eth/tracer/live: add noop live tracer

Author: sonhv0212

eth/tracers/live/noop.go

@@ -0,0 +1,96 @@
+package live
+
+import (
+	"encoding/json"
+	"math/big"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/tracing"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/eth/tracers"
+	"github.com/ethereum/go-ethereum/params"
+)
+
+func init() {
+	tracers.LiveDirectory.Register("noop", newNoopTracer)
+}
+
+// noop is a no-op live tracer. It's there to
+// catch changes in the tracing interface, as well as
+// for testing live tracing performance. Can be removed
+// as soon as we have a real live tracer.
+type noop struct{}
+
+func newNoopTracer(_ json.RawMessage) (*tracing.Hooks, error) {
+	t := &noop{}
+	return &tracing.Hooks{
+		OnTxStart:        t.OnTxStart,
+		OnTxEnd:          t.OnTxEnd,
+		OnEnter:          t.OnEnter,
+		OnExit:           t.OnExit,
+		OnOpcode:         t.OnOpcode,
+		OnFault:          t.OnFault,
+		OnGasChange:      t.OnGasChange,
+		OnBlockchainInit: t.OnBlockchainInit,
+		OnBlockStart:     t.OnBlockStart,
+		OnBlockEnd:       t.OnBlockEnd,
+		OnSkippedBlock:   t.OnSkippedBlock,
+		OnGenesisBlock:   t.OnGenesisBlock,
+		OnBalanceChange:  t.OnBalanceChange,
+		OnNonceChange:    t.OnNonceChange,
+		OnCodeChange:     t.OnCodeChange,
+		OnStorageChange:  t.OnStorageChange,
+		OnLog:            t.OnLog,
+	}, nil
+}
+
+func (t *noop) OnOpcode(pc uint64, op byte, gas, cost uint64, scope tracing.OpContext, rData []byte, depth int, err error) {
+}
+
+func (t *noop) OnFault(pc uint64, op byte, gas, cost uint64, _ tracing.OpContext, depth int, err error) {
+}
+
+func (t *noop) OnEnter(depth int, typ byte, from common.Address, to common.Address, input []byte, gas uint64, value *big.Int, order uint64) {
+}
+
+func (t *noop) OnExit(depth int, output []byte, gasUsed uint64, err error, reverted bool) {
+}
+
+func (t *noop) OnTxStart(vm *tracing.VMContext, tx *types.Transaction, from common.Address) {
+}
+
+func (t *noop) OnTxEnd(receipt *types.Receipt, err error) {
+}
+
+func (t *noop) OnBlockStart(ev tracing.BlockEvent) {
+}
+
+func (t *noop) OnBlockEnd(err error) {
+}
+
+func (t *noop) OnSkippedBlock(ev tracing.BlockEvent) {}
+
+func (t *noop) OnBlockchainInit(chainConfig *params.ChainConfig) {
+}
+
+func (t *noop) OnGenesisBlock(b *types.Block, alloc types.GenesisAlloc) {
+}
+
+func (t *noop) OnBalanceChange(a common.Address, prev, new *big.Int, reason tracing.BalanceChangeReason) {
+}
+
+func (t *noop) OnNonceChange(a common.Address, prev, new uint64) {
+}
+
+func (t *noop) OnCodeChange(a common.Address, prevCodeHash common.Hash, prev []byte, codeHash common.Hash, code []byte) {
+}
+
+func (t *noop) OnStorageChange(a common.Address, k, prev, new common.Hash) {
+}
+
+func (t *noop) OnLog(l *types.Log) {
+
+}
+
+func (t *noop) OnGasChange(old, new uint64, reason tracing.GasChangeReason) {
+}