Clean up project store file structure (#218)

* move project store to separate folder
* moved import/export project commands into projectstore cmd files

1 files changed, 619 insertions, 0 deletions

diff --git a/zen/cmds/projectstore.cpp b/zen/cmds/projectstore.cpp
index d83bff53c..03e1130cb 100644
--- a/zen/cmds/projectstore.cpp
+++ b/zen/cmds/projectstore.cpp
@@ -2,17 +2,135 @@
 
 #include "projectstore.h"
 
+#include <zencore/compactbinary.h>
+#include <zencore/compactbinarybuilder.h>
+#include <zencore/compactbinarypackage.h>
+#include <zencore/compactbinaryvalue.h>
+#include <zencore/compress.h>
 #include <zencore/filesystem.h>
+#include <zencore/fmtutils.h>
+#include <zencore/iohash.h>
 #include <zencore/logging.h>
+#include <zencore/stream.h>
+#include <zencore/uid.h>
+#include <zencore/workthreadpool.h>
 #include <zenhttp/httpcommon.h>
+#include <zenhttp/httpshared.h>
+#include <zenutil/basicfile.h>
 #include <zenutil/zenserverprocess.h>
 
 #include <memory>
 
 ZEN_THIRD_PARTY_INCLUDES_START
 #include <cpr/cpr.h>
+#include <gsl/gsl-lite.hpp>
 ZEN_THIRD_PARTY_INCLUDES_END
 
+namespace {
+struct OplogHeader
+{
+	enum uint32
+	{
+		kMagic = 0x7816'B013
+	};
+	uint32_t	Magic	   = kMagic;
+	uint32_t	HeaderSize = sizeof(OplogHeader);
+	uint64_t	OpCount	   = 0;
+	zen::IoHash Checksum   = zen::IoHash::Zero;
+};
+struct OplogEntry
+{
+	uint64_t Offset;
+	uint32_t OpLength;
+};
+
+struct ChunksHeader
+{
+	enum uint32
+	{
+		kMagic = 0x574C'B016
+	};
+	uint32_t Magic			= kMagic;
+	uint64_t ChunkCount		= 0;
+	uint8_t	 BlockSizeShift = 31u;
+	uint8_t	 Reserved1		= 0;
+	uint16_t Reserved2		= 0;
+	uint32_t Reserved3		= 0;
+};
+struct ChunkEntry
+{
+	zen::IoHash ChunkHash;
+	uint64_t	Offset;
+	uint64_t	Length;
+};
+
+std::filesystem::path
+GetOplogPath(const std::filesystem::path RootPath, const std::string& Oplog)
+{
+	return RootPath / (Oplog + ".ops");
+}
+
+std::filesystem::path
+GetLargeChunkPath(const std::filesystem::path RootPath, const zen::IoHash& OpHash)
+{
+	zen::ExtendablePathBuilder<128> ShardedPath;
+	ShardedPath.Append(RootPath.c_str());
+	zen::ExtendableStringBuilder<64> HashString;
+	OpHash.ToHexString(HashString);
+	const char* str = HashString.c_str();
+	ShardedPath.AppendSeparator();
+	ShardedPath.AppendAsciiRange(str, str + 3);
+
+	ShardedPath.AppendSeparator();
+	ShardedPath.AppendAsciiRange(str + 3, str + 5);
+
+	ShardedPath.AppendSeparator();
+	ShardedPath.AppendAsciiRange(str + 5, str + 40);
+
+	return ShardedPath.ToPath();
+}
+
+std::filesystem::path
+GetProjectPath(const std::filesystem::path RootPath, const std::string_view ProjectName)
+{
+	return RootPath / (std::string(ProjectName) + ".zcb");
+}
+
+std::filesystem::path
+GetChunksIndexPath(const std::filesystem::path RootPath)
+{
+	return RootPath / "chunks.idx";
+}
+
+std::filesystem::path
+GetChunksPath(const std::filesystem::path RootPath, uint32_t BlockIndex)
+{
+	return RootPath / fmt::format("chunks{}.bin", BlockIndex);
+}
+
+bool
+IsSuccess(const cpr::Response& Response, const std::string_view Operation)
+{
+	if (!zen::IsHttpSuccessCode(Response.status_code))
+	{
+		if (Response.status_code)
+		{
+			ZEN_ERROR("{} failed: {}: {} ({})", Operation, Response.status_code, Response.reason, Response.text);
+		}
+		else
+		{
+			ZEN_ERROR("{} failed: {}", Operation, Response.error.message);
+		}
+
+		return false;
+	}
+	return true;
+}
+
+}  // namespace
+
+///////////////////////////////////////
+
 DropProjectCommand::DropProjectCommand()
 {
 	m_Options.add_options()("h,help", "Print help");
@@ -71,6 +189,8 @@ DropProjectCommand::Run(const ZenCliOptions& GlobalOptions, int argc, char** arg
 	return 1;
 }
 
+///////////////////////////////////////
+
 ProjectInfoCommand::ProjectInfoCommand()
 {
 	m_Options.add_options()("h,help", "Print help");
@@ -130,3 +250,502 @@ ProjectInfoCommand::Run(const ZenCliOptions& GlobalOptions, int argc, char** arg
 
 	return 1;
 }
+
+///////////////////////////////////////
+
+ExportProjectCommand::ExportProjectCommand()
+{
+	m_Options.add_options()("h,help", "Print help");
+	m_Options.add_option("", "u", "hosturl", "Host URL", cxxopts::value(m_HostName)->default_value("http://localhost:1337"), "<hosturl>");
+	m_Options.add_option("", "t", "target", "Target path", cxxopts::value(m_TargetPath), "<targetpath>");
+	m_Options.add_option("", "p", "project", "Project name", cxxopts::value(m_ProjectName), "<projectname>");
+	m_Options.add_option("", "o", "oplog", "Oplog name", cxxopts::value(m_OplogNames), "<oplog>");
+	m_Options.parse_positional({"target", "project", "oplog"});
+}
+
+ExportProjectCommand::~ExportProjectCommand() = default;
+
+int
+ExportProjectCommand::Run(const ZenCliOptions& GlobalOptions, int argc, char** argv)
+{
+	using namespace std::literals;
+
+	ZEN_UNUSED(GlobalOptions);
+
+	if (!ParseOptions(argc, argv))
+	{
+		return 0;
+	}
+
+	if (m_ProjectName.empty())
+	{
+		ZEN_ERROR("Project name must be given");
+		return 1;
+	}
+
+	if (m_TargetPath.empty())
+	{
+		ZEN_ERROR("Target path must be given");
+		return 1;
+	}
+
+	if (!std::filesystem::exists(m_TargetPath))
+	{
+		zen::CreateDirectories(m_TargetPath);
+	}
+	else if (!std::filesystem::is_directory(m_TargetPath))
+	{
+		ZEN_ERROR("Target path '{}' is not a directory", m_TargetPath);
+		return 1;
+	}
+
+	const std::string UrlBase = fmt::format("{}/prj", m_HostName);
+
+	cpr::Session Session;
+	{
+		ZEN_CONSOLE("Requesting project '{}' from '{}'", m_ProjectName, m_HostName);
+
+		std::string ProjectRequest = fmt::format("{}/{}", UrlBase, m_ProjectName);
+		Session.SetUrl({ProjectRequest});
+		cpr::Response Response = Session.Get();
+		if (!IsSuccess(Response, ProjectRequest))
+		{
+			return 1;
+		}
+		zen::IoBuffer  Payload(zen::IoBuffer::Wrap, Response.text.data(), Response.text.size());
+		zen::BasicFile ProjectStore;
+		ProjectStore.Open(GetProjectPath(m_TargetPath, m_ProjectName), zen::BasicFile::Mode::kTruncate);
+		ProjectStore.Write(Payload.GetView(), 0);
+
+		if (m_OplogNames.empty())
+		{
+			zen::CbObject	  Params = LoadCompactBinaryObject(Payload);
+			zen ::CbArrayView Oplogs = Params["oplogs"sv].AsArrayView();
+			for (auto& OplogEntry : Oplogs)
+			{
+				std::string_view OpLog = OplogEntry.AsObjectView()["id"sv].AsString();
+				m_OplogNames.push_back(std::string(OpLog));
+			}
+		}
+	}
+
+	std::unordered_set<zen::IoHash, zen::IoHash::Hasher> UniqueChunks;
+	std::vector<zen::CbAttachment>						 AllAttachments;
+	std::vector<zen::CbPackage>							 OplogResponses;
+	for (const std::string& OplogName : m_OplogNames)
+	{
+		ZEN_CONSOLE("Requesting oplog '{}/{}' from '{}' to '{}'", m_ProjectName, OplogName, m_HostName, m_TargetPath);
+
+		std::string GetOplogArchiveRequest = fmt::format("{}/{}/oplog/{}/archive", UrlBase, m_ProjectName, OplogName);
+		Session.SetUrl({GetOplogArchiveRequest});
+		Session.SetHeader(cpr::Header{{"Accept", "application/x-ue-comp"}});
+		cpr::Response Response = Session.Get();
+		if (!IsSuccess(Response, GetOplogArchiveRequest))
+		{
+			return 1;
+		}
+		zen::IoBuffer CompressedPayload(zen::IoBuffer::Wrap, Response.text.data(), Response.text.size());
+		zen::IoBuffer Payload = zen::CompressedBuffer::FromCompressedNoValidate(std::move(CompressedPayload)).Decompress().AsIoBuffer();
+
+		OplogResponses.emplace_back(zen::ParsePackageMessage(Payload));
+		zen::CbPackage& ResponsePackage = OplogResponses.back();
+		zen::CbObject	Result			= ResponsePackage.GetObject();
+
+		zen::IoHash		  Checksum = Result["checksum"sv].AsHash();
+		zen ::CbArrayView Entries  = Result["entries"sv].AsArrayView();
+
+		ZEN_CONSOLE("Exporting {} ops for oplog '{}/{}' with checksum '{}' to '{}'",
+					Entries.Num(),
+					m_ProjectName,
+					OplogName,
+					Checksum,
+					m_TargetPath);
+		{
+			zen::BasicFile OpStore;
+			OpStore.Open(GetOplogPath(m_TargetPath, OplogName), zen::BasicFile::Mode::kTruncate);
+			OplogHeader Header = {.OpCount = Entries.Num(), .Checksum = Checksum};
+			OpStore.Write(&Header, sizeof(OplogHeader), 0);
+			std::vector<OplogEntry> OpEntries;
+			OpEntries.resize(Entries.Num());
+			const uint64_t DataOffset = sizeof(OplogHeader) + OpEntries.size() * sizeof(OplogEntry);
+			uint64_t	   BulkOffset = DataOffset;
+
+			zen::IoHashStream Hasher;
+
+			for (uint64_t OpIndex = 0; auto& OpEntry : Entries)
+			{
+				zen::BinaryWriter Writer;
+				OpEntry.CopyTo(Writer);
+				zen::MemoryView OpView = Writer.GetView();
+				Hasher.Append(OpView);
+
+				OpEntries[OpIndex].Offset	= BulkOffset;
+				OpEntries[OpIndex].OpLength = gsl::narrow<uint32_t>(OpView.GetSize());
+				OpStore.Write(OpView, BulkOffset);
+				BulkOffset += OpView.GetSize();
+				OpIndex++;
+			}
+			zen::IoHash CalculatedChecksum = Hasher.GetHash();
+			if (CalculatedChecksum != Checksum)
+			{
+				ZEN_ERROR("Checksum for oplog does not match. Expected '{}' but got '{}'", Checksum, CalculatedChecksum);
+				return 1;
+			}
+			OpStore.Write(OpEntries.data(), OpEntries.size() * sizeof(OplogEntry), sizeof(OplogHeader));
+		}
+
+		std::span<const zen::CbAttachment> Attachments = ResponsePackage.GetAttachments();
+		AllAttachments.reserve(AllAttachments.size() + Attachments.size());
+		AllAttachments.reserve(UniqueChunks.size() + Attachments.size());
+		for (const zen::CbAttachment& Attachment : Attachments)
+		{
+			if (UniqueChunks.insert(Attachment.GetHash()).second)
+			{
+				AllAttachments.push_back(Attachment);
+			}
+		}
+
+		ZEN_CONSOLE("Exported {} ops referencing {} chunks for {}", Entries.Num(), Attachments.size(), OplogName);
+	}
+
+	size_t		   ChunkCount = AllAttachments.size();
+	zen::BasicFile ChunkStoreIndex;
+	ChunkStoreIndex.Open(GetChunksIndexPath(m_TargetPath), zen::BasicFile::Mode::kTruncate);
+	ChunksHeader Header = {.ChunkCount = ChunkCount};
+	ChunkStoreIndex.Write(&Header, sizeof(ChunksHeader), 0);
+	std::vector<ChunkEntry> ChunkEntries;
+	ChunkEntries.resize(ChunkCount);
+	uint64_t ChunkOffset = 0;
+
+	zen::WorkerThreadPool WorkerPool(std::thread::hardware_concurrency());
+	std::atomic_int64_t	  JobCount = 0;
+	std::vector<size_t>	  BlockChunkIndexes;
+	const size_t		  BlockSize			= 1ull << Header.BlockSizeShift;
+	uint32_t			  CurrentBlockIndex = 0;
+
+	auto WriteBlockAsync = [](const std::string&					TargetPath,
+							  size_t								WriteBlockOffset,
+							  uint32_t								BlockIndex,
+							  const std::vector<size_t>&			BlockChunkIndexes,
+							  const std::vector<ChunkEntry>&		ChunkEntries,
+							  const std::vector<zen::CbAttachment>& Attachments,
+							  zen::WorkerThreadPool&				WorkerPool,
+							  std::atomic_int64_t&					JobCount) {
+		JobCount.fetch_add(1);
+		WorkerPool.ScheduleWork([&TargetPath, WriteBlockOffset, BlockIndex, BlockChunkIndexes, &ChunkEntries, &Attachments, &JobCount]() {
+			zen::BasicFile ChunkBlock;
+			ChunkBlock.Open(GetChunksPath(TargetPath, BlockIndex), zen::BasicFile::Mode::kTruncate);
+			for (size_t ChunkIndex : BlockChunkIndexes)
+			{
+				const ChunkEntry&	 Chunk				  = ChunkEntries[ChunkIndex];
+				zen::CompositeBuffer AttachmentBody		  = Attachments[ChunkIndex].AsCompressedBinary().GetCompressed();
+				size_t				 AttachmentBulkOffset = Chunk.Offset - WriteBlockOffset;
+				for (const zen::SharedBuffer& Segment : AttachmentBody.GetSegments())
+				{
+					size_t SegmentSize = Segment.GetSize();
+					ChunkBlock.Write(Segment.GetData(), Segment.GetSize(), AttachmentBulkOffset);
+					AttachmentBulkOffset += SegmentSize;
+				}
+			}
+			JobCount.fetch_add(-1);
+		});
+	};
+
+	ZEN_CONSOLE("Exporting {} chunks from '{}' to '{}'", AllAttachments.size(), m_HostName, m_TargetPath);
+	for (size_t ChunkIndex = 0; const zen::CbAttachment& Attachment : AllAttachments)
+	{
+		ChunkEntry& Chunk					= ChunkEntries[ChunkIndex];
+		Chunk.ChunkHash						= Attachment.GetHash();
+		zen::CompositeBuffer AttachmentBody = Attachment.AsCompressedBinary().GetCompressed();
+		Chunk.Length						= AttachmentBody.GetSize();
+
+		if (Chunk.Length < 1 * 1024 * 1024)	 // Use reasonable length for file
+		{
+			uint32_t BlockIndex = gsl::narrow<uint32_t>((ChunkOffset + Chunk.Length) / BlockSize);
+			if (BlockIndex != CurrentBlockIndex)
+			{
+				size_t WriteBlockOffset = CurrentBlockIndex * BlockSize;
+				WriteBlockAsync(m_TargetPath,
+								WriteBlockOffset,
+								CurrentBlockIndex,
+								BlockChunkIndexes,
+								ChunkEntries,
+								AllAttachments,
+								WorkerPool,
+								JobCount);
+
+				ChunkOffset		  = BlockIndex * BlockSize;
+				CurrentBlockIndex = BlockIndex;
+				BlockChunkIndexes.clear();
+			}
+
+			Chunk.Offset = ChunkOffset;
+			ChunkOffset	 = Chunk.Offset + Chunk.Length;
+			BlockChunkIndexes.push_back(ChunkIndex);
+		}
+		else
+		{
+			Chunk.Offset = ~0ull;
+			JobCount.fetch_add(1);
+			WorkerPool.ScheduleWork([this, AttachmentBody, &Chunk, &JobCount]() {
+				std::filesystem::path Path = GetLargeChunkPath(m_TargetPath, Chunk.ChunkHash);
+				zen::CreateDirectories(Path.parent_path());
+				zen::BasicFile ChunkFile;
+				ChunkFile.Open(Path, zen::BasicFile::Mode::kTruncate);
+				uint64_t Offset = 0;
+				for (const zen::SharedBuffer& Segment : AttachmentBody.GetSegments())
+				{
+					size_t SegmentSize = Segment.GetSize();
+					ChunkFile.Write(Segment.GetData(), Segment.GetSize(), Offset);
+					Offset += SegmentSize;
+				}
+				JobCount.fetch_add(-1);
+			});
+		}
+		ChunkIndex++;
+	}
+	if (!BlockChunkIndexes.empty())
+	{
+		size_t WriteBlockOffset = CurrentBlockIndex * BlockSize;
+		WriteBlockAsync(m_TargetPath,
+						WriteBlockOffset,
+						CurrentBlockIndex,
+						BlockChunkIndexes,
+						ChunkEntries,
+						AllAttachments,
+						WorkerPool,
+						JobCount);
+	}
+
+	while (JobCount.load())
+	{
+		zen::Sleep(1);
+	}
+
+	ChunkStoreIndex.Write(ChunkEntries.data(), ChunkEntries.size() * sizeof(ChunkEntry), sizeof(ChunksHeader));
+
+	ZEN_CONSOLE("Exported {} chunks from '{}' to '{}'", AllAttachments.size(), m_HostName, m_TargetPath);
+
+	return 0;
+}
+
+////////////////////////////
+
+ImportProjectCommand::ImportProjectCommand()
+{
+	m_Options.add_options()("h,help", "Print help");
+	m_Options.add_option("", "u", "hosturl", "Host URL", cxxopts::value(m_HostName)->default_value("http://localhost:1337"), "<hosturl>");
+	m_Options.add_option("", "s", "source", "Source path", cxxopts::value(m_SourcePath), "<sourcepath>");
+	m_Options.add_option("", "p", "project", "Project name", cxxopts::value(m_ProjectName), "<projectname>");
+	m_Options.add_option("", "o", "oplog", "Oplog name", cxxopts::value(m_OplogNames), "<oplog>");
+	m_Options.parse_positional({"source", "project", "oplog"});
+}
+
+ImportProjectCommand::~ImportProjectCommand() = default;
+
+int
+ImportProjectCommand::Run(const ZenCliOptions& GlobalOptions, int argc, char** argv)
+{
+	using namespace std::literals;
+
+	ZEN_UNUSED(GlobalOptions);
+
+	if (!ParseOptions(argc, argv))
+	{
+		return 0;
+	}
+
+	if (m_ProjectName.empty())
+	{
+		ZEN_ERROR("Project name must be given");
+		return 1;
+	}
+
+	if (m_SourcePath.empty())
+	{
+		ZEN_ERROR("Source path must be given");
+		return 1;
+	}
+
+	if (!std::filesystem::is_directory(m_SourcePath))
+	{
+		ZEN_ERROR("Source path '{}' is not a directory", m_SourcePath);
+		return 1;
+	}
+
+	const std::string UrlBase = fmt::format("{}/prj", m_HostName);
+
+	cpr::Session Session;
+
+	{
+		ZEN_CONSOLE("Requesting project '{}' from '{}'", m_ProjectName, m_HostName);
+
+		zen::BasicFile ProjectStore;
+		ProjectStore.Open(GetProjectPath(m_SourcePath, m_ProjectName), zen::BasicFile::Mode::kRead);
+		zen::IoBuffer Payload = ProjectStore.ReadAll();
+
+		std::string ProjectRequest = fmt::format("{}/{}", UrlBase, m_ProjectName);
+		Session.SetUrl({ProjectRequest});
+		Session.SetBody(cpr::Body{(const char*)Payload.GetData(), Payload.GetSize()});
+		cpr::Response Response = Session.Post();
+		if (!IsSuccess(Response, ProjectRequest))
+		{
+			return 1;
+		}
+		if (m_OplogNames.empty())
+		{
+			zen::DirectoryContent Content;
+			zen::GetDirectoryContent(m_SourcePath, zen::DirectoryContent::IncludeFilesFlag, Content);
+			for (auto& File : Content.Files)
+			{
+				if (File.extension() == ".ops")
+				{
+					m_OplogNames.push_back(File.stem().string());
+				}
+			}
+		}
+	}
+
+	zen::IoBuffer		ChunkStoreIndex = zen::IoBufferBuilder::MakeFromFile(GetChunksIndexPath(m_SourcePath));
+	zen::IoBuffer		ChunkStoreHeaderMem(ChunkStoreIndex, 0, sizeof(ChunksHeader));
+	const ChunksHeader* Header = reinterpret_cast<const ChunksHeader*>(ChunkStoreHeaderMem.GetView().GetData());
+
+	if (Header->Magic != ChunksHeader::kMagic)
+	{
+		ZEN_ERROR("Invalid chunk index header");
+		return 1;
+	}
+	const size_t BlockSize = 1ull << Header->BlockSizeShift;
+
+	zen::IoBuffer	  ChunkStoreEntriesMem(ChunkStoreIndex, sizeof(Header), sizeof(ChunkEntry) * Header->ChunkCount);
+	const ChunkEntry* ChunkEntries = reinterpret_cast<const ChunkEntry*>(ChunkStoreEntriesMem.GetView().GetData());
+
+	for (const std::string& OplogName : m_OplogNames)
+	{
+		ZEN_CONSOLE("Importing oplog '{}/{}' from '{}' to '{}'", m_ProjectName, OplogName, m_SourcePath, m_HostName);
+		std::string GetOplogRequest = fmt::format("{}/{}/oplog/{}", UrlBase, m_ProjectName, OplogName);
+		Session.SetUrl(GetOplogRequest);
+		cpr::Response OplogResponse = Session.Get();
+		if (OplogResponse.status_code == static_cast<long>(zen::HttpResponseCode::NotFound))
+		{
+			OplogResponse = Session.Post();
+			if (!IsSuccess(OplogResponse, GetOplogRequest))
+			{
+				return 1;
+			}
+			IsSuccess(OplogResponse, GetOplogRequest);
+			OplogResponse = Session.Get();
+			if (!IsSuccess(OplogResponse, GetOplogRequest))
+			{
+				return 1;
+			}
+		}
+
+		zen::BasicFile OpStore;
+		OpStore.Open(GetOplogPath(m_SourcePath, OplogName), zen::BasicFile::Mode::kRead);
+		OplogHeader OplogHeader;
+		OpStore.Read(&OplogHeader, sizeof(OplogHeader), 0);
+		if (OplogHeader.Magic != OplogHeader::kMagic || OplogHeader.HeaderSize != sizeof(OplogHeader))
+		{
+			ZEN_ERROR("Invalid oplog header");
+			return 1;
+		}
+		zen::IoHash				Checksum = OplogHeader.Checksum;
+		std::vector<OplogEntry> OpEntries;
+		OpEntries.resize(OplogHeader.OpCount);
+		OpStore.Read(OpEntries.data(), sizeof(OplogEntry) * OplogHeader.OpCount, sizeof(OplogHeader));
+
+		ZEN_CONSOLE("Constructing oplog with {} ops with checksum '{}' for '{}/{}'",
+					OpEntries.size(),
+					OplogHeader.Checksum,
+					m_ProjectName,
+					OplogName);
+		zen::IoHashStream	Hasher;
+		zen::CbObjectWriter Request;
+		Request.BeginArray("entries"sv);
+		for (auto& OpEntry : OpEntries)
+		{
+			zen::IoBuffer CoreData(OpEntry.OpLength);
+			OpStore.Read(CoreData.MutableData(), OpEntry.OpLength, OpEntry.Offset);
+			Hasher.Append(CoreData.GetView());
+			zen::SharedBuffer SharedCoreData(CoreData);
+
+			zen::CbObject Op(SharedCoreData);
+			Request << Op;
+		}
+		Request.EndArray();
+		zen::IoHash CalculatedChecksum = Hasher.GetHash();
+		if (CalculatedChecksum != Checksum)
+		{
+			ZEN_ERROR("Checksum for oplog does not match. Expected '{}' but got '{}'", Checksum, CalculatedChecksum);
+			return 1;
+		}
+		Request.AddHash("checksum"sv, Checksum);
+
+		zen::CbPackage RequestPackage;
+		RequestPackage.SetObject(Request.Save());
+
+		ZEN_CONSOLE("Assembling {} attachments", Header->ChunkCount);
+		std::vector<zen::CbAttachment> Attachments;
+		Attachments.reserve(Header->ChunkCount);
+		uint32_t	  ReadBlockIndex = 0;
+		zen::IoBuffer BlockStore	 = zen::IoBufferBuilder::MakeFromFile(GetChunksPath(m_SourcePath, ReadBlockIndex));
+		for (uint64_t ChunkIndex = 0; ChunkIndex < Header->ChunkCount; ++ChunkIndex)
+		{
+			const ChunkEntry& ChunkEntry = ChunkEntries[ChunkIndex];
+			if (ChunkEntry.Offset == ~0ull)
+			{
+				zen::IoBuffer ChunkBuffer	= zen::IoBufferBuilder::MakeFromFile(GetLargeChunkPath(m_SourcePath, ChunkEntry.ChunkHash));
+				zen::CompressedBuffer Chunk = zen::CompressedBuffer::FromCompressedNoValidate(std::move(ChunkBuffer));
+				ZEN_ASSERT(Chunk);
+				Attachments.push_back(zen::CbAttachment(Chunk, ChunkEntry.ChunkHash));
+			}
+			else
+			{
+				uint32_t BlockIndex = gsl::narrow<uint32_t>(ChunkEntry.Offset / BlockSize);
+				if (BlockIndex != ReadBlockIndex)
+				{
+					ReadBlockIndex = BlockIndex;
+					BlockStore	   = zen::IoBufferBuilder::MakeFromFile(GetChunksPath(m_SourcePath, ReadBlockIndex));
+					ZEN_ASSERT(BlockStore);
+				}
+				size_t				  BlockOffset		   = BlockIndex * BlockSize;
+				size_t				  AttachmentBulkOffset = ChunkEntry.Offset - BlockOffset;
+				zen::IoBuffer		  ChunkBuffer(BlockStore, AttachmentBulkOffset, ChunkEntry.Length);
+				zen::CompressedBuffer Chunk = zen::CompressedBuffer::FromCompressedNoValidate(std::move(ChunkBuffer));
+				Attachments.push_back(zen::CbAttachment(Chunk, ChunkEntry.ChunkHash));
+			}
+		}
+		RequestPackage.AddAttachments(Attachments);
+
+		ZEN_CONSOLE("Sending oplog with {} ops and {} attachments for '{}/{}' to {}",
+					OpEntries.size(),
+					Header->ChunkCount,
+					m_ProjectName,
+					OplogName,
+					m_HostName);
+		std::vector<zen::IoBuffer>	   RequestPayload = zen::FormatPackageMessage(RequestPackage, zen::FormatFlags::kAllowLocalReferences);
+		std::vector<zen::SharedBuffer> Parts;
+		Parts.reserve(RequestPayload.size());
+		for (const auto& I : RequestPayload)
+		{
+			Parts.emplace_back(zen::SharedBuffer(I));
+		}
+		zen::CompositeBuffer  Cmp(std::move(Parts));
+		zen::CompressedBuffer CompressedRequest = zen::CompressedBuffer::Compress(Cmp);
+
+		std::string AppendOplogRequest = fmt::format("{}/{}/oplog/{}/archive", UrlBase, m_ProjectName, OplogName);
+		Session.SetUrl(AppendOplogRequest);
+
+		zen::IoBuffer TmpBuffer = CompressedRequest.GetCompressed().Flatten().AsIoBuffer();
+		Session.SetBody(cpr::Body{(const char*)TmpBuffer.GetData(), TmpBuffer.GetSize()});
+		cpr::Response Response = Session.Post();
+		if (!IsSuccess(Response, AppendOplogRequest))
+		{
+			return 1;
+		}
+
+		ZEN_CONSOLE("Imported {} ops and {} chunks", OpEntries.size(), Header->ChunkCount);
+	}
+	return 0;
+}