class Gem::Request::ConnectionPools

def close_all
  @pools.each_value {|pool| pool.close_all}
end

def get_no_proxy_from_env
  env_no_proxy = ENV['no_proxy'] || ENV['NO_PROXY']
  return [] if env_no_proxy.nil?  or env_no_proxy.empty?
  env_no_proxy.split(/\s*,\s*/)
end

def https? uri
  uri.scheme.downcase == 'https'
end

def initialize proxy_uri, cert_files
  @proxy_uri  = proxy_uri
  @cert_files = cert_files
  @pools      = {}
  @pool_mutex = Mutex.new
end

def net_http_args uri, proxy_uri
  # URI::Generic#hostname was added in ruby 1.9.3, use it if exists, otherwise
  # don't support IPv6 literals and use host.
  hostname = uri.respond_to?(:hostname) ? uri.hostname : uri.host
  net_http_args = [hostname, uri.port]
  no_proxy = get_no_proxy_from_env
  if proxy_uri and not no_proxy?(hostname, no_proxy) then
    proxy_hostname = proxy_uri.respond_to?(:hostname) ? proxy_uri.hostname : proxy_uri.host
    net_http_args + [
      proxy_hostname,
      proxy_uri.port,
      Gem::UriFormatter.new(proxy_uri.user).unescape,
      Gem::UriFormatter.new(proxy_uri.password).unescape,
    ]
  elsif no_proxy? hostname, no_proxy then
    net_http_args + [nil, nil]
  else
    net_http_args
  end
end

def no_proxy? host, env_no_proxy
  host = host.downcase
  env_no_proxy.any? do |pattern|
    pattern = pattern.downcase
    host[-pattern.length, pattern.length] == pattern or
      (pattern.start_with? '.' and pattern[1..-1] == host)
  end
end

def pool_for uri
  http_args = net_http_args(uri, @proxy_uri)
  key       = http_args + [https?(uri)]
  @pool_mutex.synchronize do
    @pools[key] ||=
      if https? uri then
        Gem::Request::HTTPSPool.new(http_args, @cert_files, @proxy_uri)
      else
        Gem::Request::HTTPPool.new(http_args, @cert_files, @proxy_uri)
      end
  end
end