Sinatra で Rack:Session::Dalli を使って SASL 認証付きの memcached を使いたい場合

app.rb

class App < Sinatra::Base
  configure do
    use Rack::Session::Dalli,
      cache: Dalli::Client.new(
        "#{ENV['MEMCACHE_SERVER']}:#{ENV['MEMCACHE_PORT']}",
        username: ENV['MEMCACHE_USERNAME'],
        password: ENV['MEMCACHE_PASSWORD']
      )
  end
end