Lazily load old feeds when triggered

main.go

@@ -22,14 +22,26 @@ func main() {
 	}
 	defer sclient.Close()
 
-	// need to load old from file
 	allFeeds := make(map[string]*rss.Feed)
 	mon, err := monitor.New(config.MonitorPort, func(url string) {
 		feed, ok := allFeeds[url]
 		if !ok {
-			logger.Log("unknown feed triggered in monitor: %q", url)
+			f, err := rss.New(url, "", "")
+			if err != nil {
+				logger.Log("cannot identify unknown feed triggered in monitor: %q: %v", url, err)
 				return
 			}
+			b, err := sclient.Get(nsForFeeds, f.ID())
+			if err != nil {
+				logger.Log("cannot get unknown feed triggered in monitor: %q: %v", url, err)
+				return
+			}
+			feed, err = rss.Deserialize(b)
+			if err != nil {
+				logger.Log("cannot deserialize feed triggered in monitor: %q: %v", url, err)
+				return
+			}
+		}
 		items, err := allFeeds[url].Update()
 		if err != nil {
 			logger.Log("can't update old RSS %q: %v", url, err)