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Merge pull request #23104 from karalabe/tracer-context

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eth/tracers: expose contextual infos (block hash, tx hash, tx index)
This commit is contained in:
Péter Szilágyi 2021-06-24 13:50:07 +03:00 committed by GitHub
commit 9e23610b0f
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GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 49 additions and 41 deletions
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39
eth/tracers/api.go
View File

@ -178,13 +178,6 @@ type StdTraceConfig struct {
TxHash common.Hash
}
// txTraceContext is the contextual infos about a transaction before it gets run.
type txTraceContext struct {
index int // Index of the transaction within the block
hash common.Hash // Hash of the transaction
block common.Hash // Hash of the block containing the transaction
}
// txTraceResult is the result of a single transaction trace.
type txTraceResult struct {
Result interface{} `json:"result,omitempty"` // Trace results produced by the tracer
@ -272,10 +265,10 @@ func (api *API) traceChain(ctx context.Context, start, end *types.Block, config
// Trace all the transactions contained within
for i, tx := range task.block.Transactions() {
msg, _ := tx.AsMessage(signer, task.block.BaseFee())
txctx := &txTraceContext{
index: i,
hash: tx.Hash(),
block: task.block.Hash(),
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 {
@ -524,10 +517,10 @@ func (api *API) traceBlock(ctx context.Context, block *types.Block, config *Trac
// Fetch and execute the next transaction trace tasks
for task := range jobs {
msg, _ := txs[task.index].AsMessage(signer, block.BaseFee())
txctx := &txTraceContext{
index: task.index,
hash: txs[task.index].Hash(),
block: blockHash,
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 {
@ -718,10 +711,10 @@ func (api *API) TraceTransaction(ctx context.Context, hash common.Hash, config *
if err != nil {
return nil, err
}
txctx := &txTraceContext{
index: int(index),
hash: hash,
block: blockHash,
txctx := &Context{
BlockHash: blockHash,
TxIndex: int(index),
TxHash: hash,
}
return api.traceTx(ctx, msg, txctx, vmctx, statedb, config)
}
@ -777,13 +770,13 @@ func (api *API) TraceCall(ctx context.Context, args ethapi.TransactionArgs, bloc
Reexec: config.Reexec,
}
}
return api.traceTx(ctx, msg, new(txTraceContext), vmctx, statedb, traceConfig)
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 *txTraceContext, vmctx vm.BlockContext, statedb *state.StateDB, config *TraceConfig) (interface{}, error) {
func (api *API) traceTx(ctx context.Context, message core.Message, txctx *Context, vmctx vm.BlockContext, statedb *state.StateDB, config *TraceConfig) (interface{}, error) {
// Assemble the structured logger or the JavaScript tracer
var (
tracer vm.Tracer
@ -800,7 +793,7 @@ func (api *API) traceTx(ctx context.Context, message core.Message, txctx *txTrac
}
}
// Constuct the JavaScript tracer to execute with
if tracer, err = New(*config.Tracer, txContext); err != nil {
if tracer, err = New(*config.Tracer, txctx); err != nil {
return nil, err
}
// Handle timeouts and RPC cancellations
@ -823,7 +816,7 @@ func (api *API) traceTx(ctx context.Context, message core.Message, txctx *txTrac
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.hash, txctx.block, txctx.index)
statedb.Prepare(txctx.TxHash, txctx.BlockHash, txctx.TxIndex)
result, err := core.ApplyMessage(vmenv, message, new(core.GasPool).AddGas(message.Gas()))
if err != nil {

20
eth/tracers/tracer.go
View File

@ -312,10 +312,18 @@ type Tracer struct {
reason error // Textual reason for the interruption
}
// Context contains some contextual infos for a transaction execution that is not
// available from within the EVM object.
type Context struct {
BlockHash common.Hash // Hash of the block the tx is contained within (zero if dangling tx or call)
TxIndex int // Index of the transaction within a block (zero if dangling tx or call)
TxHash common.Hash // Hash of the transaction being traced (zero if dangling call)
}
// New instantiates a new tracer instance. code specifies a Javascript snippet,
// which must evaluate to an expression returning an object with 'step', 'fault'
// and 'result' functions.
func New(code string, txCtx vm.TxContext) (*Tracer, error) {
func New(code string, ctx *Context) (*Tracer, error) {
// Resolve any tracers by name and assemble the tracer object
if tracer, ok := tracer(code); ok {
code = tracer
@ -334,8 +342,14 @@ func New(code string, txCtx vm.TxContext) (*Tracer, error) {
depthValue: new(uint),
refundValue: new(uint),
}
tracer.ctx["gasPrice"] = txCtx.GasPrice
if ctx.BlockHash != (common.Hash{}) {
tracer.ctx["blockHash"] = ctx.BlockHash
if ctx.TxHash != (common.Hash{}) {
tracer.ctx["txIndex"] = ctx.TxIndex
tracer.ctx["txHash"] = ctx.TxHash
}
}
// Set up builtins for this environment
tracer.vm.PushGlobalGoFunction("toHex", func(ctx *duktape.Context) int {
ctx.PushString(hexutil.Encode(popSlice(ctx)))
@ -550,11 +564,13 @@ func (jst *Tracer) CaptureStart(env *vm.EVM, from common.Address, to common.Addr
jst.ctx["to"] = to
jst.ctx["input"] = input
jst.ctx["gas"] = gas
jst.ctx["gasPrice"] = env.TxContext.GasPrice
jst.ctx["value"] = value
// Initialize the context
jst.ctx["block"] = env.Context.BlockNumber.Uint64()
jst.dbWrapper.db = env.StateDB
// Compute intrinsic gas
isHomestead := env.ChainConfig().IsHomestead(env.Context.BlockNumber)
isIstanbul := env.ChainConfig().IsIstanbul(env.Context.BlockNumber)

27
eth/tracers/tracer_test.go
View File

@ -80,12 +80,14 @@ func runTrace(tracer *Tracer, vmctx *vmContext) (json.RawMessage, error) {
func TestTracer(t *testing.T) {
execTracer := func(code string) ([]byte, string) {
t.Helper()
ctx := &vmContext{blockCtx: vm.BlockContext{BlockNumber: big.NewInt(1)}, txCtx: vm.TxContext{GasPrice: big.NewInt(100000)}}
tracer, err := New(code, ctx.txCtx)
tracer, err := New(code, new(Context))
if err != nil {
t.Fatal(err)
}
ret, err := runTrace(tracer, ctx)
ret, err := runTrace(tracer, &vmContext{
blockCtx: vm.BlockContext{BlockNumber: big.NewInt(1)},
txCtx: vm.TxContext{GasPrice: big.NewInt(100000)},
})
if err != nil {
return nil, err.Error() // Stringify to allow comparison without nil checks
}
@ -132,25 +134,21 @@ func TestHalt(t *testing.T) {
t.Skip("duktape doesn't support abortion")
timeout := errors.New("stahp")
vmctx := testCtx()
tracer, err := New("{step: function() { while(1); }, result: function() { return null; }}", vmctx.txCtx)
tracer, err := New("{step: function() { while(1); }, result: function() { return null; }}", new(Context))
if err != nil {
t.Fatal(err)
}
go func() {
time.Sleep(1 * time.Second)
tracer.Stop(timeout)
}()
if _, err = runTrace(tracer, vmctx); err.Error() != "stahp in server-side tracer function 'step'" {
if _, err = runTrace(tracer, testCtx()); err.Error() != "stahp in server-side tracer function 'step'" {
t.Errorf("Expected timeout error, got %v", err)
}
}
func TestHaltBetweenSteps(t *testing.T) {
vmctx := testCtx()
tracer, err := New("{step: function() {}, fault: function() {}, result: function() { return null; }}", vmctx.txCtx)
tracer, err := New("{step: function() {}, fault: function() {}, result: function() { return null; }}", new(Context))
if err != nil {
t.Fatal(err)
}
@ -158,7 +156,6 @@ func TestHaltBetweenSteps(t *testing.T) {
scope := &vm.ScopeContext{
Contract: vm.NewContract(&account{}, &account{}, big.NewInt(0), 0),
}
tracer.CaptureState(env, 0, 0, 0, 0, scope, nil, 0, nil)
timeout := errors.New("stahp")
tracer.Stop(timeout)
@ -182,12 +179,14 @@ func TestNoStepExec(t *testing.T) {
}
execTracer := func(code string) []byte {
t.Helper()
ctx := &vmContext{blockCtx: vm.BlockContext{BlockNumber: big.NewInt(1)}, txCtx: vm.TxContext{GasPrice: big.NewInt(100000)}}
tracer, err := New(code, ctx.txCtx)
tracer, err := New(code, new(Context))
if err != nil {
t.Fatal(err)
}
ret, err := runEmptyTrace(tracer, ctx)
ret, err := runEmptyTrace(tracer, &vmContext{
blockCtx: vm.BlockContext{BlockNumber: big.NewInt(1)},
txCtx: vm.TxContext{GasPrice: big.NewInt(100000)},
})
if err != nil {
t.Fatal(err)
}

4
eth/tracers/tracers_test.go
View File

@ -173,7 +173,7 @@ func TestPrestateTracerCreate2(t *testing.T) {
_, statedb := tests.MakePreState(rawdb.NewMemoryDatabase(), alloc, false)
// Create the tracer, the EVM environment and run it
tracer, err := New("prestateTracer", txContext)
tracer, err := New("prestateTracer", new(Context))
if err != nil {
t.Fatalf("failed to create call tracer: %v", err)
}
@ -248,7 +248,7 @@ func TestCallTracer(t *testing.T) {
_, statedb := tests.MakePreState(rawdb.NewMemoryDatabase(), test.Genesis.Alloc, false)
// Create the tracer, the EVM environment and run it
tracer, err := New("callTracer", txContext)
tracer, err := New("callTracer", new(Context))
if err != nil {
t.Fatalf("failed to create call tracer: %v", err)
}