forked from mxpv/podsync
/
updater.go
412 lines (341 loc) · 10.6 KB
/
updater.go
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package main
import (
"bytes"
"context"
"fmt"
"io"
"os"
"regexp"
"sort"
"time"
"github.com/hashicorp/go-multierror"
"github.com/pkg/errors"
log "github.com/sirupsen/logrus"
"github.com/dop251/podsync/pkg/builder"
"github.com/dop251/podsync/pkg/db"
"github.com/dop251/podsync/pkg/feed"
"github.com/dop251/podsync/pkg/fs"
"github.com/dop251/podsync/pkg/model"
"github.com/dop251/podsync/pkg/ytdl"
)
type Downloader interface {
Download(ctx context.Context, feedConfig *feed.Config, episode *model.Episode) (io.ReadCloser, error)
}
type Updater struct {
config *Config
downloader Downloader
db db.Storage
fs fs.Storage
keys map[model.Provider]feed.KeyProvider
}
func NewUpdater(config *Config, downloader Downloader, db db.Storage, fs fs.Storage) (*Updater, error) {
keys := map[model.Provider]feed.KeyProvider{}
for name, list := range config.Tokens {
provider, err := feed.NewKeyProvider(list)
if err != nil {
return nil, errors.Wrapf(err, "failed to create key provider for %q", name)
}
keys[name] = provider
}
return &Updater{
config: config,
downloader: downloader,
db: db,
fs: fs,
keys: keys,
}, nil
}
func (u *Updater) Update(ctx context.Context, feedConfig *feed.Config) error {
log.WithFields(log.Fields{
"feed_id": feedConfig.ID,
"format": feedConfig.Format,
"quality": feedConfig.Quality,
}).Infof("-> updating %s", feedConfig.URL)
started := time.Now()
if err := u.updateFeed(ctx, feedConfig); err != nil {
return errors.Wrap(err, "update failed")
}
if err := u.downloadEpisodes(ctx, feedConfig); err != nil {
return errors.Wrap(err, "download failed")
}
if err := u.buildXML(ctx, feedConfig); err != nil {
return errors.Wrap(err, "xml build failed")
}
if err := u.buildOPML(ctx); err != nil {
return errors.Wrap(err, "opml build failed")
}
if err := u.cleanup(ctx, feedConfig); err != nil {
log.WithError(err).Error("cleanup failed")
}
elapsed := time.Since(started)
log.Infof("successfully updated feed in %s", elapsed)
return nil
}
// updateFeed pulls API for new episodes and saves them to database
func (u *Updater) updateFeed(ctx context.Context, feedConfig *feed.Config) error {
info, err := builder.ParseURL(feedConfig.URL)
if err != nil {
return errors.Wrapf(err, "failed to parse URL: %s", feedConfig.URL)
}
keyProvider, ok := u.keys[info.Provider]
if !ok {
return errors.Errorf("key provider %q not loaded", info.Provider)
}
// Create an updater for this feed type
provider, err := builder.New(ctx, info.Provider, keyProvider.Get())
if err != nil {
return err
}
// Query API to get episodes
log.Debug("building feed")
result, err := provider.Build(ctx, feedConfig)
if err != nil {
return err
}
log.Debugf("received %d episode(s) for %q", len(result.Episodes), result.Title)
episodeSet := make(map[string]struct{})
if err := u.db.WalkEpisodes(ctx, feedConfig.ID, func(episode *model.Episode) error {
if episode.Status != model.EpisodeDownloaded && episode.Status != model.EpisodeCleaned {
episodeSet[episode.ID] = struct{}{}
}
return nil
}); err != nil {
return err
}
if err := u.db.AddFeed(ctx, feedConfig.ID, result); err != nil {
return err
}
for _, episode := range result.Episodes {
delete(episodeSet, episode.ID)
}
// removing episodes that are no longer available in the feed and not downloaded or cleaned
for id := range episodeSet {
log.Infof("removing episode %q", id)
err := u.db.DeleteEpisode(feedConfig.ID, id)
if err != nil {
return err
}
}
log.Debug("successfully saved updates to storage")
return nil
}
func (u *Updater) matchRegexpFilter(pattern, str string, negative bool, logger log.FieldLogger) bool {
if pattern != "" {
matched, err := regexp.MatchString(pattern, str)
if err != nil {
logger.Warnf("pattern %q is not a valid")
} else {
if matched == negative {
logger.Infof("skipping due to mismatch")
return false
}
}
}
return true
}
func (u *Updater) matchFilters(episode *model.Episode, filters *feed.Filters) bool {
logger := log.WithFields(log.Fields{"episode_id": episode.ID})
if !u.matchRegexpFilter(filters.Title, episode.Title, false, logger.WithField("filter", "title")) {
return false
}
if !u.matchRegexpFilter(filters.NotTitle, episode.Title, true, logger.WithField("filter", "not_title")) {
return false
}
if !u.matchRegexpFilter(filters.Description, episode.Description, false, logger.WithField("filter", "description")) {
return false
}
if !u.matchRegexpFilter(filters.NotDescription, episode.Description, true, logger.WithField("filter", "not_description")) {
return false
}
return true
}
func (u *Updater) downloadEpisodes(ctx context.Context, feedConfig *feed.Config) error {
var (
feedID = feedConfig.ID
downloadList []*model.Episode
pageSize = feedConfig.PageSize
)
log.WithField("page_size", pageSize).Info("downloading episodes")
// Build the list of files to download
if err := u.db.WalkEpisodes(ctx, feedID, func(episode *model.Episode) error {
if episode.Status != model.EpisodeNew && episode.Status != model.EpisodeError {
// File already downloaded
return nil
}
if !u.matchFilters(episode, &feedConfig.Filters) {
return nil
}
// Limit the number of episodes downloaded at once
pageSize--
if pageSize < 0 {
return nil
}
log.Debugf("adding %s (%q) to queue", episode.ID, episode.Title)
downloadList = append(downloadList, episode)
return nil
}); err != nil {
return errors.Wrapf(err, "failed to build update list")
}
var (
downloadCount = len(downloadList)
downloaded = 0
)
if downloadCount > 0 {
log.Infof("download count: %d", downloadCount)
} else {
log.Info("no episodes to download")
return nil
}
// Download pending episodes
for idx, episode := range downloadList {
var (
logger = log.WithFields(log.Fields{"index": idx, "episode_id": episode.ID})
episodeName = feed.EpisodeName(feedConfig, episode)
)
// Check whether episode already exists
size, err := fs.Size(u.fs, fmt.Sprintf("%s/%s", feedID, episodeName))
if err == nil {
logger.Infof("episode %q already exists on disk", episode.ID)
// File already exists, update file status and disk size
if err := u.db.UpdateEpisode(feedID, episode.ID, func(episode *model.Episode) error {
episode.Size = size
episode.Status = model.EpisodeDownloaded
return nil
}); err != nil {
logger.WithError(err).Error("failed to update file info")
return err
}
continue
} else if os.IsNotExist(err) {
// Will download, do nothing here
} else {
logger.WithError(err).Error("failed to stat file")
return err
}
// Download episode to disk
// We download the episode to a temp directory first to avoid downloading this file by clients
// while still being processed by youtube-dl (e.g. a file is being downloaded from YT or encoding in progress)
logger.Infof("! downloading episode %s", episode.VideoURL)
tempFile, err := u.downloader.Download(ctx, feedConfig, episode)
if err != nil {
// YouTube might block host with HTTP Error 429: Too Many Requests
// We still need to generate XML, so just stop sending download requests and
// retry next time
if err == ytdl.ErrTooManyRequests {
logger.Warn("server responded with a 'Too Many Requests' error")
break
}
if err := u.db.UpdateEpisode(feedID, episode.ID, func(episode *model.Episode) error {
episode.Status = model.EpisodeError
return nil
}); err != nil {
return err
}
continue
}
logger.Debug("copying file")
fileSize, err := u.fs.Create(ctx, fmt.Sprintf("%s/%s", feedID, episodeName), tempFile)
tempFile.Close()
if err != nil {
logger.WithError(err).Error("failed to copy file")
return err
}
// Update file status in database
logger.Infof("successfully downloaded file %q", episode.ID)
if err := u.db.UpdateEpisode(feedID, episode.ID, func(episode *model.Episode) error {
episode.Size = fileSize
episode.Status = model.EpisodeDownloaded
return nil
}); err != nil {
return err
}
downloaded++
}
log.Infof("downloaded %d episode(s)", downloaded)
return nil
}
func (u *Updater) buildXML(ctx context.Context, feedConfig *feed.Config) error {
f, err := u.db.GetFeed(ctx, feedConfig.ID)
if err != nil {
return err
}
// Build iTunes XML feed with data received from builder
log.Debug("building iTunes podcast feed")
podcast, err := feed.Build(ctx, f, feedConfig, u.config.Server.Hostname)
if err != nil {
return err
}
var (
reader = bytes.NewReader([]byte(podcast.String()))
xmlName = fmt.Sprintf("%s.xml", feedConfig.ID)
)
if _, err := u.fs.Create(ctx, xmlName, reader); err != nil {
return errors.Wrap(err, "failed to upload new XML feed")
}
return nil
}
func (u *Updater) buildOPML(ctx context.Context) error {
// Build OPML with data received from builder
log.Debug("building podcast OPML")
opml, err := feed.BuildOPML(ctx, u.config.Feeds, u.db, u.config.Server.Hostname)
if err != nil {
return err
}
var (
reader = bytes.NewReader([]byte(opml))
xmlName = fmt.Sprintf("%s.opml", "podsync")
)
if _, err := u.fs.Create(ctx, xmlName, reader); err != nil {
return errors.Wrap(err, "failed to upload OPML")
}
return nil
}
func (u *Updater) cleanup(ctx context.Context, feedConfig *feed.Config) error {
var (
feedID = feedConfig.ID
logger = log.WithField("feed_id", feedID)
count = feedConfig.Clean.KeepLast
list []*model.Episode
result *multierror.Error
)
if count < 1 {
logger.Info("nothing to clean")
return nil
}
logger.WithField("count", count).Info("running cleaner")
if err := u.db.WalkEpisodes(ctx, feedConfig.ID, func(episode *model.Episode) error {
if episode.Status == model.EpisodeDownloaded {
list = append(list, episode)
}
return nil
}); err != nil {
return err
}
if count > len(list) {
return nil
}
sort.Slice(list, func(i, j int) bool {
return list[i].PubDate.After(list[j].PubDate)
})
for _, episode := range list[count:] {
logger.WithField("episode_id", episode.ID).Infof("deleting %q", episode.Title)
var (
episodeName = feed.EpisodeName(feedConfig, episode)
path = fmt.Sprintf("%s/%s", feedConfig.ID, episodeName)
)
if err := u.fs.Delete(ctx, path); err != nil {
result = multierror.Append(result, errors.Wrapf(err, "failed to delete episode: %s", episode.ID))
continue
}
if err := u.db.UpdateEpisode(feedID, episode.ID, func(episode *model.Episode) error {
episode.Status = model.EpisodeCleaned
episode.Title = ""
episode.Description = ""
return nil
}); err != nil {
result = multierror.Append(result, errors.Wrapf(err, "failed to set state for cleaned episode: %s", episode.ID))
continue
}
}
return result.ErrorOrNil()
}