Add default impl of ChannelScorer to Route

Author: sourabhmarathe

lightning/src/routing/router.rs

@@ -9,7 +9,7 @@ use chain::chaininterface::ChainWatchInterface;
 use ln::channelmanager;
 use ln::features::{ChannelFeatures, NodeFeatures};
 use ln::msgs::{DecodeError,ErrorAction,LightningError};
-use routing::network_graph::{NetGraphMsgHandler, RoutingFees};
+use routing::network_graph::{NetGraphMsgHandler, RoutingFees, ChannelScorer};
 use util::ser::{Writeable, Readable};
 use util::logger::Logger;
 
@@ -104,6 +104,12 @@ impl Readable for Route {
 	}
 }
 
+/// Another default implementation of ChannelScorer. The use case is a user processing the
+/// success/failure of a given Route. They can implement these functions to fit their needs.
+impl ChannelScorer for Route {
+	type Metadata = Option<u8>;
+}
+
 /// A channel descriptor which provides a last-hop route to get_route
 pub struct RouteHint {
 	/// The node_id of the non-target end of the route