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ipnlocal: ensure TailFS share notifications are non-nil

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This allows the UI to distinguish between 'no shares' versus
'not being notified about shares'.

Updates ENG-2843

Signed-off-by: Percy Wegmann <percy@tailscale.com>
This commit is contained in:
Percy Wegmann 2024-03-20 10:15:05 -05:00 committed by Percy Wegmann
parent 20e9f3369d
commit 067ed0bf6f
1 changed files with 4 additions and 4 deletions
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8
ipn/ipnlocal/tailfs.go
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@ -274,6 +274,10 @@ func (b *LocalBackend) tailFSSetSharesLocked(shares []*tailfs.Share) error {
// tailFSNotifyShares notifies IPN bus listeners (e.g. Mac Application process)
// about the latest list of shares.
func (b *LocalBackend) tailFSNotifyShares(shares views.SliceView[*tailfs.Share, tailfs.ShareView]) {
// Ensures shares is not nil to distinguish "no shares" from "not notifying shares"
if shares.IsNil() {
shares = views.SliceOfViews(make([]*tailfs.Share, 0))
}
b.send(ipn.Notify{TailFSShares: shares})
}
@ -289,10 +293,6 @@ func (b *LocalBackend) tailFSNotifyCurrentSharesLocked() {
lastNotified := b.lastNotifiedTailFSShares.Load()
if lastNotified == nil || !tailFSShareViewsEqual(lastNotified, shares) {
// Do the below on a goroutine to avoid deadlocking on b.mu in b.send().
if shares.IsNil() {
// set to a non-nil value to indicate we have 0 shares
shares = views.SliceOfViews(make([]*tailfs.Share, 0))
}
go b.tailFSNotifyShares(shares)
}
}