class Excon::Socket

def connect
  @socket = nil
  exception = nil
  addrinfo = if @data[:proxy]
    ::Socket.getaddrinfo(@data[:proxy][:host], @data[:proxy][:port], @data[:proxy][:family], ::Socket::Constants::SOCK_STREAM)
  else
    ::Socket.getaddrinfo(@data[:host], @data[:port], @data[:family], ::Socket::Constants::SOCK_STREAM)
  end
  addrinfo.each do |_, port, _, ip, a_family, s_type|
    @remote_ip = ip
    # nonblocking connect
    begin
      sockaddr = ::Socket.sockaddr_in(port, ip)
      socket = ::Socket.new(a_family, s_type, 0)
      if @data[:nonblock]
        socket.connect_nonblock(sockaddr)
      else
        begin
          Timeout.timeout(@data[:connect_timeout]) do
            socket.connect(sockaddr)
          end
        rescue Timeout::Error
          raise Excon::Errors::Timeout.new('connect timeout reached')
        end
      end
      @socket = socket
      break
    rescue Errno::EINPROGRESS
      unless IO.select(nil, [socket], nil, @data[:connect_timeout])
        raise(Excon::Errors::Timeout.new("connect timeout reached"))
      end
      begin
        socket.connect_nonblock(sockaddr)
        @socket = socket
        break
      rescue Errno::EISCONN
        @socket = socket
        break
      rescue SystemCallError => exception
        socket.close
        next
      end
    rescue SystemCallError => exception
      socket.close if socket
      next
    end
  end
  unless @socket
    # this will be our last encountered exception
    raise exception
  end
  if @data[:tcp_nodelay]
    @socket.setsockopt(::Socket::IPPROTO_TCP,
                       ::Socket::TCP_NODELAY,
                       true)
  end
end