go.mod

@@ -22,6 +22,7 @@ require (
 	github.com/kr/pretty v0.2.1 // indirect
 	github.com/lbryio/lbry.go/v2 v2.7.2-0.20210824154606-3e18b74da08b
 	github.com/lbryio/reflector.go v1.1.3-0.20210412225256-4392c9724262
+	github.com/mattn/go-sqlite3 v1.10.0
 	github.com/miekg/dns v1.1.22 // indirect
 	github.com/mitchellh/go-ps v0.0.0-20190716172923-621e5597135b
 	github.com/opencontainers/go-digest v1.0.0-rc1 // indirect

go.sum

@@ -318,6 +318,7 @@ github.com/mattn/go-colorable v0.0.9/go.mod h1:9vuHe8Xs5qXnSaW/c/ABM9alt+Vo+STaO
 github.com/mattn/go-isatty v0.0.3/go.mod h1:M+lRXTBqGeGNdLjl/ufCoiOlB5xdOkqRJdNxMWT7Zi4=
 github.com/mattn/go-runewidth v0.0.13 h1:lTGmDsbAYt5DmK6OnoV7EuIF1wEIFAcxld6ypU4OSgU=
 github.com/mattn/go-runewidth v0.0.13/go.mod h1:Jdepj2loyihRzMpdS35Xk/zdY8IAYHsh153qUoGf23w=
+github.com/mattn/go-sqlite3 v1.10.0 h1:jbhqpg7tQe4SupckyijYiy0mJJ/pRyHvXf7JdWK860o=
 github.com/mattn/go-sqlite3 v1.10.0/go.mod h1:FPy6KqzDD04eiIsT53CuJW3U88zkxoIYsOqkbpncsNc=
 github.com/matttproud/golang_protobuf_extensions v1.0.1 h1:4hp9jkHxhMHkqkrB3Ix0jegS5sx/RkqARlsWZ6pIwiU=
 github.com/matttproud/golang_protobuf_extensions v1.0.1/go.mod h1:D8He9yQNgCq6Z5Ld7szi9bcBfOoFv/3dc6xSMkL2PC0=

local/local.go

@@ -1,22 +1,460 @@
 package local
 
 import (
-	"fmt"
+	"errors"
+	"os"
+	"regexp"
+	"strings"
+	"time"
 
+	log "github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
+	"github.com/abadojack/whatlanggo"
+
+	"github.com/lbryio/lbry.go/v2/extras/util"
+	"github.com/lbryio/ytsync/v5/namer"
+	"github.com/lbryio/ytsync/v5/tags_manager"
 )
 
+type SyncContext struct {
+	DryRun              bool
+	KeepCache           bool
+	ReflectStreams      bool
+	ForceChannelScan    bool
+	TempDir             string
+	SyncDbPath          string
+	LbrynetAddr         string
+	ChannelID           string
+	VideoID             string
+	PublishBid          float64
+	YouTubeSourceConfig *YouTubeSourceConfig
+}
+
+func (c *SyncContext) Validate() error {
+	if c.TempDir == "" {
+		return errors.New("No TempDir provided")
+	}
+	if c.SyncDbPath == "" {
+		return errors.New("No sync DB path provided")
+	}
+	if c.LbrynetAddr == "" {
+		return errors.New("No Lbrynet address provided")
+	}
+	if c.ChannelID == "" {
+		return errors.New("No channel ID provided")
+	}
+	if c.PublishBid <= 0.0 {
+		return errors.New("Publish bid is not greater than zero")
+	}
+
+	if c.YouTubeSourceConfig.ChannelID != "" {
+		// Validate for YouTube source
+		// For now, an API key is required
+		if c.YouTubeSourceConfig.APIKey == "" {
+			return errors.New("YouTube source was selected, but no YouTube API key was provided.")
+		}
+	} else {
+		return errors.New("No video source provided")
+	}
+	return nil
+}
+
+type YouTubeSourceConfig struct {
+	ChannelID string
+	APIKey string
+}
+
+var syncContext SyncContext
+
 func AddCommand(rootCmd *cobra.Command) {
 	cmd := &cobra.Command{
 		Use:   "local",
 		Short: "run a personal ytsync",
 		Run:   localCmd,
+		Args:  cobra.ExactArgs(0),
 	}
-	//cmd.Flags().StringVar(&cache, "cache", "", "path to cache")
+	cmd.Flags().BoolVar(&syncContext.DryRun, "dry-run", false, "Display information about the stream publishing, but do not publish the stream")
-	rootCmd.AddCommand(cmd)
+	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")
+	cmd.Flags().StringVar(&syncContext.LbrynetAddr, "lbrynet-address", getEnvDefault("LBRYNET_ADDRESS", ""), "JSONRPC address of the local LBRYNet daemon")
+	cmd.Flags().StringVar(&syncContext.ChannelID, "channel-id", "", "LBRY channel ID to publish to")
+	cmd.Flags().StringVar(&syncContext.VideoID, "video-id", "", "ID of video to sync. This will attempt to sync only this one video.")
 
+	syncContext.YouTubeSourceConfig = &YouTubeSourceConfig{}
+	cmd.Flags().StringVar(&syncContext.YouTubeSourceConfig.APIKey, "youtube-api-key", getEnvDefault("YOUTUBE_API_KEY", ""), "YouTube API Key")
+	cmd.Flags().StringVar(&syncContext.YouTubeSourceConfig.ChannelID, "youtube-channel", "", "YouTube Channel ID")
+	rootCmd.AddCommand(cmd)
+}
+
+func getEnvDefault(key, defaultValue string) string {
+	if value, ok := os.LookupEnv(key); ok {
+		return value
+	}
+	return defaultValue
 }
 
 func localCmd(cmd *cobra.Command, args []string) {
-	fmt.Println("local")
+	err := syncContext.Validate()
+	if err != nil {
+		log.Error(err)
+		return
+	}
+
+	syncDB, err := NewSyncDb(syncContext.SyncDbPath)
+	if err != nil {
+		log.Errorf("Error creating sync DB: %v", err)
+		return
+	}
+	defer syncDB.Close()
+
+	var publisher VideoPublisher
+	publisher, err = NewLocalSDKPublisher(syncContext.LbrynetAddr, syncContext.ChannelID, syncContext.PublishBid)
+	if err != nil {
+		log.Errorf("Error setting up publisher: %v", err)
+		return
+	}
+
+	var videoSource VideoSource
+	if syncContext.YouTubeSourceConfig != nil {
+		videoSource, err = NewYtdlVideoSource(syncContext.TempDir, syncContext.YouTubeSourceConfig, syncDB)
+		if err != nil {
+			log.Errorf("Error setting up video source: %v", err)
+			return
+		}
+	}
+
+	latestPublishedReleaseTime := int64(0)
+	latestKnownReleaseTime := int64(0)
+	if syncContext.ForceChannelScan {
+		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 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 nil, 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
+	}
+
+	if syncContext.DryRun {
+		log.Infoln("This is a dry run. Nothing will be published.")
+		log.Infof("The local file %s would be published to channel ID %s as %s.", processedVideo.FullLocalPath, syncContext.ChannelID, processedVideo.ClaimName)
+		log.Debugf("Object to be published: %v", processedVideo)
+
+	} else {
+		claimID, doneReflectingCh, err := publisher.Publish(*processedVideo, syncContext.ReflectStreams)
+		if err != nil {
+			log.Errorf("Error publishing video: %v", err)
+			return err
+		}
+		err = syncDB.SavePublishedVideo((*processedVideo).ToPublished(claimID))
+		if err != nil {
+			// Sync DB is corrupted after getting here
+			// and will allow double publication.
+			log.Errorf("Error saving video publication to sync DB: %v", err)
+			return err
+		}
+
+		if syncContext.ReflectStreams {
+			err = <-doneReflectingCh
+			if err != nil {
+				log.Errorf("Error while wating for stream to reflect: %v", err)
+				return err
+			}
+		} else {
+			log.Debugln("Not waiting for stream to reflect.")
+		}
+	}
+
+	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)
+			return err
+		}
+	}
+
+	return nil
+}
+
+type SourceVideo struct {
+	ID string
+	Source string
+	Title *string
+	Description *string
+	SourceURL string
+	Languages []string
+	Tags []string
+	ReleaseTime *int64
+	ThumbnailURL *string
+	FullLocalPath *string
+}
+
+type PublishableVideo struct {
+	ID string
+	Source string
+	ClaimName string
+	Title string
+	Description string
+	SourceURL string
+	Languages []string
+	Tags []string
+	ReleaseTime int64
+	ThumbnailURL string
+	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)
+		return nil, err
+	}
+
+	descriptionSample := ""
+	if source.Description != nil {
+		urlsRegex := regexp.MustCompile(`(?m) ?(f|ht)(tp)(s?)(://)(.*)[.|/](.*)`)
+		descriptionSample = urlsRegex.ReplaceAllString(*source.Description, "")
+	}
+	info := whatlanggo.Detect(descriptionSample)
+
+	title := ""
+	if source.Title != nil {
+		title = *source.Title
+	}
+	info2 := whatlanggo.Detect(title)
+	var languages []string = nil
+	if info.IsReliable() && info.Lang.Iso6391() != "" {
+		language := info.Lang.Iso6391()
+		languages = []string{language}
+	} else if info2.IsReliable() && info2.Lang.Iso6391() != "" {
+		language := info2.Lang.Iso6391()
+		languages = []string{language}
+	}
+
+	claimName := namer.NewNamer().GetNextName(title)
+
+	thumbnailURL := source.ThumbnailURL
+	if thumbnailURL == nil {
+		thumbnailURL = util.PtrToString("")
+	}
+
+	releaseTime := source.ReleaseTime
+	if releaseTime == nil {
+		releaseTime = util.PtrToInt64(time.Now().Unix())
+	}
+
+	processed := PublishableVideo {
+		ID: source.ID,
+		Source: source.Source,
+		ClaimName: claimName,
+		Title: title,
+		Description:  getAbbrevDescription(source),
+		Languages: languages,
+		Tags: tags,
+		ReleaseTime: *releaseTime,
+		ThumbnailURL: *thumbnailURL,
+		FullLocalPath: *source.FullLocalPath,
+	}
+
+	log.Debugf("Video prepared for publication: %v", processed)
+
+	return &processed, nil
+}
+
+func getAbbrevDescription(v SourceVideo) string {
+	if v.Description == nil {
+		return v.SourceURL
+	}
+
+	additionalDescription := "\n...\n" + v.SourceURL
+	maxLength := 2800 - len(additionalDescription)
+
+	description := strings.TrimSpace(*v.Description)
+	if len(description) > maxLength {
+		description = description[:maxLength]
+	}
+	return description + additionalDescription
+}
+
+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)
+	PublishedVideoIterator(sinceTimestamp int64) <-chan PublishedVideoIteratorResult
+}
+
+type PublishedVideoIteratorResult struct {
+	Video *PublishedVideo
+	Error error
 }

local/localSDKPublisher.go

@@ -0,0 +1,190 @@
+package local
+
+import (
+	"errors"
+	"sort"
+	"time"
+
+	log "github.com/sirupsen/logrus"
+
+	"github.com/lbryio/lbry.go/v2/extras/jsonrpc"
+	"github.com/lbryio/lbry.go/v2/extras/util"
+)
+
+type LocalSDKPublisher struct {
+	channelID string
+	publishBid float64
+	lbrynet *jsonrpc.Client
+}
+
+func NewLocalSDKPublisher(sdkAddr, channelID string, publishBid float64) (*LocalSDKPublisher, error) {
+	lbrynet := jsonrpc.NewClient(sdkAddr)
+	lbrynet.SetRPCTimeout(5 * time.Minute)
+
+	status, err := lbrynet.Status()
+	if err != nil {
+		return nil, err
+	}
+
+	if !status.IsRunning {
+		return nil, errors.New("SDK is not running")
+	}
+
+	// Should check to see if the SDK owns the channel
+
+	// Should check to see if wallet is unlocked
+	// but jsonrpc.Client doesn't have WalletStatus method
+	// so skip for now
+
+	// Should check to see if streams are configured to be reflected and warn if not
+	// but jsonrpc.Client doesn't have SettingsGet method to see if streams are reflected
+	// so use File.UploadingToReflector as a proxy for now
+
+	publisher := LocalSDKPublisher {
+		channelID: channelID,
+		publishBid: publishBid,
+		lbrynet: lbrynet,
+	}
+	return &publisher, nil
+}
+
+func (p *LocalSDKPublisher) Publish(video PublishableVideo, reflectStream bool) (string, <-chan error, error) {
+	streamCreateOptions := jsonrpc.StreamCreateOptions {
+		ClaimCreateOptions: jsonrpc.ClaimCreateOptions {
+			Title:        &video.Title,
+			Description:  &video.Description,
+			Languages:    video.Languages,
+			ThumbnailURL: &video.ThumbnailURL,
+			Tags:         video.Tags,
+		},
+		ReleaseTime: &video.ReleaseTime,
+		ChannelID:   &p.channelID,
+		License:     util.PtrToString("Copyrighted (contact publisher)"),
+	}
+
+	txSummary, err := p.lbrynet.StreamCreate(video.ClaimName, video.FullLocalPath, p.publishBid, streamCreateOptions)
+	if err != nil {
+		return "", nil, err
+	}
+
+	var claimID *string
+	for _, output := range txSummary.Outputs {
+		if output.Type == "claim" {
+			claimID = &output.ClaimID
+			break
+		}
+	}
+	if claimID == nil {
+		return "", nil, errors.New("Publish transaction did not have a claim output.")
+	}
+
+	if !reflectStream {
+		return "", nil, nil
+	}
+
+	done := make(chan error, 1)
+	go func() {
+		for {
+			fileListResponse, fileIndex, err := findFileByTxid(p.lbrynet, txSummary.Txid)
+			if err != nil {
+				log.Errorf("Error finding file by txid: %v", err)
+				done <- err
+				return
+			}
+			if fileListResponse == nil {
+				log.Errorf("Could not find file in list with correct txid")
+				done <- err
+				return
+			}
+
+			fileStatus := fileListResponse.Items[fileIndex]
+			if fileStatus.IsFullyReflected {
+				log.Info("Stream is fully reflected")
+				break
+			}
+			if !fileStatus.UploadingToReflector {
+				log.Error("Stream is not being uploaded to a reflector. Check your lbrynet settings if this is a mistake.")
+				done <- errors.New("Stream is not being reflected (check lbrynet settings).")
+				return
+			}
+			log.Infof("Stream reflector progress: %d%%", fileStatus.ReflectorProgress)
+			time.Sleep(5 * time.Second)
+		}
+		done <- nil
+	}()
+
+	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)
+	for {
+		if err != nil {
+			log.Errorf("Error getting file list page: %v", err)
+			return nil, 0, err
+		}
+		index := sort.Search(len(response.Items), func (i int) bool { return response.Items[i].Txid == txid })
+		if index < len(response.Items) {
+			return response, index, nil
+		}
+		if response.Page >= response.TotalPages {
+			return nil, 0, nil
+		}
+		response, err = client.FileList(response.Page + 1, 20)
+	}
+}

local/readme.md

@@ -5,6 +5,7 @@
 - LBRY SDK (what do we actually need this for?)
 - youtube-dl
 - enough space to cache stuff
+- YouTube data API key
 
 
 ## Process
@@ -15,6 +16,21 @@
   - or easier, just error if no channel 
 - enough lbc in wallet?
 
+### Getting a YouTube API key
+
+To access the YouTube data API, you will first need some kind of google account.
+
+The API has two methods of authentication, OAuth2 and API keys. This application uses API keys.
+These API keys are basically like passwords, and so once obtained, they should not be shared.
+
+The instructions for obtaining an API key are copied below from [here](https://developers.google.com/youtube/registering_an_application):
+
+
+1. Open the [Credentials page](https://console.developers.google.com/apis/credentials) in the API Console.
+2. Create an API key in the Console by clicking **Create credentials > API key**. You can restrict the key before using it in production by clicking **Restrict key** and selecting one of the **Restrictions**.
+
+To keep your API keys secure, follow the [best practices for securely using API keys](https://cloud.google.com/docs/authentication/api-keys).
+
 ### Options to figure out what's already synced
 
 - simplest: assume nothing is synced yet
@@ -50,4 +66,4 @@
 
 ### Debugging
 
-- dry-running the whole thing
+- dry-running the whole thing

local/syncDb.go

@@ -0,0 +1,676 @@
+package local
+
+import (
+	"database/sql"
+	_ "github.com/mattn/go-sqlite3"
+	log "github.com/sirupsen/logrus"
+)
+
+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 {
+		log.Errorf("Error opening cache DB at %s: %v", path, err)
+		return nil, err
+	}
+
+	cache := SyncDb {
+		db: db,
+	}
+	err = cache.ensureSchema()
+	if err != nil {
+		log.Errorf("Error while ensuring sync DB structure: %v", err)
+		return nil, err
+	}
+
+	return &cache, nil
+}
+
+func (c *SyncDb) Close() error {
+	return c.db.Close()
+}
+
+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,
+	native_id,
+	title,
+	description,
+	source_url,
+	release_time,
+	thumbnail_url,
+	full_local_path
+) VALUES (?, ?, ?, ?, ?, ?, ?, ?)
+ON CONFLICT (source, native_id)
+DO UPDATE SET
+	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.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) SaveVideoPublication(video PublishableVideo, claimID string) error {
+	upsertSql := `
+INSERT INTO videos (
+	source,
+	native_id,
+	title,
+	description,
+	source_url,
+	release_time,
+	thumbnail_url,
+	full_local_path,
+	claim_id
+) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)
+ON CONFLICT (source, native_id)
+DO UPDATE SET
+	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,
+	claim_id = excluded.claim_id;
+	`
+	_, err := c.db.Exec(
+		upsertSql,
+		video.Source,
+		video.ID,
+		video.Title,
+		video.Description,
+		video.SourceURL,
+		video.ReleaseTime,
+		video.ThumbnailURL,
+		video.FullLocalPath,
+		claimID,
+	)
+	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) IsVideoPublished(source, id string) (bool, string, error) {
+	selectSql := `
+SELECT
+	claim_id
+FROM videos
+WHERE source = ? AND native_id = ?
+	`
+	row := c.db.QueryRow(selectSql, source, id)
+
+	var claimID sql.NullString
+	err := row.Scan(&claimID)
+
+	if err == sql.ErrNoRows {
+		return false, "", nil
+	} else if err != nil {
+		log.Errorf("Error querying video publication for %s:%s from sync DB: %v", source, id, err)
+		return false, "", err
+	}
+
+	if claimID.Valid {
+		return true, claimID.String, nil
+	} else {
+		return false, "", nil
+	}
+}
+
+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,
+	title,
+	description,
+	source_url,
+	release_time,
+	thumbnail_url,
+	full_local_path,
+	claim_id
+FROM videos
+WHERE source = ? AND native_id = ?
+	`
+	row := c.db.QueryRow(selectSql, source, id)
+
+	var record SyncRecord
+	err := row.Scan(
+		&record.NativeID,
+		&record.Title,
+		&record.Description,
+		&record.SourceURL,
+		&record.ReleaseTime,
+		&record.ThumbnailURL,
+		&record.FullLocalPath,
+		&record.ClaimID,
+	)
+	if err == sql.ErrNoRows {
+		log.Debugf("Data for %s:%s is not in the sync DB", source, id)
+		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, err
+	}
+
+	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 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)
+	}
+
+	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 {
+		log.Errorf("Error querying sync DB summary: %v", err)
+		return nil, err
+	}
+
+	if latestKnown.Valid {
+		summary.LatestKnown = latestKnown.Int64
+	}
+	if latestPublished.Valid {
+		summary.LatestPublished = latestPublished.Int64
+	}
+
+	return &summary, nil
+}
+
+func (c *SyncDb) ensureSchema() error {
+	createSql := `
+CREATE TABLE IF NOT EXISTS videos (
+	source TEXT,
+	native_id TEXT,
+	title TEXT,
+	description TEXT,
+	source_url TEXT,
+	release_time INT,
+	thumbnail_url TEXT,
+	full_local_path TEXT,
+	claim_name TEXT,
+	claim_id TEXT,
+	PRIMARY KEY (source, native_id)
+);
+CREATE TABLE IF NOT EXISTS video_tags (
+	source TEXT NOT NULL,
+	native_id TEXT NOT NULL,
+	tag TEXT NOT NULL,
+	UNIQUE (source, native_id, tag)
+);
+CREATE TABLE IF NOT EXISTS video_languages (
+	source TEXT NOT NULL,
+	native_id TEXT NOT NULL,
+	language TEXT NOT NULL,
+	UNIQUE (source, native_id, language)
+);
+	`
+	_, err := c.db.Exec(createSql)
+	return err
+}
+
+func (c *SyncDb) upsertTags(source, id string, tags []string) error {
+	upsertSql := `
+INSERT INTO video_tags (
+	source,
+	native_id,
+	tag
+) VALUES (?, ?, ?)
+ON CONFLICT (source, native_id, tag)
+DO NOTHING;
+	`
+
+	for _, tag := range tags {
+		_, err := c.db.Exec(
+			upsertSql,
+			source,
+			id,
+			tag,
+		)
+		if err != nil {
+			log.Errorf("Error inserting tag %s into sync DB for %s:%s: %v", tag, source, id, err)
+			return err
+		}
+	}
+	return nil
+}
+
+func (c *SyncDb) getTags(source, id string) ([]string, error) {
+	selectSql := `
+SELECT tag
+FROM video_tags
+WHERE source = ? AND native_id = ?;
+	`
+
+	rows, err := c.db.Query(selectSql, source, id)
+	if err != nil {
+		log.Errorf("Error getting tags from sync DB for %s:%s: %v", source, id, err)
+		return nil, err
+	}
+	defer rows.Close()
+
+	var tags []string
+	for rows.Next() {
+		var tag string
+		err = rows.Scan(&tag)
+		if err != nil {
+			log.Error("Error deserializing tag from sync DB for %s:%s: %v", source, id, err)
+			return nil, err
+		}
+		tags = append(tags, tag)
+	}
+
+	return tags, nil
+}
+
+func (c *SyncDb) upsertLanguages(source, id string, languages []string) error {
+	upsertSql := `
+INSERT INTO video_languages (
+	source,
+	native_id,
+	language
+) VALUES (?, ?, ?)
+ON CONFLICT (source, native_id, language)
+DO NOTHING;
+	`
+
+	for _, language := range languages {
+		_, err := c.db.Exec(
+			upsertSql,
+			source,
+			id,
+			language,
+		)
+		if err != nil {
+			log.Errorf("Error inserting language %s into sync DB for %s:%s: %v", language, source, id, err)
+			return err
+		}
+	}
+	return nil
+}
+
+func (c *SyncDb) getLanguages(source, id string) ([]string, error) {
+	selectSql := `
+SELECT language
+FROM video_languages
+WHERE source = ? AND native_id = ?;
+	`
+
+	rows, err := c.db.Query(selectSql, source, id)
+	if err != nil {
+		log.Errorf("Error getting languages from sync DB for %s:%s: %v", source, id, err)
+		return nil, err
+	}
+	defer rows.Close()
+
+	var languages []string
+	for rows.Next() {
+		var language string
+		err = rows.Scan(&language)
+		if err != nil {
+			log.Error("Error deserializing language from sync DB for %s:%s: %v", source, id, err)
+			return nil, err
+		}
+		languages = append(languages, language)
+	}
+
+	return languages, nil
+}
+
+type SyncRecord struct {
+	Source string
+	NativeID string
+	Title sql.NullString
+	Description sql.NullString
+	SourceURL sql.NullString
+	ReleaseTime sql.NullInt64
+	ThumbnailURL sql.NullString
+	FullLocalPath sql.NullString
+	ClaimID sql.NullString
+	Tags *[]string
+	Languages *[]string
+}
+
+func SyncRecordFromSourceVideo(v SourceVideo) SyncRecord {
+	r := SyncRecord {
+		Source: v.Source,
+		NativeID: v.ID,
+		SourceURL: sql.NullString { String: v.SourceURL, Valid: true },
+	}
+
+	if v.Title != nil {
+		r.Title = sql.NullString { String: *v.Title, Valid: true }
+	}
+
+	if v.Description != nil {
+		r.Description = sql.NullString { String: *v.Description, Valid: true }
+	}
+
+	if v.ThumbnailURL != nil {
+		r.ThumbnailURL = sql.NullString { String: *v.ThumbnailURL, Valid: true }
+	}
+
+	if v.FullLocalPath != nil {
+		r.FullLocalPath = sql.NullString { String: *v.FullLocalPath, Valid: true }
+	}
+
+	if v.ReleaseTime != nil {
+		r.ReleaseTime = sql.NullInt64 { Int64: *v.ReleaseTime, Valid: true }
+	}
+
+	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

@@ -0,0 +1,74 @@
+package local
+
+import (
+	"time"
+
+	log "github.com/sirupsen/logrus"
+
+	"github.com/lbryio/lbry.go/v2/extras/util"
+)
+
+type YouTubeVideoEnricher interface {
+	EnrichMissing(source *SourceVideo) error
+}
+
+type YouTubeAPIVideoEnricher struct {
+	api *YouTubeAPI
+}
+
+func NewYouTubeAPIVideoEnricher(apiKey string) (*YouTubeAPIVideoEnricher) {
+	enricher := YouTubeAPIVideoEnricher{
+		api: NewYouTubeAPI(apiKey),
+	}
+	return &enricher
+}
+
+func (e *YouTubeAPIVideoEnricher) EnrichMissing(source *SourceVideo) error {
+	if source.ReleaseTime != nil {
+		log.Debugf("Video %s does not need enrichment. YouTubeAPIVideoEnricher is skipping.", source.ID)
+		return nil
+	}
+
+	snippet, err := e.api.GetVideoSnippet(source.ID)
+	if err != nil {
+		log.Errorf("Error snippet data for video %s: %v", err)
+		return err
+	}
+
+	publishedAt, err := time.Parse(time.RFC3339, snippet.PublishedAt)
+	if err != nil {
+		log.Errorf("Error converting publishedAt to timestamp: %v", err)
+	} else {
+		source.ReleaseTime = util.PtrToInt64(publishedAt.Unix())
+	}
+	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

@@ -0,0 +1,157 @@
+package local
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"time"
+
+	log "github.com/sirupsen/logrus"
+
+	"github.com/lbryio/lbry.go/v2/extras/util"
+)
+
+type YouTubeAPI struct {
+	apiKey string
+	client *http.Client
+}
+
+func NewYouTubeAPI(apiKey string) (*YouTubeAPI) {
+	client := &http.Client {
+		Transport: &http.Transport{
+			MaxIdleConns:       10,
+			IdleConnTimeout:    30 * time.Second,
+			DisableCompression: true,
+		},
+	}
+
+	api := YouTubeAPI {
+		apiKey: apiKey,
+		client: client,
+	}
+
+	return &api
+}
+
+func (a *YouTubeAPI) GetVideoSnippet(videoID string) (*VideoSnippet, error) {
+	req, err := http.NewRequest("GET", "https://youtube.googleapis.com/youtube/v3/videos", nil)
+	if err != nil {
+		log.Errorf("Error creating http client for YouTube API: %v", err)
+		return nil, err
+	}
+
+	query := req.URL.Query()
+	query.Add("part", "snippet")
+	query.Add("id", videoID)
+	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 nil, err
+	}
+
+	body, err := io.ReadAll(resp.Body)
+	log.Tracef("Response from YouTube API: %s", string(body[:]))
+
+	var result videoListResponse
+	err = json.Unmarshal(body, &result)
+	if err != nil {
+		log.Errorf("Error deserializing video list response from YouTube API: %v", err)
+		return nil, err
+	}
+
+	if len(result.Items) != 1 {
+		err = fmt.Errorf("YouTube API responded with incorrect number of snippets (%d) while attempting to get snippet data for video %s", len(result.Items), videoID)
+		return nil, err
+	}
+
+	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"`
+}
+
+type VideoSnippet struct {
+	PublishedAt string `json:"publishedAt"`
+}

local/ytdl.go

@@ -0,0 +1,239 @@
+package local
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"os/exec"
+	"path"
+	"strings"
+
+	log "github.com/sirupsen/logrus"
+
+	"github.com/lbryio/ytsync/v5/downloader/ytdl"
+)
+
+type Ytdl struct {
+	DownloadDir string
+}
+
+func NewYtdl(downloadDir string) (*Ytdl, error) {
+	// TODO validate download dir
+
+	y := Ytdl {
+		DownloadDir: downloadDir,
+	}
+
+	return &y, nil
+}
+
+func (y *Ytdl) GetVideoMetadata(videoID string) (*ytdl.YtdlVideo, error) {
+	metadataPath, err := y.GetVideoMetadataFile(videoID)
+	if err != nil {
+		return nil, err
+	}
+
+	metadataBytes, err := os.ReadFile(metadataPath)
+	if err != nil {
+		return nil, err
+	}
+
+	var metadata *ytdl.YtdlVideo
+	err = json.Unmarshal(metadataBytes, &metadata)
+	if err != nil {
+		return nil, err
+	}
+
+	return metadata, nil
+}
+
+
+func (y *Ytdl) GetVideoMetadataFile(videoID string) (string, error) {
+	basePath := path.Join(y.DownloadDir, videoID)
+	metadataPath := basePath + ".info.json"
+
+	_, err := os.Stat(metadataPath)
+	if err != nil && !os.IsNotExist(err) {
+		log.Errorf("Error determining if video metadata already exists: %v", err)
+		return "", err
+	} else if err != nil {
+		log.Debugf("Metadata file for video %s does not exist. Downloading now.", videoID)
+		err = downloadVideoMetadata(basePath, videoID)
+		if err != nil {
+			return "", err
+		}
+	}
+
+	return metadataPath, nil
+}
+
+func (y *Ytdl) GetVideoFile(videoID string) (string, error) {
+	videoPath, err := findDownloadedVideo(y.DownloadDir, videoID)
+	if err != nil {
+		return "", err
+	}
+
+	if videoPath != nil {
+		return *videoPath, nil
+	}
+
+	basePath := path.Join(y.DownloadDir, videoID)
+	metadataPath, err := y.GetVideoMetadataFile(videoID)
+	if err != nil {
+		log.Errorf("Error getting metadata path in preparation for video download: %v", err)
+		return "", err
+	}
+	err = downloadVideo(basePath, metadataPath)
+	if err != nil {
+		return "", nil
+	}
+
+	videoPath, err = findDownloadedVideo(y.DownloadDir, videoID)
+	if err != nil {
+		log.Errorf("Error from findDownloadedVideo() after already succeeding once: %v", err)
+		return "", err
+	}
+	if videoPath == nil {
+		return "", errors.New("Could not find a downloaded video after successful download.")
+	}
+
+	return *videoPath, nil
+}
+
+func (y *Ytdl) DeleteVideoFiles(videoID string) error {
+	files, err := ioutil.ReadDir(y.DownloadDir)
+	if err != nil {
+		return err
+	}
+
+	for _, f := range files {
+		if f.IsDir() {
+			continue
+		}
+		if strings.Contains(f.Name(), videoID) {
+			videoPath := path.Join(y.DownloadDir, f.Name())
+			err = os.Remove(videoPath)
+			if err != nil {
+				log.Errorf("Error while deleting file %s: %v", y.DownloadDir, err)
+				return err
+			}
+		}
+	}
+
+	return nil
+}
+
+func deleteFile(path string) error {
+	_, err := os.Stat(path)
+	if err != nil && !os.IsNotExist(err) {
+		log.Errorf("Error determining if file %s exists: %v", path, err)
+		return err
+	} else if err != nil {
+		log.Debugf("File %s does not exist. Skipping deletion.", path)
+		return nil
+	}
+
+	return os.Remove(path)
+}
+
+func findDownloadedVideo(videoDir, videoID string) (*string, error) {
+	files, err := ioutil.ReadDir(videoDir)
+	if err != nil {
+		return nil, err
+	}
+
+	for _, f := range files {
+		if f.IsDir() {
+			continue
+		}
+		if path.Ext(f.Name()) == ".mp4" && strings.Contains(f.Name(), videoID) {
+			videoPath := path.Join(videoDir, f.Name())
+			return &videoPath, nil
+		}
+	}
+	return nil, nil
+}
+
+func downloadVideoMetadata(basePath, videoID string) error {
+	ytdlArgs := []string{
+		"--skip-download",
+		"--write-info-json",
+		"--force-overwrites",
+		fmt.Sprintf("https://www.youtube.com/watch?v=%s", videoID),
+		"--cookies",
+		"cookies.txt",
+		"-o",
+		basePath,
+	}
+	ytdlCmd := exec.Command("yt-dlp", ytdlArgs...)
+	output, err := runCmd(ytdlCmd)
+	log.Debug(output)
+	return err
+}
+
+func downloadVideo(basePath, metadataPath string) error {
+	ytdlArgs := []string{
+		"--no-progress",
+		"-o",
+		basePath,
+		"--merge-output-format",
+		"mp4",
+		"--postprocessor-args",
+		"ffmpeg:-movflags faststart",
+		"--abort-on-unavailable-fragment",
+		"--fragment-retries",
+		"1",
+		"--cookies",
+		"cookies.txt",
+		"--extractor-args",
+		"youtube:player_client=android",
+		"--load-info-json",
+		metadataPath,
+		"-fbestvideo[ext=mp4][vcodec!*=av01][height<=720]+bestaudio[ext!=webm][format_id!=258][format_id!=251][format_id!=256][format_id!=327]",
+	}
+
+	ytdlCmd := exec.Command("yt-dlp", ytdlArgs...)
+	output, err := runCmd(ytdlCmd)
+	log.Debug(output)
+	return err
+}
+
+func runCmd(cmd *exec.Cmd) ([]string, error) {
+	log.Infof("running cmd: %s", strings.Join(cmd.Args, " "))
+	var err error
+	stderr, err := cmd.StderrPipe()
+	if err != nil {
+		return nil, err
+	}
+	stdout, err := cmd.StdoutPipe()
+	if err != nil {
+		return nil, err
+	}
+	err = cmd.Start()
+	if err != nil {
+		return nil, err
+	}
+	outLog, err := ioutil.ReadAll(stdout)
+	if err != nil {
+		return nil, err
+	}
+	errorLog, err := ioutil.ReadAll(stderr)
+	if err != nil {
+		return nil, err
+	}
+	done := make(chan error, 1)
+	go func() {
+		done <- cmd.Wait()
+	}()
+
+	select {
+	case err := <-done:
+		if err != nil {
+			log.Error(string(errorLog))
+			return nil, err
+		}
+		return strings.Split(strings.Replace(string(outLog), "\r\n", "\n", -1), "\n"), nil
+	}
+}

local/ytdlVideoSource.go

@@ -0,0 +1,101 @@
+package local
+
+import (
+	log "github.com/sirupsen/logrus"
+
+	"github.com/lbryio/ytsync/v5/downloader/ytdl"
+)
+
+type YtdlVideoSource struct {
+	downloader Ytdl
+	channelScanner YouTubeChannelScanner
+	enrichers []YouTubeVideoEnricher
+}
+
+func NewYtdlVideoSource(downloadDir string, config *YouTubeSourceConfig, syncDB *SyncDb) (*YtdlVideoSource, error) {
+	ytdl, err := NewYtdl(downloadDir)
+	if err != nil {
+		return nil, err
+	}
+
+	source := YtdlVideoSource {
+		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 {
+		return nil, err
+	}
+
+	videoPath, err := s.downloader.GetVideoFile(id)
+	if err != nil {
+		return nil, err
+	}
+
+	var bestThumbnail *ytdl.Thumbnail = nil
+	for i, thumbnail := range metadata.Thumbnails {
+		if i == 0 || bestThumbnail.Width < thumbnail.Width {
+			bestThumbnail = &thumbnail
+		}
+	}
+
+	sourceVideo := SourceVideo {
+		ID: id,
+		Source: "YouTube",
+		Title: &metadata.Title,
+		Description: &metadata.Description,
+		SourceURL: "\nhttps://www.youtube.com/watch?v=" + id,
+		Languages: []string{},
+		Tags: metadata.Tags,
+		ReleaseTime: nil,
+		ThumbnailURL: &bestThumbnail.URL,
+		FullLocalPath: &videoPath,
+	}
+
+	for _, enricher := range s.enrichers {
+		err = enricher.EnrichMissing(&sourceVideo)
+		if err != nil {
+			log.Warnf("Error enriching video %s, continuing enrichment: %v", id, err)
+		}
+	}
+
+	log.Debugf("Source video retrieved via ytdl: %v", sourceVideo)
+
+	return &sourceVideo, nil
+}
+
+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
+}