Add support for app defined services

TODO.txt

@@ -1,7 +1,6 @@
 static assets
 middleware
 view engine
-user-defined services
 internationalization
 uploads & universal path
 CLI - view routes, template generation, start server, directives, output, args

app/bundle/daton_units.ts

@@ -7,3 +7,4 @@ export { default as HttpKernelUnit } from '../../lib/src/unit/HttpKernel.ts'
 export { default as ModelsUnit } from '../../orm/src/ModelsUnit.ts'
 export { default as HttpServerUnit } from '../../lib/src/unit/HttpServer.ts'
 export { default as RoutingUnit } from '../../lib/src/unit/Routing.ts'
+export { default as ServicesUnit } from '../../lib/src/unit/Services.ts'

app/units.ts

@@ -7,10 +7,12 @@ import {
     HttpKernelUnit,
     ModelsUnit,
     HttpServerUnit,
-    RoutingUnit
+    RoutingUnit,
+    ServicesUnit,
 } from './bundle/daton_units.ts'
 
 export default [
+    ServicesUnit,
     ConfigUnit,
     DatabaseUnit,
     ModelsUnit,

lib/src/service/ServiceProvider.ts

@@ -0,0 +1,6 @@
+import AppClass from '../lifecycle/AppClass.ts'
+export { Service } from '../../../di/src/decorator/Service.ts'
+
+export class ServiceProvider extends AppClass {
+
+}

lib/src/unit/Services.ts

@@ -0,0 +1,18 @@
+import {InstantiableCanonical} from './InstantiableCanonical.ts'
+import {ServiceProvider} from '../service/ServiceProvider.ts'
+import {CanonicalDefinition} from './Canonical.ts'
+
+export default class Services extends InstantiableCanonical<ServiceProvider> {
+    protected base_path = './app/services'
+    protected canonical_item = 'service'
+    protected suffix = '.service.ts'
+
+    public async init_canonical_item(def: CanonicalDefinition) {
+        const item = await super.init_canonical_item(def)
+        if ( !(item instanceof ServiceProvider) ) {
+            throw new TypeError(`Invalid service provider definition: ${def.original_name}. Service providers must extend from Daton's base ServiceProvider class.`)
+        }
+
+        return item
+    }
+}