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wgengine/magicsock: track per-endpoint changes in ringbuffer

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This change adds a ringbuffer to each magicsock endpoint that keeps a
fixed set of "changes"–debug information about what updates have been
made to that endpoint.

Additionally, this adds a LocalAPI endpoint and associated
"debug peer-status" CLI subcommand to fetch the set of changes for a given
IP or hostname.

Updates tailscale/corp#9364

Signed-off-by: Andrew Dunham <andrew@du.nham.ca>
Change-Id: I34f726a71bddd0dfa36ec05ebafffb24f6e0516a
This commit is contained in:
Andrew Dunham
2023-02-21 15:57:08 -05:00
parent 9245d813c6
commit be107f92d3
6 changed files with 278 additions and 6 deletions
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cmd/tailscaled/depaware.txt
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@@ -303,6 +303,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
tailscale.com/util/osshare from tailscale.com/ipn/ipnlocal+
W tailscale.com/util/pidowner from tailscale.com/ipn/ipnauth
tailscale.com/util/racebuild from tailscale.com/logpolicy
tailscale.com/util/ringbuffer from tailscale.com/wgengine/magicsock
tailscale.com/util/set from tailscale.com/health+
tailscale.com/util/singleflight from tailscale.com/control/controlclient+
tailscale.com/util/slicesx from tailscale.com/net/dnscache+