public virtual async Task <StorageDeleteOperationResult> DeleteBackup(string identifier, StorageBackup backup)
{
if (backup == null)
{
throw new ArgumentNullException(nameof(backup));
}
if (!await Exists(backup.Identifier))
{
return(new StorageDeleteOperationResult(false));
}
StorageMetaData metaData = await LoadMetaData(identifier);
if (metaData.Has("Backups"))
{
List <StorageBackup> backups = metaData.Get <List <StorageBackup> >("Backups");
StorageBackup backupToRemove = backup;
foreach (StorageBackup currentBackup in backups)
{
if (currentBackup.Identifier == backup.Identifier)
{
backupToRemove = currentBackup;
}
}
backups.Remove(backupToRemove);
metaData["Backups"] = backups;
await SaveMetaData(identifier, metaData);
}
return(await Delete(backup.Identifier));
}
public virtual async Task <StorageBackup> GetLatestBackup(string identifier)
{
StorageMetaData metaData = await LoadMetaData(identifier);
if (metaData.Has("Backups"))
{
List <StorageBackup> backups = metaData.Get <List <StorageBackup> >("Backups");
StorageBackup latestBackup = null;
foreach (StorageBackup backup in backups)
{
if (latestBackup == null)
{
latestBackup = backup;
}
else if (backup.BackupTimeUtc > latestBackup.BackupTimeUtc)
{
if (await Exists(backup.Identifier))
{
latestBackup = backup;
}
}
}
return(latestBackup);
}
return(null);
}
public virtual async Task UpdateMetaData(string identifier, bool isWrite, bool encrypted)
{
if (!this.UseMetaData)
{
return;
}
StorageMetaData metaData = await LoadMetaData(identifier);
if (isWrite)
{
DateTime creationTime = metaData.Get <DateTime>("CreationTimeUtc");
if (creationTime == default(DateTime))
{
metaData["CreationTimeUtc"] = DateTime.UtcNow;
}
metaData["LastModificationTimeUtc"] = DateTime.UtcNow;
metaData["Encrypted"] = encrypted;
}
else
{
metaData["LastAccessTimeUtc"] = DateTime.UtcNow;
}
metaData["ApplicationVersion"] = Application.version;
await SaveMetaData(identifier, metaData);
}
public virtual async Task <List <StorageBackup> > GetBackups(string identifier)
{
StorageMetaData metaData = await LoadMetaData(identifier);
if (metaData.Has("Backups"))
{
return(metaData.Get <List <StorageBackup> >("Backups"));
}
return(null);
}
public virtual async Task <bool> DeleteBackups(string identifier)
{
StorageMetaData metaData = await LoadMetaData(identifier);
if (metaData.Has("Backups"))
{
bool allSucceed = true;
List <StorageBackup> backups = metaData.Get <List <StorageBackup> >("Backups");
foreach (StorageBackup backup in backups)
{
if (await Exists(backup.Identifier))
{
allSucceed &= (await Delete(backup.Identifier)).Succeed;
}
}
backups.Clear();
metaData["Backups"] = backups;
await SaveMetaData(identifier, metaData);
return(allSucceed);
}
return(false);
}
public virtual async Task <StorageBackup> CreateBackup(string identifier)
{
DateTime backupTimeUtc = DateTime.UtcNow;
string backupIdentifier = identifier + backupTimeUtc.Ticks + this.BackupSuffix;
StorageBackup backup = new StorageBackup(backupIdentifier, backupTimeUtc);
await Copy(identifier, backupIdentifier, false);
// Update source item meta data after creating backup
StorageMetaData metaData = await LoadMetaData(identifier);
List <StorageBackup> backups = new List <StorageBackup>();
if (metaData.Has("Backups"))
{
backups = metaData.Get <List <StorageBackup> >("Backups");
}
backups.Add(backup);
metaData["Backups"] = backups;
await SaveMetaData(identifier, metaData);
return(backup);
}