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api.go
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api.go
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// (c) 2019-2020, Ava Labs, Inc.
//
// This file is a derived work, based on the go-ethereum library whose original
// notices appear below.
//
// It is distributed under a license compatible with the licensing terms of the
// original code from which it is derived.
//
// Much love to the original authors for their work.
// **********
// Copyright 2021 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package tracers
import (
"bytes"
"context"
"encoding/json"
"errors"
"fmt"
"math/big"
"runtime"
"sync"
"time"
"github.com/ava-labs/subnet-evm/consensus"
"github.com/ava-labs/subnet-evm/core"
"github.com/ava-labs/subnet-evm/core/state"
"github.com/ava-labs/subnet-evm/core/types"
"github.com/ava-labs/subnet-evm/core/vm"
"github.com/ava-labs/subnet-evm/eth/tracers/logger"
"github.com/ava-labs/subnet-evm/ethdb"
"github.com/ava-labs/subnet-evm/internal/ethapi"
"github.com/ava-labs/subnet-evm/params"
"github.com/ava-labs/subnet-evm/rpc"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/rlp"
)
const (
// defaultTraceTimeout is the amount of time a single transaction can execute
// by default before being forcefully aborted.
defaultTraceTimeout = 5 * time.Second
// defaultTraceReexec is the number of blocks the tracer is willing to go back
// and reexecute to produce missing historical state necessary to run a specific
// trace.
defaultTraceReexec = uint64(128)
// defaultTracechainMemLimit is the size of the triedb, at which traceChain
// switches over and tries to use a disk-backed database instead of building
// on top of memory.
// For non-archive nodes, this limit _will_ be overblown, as disk-backed tries
// will only be found every ~15K blocks or so.
defaultTracechainMemLimit = common.StorageSize(500 * 1024 * 1024)
)
// Backend interface provides the common API services (that are provided by
// both full and light clients) with access to necessary functions.
type Backend interface {
HeaderByHash(ctx context.Context, hash common.Hash) (*types.Header, error)
HeaderByNumber(ctx context.Context, number rpc.BlockNumber) (*types.Header, error)
BlockByHash(ctx context.Context, hash common.Hash) (*types.Block, error)
BlockByNumber(ctx context.Context, number rpc.BlockNumber) (*types.Block, error)
BadBlocks() ([]*types.Block, []*core.BadBlockReason)
GetTransaction(ctx context.Context, txHash common.Hash) (*types.Transaction, common.Hash, uint64, uint64, error)
RPCGasCap() uint64
ChainConfig() *params.ChainConfig
Engine() consensus.Engine
ChainDb() ethdb.Database
StateAtBlock(ctx context.Context, block *types.Block, reexec uint64, base *state.StateDB, checkLive bool, preferDisk bool) (*state.StateDB, error)
StateAtTransaction(ctx context.Context, block *types.Block, txIndex int, reexec uint64) (core.Message, vm.BlockContext, *state.StateDB, error)
}
// API is the collection of tracing APIs exposed over the private debugging endpoint.
type API struct {
backend Backend
}
// NewAPI creates a new API definition for the tracing methods of the Ethereum service.
func NewAPI(backend Backend) *API {
return &API{backend: backend}
}
type chainContext struct {
api *API
ctx context.Context
}
func (context *chainContext) Engine() consensus.Engine {
return context.api.backend.Engine()
}
func (context *chainContext) GetHeader(hash common.Hash, number uint64) *types.Header {
header, err := context.api.backend.HeaderByNumber(context.ctx, rpc.BlockNumber(number))
if err != nil {
return nil
}
if header.Hash() == hash {
return header
}
header, err = context.api.backend.HeaderByHash(context.ctx, hash)
if err != nil {
return nil
}
return header
}
// chainContext constructs the context reader which is used by the evm for reading
// the necessary chain context.
func (api *API) chainContext(ctx context.Context) core.ChainContext {
return &chainContext{api: api, ctx: ctx}
}
// blockByNumber is the wrapper of the chain access function offered by the backend.
// It will return an error if the block is not found.
func (api *API) blockByNumber(ctx context.Context, number rpc.BlockNumber) (*types.Block, error) {
block, err := api.backend.BlockByNumber(ctx, number)
if err != nil {
return nil, err
}
if block == nil {
return nil, fmt.Errorf("block #%d not found", number)
}
return block, nil
}
// blockByHash is the wrapper of the chain access function offered by the backend.
// It will return an error if the block is not found.
func (api *API) blockByHash(ctx context.Context, hash common.Hash) (*types.Block, error) {
block, err := api.backend.BlockByHash(ctx, hash)
if err != nil {
return nil, err
}
if block == nil {
return nil, fmt.Errorf("block %s not found", hash.Hex())
}
return block, nil
}
// blockByNumberAndHash is the wrapper of the chain access function offered by
// the backend. It will return an error if the block is not found.
//
// Note this function is friendly for the light client which can only retrieve the
// historical(before the CHT) header/block by number.
func (api *API) blockByNumberAndHash(ctx context.Context, number rpc.BlockNumber, hash common.Hash) (*types.Block, error) {
block, err := api.blockByNumber(ctx, number)
if err != nil {
return nil, err
}
if block.Hash() == hash {
return block, nil
}
return api.blockByHash(ctx, hash)
}
// TraceConfig holds extra parameters to trace functions.
type TraceConfig struct {
*logger.Config
Tracer *string
Timeout *string
Reexec *uint64
// Config specific to given tracer. Note struct logger
// config are historically embedded in main object.
TracerConfig json.RawMessage
}
// TraceCallConfig is the config for traceCall API. It holds one more
// field to override the state for tracing.
type TraceCallConfig struct {
TraceConfig
StateOverrides *ethapi.StateOverride
BlockOverrides *ethapi.BlockOverrides
}
// StdTraceConfig holds extra parameters to standard-json trace functions.
type StdTraceConfig struct {
logger.Config
Reexec *uint64
TxHash common.Hash
}
// txTraceResult is the result of a single transaction trace.
type txTraceResult struct {
Result interface{} `json:"result,omitempty"` // Trace results produced by the tracer
Error string `json:"error,omitempty"` // Trace failure produced by the tracer
}
func (t *txTraceResult) String() string {
return fmt.Sprintf("result: %s, error: %s", t.Result, t.Error)
}
// blockTraceTask represents a single block trace task when an entire chain is
// being traced.
type blockTraceTask struct {
statedb *state.StateDB // Intermediate state prepped for tracing
block *types.Block // Block to trace the transactions from
rootref common.Hash // Trie root reference held for this task
results []*txTraceResult // Trace results procudes by the task
}
// blockTraceResult represets the results of tracing a single block when an entire
// chain is being traced.
type blockTraceResult struct {
Block hexutil.Uint64 `json:"block"` // Block number corresponding to this trace
Hash common.Hash `json:"hash"` // Block hash corresponding to this trace
Traces []*txTraceResult `json:"traces"` // Trace results produced by the task
}
// txTraceTask represents a single transaction trace task when an entire block
// is being traced.
type txTraceTask struct {
statedb *state.StateDB // Intermediate state prepped for tracing
index int // Transaction offset in the block
}
// TraceChain returns the structured logs created during the execution of EVM
// between two blocks (excluding start) and returns them as a JSON object.
func (api *API) TraceChain(ctx context.Context, start, end rpc.BlockNumber, config *TraceConfig) (*rpc.Subscription, error) { // Fetch the block interval that we want to trace
from, err := api.blockByNumber(ctx, start)
if err != nil {
return nil, err
}
to, err := api.blockByNumber(ctx, end)
if err != nil {
return nil, err
}
if from.Number().Cmp(to.Number()) >= 0 {
return nil, fmt.Errorf("end block (#%d) needs to come after start block (#%d)", end, start)
}
return api.traceChain(ctx, from, to, config)
}
// traceChain configures a new tracer according to the provided configuration, and
// executes all the transactions contained within. The return value will be one item
// per transaction, dependent on the requested tracer.
func (api *API) traceChain(ctx context.Context, start, end *types.Block, config *TraceConfig) (*rpc.Subscription, error) {
// Tracing a chain is a **long** operation, only do with subscriptions
notifier, supported := rpc.NotifierFromContext(ctx)
if !supported {
return &rpc.Subscription{}, rpc.ErrNotificationsUnsupported
}
sub := notifier.CreateSubscription()
// Prepare all the states for tracing. Note this procedure can take very
// long time. Timeout mechanism is necessary.
reexec := defaultTraceReexec
if config != nil && config.Reexec != nil {
reexec = *config.Reexec
}
blocks := int(end.NumberU64() - start.NumberU64())
threads := runtime.NumCPU()
if threads > blocks {
threads = blocks
}
var (
pend = new(sync.WaitGroup)
tasks = make(chan *blockTraceTask, threads)
results = make(chan *blockTraceTask, threads)
localctx = context.Background()
)
for th := 0; th < threads; th++ {
pend.Add(1)
go func() {
defer pend.Done()
// Fetch and execute the next block trace tasks
for task := range tasks {
signer := types.MakeSigner(api.backend.ChainConfig(), task.block.Number(), new(big.Int).SetUint64(task.block.Time()))
blockCtx := core.NewEVMBlockContext(task.block.Header(), api.chainContext(localctx), nil)
// Trace all the transactions contained within
for i, tx := range task.block.Transactions() {
msg, _ := tx.AsMessage(signer, task.block.BaseFee())
txctx := &Context{
BlockHash: task.block.Hash(),
TxIndex: i,
TxHash: tx.Hash(),
}
res, err := api.traceTx(localctx, msg, txctx, blockCtx, task.statedb, config)
if err != nil {
task.results[i] = &txTraceResult{Error: err.Error()}
log.Warn("Tracing failed", "hash", tx.Hash(), "block", task.block.NumberU64(), "err", err)
break
}
// Only delete empty objects if EIP158/161 (a.k.a Spurious Dragon) is in effect
task.statedb.Finalise(api.backend.ChainConfig().IsEIP158(task.block.Number()))
task.results[i] = &txTraceResult{Result: res}
}
// Stream the result back to the user or abort on teardown
select {
case results <- task:
case <-notifier.Closed():
return
}
}
}()
}
// Start a goroutine to feed all the blocks into the tracers
var (
begin = time.Now()
derefTodo []common.Hash // list of hashes to dereference from the db
derefsMu sync.Mutex // mutex for the derefs
)
go func() {
var (
logged time.Time
number uint64
traced uint64
failed error
parent common.Hash
statedb *state.StateDB
)
// Ensure everything is properly cleaned up on any exit path
defer func() {
close(tasks)
pend.Wait()
switch {
case failed != nil:
log.Warn("Chain tracing failed", "start", start.NumberU64(), "end", end.NumberU64(), "transactions", traced, "elapsed", time.Since(begin), "err", failed)
case number < end.NumberU64():
log.Warn("Chain tracing aborted", "start", start.NumberU64(), "end", end.NumberU64(), "abort", number, "transactions", traced, "elapsed", time.Since(begin))
default:
log.Info("Chain tracing finished", "start", start.NumberU64(), "end", end.NumberU64(), "transactions", traced, "elapsed", time.Since(begin))
}
close(results)
}()
var preferDisk bool
// Feed all the blocks both into the tracer, as well as fast process concurrently
for number = start.NumberU64(); number < end.NumberU64(); number++ {
// Stop tracing if interruption was requested
select {
case <-notifier.Closed():
return
default:
}
// clean out any derefs
derefsMu.Lock()
for _, h := range derefTodo {
statedb.Database().TrieDB().Dereference(h)
}
derefTodo = derefTodo[:0]
derefsMu.Unlock()
// Print progress logs if long enough time elapsed
if time.Since(logged) > 8*time.Second {
logged = time.Now()
log.Info("Tracing chain segment", "start", start.NumberU64(), "end", end.NumberU64(), "current", number, "transactions", traced, "elapsed", time.Since(begin))
}
// Retrieve the parent state to trace on top
block, err := api.blockByNumber(localctx, rpc.BlockNumber(number))
if err != nil {
failed = err
break
}
// Prepare the statedb for tracing. Don't use the live database for
// tracing to avoid persisting state junks into the database.
statedb, err = api.backend.StateAtBlock(localctx, block, reexec, statedb, false, preferDisk)
if err != nil {
failed = err
break
}
if trieDb := statedb.Database().TrieDB(); trieDb != nil {
// Hold the reference for tracer, will be released at the final stage
trieDb.Reference(block.Root(), common.Hash{})
// Release the parent state because it's already held by the tracer
if parent != (common.Hash{}) {
trieDb.Dereference(parent)
}
// Prefer disk if the trie db memory grows too much
s1, s2 := trieDb.Size()
if !preferDisk && (s1+s2) > defaultTracechainMemLimit {
log.Info("Switching to prefer-disk mode for tracing", "size", s1+s2)
preferDisk = true
}
}
parent = block.Root()
next, err := api.blockByNumber(localctx, rpc.BlockNumber(number+1))
if err != nil {
failed = err
break
}
// Send the block over to the concurrent tracers (if not in the fast-forward phase)
txs := next.Transactions()
select {
case tasks <- &blockTraceTask{statedb: statedb.Copy(), block: next, rootref: block.Root(), results: make([]*txTraceResult, len(txs))}:
case <-notifier.Closed():
return
}
traced += uint64(len(txs))
}
}()
// Keep reading the trace results and stream the to the user
go func() {
var (
done = make(map[uint64]*blockTraceResult)
next = start.NumberU64() + 1
)
for res := range results {
// Queue up next received result
result := &blockTraceResult{
Block: hexutil.Uint64(res.block.NumberU64()),
Hash: res.block.Hash(),
Traces: res.results,
}
// Schedule any parent tries held in memory by this task for dereferencing
done[uint64(result.Block)] = result
derefsMu.Lock()
derefTodo = append(derefTodo, res.rootref)
derefsMu.Unlock()
// Stream completed traces to the user, aborting on the first error
for result, ok := done[next]; ok; result, ok = done[next] {
if len(result.Traces) > 0 || next == end.NumberU64() {
notifier.Notify(sub.ID, result)
}
delete(done, next)
next++
}
}
}()
return sub, nil
}
// TraceBlockByNumber returns the structured logs created during the execution of
// EVM and returns them as a JSON object.
func (api *API) TraceBlockByNumber(ctx context.Context, number rpc.BlockNumber, config *TraceConfig) ([]*txTraceResult, error) {
block, err := api.blockByNumber(ctx, number)
if err != nil {
return nil, err
}
return api.traceBlock(ctx, block, config)
}
// TraceBlockByHash returns the structured logs created during the execution of
// EVM and returns them as a JSON object.
func (api *API) TraceBlockByHash(ctx context.Context, hash common.Hash, config *TraceConfig) ([]*txTraceResult, error) {
block, err := api.blockByHash(ctx, hash)
if err != nil {
return nil, err
}
return api.traceBlock(ctx, block, config)
}
// TraceBlock returns the structured logs created during the execution of EVM
// and returns them as a JSON object.
func (api *API) TraceBlock(ctx context.Context, blob hexutil.Bytes, config *TraceConfig) ([]*txTraceResult, error) {
block := new(types.Block)
if err := rlp.Decode(bytes.NewReader(blob), block); err != nil {
return nil, fmt.Errorf("could not decode block: %v", err)
}
return api.traceBlock(ctx, block, config)
}
// TraceBadBlock returns the structured logs created during the execution of
// EVM against a block pulled from the pool of bad ones and returns them as a JSON
// object.
func (api *API) TraceBadBlock(ctx context.Context, hash common.Hash, config *TraceConfig) ([]*txTraceResult, error) {
// Search for the bad block corresponding to [hash].
var (
badBlocks, _ = api.backend.BadBlocks()
block *types.Block
)
for _, badBlock := range badBlocks {
if hash == block.Hash() {
block = badBlock
break
}
}
if block == nil {
return nil, fmt.Errorf("bad block %#x not found", hash)
}
return api.traceBlock(ctx, block, config)
}
// IntermediateRoots executes a block (bad- or canon- or side-), and returns a list
// of intermediate roots: the stateroot after each transaction.
func (api *API) IntermediateRoots(ctx context.Context, hash common.Hash, config *TraceConfig) ([]common.Hash, error) {
block, _ := api.blockByHash(ctx, hash)
if block == nil {
return nil, fmt.Errorf("block %#x not found", hash)
}
if block.NumberU64() == 0 {
return nil, errors.New("genesis is not traceable")
}
parent, err := api.blockByNumberAndHash(ctx, rpc.BlockNumber(block.NumberU64()-1), block.ParentHash())
if err != nil {
return nil, err
}
reexec := defaultTraceReexec
if config != nil && config.Reexec != nil {
reexec = *config.Reexec
}
statedb, err := api.backend.StateAtBlock(ctx, parent, reexec, nil, true, false)
if err != nil {
return nil, err
}
var (
roots []common.Hash
signer = types.MakeSigner(api.backend.ChainConfig(), block.Number(), new(big.Int).SetUint64(block.Time()))
chainConfig = api.backend.ChainConfig()
vmctx = core.NewEVMBlockContext(block.Header(), api.chainContext(ctx), nil)
deleteEmptyObjects = chainConfig.IsEIP158(block.Number())
)
for i, tx := range block.Transactions() {
var (
msg, _ = tx.AsMessage(signer, block.BaseFee())
txContext = core.NewEVMTxContext(msg)
vmenv = vm.NewEVM(vmctx, txContext, statedb, chainConfig, vm.Config{})
)
statedb.Prepare(tx.Hash(), i)
if _, err := core.ApplyMessage(vmenv, msg, new(core.GasPool).AddGas(msg.Gas())); err != nil {
log.Warn("Tracing intermediate roots did not complete", "txindex", i, "txhash", tx.Hash(), "err", err)
// We intentionally don't return the error here: if we do, then the RPC server will not
// return the roots. Most likely, the caller already knows that a certain transaction fails to
// be included, but still want the intermediate roots that led to that point.
// It may happen the tx_N causes an erroneous state, which in turn causes tx_N+M to not be
// executable.
// N.B: This should never happen while tracing canon blocks, only when tracing bad blocks.
return roots, nil
}
// calling IntermediateRoot will internally call Finalize on the state
// so any modifications are written to the trie
roots = append(roots, statedb.IntermediateRoot(deleteEmptyObjects))
}
return roots, nil
}
// traceBlock configures a new tracer according to the provided configuration, and
// executes all the transactions contained within. The return value will be one item
// per transaction, dependent on the requested tracer.
func (api *API) traceBlock(ctx context.Context, block *types.Block, config *TraceConfig) ([]*txTraceResult, error) {
if block.NumberU64() == 0 {
return nil, errors.New("genesis is not traceable")
}
parent, err := api.blockByNumberAndHash(ctx, rpc.BlockNumber(block.NumberU64()-1), block.ParentHash())
if err != nil {
return nil, err
}
reexec := defaultTraceReexec
if config != nil && config.Reexec != nil {
reexec = *config.Reexec
}
statedb, err := api.backend.StateAtBlock(ctx, parent, reexec, nil, true, false)
if err != nil {
return nil, err
}
// Execute all the transaction contained within the block concurrently
var (
signer = types.MakeSigner(api.backend.ChainConfig(), block.Number(), new(big.Int).SetUint64(block.Time()))
txs = block.Transactions()
results = make([]*txTraceResult, len(txs))
pend = new(sync.WaitGroup)
jobs = make(chan *txTraceTask, len(txs))
)
threads := runtime.NumCPU()
if threads > len(txs) {
threads = len(txs)
}
blockHash := block.Hash()
for th := 0; th < threads; th++ {
pend.Add(1)
go func() {
defer pend.Done()
blockCtx := core.NewEVMBlockContext(block.Header(), api.chainContext(ctx), nil)
// Fetch and execute the next transaction trace tasks
for task := range jobs {
msg, _ := txs[task.index].AsMessage(signer, block.BaseFee())
txctx := &Context{
BlockHash: blockHash,
TxIndex: task.index,
TxHash: txs[task.index].Hash(),
}
res, err := api.traceTx(ctx, msg, txctx, blockCtx, task.statedb, config)
if err != nil {
results[task.index] = &txTraceResult{Error: err.Error()}
continue
}
results[task.index] = &txTraceResult{Result: res}
}
}()
}
// Feed the transactions into the tracers and return
var failed error
blockCtx := core.NewEVMBlockContext(block.Header(), api.chainContext(ctx), nil)
for i, tx := range txs {
// Send the trace task over for execution
jobs <- &txTraceTask{statedb: statedb.Copy(), index: i}
// Generate the next state snapshot fast without tracing
msg, _ := tx.AsMessage(signer, block.BaseFee())
statedb.Prepare(tx.Hash(), i)
vmenv := vm.NewEVM(blockCtx, core.NewEVMTxContext(msg), statedb, api.backend.ChainConfig(), vm.Config{})
if _, err := core.ApplyMessage(vmenv, msg, new(core.GasPool).AddGas(msg.Gas())); err != nil {
failed = err
break
}
// Finalize the state so any modifications are written to the trie
// Only delete empty objects if EIP158/161 (a.k.a Spurious Dragon) is in effect
statedb.Finalise(vmenv.ChainConfig().IsEIP158(block.Number()))
}
close(jobs)
pend.Wait()
// If execution failed in between, abort
if failed != nil {
return nil, failed
}
return results, nil
}
// TraceTransaction returns the structured logs created during the execution of EVM
// and returns them as a JSON object.
func (api *API) TraceTransaction(ctx context.Context, hash common.Hash, config *TraceConfig) (interface{}, error) {
_, blockHash, blockNumber, index, err := api.backend.GetTransaction(ctx, hash)
if err != nil {
return nil, err
}
// It shouldn't happen in practice.
if blockNumber == 0 {
return nil, errors.New("genesis is not traceable")
}
reexec := defaultTraceReexec
if config != nil && config.Reexec != nil {
reexec = *config.Reexec
}
block, err := api.blockByNumberAndHash(ctx, rpc.BlockNumber(blockNumber), blockHash)
if err != nil {
return nil, err
}
msg, vmctx, statedb, err := api.backend.StateAtTransaction(ctx, block, int(index), reexec)
if err != nil {
return nil, err
}
txctx := &Context{
BlockHash: blockHash,
TxIndex: int(index),
TxHash: hash,
}
return api.traceTx(ctx, msg, txctx, vmctx, statedb, config)
}
// TraceCall lets you trace a given eth_call. It collects the structured logs
// created during the execution of EVM if the given transaction was added on
// top of the provided block and returns them as a JSON object.
func (api *API) TraceCall(ctx context.Context, args ethapi.TransactionArgs, blockNrOrHash rpc.BlockNumberOrHash, config *TraceCallConfig) (interface{}, error) {
// Try to retrieve the specified block
var (
err error
block *types.Block
)
if hash, ok := blockNrOrHash.Hash(); ok {
block, err = api.blockByHash(ctx, hash)
} else if number, ok := blockNrOrHash.Number(); ok {
if number == rpc.PendingBlockNumber {
// We don't have access to the miner here. For tracing 'future' transactions,
// it can be done with block- and state-overrides instead, which offers
// more flexibility and stability than trying to trace on 'pending', since
// the contents of 'pending' is unstable and probably not a true representation
// of what the next actual block is likely to contain.
return nil, errors.New("tracing on top of pending is not supported")
}
block, err = api.blockByNumber(ctx, number)
} else {
return nil, errors.New("invalid arguments; neither block nor hash specified")
}
if err != nil {
return nil, err
}
// try to recompute the state
reexec := defaultTraceReexec
if config != nil && config.Reexec != nil {
reexec = *config.Reexec
}
statedb, err := api.backend.StateAtBlock(ctx, block, reexec, nil, true, false)
if err != nil {
return nil, err
}
vmctx := core.NewEVMBlockContext(block.Header(), api.chainContext(ctx), nil)
// Apply the customization rules if required.
if config != nil {
if err := config.StateOverrides.Apply(statedb); err != nil {
return nil, err
}
config.BlockOverrides.Apply(&vmctx)
}
// Execute the trace
msg, err := args.ToMessage(api.backend.RPCGasCap(), block.BaseFee())
if err != nil {
return nil, err
}
var traceConfig *TraceConfig
if config != nil {
traceConfig = &TraceConfig{
Config: config.Config,
Tracer: config.Tracer,
Timeout: config.Timeout,
Reexec: config.Reexec,
}
}
return api.traceTx(ctx, msg, new(Context), vmctx, statedb, traceConfig)
}
// traceTx configures a new tracer according to the provided configuration, and
// executes the given message in the provided environment. The return value will
// be tracer dependent.
func (api *API) traceTx(ctx context.Context, message core.Message, txctx *Context, vmctx vm.BlockContext, statedb *state.StateDB, config *TraceConfig) (interface{}, error) {
var (
tracer Tracer
err error
timeout = defaultTraceTimeout
txContext = core.NewEVMTxContext(message)
)
if config == nil {
config = &TraceConfig{}
}
// Default tracer is the struct logger
tracer = logger.NewStructLogger(config.Config)
if config.Tracer != nil {
tracer, err = New(*config.Tracer, txctx, config.TracerConfig)
if err != nil {
return nil, err
}
}
// Define a meaningful timeout of a single transaction trace
if config.Timeout != nil {
if timeout, err = time.ParseDuration(*config.Timeout); err != nil {
return nil, err
}
}
deadlineCtx, cancel := context.WithTimeout(ctx, timeout)
go func() {
<-deadlineCtx.Done()
if errors.Is(deadlineCtx.Err(), context.DeadlineExceeded) {
tracer.Stop(errors.New("execution timeout"))
}
}()
defer cancel()
// Run the transaction with tracing enabled.
vmenv := vm.NewEVM(vmctx, txContext, statedb, api.backend.ChainConfig(), vm.Config{Debug: true, Tracer: tracer, NoBaseFee: true})
// Call Prepare to clear out the statedb access list
statedb.Prepare(txctx.TxHash, txctx.TxIndex)
if _, err = core.ApplyMessage(vmenv, message, new(core.GasPool).AddGas(message.Gas())); err != nil {
return nil, fmt.Errorf("tracing failed: %w", err)
}
return tracer.GetResult()
}
// APIs return the collection of RPC services the tracer package offers.
func APIs(backend Backend) []rpc.API {
// Append all the local APIs and return
return []rpc.API{
{
Namespace: "debug",
Service: NewAPI(backend),
Name: "debug-tracer",
},
}
}