/// <summary>
/// Retrieves the list of backups in the storage provider and populates the collection. Clears any existing
/// elements in the collection.
/// </summary>
public async Task GetExistingBackups()
{
using var scope = _scopeFactory.CreateScope();
var storage = scope.ServiceProvider.GetService <IStorageService>();
var existing = await storage.GetExistingFiles();
_list.Clear();
var startChar = _keyName.Length + 1;
foreach (var file in existing.Where(f => f.Item1.StartsWith(_keyName)))
{
try
{
var parseText = file.Item1.Substring(startChar).Split('.')[0];
var timeStamp = DateTime.ParseExact(parseText, _dateTimeFormat, CultureInfo.InvariantCulture);
var backup = new DbBackup(file.Item1, timeStamp, file.Item2);
_list[file.Item1] = backup;
}
catch (Exception)
{
// Exceptions here are ignored. Because we are reading directly from the storage backend we're
// going to have every parse error from every file show up as an exception.
}
}
}
public async Task RetrieveBackup(DbBackup backup, string destinationPath)
{
using var scope = _scopeFactory.CreateScope();
var storage = scope.ServiceProvider.GetService <IStorageService>();
try
{
await storage.DownloadFile(backup.FileName, destinationPath);
}
catch (Exception e)
{
_logger.Log(LogLevel.Error, e.Message);
throw;
}
}
/// <summary>
/// Add a backup file to the collection. This should be in the form of a dumped file with a unique but
/// irrelevant name that has already been compressed. The collection will manage the file's final name in the
/// storage backend.
/// </summary>
/// <param name="file">A FileInfo object pointing to the file to be added to the collection</param>
/// <param name="timeStamp">The timestamp from the database when the backup was taken</param>
/// <returns></returns>
public async Task AddBackup(FileInfo file, DateTime timeStamp)
{
var timeText = timeStamp.ToString(_dateTimeFormat);
var name = $"{_keyName}-{timeText}.sql.gz";
using var scope = _scopeFactory.CreateScope();
var storage = scope.ServiceProvider.GetService <IStorageService>();
try
{
await storage.UploadFile(file.FullName, name);
var newBackup = new DbBackup(name, timeStamp, (ulong)file.Length);
_list[name] = newBackup;
_addSubject.OnNext(newBackup);
}
catch (Exception e)
{
_logger.Log(LogLevel.Error, e.Message);
throw;
}
}