resolve refresh issues

pkg/api.go

@@ -63,8 +63,10 @@ func (api Api) Get(idx *Index, format Format) http.HandlerFunc {
 // refreshes the index by removing all entries, and fetching the feed.
 func (api Api) Refresh(idx *Index) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
+		tempUrls := make([]Url, len(idx.Urls))
+		copy(tempUrls, idx.Urls)
 		idx.Clear()
-		for _, url := range idx.Urls {
+		for _, url := range tempUrls {
 			log.Printf("refreshing: %s", url.Url)
 			err := idx.Add(url.Url, url.Category)
 			if err != nil {

pkg/index.go

@@ -23,11 +23,7 @@ func (idx *Index) Add(url string, category string) error {
 			item.parentFeed = &feed
 			idx.Rank = insertSorted(idx.Rank, &item)
 		}
-		idx.Urls = append(idx.Urls, struct {
-			Url      string
-			Category string
-			Size     int
-		}{url, category, len(feed.Channel.Items)})
+		idx.Urls = append(idx.Urls, Url{url, category, len(feed.Channel.Items)})
 		log.Printf("added to feed: '%s' %v", url, category)
 	}
 	return err
@@ -88,9 +84,10 @@ func (idx *Index) Serve(port string) {
 	log.Fatal(http.ListenAndServe(port, nil))
 }
 
-// removes all entries from rank.
+// removes all entries from rank, return copy of urls for re-create.
 func (idx *Index) Clear() {
 	idx.Rank = nil
+	idx.Urls = nil
 }
 
 // initiate rss feed index class (enforce singleton?)

pkg/types.go

@@ -44,13 +44,15 @@ type Feed struct {
 	Url      string
 }
 
+type Url struct {
+	Url      string
+	Category string
+	Size     int
+}
+
 type Index struct {
 	Rank []*Item
-	Urls []struct {
-		Url      string
-		Category string
-		Size     int
-	}
+	Urls []Url
 }
 
 type Query struct {