use stop group instead of wait group

refactoring
address reviews

manager.go

@@ -136,12 +136,6 @@ const (
 	VideoStatusFailed    = "failed"
 )
 
-type apiVideoStatusResponse struct {
-	Success bool        `json:"success"`
-	Error   null.String `json:"error"`
-	Data    null.String `json:"data"`
-}
-
 func (s SyncManager) MarkVideoStatus(channelID string, videoID string, status string, claimID string, claimName string, failureReason string) error {
 	endpoint := s.ApiURL + "/yt/video_status"
 
@@ -165,7 +159,11 @@ func (s SyncManager) MarkVideoStatus(channelID string, videoID string, status st
 	res, _ := http.PostForm(endpoint, vals)
 	defer res.Body.Close()
 	body, _ := ioutil.ReadAll(res.Body)
-	var response apiVideoStatusResponse
+	var response struct {
+		Success bool        `json:"success"`
+		Error   null.String `json:"error"`
+		Data    null.String `json:"data"`
+	}
 	err := json.Unmarshal(body, &response)
 	if err != nil {
 		return err

setup.go

@@ -14,8 +14,8 @@ import (
 
 func (s *Sync) walletSetup() error {
 	//prevent unnecessary concurrent execution
-	s.mux.Lock()
-	defer s.mux.Unlock()
+	s.walletMux.Lock()
+	defer s.walletMux.Unlock()
 	err := s.ensureChannelOwnership()
 	if err != nil {
 		return err
@@ -30,27 +30,28 @@ func (s *Sync) walletSetup() error {
 	balance := decimal.Decimal(*balanceResp)
 	log.Debugf("Starting balance is %s", balance.String())
 
-	var numOnSource uint64
+	var numOnSource int
 	if s.LbryChannelName == "@UCBerkeley" {
 		numOnSource = 10104
 	} else {
-		numOnSource, err = s.CountVideos()
+		n, err := s.CountVideos()
 		if err != nil {
 			return err
 		}
+		numOnSource = int(n)
 	}
 	log.Debugf("Source channel has %d videos", numOnSource)
 	if numOnSource == 0 {
 		return nil
 	}
 
-	s.videosMapMux.Lock()
-	numPublished := uint64(len(s.syncedVideos)) //should we only count published videos? Credits are allocated even for failed ones...
-	s.videosMapMux.Unlock()
+	s.syncedVideosMux.Lock()
+	numPublished := len(s.syncedVideos) //should we only count published videos? Credits are allocated even for failed ones...
+	s.syncedVideosMux.Unlock()
 	log.Debugf("We already published %d videos", numPublished)
 
-	if float64(numOnSource)-float64(numPublished) > float64(s.Manager.VideosLimit) {
-		numOnSource = uint64(s.Manager.VideosLimit)
+	if numOnSource-numPublished > s.Manager.VideosLimit {
+		numOnSource = s.Manager.VideosLimit
 	}
 
 	minBalance := (float64(numOnSource)-float64(numPublished))*(publishAmount+0.1) + channelClaimAmount

ytsync.go

@@ -66,18 +66,17 @@ type Sync struct {
 	videoDirectory  string
 	db              *redisdb.DB
 	syncedVideos    map[string]syncedVideo
+	syncedVideosMux *sync.Mutex
 	grp             *stop.Group
 	lbryChannelID   string
 
-	videosMapMux sync.Mutex
-	mux          sync.Mutex
-	wg           sync.WaitGroup
+	walletMux *sync.Mutex
 	queue     chan video
 }
 
 func (s *Sync) AppendSyncedVideo(videoID string, published bool, failureReason string) {
-	s.videosMapMux.Lock()
-	defer s.videosMapMux.Unlock()
+	s.syncedVideosMux.Lock()
+	defer s.syncedVideosMux.Unlock()
 	s.syncedVideos[videoID] = syncedVideo{
 		VideoID:       videoID,
 		Published:     published,
@@ -122,10 +121,25 @@ func (s *Sync) FullCycle() (e error) {
 	if s.YoutubeChannelID == "" {
 		return errors.Err("channel ID not provided")
 	}
+	s.syncedVideosMux = &sync.Mutex{}
+	s.walletMux = &sync.Mutex{}
+	s.db = redisdb.New()
+	s.grp = stop.New()
+	s.queue = make(chan video)
+	interruptChan := make(chan os.Signal, 1)
+	signal.Notify(interruptChan, os.Interrupt, syscall.SIGTERM)
+	go func() {
+		<-interruptChan
+		log.Println("Got interrupt signal, shutting down (if publishing, will shut down after current publish)")
+		s.grp.Stop()
+	}()
 	syncedVideos, err := s.Manager.setChannelStatus(s.YoutubeChannelID, StatusSyncing)
 	if err != nil {
 		return err
 	}
+	s.syncedVideosMux.Lock()
+	s.syncedVideos = syncedVideos
+	s.syncedVideosMux.Unlock()
 
 	defer func() {
 		if e != nil {
@@ -194,21 +208,6 @@ func (s *Sync) FullCycle() (e error) {
 		return errors.Wrap(err, 0)
 	}
 
-	s.db = redisdb.New()
-	s.videosMapMux.Lock()
-	s.syncedVideos = syncedVideos
-	s.videosMapMux.Unlock()
-	s.grp = stop.New()
-	s.queue = make(chan video)
-
-	interruptChan := make(chan os.Signal, 1)
-	signal.Notify(interruptChan, os.Interrupt, syscall.SIGTERM)
-	go func() {
-		<-interruptChan
-		log.Println("Got interrupt signal, shutting down (if publishing, will shut down after current publish)")
-		s.grp.Stop()
-	}()
-
 	log.Printf("Starting daemon")
 	err = startDaemonViaSystemd()
 	if err != nil {
@@ -263,7 +262,11 @@ func (s *Sync) doSync() error {
 	}
 
 	for i := 0; i < s.ConcurrentVideos; i++ {
-		go s.startWorker(i)
+		s.grp.Add(1)
+		go func() {
+			defer s.grp.Done()
+			s.startWorker(i)
+		}()
 	}
 
 	if s.LbryChannelName == "@UCBerkeley" {
@@ -272,14 +275,11 @@ func (s *Sync) doSync() error {
 		err = s.enqueueYoutubeVideos()
 	}
 	close(s.queue)
-	s.wg.Wait()
+	s.grp.Wait()
 	return err
 }
 
 func (s *Sync) startWorker(workerNum int) {
-	s.wg.Add(1)
-	defer s.wg.Done()
-
 	var v video
 	var more bool
 
@@ -510,9 +510,9 @@ func (s *Sync) processVideo(v video) (err error) {
 		log.Println(v.ID() + " took " + time.Since(start).String())
 	}(time.Now())
 
-	s.videosMapMux.Lock()
+	s.syncedVideosMux.Lock()
 	sv, ok := s.syncedVideos[v.ID()]
-	s.videosMapMux.Unlock()
+	s.syncedVideosMux.Unlock()
 	alreadyPublished := ok && sv.Published
 
 	neverRetryFailures := []string{