From 07e0168087be4493ebb0e64d5fbd689f85fb73d2 Mon Sep 17 00:00:00 2001
From: Felix Lange <fjl@twurst.com>
Date: Wed, 29 Apr 2026 16:08:46 +0200
Subject: [PATCH] eth/downloader: add syncmode in events

---
 eth/downloader/downloader.go | 8 ++++----
 eth/downloader/events.go     | 6 +++++-
 2 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/eth/downloader/downloader.go b/eth/downloader/downloader.go
index b7dfa77507..4a575d6856 100644
--- a/eth/downloader/downloader.go
+++ b/eth/downloader/downloader.go
@@ -437,17 +437,17 @@ func (d *Downloader) SubscribeSyncEvents(ch chan<- SyncEvent) event.Subscription
 // syncToHead starts a block synchronization based on the hash chain from
 // the specified head hash.
 func (d *Downloader) syncToHead() (err error) {
-	d.feed.Send(SyncEvent{Type: SyncStarted})
+	mode := d.getMode()
+	d.feed.Send(SyncEvent{Type: SyncStarted, Mode: mode})
 	defer func() {
 		// reset on error
 		if err != nil {
-			d.feed.Send(SyncEvent{Type: SyncFailed, Err: err})
+			d.feed.Send(SyncEvent{Type: SyncFailed, Mode: mode, Err: err})
 		} else {
 			latest := d.blockchain.CurrentHeader()
-			d.feed.Send(SyncEvent{Type: SyncCompleted, Latest: latest})
+			d.feed.Send(SyncEvent{Type: SyncCompleted, Mode: mode, Latest: latest})
 		}
 	}()
-	mode := d.getMode()
 
 	log.Debug("Backfilling with the network", "mode", mode)
 	defer func(start time.Time) {
diff --git a/eth/downloader/events.go b/eth/downloader/events.go
index 81cf75fa6f..0fb380a857 100644
--- a/eth/downloader/events.go
+++ b/eth/downloader/events.go
@@ -16,7 +16,10 @@
 
 package downloader
 
-import "github.com/ethereum/go-ethereum/core/types"
+import (
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/eth/ethconfig"
+)
 
 // SyncEventType represents the type of sync event
 type SyncEventType int
@@ -30,6 +33,7 @@ const (
 // SyncEvent represents a downloader synchronization event
 type SyncEvent struct {
 	Type   SyncEventType
+	Mode   ethconfig.SyncMode
 	Err    error         // Set when Type is SyncFailed
 	Latest *types.Header // Set when Type is SyncCompleted
 }