protected override async Task <SelectedSnapshot> LoadAsync(string persistenceId, SnapshotSelectionCriteria criteria)
{
IEnumerable <CloudBlockBlob> blobs = _extension
.BlobSnapshotStoreSettings
.GetBlobClient(persistenceId)
.GetContainerReference(_extension.BlobSnapshotStoreSettings.ContainerName)
.ListBlobs(persistenceId, true, BlobListingDetails.All).Cast <CloudBlockBlob>();
var results = blobs.OrderByDescending(t => SnapshotVersionHelper.Parse(t.Name));
if (results.Count() > 0)
{
_log.Debug("Found {0} snapshots for {1}", results.Count(), persistenceId);
foreach (CloudBlockBlob clob in results)
{
if (SnapshotVersionHelper.Parse(clob.Name) <= criteria.MaxSequenceNr &&
long.Parse(clob.Metadata["SnapshotTimestamp"]) <= criteria.MaxTimeStamp.Ticks)
{
using (var memoryStream = new MemoryStream())
{
clob.DownloadToStream(memoryStream);
var snapshot = JsonConvert.DeserializeObject(Encoding.UTF8.GetString(memoryStream.ToArray()),
typeof(SelectedSnapshot), _settings);
return((SelectedSnapshot)snapshot);
}
}
}
return(null);
}
else
{
return(null);
}
}
private IEnumerable <Task> TryDeleteAsync(string persistenceId, SnapshotSelectionCriteria criteria, IOrderedEnumerable <CloudBlockBlob> results)
{
foreach (CloudBlockBlob clob in results)
{
if (SnapshotVersionHelper.Parse(clob.Name) <= criteria.MaxSequenceNr &&
long.Parse(clob.Metadata["SnapshotTimestamp"]) <= criteria.MaxTimeStamp.Ticks)
{
_log.Debug("Found snapshot to remove for {0}", persistenceId);
yield return(clob.DeleteIfExistsAsync());
}
}
}
protected override async Task SaveAsync(SnapshotMetadata metadata, object snapshot)
{
try
{
CloudBlobClient blobClient = _extension.BlobSnapshotStoreSettings.GetBlobClient(metadata.PersistenceId);
CloudBlobContainer container = blobClient.GetContainerReference(_extension.BlobSnapshotStoreSettings.ContainerName);
CloudBlockBlob blockBlob = container.GetBlockBlobReference(metadata.PersistenceId + "." + SnapshotVersionHelper.ToVersionKey(metadata.SequenceNr) + ".json");
var snap = JsonConvert.SerializeObject(new SelectedSnapshot(metadata, snapshot), _settings);
using (var memoryStream = new MemoryStream(Encoding.UTF8.GetBytes(snap)))
{
memoryStream.Position = 0;
blockBlob.Metadata.Add("SnapshotTimestamp", metadata.Timestamp.Ticks.ToString());
blockBlob.Metadata.Add("Version", SnapshotVersionHelper.ToVersionKey(metadata.SequenceNr));
await blockBlob.UploadFromStreamAsync(memoryStream);
}
}
catch (Exception ex)
{
_log.Error(ex, ex.Message);
}
}
protected override async Task DeleteAsync(string persistenceId, SnapshotSelectionCriteria criteria)
{
try
{
IEnumerable <CloudBlockBlob> blobs = _extension
.BlobSnapshotStoreSettings
.GetBlobClient(persistenceId)
.GetContainerReference(_extension.BlobSnapshotStoreSettings.ContainerName)
.ListBlobs(persistenceId, true, BlobListingDetails.All).Cast <CloudBlockBlob>();
var results = blobs.OrderByDescending(t => SnapshotVersionHelper.Parse(t.Name));
if (results.Count() > 0)
{
var deleteTasks = TryDeleteAsync(persistenceId, criteria, results);
await Task.WhenAll(deleteTasks);
}
}
catch (Exception ex)
{
_log.Error(ex, ex.Message);
throw;
}
}
protected override async Task DeleteAsync(SnapshotMetadata metadata)
{
try
{
IEnumerable <CloudBlockBlob> blobs = _extension
.BlobSnapshotStoreSettings
.GetBlobClient(metadata.PersistenceId)
.GetContainerReference(_extension.BlobSnapshotStoreSettings.ContainerName)
.ListBlobs(metadata.PersistenceId + "." + SnapshotVersionHelper.ToVersionKey(metadata.SequenceNr) + ".json", true, BlobListingDetails.All).Cast <CloudBlockBlob>();
var deleteTasks = blobs.Select(clob =>
{
_log.Debug("Found snapshot to delete for {0}", metadata.PersistenceId);
return(clob.DeleteIfExistsAsync());
});
await Task.WhenAll(deleteTasks);
}
catch (Exception ex)
{
_log.Error(ex, ex.Message);
}
}
