Support object oriented controllers about exegesis

[jwalton]

You can do this now, if you handle loading the controllers yourself:

// UserManager.js

export default class UserController {
    constructor(userManager) {
        this.userManager = userManager;
    }

    /**
     * Return a list of all users.
     *
     * @param {ExegesisContext} context - The context to get information from.
     * @returns {User[]} - Users
     */
    async getTags(context) {
        return await this.userManager.getUsers();
    }
}



// server.js

router.use(await exegesisExpress.middleware(OPENAPI_DOC, {
    controllers: {
        userController: new UserController(userManager)
    }
});

I actually do something really similar to this in my project so I can do dependency injection (and I cheat a bit and call into an internal function in Exegesis):

import { loadControllersSync } from 'exegesis/lib/controllers/loadControllers'; // TODO: Expose this in exegesis?

function loadControllers(services) {
    return loadControllersSync(
        path.resolve(__dirname, 'controllers'),
        "**/*.js",
        path => {
            const module = require(path);
            if(module.default) {
                return new module.default(services);
            } else {
                return module;
            }
        }
    );
}

As you can tell from that comment, I've thought about exposing that function directly. Do you think that function would be enough to do what you want? Can you think of a better API for this? I'm certainly open to suggestions. :)

[dploeger]

Ah, okay. Thanks for the clarification, I didn't know, that you can do this. The docs doesn't state that.

The first one would be everything I need, the other one would be great as well. Maybe add a "controllerInstantiationArgs" argument to the constructor, so that the loaded would instantiate the class and add the args as a DI to the controller.