Stop download functionality (#45)

app/src/page/file/index.js

@@ -9,7 +9,7 @@ import {
   selectRewardContentClaimIds,
   makeSelectCostInfoForUri
 } from 'lbry-redux';
-import { doDeleteFile } from '../../redux/actions/file';
+import { doDeleteFile, doStopDownloadingFile } from '../../redux/actions/file';
 import FilePage from './view';
 
 const select = (state, props) => {
@@ -29,6 +29,7 @@ const select = (state, props) => {
 const perform = dispatch => ({
   fetchFileInfo: uri => dispatch(doFetchFileInfo(uri)),
   fetchCostInfo: uri => dispatch(doFetchCostInfoForUri(uri)),
+  stopDownload: (uri, fileInfo) => dispatch(doStopDownloadingFile(uri, fileInfo)),
   deleteFile: (fileInfo, deleteFromDevice, abandonClaim) => {
     dispatch(doDeleteFile(fileInfo, deleteFromDevice, abandonClaim));
   },

app/src/page/file/view.js

@@ -76,6 +76,20 @@ class FilePage extends React.PureComponent {
     );
   }
   
+  onStopDownloadPressed = () => {
+    const { deleteFile, stopDownload, fileInfo, navigation } = this.props;
+    
+    Alert.alert(
+      'Stop download',
+      'Are you sure you want to stop downloading this file?',
+      [
+        { text: 'No' },
+        { text: 'Yes', onPress: () => { stopDownload(navigation.state.params.uri, fileInfo); } }
+      ],
+      { cancelable: true }
+    );
+  }
+  
   componentWillUnmount() {
     StatusBar.setHidden(false);
     if (NativeModules.ScreenOrientation) {
@@ -128,7 +142,7 @@ class FilePage extends React.PureComponent {
         { showActions &&
         <View style={filePageStyle.actions}>
           {completed && <Button color="red" title="Delete" onPress={this.onDeletePressed} />}
-          {fileInfo && !fileInfo.stopped && fileInfo.written_bytes < fileInfo.total_bytes &&
+          {!completed && fileInfo && !fileInfo.stopped && fileInfo.written_bytes < fileInfo.total_bytes &&
             <Button color="red" title="Stop Download" onPress={this.onStopDownloadPressed} />
           }
         </View>}

app/src/redux/actions/file.js

@@ -97,6 +97,30 @@ export function doStartDownload(uri, outpoint) {
   };
 }
 
+export function doStopDownloadingFile(uri, fileInfo) {
+  return dispatch  => {
+    let params = { status: 'stop' };
+    if (fileInfo.sd_hash) {
+      params.sd_hash = fileInfo.sd_hash; 
+    }
+    if (fileInfo.stream_hash) {
+      params.stream_hash = fileInfo.stream_hash;
+    }
+
+    Lbry.file_set_status(params).then(() => {
+      dispatch({
+        type: ACTIONS.DOWNLOADING_CANCELED,
+        data: {}
+      });
+    });
+    
+    NativeModules.LbryDownloadManager.stopDownload(uri, fileInfo.file_name);
+    
+    // Should also delete the file after the user stops downloading
+    dispatch(doDeleteFile(fileInfo.outpoint, uri));
+  };
+}
+
 export function doDownloadFile(uri, streamInfo) {
   return dispatch => {
     dispatch(doStartDownload(uri, streamInfo.outpoint));

src/main/java/io/lbry/lbrynet/reactmodules/DownloadManagerModule.java

@@ -75,14 +75,36 @@ public class DownloadManagerModule extends ReactContextBaseJavaModule {
         NotificationCompat.Builder builder = builders.get(notificationId);
         builder.setProgress(MAX_PROGRESS, new Double(progress).intValue(), false);
         builder.setContentText(String.format("%.0f%% (%s / %s)", progress, formatBytes(writtenBytes), formatBytes(totalBytes)));
+        builder.setOngoing(true);
         notificationManager.notify(notificationId, builder.build());
 
         if (progress == MAX_PROGRESS) {
             builder.setContentTitle(String.format("Downloaded %s.", fileName));
+            builder.setOngoing(false);
             downloadIdNotificationIdMap.remove(id);
             builders.remove(notificationId);
         }
     }
+    
+    @ReactMethod
+    public void stopDownload(String id, String filename) {
+        if (!downloadIdNotificationIdMap.containsKey(id)) {
+            return;
+        }
+
+        int notificationId = downloadIdNotificationIdMap.get(id);
+        if (!builders.containsKey(notificationId)) {
+            return;
+        }
+        
+        NotificationManagerCompat notificationManager = NotificationManagerCompat.from(context);
+        NotificationCompat.Builder builder = builders.get(notificationId);
+        builder.setOngoing(false);
+        notificationManager.cancel(notificationId);
+
+        downloadIdNotificationIdMap.remove(id);
+        builders.remove(notificationId);
+    }
 
     private String formatBytes(double bytes)
     {