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/*
* Copyright (C) 2009 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.internal.backup;
import android.app.backup.RestoreDescription;
import android.app.backup.RestoreSet;
import android.content.Intent;
import android.content.pm.PackageInfo;
import android.os.ParcelFileDescriptor;
/** {@hide} */
interface IBackupTransport {
/**
* Ask the transport for the name under which it should be registered. This will
* typically be its host service's component name, but need not be.
*/
String name();
/**
* Ask the transport for an Intent that can be used to launch any internal
* configuration Activity that it wishes to present. For example, the transport
* may offer a UI for allowing the user to supply login credentials for the
* transport's off-device backend.
*
* If the transport does not supply any user-facing configuration UI, it should
* return null from this method.
*
* @return An Intent that can be passed to Context.startActivity() in order to
* launch the transport's configuration UI. This method will return null
* if the transport does not offer any user-facing configuration UI.
*/
Intent configurationIntent();
/**
* On demand, supply a one-line string that can be shown to the user that
* describes the current backend destination. For example, a transport that
* can potentially associate backup data with arbitrary user accounts should
* include the name of the currently-active account here.
*
* @return A string describing the destination to which the transport is currently
* sending data. This method should not return null.
*/
String currentDestinationString();
/**
* Ask the transport for an Intent that can be used to launch a more detailed
* secondary data management activity. For example, the configuration intent might
* be one for allowing the user to select which account they wish to associate
* their backups with, and the management intent might be one which presents a
* UI for managing the data on the backend.
*
* In the Settings UI, the configuration intent will typically be invoked
* when the user taps on the preferences item labeled with the current
* destination string, and the management intent will be placed in an overflow
* menu labelled with the management label string.
*
*
If the transport does not supply any user-facing data management
* UI, then it should return {@code null} from this method.
*
* @return An intent that can be passed to Context.startActivity() in order to
* launch the transport's data-management UI. This method will return
* {@code null} if the transport does not offer any user-facing data
* management UI.
*/
Intent dataManagementIntent();
/**
* On demand, supply a short string that can be shown to the user as the label
* on an overflow menu item used to invoked the data management UI.
*
* @return A string to be used as the label for the transport's data management
* affordance. If the transport supplies a data management intent, this
* method must not return {@code null}.
*/
String dataManagementLabel();
/**
* Ask the transport where, on local device storage, to keep backup state blobs.
* This is per-transport so that mock transports used for testing can coexist with
* "live" backup services without interfering with the live bookkeeping. The
* returned string should be a name that is expected to be unambiguous among all
* available backup transports; the name of the class implementing the transport
* is a good choice.
*
* @return A unique name, suitable for use as a file or directory name, that the
* Backup Manager could use to disambiguate state files associated with
* different backup transports.
*/
String transportDirName();
/**
* Verify that this is a suitable time for a backup pass. This should return zero
* if a backup is reasonable right now, some positive value otherwise. This method
* will be called outside of the {@link #startSession}/{@link #endSession} pair.
*
*
If this is not a suitable time for a backup, the transport should return a
* backoff delay, in milliseconds, after which the Backup Manager should try again.
*
* @return Zero if this is a suitable time for a backup pass, or a positive time delay
* in milliseconds to suggest deferring the backup pass for a while.
*/
long requestBackupTime();
/**
* Initialize the server side storage for this device, erasing all stored data.
* The transport may send the request immediately, or may buffer it. After
* this is called, {@link #finishBackup} must be called to ensure the request
* is sent and received successfully.
*
* @return One of {@link BackupConstants#TRANSPORT_OK} (OK so far) or
* {@link BackupConstants#TRANSPORT_ERROR} (on network error or other failure).
*/
int initializeDevice();
/**
* Send one application's data to the backup destination. The transport may send
* the data immediately, or may buffer it. After this is called, {@link #finishBackup}
* must be called to ensure the data is sent and recorded successfully.
*
* @param packageInfo The identity of the application whose data is being backed up.
* This specifically includes the signature list for the package.
* @param data The data stream that resulted from invoking the application's
* BackupService.doBackup() method. This may be a pipe rather than a file on
* persistent media, so it may not be seekable.
* @param wipeAllFirst When true, all backed-up data for the current device/account
* will be erased prior to the storage of the data provided here. The purpose of this
* is to provide a guarantee that no stale data exists in the restore set when the
* device begins providing backups.
* @return one of {@link BackupConstants#TRANSPORT_OK} (OK so far),
* {@link BackupConstants#TRANSPORT_ERROR} (on network error or other failure), or
* {@link BackupConstants#TRANSPORT_NOT_INITIALIZED} (if the backend dataset has
* become lost due to inactive expiry or some other reason and needs re-initializing)
*/
int performBackup(in PackageInfo packageInfo, in ParcelFileDescriptor inFd);
/**
* Erase the give application's data from the backup destination. This clears
* out the given package's data from the current backup set, making it as though
* the app had never yet been backed up. After this is called, {@link finishBackup}
* must be called to ensure that the operation is recorded successfully.
*
* @return the same error codes as {@link #performBackup}.
*/
int clearBackupData(in PackageInfo packageInfo);
/**
* Finish sending application data to the backup destination. This must be
* called after {@link #performBackup} or {@link clearBackupData} to ensure that
* all data is sent. Only when this method returns true can a backup be assumed
* to have succeeded.
*
* @return the same error codes as {@link #performBackup}.
*/
int finishBackup();
/**
* Get the set of all backups currently available over this transport.
*
* @return Descriptions of the set of restore images available for this device,
* or null if an error occurred (the attempt should be rescheduled).
**/
RestoreSet[] getAvailableRestoreSets();
/**
* Get the identifying token of the backup set currently being stored from
* this device. This is used in the case of applications wishing to restore
* their last-known-good data.
*
* @return A token that can be passed to {@link #startRestore}, or 0 if there
* is no backup set available corresponding to the current device state.
*/
long getCurrentRestoreSet();
/**
* Start restoring application data from backup. After calling this function,
* alternate calls to {@link #nextRestorePackage} and {@link #nextRestoreData}
* to walk through the actual application data.
*
* @param token A backup token as returned by {@link #getAvailableRestoreSets}
* or {@link #getCurrentRestoreSet}.
* @param packages List of applications to restore (if data is available).
* Application data will be restored in the order given.
* @return One of {@link BackupConstants#TRANSPORT_OK} (OK so far, call
* {@link #nextRestorePackage}) or {@link BackupConstants#TRANSPORT_ERROR}
* (an error occurred, the restore should be aborted and rescheduled).
*/
int startRestore(long token, in PackageInfo[] packages);
/**
* Get the package name of the next application with data in the backup store, plus
* a description of the structure of the restored archive: either TYPE_KEY_VALUE for
* an original-API key/value dataset, or TYPE_FULL_STREAM for a tarball-type archive stream.
*
*
If the package name in the returned RestoreDescription object is the singleton
* {@link RestoreDescription#NO_MORE_PACKAGES}, it indicates that no further data is available
* in the current restore session: all packages described in startRestore() have been
* processed.
*
*
If this method returns {@code null}, it means that a transport-level error has
* occurred and the entire restore operation should be abandoned.
*
* @return A RestoreDescription object containing the name of one of the packages
* supplied to {@link #startRestore} plus an indicator of the data type of that
* restore data; or {@link RestoreDescription#NO_MORE_PACKAGES} to indicate that
* no more packages can be restored in this session; or {@code null} to indicate
* a transport-level error.
*/
RestoreDescription nextRestorePackage();
/**
* Get the data for the application returned by {@link #nextRestorePackage}.
* @param data An open, writable file into which the backup data should be stored.
* @return the same error codes as {@link #startRestore}.
*/
int getRestoreData(in ParcelFileDescriptor outFd);
/**
* End a restore session (aborting any in-process data transfer as necessary),
* freeing any resources and connections used during the restore process.
*/
void finishRestore();
// full backup stuff
long requestFullBackupTime();
int performFullBackup(in PackageInfo targetPackage, in ParcelFileDescriptor socket);
int sendBackupData(int numBytes);
void cancelFullBackup();
// full restore stuff
/**
* Ask the transport to provide data for the "current" package being restored. This
* is the package that was just reported by {@link #nextRestorePackage()} as having
* {@link RestoreDescription#TYPE_FULL_STREAM} data.
*
* The transport writes some data to the socket supplied to this call, and returns
* the number of bytes written. The system will then read that many bytes and
* stream them to the application's agent for restore, then will call this method again
* to receive the next chunk of the archive. This sequence will be repeated until the
* transport returns zero indicating that all of the package's data has been delivered
* (or returns a negative value indicating some sort of hard error condition at the
* transport level).
*
*
After this method returns zero, the system will then call
* {@link #getNextFullRestorePackage()} to begin the restore process for the next
* application, and the sequence begins again.
*
*
The transport should always close this socket when returning from this method.
* Do not cache this socket across multiple calls or you may leak file descriptors.
*
* @param socket The file descriptor that the transport will use for delivering the
* streamed archive. The transport must close this socket in all cases when returning
* from this method.
* @return 0 when no more data for the current package is available. A positive value
* indicates the presence of that many bytes to be delivered to the app. Any negative
* return value is treated as equivalent to {@link BackupTransport#TRANSPORT_ERROR},
* indicating a fatal error condition that precludes further restore operations
* on the current dataset.
*/
int getNextFullRestoreDataChunk(in ParcelFileDescriptor socket);
/**
* If the OS encounters an error while processing {@link RestoreDescription#TYPE_FULL_STREAM}
* data for restore, it will invoke this method to tell the transport that it should
* abandon the data download for the current package. The OS will then either call
* {@link #nextRestorePackage()} again to move on to restoring the next package in the
* set being iterated over, or will call {@link #finishRestore()} to shut down the restore
* operation.
*
* @return {@link #TRANSPORT_OK} if the transport was successful in shutting down the
* current stream cleanly, or {@link #TRANSPORT_ERROR} to indicate a serious
* transport-level failure. If the transport reports an error here, the entire restore
* operation will immediately be finished with no further attempts to restore app data.
*/
int abortFullRestore();
}