From 88e8faa3f6bda7286ae6d70004b0fdf8c6895829 Mon Sep 17 00:00:00 2001
From: sh-cha <snghuncha@gmail.com>
Date: Mon, 18 Nov 2024 21:39:56 +0900
Subject: [PATCH] allow fee granter to free lane

---
 x/opchild/lanes/free.go      | 10 +++++++++-
 x/opchild/lanes/free_test.go | 22 +++++++++++++++++++---
 2 files changed, 28 insertions(+), 4 deletions(-)

diff --git a/x/opchild/lanes/free.go b/x/opchild/lanes/free.go
index 344ec450..da6cab73 100644
--- a/x/opchild/lanes/free.go
+++ b/x/opchild/lanes/free.go
@@ -39,8 +39,16 @@ func (h FreeLaneMatchHandler) MatchHandler() base.MatchHandler {
 		} else if payer, err := h.ac.BytesToString(feeTx.FeePayer()); err != nil {
 			return false
 		} else {
+			var granter string
+			if feeTx.FeeGranter() != nil {
+				granter, err = h.ac.BytesToString(feeTx.FeeGranter())
+				if err != nil {
+					return false
+				}
+			}
+
 			for _, addr := range whitelist {
-				if addr == payer {
+				if addr == payer || addr == granter {
 					return true
 				}
 			}
diff --git a/x/opchild/lanes/free_test.go b/x/opchild/lanes/free_test.go
index c18fcdf9..a35d4c8b 100644
--- a/x/opchild/lanes/free_test.go
+++ b/x/opchild/lanes/free_test.go
@@ -52,14 +52,30 @@ func Test_FreeLaneMatchHandler(t *testing.T) {
 	require.True(t, handler(ctx, MockTx{
 		feePayer: []byte{3, 4, 5, 6},
 	}))
+
+	require.True(t, handler(ctx, MockTx{
+		feePayer:   []byte{2, 3, 4, 5},
+		feeGranter: []byte{0, 1, 2, 3},
+	}))
+
+	require.True(t, handler(ctx, MockTx{
+		feePayer:   []byte{2, 3, 4, 5},
+		feeGranter: []byte{3, 4, 5, 6},
+	}))
+
+	require.False(t, handler(ctx, MockTx{
+		feePayer:   []byte{2, 3, 4, 5},
+		feeGranter: []byte{2, 3, 5, 6},
+	}))
 }
 
 var _ sdk.Tx = MockTx{}
 var _ sdk.FeeTx = &MockTx{}
 
 type MockTx struct {
-	msgs     []sdk.Msg
-	feePayer []byte
+	msgs       []sdk.Msg
+	feePayer   []byte
+	feeGranter []byte
 }
 
 func (tx MockTx) GetMsgsV2() ([]protov2.Message, error) {
@@ -82,5 +98,5 @@ func (tx MockTx) FeePayer() []byte {
 	return tx.feePayer
 }
 func (tx MockTx) FeeGranter() []byte {
-	return nil
+	return tx.feeGranter
 }