class HTTP::Timeout::PerOperation

def connect(socket_class, host, port, nodelay = false)
  ::Timeout.timeout(@connect_timeout, ConnectTimeoutError) do
    @socket = socket_class.open(host, port)
    @socket.setsockopt(Socket::IPPROTO_TCP, Socket::TCP_NODELAY, 1) if nodelay
  end
end

def connect_ssl
  rescue_readable(@connect_timeout) do
    rescue_writable(@connect_timeout) do
      @socket.connect_nonblock
    end
  end
end

def initialize(*args)
  super
  @read_timeout = options.fetch(:read_timeout, READ_TIMEOUT)
  @write_timeout = options.fetch(:write_timeout, WRITE_TIMEOUT)
  @connect_timeout = options.fetch(:connect_timeout, CONNECT_TIMEOUT)
end

def readpartial(size, buffer = nil)
  timeout = false
  loop do
    result = @socket.read_nonblock(size, buffer, :exception => false)
    return :eof   if result.nil?
    return result if result != :wait_readable
    raise TimeoutError, "Read timed out after #{@read_timeout} seconds" if timeout
    # marking the socket for timeout. Why is this not being raised immediately?
    # it seems there is some race-condition on the network level between calling
    # #read_nonblock and #wait_readable, in which #read_nonblock signalizes waiting
    # for reads, and when waiting for x seconds, it returns nil suddenly without completing
    # the x seconds. In a normal case this would be a timeout on wait/read, but it can
    # also mean that the socket has been closed by the server. Therefore we "mark" the
    # socket for timeout and try to read more bytes. If it returns :eof, it's all good, no
    # timeout. Else, the first timeout was a proper timeout.
    # This hack has to be done because io/wait#wait_readable doesn't provide a value for when
    # the socket is closed by the server, and HTTP::Parser doesn't provide the limit for the chunks.
    timeout = true unless @socket.to_io.wait_readable(@read_timeout)
  end
end

def write(data)
  timeout = false
  loop do
    result = @socket.write_nonblock(data, :exception => false)
    return result unless result == :wait_writable
    raise TimeoutError, "Write timed out after #{@write_timeout} seconds" if timeout
    timeout = true unless @socket.to_io.wait_writable(@write_timeout)
  end
end