refactor according to the report

src/api/interface.ts

@@ -1,14 +1,18 @@
-export default interface Client {
+export default interface Resource {
 
+	/** Define the Resource query and returns whether it is valid
+	 *
+	 * @param query				the query composing the request
+	 * @returns valid			the validity of the received (true = valid)
+	 */
 	feed_query(query: object|string) : boolean;
 
-	/** Processes an API call to the given resource and returns a Promise resolving with the output object
-	 * or rejecting the Error
-	 *
-	 * @param query			represents the input data composing the request
-	 */
+	/* Returns a promise resolving on the output data and rejecting the error if any */
 	get_all() : Promise<object>[];
 
+	/* Returns a promise resolving on the output data of the element <i> and rejecting the error if any */
 	get(i: number) : Promise<object>;
 
 }
+
+

src/api/items.ts

@@ -1,10 +1,10 @@
-import Client from "./interface";
+import Resource from "./interface";
 import Key from "./keys";
 import { request } from 'https';
 import { printf, pad, reprintf } from "../std/printf";
 import { extract } from "../std/extract";
 
-export default class CarrefourItems implements Client {
+export default class CarrefourItems implements Resource {
 
 	static host: string = 'api.fr.carrefour.io';
 	static uri: string  = '/v1/openapi/items';

src/api/off.ts

@@ -1,11 +1,11 @@
-import Client from "./interface";
+import Resource from "./interface";
 import Key from "./keys";
 import { request } from 'https';
 import { printf, pad, reprintf } from "../std/printf";
 import { extract } from "../std/extract";
 import { join } from "path";
 
-export default class OpenFoodFacts implements Client {
+export default class OpenFoodFacts implements Resource {
 
 	static host: string = 'world.openfoodfacts.org';
 	static uri: string  = '/api/v0/product/';

src/main.ts

@@ -1,13 +1,18 @@
 import { createServer } from 'http'
 import { Socket } from 'net';
-import Mixer from './mixer'
+import Multiplexer from './multiplexer'
 import { printf } from './std/printf';
+import CarrefourItems from './api/items';
+import OpenFoodFacts from './api/off';
 
 
-const mixer: Mixer = new Mixer();
+const multiplexer: Multiplexer = new Multiplexer(
+	new CarrefourItems(),
+	new OpenFoodFacts()
+);
 
 // 1. build server
-const server = createServer(mixer.http_handler.bind(mixer));
+const server = createServer(multiplexer.http_handler.bind(multiplexer));
 
 // 2. bind 404 error
 server.on('clientError', (err: Error, sock: Socket) => {

src/multiplexer.ts

@@ -2,18 +2,18 @@ import { IncomingMessage, ServerResponse, Server } from "http";
 import CarrefourItems from "./api/items";
 import { parse as parseURL, UrlWithParsedQuery } from "url";
 import { ParsedUrlQuery } from "querystring";
-import Client from "./api/interface";
+import Resource from "./api/interface";
 import { printf, pad } from "./std/printf";
 import OpenFoodFacts from "./api/off";
 
-export default class Mixer {
+export default class Multiplexer {
 
 	static valid_urls = ["/"];
+	stack: Resource[];
 
-	chain: Client[] = [new CarrefourItems(), new OpenFoodFacts()];
-
-	constructor(){
-		printf('+ mixer')
+	constructor(...res : Resource[]){
+		printf('+ multiplexer')
+		this.stack = res
 		pad('loaded\n');
 	}
 
@@ -30,8 +30,8 @@ export default class Mixer {
 		let urlObj : UrlWithParsedQuery = parseURL(req.url, true)
 
 		// reject invalid requests
-		if( req.method != 'GET' )                                return Mixer.http_error(res, 'only GET method allowed');
-		else if( Mixer.valid_urls.indexOf(urlObj.pathname) < 0 ) return Mixer.http_error(res, `only URI [${Mixer.valid_urls}] allowed`);
+		if( req.method != 'GET' )                                return Multiplexer.http_error(res, 'only GET method allowed');
+		else if( Multiplexer.valid_urls.indexOf(urlObj.pathname) < 0 ) return Multiplexer.http_error(res, `only URI [${Multiplexer.valid_urls}] allowed`);
 
 		printf('\n  -- new request --\n')
 		try{
@@ -67,16 +67,16 @@ export default class Mixer {
 		let query: ParsedUrlQuery = parseURL(req.url,true).query
 		let out:   any[]          = [];
 
-		for( let i = 0 ; i < this.chain.length ; i++ ){
+		for( let resource of this.stack ){
 
-			let input = (i<1) ? query : out[i-1];
+			let input = out.length<1 ? query : out[out.length-1];
 
 			try{
 
-				if( !this.chain[i].feed_query(input) )
-					throw new Error(`invalid query for api ${i}`)
+				if( !resource.feed_query(input) )
+					throw new Error(`invalid query for resource ${out.length}`)
 
-				out[i] = await Promise.all( this.chain[i].get_all() );
+				out.push( await Promise.all(resource.get_all()) );
 
 			}catch(e){
 				printf('  ! failure \t\t\t(%s)\n', e.message);