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tailscale/net/dnsfallback
Andrew Dunham e33bc64cff net/dnsfallback: add singleflight to recursive resolver
This prevents running more than one recursive resolution for the same
hostname in parallel, which can use excessive amounts of CPU when called
in a tight loop. Additionally, add tests that hit the network (when
run with a flag) to test the lookup behaviour.

Updates tailscale/corp#15261

Signed-off-by: Andrew Dunham <andrew@du.nham.ca>
Change-Id: I39351e1d2a8782dd4c52cb04b3bd982eb651c81e
12 months ago
..
dns-fallback-servers.json
dnsfallback.go net/dnsfallback: add singleflight to recursive resolver 12 months ago
dnsfallback_test.go net/dnsfallback: add singleflight to recursive resolver 12 months ago
update-dns-fallbacks.go