server: remove unused SendToPeer method

server.go

@@ -1926,53 +1926,6 @@ func (s *server) BroadcastMessage(skips map[routing.Vertex]struct{},
 	return nil
 }
 
-// SendToPeer send a message to the server telling it to send the specific set
-// of message to a particular peer. If the peer connect be found, then this
-// method will return a non-nil error.
-//
-// NOTE: This function is safe for concurrent access.
-func (s *server) SendToPeer(target *btcec.PublicKey,
-	msgs ...lnwire.Message) error {
-
-	// Compute the target peer's identifier.
-	targetPubBytes := target.SerializeCompressed()
-
-	srvrLog.Tracef("Attempting to send msgs %v to: %x",
-		len(msgs), targetPubBytes)
-
-	// Lookup intended target in peersByPub, returning an error to the
-	// caller if the peer is unknown.  Access to peersByPub is synchronized
-	// here to ensure we consider the exact set of peers present at the
-	// time of invocation.
-	s.mu.RLock()
-	targetPeer, err := s.findPeerByPubStr(string(targetPubBytes))
-	s.mu.RUnlock()
-	if err == ErrPeerNotConnected {
-		srvrLog.Errorf("unable to send message to %x, "+
-			"peer is not connected", targetPubBytes)
-		return err
-	}
-
-	// Send messages to the peer and get the error channels that will be
-	// signaled by the peer's write handler.
-	errChans := s.sendPeerMessages(targetPeer, msgs, nil)
-
-	// With the server's shared lock released, we now handle all of the
-	// errors being returned from the target peer's write handler.
-	for _, errChan := range errChans {
-		select {
-		case err := <-errChan:
-			return err
-		case <-targetPeer.quit:
-			return ErrPeerExiting
-		case <-s.quit:
-			return ErrServerShuttingDown
-		}
-	}
-
-	return nil
-}
-
 // NotifyWhenOnline can be called by other subsystems to get notified when a
 // particular peer comes online. The peer itself is sent across the peerChan.
 //