fix refresh sync

src/assets/javascripts/app.js

@@ -633,10 +633,7 @@ var vm = new Vue({
     fetchAllFeeds: function() {
       if (this.loading.feeds) return
       api.feeds.refresh().then(function() {
-        // TODO: this is hacky. come up with something decent
-        setTimeout(function() {
-          vm.refreshStats()
-        }, 1000)
+        vm.refreshStats()
       })
     },
     computeStats: function() {

src/worker/worker.go

@@ -9,6 +9,8 @@ import (
 	"github.com/nkanaev/yarr/src/storage"
 )
 
+const NUM_WORKERS = 4
+
 type Worker struct {
 	db      *storage.Storage
 	pending *int32
@@ -89,30 +91,34 @@ func (w *Worker) SetRefreshRate(minute int64) {
 }
 
 func (w *Worker) RefreshFeeds() {
-	log.Print("Refreshing feeds")
-	go w.refresher()
-}
-
-func (w *Worker) refresher() {
 	w.reflock.Lock()
+	defer w.reflock.Unlock()
 
-	w.db.ResetFeedErrors()
-
-	feeds := w.db.ListFeeds()
-	if len(feeds) == 0 {
+	if *w.pending > 0 {
+		log.Print("Refreshing already in progress")
 		return
 	}
 
+	feeds := w.db.ListFeeds()
+	if len(feeds) == 0 {
+		log.Print("Nothing to refresh")
+		return
+	}
+
+	log.Print("Refreshing feeds")
 	atomic.StoreInt32(w.pending, int32(len(feeds)))
+	go w.refresher(feeds)
+}
+
+func (w *Worker) refresher(feeds []storage.Feed) {
+	w.db.ResetFeedErrors()
 
 	srcqueue := make(chan storage.Feed, len(feeds))
 	dstqueue := make(chan []storage.Item)
 
-	// hardcoded to 4 workers ;)
-	go w.worker(srcqueue, dstqueue)
-	go w.worker(srcqueue, dstqueue)
-	go w.worker(srcqueue, dstqueue)
-	go w.worker(srcqueue, dstqueue)
+	for i := 0; i < NUM_WORKERS; i++ {
+		go w.worker(srcqueue, dstqueue)
+	}
 
 	for _, feed := range feeds {
 		srcqueue <- feed
@@ -120,14 +126,12 @@ func (w *Worker) refresher() {
 	for i := 0; i < len(feeds); i++ {
 		w.db.CreateItems(<-dstqueue)
 		atomic.AddInt32(w.pending, -1)
+		w.db.SyncSearch()
 	}
 	close(srcqueue)
 	close(dstqueue)
 
-	w.db.SyncSearch()
 	log.Printf("Finished refreshing %d feeds", len(feeds))
-
-	w.reflock.Unlock()
 }
 
 func (w *Worker) worker(srcqueue <-chan storage.Feed, dstqueue chan<- []storage.Item) {