Finish v2 (sync whole channel)

local/local.go

@@ -20,6 +20,7 @@ type SyncContext struct {
 	DryRun              bool
 	KeepCache           bool
 	ReflectStreams      bool
+	ForceChannelScan    bool
 	TempDir             string
 	SyncDbPath          string
 	LbrynetAddr         string
@@ -75,6 +76,7 @@ func AddCommand(rootCmd *cobra.Command) {
 	cmd.Flags().BoolVar(&syncContext.DryRun, "dry-run", false, "Display information about the stream publishing, but do not publish the stream")
 	cmd.Flags().BoolVar(&syncContext.KeepCache, "keep-cache", false, "Don't delete local files after publishing.")
 	cmd.Flags().BoolVar(&syncContext.ReflectStreams, "reflect-streams", true, "Require published streams to be reflected.")
+	cmd.Flags().BoolVar(&syncContext.ForceChannelScan, "force-rescan", false, "Rescan channel to fill the sync DB.")
 	cmd.Flags().StringVar(&syncContext.TempDir, "temp-dir", getEnvDefault("TEMP_DIR", ""), "directory to use for temporary files")
 	cmd.Flags().StringVar(&syncContext.SyncDbPath, "sync-db-path", getEnvDefault("SYNC_DB_PATH", ""), "Path to the local sync DB")
 	cmd.Flags().Float64Var(&syncContext.PublishBid, "publish-bid", 0.01, "Bid amount for the stream claim")
@@ -101,13 +103,6 @@ func localCmd(cmd *cobra.Command, args []string) {
 		log.Error(err)
 		return
 	}
-	videoID := syncContext.VideoID
-	if videoID == "" {
-		log.Errorf("Only single video mode is supported currently. Please provided a video ID.")
-		return
-	}
-
-	log.Debugf("Running sync for video ID %s", videoID)
 
 	syncDB, err := NewSyncDb(syncContext.SyncDbPath)
 	if err != nil {
@@ -116,17 +111,6 @@ func localCmd(cmd *cobra.Command, args []string) {
 	}
 	defer syncDB.Close()
 
-	isSynced, claimID, err := syncDB.IsVideoPublished("YouTube", videoID)
-	if err != nil {
-		log.Errorf("Error checking if video is already synced: %v", err)
-		return
-	}
-
-	if isSynced {
-		log.Infof("Video %s is already published as %s.", videoID, claimID)
-		return
-	}
-
 	var publisher VideoPublisher
 	publisher, err = NewLocalSDKPublisher(syncContext.LbrynetAddr, syncContext.ChannelID, syncContext.PublishBid)
 	if err != nil {
@@ -136,37 +120,121 @@ func localCmd(cmd *cobra.Command, args []string) {
 
 	var videoSource VideoSource
 	if syncContext.YouTubeSourceConfig != nil {
-		videoSource, err = NewYtdlVideoSource(syncContext.TempDir, syncContext.YouTubeSourceConfig)
+		videoSource, err = NewYtdlVideoSource(syncContext.TempDir, syncContext.YouTubeSourceConfig, syncDB)
 		if err != nil {
 			log.Errorf("Error setting up video source: %v", err)
 			return
 		}
 	}
 
-	err = syncVideo(syncContext, syncDB, videoSource, publisher, videoID)
+	latestPublishedReleaseTime := int64(0)
-	if err != nil {
+	latestKnownReleaseTime := int64(0)
-		log.Errorf("Error syncing %s: %v", videoID, err)
+	if syncContext.ForceChannelScan {
-		return
+		log.Infof("Channel scan is being forced.")
+	} else {
+		dbSummary, err := syncDB.GetSummary()
+		if err != nil {
+			log.Errorf("Error getting sync DB summary for update scan: %v", err)
+			return
+		}
+		latestPublishedReleaseTime = dbSummary.LatestPublished
+		latestKnownReleaseTime = dbSummary.LatestKnown
+	}
+	log.Debugf("Latest known release time: %d", latestKnownReleaseTime)
+	for result := range videoSource.Scan(latestKnownReleaseTime) {
+		if result.Error != nil {
+			log.Errorf("Error while discovering new videos from source: %v", result.Error)
+		} else {
+			syncDB.SaveKnownVideo(*result.Video)
+		}
+	}
+	log.Debugf("Latest published release time: %d", latestPublishedReleaseTime)
+	for result := range publisher.PublishedVideoIterator(latestPublishedReleaseTime) {
+		if result.Error != nil {
+			log.Errorf("Error while discovering published videos: %v", result.Error)
+		} else {
+			syncDB.SavePublishedVideo(*result.Video)
+		}
+	}
+
+	var videoIDs []string
+	if syncContext.VideoID == "" {
+		videoIDs, err = syncDB.GetUnpublishedIDs(videoSource.SourceName())
+		if err != nil {
+			log.Errorf("Error getting unpublished videos from sync DB: %v", err)
+			return
+		}
+	} else {
+		videoIDs = []string{ syncContext.VideoID }
+	}
+	log.Debugf("Syncing videos: %v", videoIDs)
+	for _, videoID := range videoIDs {
+		err = syncVideo(syncContext, syncDB, videoSource, publisher, videoID)
+		if err != nil {
+			log.Errorf("Error syncing %s: %v", videoID, err)
+			return
+		}
 	}
 	log.Info("Done")
 }
 
-func syncVideo(syncContext SyncContext, syncDB *SyncDb, videoSource VideoSource, publisher VideoPublisher, videoID string) error {
+func cacheVideo(syncContext SyncContext, syncDB *SyncDb, videoSource VideoSource, videoID string) (*PublishableVideo, error) {
+	log.Debugf("Ensuring video %s:%s is cached", videoSource.SourceName(), videoID)
+
+	videoRecord, err := syncDB.GetVideoRecord(videoSource.SourceName(), videoID, true, true)
+	if err != nil {
+		log.Errorf("Error checking if video is already cached: %v", err)
+		return nil, err
+	}
+
+	if videoRecord != nil && videoRecord.FullLocalPath.Valid {
+		log.Debugf("%s:%s is already cached.", videoSource.SourceName(), videoID)
+		video := videoRecord.ToPublishableVideo()
+		if video == nil {
+			log.Warnf("%s:%s appears to be cached locally, but has missing data. Caching again.")
+		}
+		return video, nil
+	}
+
+	log.Debugf("%s:%s is not cached locally. Caching now.", videoSource.SourceName(), videoID)
 	sourceVideo, err := videoSource.GetVideo(videoID)
 	if err != nil {
 		log.Errorf("Error getting source video: %v", err)
-		return err
+		return nil, err
-	}
-
-	err = syncDB.SaveVideoData(*sourceVideo)
-	if err != nil {
-		log.Errorf("Error saving video data: %v", err)
-		return err
 	}
 
 	processedVideo, err := processVideoForPublishing(*sourceVideo, syncContext.ChannelID)
 	if err != nil {
 		log.Errorf("Error processing source video for publishing: %v", err)
+		return nil, err
+	}
+
+	err = syncDB.SavePublishableVideo(*processedVideo)
+	if err != nil {
+		log.Errorf("Error saving video data: %v", err)
+		return nil, err
+	}
+
+	return processedVideo, nil
+}
+
+func syncVideo(syncContext SyncContext, syncDB *SyncDb, videoSource VideoSource, publisher VideoPublisher, videoID string) error {
+	log.Debugf("Running sync for video %s:%s", videoSource.SourceName(), videoID)
+
+	isSynced, claimID, err := syncDB.IsVideoPublished(videoSource.SourceName(), videoID)
+	if err != nil {
+		log.Errorf("Error checking if video is already synced: %v", err)
+		return err
+	}
+
+	if isSynced {
+		log.Infof("Video %s:%s is already published as %s.", videoSource.SourceName(), videoID, claimID)
+		return nil
+	}
+
+	processedVideo, err := cacheVideo(syncContext, syncDB, videoSource, videoID)
+	if err != nil {
+		log.Errorf("Error ensuring video is cached prior to publication: %v", err)
 		return err
 	}
 
@@ -181,7 +249,7 @@ func syncVideo(syncContext SyncContext, syncDB *SyncDb, videoSource VideoSource,
 			log.Errorf("Error publishing video: %v", err)
 			return err
 		}
-		err = syncDB.SaveVideoPublication(*processedVideo, claimID)
+		err = syncDB.SavePublishedVideo((*processedVideo).ToPublished(claimID))
 		if err != nil {
 			// Sync DB is corrupted after getting here
 			// and will allow double publication.
@@ -202,6 +270,11 @@ func syncVideo(syncContext SyncContext, syncDB *SyncDb, videoSource VideoSource,
 
 	if !syncContext.KeepCache {
 		log.Infof("Deleting local files.")
+		err = syncDB.MarkVideoUncached(videoSource.SourceName(), videoID)
+		if err != nil {
+			log.Errorf("Error marking video %s:%s as uncached in syncDB", videoSource.SourceName(), videoID)
+			return err
+		}
 		err = videoSource.DeleteLocalCache(videoID)
 		if err != nil {
 			log.Errorf("Error deleting local files for video %s: %v", videoID, err)
@@ -222,7 +295,7 @@ type SourceVideo struct {
 	Tags []string
 	ReleaseTime *int64
 	ThumbnailURL *string
-	FullLocalPath string
+	FullLocalPath *string
 }
 
 type PublishableVideo struct {
@@ -239,7 +312,59 @@ type PublishableVideo struct {
 	FullLocalPath string
 }
 
+func (v PublishableVideo) ToPublished(claimID string) PublishedVideo {
+	return PublishedVideo {
+		ClaimID: claimID,
+		NativeID: v.ID,
+		Source: v.Source,
+		ClaimName: v.ClaimName,
+		Title: v.Title,
+		Description: v.Description,
+		SourceURL: v.SourceURL,
+		Languages: v.Languages,
+		Tags: v.Tags,
+		ReleaseTime: v.ReleaseTime,
+		ThumbnailURL: v.ThumbnailURL,
+		FullLocalPath: v.FullLocalPath,
+	}
+}
+
+type PublishedVideo struct {
+	ClaimID string
+	NativeID string
+	Source string
+	ClaimName string
+	Title string
+	Description string
+	SourceURL string
+	Languages []string
+	Tags []string
+	ReleaseTime int64
+	ThumbnailURL string
+	FullLocalPath string
+}
+
+func (v PublishedVideo) ToPublishable() PublishableVideo {
+	return PublishableVideo {
+		ID: v.NativeID,
+		Source: v.Source,
+		ClaimName: v.ClaimName,
+		Title: v.Title,
+		Description: v.Description,
+		SourceURL: v.SourceURL,
+		Languages: v.Languages,
+		Tags: v.Tags,
+		ReleaseTime: v.ReleaseTime,
+		ThumbnailURL: v.ThumbnailURL,
+		FullLocalPath: v.FullLocalPath,
+	}
+}
+
 func processVideoForPublishing(source SourceVideo, channelID string) (*PublishableVideo, error) {
+	if source.FullLocalPath == nil {
+		return nil, errors.New("Video is not cached locally")
+	}
+
 	tags, err := tags_manager.SanitizeTags(source.Tags, channelID)
 	if err != nil {
 		log.Errorf("Error sanitizing tags: %v", err)
@@ -289,7 +414,7 @@ func processVideoForPublishing(source SourceVideo, channelID string) (*Publishab
 		Tags: tags,
 		ReleaseTime: *releaseTime,
 		ThumbnailURL: *thumbnailURL,
-		FullLocalPath: source.FullLocalPath,
+		FullLocalPath: *source.FullLocalPath,
 	}
 
 	log.Debugf("Video prepared for publication: %v", processed)
@@ -313,10 +438,23 @@ func getAbbrevDescription(v SourceVideo) string {
 }
 
 type VideoSource interface {
+	SourceName() string
 	GetVideo(id string) (*SourceVideo, error)
 	DeleteLocalCache(id string) error
+	Scan(sinceTimestamp int64) <-chan SourceScanIteratorResult
+}
+
+type SourceScanIteratorResult struct {
+	Video *SourceVideo
+	Error error
 }
 
 type VideoPublisher interface {
-	Publish(video PublishableVideo, reflectStream bool) (string, chan error, error)
+	Publish(video PublishableVideo, reflectStream bool) (string, <-chan error, error)
+	PublishedVideoIterator(sinceTimestamp int64) <-chan PublishedVideoIteratorResult
+}
+
+type PublishedVideoIteratorResult struct {
+	Video *PublishedVideo
+	Error error
 }

local/localSDKPublisher.go

@@ -48,7 +48,7 @@ func NewLocalSDKPublisher(sdkAddr, channelID string, publishBid float64) (*Local
 	return &publisher, nil
 }
 
-func (p *LocalSDKPublisher) Publish(video PublishableVideo, reflectStream bool) (string, chan error, error) {
+func (p *LocalSDKPublisher) Publish(video PublishableVideo, reflectStream bool) (string, <-chan error, error) {
 	streamCreateOptions := jsonrpc.StreamCreateOptions {
 		ClaimCreateOptions: jsonrpc.ClaimCreateOptions {
 			Title:        &video.Title,
@@ -116,6 +116,60 @@ func (p *LocalSDKPublisher) Publish(video PublishableVideo, reflectStream bool)
 	return *claimID, done, nil
 }
 
+func (p *LocalSDKPublisher) PublishedVideoIterator(sinceTimestamp int64) <-chan PublishedVideoIteratorResult {
+	videoCh := make(chan PublishedVideoIteratorResult, 10)
+	go func() {
+		defer close(videoCh)
+		for page := uint64(0); ; page++ {
+			streams, err := p.lbrynet.StreamList(nil, page, 100)
+			if err != nil {
+				log.Errorf("Error listing streams (page %d): %v", page, err)
+
+				errResult := PublishedVideoIteratorResult {
+					Error: err,
+				}
+				videoCh <- errResult
+				return
+			}
+			if len(streams.Items) == 0 {
+				return
+			}
+
+			for _, stream := range streams.Items {
+				if stream.ChannelID != p.channelID || stream.Value.GetStream().ReleaseTime < sinceTimestamp {
+					continue
+				}
+
+				languages := []string{}
+				for _, language := range stream.Value.Languages {
+					languages = append(languages, language.String())
+				}
+
+				video := PublishedVideo {
+					ClaimID: stream.ClaimID,
+					NativeID: "",
+					Source: "",
+					ClaimName: stream.Name,
+					Title: stream.Value.Title,
+					Description: stream.Value.Description,
+					Languages: languages,
+					Tags: stream.Value.Tags,
+					ReleaseTime: stream.Value.GetStream().ReleaseTime,
+					ThumbnailURL: stream.Value.Thumbnail.Url,
+					FullLocalPath: "",
+				}
+
+				videoResult := PublishedVideoIteratorResult {
+					Video: &video,
+				}
+				videoCh <- videoResult
+			}
+		}
+	}()
+
+	return videoCh
+}
+
 // if jsonrpc.Client.FileList is extended to match the actual jsonrpc schema, this can be removed
 func findFileByTxid(client *jsonrpc.Client, txid string) (*jsonrpc.FileListResponse, int, error) {
 	response, err := client.FileList(0, 20)

local/syncDb.go

@@ -10,6 +10,14 @@ type SyncDb struct {
 	db *sql.DB
 }
 
+type SyncDbSummary struct {
+	Total int
+	CachedUnpublished int
+	UncachedUnpublished int
+	LatestKnown int64
+	LatestPublished int64
+}
+
 func NewSyncDb(path string) (*SyncDb, error) {
 	db, err := sql.Open("sqlite3", path)
 	if err != nil {
@@ -33,7 +41,157 @@ func (c *SyncDb) Close() error {
 	return c.db.Close()
 }
 
-func (c *SyncDb) SaveVideoData(video SourceVideo) error {
+func (c *SyncDb) SaveKnownVideo(video SourceVideo) error {
+	if video.ID == "" {
+		log.Warnf("Trying to save a video with no ID: %v", video)
+	}
+	insertSql := `
+INSERT INTO videos (
+	source,
+	native_id,
+	title,
+	description,
+	source_url,
+	release_time,
+	thumbnail_url,
+	full_local_path
+) VALUES (?, ?, ?, ?, ?, ?, ?, ?)
+ON CONFLICT (source, native_id)
+DO NOTHING;
+	`
+
+	r := SyncRecordFromSourceVideo(video)
+
+	_, err := c.db.Exec(
+		insertSql,
+		r.Source,
+		r.NativeID,
+		r.Title,
+		r.Description,
+		r.SourceURL,
+		r.ReleaseTime,
+		r.ThumbnailURL,
+		r.FullLocalPath,
+	)
+	return err
+}
+
+func (c *SyncDb) SavePublishableVideo(video PublishableVideo) error {
+	upsertSql := `
+INSERT INTO videos (
+	source,
+	native_id,
+	claim_name,
+	title,
+	description,
+	source_url,
+	release_time,
+	thumbnail_url,
+	full_local_path
+) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)
+ON CONFLICT (source, native_id)
+DO UPDATE SET
+	claim_name = excluded.claim_name,
+	title = excluded.title,
+	description = excluded.description,
+	source_url = excluded.source_url,
+	release_time = excluded.release_time,
+	thumbnail_url = excluded.thumbnail_url,
+	full_local_path = excluded.full_local_path;
+	`
+	_, err := c.db.Exec(
+		upsertSql,
+		video.Source,
+		video.ID,
+		video.ClaimName,
+		video.Title,
+		video.Description,
+		video.SourceURL,
+		video.ReleaseTime,
+		video.ThumbnailURL,
+		video.FullLocalPath,
+	)
+	if err != nil {
+		return err
+	}
+
+
+	err = c.upsertTags(video.Source, video.ID, video.Tags)
+	if err != nil {
+		return err
+	}
+
+	err = c.upsertLanguages(video.Source, video.ID, video.Languages)
+	return err
+}
+
+func (c *SyncDb) SavePublishedVideo(video PublishedVideo) error {
+	upsertSql := `
+INSERT INTO videos (
+	source,
+	native_id,
+	claim_id,
+	claim_name,
+	title,
+	description,
+	source_url,
+	release_time,
+	thumbnail_url,
+	full_local_path
+) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
+ON CONFLICT (source, native_id)
+DO UPDATE SET
+	claim_id = excluded.claim_id,
+	claim_name = excluded.claim_name,
+	title = excluded.title,
+	description = excluded.description,
+	source_url = excluded.source_url,
+	release_time = excluded.release_time,
+	thumbnail_url = excluded.thumbnail_url,
+	full_local_path = excluded.full_local_path;
+	`
+	_, err := c.db.Exec(
+		upsertSql,
+		video.Source,
+		video.NativeID,
+		video.ClaimID,
+		video.ClaimName,
+		video.Title,
+		video.Description,
+		video.SourceURL,
+		video.ReleaseTime,
+		video.ThumbnailURL,
+		video.FullLocalPath,
+	)
+	if err != nil {
+		return err
+	}
+
+
+	err = c.upsertTags(video.Source, video.NativeID, video.Tags)
+	if err != nil {
+		return err
+	}
+
+	err = c.upsertLanguages(video.Source, video.NativeID, video.Languages)
+	return err
+}
+
+func (c *SyncDb) MarkVideoUncached(source, id string) error {
+	updateSql := `
+UPDATE videos
+SET full_local_path = NULL
+WHERE source = ? AND native_id = ?;
+	`
+	_, err := c.db.Exec(
+		updateSql,
+		source,
+		id,
+	)
+	return err
+}
+
+func (c *SyncDb) _SaveVideoData(video SourceVideo) error {
 	upsertSql := `
 INSERT INTO videos (
 	source,
@@ -152,7 +310,33 @@ WHERE source = ? AND native_id = ?
 	}
 }
 
-func (c *SyncDb) GetSavedVideoData(source, id string) (*SourceVideo, *string, error) {
+func (c *SyncDb) IsVideoCached(source, id string) (bool, string, error) {
+	selectSql := `
+SELECT
+	full_local_path
+FROM videos
+WHERE source = ? AND native_id = ?
+	`
+	row := c.db.QueryRow(selectSql, source, id)
+
+	var localPath sql.NullString
+	err := row.Scan(&localPath)
+
+	if err == sql.ErrNoRows {
+		return false, "", nil
+	} else if err != nil {
+		log.Errorf("Error querying video cache status for %s:%s from sync DB: %v", source, id, err)
+		return false, "", err
+	}
+
+	if localPath.Valid {
+		return true, localPath.String, nil
+	} else {
+		return false, "", nil
+	}
+}
+
+func (c *SyncDb) GetVideoRecord(source, id string, includeTags, includeLanguages bool) (*SyncRecord, error) {
 	selectSql := `
 SELECT
 	native_id,
@@ -168,40 +352,107 @@ WHERE source = ? AND native_id = ?
 	`
 	row := c.db.QueryRow(selectSql, source, id)
 
-	var record syncRecord
+	var record SyncRecord
 	err := row.Scan(
-		&record.nativeID,
+		&record.NativeID,
-		&record.title,
+		&record.Title,
-		&record.description,
+		&record.Description,
-		&record.sourceURL,
+		&record.SourceURL,
-		&record.releaseTime,
+		&record.ReleaseTime,
-		&record.thumbnailURL,
+		&record.ThumbnailURL,
-		&record.fullLocalPath,
+		&record.FullLocalPath,
-		&record.claimID,
+		&record.ClaimID,
 	)
 	if err == sql.ErrNoRows {
-		log.Debugf("Data for YouTube:%s is not in the sync DB", id)
+		log.Debugf("Data for %s:%s is not in the sync DB", source, id)
-		return nil, nil, nil
+		return nil, nil
 	} else if err != nil {
 		log.Errorf("Error querying video data for %s:%s from sync DB: %v", source, id, err)
-		return nil, nil, err
+		return nil, err
 	}
-	sourceVideo, claimID := record.toSourceVideo()
 
-	tags, err := c.getTags(source, id)
+	if includeTags {
+		tags, err := c.getTags(source, id)
+		if err != nil {
+			return nil, err
+		}
+		record.Tags = &tags
+	}
+
+	if includeLanguages {
+		languages, err := c.getLanguages(source, id)
+		if err != nil {
+			return nil, err
+		}
+		record.Languages = &languages
+	}
+
+	return &record, nil
+}
+
+func (c *SyncDb) GetUnpublishedIDs(source string) ([]string, error) {
+	selectSql := `
+SELECT
+	native_id
+FROM videos
+WHERE source = ? AND claim_id IS NULL
+	`
+	ids := []string{}
+
+	rows, err := c.db.Query(selectSql, source)
 	if err != nil {
-		return nil, nil, err
+		return ids, err
+	}
+	defer rows.Close()
+
+	for rows.Next() {
+		var id string
+		err = rows.Scan(&id)
+		if err != nil {
+			return ids, err
+		}
+		ids = append(ids, id)
 	}
 
-	languages, err := c.getLanguages(source, id)
+	return ids, nil
+}
+
+func (c *SyncDb) GetSummary() (*SyncDbSummary, error) {
+	selectSql := `
+SELECT
+	COUNT() AS total,
+	COUNT(v_unpub.full_local_path) AS cached_unpublished,
+	COUNT(v_all.claim_id) - COUNT(v_unpub.full_local_path) AS uncached_unpublished,
+	MAX(v_all.release_time) AS latest_known,
+	MAX(v_pub.release_time) AS latest_published
+FROM videos v_all
+LEFT JOIN videos v_pub ON v_all.source = v_pub.source AND v_all.native_id = v_pub.native_id AND v_pub.claim_id IS NOT NULL
+LEFT JOIN videos v_unpub ON v_all.source = v_unpub.source AND v_all.native_id = v_unpub.native_id AND v_unpub.claim_id IS NULL
+	`
+	row := c.db.QueryRow(selectSql)
+
+	var summary SyncDbSummary
+	var latestKnown, latestPublished sql.NullInt64
+	err := row.Scan(
+		&summary.Total,
+		&summary.CachedUnpublished,
+		&summary.UncachedUnpublished,
+		&latestKnown,
+		&latestPublished,
+	)
 	if err != nil {
-		return nil, nil, err
+		log.Errorf("Error querying sync DB summary: %v", err)
+		return nil, err
 	}
 
-	sourceVideo.Tags = tags
+	if latestKnown.Valid {
-	sourceVideo.Languages = languages
+		summary.LatestKnown = latestKnown.Int64
+	}
+	if latestPublished.Valid {
+		summary.LatestPublished = latestPublished.Int64
+	}
 
-	return &sourceVideo, claimID, nil
+	return &summary, nil
 }
 
 func (c *SyncDb) ensureSchema() error {
@@ -215,6 +466,7 @@ CREATE TABLE IF NOT EXISTS videos (
 	release_time INT,
 	thumbnail_url TEXT,
 	full_local_path TEXT,
+	claim_name TEXT,
 	claim_id TEXT,
 	PRIMARY KEY (source, native_id)
 );
@@ -343,53 +595,82 @@ WHERE source = ? AND native_id = ?;
 	return languages, nil
 }
 
-type syncRecord struct {
+type SyncRecord struct {
-	source string
+	Source string
-	nativeID string
+	NativeID string
-	title sql.NullString
+	Title sql.NullString
-	description sql.NullString
+	Description sql.NullString
-	sourceURL string
+	SourceURL sql.NullString
-	releaseTime sql.NullInt64
+	ReleaseTime sql.NullInt64
-	thumbnailURL sql.NullString
+	ThumbnailURL sql.NullString
-	fullLocalPath string
+	FullLocalPath sql.NullString
-	claimID sql.NullString
+	ClaimID sql.NullString
+	Tags *[]string
+	Languages *[]string
 }
 
-func (r *syncRecord) toSourceVideo() (SourceVideo, *string) {
+func SyncRecordFromSourceVideo(v SourceVideo) SyncRecord {
-	video := SourceVideo {
+	r := SyncRecord {
-		ID: r.nativeID,
+		Source: v.Source,
-		Source: r.source,
+		NativeID: v.ID,
-		SourceURL: r.sourceURL,
+		SourceURL: sql.NullString { String: v.SourceURL, Valid: true },
-		FullLocalPath: r.fullLocalPath,
 	}
 
-	if r.title.Valid {
+	if v.Title != nil {
-		video.Title = &r.title.String
+		r.Title = sql.NullString { String: *v.Title, Valid: true }
-	} else {
-		video.Title = nil
 	}
 
-	if r.description.Valid {
+	if v.Description != nil {
-		video.Description = &r.description.String
+		r.Description = sql.NullString { String: *v.Description, Valid: true }
-	} else {
-		video.Description = nil
 	}
 
-	if r.releaseTime.Valid {
+	if v.ThumbnailURL != nil {
-		video.ReleaseTime = &r.releaseTime.Int64
+		r.ThumbnailURL = sql.NullString { String: *v.ThumbnailURL, Valid: true }
-	} else {
-		video.ReleaseTime = nil
 	}
 
-	if r.thumbnailURL.Valid {
+	if v.FullLocalPath != nil {
-		video.ThumbnailURL = &r.thumbnailURL.String
+		r.FullLocalPath = sql.NullString { String: *v.FullLocalPath, Valid: true }
-	} else {
-		video.ThumbnailURL = nil
 	}
 
-	if r.claimID.Valid {
+	if v.ReleaseTime != nil {
-		return video, &r.claimID.String
+		r.ReleaseTime = sql.NullInt64 { Int64: *v.ReleaseTime, Valid: true }
-	} else {
-		return video, nil
 	}
+
+	if len(v.Tags) > 0 {
+		r.Tags = &v.Tags
+	}
+
+	if len(v.Languages) > 0 {
+		r.Languages = &v.Languages
+	}
+
+	return r
+}
+
+func (r *SyncRecord) ToPublishableVideo() *PublishableVideo {
+	if !(r.Title.Valid &&
+		r.Description.Valid &&
+		r.SourceURL.Valid &&
+		r.ReleaseTime.Valid &&
+		r.ThumbnailURL.Valid &&
+		r.FullLocalPath.Valid &&
+		r.Tags != nil &&
+		r.Languages != nil) {
+
+		return nil
+	}
+
+	video := PublishableVideo {
+		ID: r.NativeID,
+		Source: r.Source,
+		Description: r.Description.String,
+		SourceURL: r.SourceURL.String,
+		ReleaseTime: r.ReleaseTime.Int64,
+		ThumbnailURL: r.ThumbnailURL.String,
+		FullLocalPath: r.FullLocalPath.String,
+		Tags: *r.Tags,
+		Languages: *r.Languages,
+	}
+
+	return &video
 }

local/youtubeChannelScanner.go

@@ -0,0 +1,51 @@
+package local
+
+type YouTubeChannelScanner interface {
+	Scan(sinceTimestamp int64) <-chan SourceScanIteratorResult
+}
+
+type YouTubeAPIChannelScanner struct {
+	api *YouTubeAPI
+	channel string
+}
+
+func NewYouTubeAPIChannelScanner(apiKey, channel string) (*YouTubeAPIChannelScanner) {
+	scanner := YouTubeAPIChannelScanner {
+		api: NewYouTubeAPI(apiKey),
+		channel: channel,
+	}
+	return &scanner
+}
+
+func (s *YouTubeAPIChannelScanner) Scan(sinceTimestamp int64) <-chan SourceScanIteratorResult {
+	videoCh := make(chan SourceScanIteratorResult, 10)
+	go func() {
+		defer close(videoCh)
+
+		for firstRun, nextPage := true, ""; firstRun || nextPage != ""; {
+			var videos []SourceVideo
+			var err error
+
+			firstRun = false
+
+			videos, nextPage, err = s.api.GetChannelVideosPage(s.channel, sinceTimestamp, nextPage)
+			if err != nil {
+				videoCh <- SourceScanIteratorResult {
+					Video: nil,
+					Error: err,
+				}
+				return
+			}
+
+			for _, video := range videos {
+				outVideo := video
+				videoCh <- SourceScanIteratorResult {
+					Video: &outVideo,
+					Error: nil,
+				}
+			}
+		}
+	}()
+
+	return videoCh
+}

local/youtubeEnricher.go

@@ -43,3 +43,32 @@ func (e *YouTubeAPIVideoEnricher) EnrichMissing(source *SourceVideo) error {
 	}
 	return nil
 }
+
+type CacheVideoEnricher struct {
+	syncDB *SyncDb
+}
+
+func NewCacheVideoEnricher(syncDB *SyncDb) *CacheVideoEnricher {
+	enricher := CacheVideoEnricher {
+		syncDB,
+	}
+	return &enricher
+}
+
+func (e *CacheVideoEnricher) EnrichMissing(source *SourceVideo) error {
+	if source.ReleaseTime != nil {
+		log.Debugf("Video %s does not need enrichment. YouTubeAPIVideoEnricher is skipping.", source.ID)
+		return nil
+	}
+
+	cached, err := e.syncDB.GetVideoRecord(source.Source, source.ID, false, false)
+	if err != nil {
+		log.Errorf("Error getting cached video %s: %v", source.ID, err)
+		return err
+	}
+
+	if cached != nil && cached.ReleaseTime.Valid {
+		source.ReleaseTime = &cached.ReleaseTime.Int64
+	}
+	return nil
+}

local/ytapi.go

@@ -8,6 +8,8 @@ import (
 	"time"
 
 	log "github.com/sirupsen/logrus"
+
+	"github.com/lbryio/lbry.go/v2/extras/util"
 )
 
 type YouTubeAPI struct {
@@ -72,8 +74,80 @@ func (a *YouTubeAPI) GetVideoSnippet(videoID string) (*VideoSnippet, error) {
 	return &result.Items[0].Snippet, nil
 }
 
+func (a *YouTubeAPI) GetChannelVideosPage(channelID string, publishedAfter int64, pageToken string) ([]SourceVideo, string, error) {
+	req, err := http.NewRequest("GET", "https://youtube.googleapis.com/youtube/v3/search", nil)
+	if err != nil {
+		log.Errorf("Error creating http client for YouTube API: %v", err)
+		return []SourceVideo{}, "", err
+	}
+
+	query := req.URL.Query()
+	query.Add("part", "snippet")
+	query.Add("type", "video")
+	query.Add("channelId", channelID)
+	query.Add("publishedAfter", time.Unix(publishedAfter, 0).Format(time.RFC3339))
+	query.Add("maxResults", "5")
+	if pageToken != "" {
+		query.Add("pageToken", pageToken)
+	}
+	query.Add("key", a.apiKey)
+	req.URL.RawQuery = query.Encode()
+
+	req.Header.Add("Accept", "application/json")
+
+	resp, err := a.client.Do(req)
+	defer resp.Body.Close()
+	if err != nil {
+		log.Errorf("Error from YouTube API: %v", err)
+		return []SourceVideo{}, "", err
+	}
+
+	body, err := io.ReadAll(resp.Body)
+	log.Tracef("Response from YouTube API: %s", string(body[:]))
+
+	var result videoSearchResponse
+	err = json.Unmarshal(body, &result)
+	if err != nil {
+		log.Errorf("Error deserializing video list response from YouTube API: %v", err)
+		return []SourceVideo{}, "", err
+	}
+
+	videos := []SourceVideo{}
+	for _, item := range result.Items {
+		var releaseTime *int64
+		publishedAt, err := time.Parse(time.RFC3339, item.Snippet.PublishedAt)
+		if err != nil {
+			log.Errorf("Unable to parse publish time of %s while scanning YouTube channel %s: %v", item.ID.VideoID, channelID)
+			releaseTime = nil
+		} else {
+			releaseTime = util.PtrToInt64(publishedAt.Unix())
+		}
+
+		video := SourceVideo {
+			ID: item.ID.VideoID,
+			Source: "YouTube",
+			ReleaseTime: releaseTime,
+		}
+		videos = append(videos, video)
+	}
+
+	return videos, result.NextPageToken, nil
+}
+
 type videoListResponse struct {
+	NextPageToken string `json:"nextPageToken"`
 	Items []struct {
+		ID string `json:"id"`
+		Snippet VideoSnippet `json:"snippet"`
+	} `json:"items"`
+}
+
+type videoSearchResponse struct {
+	NextPageToken string `json:"nextPageToken"`
+	Items []struct {
+		ID struct{
+			VideoID string `json:"videoId"`
+		} `json:"id"`
 		Snippet VideoSnippet `json:"snippet"`
 	} `json:"items"`
 }

local/ytdlVideoSource.go

@@ -8,10 +8,11 @@ import (
 
 type YtdlVideoSource struct {
 	downloader Ytdl
+	channelScanner YouTubeChannelScanner
 	enrichers []YouTubeVideoEnricher
 }
 
-func NewYtdlVideoSource(downloadDir string, config *YouTubeSourceConfig) (*YtdlVideoSource, error) {
+func NewYtdlVideoSource(downloadDir string, config *YouTubeSourceConfig, syncDB *SyncDb) (*YtdlVideoSource, error) {
 	ytdl, err := NewYtdl(downloadDir)
 	if err != nil {
 		return nil, err
@@ -21,14 +22,27 @@ func NewYtdlVideoSource(downloadDir string, config *YouTubeSourceConfig) (*YtdlV
 		downloader: *ytdl,
 	}
 
+	if syncDB != nil {
+		source.enrichers = append(source.enrichers, NewCacheVideoEnricher(syncDB))
+	}
+
 	if config.APIKey != "" {
 		ytapiEnricher := NewYouTubeAPIVideoEnricher(config.APIKey)
 		source.enrichers = append(source.enrichers, ytapiEnricher)
+		source.channelScanner = NewYouTubeAPIChannelScanner(config.APIKey, config.ChannelID)
+	}
+
+	if source.channelScanner == nil {
+		log.Warnf("No means of scanning source channels has been provided")
 	}
 
 	return &source, nil
 }
 
+func (s *YtdlVideoSource) SourceName() string {
+	return "YouTube"
+}
+
 func (s *YtdlVideoSource) GetVideo(id string) (*SourceVideo, error) {
 	metadata, err := s.downloader.GetVideoMetadata(id)
 	if err != nil {
@@ -57,7 +71,7 @@ func (s *YtdlVideoSource) GetVideo(id string) (*SourceVideo, error) {
 		Tags: metadata.Tags,
 		ReleaseTime: nil,
 		ThumbnailURL: &bestThumbnail.URL,
-		FullLocalPath: videoPath,
+		FullLocalPath: &videoPath,
 	}
 
 	for _, enricher := range s.enrichers {
@@ -75,3 +89,13 @@ func (s *YtdlVideoSource) GetVideo(id string) (*SourceVideo, error) {
 func (s *YtdlVideoSource) DeleteLocalCache(id string) error {
 	return s.downloader.DeleteVideoFiles(id)
 }
+
+func (s *YtdlVideoSource) Scan(sinceTimestamp int64) <-chan SourceScanIteratorResult {
+	if s.channelScanner != nil {
+		return s.channelScanner.Scan(sinceTimestamp)
+	}
+
+	videoCh := make(chan SourceScanIteratorResult, 1)
+	close(videoCh)
+	return videoCh
+}