You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: rack_server.rb
    path of file: ./repos/polyphony/examples/io
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

require 'bundler/setup'
require 'polyphony'
require 'http/parser'
require 'rack'

module RackAdapter
  class << self
    def run(app)
      ->(socket, req) { respond(socket, req, app
    
def handle_client(socket, &handler)
  $connection_count += 1
  parser = Http::Parser.new
  reqs = []
  parser.on_message_complete = proc do |env|
    reqs << Object.new # parser
  end
  socket.read_loop do |data|
    parser << data
    while (req = reqs.shift)
      handler.call(socket, req)
      req = nil
    end
  end