allow usage of custom clear interval

main.go

@@ -6,6 +6,7 @@ import (
 	"log"
 	"net/http"
 	"os"
+	"strconv"
 	"time"
 
 	"git.1e99.eu/1e99/passed/middlewares"
@@ -22,8 +23,20 @@ func run() error {
 		return err
 	}
 
+	clearIntervalString := os.Getenv("STORE_CLEAR_EXPIRED_INTERVAL")
+	if clearIntervalString == "" {
+		log.Printf("No STORE_CLEAR_EXPIRED_INTERVAL provided, defaulting to 30 seconds.")
+		clearIntervalString = "30"
+	}
+
+	clearInterval, err := strconv.ParseInt(clearIntervalString, 10, 64)
+	if err != nil {
+		log.Printf("STORE_CLEAR_EXPIRED_INTERVAL is not a number.")
+		clearInterval = 30
+	}
+
 	go func() {
-		ticker := time.Tick(20 * time.Second)
+		ticker := time.Tick(time.Duration(clearInterval) * time.Second)
 		for {
 			<-ticker