From 0aaaf34825a72ee5ec2c3f62fc7c67506df31e15 Mon Sep 17 00:00:00 2001
From: Sina Mahmoodi <itz.s1na@gmail.com>
Date: Thu, 8 Jun 2023 16:52:33 +0200
Subject: [PATCH] forgot the tracer

---
 internal/ethapi/transfertracer.go | 80 +++++++++++++++++++++++++++++++
 1 file changed, 80 insertions(+)
 create mode 100644 internal/ethapi/transfertracer.go

diff --git a/internal/ethapi/transfertracer.go b/internal/ethapi/transfertracer.go
new file mode 100644
index 0000000000..a853e38e6e
--- /dev/null
+++ b/internal/ethapi/transfertracer.go
@@ -0,0 +1,80 @@
+// Copyright 2023 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 ethapi
+
+import (
+	"math/big"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/ethereum/go-ethereum/core/vm"
+)
+
+type callLog struct {
+	Address common.Address `json:"address"`
+	Topics  []common.Hash  `json:"topics"`
+	Data    hexutil.Bytes  `json:"data"`
+}
+
+type transfer struct {
+	From  common.Address `json:"from"`
+	To    common.Address `json:"to"`
+	Value *big.Int       `json:"value"`
+}
+
+type tracer struct {
+	transfers []transfer
+}
+
+func newTracer() *tracer {
+	return &tracer{transfers: make([]transfer, 0)}
+}
+
+func (t *tracer) CaptureStart(env *vm.EVM, from common.Address, to common.Address, create bool, input []byte, gas uint64, value *big.Int) {
+	if value.Cmp(common.Big0) > 0 {
+		t.transfers = append(t.transfers, transfer{From: from, To: to, Value: value})
+	}
+
+}
+
+func (t *tracer) CaptureEnd(output []byte, gasUsed uint64, err error) {
+}
+
+func (t *tracer) CaptureState(pc uint64, op vm.OpCode, gas, cost uint64, scope *vm.ScopeContext, rData []byte, depth int, err error) {
+}
+
+func (t *tracer) CaptureFault(pc uint64, op vm.OpCode, gas, cost uint64, scope *vm.ScopeContext, depth int, err error) {
+}
+
+func (t *tracer) CaptureEnter(typ vm.OpCode, from common.Address, to common.Address, input []byte, gas uint64, value *big.Int) {
+	toCopy := to
+	if value.Cmp(common.Big0) > 0 {
+		t.transfers = append(t.transfers, transfer{From: from, To: toCopy, Value: value})
+	}
+}
+
+// CaptureExit is called when EVM exits a scope, even if the scope didn't
+// execute any code.
+func (t *tracer) CaptureExit(output []byte, gasUsed uint64, err error) {}
+
+func (t *tracer) CaptureTxStart(gasLimit uint64) {}
+
+func (t *tracer) CaptureTxEnd(restGas uint64) {}
+
+func (t *tracer) Transfers() []transfer {
+	return t.transfers
+}