lnrpc/peers: skeleton logic for updateNodeAnnouncement

Basic logic for the endpoint:

- Get the current nodeAnn information
- Calculate modifications
- Apply modifications
- Return changes

lnrpc/peersrpc/config_active.go

@@ -3,4 +3,27 @@
 
 package peersrpc
 
-type Config struct{}
+import (
+	"net"
+
+	"github.com/lightningnetwork/lnd/lnwire"
+	"github.com/lightningnetwork/lnd/netann"
+)
+
+// Config is the primary configuration struct for the peers RPC subserver.
+// It contains all the items required for the server to carry out its duties.
+// The fields with struct tags are meant to be parsed as normal configuration
+// options, while if able to be populated, the latter fields MUST also be
+// specified.
+type Config struct {
+	// GetNodeAnnouncement is used to send our retrieve the current
+	// node announcement information.
+	GetNodeAnnouncement func() (lnwire.NodeAnnouncement, error)
+
+	// ParseAddr parses an address from its string format to a net.Addr.
+	ParseAddr func(addr string) (net.Addr, error)
+
+	// UpdateNodeAnnouncement updates our node announcement applying the
+	// given NodeAnnModifiers and broadcasts the new version to the network.
+	UpdateNodeAnnouncement func(...netann.NodeAnnModifier) error
+}