private DownloadAndSaveObjectResult TryDownloadAndSaveObject(
string objectId,
CancellationToken cancellationToken,
RequestSource requestSource,
bool retryOnFailure)
{
if (objectId == GVFSConstants.AllZeroSha)
{
return(DownloadAndSaveObjectResult.Error);
}
DateTime negativeCacheRequestTime;
if (this.objectNegativeCache.TryGetValue(objectId, out negativeCacheRequestTime))
{
if (negativeCacheRequestTime > DateTime.Now.Subtract(NegativeCacheTTL))
{
return(DownloadAndSaveObjectResult.ObjectNotOnServer);
}
this.objectNegativeCache.TryRemove(objectId, out negativeCacheRequestTime);
}
// To reduce allocations, reuse the same buffer when writing objects in this batch
byte[] bufToCopyWith = new byte[StreamUtil.DefaultCopyBufferSize];
RetryWrapper <GitObjectsHttpRequestor.GitObjectTaskResult> .InvocationResult output = this.GitObjectRequestor.TryDownloadLooseObject(
objectId,
retryOnFailure,
cancellationToken,
requestSource.ToString(),
onSuccess: (tryCount, response) =>
{
// If the request is from git.exe (i.e. NamedPipeMessage) then we should assume that if there is an
// object on disk it's corrupt somehow (which is why git is asking for it)
this.WriteLooseObject(
response.Stream,
objectId,
overwriteExistingObject: requestSource == RequestSource.NamedPipeMessage,
bufToCopyWith: bufToCopyWith);
return(new RetryWrapper <GitObjectsHttpRequestor.GitObjectTaskResult> .CallbackResult(new GitObjectsHttpRequestor.GitObjectTaskResult(true)));
});
if (output.Result != null)
{
if (output.Succeeded && output.Result.Success)
{
return(DownloadAndSaveObjectResult.Success);
}
if (output.Result.HttpStatusCodeResult == HttpStatusCode.NotFound)
{
this.objectNegativeCache.AddOrUpdate(objectId, DateTime.Now, (unused1, unused2) => DateTime.Now);
return(DownloadAndSaveObjectResult.ObjectNotOnServer);
}
}
return(DownloadAndSaveObjectResult.Error);
}