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client/local, ipn/localapi, ipn/ipnlocal: add PeerByID

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Add a narrow LocalAPI accessor and matching client/LocalBackend method
to look up a single peer's current full [tailcfg.Node] by NodeID, in
O(1) time on the daemon side, without fetching the entire netmap.

Useful for callers that need the latest state of a single peer (e.g.
in response to a peer-mutation event on the IPN bus) without paying
for a full netmap fetch.

Updates #12542

Change-Id: I1cb2d350e6ad846a5dabc1f5368dfc8121387f7c
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2026-05-01 04:03:55 +00:00
committed by Brad Fitzpatrick
parent cac94f51cc
commit 89a78dc9b7
4 changed files with 130 additions and 0 deletions
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ipn/ipnlocal/local.go
+10
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@@ -1621,6 +1621,16 @@ func (b *LocalBackend) PeerCaps(src netip.Addr) tailcfg.PeerCapMap {
return b.currentNode().PeerCaps(src)
}
// PeerByID returns the current full [tailcfg.Node] for the peer with the
// given NodeID, in O(1) time. It returns ok=false if no such peer is in
// the current netmap.
//
// It is intended for callers that need the latest state of a single peer
// without fetching the entire netmap.
func (b *LocalBackend) PeerByID(id tailcfg.NodeID) (n tailcfg.NodeView, ok bool) {
return b.currentNode().NodeByID(id)
}
func (b *LocalBackend) GetFilterForTest() *filter.Filter {
testenv.AssertInTest()
nb := b.currentNode()