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o �hx/ � @ s� d Z ddlZddlZddlZddlZddlZddlZddlmZm Z ddl mZ ddlm Z ddlmZ ddlmZ ddlmZ dd lmZmZmZmZmZmZmZmZ ejr]dd lmZ dZG dd � d e�Z G dd� de�Z!dS )z'A non-blocking TCP connection factory. � N)�Future�future_add_done_callback)�IOLoop)�IOStream)�gen)�Resolver)�TimeoutError)�Any�Union�Dict�Tuple�List�Callable�Iterator�Optional)�Setg333333�?c @ sV e Zd ZdZdee deejegee df f ddfdd�Z edee deeeejef eeejef f fd d ��Ze dfdedeeeejf dd fdd�Zdeeejef ddfdd�Zdeeejef dejdeddddf dd�Zdeddfdd�Zd&dd�Zd&dd�Zdeeejf ddfdd�Zd&d d!�Zd&d"d#�Zd&d$d%�ZdS )'� _Connectora� A stateless implementation of the "Happy Eyeballs" algorithm. "Happy Eyeballs" is documented in RFC6555 as the recommended practice for when both IPv4 and IPv6 addresses are available. In this implementation, we partition the addresses by family, and make the first connection attempt to whichever address was returned first by ``getaddrinfo``. If that connection fails or times out, we begin a connection in parallel to the first address of the other family. If there are additional failures we retry with other addresses, keeping one connection attempt per family in flight at a time. http://tools.ietf.org/html/rfc6555 �addrinfo�connect�Future[IOStream]�returnNc C sR t �� | _|| _t� | _d | _d | _d | _t |�| _ | �|�\| _| _ t� | _d S �N)r �current�io_loopr r �future�timeout�connect_timeout� last_error�len� remaining�split� primary_addrs�secondary_addrs�set�streams)�selfr r � r&