From 6c4ec676fef866015364622be1cbf3ae64dfd6fd Mon Sep 17 00:00:00 2001
From: Ian Gulliver <ian@flamingcow.tv>
Date: Wed, 25 Nov 2020 20:13:39 +0000
Subject: [PATCH] Monotonic time for stale removal

---
 main.go | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/main.go b/main.go
index 593cb21..2cbcdf1 100644
--- a/main.go
+++ b/main.go
@@ -189,11 +189,11 @@ func scan() {
 	mu.Lock()
 	defer mu.Unlock()
 
-	cutoff := time.Now().UTC().Add(-30 * time.Second)
+	grace := 30 * time.Second
 
 	for _, rm := range roomById {
 		for _, c := range rm.clientById {
-			if c.lastSeen.Before(cutoff) {
+			if time.Now().Sub(c.lastSeen) > grace {
 				c.remove()
 			}
 		}