From 984f2a568cffef5533fc7d6b444ed7c762812011 Mon Sep 17 00:00:00 2001
From: Knut Ahlers <knut@ahlers.me>
Date: Mon, 29 Nov 2021 18:34:14 +0100
Subject: [PATCH] Prevent duplicate execution due to truncating to second

Signed-off-by: Knut Ahlers <knut@ahlers.me>
---
 main.go      | 2 +-
 scheduler.go | 4 +++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/main.go b/main.go
index c3d46fb..73ab979 100644
--- a/main.go
+++ b/main.go
@@ -74,7 +74,7 @@ func main() {
 	}
 
 	scheduler := cron.New()
-	scheduler.AddFunc("@every 1m", schedulerRun)
+	scheduler.AddFunc(fmt.Sprintf("@every %s", schedulerInterval), schedulerRun)
 	scheduler.Start()
 
 	router = mux.NewRouter()
diff --git a/scheduler.go b/scheduler.go
index 435565e..29ee9a6 100644
--- a/scheduler.go
+++ b/scheduler.go
@@ -15,6 +15,8 @@ import (
 	"github.com/Luzifer/go-latestver/internal/fetcher"
 )
 
+const schedulerInterval = time.Minute
+
 var schedulerRunActive bool
 
 func schedulerRun() {
@@ -110,7 +112,7 @@ func nextCheckTime(ce *database.CatalogEntry, lastCheck *time.Time) time.Time {
 		Truncate(cfg.CheckDistribution).
 		Add(time.Duration(jitter) % cfg.CheckDistribution)
 
-	if next.Before(*lastCheck) {
+	if next.Before((*lastCheck).Add(schedulerInterval)) {
 		next = next.Add(cfg.CheckDistribution)
 	}