This commit adds a Happy Eyeballs [1] implementation taken from the
happy-eyeballs crate, which is in public domain.
While the function lookup_ip[0] iterates through the addresses returned by
A and AAAA records from a DNS lookup, it returns the first one which
always is an IPv4 address, unless there only is an AAAA record.
RFC6555 [1] recommends an algorithm for choosing the fastest address to
connect to, called "Happy Eyeballs". Ꙭ
[0]: melib/src/utils/connections.rs:497
[1]: https://www.rfc-editor.org/rfc/rfc6555Fixes#268
Source Code Annotation Tags:
Global tags (in tagref format <https://github.com/stepchowfun/tagref>)
for source code annotation:
- [tag:hardcoded_color_value] Replace hardcoded color values with user
configurable ones.
- [tag:needs_unit_test]
- [tag:needs_user_doc]
- [tag:needs_dev_doc]
- [tag:FIXME]
- [tag:TODO]
- [tag:VERIFY] Verify whether this is the correct way to do something
- [tag:DEBT] Technical debt