core/types: implement log.EncodeRLP

Signed-off-by: jsvisa <delweng@gmail.com>

core/types/log.go

@@ -17,13 +17,13 @@
 package types
 
 import (
+	"io"
+
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/ethereum/go-ethereum/rlp"
 )
 
-//go:generate go run ../../rlp/rlpgen -type Log -out gen_log_rlp.go
-//go:generate go run github.com/fjl/gencodec -type Log -field-override logMarshaling -out gen_log_json.go
-
 // Log represents a contract log event. These events are generated by the LOG opcode and
 // stored/indexed by the node.
 type Log struct {
@@ -53,6 +53,23 @@ type Log struct {
 	Removed bool `json:"removed" rlp:"-"`
 }
 
+// EncodeRLP implements rlp.Encoder, and flattens all content fields of a log
+// into an RLP stream.
+func (log *Log) EncodeRLP(_w io.Writer) error {
+	w := rlp.NewEncoderBuffer(_w)
+	outerList := w.List()
+	w.WriteBytes(log.Address[:])
+	topicList := w.List()
+	for _, topic := range log.Topics {
+		w.WriteBytes(topic[:])
+	}
+	w.ListEnd(topicList)
+	w.WriteBytes(log.Data)
+	w.ListEnd(outerList)
+	return w.Flush()
+}
+
+//go:generate go run github.com/fjl/gencodec -type Log -field-override logMarshaling -out gen_log_json.go
 type logMarshaling struct {
 	Data        hexutil.Bytes
 	BlockNumber hexutil.Uint64