptionsWithState) error {
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// Ensure the transaction adheres to nonce ordering
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from, err := signer.Sender(tx) // already validated (and cached), but cleaner to check
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if err != nil {
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log.Error("Transaction sender recovery failed", "err", err)
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return err
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}
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next := opts.State.GetNonce(from)
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if next > tx.Nonce() {
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return fmt.Errorf("%w: next nonce %v, tx nonce %v", core.ErrNonceTooLow, next, tx.Nonce())
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}
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// Ensure the transaction doesn't produce a nonce gap in pools that do not
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// support arbitrary orderings
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if opts.FirstNonceGap != nil {
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if gap := opts.FirstNonceGap(from); gap < tx.Nonce() {
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return fmt.Errorf("%w: tx nonce %v, gapped nonce %v", core.ErrNonceTooHigh, tx.Nonce(), gap)
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}
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}
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// Ensure the transactor has enough funds to cover the transaction costs
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var (
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balance = opts.State.GetBalance(from)
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cost = tx.Cost()
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)
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if balance.Cmp(cost) < 0 {
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return fmt.Errorf("%w: balance %v, tx cost %v, overshot %v", core.ErrInsufficientFunds, balance, cost, new(big.Int).Sub(cost, balance))
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}
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// Ensure the transactor has enough funds to cover for replacements or nonce
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// expansions without overdrafts
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spent := opts.ExistingExpenditure(from)
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if prev := opts.ExistingCost(from, tx.Nonce()); prev != nil {
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bump := new(big.Int).Sub(cost, prev)
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need := new(big.Int).Add(spent, bump)
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if balance.Cmp(need) < 0 {
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return fmt.Errorf("%w: balance %v, queued cost %v, tx bumped %v, overshot %v", core.ErrInsufficientFunds, balance, spent, bump, new(big.Int).Sub(need, balance))
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}
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} else {
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need := new(big.Int).Add(spent, cost)
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if balance.Cmp(need) < 0 {
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return fmt.Errorf("%w: balance %v, queued cost %v, tx cost %v, overshot %v", core.ErrInsufficientFunds, balance, spent, cost, new(big.Int).Sub(need, balance))
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}
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// Transaction takes a new nonce value out of the pool. Ensure it doesn't
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// overflow the number of permitted transactions from a single account
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// (i.e. max cancellable via out-of-bound transaction).
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if used, left := opts.UsedAndLeftSlots(from); left <= 0 {
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return fmt.Errorf("%w: pooled %d txs", ErrAccountLimitExceeded, used)
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}
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}
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return nil
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}
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