public virtual async Task <StorageResponseHolder> Update(string key, byte[] body,
string contentType = null, string contentEncoding = null,
string version = null, string oldVersion = null,
string directory = null, IEnumerable <KeyValuePair <string, string> > metadata = null,
CancellationToken?cancel = null, bool createSnapshot = false, bool useEncryption = true)
{
var request = new StorageRequestHolder(key, cancel, directory);
return(await CallCloudBlockBlob(request,
async (rq, rs, exists) =>
{
if (!exists)
{
rq.CopyTo(rs);
rs.StatusCode = 404;
rs.IsSuccess = false;
return;
}
if (oldVersion != null && oldVersion != rq.VersionId)
{
MetadataGet(rq.Blob, rs);
rs.StatusCode = 409;
rs.IsSuccess = false;
return;
}
if (createSnapshot)
{
await rq.Blob.CreateSnapshotAsync(rq.Fields,
AccessCondition.GenerateIfMatchCondition(rq.ETag), mOptions, mContext, rq.CancelSet);
MetadataGet(rq.Blob, rq);
}
rq.ContentType = contentType ?? rs.ContentType;
rq.ContentEncoding = contentEncoding ?? rs.ContentEncoding;
rq.VersionId = version;
MetadataSet(rq.Blob, rq);
// If encryption provided encrypt the body
var uploadBody = body;
if (useEncryption && mEncryption != null)
{
uploadBody = mEncryption.Encrypt(body);
}
await rq.Blob.UploadFromByteArrayAsync(uploadBody, 0, uploadBody.Length,
AccessCondition.GenerateIfMatchCondition(rq.ETag), mOptions, mContext, rq.CancelSet);
MetadataGet(rq.Blob, rs);
rs.Data = body;
rs.IsSuccess = true;
rs.StatusCode = 200;
}));
}
/// <summary>
/// This is wrapper class that provides generic exception handling support
/// and retrieves the standard metadata for each request.
/// </summary>
/// <param name="rq">The request.</param>
/// <param name="rs">The response.</param>
/// <param name="action">The async action task.</param>
/// <returns>Returns a task with the response.</returns>
protected async Task <StorageResponseHolder> CallCloudBlockBlob(StorageRequestHolder rq
, Func <StorageRequestHolder, StorageResponseHolder, bool, Task> action)
{
int start = StatisticsInternal.ActiveIncrement();
var rs = new StorageResponseHolder();
try
{
var refEntityDirectory = mEntityContainer.GetDirectoryReference(rq.Directory);
rq.Blob = refEntityDirectory.GetBlockBlobReference(rq.SafeKey);
bool exists = await rq.Blob.ExistsAsync(rq.CancelSet);
if (exists)
{
MetadataGet(rq.Blob, rq);
exists ^= rq.IsDeleted;
}
await action(rq, rs, exists);
}
catch (StorageException sex)
{
rs.Ex = sex;
rs.IsSuccess = false;
rs.StatusCode = sex.RequestInformation.HttpStatusCode;
rs.IsTimeout = rs.StatusCode == 500 || rs.StatusCode == 503;
}
catch (TaskCanceledException tcex)
{
rs.Ex = tcex;
rs.IsTimeout = true;
rs.IsSuccess = false;
rs.StatusCode = 502;
}
catch (Exception ex)
{
rs.Ex = ex;
rs.IsSuccess = false;
rs.StatusCode = 500;
}
finally
{
if (!rs.IsSuccess)
{
StatisticsInternal.ErrorIncrement();
}
StatisticsInternal.ActiveDecrement(start);
}
return(rs);
}
public virtual async Task <StorageResponseHolder> Create(string key
, byte[] body
, string contentType = null
, string contentEncoding = null
, string version = null
, string directory = null
, IEnumerable <KeyValuePair <string, string> > metadata = null
, CancellationToken?cancel = null
, bool useEncryption = true)
{
var request = new StorageRequestHolder(key, cancel, directory);
return(await CallCloudBlockBlob(request,
async (rq, rs, exists) =>
{
if (!exists)
{
//Check for a soft delete condition.
var access = rq.ETag != null ? AccessCondition.GenerateIfMatchCondition(rq.ETag) : AccessCondition.GenerateIfNotExistsCondition();
rq.ContentType = contentType;
rq.ContentEncoding = contentEncoding;
rq.VersionId = version;
if (metadata != null)
{
rq.Fields = metadata.ToDictionary((k) => k.Key, (k) => k.Value);
}
MetadataSet(rq.Blob, rq);
// If encryption provided encrypt the body
var uploadBody = body;
if (useEncryption && mEncryption != null)
{
uploadBody = mEncryption.Encrypt(body);
}
await rq.Blob.UploadFromByteArrayAsync(uploadBody, 0, uploadBody.Length,
access, mOptions, mContext, rq.CancelSet);
MetadataGet(rq.Blob, rs);
rs.Data = body;
}
else
{
rq.CopyTo(rs);
}
rs.IsSuccess = !exists;
rs.StatusCode = exists ? 409 : 201;
}));
}
public virtual async Task <StorageResponseHolder> Delete(string key, string directory = null, string version = null
, CancellationToken?cancel = null
, bool createSnapshotBeforeDelete = true, bool hardDelete = false)
{
var request = new StorageRequestHolder(key, cancel, directory);
return(await CallCloudBlockBlob(request,
async (rq, rs, exists) =>
{
//Does the entity currently exist?
if (!exists)
{
rq.CopyTo(rs);
rs.IsSuccess = false;
rs.StatusCode = 404;
return;
}
//OK, do the version match?
if (version != null && rq.VersionId != version)
{
MetadataGet(rq.Blob, rs);
rs.IsSuccess = false;
rs.StatusCode = 409;
return;
}
if (hardDelete)
{
//OK, we hard delete the entity and remove any snapshots that may be there.
await rq.Blob.DeleteAsync(DeleteSnapshotsOption.IncludeSnapshots, AccessCondition.GenerateIfMatchCondition(rq.ETag), mOptions, mContext, rq.CancelSet);
}
else
{
if (createSnapshotBeforeDelete)
{
await rq.Blob.CreateSnapshotAsync(rq.Fields,
AccessCondition.GenerateIfMatchCondition(rq.ETag), mOptions, mContext, rq.CancelSet);
}
//Ok, we are going to soft delete the entity.
MetadataSet(rq.Blob, rq, deleted: true);
await rq.Blob.SetMetadataAsync(AccessCondition.GenerateIfMatchCondition(rq.ETag), mOptions, mContext, rq.CancelSet);
}
MetadataGet(rq.Blob, rs);
rs.IsSuccess = true;
rs.StatusCode = 200;
}));
}
public virtual async Task <StorageResponseHolder> Version(string key, string directory = null, CancellationToken?cancel = null)
{
var request = new StorageRequestHolder(key, cancel, directory);
return(await CallCloudBlockBlob(request,
async (rq, rs, exists) =>
{
if (exists)
{
MetadataGet(rq.Blob, rs);
}
else
{
rq.CopyTo(rs);
}
rs.IsSuccess = exists;
rs.StatusCode = exists ? 200 : 404;
}));
}
public virtual async Task <StorageResponseHolder> Read(string key
, string directory = null
, CancellationToken?cancel = null
, bool useEncryption = true)
{
var request = new StorageRequestHolder(key, cancel, directory);
return(await CallCloudBlockBlob(request,
async (rq, rs, exists) =>
{
if (exists)
{
var sData = new MemoryStream();
await rq.Blob.DownloadToStreamAsync(sData, rq.CancelSet);
rs.Data = new byte[sData.Length];
sData.Position = 0;
sData.Read(rs.Data, 0, rs.Data.Length);
// If encryption provided decrypt the blob
if (useEncryption && mEncryption != null)
{
rs.Data = mEncryption.Decrypt(rs.Data);
}
MetadataGet(rq.Blob, rs);
}
else
{
rq.CopyTo(rs);
}
rs.IsSuccess = exists;
rs.StatusCode = exists ? 200 : 404;
}));
}
