Restructuring update/download threads.

main.go

@@ -203,6 +203,7 @@ type dlQueue struct {
 	respch chan *grab.Response
 	sync.Mutex
 	wg sync.WaitGroup
+	wake chan struct{}
 }
 
 func (q *dlQueue) Sort() {
@@ -225,6 +226,7 @@ func (q *dlQueue) Waiting() *dlQueue {
 		respch: q.respch,
 		Mutex: q.Mutex,
 		wg: q.wg,
+		wake: q.wake,
 	}
 	for _,i := range q.items {
 		if i.downloading == false {
@@ -258,7 +260,7 @@ func NewDaemon(conf Config, pl *pcList) *Daemon {
 		conf: conf,
 		g: grab.NewClient(),
 		pl: pl,
-		queue: &dlQueue{},
+		queue: &dlQueue{ wake: make(chan struct{}) },
 		dlwake: make(chan struct{}),
 	}
 }
@@ -282,7 +284,7 @@ func (d *Daemon) Monitor() {
 			100*resp.Progress())
 	}
 	mon := func(resp *grab.Response) {
-		t := time.NewTicker(1 * time.Second)
+		t := time.NewTicker(5 * time.Second)
 		defer t.Stop()
 		Loop:
 		for {
@@ -303,7 +305,7 @@ func (d *Daemon) Monitor() {
 	}
 }
 
-func (d *Daemon) Downloader() {
+func (d *Daemon) StartDownloader() {
 	log.Print("Downloader(): starting")
 	d.queue.reqch = make(chan *grab.Request)
 	d.queue.respch = make(chan *grab.Response)
@@ -323,38 +325,44 @@ func (d *Daemon) Downloader() {
 		d.queue.items = make([]*dlItem,0)
 		d.queue.Unlock()
 	}
-	upd := make(chan struct{})
-	go func() {
-		t := time.NewTicker(30 * time.Second)
-		defer t.Stop()
-		for {
-			// lock Podcast list and update download queue
-			log.Print("Downloader(): Updating podcast list")
-			d.queue.Lock()
-			for _,p := range d.pl.Podcasts {
-				for _,i := range p.Items {
-					d.queue.Add(&i)
-				}
-			}
-			log.Print("Downloader(): Done updating podcast list")
-			d.queue.Unlock()
-			upd<- struct{}{}
-			select {
-			case <-t.C:
-				continue
-			case <-d.dlwake:
-				continue
+	go d.QueueUpdater()
+	go d.queue.Downloader()
+}
+
+func (d *Daemon) QueueUpdater() {
+	t := time.NewTicker(30 * time.Second)
+	defer t.Stop()
+	for {
+		// lock Podcast list and update download queue
+		log.Print("QueueUpdater(): Updating download queue")
+		d.queue.Lock()
+		for _,p := range d.pl.Podcasts {
+			for _,i := range p.Items {
+				d.queue.Add(&i)
 			}
 		}
-	}()
+		log.Print("QueueUpdater(): Done updating download queue")
+		d.queue.Unlock()
+		d.queue.wake<- struct{}{}
+		log.Print("QueueUpdater(): Sleeping")
+		select {
+		case <-t.C:
+			continue
+		case <-d.dlwake:
+			continue
+		}
+	}
+}
+
+func (q *dlQueue) Downloader() {
+	t := time.NewTicker(30 * time.Second)
+	defer t.Stop()
 	LOOP:
 	for {
-		t := time.NewTicker(30 * time.Second)
-		defer t.Stop()
 		// launch requests for files we are not yet downloading
-		d.queue.Lock()
-		waiting := d.queue.Waiting()
-		d.queue.Unlock()
+		q.Lock()
+		waiting := q.Waiting()
+		q.Unlock()
 		log.Print("Download queue length: ",len(waiting.items))
 		for _,i := range waiting.items {
 			if !i.downloading {
@@ -366,18 +374,17 @@ func (d *Daemon) Downloader() {
 				}
 				i.downloading = true
 				t := time.Now()
-				d.queue.reqch <- req
+				q.reqch <- req
 				if time.Now().After(t.Add(5 * time.Second)) {
 					continue LOOP // refresh list
 				}
 			}
 		}
-		log.Print("Downloader(): Done launching downloads")
 		log.Print("Downloader(): sleeping")
 		select {
 		case <-t.C:
 			continue
-		case <-upd:
+		case <-q.wake:
 			continue
 		}
 	}
@@ -385,7 +392,7 @@ func (d *Daemon) Downloader() {
 
 func (d *Daemon) Updater() {
 	log.Print("Updater(): starting")
-	go d.Downloader()
+	d.StartDownloader()
 	for {
 		time.Sleep(1 * time.Second)
 		d.Update(d.conf.Urls)
@@ -399,7 +406,6 @@ func (d *Daemon) Updater() {
 			enc.Encode(d.pl)
 			d.Unlock()
 			of.Close()
-			log.Print("Updater(): done writing")
 		}
 		d.dlwake <-struct{}{}
 		time.Sleep(30 * time.Minute)