From f2927db86577ea7c491bf4d134f630a3a9f309be Mon Sep 17 00:00:00 2001
From: Tulir Asokan <tulir@maunium.net>
Date: Sat, 26 Aug 2023 16:45:11 +0300
Subject: [PATCH] Cancel batch sending if there's nothing to send

---
 backfill.go | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/backfill.go b/backfill.go
index 6d4e124..93fbb11 100644
--- a/backfill.go
+++ b/backfill.go
@@ -243,6 +243,14 @@ func (portal *Portal) backfillSendBatch(ctx context.Context, converted []*Conver
 			dbMessages = append(dbMessages, dbm)
 		}
 	}
+	if len(dbMessages) == 0 {
+		log.Warn().
+			Int("converted_count", len(converted)).
+			Int("event_count", len(events)).
+			Int("db_count", len(dbMessages)).
+			Msg("Didn't get any parts to send from converted messages")
+		return
+	}
 	forward := true
 	log.Debug().
 		Int("event_count", len(events)).