fix pre: separate implementation for TraceMany (#26)

eth/api_pre_exec.go

@@ -1,25 +1,178 @@
 package eth
 
 import (
-	"bytes"
 	"context"
 	"fmt"
+	"hash"
 	"math"
 	"math/big"
 
+	txtrace "github.com/DeBankDeFi/etherlib/pkg/txtracev1"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/common/hexutil"
 	"github.com/ethereum/go-ethereum/core"
+	"github.com/ethereum/go-ethereum/core/state"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/core/vm"
 	"github.com/ethereum/go-ethereum/internal/ethapi"
 	"github.com/ethereum/go-ethereum/rpc"
 
-	txtrace "github.com/DeBankDeFi/etherlib/pkg/txtracev1"
 	// "github.com/DeBankDeFi/eth/txtrace"
+	"golang.org/x/crypto/sha3"
 )
 
+type helpHash struct {
+	hashed hash.Hash
+}
+
+func newHash() *helpHash {
+
+	return &helpHash{hashed: sha3.NewLegacyKeccak256()}
+}
+
+func (h *helpHash) Reset() {
+	h.hashed.Reset()
+}
+
+func (h *helpHash) Update(key, val []byte) {
+	h.hashed.Write(key)
+	h.hashed.Write(val)
+}
+
+func (h *helpHash) Hash() common.Hash {
+	return common.BytesToHash(h.hashed.Sum(nil))
+}
+
 type PreExecTx struct {
+	ChainId                                     *big.Int
+	From, To, Data, Value, Gas, GasPrice, Nonce string
+}
+
+type preData struct {
+	block   *types.Block
+	tx      *types.Transaction
+	msg     types.Message
+	stateDb *state.StateDB
+	header  *types.Header
+}
+
+// PreExecAPI provides pre exec info for rpc
+type PreExecAPI struct {
+	e *Ethereum
+}
+
+func NewPreExecAPI(e *Ethereum) *PreExecAPI {
+	return &PreExecAPI{e: e}
+}
+
+func (api *PreExecAPI) getBlockAndMsg(origin *PreExecTx, number *big.Int) (*types.Block, types.Message) {
+	fromAddr := common.HexToAddress(origin.From)
+	toAddr := common.HexToAddress(origin.To)
+
+	tx := types.NewTx(&types.LegacyTx{
+		Nonce:    hexutil.MustDecodeUint64(origin.Nonce),
+		To:       &toAddr,
+		Value:    hexutil.MustDecodeBig(origin.Value),
+		Gas:      hexutil.MustDecodeUint64(origin.Gas),
+		GasPrice: hexutil.MustDecodeBig(origin.GasPrice),
+		Data:     hexutil.MustDecode(origin.Data),
+	})
+
+	number.Add(number, big.NewInt(1))
+	block := types.NewBlock(
+		&types.Header{Number: number},
+		[]*types.Transaction{tx}, nil, nil, newHash())
+
+	msg := types.NewMessage(
+		fromAddr,
+		&toAddr,
+		hexutil.MustDecodeUint64(origin.Nonce),
+		hexutil.MustDecodeBig(origin.Value),
+		hexutil.MustDecodeUint64(origin.Gas),
+		hexutil.MustDecodeBig(origin.GasPrice),
+		tx.GasFeeCap(),
+		tx.GasTipCap(),
+		hexutil.MustDecode(origin.Data),
+		nil, false, true,
+	)
+	return block, msg
+}
+
+func (api *PreExecAPI) prepareData(ctx context.Context, origin *PreExecTx) (*preData, error) {
+	var (
+		d   preData
+		err error
+	)
+	bc := api.e.blockchain
+	d.header, err = api.e.APIBackend.HeaderByNumber(ctx, rpc.LatestBlockNumber)
+	if err != nil {
+		return nil, err
+	}
+	latestNumber := d.header.Number
+	parent := api.e.blockchain.GetBlockByNumber(latestNumber.Uint64())
+	d.stateDb, err = state.New(parent.Header().Root, bc.StateCache(), bc.Snapshots())
+	if err != nil {
+		return nil, err
+	}
+	d.block, d.msg = api.getBlockAndMsg(origin, latestNumber)
+	d.tx = d.block.Transactions()[0]
+	return &d, nil
+}
+
+func (api *PreExecAPI) GetLogs(ctx context.Context, origin *PreExecTx) (*types.Receipt, error) {
+	var (
+		bc = api.e.blockchain
+	)
+	d, err := api.prepareData(ctx, origin)
+	if err != nil {
+		return nil, err
+	}
+	gas := d.tx.Gas()
+	gp := new(core.GasPool).AddGas(gas)
+
+	d.stateDb.Prepare(d.tx.Hash(), 0)
+	receipt, err := core.ApplyTransactionForPreExec(
+		bc.Config(), bc, nil, gp, d.stateDb, d.header, d.tx, d.msg, &gas, *bc.GetVMConfig())
+	if err != nil {
+		return nil, err
+	}
+	return receipt, receipt.Err
+}
+
+// TraceTransaction tracing pre-exec transaction object.
+func (api *PreExecAPI) TraceTransaction(ctx context.Context, origin *PreExecTx) (interface{}, error) {
+	var (
+		bc     = api.e.blockchain
+		tracer *txtrace.OeTracer
+		err    error
+	)
+	d, err := api.prepareData(ctx, origin)
+	if err != nil {
+		return nil, err
+	}
+	txContext := core.NewEVMTxContext(d.msg)
+	txIndex := 0
+
+	tracer = txtrace.NewOeTracer(nil)
+	// Run the transaction with tracing enabled.
+	vmenv := vm.NewEVM(core.NewEVMBlockContext(d.header, bc, nil), txContext, d.stateDb, bc.Config(), vm.Config{Debug: true, Tracer: tracer})
+	vmenv.Context.BaseFee = big.NewInt(0)
+
+	// Call Prepare to clear out the statedb access list
+	d.stateDb.Prepare(d.tx.Hash(), txIndex)
+
+	tracer.SetMessage(d.block.Number(), d.block.Hash(), d.tx.Hash(), uint(txIndex), d.msg.From(), d.msg.To(), *d.msg.Value())
+
+	_, err = core.ApplyMessage(vmenv, d.msg, new(core.GasPool).AddGas(d.msg.Gas()))
+	if err != nil {
+		return nil, fmt.Errorf("tracing failed: %v", err)
+	}
+
+	tracer.Finalize()
+	return tracer.GetResult(), nil
+}
+
+type PreArgs struct {
 	ChainId              *big.Int        `json:"chainId,omitempty"`
 	From                 *common.Address `json:"from"`
 	To                   *common.Address `json:"to"`
@@ -33,114 +186,12 @@ type PreExecTx struct {
 	Input                *hexutil.Bytes  `json:"input"`
 }
 
-type PreExecResult struct {
+type PreResult struct {
 	Trace *[]txtrace.ActionTrace `json:"trace"`
 	Logs  []*types.Log           `json:"logs"`
 }
 
-// PreExecAPI provides pre exec info for rpc
+func (api *PreExecAPI) TraceMany(ctx context.Context, origins []PreArgs) (*PreResult, error) {
-type PreExecAPI struct {
-	e *Ethereum
-}
-
-func NewPreExecAPI(e *Ethereum) *PreExecAPI {
-	return &PreExecAPI{e: e}
-}
-
-func (api *PreExecAPI) GetLogs(ctx context.Context, origin *PreExecTx) (*types.Receipt, error) {
-	state, header, err := api.e.APIBackend.StateAndHeaderByNumberOrHash(ctx, rpc.BlockNumberOrHashWithNumber(rpc.LatestBlockNumber))
-	if state == nil || err != nil {
-		return nil, err
-	}
-	txArgs := ethapi.TransactionArgs{
-		ChainID:              (*hexutil.Big)(big.NewInt(1)),
-		From:                 origin.From,
-		To:                   origin.To,
-		Gas:                  origin.Gas,
-		GasPrice:             origin.GasPrice,
-		MaxFeePerGas:         origin.MaxFeePerGas,
-		MaxPriorityFeePerGas: origin.MaxPriorityFeePerGas,
-		Value:                origin.Value,
-		Nonce:                origin.Nonce,
-		Data:                 origin.Data,
-		Input:                origin.Input,
-	}
-	// Get a new instance of the EVM.
-	msg, err := txArgs.ToMessage(0, header.BaseFee)
-	if err != nil {
-		return nil, err
-	}
-	evm, vmError, err := api.e.APIBackend.GetEVM(ctx, msg, state, header, &vm.Config{NoBaseFee: true})
-	if err != nil {
-		return nil, err
-	}
-	// Execute the message.
-	gp := new(core.GasPool).AddGas(math.MaxUint64)
-	result, err := core.ApplyMessage(evm, msg, gp)
-	if err := vmError(); err != nil {
-		return nil, err
-	}
-	if err != nil {
-		return nil, fmt.Errorf("err: %w (supplied gas %d)", err, msg.Gas())
-	}
-	receipt := types.NewReceipt(bytes.NewBufferString("").Bytes(), result.Failed(), result.UsedGas)
-	receipt.GasUsed = result.UsedGas
-	receipt.Logs = state.Logs()
-	receipt.BlockHash = header.Hash()
-	receipt.BlockNumber = header.Number
-	return receipt, nil
-}
-
-// TraceTransaction tracing pre-exec transaction object.
-func (api *PreExecAPI) TraceTransaction(ctx context.Context, origin *PreExecTx) (interface{}, error) {
-	state, header, err := api.e.APIBackend.StateAndHeaderByNumberOrHash(ctx, rpc.BlockNumberOrHashWithNumber(rpc.LatestBlockNumber))
-	if state == nil || err != nil {
-		return nil, err
-	}
-	txArgs := ethapi.TransactionArgs{
-		ChainID:              (*hexutil.Big)(big.NewInt(1)),
-		From:                 origin.From,
-		To:                   origin.To,
-		Gas:                  origin.Gas,
-		GasPrice:             origin.GasPrice,
-		MaxFeePerGas:         origin.MaxFeePerGas,
-		MaxPriorityFeePerGas: origin.MaxPriorityFeePerGas,
-		Value:                origin.Value,
-		Nonce:                origin.Nonce,
-		Data:                 origin.Data,
-		Input:                origin.Input,
-	}
-	// Get a new instance of the EVM.
-	msg, err := txArgs.ToMessage(0, header.BaseFee)
-	if err != nil {
-		return nil, err
-	}
-	tracer := txtrace.NewOeTracer(nil)
-	tracer.SetFrom(msg.From())
-	tracer.SetTo(msg.To())
-	tracer.SetValue(*msg.Value())
-	tracer.SetTxIndex(uint(0))
-	tracer.SetBlockNumber(header.Number)
-	tracer.SetBlockHash(header.Hash())
-	evm, vmError, err := api.e.APIBackend.GetEVM(ctx, msg, state, header, &vm.Config{NoBaseFee: true, Debug: true, Tracer: tracer})
-	if err != nil {
-		return nil, err
-	}
-	// Execute the message.
-	gp := new(core.GasPool).AddGas(math.MaxUint64)
-	result, err := core.ApplyMessage(evm, msg, gp)
-	if err := vmError(); err != nil {
-		return nil, err
-	}
-	if err != nil {
-		return nil, fmt.Errorf("err: %w (supplied gas %d)", err, msg.Gas())
-	}
-	tracer.SetGasUsed(result.UsedGas)
-	tracer.Finalize()
-	return tracer.GetResult(), nil
-}
-
-func (api *PreExecAPI) TraceMany(ctx context.Context, origins []PreExecTx) (*PreExecResult, error) {
 	state, header, err := api.e.APIBackend.StateAndHeaderByNumberOrHash(ctx, rpc.BlockNumberOrHashWithNumber(rpc.LatestBlockNumber))
 	if state == nil || err != nil {
 		return nil, err
@@ -222,5 +273,5 @@ func (api *PreExecAPI) TraceMany(ctx context.Context, origins []PreExecTx) (*Pre
 	}
 	tracer.SetGasUsed(result.UsedGas)
 	tracer.Finalize()
-	return &PreExecResult{Trace: tracer.GetResult(), Logs: state.GetLogs(txHash, header.Hash())}, nil
+	return &PreResult{Trace: tracer.GetResult(), Logs: state.GetLogs(txHash, header.Hash())}, nil
 }