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// Copyright Epic Games, Inc. All Rights Reserved.
#include <zenhttp/httpshared.h>
#include <zencore/compactbinarypackage.h>
#include <zencore/compositebuffer.h>
#include <zencore/iobuffer.h>
#include <zencore/iohash.h>
#include <zencore/stream.h>
#include <span>
#include <vector>
namespace zen {
CompositeBuffer
FormatPackageMessageBuffer(const CbPackage& Data)
{
std::vector<IoBuffer> Message = FormatPackageMessage(Data);
std::vector<SharedBuffer> Buffers;
for (IoBuffer& Buf : Message)
{
Buffers.push_back(SharedBuffer(Buf));
}
return CompositeBuffer(std::move(Buffers));
}
std::vector<IoBuffer>
FormatPackageMessage(const CbPackage& Data)
{
const std::span<const CbAttachment>& Attachments = Data.GetAttachments();
std::vector<IoBuffer> ResponseBuffers;
ResponseBuffers.reserve(3 + Attachments.size()); // TODO: may want to use an additional fudge factor here to avoid growing since each
// attachment is likely to consist of several buffers
uint64_t TotalAttachmentsSize = 0;
// Fixed size header
CbPackageHeader Hdr{.HeaderMagic = kCbPkgMagic, .AttachmentCount = gsl::narrow<uint32_t>(Attachments.size())};
ResponseBuffers.push_back(IoBufferBuilder::MakeCloneFromMemory(&Hdr, sizeof Hdr));
// Attachment metadata array
IoBuffer AttachmentMetadataBuffer = IoBuffer{sizeof(CbAttachmentEntry) * (Attachments.size() + /* root */ 1)};
CbAttachmentEntry* AttachmentInfo = reinterpret_cast<CbAttachmentEntry*>(AttachmentMetadataBuffer.MutableData());
ResponseBuffers.push_back(AttachmentMetadataBuffer); // Attachment metadata
// Root object
IoBuffer RootIoBuffer = Data.GetObject().GetBuffer().AsIoBuffer();
ResponseBuffers.push_back(RootIoBuffer); // Root object
*AttachmentInfo++ = {.AttachmentSize = RootIoBuffer.Size(),
.Flags = CbAttachmentEntry::kIsObject,
.AttachmentHash = Data.GetObjectHash()};
// Attachment payloads
for (const CbAttachment& Attachment : Attachments)
{
if (Attachment.IsNull())
{
ZEN_NOT_IMPLEMENTED("Null attachments are not supported");
}
else if (CompressedBuffer AttachmentBuffer = Attachment.AsCompressedBinary())
{
CompositeBuffer Compressed = AttachmentBuffer.GetCompressed();
*AttachmentInfo++ = {.AttachmentSize = AttachmentBuffer.GetCompressedSize(),
.Flags = CbAttachmentEntry::kIsCompressed,
.AttachmentHash = IoHash::FromBLAKE3(AttachmentBuffer.GetRawHash())};
for (const SharedBuffer& Segment : Compressed.GetSegments())
{
ResponseBuffers.push_back(Segment.AsIoBuffer());
TotalAttachmentsSize += Segment.GetSize();
}
}
else if (CbObject AttachmentObject = Attachment.AsObject())
{
IoBuffer ObjIoBuffer = AttachmentObject.GetBuffer().AsIoBuffer();
ResponseBuffers.push_back(ObjIoBuffer);
*AttachmentInfo++ = {.AttachmentSize = ObjIoBuffer.Size(),
.Flags = CbAttachmentEntry::kIsObject,
.AttachmentHash = Attachment.GetHash()};
}
else if (CompositeBuffer AttachmentBinary = Attachment.AsCompositeBinary())
{
*AttachmentInfo++ = {.AttachmentSize = AttachmentBinary.GetSize(), .Flags = 0, .AttachmentHash = Attachment.GetHash()};
for (const SharedBuffer& Segment : AttachmentBinary.GetSegments())
{
ResponseBuffers.push_back(Segment.AsIoBuffer());
TotalAttachmentsSize += Segment.GetSize();
}
}
else
{
ZEN_NOT_IMPLEMENTED("Unknown attachment kind");
}
}
return std::move(ResponseBuffers);
}
CbPackage
ParsePackageMessage(IoBuffer Payload, std::function<IoBuffer(const IoHash&, uint64_t)> CreateBuffer)
{
if (!Payload)
{
return {};
}
MemoryInStream InStream(Payload);
BinaryReader Reader(InStream);
CbPackageHeader Hdr;
Reader.Read(&Hdr, sizeof Hdr);
if (Hdr.HeaderMagic != kCbPkgMagic)
{
throw std::runtime_error("invalid CbPackage header magic");
}
const uint32_t ChunkCount = Hdr.AttachmentCount + 1;
std::unique_ptr<CbAttachmentEntry[]> AttachmentEntries{new CbAttachmentEntry[ChunkCount]};
Reader.Read(AttachmentEntries.get(), sizeof(CbAttachmentEntry) * ChunkCount);
CbPackage Package;
for (uint32_t i = 0; i < ChunkCount; ++i)
{
const CbAttachmentEntry& Entry = AttachmentEntries[i];
const uint64_t AttachmentSize = Entry.AttachmentSize;
IoBuffer AttachmentBuffer = CreateBuffer(Entry.AttachmentHash, AttachmentSize);
ZEN_ASSERT(AttachmentBuffer);
ZEN_ASSERT(AttachmentBuffer.Size() == AttachmentSize);
Reader.Read(AttachmentBuffer.MutableData(), AttachmentSize);
if (Entry.Flags & CbAttachmentEntry::kIsCompressed)
{
CompressedBuffer CompBuf(CompressedBuffer::FromCompressed(SharedBuffer(AttachmentBuffer)));
if (Entry.Flags & CbAttachmentEntry::kIsObject)
{
if (i == 0)
{
Package.SetObject(LoadCompactBinaryObject(std::move(CompBuf)));
}
else
{
ZEN_NOT_IMPLEMENTED("Object attachments are not currently supported");
}
}
else
{
CbAttachment Attachment(std::move(CompBuf));
Package.AddAttachment(Attachment);
}
}
else /* not compressed */
{
if (Entry.Flags & CbAttachmentEntry::kIsObject)
{
if (i == 0)
{
Package.SetObject(LoadCompactBinaryObject(AttachmentBuffer));
}
else
{
ZEN_NOT_IMPLEMENTED("Object attachments are not currently supported");
}
}
else
{
CbAttachment Attachment(SharedBuffer{AttachmentBuffer});
Package.AddAttachment(Attachment);
}
}
}
return Package;
}
} // namespace zen
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