add trace_trasnaction api

eth/api_tx_trace.go

@@ -0,0 +1,65 @@
+// Copyright 2022 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 implements the general Ethereum API functions.
+
+package eth
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/rlp"
+
+	txtracelib "github.com/DeBankDeFi/etherlib/pkg/txtracev2"
+)
+
+// PublicTxTraceAPI provides an API to tracing transaction or block information.
+// // It offers only methods that operate on public data that is freely available to anyone.
+type PublicTxTraceAPI struct {
+	e *Ethereum
+}
+
+// NewPublicTxTraceAPI creates a new trace API.
+func NewPublicTxTraceAPI(e *Ethereum) *PublicTxTraceAPI {
+	return &PublicTxTraceAPI{e: e}
+}
+
+// Transaction trace_transaction function returns transaction traces.
+func (api *PublicTxTraceAPI) Transaction(ctx context.Context, txHash common.Hash) (interface{}, error) {
+	if api.e.blockchain == nil {
+		return []byte{}, fmt.Errorf("blockchain corruput")
+	}
+
+	raw, err := api.e.blockchain.TxTraceStore().ReadTxTrace(ctx, txHash)
+	if err != nil {
+		return []byte{}, err
+	}
+
+	if bytes.Equal(raw, []byte{}) { // empty response
+		return nil, fmt.Errorf("trace result of tx {%#v} not found in tracedb", txHash)
+	}
+
+	flatten := new(txtracelib.ActionTraceList)
+	err = rlp.DecodeBytes(raw, flatten)
+	if err != nil {
+		return nil, fmt.Errorf("failed to decode rlp flatten traces: %v", err)
+	}
+
+	return *flatten, nil
+}

eth/backend.go

@@ -368,6 +368,12 @@ func (s *Ethereum) APIs() []rpc.API {
 			Version:   "1.0",
 			Service:   NewPreExecAPI(s),
 			Public:    true,
+		}, {
+
+			Namespace: "trace",
+			Version:   "1.0",
+			Service:   NewPublicTxTraceAPI(s),
+			Public:    true,
 		},
 	}...)
 }