Controller using GObject Introspection

controller.vala

public HandlerCallback controller (string namespace) {
  return (req, res, next, ctx) => {
     var controller_type = Type.from_name ("%s%s".printf (namespace, ctx["controller"]));
     
     if (!controller_type.is_classed ())
      throw new ClientError.NOT_FOUND ("'%s' is not an existing controller", ctx["controller"]);
      
    var controller = Object.new (controller_type);
    
    var action_info = GI.Repository.get_default ().find_by_name (namespace, 
                                                                  "%s_action_%s".printf (ctx["controller"],
                                                                  ctx["action"].get_string () ?? "index"));
                                                                  
    if (action_info is UnresolvedInfo)
      throw new ClientError ("no such action '%s'", ctx["action"].get_string () ?? "index");
      
    // assume you go through http://valadoc.org/#!wiki=gobject-introspection-1.0/index
    //
    //  - obtain an CallableInfo for the action
    //  - obtain the function symbol
    //  - build the arguments (tricky part)
    
    CallableInfo.invoke (action_info as CallableInfo, callable_symbol, arguments, 4, null, 0, true, true);
  }
}

sample-usage.vala

using Valum;
using VSGI.HTTP;

var app = new Router ();

app.rule (Method.GET | Method.POST, "<controller>(/<action>)", controller);

new Server ("org.valum.example.Controller", app.handle).run ();