eth/tracers, core/vm: remove `time` from trace output and tracing interface (#26291)

This removes the 'time' field from logs, as well as from the tracer interface. This change makes the trace output deterministic.  If a tracer needs the time they can measure it themselves. No need for evm to do this.

Co-authored-by: Sina Mahmoodi <itz.s1na@gmail.com>

core/vm/evm.go

@@ -19,7 +19,6 @@ package vm
 import (
 	"math/big"
 	"sync/atomic"
-	"time"
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/crypto"
@@ -183,7 +182,7 @@ func (evm *EVM) Call(caller ContractRef, addr common.Address, input []byte, gas
 			if evm.Config.Debug {
 				if evm.depth == 0 {
 					evm.Config.Tracer.CaptureStart(evm, caller.Address(), addr, false, input, gas, value)
-					evm.Config.Tracer.CaptureEnd(ret, 0, 0, nil)
+					evm.Config.Tracer.CaptureEnd(ret, 0, nil)
 				} else {
 					evm.Config.Tracer.CaptureEnter(CALL, caller.Address(), addr, input, gas, value)
 					evm.Config.Tracer.CaptureExit(ret, 0, nil)
@@ -199,9 +198,9 @@ func (evm *EVM) Call(caller ContractRef, addr common.Address, input []byte, gas
 	if evm.Config.Debug {
 		if evm.depth == 0 {
 			evm.Config.Tracer.CaptureStart(evm, caller.Address(), addr, false, input, gas, value)
-			defer func(startGas uint64, startTime time.Time) { // Lazy evaluation of the parameters
-				evm.Config.Tracer.CaptureEnd(ret, startGas-gas, time.Since(startTime), err)
-			}(gas, time.Now())
+			defer func(startGas uint64) { // Lazy evaluation of the parameters
+				evm.Config.Tracer.CaptureEnd(ret, startGas-gas, err)
+			}(gas)
 		} else {
 			// Handle tracer events for entering and exiting a call frame
 			evm.Config.Tracer.CaptureEnter(CALL, caller.Address(), addr, input, gas, value)
@@ -448,8 +447,6 @@ func (evm *EVM) create(caller ContractRef, codeAndHash *codeAndHash, gas uint64,
 		}
 	}
 
-	start := time.Now()
-
 	ret, err := evm.interpreter.Run(contract, nil, false)
 
 	// Check whether the max code size has been exceeded, assign err if the case.
@@ -487,7 +484,7 @@ func (evm *EVM) create(caller ContractRef, codeAndHash *codeAndHash, gas uint64,
 
 	if evm.Config.Debug {
 		if evm.depth == 0 {
-			evm.Config.Tracer.CaptureEnd(ret, gas-contract.Gas, time.Since(start), err)
+			evm.Config.Tracer.CaptureEnd(ret, gas-contract.Gas, err)
 		} else {
 			evm.Config.Tracer.CaptureExit(ret, gas-contract.Gas, err)
 		}

core/vm/logger.go

@@ -18,7 +18,6 @@ package vm
 
 import (
 	"math/big"
-	"time"
 
 	"github.com/ethereum/go-ethereum/common"
 )
@@ -34,7 +33,7 @@ type EVMLogger interface {
 	CaptureTxEnd(restGas uint64)
 	// Top call frame
 	CaptureStart(env *EVM, from common.Address, to common.Address, create bool, input []byte, gas uint64, value *big.Int)
-	CaptureEnd(output []byte, gasUsed uint64, t time.Duration, err error)
+	CaptureEnd(output []byte, gasUsed uint64, err error)
 	// Rest of call frames
 	CaptureEnter(typ OpCode, from common.Address, to common.Address, input []byte, gas uint64, value *big.Int)
 	CaptureExit(output []byte, gasUsed uint64, err error)

eth/tracers/js/goja.go

@@ -21,7 +21,6 @@ import (
 	"errors"
 	"fmt"
 	"math/big"
-	"time"
 
 	"github.com/dop251/goja"
 
@@ -285,9 +284,8 @@ func (t *jsTracer) CaptureFault(pc uint64, op vm.OpCode, gas, cost uint64, scope
 }
 
 // CaptureEnd is called after the call finishes to finalize the tracing.
-func (t *jsTracer) CaptureEnd(output []byte, gasUsed uint64, duration time.Duration, err error) {
+func (t *jsTracer) CaptureEnd(output []byte, gasUsed uint64, err error) {
 	t.ctx["output"] = t.vm.ToValue(output)
-	t.ctx["time"] = t.vm.ToValue(duration.String())
 	if err != nil {
 		t.ctx["error"] = t.vm.ToValue(err.Error())
 	}

eth/tracers/js/internal/tracers/call_tracer_legacy.js

@@ -233,7 +233,6 @@
 			input:   call.input,
 			output:  call.output,
 			error:   call.error,
-			time:    call.time,
 			calls:   call.calls,
 		}
 		for (var key in sorted) {

eth/tracers/js/tracer_test.go

@@ -76,7 +76,7 @@ func runTrace(tracer tracers.Tracer, vmctx *vmContext, chaincfg *params.ChainCon
 	tracer.CaptureTxStart(gasLimit)
 	tracer.CaptureStart(env, contract.Caller(), contract.Address(), false, []byte{}, startGas, value)
 	ret, err := env.Interpreter().Run(contract, []byte{}, false)
-	tracer.CaptureEnd(ret, startGas-contract.Gas, 1, err)
+	tracer.CaptureEnd(ret, startGas-contract.Gas, err)
 	// Rest gas assumes no refund
 	tracer.CaptureTxEnd(contract.Gas)
 	if err != nil {
@@ -206,7 +206,7 @@ func TestNoStepExec(t *testing.T) {
 		}
 		env := vm.NewEVM(vm.BlockContext{BlockNumber: big.NewInt(1)}, vm.TxContext{GasPrice: big.NewInt(100)}, &dummyStatedb{}, params.TestChainConfig, vm.Config{Debug: true, Tracer: tracer})
 		tracer.CaptureStart(env, common.Address{}, common.Address{}, false, []byte{}, 1000, big.NewInt(0))
-		tracer.CaptureEnd(nil, 0, 1, nil)
+		tracer.CaptureEnd(nil, 0, nil)
 		ret, err := tracer.GetResult()
 		if err != nil {
 			t.Fatal(err)

eth/tracers/logger/access_list_tracer.go

@@ -18,7 +18,6 @@ package logger
 
 import (
 	"math/big"
-	"time"
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/types"
@@ -162,7 +161,7 @@ func (a *AccessListTracer) CaptureState(pc uint64, op vm.OpCode, gas, cost uint6
 func (*AccessListTracer) CaptureFault(pc uint64, op vm.OpCode, gas, cost uint64, scope *vm.ScopeContext, depth int, err error) {
 }
 
-func (*AccessListTracer) CaptureEnd(output []byte, gasUsed uint64, t time.Duration, err error) {}
+func (*AccessListTracer) CaptureEnd(output []byte, gasUsed uint64, err error) {}
 
 func (*AccessListTracer) CaptureEnter(typ vm.OpCode, from common.Address, to common.Address, input []byte, gas uint64, value *big.Int) {
 }

eth/tracers/logger/logger.go

@@ -24,7 +24,6 @@ import (
 	"math/big"
 	"strings"
 	"sync/atomic"
-	"time"
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/common/hexutil"
@@ -219,7 +218,7 @@ func (l *StructLogger) CaptureFault(pc uint64, op vm.OpCode, gas, cost uint64, s
 }
 
 // CaptureEnd is called after the call finishes to finalize the tracing.
-func (l *StructLogger) CaptureEnd(output []byte, gasUsed uint64, t time.Duration, err error) {
+func (l *StructLogger) CaptureEnd(output []byte, gasUsed uint64, err error) {
 	l.output = output
 	l.err = err
 	if l.cfg.Debug {
@@ -385,7 +384,7 @@ func (t *mdLogger) CaptureFault(pc uint64, op vm.OpCode, gas, cost uint64, scope
 	fmt.Fprintf(t.out, "\nError: at pc=%d, op=%v: %v\n", pc, op, err)
 }
 
-func (t *mdLogger) CaptureEnd(output []byte, gasUsed uint64, tm time.Duration, err error) {
+func (t *mdLogger) CaptureEnd(output []byte, gasUsed uint64, err error) {
 	fmt.Fprintf(t.out, "\nOutput: `%#x`\nConsumed gas: `%d`\nError: `%v`\n",
 		output, gasUsed, err)
 }

eth/tracers/logger/logger_json.go

@@ -20,7 +20,6 @@ import (
 	"encoding/json"
 	"io"
 	"math/big"
-	"time"
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/common/math"
@@ -80,18 +79,17 @@ func (l *JSONLogger) CaptureState(pc uint64, op vm.OpCode, gas, cost uint64, sco
 }
 
 // CaptureEnd is triggered at end of execution.
-func (l *JSONLogger) CaptureEnd(output []byte, gasUsed uint64, t time.Duration, err error) {
+func (l *JSONLogger) CaptureEnd(output []byte, gasUsed uint64, err error) {
 	type endLog struct {
 		Output  string              `json:"output"`
 		GasUsed math.HexOrDecimal64 `json:"gasUsed"`
-		Time    time.Duration       `json:"time"`
 		Err     string              `json:"error,omitempty"`
 	}
 	var errMsg string
 	if err != nil {
 		errMsg = err.Error()
 	}
-	l.encoder.Encode(endLog{common.Bytes2Hex(output), math.HexOrDecimal64(gasUsed), t, errMsg})
+	l.encoder.Encode(endLog{common.Bytes2Hex(output), math.HexOrDecimal64(gasUsed), errMsg})
 }
 
 func (l *JSONLogger) CaptureEnter(typ vm.OpCode, from common.Address, to common.Address, input []byte, gas uint64, value *big.Int) {

eth/tracers/native/call.go

@@ -21,7 +21,6 @@ import (
 	"errors"
 	"math/big"
 	"sync/atomic"
-	"time"
 
 	"github.com/ethereum/go-ethereum/accounts/abi"
 	"github.com/ethereum/go-ethereum/common"
@@ -142,7 +141,7 @@ func (t *callTracer) CaptureStart(env *vm.EVM, from common.Address, to common.Ad
 }
 
 // CaptureEnd is called after the call finishes to finalize the tracing.
-func (t *callTracer) CaptureEnd(output []byte, gasUsed uint64, _ time.Duration, err error) {
+func (t *callTracer) CaptureEnd(output []byte, gasUsed uint64, err error) {
 	t.callstack[0].processOutput(output, err)
 }
 

eth/tracers/native/mux.go

@@ -19,7 +19,6 @@ package native
 import (
 	"encoding/json"
 	"math/big"
-	"time"
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/vm"
@@ -67,9 +66,9 @@ func (t *muxTracer) CaptureStart(env *vm.EVM, from common.Address, to common.Add
 }
 
 // CaptureEnd is called after the call finishes to finalize the tracing.
-func (t *muxTracer) CaptureEnd(output []byte, gasUsed uint64, elapsed time.Duration, err error) {
+func (t *muxTracer) CaptureEnd(output []byte, gasUsed uint64, err error) {
 	for _, t := range t.tracers {
-		t.CaptureEnd(output, gasUsed, elapsed, err)
+		t.CaptureEnd(output, gasUsed, err)
 	}
 }
 

eth/tracers/native/noop.go

@@ -19,7 +19,6 @@ package native
 import (
 	"encoding/json"
 	"math/big"
-	"time"
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/vm"
@@ -44,7 +43,7 @@ func (t *noopTracer) CaptureStart(env *vm.EVM, from common.Address, to common.Ad
 }
 
 // CaptureEnd is called after the call finishes to finalize the tracing.
-func (t *noopTracer) CaptureEnd(output []byte, gasUsed uint64, _ time.Duration, err error) {
+func (t *noopTracer) CaptureEnd(output []byte, gasUsed uint64, err error) {
 }
 
 // CaptureState implements the EVMLogger interface to trace a single step of VM execution.

eth/tracers/native/prestate.go

@@ -21,7 +21,6 @@ import (
 	"encoding/json"
 	"math/big"
 	"sync/atomic"
-	"time"
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/common/hexutil"
@@ -118,7 +117,7 @@ func (t *prestateTracer) CaptureStart(env *vm.EVM, from common.Address, to commo
 }
 
 // CaptureEnd is called after the call finishes to finalize the tracing.
-func (t *prestateTracer) CaptureEnd(output []byte, gasUsed uint64, _ time.Duration, err error) {
+func (t *prestateTracer) CaptureEnd(output []byte, gasUsed uint64, err error) {
 	if t.config.DiffMode {
 		return
 	}