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ipn: define NewBackendServer nil as not affecting Backend's NotifyCallback

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Updates tailscale/corp#1646

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2021-04-22 15:47:28 -07:00
parent 30629c430a
commit 8a449c4dcd
2 changed files with 13 additions and 1 deletions
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12
ipn/message.go
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@ -93,17 +93,27 @@ type BackendServer struct {
GotQuit bool // a Quit command was received
}
// NewBackendServer creates a new BackendServer using b.
//
// If sendNotifyMsg is non-nil, it additionally sets the Backend's
// notification callback to call the func with ipn.Notify messages in
// JSON form. If nil, it does not change the notification callback.
func NewBackendServer(logf logger.Logf, b Backend, sendNotifyMsg func(b []byte)) *BackendServer {
bs := &BackendServer{
logf: logf,
b: b,
sendNotifyMsg: sendNotifyMsg,
}
b.SetNotifyCallback(bs.send)
if sendNotifyMsg != nil {
b.SetNotifyCallback(bs.send)
}
return bs
}
func (bs *BackendServer) send(n Notify) {
if bs.sendNotifyMsg == nil {
return
}
n.Version = version.Long
b, err := json.Marshal(n)
if err != nil {