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import socket 

try: 

    from select import poll, POLLIN 

except ImportError:  # `poll` doesn't exist on OSX and other platforms 

    poll = False 

    try: 

        from select import select 

    except ImportError:  # `select` doesn't exist on AppEngine. 

        select = False 

 

 

def is_connection_dropped(conn):  # Platform-specific 

    """ 

    Returns True if the connection is dropped and should be closed. 

 

    :param conn: 

        :class:`httplib.HTTPConnection` object. 

 

    Note: For platforms like AppEngine, this will always return ``False`` to 

    let the platform handle connection recycling transparently for us. 

    """ 

    sock = getattr(conn, 'sock', False) 

    if sock is False:  # Platform-specific: AppEngine 

        return False 

    if sock is None:  # Connection already closed (such as by httplib). 

        return True 

 

    if not poll: 

        if not select:  # Platform-specific: AppEngine 

            return False 

 

        try: 

            return select([sock], [], [], 0.0)[0] 

        except socket.error: 

            return True 

 

    # This version is better on platforms that support it. 

    p = poll() 

    p.register(sock, POLLIN) 

    for (fno, ev) in p.poll(0.0): 

        if fno == sock.fileno(): 

            # Either data is buffered (bad), or the connection is dropped. 

            return True 

 

 

# This function is copied from socket.py in the Python 2.7 standard 

# library test suite. Added to its signature is only `socket_options`. 

def create_connection(address, timeout=socket._GLOBAL_DEFAULT_TIMEOUT, 

                      source_address=None, socket_options=None): 

    """Connect to *address* and return the socket object. 

 

    Convenience function.  Connect to *address* (a 2-tuple ``(host, 

    port)``) and return the socket object.  Passing the optional 

    *timeout* parameter will set the timeout on the socket instance 

    before attempting to connect.  If no *timeout* is supplied, the 

    global default timeout setting returned by :func:`getdefaulttimeout` 

    is used.  If *source_address* is set it must be a tuple of (host, port) 

    for the socket to bind as a source address before making the connection. 

    An host of '' or port 0 tells the OS to use the default. 

    """ 

 

    host, port = address 

    err = None 

    for res in socket.getaddrinfo(host, port, 0, socket.SOCK_STREAM): 

        af, socktype, proto, canonname, sa = res 

        sock = None 

        try: 

            sock = socket.socket(af, socktype, proto) 

 

            # If provided, set socket level options before connecting. 

            # This is the only addition urllib3 makes to this function. 

            _set_socket_options(sock, socket_options) 

 

            if timeout is not socket._GLOBAL_DEFAULT_TIMEOUT: 

                sock.settimeout(timeout) 

            if source_address: 

                sock.bind(source_address) 

            sock.connect(sa) 

            return sock 

 

        except socket.error as _: 

            err = _ 

            if sock is not None: 

                sock.close() 

                sock = None 

 

    if err is not None: 

        raise err 

    else: 

        raise socket.error("getaddrinfo returns an empty list") 

 

 

def _set_socket_options(sock, options): 

    if options is None: 

        return 

 

    for opt in options: 

        sock.setsockopt(*opt)