Attempt to upload accumulated files at exit

main.go

@@ -136,6 +136,13 @@ func run(ctx context.Context, args runArgs) error {
 	defer ln.Close()
 
 	srv := &server{dir: args.Dir, ch: make(chan json.RawMessage, 1000), wake: make(chan struct{})}
+	defer func() {
+		c, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+		defer cancel()
+		if err := srv.uploadOnce(c, args.Bucket, args.Prefix, upl); err != nil {
+			log.Printf("final upload attempt: %v", err)
+		}
+	}()
 	group, ctx := errgroup.WithContext(ctx)
 	group.Go(func() error { <-ctx.Done(); return ln.Close() })
 	group.Go(func() error { return srv.ingest(ctx, args.Mb<<20, args.D) })
@@ -172,6 +179,21 @@ type server struct {
 }
 
 func (srv *server) upload(ctx context.Context, d time.Duration, bucket, prefix string, upl *manager.Uploader) error {
+	ticker := time.NewTicker(d)
+	defer ticker.Stop()
+	for {
+		select {
+		case <-ctx.Done():
+			return nil
+		case <-ticker.C:
+			_ = srv.uploadOnce(ctx, bucket, prefix, upl)
+		case <-srv.wake:
+			_ = srv.uploadOnce(ctx, bucket, prefix, upl)
+		}
+	}
+}
+
+func (srv *server) uploadOnce(ctx context.Context, bucket, prefix string, upl *manager.Uploader) error {
 	walkFn := func(path string, d fs.DirEntry, err error) error {
 		if err != nil || d.IsDir() || !strings.HasSuffix(path, ".json.gz") {
 			return nil
@@ -191,18 +213,7 @@ func (srv *server) upload(ctx context.Context, d time.Duration, bucket, prefix s
 		}
 		return nil
 	}
-	ticker := time.NewTicker(d)
-	defer ticker.Stop()
-	for {
-		select {
-		case <-ctx.Done():
-			return nil
-		case <-ticker.C:
-			_ = filepath.WalkDir(srv.dir, walkFn)
-		case <-srv.wake:
-			_ = filepath.WalkDir(srv.dir, walkFn)
-		}
-	}
+	return filepath.WalkDir(srv.dir, walkFn)
 }
 
 func uploadFile(ctx context.Context, upl *manager.Uploader, bucket, prefix, name string) error {