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wgengine/magicsock: only used cached results for GetLastNetcheckReport

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When querying for an exit node suggestion, occasionally it triggers a
new report concurrently with an existing report in progress. Generally,
there should always be a recent report or one in progress, so it is
redundant to start one there, and it causes concurrency issues.

Fixes #12643

Change-Id: I66ab9003972f673e5d4416f40eccd7c6676272a5
Signed-off-by: Adrian Dewhurst <adrian@tailscale.com>
This commit is contained in:
Adrian Dewhurst 2024-09-25 14:50:39 -04:00 committed by Adrian Dewhurst
parent c2f0c705e7
commit 2fdbcbdf86
1 changed files with 2 additions and 11 deletions
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13
wgengine/magicsock/magicsock.go
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@ -3027,18 +3027,9 @@ func getPeerMTUsProbedMetric(mtu tstun.WireMTU) *clientmetric.Metric {
return mm
}
// GetLastNetcheckReport returns the last netcheck report, running a new one if a recent one does not exist.
// GetLastNetcheckReport returns the last netcheck report, returning nil if a recent one does not exist.
func (c *Conn) GetLastNetcheckReport(ctx context.Context) *netcheck.Report {
lastReport := c.lastNetCheckReport.Load()
if lastReport == nil {
nr, err := c.updateNetInfo(ctx)
if err != nil {
c.logf("magicsock.Conn.GetLastNetcheckReport: updateNetInfo: %v", err)
return nil
}
return nr
}
return lastReport
return c.lastNetCheckReport.Load()
}
// SetLastNetcheckReportForTest sets the magicsock conn's last netcheck report.