From 8f6ea671c6459e2b8e4739def505910eea0d191d Mon Sep 17 00:00:00 2001
From: "Alexander \"Arav\" Andreev" <me@arav.top>
Date: Mon, 27 Jun 2022 01:05:44 +0400
Subject: [PATCH] Made use of mutex in a goroutine that cleans expired
 captchas.

---
 pkg/captcha/db.go | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/pkg/captcha/db.go b/pkg/captcha/db.go
index c58da36..e8963b4 100644
--- a/pkg/captcha/db.go
+++ b/pkg/captcha/db.go
@@ -55,6 +55,8 @@ func (cdb *CaptchaDB) SetExpiry(expire time.Duration) {
 
 			for id, captcha := range cdb.DB {
 				if time.Now().Sub(captcha.Expiry()) <= 0 {
+					cdb.Lock()
+					defer cdb.Unlock()
 					delete(cdb.DB, id)
 				}
 			}