Cuong Manh Le a983dfaee2 all: optimizing multiple queries to upstreams ...

To guard ctrld from possible DoS to remote upstreams, this commit
implements following things:

 - Optimizing multiple queries with the same domain and qtype to use
   singleflight group, so there's only 1 query to remote upstreams at
   any time.
 - Adding a hot cache with 1 second TTL, so repeated queries will re-use
   the result from cache if existed, preventing unnecessary requests to
   remote upstreams.

2025-05-23 21:09:15 +07:00

22 KiB

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