From 113172d8aa5f8b1d5b13eda7a35e42f2c1a960b7 Mon Sep 17 00:00:00 2001
From: Nishant Das <nishdas93@gmail.com>
Date: Wed, 26 Jul 2023 08:38:25 +0800
Subject: [PATCH] Exit Initial Sync Early (#12659)

* add check

* fix test
---
 beacon-chain/sync/initial-sync/service.go      | 6 ++++++
 beacon-chain/sync/initial-sync/service_test.go | 8 ++++++++
 2 files changed, 14 insertions(+)

diff --git a/beacon-chain/sync/initial-sync/service.go b/beacon-chain/sync/initial-sync/service.go
index 9ff9d2c27..0cc94edf6 100644
--- a/beacon-chain/sync/initial-sync/service.go
+++ b/beacon-chain/sync/initial-sync/service.go
@@ -89,6 +89,12 @@ func (s *Service) Start() {
 		log.Debug("Exiting Initial Sync Service")
 		return
 	}
+	// Exit entering round-robin sync if we require 0 peers to sync.
+	if flags.Get().MinimumSyncPeers == 0 {
+		s.markSynced()
+		log.WithField("genesisTime", gt).Info("Due to number of peers required for sync being set at 0, entering regular sync immediately.")
+		return
+	}
 	if gt.After(prysmTime.Now()) {
 		s.markSynced()
 		log.WithField("genesisTime", gt).Info("Genesis time has not arrived - not syncing")
diff --git a/beacon-chain/sync/initial-sync/service_test.go b/beacon-chain/sync/initial-sync/service_test.go
index 4659a99eb..a61a00b73 100644
--- a/beacon-chain/sync/initial-sync/service_test.go
+++ b/beacon-chain/sync/initial-sync/service_test.go
@@ -31,6 +31,14 @@ func TestService_Constants(t *testing.T) {
 
 func TestService_InitStartStop(t *testing.T) {
 	hook := logTest.NewGlobal()
+	resetFlags := flags.Get()
+	flags.Init(&flags.GlobalFlags{
+		MinimumSyncPeers: 1,
+	})
+	defer func() {
+		flags.Init(resetFlags)
+	}()
+
 	tests := []struct {
 		name         string
 		assert       func()