Remove five second ticker and replace with sleep

This prevents the process from waking up every five seconds even when
there are no requests

glist/glist.go

@@ -34,29 +34,32 @@ func NewGList(chatID int, items ...string) *GList {
 	return &g
 }
 
-var reqs chan *GList
+var PersistReqC chan<- *GList
 
-func DoPersist() {
-	reqs = make(chan *GList, 50)
+func startPersistenceGoR() {
+	reqs := make(chan *GList, 50)
+	PersistReqC = reqs
 	go func() {
-		for range time.Tick(5 * time.Second) {
 		lists := map[*GList]struct{}{}
-		loop:
-			for {
-				select {
-				case g := <-reqs:
+		for g := range reqs {
+			lists[g] = struct{}{}
+			time.Sleep(5 * time.Second)
+			for len(reqs) > 0 {
+				g := <-reqs
 				lists[g] = struct{}{}
-				default:
-					break loop
-				}
 			}
 			for g := range lists {
 				g.persist()
 			}
+			lists = make(map[*GList]struct{}, len(lists))
 		}
 	}()
 }
 
+func init() {
+	startPersistenceGoR()
+}
+
 func (g *GList) persist() {
 	g.Mutex.Lock()
 	defer g.Mutex.Unlock()
@@ -80,14 +83,14 @@ outer:
 		}
 		g.Items = append(g.Items, Entry{text, false})
 	}
-	reqs <- g
+	PersistReqC <- g
 }
 
 func (g *GList) Toggle(text string) error {
 	for i, item := range g.Items {
 		if item.Text == text {
 			g.Items[i].Checked = !g.Items[i].Checked
-			reqs <- g
+			PersistReqC <- g
 			return nil
 		}
 	}
@@ -102,7 +105,7 @@ func (g *GList) ClearChecked() {
 		}
 	}
 	g.Items = remaining
-	reqs <- g
+	PersistReqC <- g
 }
 
 type button struct {

glist/glist_test.go

@@ -23,7 +23,8 @@ func TestGList(t *testing.T) {
 
 func TestSplit(t *testing.T) {
 	g := GList{}
-	reqs = make(chan *GList, 50)
+	//This resets the channel, so test does not try to persist
+	PersistReqC = make(chan *GList, 50)
 	g.Add("foo")
 	g.Add("bar\nfoo\nblah")
 	g.Add("foo")

main.go

@@ -50,7 +50,6 @@ func main() {
 	}()
 
 	glist.DataPath = dataPath
-	glist.DoPersist()
 
 	log.Printf("Grocery List bot starting with datapath:%s, port:%d\n", dataPath, port)