webnet/tailscale
1
0
Fork 0
Code Issues Pull Requests 1 Packages Projects Releases Wiki Activity

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

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files
client/local/local.go
+14
View File
@@ -1064,6 +1064,20 @@ func (lc *Client) DNSConfig(ctx context.Context) (*tailcfg.DNSConfig, error) {
return decodeJSON[*tailcfg.DNSConfig](body)
}
// PeerByID returns a peer's current full [tailcfg.Node] looked up by its
// [tailcfg.NodeID], in O(1) time on the daemon side. It returns an error
// if no peer with that NodeID 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 (lc *Client) PeerByID(ctx context.Context, id tailcfg.NodeID) (*tailcfg.Node, error) {
body, err := lc.get200(ctx, "/localapi/v0/peer-by-id?id="+strconv.FormatInt(int64(id), 10))
if err != nil {
return nil, err
}
return decodeJSON[*tailcfg.Node](body)
}
// PingOpts contains options for the ping request.
//
// The zero value is valid, which means to use defaults.