opt: improve trace handling logic to decrease GC pressure. (#92)

* Upgrade trace code to decrease GC pressure.

* Fix golangci bug

* Add goproxy

* update docker file

* trigger ci

* trigger ci

* Upgrade code

* Upgrade code

* trigger ci

Co-authored-by: HAOYUatHZ <37070449+HAOYUatHZ@users.noreply.github.com>

core/types/l2trace.go

@@ -38,9 +38,9 @@ type StructLogRes struct {
 	GasCost       uint64            `json:"gasCost"`
 	Depth         int               `json:"depth"`
 	Error         string            `json:"error,omitempty"`
-	Stack         *[]string          `json:"stack,omitempty"`
+	Stack         []string          `json:"stack,omitempty"`
-	Memory        *[]string          `json:"memory,omitempty"`
+	Memory        []string          `json:"memory,omitempty"`
-	Storage       *map[string]string `json:"storage,omitempty"`
+	Storage       map[string]string `json:"storage,omitempty"`
 	RefundCounter uint64            `json:"refund,omitempty"`
 	ExtraData     *ExtraData        `json:"extraData,omitempty"`
 }

core/vm/logger.go

@@ -441,11 +441,29 @@ func (t *mdLogger) CaptureEnter(typ OpCode, from common.Address, to common.Addre
 
 func (t *mdLogger) CaptureExit(output []byte, gasUsed uint64, err error) {}
 
+var (
+	formatPool = sync.Pool{
+		New: func() interface{} {
+			return make([]types.StructLogRes, 0, 128)
+		},
+	}
+)
+
 // FormatLogs formats EVM returned structured logs for json output
 func FormatLogs(logs []StructLog) []types.StructLogRes {
-	formatted := make([]types.StructLogRes, len(logs))
+	formatted := formatPool.Get().([]types.StructLogRes)
+	runtime.SetFinalizer(&formatted, func(format *[]types.StructLogRes) {
+		for _, res := range *format {
+			res.ExtraData = nil
+			res.Storage = nil
+			res.Stack = res.Stack[:0]
+			res.Memory = res.Memory[:0]
+		}
+		formatPool.Put(*format)
+	})
+
 	for index, trace := range logs {
-		formatted[index] = types.StructLogRes{
+		formatted = append(formatted, types.StructLogRes{
 			Pc:            trace.Pc,
 			Op:            trace.Op.String(),
 			Gas:           trace.Gas,
@@ -453,27 +471,29 @@ func FormatLogs(logs []StructLog) []types.StructLogRes {
 			Depth:         trace.Depth,
 			RefundCounter: trace.RefundCounter,
 			Error:         trace.ErrorString(),
-		}
+		})
 		if len(trace.Stack) != 0 {
-			stack := make([]string, len(trace.Stack))
+			if formatted[index].Stack == nil {
-			for i, stackValue := range trace.Stack {
+				formatted[index].Stack = make([]string, 0, len(trace.Stack))
-				stack[i] = stackValue.Hex()
+			}
+			for _, stackValue := range trace.Stack {
+				formatted[index].Stack = append(formatted[index].Stack, stackValue.Hex())
 			}
-			formatted[index].Stack = &stack
 		}
 		if trace.Memory.Len() != 0 {
-			memory := make([]string, 0, (trace.Memory.Len()+31)/32)
+			if formatted[index].Memory == nil {
-			for i := 0; i+32 <= trace.Memory.Len(); i += 32 {
+				formatted[index].Memory = make([]string, 0, (trace.Memory.Len()+31)/32)
-				memory = append(memory, fmt.Sprintf("%x", trace.Memory.Bytes()[i:i+32]))
+			}
+			for i := 0; i+32 <= trace.Memory.Len(); i += 32 {
+				formatted[index].Memory = append(formatted[index].Memory, common.Bytes2Hex(trace.Memory.Bytes()[i:i+32]))
 			}
-			formatted[index].Memory = &memory
 		}
 		if len(trace.Storage) != 0 {
 			storage := make(map[string]string)
 			for i, storageValue := range trace.Storage {
-				storage[fmt.Sprintf("%x", i)] = fmt.Sprintf("%x", storageValue)
+				storage[i.Hex()] = storageValue.Hex()
 			}
-			formatted[index].Storage = &storage
+			formatted[index].Storage = storage
 		}
 		if trace.ExtraData != nil {
 			formatted[index].ExtraData = trace.ExtraData.SealExtraData()

core/vm/logger_trace.go

@@ -161,12 +161,13 @@ func getWrappedProofForStorage(l *StructLogger, address common.Address, key comm
 	}, nil
 }
 
-func encodeProof(proof [][]byte) (res []string) {
+func encodeProof(proof [][]byte) []string {
 	if len(proof) == 0 {
 		return nil
 	}
+	res := make([]string, 0, len(proof))
 	for _, node := range proof {
 		res = append(res, hexutil.Encode(node))
 	}
-	return
+	return res
 }