server: add OnGetCFTypes callback to serverPeer

server.go

@@ -873,6 +873,18 @@ func (sp *serverPeer) OnGetCFHeaders(_ *peer.Peer, msg *wire.MsgGetCFHeaders) {
 	sp.QueueMessage(headersMsg, nil)
 }
 
+// OnGetCFTypes is invoked when a peer receives a getcftypes bitcoin message.
+func (sp *serverPeer) OnGetCFTypes(_ *peer.Peer, msg *wire.MsgGetCFTypes) {
+	// Ignore getcftypes requests if cfg.NoCFilters is set or we're not in
+	// sync.
+	if cfg.NoCFilters || !sp.server.blockManager.IsCurrent() {
+		return
+	}
+
+	cfTypesMsg := wire.NewMsgCFTypes([]uint8{0, 1})
+	sp.QueueMessage(cfTypesMsg, nil)
+}
+
 // enforceNodeBloomFlag disconnects the peer if the server is not configured to
 // allow bloom filters.  Additionally, if the peer has negotiated to a protocol
 // version  that is high enough to observe the bloom filter service support bit,
@@ -1722,6 +1734,7 @@ func newPeerConfig(sp *serverPeer) *peer.Config {
 			OnGetHeaders:   sp.OnGetHeaders,
 			OnGetCFilter:   sp.OnGetCFilter,
 			OnGetCFHeaders: sp.OnGetCFHeaders,
+			OnGetCFTypes:   sp.OnGetCFTypes,
 			OnFeeFilter:    sp.OnFeeFilter,
 			OnFilterAdd:    sp.OnFilterAdd,
 			OnFilterClear:  sp.OnFilterClear,