gistfile1.txt

func (s *SidecarAPI) Shutdown(r *http.Request) (interface{}, []error, *api.ApiError, func()) {
        err := s.client.Quit(r.Context(), s.promURL)
        if err != nil {
                return internalError(fmt.Errorf("failed to quit prometheus: %w", err))
        }

        db, err := tsdb.OpenDBReadOnly(s.dataDir, s.logger)
        if err != nil {
                return internalError(fmt.Errorf("failed to start read-only tsdb: %w", err))
        }

        err = db.FlushWAL(s.dataDir)
        if err != nil {
                return internalError(fmt.Errorf("failed to flush WAL to disk: %w", err))

        }

        uploaded, err := s.shipper.Sync(r.Context())
        if err != nil {
                return internalError(fmt.Errorf("failed to upload block: %w", err))
        }

        // as everything in WAL has been persisted to a block, clear it to avoid overlapping blocks
        // if the prometheus instance starts again
        walDir := s.dataDir + "/wal"
        if err := os.RemoveAll(walDir); err != nil {
                s.logger.Log("failed to remove wal directory", err.Error())
        }

        return &flushResponse{BlocksUploaded: uploaded}, nil, nil, func() {}
}