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net/dnsfallback: add singleflight to recursive resolver

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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
This commit is contained in:
Andrew Dunham
2023-10-27 10:25:13 -04:00
parent a40e918d63
commit e33bc64cff
3 changed files with 181 additions and 60 deletions
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cmd/tailscale/depaware.txt
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@@ -155,7 +155,7 @@ tailscale.com/cmd/tailscale dependencies: (generated by github.com/tailscale/dep
tailscale.com/util/nocasemaps from tailscale.com/types/ipproto
tailscale.com/util/quarantine from tailscale.com/cmd/tailscale/cli
tailscale.com/util/set from tailscale.com/health+
tailscale.com/util/singleflight from tailscale.com/net/dnscache
tailscale.com/util/singleflight from tailscale.com/net/dnscache+
tailscale.com/util/slicesx from tailscale.com/net/dnscache+
tailscale.com/util/testenv from tailscale.com/cmd/tailscale/cli
tailscale.com/util/truncate from tailscale.com/cmd/tailscale/cli