Dynamic Handlers

Overview

Go-Mojito allows you to mix and match your handler arguments, so you can choose only what you need. Arguments can either be built-in and/or custom request arguments. If they are neither, Go-Mojito will attempt to dependency-inject them.

  • System Component
  • Custom Arguments
  • Not replaceable
  • Dependency Injection

This is a core part of the system, and works the same across all router implementations. This also means that this part cannot be swapped out easily.

Quick Start

  1. Create a handler func without any parameters

    func myHandler() {}

  2. Add mojito.Context, *http.Request and mojito.Cache arguments to the handler.

    func myHandler(ctx mojito.Context, r *http.Request, cache mojito.Cache) {}

  3. Go-Mojito will now detect that you want a mojito.Context, a standard lib *http.Request and the default dependency for mojito.Cache injected into your handler.

FAQ

To inject a non-default instance of a dependency, you need to create a context struct which contains the named dependencies you want to use in your handler. By using the `container:"name"` tag, you indicate that you want to resolve by the field's name and not solely by the type.

type HandlerContext struct {
	CacheName mojito.Cache `container:"name"`
}

func SomeHandler(ctx mojito.Context, handlerCtx *HandlerContext) {}

In the example above, Go-Mojito will try to link the named dependency "CacheName" of the type mojito.Cache. This will fail if there is no such named dependency available.