Restart downloads upon re-opening the application

packages/app/app/App.js

@@ -19,6 +19,7 @@ import * as ConnectivityActions from './actions/connectivity';
 import * as GithubContribActions from './actions/githubContrib';
 import * as WindowActions from './actions/window';
 import * as NuclearConfigActions from './actions/nuclear/configuration';
+import * as DownloadActions from './actions/downloads';
 
 import './app.global.scss';
 import styles from './styles.scss';
@@ -64,6 +65,7 @@ class App extends React.PureComponent {
     this.props.actions.githubContribInfo();
     this.props.actions.fetchNuclearConfiguration();
     this.props.actions.fetchNuclearParams();
+    this.props.actions.resumeDownloads();
 
     this.updateConnectivityStatus(navigator.onLine);
     window.addEventListener('online', () => this.updateConnectivityStatus(true));
@@ -198,7 +200,8 @@ function mapDispatchToProps(dispatch) {
         SearchActions,
         GithubContribActions,
         WindowActions,
-        NuclearConfigActions
+        NuclearConfigActions,
+        DownloadActions
       ),
       dispatch
     )

packages/app/app/actions/actionTypes.ts

@@ -152,6 +152,7 @@ export enum Equalizer {
 export enum Download {
   READ_DOWNLOADS = 'READ_DOWNLOADS',
   ADD_TO_DOWNLOADS = 'ADD_TO_DOWNLOADS',
+  RESUME_DOWNLOADS = 'RESUME_DOWNLOADS',
   DOWNLOAD_STARTED = 'DOWNLOAD_STARTED',
   DOWNLOAD_PAUSED = 'DOWNLOAD_PAUSED',
   DOWNLOAD_RESUMED = 'DOWNLOAD_RESUMED',

packages/app/app/actions/downloads.ts

@@ -101,8 +101,15 @@ export const onDownloadResume = createStandardAction(DownloadActionTypes.DOWNLOA
 
 export const onDownloadProgress = createStandardAction(DownloadActionTypes.DOWNLOAD_PROGRESS).map(
   (uuid: string, progress: number) => {
-    const downloads = store.get('downloads');
-    let payload = changePropertyForItem({
+    const downloads: Download[] = store.get('downloads');
+    const track = downloads.find((item) => item.track.uuid === uuid);
+    if (track === undefined) {
+      // track is no longer in downloads, so nothing can be updated
+      return {
+        payload: downloads
+      };
+    }
+    let payload: Download[] = changePropertyForItem({
       downloads,
       uuid,
       propertyName: 'completion',
@@ -172,3 +179,19 @@ export const clearFinishedDownloads = createStandardAction(DownloadActionTypes.C
       payload: filteredTracks
     };
   });
+
+export const resumeDownloads = createStandardAction(DownloadActionTypes.RESUME_DOWNLOADS).map(
+  () => {
+    const downloads: Download[] = store.get('downloads');
+    const startedItem = downloads.find((item) => item.status === DownloadStatus.STARTED);
+    let payload = downloads;
+    if (startedItem !== undefined) {
+      payload = changePropertyForItem({
+        downloads,
+        uuid: startedItem.track.uuid,
+        value: DownloadStatus.WAITING
+      });
+    }
+    return  { payload, type: DownloadActionTypes.RESUME_DOWNLOADS };
+  } 
+);

packages/app/app/reducers/downloads.ts

@@ -15,6 +15,7 @@ export default function DownloadsReducer(state=initialState, action: DownloadRed
   case getType(DownloadActions.onDownloadResume):
   case getType(DownloadActions.onDownloadPause):
     return [...action.payload.downloads];
+  case getType(DownloadActions.resumeDownloads):
   case getType(DownloadActions.readDownloads):
   case getType(DownloadActions.onDownloadStarted):
   case getType(DownloadActions.onDownloadProgress):

packages/app/app/store/middlewares/ipc.ts

@@ -120,6 +120,7 @@ const ipcConnect: Middleware = () => next => {
       ipcRenderer.send(IpcEvents.DOWNLOAD_PAUSE, track);
       break;
     }
+    case getType(DownloadActions.resumeDownloads):
     case getType(DownloadActions.onDownloadFinished):
     case getType(DownloadActions.onDownloadError): {
       const nextDownload = payload.find((download) =>