zen build cache service (#318)

- **EXPERIMENTAL** `zen builds`
  - Feature: `--zen-cache-host` option for `upload` and `download` operations to use a zenserver host `/builds` endpoint for storing build blob and blob metadata
  - Feature: New `/builds` endpoint for caching build blobs and blob metadata
    - `/builds/{namespace}/{bucket}/{buildid}/blobs/{hash}` `GET` and `PUT` method for storing and fetching blobs
    - `/builds/{namespace}/{bucket}/{buildid}/blobs/putBlobMetadata` `POST` method for storing metadata about blobs
    - `/builds/{namespace}/{bucket}/{buildid}/blobs/getBlobMetadata` `POST` method for fetching metadata about blobs
    - `/builds/{namespace}/{bucket}/{buildid}/blobs/exists` `POST` method for checking existance of blobs

1 files changed, 18 insertions, 27 deletions

diff --git a/src/zenhttp/packageformat.cpp b/src/zenhttp/packageformat.cpp
index ae80851e4..9d423ecbc 100644
--- a/src/zenhttp/packageformat.cpp
+++ b/src/zenhttp/packageformat.cpp
@@ -279,11 +279,10 @@ FormatPackageMessageInternal(const CbPackage& Data, FormatFlags Flags, void* Tar
 		{
 			IoBuffer ObjIoBuffer = AttachmentObject.GetBuffer().AsIoBuffer();
 			ZEN_ASSERT(ObjIoBuffer.GetSize() > 0);
-			ResponseBuffers.emplace_back(std::move(ObjIoBuffer));
-
 			*AttachmentInfo++ = {.PayloadSize	 = ObjIoBuffer.Size(),
 								 .Flags			 = CbAttachmentEntry::kIsObject,
 								 .AttachmentHash = Attachment.GetHash()};
+			ResponseBuffers.emplace_back(std::move(ObjIoBuffer));
 		}
 		else if (const CompositeBuffer& AttachmentBinary = Attachment.AsCompositeBinary())
 		{
@@ -500,30 +499,25 @@ ParsePackageMessage(IoBuffer Payload, std::function<IoBuffer(const IoHash&, uint
 		{
 			if (Entry.Flags & CbAttachmentEntry::kIsObject)
 			{
+				CompressedBuffer CompBuf(CompressedBuffer::FromCompressedNoValidate(IoBuffer(AttachmentBuffer)));
+				if (!CompBuf)
+				{
+					// First payload is always a compact binary object
+					MalformedAttachments.push_back(
+						std::make_pair(i,
+									   fmt::format("Invalid format, expected compressed buffer for CbObject (size {}) for {}",
+												   AttachmentBuffer.GetSize(),
+												   Entry.AttachmentHash)));
+				}
+				CbObject AttachmentObject = LoadCompactBinaryObject(std::move(CompBuf));
 				if (i == 0)
 				{
-					CompressedBuffer CompBuf(CompressedBuffer::FromCompressedNoValidate(IoBuffer(AttachmentBuffer)));
-					if (CompBuf)
-					{
-						Package.SetObject(LoadCompactBinaryObject(std::move(CompBuf)));
-					}
-					else
-					{
-						// First payload is always a compact binary object
-						MalformedAttachments.push_back(
-							std::make_pair(i,
-										   fmt::format("Invalid format, expected compressed buffer for CbObject (size {}) for {}",
-													   AttachmentBuffer.GetSize(),
-													   Entry.AttachmentHash)));
-					}
+					// First payload is always a compact binary object
+					Package.SetObject(AttachmentObject);
 				}
 				else
 				{
-					MalformedAttachments.push_back(std::make_pair(
-						i,
-						fmt::format("Invalid format, compressed object attachments are not currently supported (size {}) for {}",
-									AttachmentBuffer.GetSize(),
-									Entry.AttachmentHash)));
+					Attachments.emplace_back(CbAttachment(AttachmentObject, Entry.AttachmentHash));
 				}
 			}
 			else
@@ -547,17 +541,14 @@ ParsePackageMessage(IoBuffer Payload, std::function<IoBuffer(const IoHash&, uint
 		{
 			if (Entry.Flags & CbAttachmentEntry::kIsObject)
 			{
+				CbObject AttachmentObject = LoadCompactBinaryObject(AttachmentBuffer);
 				if (i == 0)
 				{
-					Package.SetObject(LoadCompactBinaryObject(AttachmentBuffer));
+					Package.SetObject(AttachmentObject);
 				}
 				else
 				{
-					MalformedAttachments.push_back(
-						std::make_pair(i,
-									   fmt::format("Invalid format, object attachments are not currently supported (size {}) for {}",
-												   AttachmentBuffer.GetSize(),
-												   Entry.AttachmentHash)));
+					Attachments.emplace_back(CbAttachment(AttachmentObject, Entry.AttachmentHash));
 				}
 			}
 			else if (AttachmentSize > 0)