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appc: don't schedule advertisement of 0 routes

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When the store-appc-routes flag is on for a tailnet we are writing the
routes more often than seems necessary. Investigation reveals that we
are doing so ~every time we observe a dns response, even if this causes
us not to advertise any new routes. So when we have no new routes,
instead do not advertise routes.

Fixes #12593

Signed-off-by: Fran Bull <fran@tailscale.com>
This commit is contained in:
Fran Bull 2024-06-24 14:45:04 -07:00 committed by franbull
parent 24a40f54d9
commit 7eb8a77ac8
1 changed files with 4 additions and 2 deletions
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6
appc/appconnector.go
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@ -442,8 +442,10 @@ func (e *AppConnector) ObserveDNSResponse(res []byte) {
}
}
e.logf("[v2] observed new routes for %s: %s", domain, toAdvertise)
e.scheduleAdvertisement(domain, toAdvertise...)
if len(toAdvertise) > 0 {
e.logf("[v2] observed new routes for %s: %s", domain, toAdvertise)
e.scheduleAdvertisement(domain, toAdvertise...)
}
}
}