database: add GetRouteForHost function

database/db.go

@@ -66,6 +66,22 @@ func (db *DB) SaveRoute(resp *routerpc.AddHostResponse) error {
 	return nil
 }
 
+func (db *DB) GetRouteForHost(name string) (*Route, error) {
+	rows, err := r.Table("routes").Filter(r.Row.Field("hostname", name).Or(r.Row.Field("onionhostname", name))).Run(db.s)
+	if err != nil {
+		return nil, err
+	}
+
+	result := &Route{}
+
+	err = rows.One(result)
+	if err != nil {
+		return nil, err
+	}
+
+	return result, nil
+}
+
 // GetAllRoutes fetches all of the route entries from the database
 // and returns them. This is intended for the startup process or
 // admin tooling.