op-node: Add L1BlockRefFromHeader

op-node/eth/id.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 
 	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/types"
 )
 
 type BlockID struct {
@@ -47,6 +48,15 @@ type L1BlockRef struct {
 	Time       uint64      `json:"timestamp"`
 }
 
+func L1BlockRefFromHeader(block *types.Header) L1BlockRef {
+	return L1BlockRef{
+		Hash:       block.Hash(),
+		Number:     block.Number.Uint64(),
+		ParentHash: block.ParentHash,
+		Time:       block.Time,
+	}
+}
+
 func (id L1BlockRef) String() string {
 	return fmt.Sprintf("%s:%d", id.Hash.String(), id.Number)
 }