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net/netcheck: adjust HTTPS latency check to connection time and avoid data race

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The go-httpstat package has a data race when used with connections that
are performing happy-eyeballs connection setups as we are in the DERP
client. There is a long-stale PR upstream to address this, however
revisiting the purpose of this code suggests we don't really need
httpstat here.

The code populates a latency table that may be used to compare to STUN
latency, which is a lightweight RTT check. Switching out the reported
timing here to simply the request HTTP request RTT avoids the
problematic package.

Fixes tailscale/corp#25095

Signed-off-by: James Tucker <james@tailscale.com>
This commit is contained in:
James Tucker
2024-12-05 12:42:45 -08:00
committed by James Tucker
parent 73128e2523
commit aa04f61d5e
4 changed files with 19 additions and 12 deletions
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cmd/k8s-operator/depaware.txt
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@@ -225,7 +225,6 @@ tailscale.com/cmd/k8s-operator dependencies: (generated by github.com/tailscale/
github.com/tailscale/wireguard-go/rwcancel from github.com/tailscale/wireguard-go/device+
github.com/tailscale/wireguard-go/tai64n from github.com/tailscale/wireguard-go/device
💣 github.com/tailscale/wireguard-go/tun from github.com/tailscale/wireguard-go/device+
github.com/tcnksm/go-httpstat from tailscale.com/net/netcheck
L github.com/u-root/uio/rand from github.com/insomniacslk/dhcp/dhcpv4
L github.com/u-root/uio/uio from github.com/insomniacslk/dhcp/dhcpv4+
L github.com/vishvananda/netns from github.com/tailscale/netlink+