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Improve DocumentsProvider implementation

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The initial goal was to make all operations completely synchronous,
so failures can be detected by apps using our DocumentsProvider.

However, `#openDocument()` could not be made fully synchronous,
because we need to wait for the ParcelFileDescriptor we are returning to
close before we can upload a file.
Nextcloud works with locally cached files that only get synchronized to
remote storage.

Things I have tried:

* Use the Handler from the calling I/O Thread:
  not guaranteed to have a prepared Looper,
  so can't always create Handler on that Thread
* Extend ParcelFileDescriptor and override its close() methods:
  For some reason they don't get called when the stream gets closed
* notify the content URI when the upload is complete,
  so callers can wait for the notification:
  works, but is non-standard.
  Other DPs are not doing it,
  so it requires Nextcloud specific code on caller side
  and is still hacky:
  what happens if notification doesn't come? Timeout, but for how long?
* use other ways to get a ParcelFileDescriptor on the file:
  couldn't find anything that would interface with Nextcloud's
  current architecture

Signed-off-by: Torsten Grote <t@grobox.de>
This commit is contained in:
Torsten Grote 2020-08-20 17:23:44 -03:00
parent da2352974c
commit 1fdea37c2b
No known key found for this signature in database
GPG key ID: 3E5F77D92CF891FF
3 changed files with 114 additions and 93 deletions
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3
src/main/java/com/owncloud/android/files/services/FileDownloader.java
View file

@ -40,6 +40,7 @@ import android.util.Pair;
import com.nextcloud.client.account.User;
import com.nextcloud.client.account.UserAccountManager;
import com.nextcloud.client.files.downloader.DownloadTask;
import com.owncloud.android.R;
import com.owncloud.android.authentication.AuthenticatorActivity;
import com.owncloud.android.datamodel.FileDataStorageManager;
@ -55,6 +56,7 @@ import com.owncloud.android.lib.common.operations.RemoteOperationResult.ResultCo
import com.owncloud.android.lib.common.utils.Log_OC;
import com.owncloud.android.lib.resources.files.FileUtils;
import com.owncloud.android.operations.DownloadFileOperation;
import com.owncloud.android.providers.DocumentsStorageProvider;
import com.owncloud.android.ui.activity.FileActivity;
import com.owncloud.android.ui.activity.FileDisplayActivity;
import com.owncloud.android.ui.dialog.SendShareDialog;
@ -495,6 +497,7 @@ public class FileDownloader extends Service
* Updates the OC File after a successful download.
*
* TODO move to DownloadFileOperation
* unify with code from {@link DocumentsStorageProvider} and {@link DownloadTask}.
*/
private void saveDownloadedFile() {
OCFile file = mStorageManager.getFileById(mCurrentDownload.getFile().getFileId());

4
src/main/java/com/owncloud/android/operations/UploadFileOperation.java
View file

@ -1287,6 +1287,10 @@ public class UploadFileOperation extends SyncOperation {
if (file.fileExists()) {
file = getStorageManager().getFileById(file.getFileId());
}
if (file == null) {
// this can happen e.g. when the file gets deleted during upload
return;
}
long syncDate = System.currentTimeMillis();
file.setLastSyncDateForData(syncDate);

196
src/main/java/com/owncloud/android/providers/DocumentsStorageProvider.java
View file

@ -29,7 +29,6 @@ import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.content.ContentResolver;
import android.content.Context;
import android.content.Intent;
import android.content.res.AssetFileDescriptor;
import android.database.Cursor;
import android.graphics.Point;
@ -39,17 +38,16 @@ import android.os.Build;
import android.os.Bundle;
import android.os.CancellationSignal;
import android.os.Handler;
import android.os.Looper;
import android.os.ParcelFileDescriptor;
import android.provider.DocumentsContract;
import android.provider.DocumentsProvider;
import android.util.Log;
import android.util.SparseArray;
import android.widget.Toast;
import com.nextcloud.client.account.User;
import com.nextcloud.client.account.UserAccountManager;
import com.nextcloud.client.account.UserAccountManagerImpl;
import com.nextcloud.client.files.downloader.DownloadTask;
import com.nextcloud.client.preferences.AppPreferences;
import com.nextcloud.client.preferences.AppPreferencesImpl;
import com.owncloud.android.MainApp;
@ -59,6 +57,8 @@ import com.owncloud.android.datamodel.FileDataStorageManager;
import com.owncloud.android.datamodel.OCFile;
import com.owncloud.android.datamodel.ThumbnailsCacheManager;
import com.owncloud.android.files.services.FileDownloader;
import com.owncloud.android.files.services.FileUploader;
import com.owncloud.android.files.services.FileUploader.NameCollisionPolicy;
import com.owncloud.android.lib.common.OwnCloudAccount;
import com.owncloud.android.lib.common.OwnCloudClient;
import com.owncloud.android.lib.common.OwnCloudClientManagerFactory;
@ -67,14 +67,15 @@ import com.owncloud.android.lib.common.utils.Log_OC;
import com.owncloud.android.lib.resources.files.UploadFileRemoteOperation;
import com.owncloud.android.operations.CopyFileOperation;
import com.owncloud.android.operations.CreateFolderOperation;
import com.owncloud.android.operations.DownloadFileOperation;
import com.owncloud.android.operations.MoveFileOperation;
import com.owncloud.android.operations.RefreshFolderOperation;
import com.owncloud.android.operations.RemoveFileOperation;
import com.owncloud.android.operations.RenameFileOperation;
import com.owncloud.android.operations.SynchronizeFileOperation;
import com.owncloud.android.ui.activity.ConflictsResolveActivity;
import com.owncloud.android.ui.activity.SettingsActivity;
import com.owncloud.android.utils.FileStorageUtils;
import com.owncloud.android.utils.MimeTypeUtil;
import com.owncloud.android.utils.UriUtils;
import org.nextcloud.providers.cursors.FileCursor;
@ -90,8 +91,11 @@ import java.util.concurrent.Executor;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import androidx.annotation.NonNull;
import static com.owncloud.android.datamodel.OCFile.PATH_SEPARATOR;
import static com.owncloud.android.datamodel.OCFile.ROOT_PATH;
import static com.owncloud.android.files.services.FileUploader.LOCAL_BEHAVIOUR_MOVE;
@TargetApi(Build.VERSION_CODES.KITKAT)
public class DocumentsStorageProvider extends DocumentsProvider {
@ -192,108 +196,100 @@ public class DocumentsStorageProvider extends DocumentsProvider {
Document document = toDocument(documentId);
Context context = getContext();
if (context == null) {
throw new FileNotFoundException("Context may not be null!");
}
Context context = getNonNullContext();
OCFile ocFile = document.getFile();
Account account = document.getAccount();
final User user = accountManager.getUser(account.name).orElseThrow(RuntimeException::new); // should exist
if (!ocFile.isDown()) {
Intent i = new Intent(getContext(), FileDownloader.class);
i.putExtra(FileDownloader.EXTRA_USER, user);
i.putExtra(FileDownloader.EXTRA_FILE, ocFile);
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
context.startForegroundService(i);
} else {
context.startService(i);
}
do {
if (!waitOrGetCancelled(cancellationSignal)) {
throw new FileNotFoundException("File with id " + documentId + " not found!");
}
ocFile = document.getFile();
if (ocFile == null) {
throw new FileNotFoundException("File with id " + documentId + " not found!");
}
} while (!ocFile.isDown());
} else {
OCFile finalFile = ocFile;
Thread syncThread = new Thread(() -> {
if (ocFile.isDown()) {
RemoteOperationResult result;
try {
FileDataStorageManager storageManager = new FileDataStorageManager(user.toPlatformAccount(),
context.getContentResolver());
RemoteOperationResult result = new SynchronizeFileOperation(finalFile, null, user,
true, context)
.execute(storageManager, context);
if (result.getCode() == RemoteOperationResult.ResultCode.SYNC_CONFLICT) {
// ISSUE 5: if the user is not running the app (this is a service!),
// this can be very intrusive; a notification should be preferred
Intent intent = ConflictsResolveActivity.createIntent(finalFile,
user.toPlatformAccount(),
Intent.FLAG_ACTIVITY_NEW_TASK,
context);
context.startActivity(intent);
} else {
FileStorageUtils.checkIfFileFinishedSaving(finalFile);
if (!result.isSuccess()) {
showToast();
}
}
result = new SynchronizeFileOperation(ocFile, null, user, true, context)
.execute(document.getClient(), document.getStorageManager());
} catch (Exception e) {
Log_OC.e(TAG, "Error syncing file", e);
showToast();
throw getFileNotFoundExceptionWithCause("Error synchronizing file: " + ocFile.getFileName(), e);
}
});
syncThread.start();
try {
syncThread.join();
} catch (InterruptedException e) {
Log.e(TAG, "Failed to wait for thread to finish", e);
if (result.getCode() == RemoteOperationResult.ResultCode.SYNC_CONFLICT) {
// TODO show a conflict notification with a pending intent that shows a ConflictResolveDialog
Log_OC.w(TAG, "Conflict found: " + result);
} else if (!result.isSuccess()) {
Log_OC.e(TAG, result.toString());
throw new FileNotFoundException("Error synchronizing file: " + ocFile.getFileName());
}
// TODO test if this needed here
// block thread until file is saved
FileStorageUtils.checkIfFileFinishedSaving(ocFile);
} else {
DownloadFileOperation downloadFileOperation = new DownloadFileOperation(account, ocFile, context);
RemoteOperationResult result = downloadFileOperation.execute(document.getClient());
if (!result.isSuccess()) {
Log_OC.e(TAG, result.toString());
throw new FileNotFoundException("Error downloading file: " + ocFile.getFileName());
}
saveDownloadedFile(document.getStorageManager(), downloadFileOperation, ocFile);
}
File file = new File(ocFile.getStoragePath());
int accessMode = ParcelFileDescriptor.parseMode(mode);
boolean isWrite = mode.indexOf('w') != -1;
final OCFile oldFile = ocFile;
final OCFile newFile = ocFile;
boolean isWrite = accessMode != ParcelFileDescriptor.MODE_READ_ONLY;
if (isWrite) {
try {
// reset last sync date to ensure we will be syncing this write to the server
ocFile.setLastSyncDateForData(0);
// The calling thread is not guaranteed to have a Looper, so we can't block it with the OnCloseListener.
// Thus, we are unable to do a synchronous upload and have to start an asynchronous one.
Handler handler = new Handler(context.getMainLooper());
return ParcelFileDescriptor.open(file, accessMode, handler, l -> {
RemoteOperationResult result = new SynchronizeFileOperation(newFile, oldFile, user, true,
context)
.execute(document.getClient(), document.getStorageManager());
try {
return ParcelFileDescriptor.open(file, accessMode, handler, error -> {
if (error == null) { // no error
// As we can't upload the file synchronously, let's at least update its metadata here already.
ocFile.setFileLength(file.length());
ocFile.setModificationTimestamp(System.currentTimeMillis());
document.getStorageManager().saveFile(ocFile);
boolean success = result.isSuccess();
if (!success) {
Log_OC.e(TAG, "Failed to update document with id " + documentId);
// TODO disable upload notifications as DocumentsProvider users already show them
// upload file with FileUploader service (off main thread)
FileUploader.uploadUpdateFile(
context,
account,
ocFile,
LOCAL_BEHAVIOUR_MOVE,
NameCollisionPolicy.OVERWRITE
);
} else { // error, no upload needed
Log_OC.e(TAG, "File was closed with an error: " + ocFile.getFileName(), error);
}
});
} catch (IOException e) {
throw new FileNotFoundException("Failed to open/edit document with id " + documentId);
throw new FileNotFoundException("Failed to open document for writing " + ocFile.getFileName());
}
} else {
return ParcelFileDescriptor.open(file, accessMode);
}
}
private void showToast() {
Handler handler = new Handler(Looper.getMainLooper());
handler.post(() -> Toast.makeText(MainApp.getAppContext(),
R.string.file_not_synced,
Toast.LENGTH_SHORT).show());
/**
* Updates the OC File after a successful download.
*
* TODO unify with code from {@link FileDownloader} and {@link DownloadTask}.
*/
private void saveDownloadedFile(FileDataStorageManager storageManager, DownloadFileOperation dfo, OCFile file) {
long syncDate = System.currentTimeMillis();
file.setLastSyncDateForProperties(syncDate);
file.setLastSyncDateForData(syncDate);
file.setUpdateThumbnailNeeded(true);
file.setModificationTimestamp(dfo.getModificationTimestamp());
file.setModificationTimestampAtLastSyncForData(dfo.getModificationTimestamp());
file.setEtag(dfo.getEtag());
file.setMimeType(dfo.getMimeType());
String savePath = dfo.getSavePath();
file.setStoragePath(savePath);
file.setFileLength(new File(savePath).length());
file.setRemoteId(dfo.getFile().getRemoteId());
storageManager.saveFile(file);
if (MimeTypeUtil.isMedia(dfo.getMimeType())) {
FileDataStorageManager.triggerMediaScan(file.getStoragePath(), file);
}
storageManager.saveConflict(file, null);
}
@Override
@ -349,6 +345,7 @@ public class DocumentsStorageProvider extends DocumentsProvider {
.execute(document.getClient(), document.getStorageManager());
if (!result.isSuccess()) {
Log_OC.e(TAG, result.toString());
throw new FileNotFoundException("Failed to rename document with documentId " + documentId + ": " +
result.getException());
}
@ -376,6 +373,7 @@ public class DocumentsStorageProvider extends DocumentsProvider {
.execute(document.getClient(), storageManager);
if (!result.isSuccess()) {
Log_OC.e(TAG, result.toString());
throw new FileNotFoundException("Failed to copy document with documentId " + sourceDocumentId
+ " to " + targetParentDocumentId);
}
@ -388,6 +386,7 @@ public class DocumentsStorageProvider extends DocumentsProvider {
.execute(targetFolder.getClient());
if (!updateParent.isSuccess()) {
Log_OC.e(TAG, updateParent.toString());
throw new FileNotFoundException("Failed to copy document with documentId " + sourceDocumentId
+ " to " + targetParentDocumentId);
}
@ -421,6 +420,7 @@ public class DocumentsStorageProvider extends DocumentsProvider {
.execute(document.getClient(), document.getStorageManager());
if (!result.isSuccess()) {
Log_OC.e(TAG, result.toString());
throw new FileNotFoundException("Failed to move document with documentId " + sourceDocumentId
+ " to " + targetParentDocumentId);
}
@ -481,6 +481,7 @@ public class DocumentsStorageProvider extends DocumentsProvider {
.execute(targetFolder.getClient(), storageManager);
if (!result.isSuccess()) {
Log_OC.e(TAG, result.toString());
throw new FileNotFoundException("Failed to create document with name " +
displayName + " and documentId " + targetFolder.getDocumentId());
}
@ -491,6 +492,7 @@ public class DocumentsStorageProvider extends DocumentsProvider {
.execute(targetFolder.getClient());
if (!updateParent.isSuccess()) {
Log_OC.e(TAG, updateParent.toString());
throw new FileNotFoundException("Failed to create document with documentId " + targetFolder.getDocumentId());
}
@ -527,7 +529,7 @@ public class DocumentsStorageProvider extends DocumentsProvider {
throw new FileNotFoundException("File could not be created");
}
} catch (IOException e) {
throw new FileNotFoundException("File could not be created");
throw getFileNotFoundExceptionWithCause("File could not be created", e);
}
String newFilePath = targetFolder.getRemotePath() + displayName;
@ -542,6 +544,7 @@ public class DocumentsStorageProvider extends DocumentsProvider {
.execute(client);
if (!result.isSuccess()) {
Log_OC.e(TAG, result.toString());
throw new FileNotFoundException("Failed to upload document with path " + newFilePath);
}
@ -556,6 +559,7 @@ public class DocumentsStorageProvider extends DocumentsProvider {
.execute(client);
if (!updateParent.isSuccess()) {
Log_OC.e(TAG, updateParent.toString());
throw new FileNotFoundException("Failed to create document with documentId " + targetFolder.getDocumentId());
}
@ -649,6 +653,12 @@ public class DocumentsStorageProvider extends DocumentsProvider {
return false;
}
private FileNotFoundException getFileNotFoundExceptionWithCause(String msg, Exception cause) {
FileNotFoundException e = new FileNotFoundException(msg);
e.initCause(cause);
return e;
}
private FileDataStorageManager getStorageManager(String rootId) {
for(int i = 0; i < rootIdToStorageManager.size(); i++) {
FileDataStorageManager storageManager = rootIdToStorageManager.valueAt(i);
@ -672,16 +682,6 @@ public class DocumentsStorageProvider extends DocumentsProvider {
}
}
private boolean waitOrGetCancelled(CancellationSignal cancellationSignal) {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
return false;
}
return !(cancellationSignal != null && cancellationSignal.isCanceled());
}
private List<Document> findFiles(Document root, String query) {
FileDataStorageManager storageManager = root.getStorageManager();
List<Document> result = new ArrayList<>();
@ -715,6 +715,20 @@ public class DocumentsStorageProvider extends DocumentsProvider {
return new Document(storageManager, Long.parseLong(separated[1]));
}
/**
* Returns a {@link Context} guaranteed to be non-null.
*
* @throws IllegalStateException if called before {@link #onCreate()}.
*/
@NonNull
private Context getNonNullContext() {
Context context = getContext();
if (context == null) {
throw new IllegalStateException();
}
return context;
}
public interface OnTaskFinishedCallback {
void onTaskFinished(RemoteOperationResult result);
}