privval: fix ping message encoding (#5442)

Fixes #5371.

CHANGELOG_PENDING.md

@@ -28,3 +28,5 @@ Friendly reminder, we have a [bug bounty program](https://hackerone.com/tendermi
 
 ### BUG FIXES
 
+- [privval] \#5441 Fix faulty ping message encoding causing nil message errors in logs (@erikgrinaker)
+

privval/msgs.go

@@ -29,11 +29,11 @@ func mustWrapMsg(pb proto.Message) privvalproto.Message {
 	case *privvalproto.SignProposalRequest:
 		msg.Sum = &privvalproto.Message_SignProposalRequest{SignProposalRequest: pb}
 	case *privvalproto.PingRequest:
-		msg.Sum = &privvalproto.Message_PingRequest{}
+		msg.Sum = &privvalproto.Message_PingRequest{PingRequest: pb}
 	case *privvalproto.PingResponse:
-		msg.Sum = &privvalproto.Message_PingResponse{}
+		msg.Sum = &privvalproto.Message_PingResponse{PingResponse: pb}
 	default:
-		panic(fmt.Errorf("unknown message type %T", msg))
+		panic(fmt.Errorf("unknown message type %T", pb))
 	}
 
 	return msg

privval/msgs_test.go

@@ -78,8 +78,8 @@ func TestPrivvalVectors(t *testing.T) {
 		msg      proto.Message
 		expBytes string
 	}{
-		{"ping request", &privproto.PingRequest{}, ""},
-		{"ping response", &privproto.PingResponse{}, ""},
+		{"ping request", &privproto.PingRequest{}, "3a00"},
+		{"ping response", &privproto.PingResponse{}, "4200"},
 		{"pubKey request", &privproto.PubKeyRequest{}, "0a00"},
 		{"pubKey response", &privproto.PubKeyResponse{PubKey: &ppk, Error: nil}, "12240a220a20556a436f1218d30942efe798420f51dc9b6a311b929c578257457d05c5fcf230"},
 		{"pubKey response with error", &privproto.PubKeyResponse{PubKey: nil, Error: remoteError}, "121212100801120c697427732061206572726f72"},