Preserve input URL array order

* Implement forEachAsync
* Preserve input URL array order

Co-authored-by: kylon <kylonux@gmail.com>

src/Metadata.ts

@@ -1,4 +1,5 @@
 import { Metadata, Session } from './Types';
+import { forEachAsync } from './Utils';
 
 import { parse } from 'iso8601-duration';
 import axios from 'axios';
@@ -29,7 +30,7 @@ export async function getVideoMetadata(videoGuids: string[], session: Session, v
     let playbackUrl: string;
     let posterImage: string;
 
-    await Promise.all(videoGuids.map(async guid => {
+    await forEachAsync(videoGuids, async (guid: string) => {
         let apiUrl = `${session.ApiGatewayUri}videos/${guid}?api-version=${session.ApiGatewayVersion}`;
 
         if (verbose)
@@ -59,7 +60,7 @@ export async function getVideoMetadata(videoGuids: string[], session: Session, v
             playbackUrl: playbackUrl,
             posterImage: posterImage
         });
-    }));
-    
+    });
+
     return metadata;
 }

src/Utils.ts

@@ -46,6 +46,10 @@ function readFileToArray(path: string) {
     return fs.readFileSync(path).toString('utf-8').split(/[\r\n]/);
 }
 
+export async function forEachAsync(array: any, callback: any) {
+    for (let i=0, l=array.length; i<l; ++i)
+        await callback(array[i], i, array);
+}
 
 export function parseVideoUrls(videoUrls: any) {
     let t = videoUrls[0] as string;