Blocking API used to resolve host names

[David Mikulec]

From the Drizzle wiki, the Drizzle Client & Protocol Library "... provides complete non-blocking I/O support", however it appears to use getaddrinfo to resolve hostnames when making connections, which is a blocking call. Can this be re-worked to be made non-blocking?

[Andrew Hutchings (linuxjedi)]

this could wrap in nicely with the libevent work

[Brian Aker (brianaker)]

This is not hard to fix in the current code. The event loop has to be modified only slightly to make it work.

[Wim Lewis (wiml-omni)]

I think c-ares <http://c-ares.haxx.se/> would be a reasonable nonblocking-DNS implementation to use.

I think it would be beneficial to keep the option to use the system's getaddrinfo, though, perhaps through a 'configure' option. Sometimes compatibility with the host's quirky name resolution behavior is more important than a completely nonblocking library.

[Andrew Hutchings (linuxjedi)]

I was originally thinking of using the one in libevent. But that could work too.

And agree this should be a build option.