feat(runtime): add resolver, refactor container

The resolver and related refactor enables:

1. Lazy loading of app code, which is now the default. It doesn't
preclude eager loading though, and future work could add an eager load
option for production environments.

2. Customizable directory structures. This is generally not a good idea
for the casual use case, but it's possible that some additional type of
code asset might need different lookup rules (i.e. test files)

3. Cleaner addon / application loading. The application logger is now
customizable by simply adding `app/logger.js` (as long as the interface
matches). Same for the `app/router.js`.

This also solves some outstanding issues: fixes #285, #284

app/logger.ts

@@ -0,0 +1 @@
+export { default } from '../lib/runtime/logger';

app/router.ts

@@ -0,0 +1 @@
+export { default } from '../lib/runtime/router';

lib/runtime/action.ts

@@ -1,8 +1,3 @@
-import Instrumentation from '../metal/instrumentation';
-import Model from '../data/model';
-import Response from './response';
-import * as http from 'http';
-import * as createDebug from 'debug';
 import {
   assign,
   capitalize,
@@ -12,6 +7,11 @@ import {
   compact,
   map
 } from 'lodash';
+import Instrumentation from '../metal/instrumentation';
+import Model from '../data/model';
+import Response from './response';
+import * as http from 'http';
+import * as createDebug from 'debug';
 import * as assert from 'assert';
 import eachPrototype from '../metal/each-prototype';
 import DenaliObject from '../metal/object';
@@ -170,7 +170,7 @@ abstract class Action extends DenaliObject {
     this.request = options.request;
     this.logger = options.logger;
     this.container = options.container;
-    this.config = this.container.config;
+    this.config = this.container.lookup('app:main').config;
   }
 
   /**

lib/runtime/addon.ts

@@ -1,3 +1,8 @@
+import {
+  forEach,
+  omit,
+  noop
+ } from 'lodash';
 import * as path from 'path';
 import * as fs from 'fs-extra';
 import * as glob from 'glob';
@@ -7,18 +12,14 @@ import { sync as isDirectory } from 'is-directory';
 import requireDir from '../utils/require-dir';
 import * as tryRequire from 'try-require';
 import * as stripExtension from 'strip-extension';
-import {
-  forEach,
-  omit,
-  noop
- } from 'lodash';
 import { singularize } from 'inflection';
 import * as createDebug from 'debug';
 import DenaliObject from '../metal/object';
 import Container from './container';
 import Logger from './logger';
 import Router from './router';
 import Application from './application';
+import Resolver from './resolver';
 
 const debug = createDebug('denali:runtime:addon');
 
@@ -32,7 +33,6 @@ export interface AddonOptions {
   environment: string;
   dir: string;
   container: Container;
-  logger: Logger;
   pkg?: any;
 }
 
@@ -85,57 +85,36 @@ export default class Addon extends DenaliObject {
   public dir: string;
 
   /**
-   * The list of child addons that this addon contains
-   */
-  public addons: Addon[];
-
-  /**
-   * The application logger instance
+   * The package.json for this addon
    *
    * @since 0.1.0
    */
-  protected logger: Logger;
+  public pkg: any;
 
   /**
-   * The package.json for this addon
+   * The resolver instance to use with this addon.
+   *
+   * @since 0.1.0
    */
-  public pkg: any;
+  public resolver: Resolver;
 
   /**
-   * Internal cache of the configuration that is specific to this addon
+   * The consuming application container instance
+   *
+   * @since 0.1.0
    */
-  public _config: any;
+  public container: Container;
 
   constructor(options: AddonOptions) {
     super();
     this.environment = options.environment;
     this.dir = options.dir;
+    this.pkg = options.pkg || tryRequire(findup('package.json', { cwd: this.dir }));
     this.container = options.container;
-    this.logger = options.logger;
 
-    this.pkg = options.pkg || tryRequire(findup('package.json', { cwd: this.dir }));
+    this.resolver = this.resolver || new Resolver(this.dir);
+    this.container.addResolver(this.resolver);
     this.container.register(`addon:${ this.pkg.name }@${ this.pkg.version }`, this);
-    this._config = this.loadConfig();
-  }
-
-  /**
-   * The app directory for this addon. Override to customize where the app directory is stored in
-   * your addon.
-   *
-   * @since 0.1.0
-   */
-  get appDir(): string {
-    return path.join(this.dir, 'app');
-  }
-
-  /**
-   * The config directory for this addon. Override this to customize where the config files are
-   * stored in your addon.
-   *
-   * @since 0.1.0
-   */
-  public get configDir(): string {
-    return path.join(this.dir, 'config');
   }
 
   /**
@@ -148,131 +127,6 @@ export default class Addon extends DenaliObject {
     return (this.pkg && this.pkg.name) || 'anonymous-addon';
   }
 
-  /**
-   * Load the config for this addon. The standard `config/environment.js` file is loaded by default.
-   * `config/middleware.js` and `config/routes.js` are ignored. All other userland config files are
-   * loaded into the container under their filenames.
-   *
-   * Config files are all .js files, so just the exported functions are loaded here. The functions
-   * are run later, during application initialization, to generate the actual runtime configuration.
-   */
-  protected loadConfig(): any {
-    let config = this.loadConfigFile('environment') || function() {
-      return {};
-    };
-    if (isDirectory(this.configDir)) {
-      let allConfigFiles = requireDir(this.configDir, { recurse: false });
-      let extraConfigFiles = omit(allConfigFiles, 'environment', 'middleware', 'routes');
-      forEach(extraConfigFiles, (configModule, configFilename) => {
-        let configModulename = stripExtension(configFilename);
-        this.container.register(`config:${ configModulename }`, configModule);
-      });
-    }
-    return config;
-  }
-
-  /**
-   * Load the addon's various assets. Loads child addons first, meaning that addon loading is
-   * depth-first recursive.
-   */
-  public load(): void {
-    debug(`loading ${ this.pkg.name }`);
-    this.loadInitializers();
-    this.loadMiddleware();
-    this.loadApp();
-    this.loadRoutes();
-  }
-
-  /**
-   * Load the initializers for this addon. Initializers live in `config/initializers`.
-   */
-  protected loadInitializers(): void {
-    let initializersDir = path.join(this.configDir, 'initializers');
-    if (isDirectory(initializersDir)) {
-      let initializers = requireDir(initializersDir);
-      forEach(initializers, (initializer, name) => {
-        this.container.register(`initializer:${ name }`, initializer);
-      });
-    }
-  }
-
-  /**
-   * Load the middleware for this addon. Middleware is specified in `config/middleware.js`. The file
-   * should export a function that accepts the router as it's single argument. You can then attach
-   * any middleware you'd like to that router, and it will execute before any route handling by
-   * Denali.
-   *
-   * Typically this is useful to register global middleware, i.e. a CORS handler, cookie parser,
-   * etc.
-   *
-   * If you want to run some logic before certain routes only, try using filters on your actions
-   * instead.
-   */
-  protected loadMiddleware(): void {
-    this._middleware = this.loadConfigFile('middleware') || noop;
-  }
-
-  /**
-   * The middleware factory for this addon.
-   */
-  public _middleware: (router: Router, application: Application) => void;
-
-  /**
-   * Loads the routes for this addon. Routes are defined in `config/routes.js`. The file should
-   * export a function that defines routes. See the Routing guide for details on how to define
-   * routes.
-   */
-  protected loadRoutes(): void {
-    this._routes = this.loadConfigFile('routes') || noop;
-  }
-
-  /**
-   * The routes factory for this addon.
-   */
-  public _routes: (router: Router) => void;
-
-  /**
-   * Load the app assets for this addon. These are the various classes that live under `app/`,
-   * including actions, models, etc., as well as any custom class types.
-   *
-   * Files are loaded into the container under their folder's namespace, so `app/roles/admin.js`
-   * would be registered as 'role:admin' in the container. Deeply nested folders become part of the
-   * module name, i.e. `app/roles/employees/manager.js` becomes 'role:employees/manager'.
-   *
-   * Non-JS files are loaded as well, and their container names include the extension, so
-   * `app/mailer/welcome.html` becomes `mail:welcome.html`.
-   */
-  protected loadApp(): void {
-    debug(`loading app for ${ this.pkg.name }`);
-    if (fs.existsSync(this.appDir)) {
-      eachDir(this.appDir, (dirname) => {
-        debug(`loading ${ dirname } for ${ this.pkg.name }`);
-        let dir = path.join(this.appDir, dirname);
-        let type = singularize(dirname);
-
-        glob.sync('**/*', { cwd: dir }).forEach((filepath) => {
-          let modulepath = stripExtension(filepath);
-          if (filepath.endsWith('.js')) {
-            let Class = require(path.join(dir, filepath));
-            Class = Class.default || Class;
-            this.container.register(`${ type }:${ modulepath }`, Class);
-          } else if (filepath.endsWith('.json')) {
-            let mod = require(path.join(dir, filepath));
-            this.container.register(`${ type }:${ modulepath }`, mod.default || mod);
-          }
-        });
-      });
-    }
-  }
-
-  /**
-   * Helper to load a file from the config directory
-   */
-  protected loadConfigFile(filename: string): any {
-    let configModule = tryRequire(path.join(this.configDir, `${ filename }.js`));
-    return configModule && (configModule.default || configModule);
-  }
-
   /**
    * A hook to perform any shutdown actions necessary to gracefully exit the application, i.e. close
    * database/socket connections.