/// <summary>
/// Uses a <see cref="PrefetchPacksDeserializer"/> to read the packs from the stream.
/// </summary>
private RetryWrapper <HttpGitObjects.GitObjectTaskResult> .CallbackResult DeserializePrefetchPacks(
HttpGitObjects.GitEndPointResponseData response, ref long latestTimestamp)
{
using (ITracer activity = this.Tracer.StartActivity(nameof(this.DeserializePrefetchPacks), EventLevel.Informational))
{
PrefetchPacksDeserializer deserializer = new PrefetchPacksDeserializer(response.Stream);
foreach (PrefetchPacksDeserializer.PackAndIndex pack in deserializer.EnumeratePacks())
{
string packName = string.Format("{0}-{1}-{2}.pack", GVFSConstants.PrefetchPackPrefix, pack.Timestamp, pack.UniqueId);
string packFullPath = Path.Combine(this.Enlistment.GitPackRoot, packName);
string idxName = string.Format("{0}-{1}-{2}.idx", GVFSConstants.PrefetchPackPrefix, pack.Timestamp, pack.UniqueId);
string idxFullPath = Path.Combine(this.Enlistment.GitPackRoot, idxName);
EventMetadata data = new EventMetadata();
data["timestamp"] = pack.Timestamp.ToString();
data["uniqueId"] = pack.UniqueId;
activity.RelatedEvent(EventLevel.Informational, "Receiving Pack/Index", data);
// Write the pack
// If it fails, TryWriteNamedPackOrIdx cleans up the packfile and we retry the prefetch
if (!this.TryWriteNamedPackOrIdx(activity, pack.PackStream, packFullPath))
{
return(new RetryWrapper <HttpGitObjects.GitObjectTaskResult> .CallbackResult(null, true));
}
// We will try to build an index if the server does not send one
if (pack.IndexStream == null)
{
if (!this.TryBuildIndex(activity, pack, packFullPath))
{
return(new RetryWrapper <HttpGitObjects.GitObjectTaskResult> .CallbackResult(null, true));
}
}
else if (!this.TryWriteNamedPackOrIdx(activity, pack.IndexStream, idxFullPath))
{
// Try to build the index manually, then retry the prefetch
if (this.TryBuildIndex(activity, pack, packFullPath))
{
// If we were able to recreate the failed index
// we can start the prefetch at the next timestamp
latestTimestamp = pack.Timestamp;
}
// The download stream will not be in a good state if the index download fails.
// So we have to restart the prefetch
return(new RetryWrapper <HttpGitObjects.GitObjectTaskResult> .CallbackResult(null, true));
}
latestTimestamp = pack.Timestamp;
}
return(new RetryWrapper <HttpGitObjects.GitObjectTaskResult> .CallbackResult(
new HttpGitObjects.GitObjectTaskResult(true)));
}
}
public virtual string WriteTempPackFile(HttpGitObjects.GitEndPointResponseData response)
{
string fileName = Path.GetRandomFileName();
string fullPath = Path.Combine(this.Enlistment.GitPackRoot, fileName);
this.TryWriteNamedPackOrIdx(
tracer: null,
source: response.Stream,
targetFullPath: fullPath,
throwOnError: true);
return(fullPath);
}
private RetryWrapper <HttpGitObjects.GitObjectTaskResult> .CallbackResult TrySavePackOrLooseObject(IEnumerable <string> objectShas, bool unpackObjects, HttpGitObjects.GitEndPointResponseData responseData)
{
if (responseData.ContentType == HttpGitObjects.ContentType.LooseObject)
{
List <string> objectShaList = objectShas.Distinct().ToList();
if (objectShaList.Count != 1)
{
return(new RetryWrapper <HttpGitObjects.GitObjectTaskResult> .CallbackResult(new InvalidOperationException("Received loose object when multiple objects were requested."), shouldRetry : false));
}
this.WriteLooseObject(this.Enlistment.WorkingDirectoryRoot, responseData.Stream, objectShaList[0]);
}
else if (responseData.ContentType == HttpGitObjects.ContentType.BatchedLooseObjects)
{
BatchedLooseObjectDeserializer deserializer = new BatchedLooseObjectDeserializer(
responseData.Stream,
(stream, sha) => this.WriteLooseObject(this.Enlistment.WorkingDirectoryRoot, stream, sha));
deserializer.ProcessObjects();
}
else
{
GitProcess.Result result = this.TryAddPackFile(responseData.Stream, unpackObjects);
if (result.HasErrors)
{
return(new RetryWrapper <HttpGitObjects.GitObjectTaskResult> .CallbackResult(new InvalidOperationException("Could not add pack file: " + result.Errors), shouldRetry : false));
}
}
return(new RetryWrapper <HttpGitObjects.GitObjectTaskResult> .CallbackResult(new HttpGitObjects.GitObjectTaskResult(true)));
}