mirror of
https://gitlab.com/pulsechaincom/erigon-pulse.git
synced 2025-01-01 00:31:21 +00:00
367 lines
14 KiB
Go
367 lines
14 KiB
Go
/*
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Copyright 2021 Erigon contributors
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package txpool
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import (
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"encoding/binary"
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"fmt"
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"hash"
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"math/bits"
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"github.com/holiman/uint256"
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"github.com/ledgerwatch/erigon-lib/gointerfaces/types"
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"github.com/ledgerwatch/erigon-lib/rlp"
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"github.com/ledgerwatch/secp256k1"
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"golang.org/x/crypto/sha3"
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)
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type PeerID *types.H512
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type Hashes []byte // flatten list of 32-byte hashes
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// TxContext is object that is required to parse transactions and turn transaction payload into TxSlot objects
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// usage of TxContext helps avoid extra memory allocations
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type TxParseContext struct {
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recCtx *secp256k1.Context // Context for sender recovery
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keccak1 hash.Hash
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keccak2 hash.Hash
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chainId, r, s uint256.Int // Signature values
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n27, n28, n35 uint256.Int
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buf [65]byte // buffer needs to be enough for hashes (32 bytes) and for public key (65 bytes)
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sighash [32]byte
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sig [65]byte
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}
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func NewTxParseContext() *TxParseContext {
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ctx := &TxParseContext{
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keccak1: sha3.NewLegacyKeccak256(),
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keccak2: sha3.NewLegacyKeccak256(),
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recCtx: secp256k1.NewContext(),
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}
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ctx.n27.SetUint64(27)
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ctx.n28.SetUint64(28)
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ctx.n35.SetUint64(35)
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return ctx
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}
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// TxSlot contains information extracted from an Ethereum transaction, which is enough to manage it inside the transaction.
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// Also, it contains some auxillary information, like ephemeral fields, and indices within priority queues
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type TxSlot struct {
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//txId uint64 // Transaction id (distinct from transaction hash), used as a compact reference to a transaction accross data structures
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//senderId uint64 // Sender id (distinct from sender address), used as a compact referecne to to a sender accross data structures
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nonce uint64 // Nonce of the transaction
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tip uint64 // Maximum tip that transaction is giving to miner/block proposer
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feeCap uint64 // Maximum fee that transaction burns and gives to the miner/block proposer
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gas uint64 // Gas limit of the transaction
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value uint256.Int // Value transferred by the transaction
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idHash [32]byte // Transaction hash for the purposes of using it as a transaction Id
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sender [20]byte // Sender address for the transaction, recovered from the signature
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creation bool // Set to true if "To" field of the transation is not set
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dataLen int // Length of transaction's data (for calculation of intrinsic gas)
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alAddrCount int // Number of addresses in the access list
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alStorCount int // Number of storage keys in the access list
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//bestIdx int // Index of the transaction in the best priority queue (of whatever pool it currently belongs to)
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//worstIdx int // Index of the transaction in the worst priority queue (of whatever pook it currently belongs to)
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//local bool // Whether transaction has been injected locally (and hence needs priority when mining or proposing a block)
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}
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const (
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LegacyTxType int = 0
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AccessListTxType int = 1
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DynamicFeeTxType int = 2
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)
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const ParseTransactionErrorPrefix = "parse transaction payload"
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// ParseTransaction extracts all the information from the transactions's payload (RLP) necessary to build TxSlot
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// it also performs syntactic validation of the transactions
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func (ctx *TxParseContext) ParseTransaction(payload []byte, pos int) (*TxSlot, int, error) {
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if len(payload) == 0 {
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return nil, 0, fmt.Errorf("%s: empty rlp", ParseTransactionErrorPrefix)
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}
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// Compute transaction hash
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ctx.keccak1.Reset()
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ctx.keccak2.Reset()
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var slot TxSlot
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// Legacy transations have list Prefix, whereas EIP-2718 transactions have string Prefix
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// therefore we assign the first returned value of Prefix function (list) to legacy variable
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dataPos, dataLen, legacy, err := rlp.Prefix(payload, pos)
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if err != nil {
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return nil, 0, fmt.Errorf("%s: size Prefix: %v", ParseTransactionErrorPrefix, err)
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}
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if dataPos+dataLen != len(payload) {
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return nil, 0, fmt.Errorf("%s: transaction must be either 1 list or 1 string", ParseTransactionErrorPrefix)
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}
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p := dataPos
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var txType int
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// If it is non-legacy transaction, the transaction type follows, and then the the list
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if !legacy {
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txType = int(payload[p])
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if _, err = ctx.keccak1.Write(payload[p : p+1]); err != nil {
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return nil, 0, fmt.Errorf("%s: computing idHash (hashing type Prefix): %w", ParseTransactionErrorPrefix, err)
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}
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if _, err = ctx.keccak2.Write(payload[p : p+1]); err != nil {
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return nil, 0, fmt.Errorf("%s: computing signHash (hashing type Prefix): %w", ParseTransactionErrorPrefix, err)
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}
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p++
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if p >= len(payload) {
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return nil, 0, fmt.Errorf("%s: unexpected end of payload after txType", ParseTransactionErrorPrefix)
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}
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dataPos, dataLen, err = rlp.List(payload, p)
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if err != nil {
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return nil, 0, fmt.Errorf("%s: envelope Prefix: %v", ParseTransactionErrorPrefix, err)
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}
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// Hash the envelope, not the full payload
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if _, err = ctx.keccak1.Write(payload[p : dataPos+dataLen]); err != nil {
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return nil, 0, fmt.Errorf("%s: computing idHash (hashing the envelope): %w", ParseTransactionErrorPrefix, err)
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}
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p = dataPos
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}
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// Remember where signing hash data begins (it will need to be wrapped in an RLP list)
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sigHashPos := p
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// If it is non-legacy tx, chainId follows, but we skip it
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if !legacy {
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dataPos, dataLen, err = rlp.String(payload, p)
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if err != nil {
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return nil, 0, fmt.Errorf("%s: chainId len: %w", ParseTransactionErrorPrefix, err)
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}
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p = dataPos + dataLen
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}
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// Next follows the nonce, which we need to parse
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p, slot.nonce, err = rlp.U64(payload, p)
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if err != nil {
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return nil, 0, fmt.Errorf("%s: nonce: %w", ParseTransactionErrorPrefix, err)
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}
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// Next follows gas price or tip
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// Although consensus rules specify that tip can be up to 256 bit long, we narrow it to 64 bit
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p, slot.tip, err = rlp.U64(payload, p)
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if err != nil {
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return nil, 0, fmt.Errorf("%s: tip: %w", ParseTransactionErrorPrefix, err)
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}
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// Next follows feeCap, but only for dynamic fee transactions, for legacy transaction, it is
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// equal to tip
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if txType < DynamicFeeTxType {
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slot.feeCap = slot.tip
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} else {
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// Although consensus rules specify that feeCap can be up to 256 bit long, we narrow it to 64 bit
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p, slot.feeCap, err = rlp.U64(payload, p)
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if err != nil {
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return nil, 0, fmt.Errorf("%s: feeCap: %w", ParseTransactionErrorPrefix, err)
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}
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}
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// Next follows gas
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p, slot.gas, err = rlp.U64(payload, p)
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if err != nil {
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return nil, 0, fmt.Errorf("%s: gas: %w", ParseTransactionErrorPrefix, err)
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}
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// Next follows the destrination address (if present)
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dataPos, dataLen, err = rlp.String(payload, p)
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if err != nil {
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return nil, 0, fmt.Errorf("%s: to len: %w", ParseTransactionErrorPrefix, err)
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}
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if dataLen != 0 && dataLen != 20 {
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return nil, 0, fmt.Errorf("%s: unexpected length of to field: %d", ParseTransactionErrorPrefix, dataLen)
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}
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// Only note if To field is empty or not
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slot.creation = dataLen == 0
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p = dataPos + dataLen
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// Next follows value
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p, err = rlp.U256(payload, p, &slot.value)
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if err != nil {
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return nil, 0, fmt.Errorf("%s: value: %w", ParseTransactionErrorPrefix, err)
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}
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// Next goes data, but we are only interesting in its length
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dataPos, dataLen, err = rlp.String(payload, p)
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if err != nil {
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return nil, 0, fmt.Errorf("%s: data len: %w", ParseTransactionErrorPrefix, err)
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}
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slot.dataLen = dataLen
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p = dataPos + dataLen
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// Next follows access list for non-legacy transactions, we are only interesting in number of addresses and storage keys
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if !legacy {
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dataPos, dataLen, err = rlp.List(payload, p)
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if err != nil {
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return nil, 0, fmt.Errorf("%s: access list len: %w", ParseTransactionErrorPrefix, err)
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}
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tuplePos := dataPos
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var tupleLen int
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for tuplePos < dataPos+dataLen {
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tuplePos, tupleLen, err = rlp.List(payload, tuplePos)
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if err != nil {
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return nil, 0, fmt.Errorf("%s: tuple len: %w", ParseTransactionErrorPrefix, err)
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}
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var addrPos int
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addrPos, err = rlp.StringOfLen(payload, tuplePos, 20)
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if err != nil {
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return nil, 0, fmt.Errorf("%s: tuple addr len: %w", ParseTransactionErrorPrefix, err)
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}
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slot.alAddrCount++
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var storagePos, storageLen int
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storagePos, storageLen, err = rlp.List(payload, addrPos+20)
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if err != nil {
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return nil, 0, fmt.Errorf("%s: storage key list len: %w", ParseTransactionErrorPrefix, err)
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}
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skeyPos := storagePos
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for skeyPos < storagePos+storageLen {
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skeyPos, err = rlp.StringOfLen(payload, skeyPos, 32)
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if err != nil {
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return nil, 0, fmt.Errorf("%s: tuple storage key len: %w", ParseTransactionErrorPrefix, err)
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}
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slot.alStorCount++
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skeyPos += 32
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}
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if skeyPos != storagePos+storageLen {
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return nil, 0, fmt.Errorf("%s: extraneous space in the tuple after storage key list", ParseTransactionErrorPrefix)
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}
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tuplePos += tupleLen
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}
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if tuplePos != dataPos+dataLen {
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return nil, 0, fmt.Errorf("%s: extraneous space in the access list after all tuples", ParseTransactionErrorPrefix)
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}
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p = dataPos + dataLen
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}
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// This is where the data for sighash ends
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// Next follows V of the signature
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var vByte byte
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sigHashEnd := p
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sigHashLen := uint(sigHashEnd - sigHashPos)
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var chainIdBits, chainIdLen int
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if legacy {
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p, err = rlp.U256(payload, p, &ctx.chainId)
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if err != nil {
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return nil, 0, fmt.Errorf("%s: V: %w", ParseTransactionErrorPrefix, err)
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}
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// Compute chainId from V
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if ctx.chainId.Eq(&ctx.n27) || ctx.chainId.Eq(&ctx.n28) {
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// Do not add chain id and two extra zeros
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vByte = byte(ctx.chainId.Uint64() - 27)
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} else {
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ctx.chainId.Sub(&ctx.chainId, &ctx.n35)
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vByte = byte(1 - (ctx.chainId.Uint64() & 1))
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ctx.chainId.Rsh(&ctx.chainId, 1)
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chainIdBits = ctx.chainId.BitLen()
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if chainIdBits <= 7 {
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chainIdLen = 1
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} else {
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chainIdLen = (chainIdBits + 7) / 8 // It is always < 56 bytes
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sigHashLen++ // For chainId len Prefix
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}
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sigHashLen += uint(chainIdLen) // For chainId
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sigHashLen += 2 // For two extra zeros
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}
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} else {
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var v uint64
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p, v, err = rlp.U64(payload, p)
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if err != nil {
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return nil, 0, fmt.Errorf("%s: V: %w", ParseTransactionErrorPrefix, err)
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}
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if v > 1 {
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return nil, 0, fmt.Errorf("%s: V is loo large: %d", ParseTransactionErrorPrefix, v)
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}
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vByte = byte(v)
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}
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// Next follows R of the signature
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p, err = rlp.U256(payload, p, &ctx.r)
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if err != nil {
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return nil, 0, fmt.Errorf("%s: R: %w", ParseTransactionErrorPrefix, err)
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}
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// New follows S of the signature
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p, err = rlp.U256(payload, p, &ctx.s)
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if err != nil {
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return nil, 0, fmt.Errorf("%s: S: %w", ParseTransactionErrorPrefix, err)
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}
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// For legacy transactions, hash the full payload
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if legacy {
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if _, err = ctx.keccak1.Write(payload[pos:p]); err != nil {
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return nil, 0, fmt.Errorf("%s: computing idHash: %w", ParseTransactionErrorPrefix, err)
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}
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}
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ctx.keccak1.Sum(slot.idHash[:0])
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//ctx.keccak1.(io.Reader).Read(slot.idHash[:32])
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// Computing sigHash (hash used to recover sender from the signature)
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// Write len Prefix to the sighash
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if sigHashLen < 56 {
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ctx.buf[0] = byte(sigHashLen) + 192
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if _, err := ctx.keccak2.Write(ctx.buf[:1]); err != nil {
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return nil, 0, fmt.Errorf("%s: computing signHash (hashing len Prefix): %w", ParseTransactionErrorPrefix, err)
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}
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} else {
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beLen := (bits.Len(uint(sigHashLen)) + 7) / 8
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binary.BigEndian.PutUint64(ctx.buf[1:], uint64(sigHashLen))
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ctx.buf[8-beLen] = byte(beLen) + 247
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if _, err := ctx.keccak2.Write(ctx.buf[8-beLen : 9]); err != nil {
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return nil, 0, fmt.Errorf("%s: computing signHash (hashing len Prefix): %w", ParseTransactionErrorPrefix, err)
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}
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}
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if _, err = ctx.keccak2.Write(payload[sigHashPos:sigHashEnd]); err != nil {
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return nil, 0, fmt.Errorf("%s: computing signHash: %w", ParseTransactionErrorPrefix, err)
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}
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if legacy {
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if chainIdLen > 0 {
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if chainIdBits <= 7 {
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ctx.buf[0] = byte(ctx.chainId.Uint64())
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if _, err := ctx.keccak2.Write(ctx.buf[:1]); err != nil {
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return nil, 0, fmt.Errorf("%s: computing signHash (hashing legacy chainId): %w", ParseTransactionErrorPrefix, err)
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}
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} else {
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binary.BigEndian.PutUint64(ctx.buf[1:9], ctx.chainId[3])
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binary.BigEndian.PutUint64(ctx.buf[9:17], ctx.chainId[2])
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binary.BigEndian.PutUint64(ctx.buf[17:25], ctx.chainId[1])
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binary.BigEndian.PutUint64(ctx.buf[25:33], ctx.chainId[0])
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ctx.buf[32-chainIdLen] = 128 + byte(chainIdLen)
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if _, err = ctx.keccak2.Write(ctx.buf[32-chainIdLen : 33]); err != nil {
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return nil, 0, fmt.Errorf("%s: computing signHash (hashing legacy chainId): %w", ParseTransactionErrorPrefix, err)
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}
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}
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// Encode two zeros
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ctx.buf[0] = 128
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ctx.buf[1] = 128
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if _, err := ctx.keccak2.Write(ctx.buf[:2]); err != nil {
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return nil, 0, fmt.Errorf("%s: computing signHash (hashing zeros after legacy chainId): %w", ParseTransactionErrorPrefix, err)
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}
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}
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}
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// Squeeze sighash
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//ctx.keccak2.(io.Reader).Read(ctx.sighash[:32])
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ctx.keccak2.Sum(ctx.sighash[:0])
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binary.BigEndian.PutUint64(ctx.sig[0:8], ctx.r[3])
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binary.BigEndian.PutUint64(ctx.sig[8:16], ctx.r[2])
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binary.BigEndian.PutUint64(ctx.sig[16:24], ctx.r[1])
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binary.BigEndian.PutUint64(ctx.sig[24:32], ctx.r[0])
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binary.BigEndian.PutUint64(ctx.sig[32:40], ctx.s[3])
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binary.BigEndian.PutUint64(ctx.sig[40:48], ctx.s[2])
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binary.BigEndian.PutUint64(ctx.sig[48:56], ctx.s[1])
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binary.BigEndian.PutUint64(ctx.sig[56:64], ctx.s[0])
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ctx.sig[64] = vByte
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// recover sender
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if _, err = secp256k1.RecoverPubkeyWithContext(ctx.recCtx, ctx.sighash[:], ctx.sig[:], ctx.buf[:0]); err != nil {
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return nil, 0, fmt.Errorf("%s: recovering sender from signature: %w", ParseTransactionErrorPrefix, err)
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}
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//apply keccak to the public key
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ctx.keccak2.Reset()
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if _, err = ctx.keccak2.Write(ctx.buf[1:65]); err != nil {
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return nil, 0, fmt.Errorf("%s: computing sender from public key: %w", ParseTransactionErrorPrefix, err)
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}
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// squeeze the hash of the public key
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ctx.keccak2.Sum(ctx.buf[:0])
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//ctx.keccak2.(io.Reader).Read(ctx.buf[:32])
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//take last 20 bytes as address
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copy(slot.sender[:], ctx.buf[12:32])
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return &slot, p, nil
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}
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