routing+server: expose DefaultChannelPruneExpiry

routing/router.go

@@ -33,6 +33,10 @@ const (
 	// if we should give up on a payment attempt. This will be used if a
 	// value isn't specified in the LightningNode struct.
 	defaultPayAttemptTimeout = time.Duration(time.Second * 60)
+
+	// DefaultChannelPruneExpiry is the default duration used to determine
+	// if a channel should be pruned or not.
+	DefaultChannelPruneExpiry = time.Duration(time.Hour * 24 * 14)
 )
 
 var (

server.go

@@ -583,7 +583,7 @@ func newServer(listenAddrs []net.Addr, chanDB *channeldb.DB, cc *chainControl,
 				firstHop, htlcAdd, errorDecryptor,
 			)
 		},
-		ChannelPruneExpiry: time.Duration(time.Hour * 24 * 14),
+		ChannelPruneExpiry: routing.DefaultChannelPruneExpiry,
 		GraphPruneInterval: time.Duration(time.Hour),
 		QueryBandwidth: func(edge *channeldb.ChannelEdgeInfo) lnwire.MilliSatoshi {
 			// If we aren't on either side of this edge, then we'll