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This adds a Python version of the async DNS support added in: 771680d96 DNS: Add basic support for asynchronous DNS resolving The above version uses the unbound C library, and this implimentation uses the SWIG-wrapped Python version of that. In the event that the Python unbound library is not available, a warning will be logged and the resolve() method will just return None. For the case where inet_parse_active() is passed an IP address, it will not try to resolve it, so existing behavior should be preserved in the case that the unbound library is unavailable. Intentional differences from the C version are as follows: OVS_HOSTS_FILE environment variable can bet set to override the system 'hosts' file. This is primarily to allow testing to be done without requiring network connectivity. Since resolution can still be done via hosts file lookup, DNS lookups are not disabled when resolv.conf cannot be loaded. The Python socket_util module has fallen behind its C equivalent. The bare minimum change was done to inet_parse_active() to support sync/async dns, as there is no equivalent to parse_sockaddr_components(), inet_parse_passive(), etc. A TODO was added to bring socket_util.py up to equivalency to the C version. Signed-off-by: Terry Wilson <twilson@redhat.com> Signed-off-by: Ilya Maximets <i.maximets@ovn.org>
Python library for working with Open vSwitch