Description
Caching asynchronous DNS resolver.
Description
Caching asynchronous DNS resolver built on top of GNU ADNS http://www.chiark.greenend.org.uk/~ian/adns/.
Resolves several IP addresses for one host (if available) in round-robin fashion.
Throttles number of parallel requests (so DNS resolving continues to work even under heavy load).
Errors are cached too (for one minute).
Handles CNAMEs (
hsdnsreturns error for them).
This cache is tested in a long running web-crawler (used in https://bazqux.com) so it should be safe to use it in real world applications.