From 61e000647bc1f1682f746ed36da1f9a43805d368 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=D0=98=D0=B2=D0=B0=D0=BD=20=D0=9D=D0=B0=D0=B9=D0=B4=D0=B5?=
 =?UTF-8?q?=D0=BD=D0=BE=D0=B2?= <i.naidenov@corp.mail.ru>
Date: Wed, 7 May 2025 16:27:19 +0300
Subject: [PATCH] Add on_before_reload callback

package.reload call it before reload
it stop reload if fail
---
 config.lua | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/config.lua b/config.lua
index edc2dca..e68721c 100644
--- a/config.lua
+++ b/config.lua
@@ -812,6 +812,18 @@ local M
 				enforce_ro = M._enforced_ro,
 			}
 		end,
+		on_before_reload = function()	
+			-- stop reload if
+			-- * etcd is unavailable
+			-- * etcd has no configuration
+			if M.etcd then
+				log.info('Try to discovery etcd before reload')
+				M.etcd:discovery()
+
+				log.info('Try to get etcd config before reload')
+				assert(M.etcd:get_all(), 'etcd has no configuration')
+			end
+		end,
 		_load_cfg = load_cfg,
 	},{
 		---Reinitiates moonlibs.config