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control/controlclient: optimize zstd decode of KeepAlive messages

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Maybe it matters? At least globally across all nodes?

Fixes #17343

Change-Id: I3f61758ea37de527e16602ec1a6e453d913b3195
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2025-09-29 15:19:27 -07:00
committed by Brad Fitzpatrick
parent 3ae7a351b4
commit 2cd518a8b6
3 changed files with 57 additions and 2 deletions
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3
control/controlclient/map.go
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@@ -57,6 +57,9 @@ type mapSession struct {
altClock tstime.Clock // if nil, regular time is used
cancel context.CancelFunc // always non-nil, shuts down caller's base long poll context
keepAliveZ []byte // if non-nil, the learned zstd encoding of the just-KeepAlive message for this session
ztdDecodesForTest int // for testing
// sessionAliveCtx is a Background-based context that's alive for the
// duration of the mapSession that we own the lifetime of. It's closed by
// sessionAliveCtxClose.