From 2e86352fa4c5dc5d9b3b2af5d223977cc3109a61 Mon Sep 17 00:00:00 2001
From: Petter Rodhelind <petter.rodhelind@gmail.com>
Date: Sun, 21 Feb 2021 23:19:34 +0100
Subject: Cache cleanup on cacheTimeout.

---
 main.go | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/main.go b/main.go
index 87d40fa..1b93d8d 100644
--- a/main.go
+++ b/main.go
@@ -143,7 +143,7 @@ func fetch(group string) (c *channel, err error) {
 
 	url := "https://www.facebook.com/pg/" + group + "/posts/"
 
-	log.Println("Fetching: ", url)
+	log.Println("Fetching:", url)
 
 	resp, err := http.Get(url)
 	if err != nil {
@@ -162,6 +162,21 @@ func fetch(group string) (c *channel, err error) {
 }
 
 func main() {
+	// clean the cache when channels have expired
+	go func() {
+		for {
+			time.Sleep(time.Duration(cacheTimeout) * time.Second)
+			for k, c := range cache.v {
+				if time.Now().Sub(c.Time).Seconds() > cacheTimeout {
+					cache.Lock()
+					delete(cache.v, k)
+					cache.Unlock()
+					log.Println("Removed from cache:", k)
+				}
+			}
+		}
+	}()
+
 	log.Println("Serving: http://localhost:1212")
 	http.ListenAndServe(":1212", handler{})
 }
-- 
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