def create_connection()

in aliyun-python-sdk-core/aliyunsdkcore/vendored/requests/packages/urllib3/packages/socks.py [0:0]

• 37 lines of code
• 15 McCabe index (conditional complexity)

def create_connection(dest_pair,
                      timeout=None, source_address=None,
                      proxy_type=None, proxy_addr=None,
                      proxy_port=None, proxy_rdns=True,
                      proxy_username=None, proxy_password=None,
                      socket_options=None):
    """create_connection(dest_pair, *[, timeout], **proxy_args) -> socket object

    Like socket.create_connection(), but connects to proxy
    before returning the socket object.

    dest_pair - 2-tuple of (IP/hostname, port).
    **proxy_args - Same args passed to socksocket.set_proxy() if present.
    timeout - Optional socket timeout value, in seconds.
    source_address - tuple (host, port) for the socket to bind to as its source
    address before connecting (only for compatibility)
    """
    # Remove IPv6 brackets on the remote address and proxy address.
    remote_host, remote_port = dest_pair
    if remote_host.startswith("["):
        remote_host = remote_host.strip("[]")
    if proxy_addr and proxy_addr.startswith("["):
        proxy_addr = proxy_addr.strip("[]")

    err = None

    # Allow the SOCKS proxy to be on IPv4 or IPv6 addresses.
    for r in socket.getaddrinfo(proxy_addr, proxy_port, 0, socket.SOCK_STREAM):
        family, socket_type, proto, canonname, sa = r
        sock = None
        try:
            sock = socksocket(family, socket_type, proto)

            if socket_options:
                for opt in socket_options:
                    sock.setsockopt(*opt)

            if isinstance(timeout, (int, float)):
                sock.settimeout(timeout)

            if proxy_type:
                sock.set_proxy(proxy_type, proxy_addr, proxy_port, proxy_rdns,
                               proxy_username, proxy_password)
            if source_address:
                sock.bind(source_address)

            sock.connect((remote_host, remote_port))
            return sock

        except (socket.error, ProxyConnectionError) as e:
            err = e
            if sock:
                sock.close()
                sock = None

    if err:
        raise err

    raise socket.error("gai returned empty list.")