wsgi.py 文件源码

def get_socket(conf, default_port):
    '''Bind socket to bind ip:port in conf

    :param conf: a cfg.ConfigOpts object
    :param default_port: port to bind to if none is specified in conf

    :returns : a socket object as returned from socket.listen or
               ssl.wrap_socket if conf specifies cert_file
    '''

    bind_addr = get_bind_addr(conf, default_port)

    # TODO(jaypipes): eventlet's greened socket module does not actually
    # support IPv6 in getaddrinfo(). We need to get around this in the
    # future or monitor upstream for a fix
    address_family = [addr[0] for addr in socket.getaddrinfo(bind_addr[0],
                      bind_addr[1], socket.AF_UNSPEC, socket.SOCK_STREAM)
                      if addr[0] in (socket.AF_INET, socket.AF_INET6)][0]

    cert_file = conf.cert_file
    key_file = conf.key_file
    use_ssl = cert_file or key_file
    if use_ssl and (not cert_file or not key_file):
        raise RuntimeError(_("When running server in SSL mode, you must "
                             "specify both a cert_file and key_file "
                             "option value in your configuration file"))

    sock = None
    retry_until = time.time() + 30
    while not sock and time.time() < retry_until:
        try:
            sock = eventlet.listen(bind_addr, backlog=conf.backlog,
                                   family=address_family)
        except socket.error as err:
            if err.args[0] != errno.EADDRINUSE:
                raise
            eventlet.sleep(0.1)

    if not sock:
        raise RuntimeError(_("Could not bind to %(bind_addr)s after trying "
                             " 30 seconds") % {'bind_addr': bind_addr})
    return sock