Rails session file store

session_file_store.rb

class SessionFileStore < ActionDispatch::Session::AbstractStore
  def get_session(env, sid)
    sid ||= generate_sid
    session = Marshal.load(IO.binread(tmp_file(sid))) rescue nil
    [sid, session.presence || {}]
  end

  def set_session(env, sid, session, options)
    Dir.mkdir(sessions_path) unless Dir.exist? sessions_path
    IO.binwrite(tmp_file(sid), Marshal.dump(session))
    sid
  end

  def destroy_session(env, sid, options)
    File.unlink(tmp_file(sid)) if File.exists? tmp_file(sid)
    generate_sid
  end

  private

  def tmp_file(sid)
    File.join(sessions_path, sid)
  end

  def sessions_path
    File.join(Rails.root, "tmp", "sessions")
  end
end

Rails.application.config.session_store :session_file_store