Returning multiple files as a stream

 ts

export const readAllHandler: RouteHandler<
  typeof readAllRoute,
  AuthorizationBinding
> = async (c) => {
  const { tags } = c.req.valid('query');
  const storeId = c.get('storeId');

  const matchedFiles = (
    await db.query.fileTable.findMany({
      where: and(
        eq(fileTable.storeId, storeId),
        arrayContains(fileTable.tags, tags),
      ),
    })
  ).map((entry) => Bun.file(getFilePath(entry)));

  if (matchedFiles.length === 0) return c.notFound();

  const res = honoStream(c, async (stream) => {
    const tar = archiver('tar');

    tar.on('data', (chunk) => {
      stream.write(chunk);
    });

    tar.on('end', () => {
      stream.close();
    });

    for (let file of matchedFiles) {
      if (!(await file.exists())) continue;
      await file.stream().pipeTo(
        new WritableStream({
          write(chunk) {
            tar.write(chunk);
          },
        }),
      );
    }

    tar.end();
  });

  res.headers.append('Content-Type', 'application/x-tar');
  res.headers.append('Content-Disposition', 'attachment; filename="files.tar"');
  return res;
};