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Merge pull request #64 from moul/dev/moul/processing-worker
feat: processing worker
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,136 @@ | ||
| package sgtm | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "os" | ||
| "sync" | ||
| "time" | ||
|
|
||
| "go.uber.org/zap" | ||
| "gorm.io/gorm" | ||
| "moul.io/banner" | ||
| "moul.io/sgtm/pkg/sgtmpb" | ||
| ) | ||
|
|
||
| type processingWorkerDriver struct { | ||
| started bool | ||
| wg *sync.WaitGroup | ||
|
|
||
| trackMigrations []func(*sgtmpb.Post) error | ||
| } | ||
|
|
||
| func (svc *Service) StartProcessingWorker() error { | ||
| // init | ||
| { | ||
| fmt.Fprintln(os.Stderr, banner.Inline("processing-worker")) | ||
| svc.logger.Debug("starting processing-worker") | ||
| svc.setupMigrations() | ||
| svc.processingWorker.wg = &sync.WaitGroup{} | ||
| svc.processingWorker.wg.Add(1) | ||
| defer svc.processingWorker.wg.Done() | ||
| svc.processingWorker.started = true | ||
| } | ||
|
|
||
| // loop | ||
| for i := 0; ; i++ { | ||
| if err := svc.processingLoop(i); err != nil { | ||
| return err | ||
| } | ||
|
|
||
| select { | ||
| // FIXME: add a channel to get instant worker task | ||
| case <-time.After(30 * time.Second): | ||
| case <-svc.ctx.Done(): | ||
| return nil | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func (svc *Service) CloseProcessingWorker(err error) { | ||
| svc.logger.Debug("closing processingWorker", zap.Bool("was-started", svc.processingWorker.started), zap.Error(err)) | ||
| svc.cancel() | ||
| if svc.processingWorker.started { | ||
| svc.processingWorker.wg.Wait() | ||
| svc.logger.Debug("processing-worker closed") | ||
| } | ||
| } | ||
|
|
||
| func (svc *Service) processingLoop(i int) error { | ||
| before := time.Now() | ||
|
|
||
| // track migrations | ||
| { | ||
| var outdated []*sgtmpb.Post | ||
| err := svc.rodb(). | ||
| Where(sgtmpb.Post{Kind: sgtmpb.Post_TrackKind}). | ||
| Where("processing_error IS NULL OR processing_error == ''"). | ||
| Where("processing_version IS NULL OR processing_version < ?", len(svc.processingWorker.trackMigrations)). | ||
| Preload("Author"). | ||
| Find(&outdated). | ||
| Error | ||
| if err != nil { | ||
| return fmt.Errorf("failed to fetch tracks that need to be processed: %w", err) | ||
| } | ||
|
|
||
| err = svc.rwdb().Transaction(func(db *gorm.DB) error { | ||
| for _, entryPtr := range outdated { | ||
| entry := entryPtr | ||
| version := 1 | ||
| for _, migration := range svc.processingWorker.trackMigrations { | ||
| err := migration(entry) | ||
| if err != nil { | ||
| entry.ProcessingError = err.Error() | ||
| break | ||
| } | ||
| entry.ProcessingVersion = int64(version) | ||
| version++ | ||
| } | ||
| if err := db. | ||
| Model(&entry). | ||
| Updates(map[string]interface{}{ | ||
| "processing_version": entry.ProcessingVersion, | ||
| "processing_error": entry.ProcessingError, | ||
| }). | ||
| Error; err != nil { | ||
| return fmt.Errorf("failed to save processing state: %w", err) | ||
| } | ||
| } | ||
| return nil | ||
| }) | ||
| if err != nil { | ||
| return fmt.Errorf("failed to run migration: %w", err) | ||
| } | ||
| } | ||
|
|
||
| // TODO: other type migrations | ||
| // TODO: track maintenance (i.e., daily check if the track still exists on SoundCloud) | ||
|
|
||
| svc.logger.Debug("processing loop ended", | ||
| zap.Duration("duration", time.Since(before)), | ||
| zap.Int("loop", i), | ||
| ) | ||
| return nil | ||
| } | ||
|
|
||
| func (svc *Service) setupMigrations() { | ||
| svc.processingWorker.trackMigrations = []func(*sgtmpb.Post) error{ | ||
| /* | ||
| // FIXME: try downloading the mp3 locally | ||
| func(post *sgtmpb.Post) error { return fmt.Errorf("not implemented") }, | ||
| // FIXME: compute BPM | ||
| func(post *sgtmpb.Post) error { return fmt.Errorf("not implemented") }, | ||
| // FIXME: extract thumbnail from file metadata | ||
| func(post *sgtmpb.Post) error { return fmt.Errorf("not implemented") }, | ||
| // FIXME: compute other info with analysis tools | ||
| func(post *sgtmpb.Post) error { return fmt.Errorf("not implemented") }, | ||
| // FIXME: create MP3 version for uploaded WAV | ||
| func(post *sgtmpb.Post) error { | ||
| if post.Provider != sgtmpb.Provider_IPFS { | ||
| return nil | ||
| } | ||
| // if post.mp3_192_cid == "" && format != mp3 { download; compress; upload } | ||
| return nil | ||
| }, | ||
| */ | ||
| } | ||
| } |
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