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// Copyright Epic Games, Inc. All Rights Reserved.
#include "httptrafficrecorder.h"
#include <zencore/compactbinarybuilder.h>
#include <zencore/logging.h>
#include <chrono>
#include <filesystem>
namespace zen {
HttpTrafficRecorder::HttpTrafficRecorder(const std::filesystem::path& OutputDir, std::string_view ClientLabel, std::string_view TargetLabel)
: m_Log(logging::Get("proxy.record"))
, m_Dir(OutputDir)
, m_ClientLabel(ClientLabel)
, m_TargetLabel(TargetLabel)
{
auto Now = std::chrono::system_clock::now();
m_StartTimeMs = uint64_t(std::chrono::duration_cast<std::chrono::milliseconds>(Now.time_since_epoch()).count());
std::error_code Ec;
std::filesystem::create_directories(m_Dir, Ec);
if (Ec)
{
ZEN_WARN("failed to create recording directory {} - {}", m_Dir.string(), Ec.message());
return;
}
std::error_code ReqEc;
m_RequestFile.Open(m_Dir / "request.bin", BasicFile::Mode::kTruncate, ReqEc);
if (ReqEc)
{
ZEN_WARN("failed to open request.bin in {} - {}", m_Dir.string(), ReqEc.message());
return;
}
std::error_code RespEc;
m_ResponseFile.Open(m_Dir / "response.bin", BasicFile::Mode::kTruncate, RespEc);
if (RespEc)
{
ZEN_WARN("failed to open response.bin in {} - {}", m_Dir.string(), RespEc.message());
m_RequestFile.Close();
return;
}
m_Valid = true;
ZEN_DEBUG("recording started in {}", m_Dir.string());
}
HttpTrafficRecorder::~HttpTrafficRecorder()
{
if (m_Valid && !m_Finalized)
{
Finalize(false, Oid::Zero);
}
}
void
HttpTrafficRecorder::WriteRequest(const char* Data, size_t Length)
{
if (!m_Valid)
{
return;
}
m_RequestFile.Write(Data, Length, m_RequestOffset);
m_RequestOffset += Length;
}
void
HttpTrafficRecorder::WriteResponse(const char* Data, size_t Length)
{
if (!m_Valid)
{
return;
}
m_ResponseFile.Write(Data, Length, m_ResponseOffset);
m_ResponseOffset += Length;
}
void
HttpTrafficRecorder::OnMessageComplete(HttpTrafficInspector::Direction Dir,
std::string_view Method,
std::string_view Url,
uint16_t StatusCode,
int64_t /*ContentLength*/)
{
if (!m_Valid)
{
return;
}
if (Dir == HttpTrafficInspector::Direction::Request)
{
// Record the request boundary. The request spans from m_CurrentRequestStart to m_RequestOffset.
m_PendingReqOffset = m_CurrentRequestStart;
m_PendingReqSize = m_RequestOffset - m_CurrentRequestStart;
m_PendingMethod = Method;
m_PendingUrl = Url;
m_HasPendingRequest = true;
// Advance start to current offset for the next request.
m_CurrentRequestStart = m_RequestOffset;
}
else
{
// Response complete -- pair with pending request.
RecordedEntry Entry;
if (m_HasPendingRequest)
{
Entry.ReqOffset = m_PendingReqOffset;
Entry.ReqSize = m_PendingReqSize;
Entry.Method = std::move(m_PendingMethod);
Entry.Url = std::move(m_PendingUrl);
m_HasPendingRequest = false;
}
Entry.RespOffset = m_CurrentResponseStart;
Entry.RespSize = m_ResponseOffset - m_CurrentResponseStart;
Entry.Status = StatusCode;
m_Entries.push_back(std::move(Entry));
// Advance start to current offset for the next response.
m_CurrentResponseStart = m_ResponseOffset;
}
}
void
HttpTrafficRecorder::Finalize(bool WebSocket, const Oid& SessionId)
{
if (!m_Valid || m_Finalized)
{
return;
}
m_Finalized = true;
m_RequestFile.Close();
m_ResponseFile.Close();
// Write index.ucb as a CbObject.
CbObjectWriter Cbo;
Cbo << "client" << std::string_view(m_ClientLabel);
Cbo << "target" << std::string_view(m_TargetLabel);
Cbo << "startTime" << m_StartTimeMs;
Cbo << "websocket" << WebSocket;
if (SessionId != Oid::Zero)
{
std::string SessionIdStr = SessionId.ToString();
Cbo << "sessionId" << std::string_view(SessionIdStr);
}
Cbo.BeginArray("entries");
for (const RecordedEntry& Entry : m_Entries)
{
Cbo.BeginObject();
Cbo << "reqOffset" << Entry.ReqOffset;
Cbo << "reqSize" << Entry.ReqSize;
Cbo << "respOffset" << Entry.RespOffset;
Cbo << "respSize" << Entry.RespSize;
Cbo << "method" << std::string_view(Entry.Method);
Cbo << "url" << std::string_view(Entry.Url);
Cbo << "status" << Entry.Status;
Cbo.EndObject();
}
Cbo.EndArray();
CbObject IndexObj = Cbo.Save();
MemoryView View = IndexObj.GetView();
std::error_code Ec;
BasicFile IndexFile(m_Dir / "index.ucb", BasicFile::Mode::kTruncate, Ec);
if (!Ec)
{
IndexFile.Write(View, 0, Ec);
if (Ec)
{
ZEN_WARN("failed to write index.ucb in {} - {}", m_Dir.string(), Ec.message());
}
IndexFile.Close();
}
else
{
ZEN_WARN("failed to create index.ucb in {} - {}", m_Dir.string(), Ec.message());
}
ZEN_DEBUG("recording finalized in {} ({} entries, websocket: {})", m_Dir.string(), m_Entries.size(), WebSocket);
}
} // namespace zen
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