gossip: Added scheleton for `getroute` calls

This includes the request/reply passed from the main daemon to
`gossipd` and the basic handlers.

lightningd/gossip/gossip.c

@@ -451,6 +451,12 @@ static struct io_plan *release_peer(struct io_conn *conn, struct daemon *daemon,
 		      "Unknown peer %"PRIu64, unique_id);
 }
 
+static struct io_plan *getroute(struct io_conn *conn, struct daemon *daemon, u8 *msg)
+{
+	return next_req_in(conn, daemon);
+}
+
+
 static struct io_plan *getnodes(struct io_conn *conn, struct daemon *daemon)
 {
 	tal_t *tmpctx = tal_tmpctx(daemon);
@@ -493,8 +499,12 @@ static struct io_plan *recv_req(struct io_conn *conn, struct daemon_conn *master
 	case WIRE_GOSSIP_GETNODES_REQUEST:
 		return getnodes(conn, daemon);
 
+	case WIRE_GOSSIP_GETROUTE_REQUEST:
+		return getroute(conn, daemon, daemon->msg_in);
+
 	case WIRE_GOSSIPCTL_RELEASE_PEER_REPLY:
 	case WIRE_GOSSIP_GETNODES_REPLY:
+	case WIRE_GOSSIP_GETROUTE_REPLY:
 	case WIRE_GOSSIPSTATUS_INIT_FAILED:
 	case WIRE_GOSSIPSTATUS_BAD_NEW_PEER_REQUEST:
 	case WIRE_GOSSIPSTATUS_BAD_RELEASE_REQUEST:

lightningd/gossip/gossip_wire.csv

@@ -60,3 +60,14 @@ gossip_getnodes_request,5
 gossip_getnodes_reply,105
 gossip_getnodes_reply,0,num_nodes,u16
 gossip_getnodes_reply,2,nodes,num_nodes*struct gossip_getnodes_entry
+
+# Pass JSON-RPC getroute call through
+gossip_getroute_request,6
+gossip_getroute_request,0,source,struct pubkey
+gossip_getroute_request,33,destination,struct pubkey
+gossip_getroute_request,66,msatoshi,u32
+gossip_getroute_request,70,riskfactor,u16
+
+gossip_getroute_reply,106
+gossip_getroute_reply,0,num_hops,u16
+gossip_getroute_reply,2,hops,num_hops*struct route_hop

lightningd/gossip_control.c

@@ -142,9 +142,11 @@ static size_t gossip_msg(struct subd *gossip, const u8 *msg, const int *fds)
 	case WIRE_GOSSIPCTL_NEW_PEER:
 	case WIRE_GOSSIPCTL_RELEASE_PEER:
 	case WIRE_GOSSIP_GETNODES_REQUEST:
+	case WIRE_GOSSIP_GETROUTE_REQUEST:
 	/* This is a reply, so never gets through to here. */
 	case WIRE_GOSSIPCTL_RELEASE_PEER_REPLY:
 	case WIRE_GOSSIP_GETNODES_REPLY:
+	case WIRE_GOSSIP_GETROUTE_REPLY:
 		break;
 	case WIRE_GOSSIPSTATUS_PEER_BAD_MSG:
 		peer_bad_message(gossip, msg);
@@ -218,3 +220,14 @@ static const struct json_command getnodes_command = {
     "getnodes", json_getnodes, "Retrieve all nodes in our local network view",
     "Returns a list of all nodes that we know about"};
 AUTODATA(json_command, &getnodes_command);
+
+static void json_getroute(struct command *cmd, const char *buffer, const jsmntok_t *params)
+{
+}
+
+static const struct json_command getroute_command = {
+	"getroute", json_getroute,
+	"Return route to {id} for {msatoshi}, using {riskfactor}",
+	"Returns a {route} array of {id} {msatoshi} {delay}: msatoshi and delay (in blocks) is cumulative."
+};
+AUTODATA(json_command, &getroute_command);