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// Copyright Epic Games, Inc. All Rights Reserved.
#include <zenutil/logging/jsonformatter.h>
#include <zencore/logging/helpers.h>
#include <zencore/memory/llm.h>
#include <zencore/thread.h>
#include <zencore/zencore.h>
#include <chrono>
#include <string>
#include <unordered_map>
namespace zen::logging {
using namespace std::literals;
static void
WriteEscapedString(MemoryBuffer& Dest, std::string_view Text)
{
// Strip ANSI SGR sequences before escaping so they don't appear in JSON output
static const auto IsEscapeStart = [](char C) { return C == '\033'; };
const char* RangeStart = Text.data();
const char* End = Text.data() + Text.size();
static const std::unordered_map<char, std::string_view> SpecialCharacterMap{
{'\b', "\\b"sv},
{'\f', "\\f"sv},
{'\n', "\\n"sv},
{'\r', "\\r"sv},
{'\t', "\\t"sv},
{'"', "\\\""sv},
{'\\', "\\\\"sv},
};
for (const char* It = RangeStart; It != End; ++It)
{
// Skip ANSI SGR escape sequences (\033[...m)
if (*It == '\033' && (It + 1) < End && *(It + 1) == '[')
{
if (RangeStart != It)
{
Dest.append(RangeStart, It);
}
const char* Seq = It + 2;
while (Seq < End && *Seq != 'm')
{
++Seq;
}
if (Seq < End)
{
++Seq; // skip 'm'
}
It = Seq - 1; // -1 because the for loop will ++It
RangeStart = Seq;
continue;
}
if (auto SpecialIt = SpecialCharacterMap.find(*It); SpecialIt != SpecialCharacterMap.end())
{
if (RangeStart != It)
{
Dest.append(RangeStart, It);
}
helpers::AppendStringView(SpecialIt->second, Dest);
RangeStart = It + 1;
}
}
if (RangeStart != End)
{
Dest.append(RangeStart, End);
}
}
struct JsonFormatter::Impl
{
explicit Impl(std::string_view LogId) : m_LogId(LogId) {}
std::tm m_CachedTm{0, 0, 0, 0, 0, 0, 0, 0, 0};
std::chrono::seconds m_LastLogSecs{0};
MemoryBuffer m_CachedDatetime;
std::string m_LogId;
RwLock m_TimestampLock;
};
JsonFormatter::JsonFormatter(std::string_view LogId) : m_Impl(std::make_unique<Impl>(LogId))
{
}
JsonFormatter::~JsonFormatter() = default;
std::unique_ptr<Formatter>
JsonFormatter::Clone() const
{
return std::make_unique<JsonFormatter>(m_Impl->m_LogId);
}
void
JsonFormatter::Format(const LogMessage& Msg, MemoryBuffer& Dest)
{
ZEN_MEMSCOPE(ELLMTag::Logging);
using std::chrono::duration_cast;
using std::chrono::milliseconds;
using std::chrono::seconds;
auto Secs = duration_cast<seconds>(Msg.GetTime().time_since_epoch());
if (Secs != m_Impl->m_LastLogSecs)
{
RwLock::ExclusiveLockScope _(m_Impl->m_TimestampLock);
m_Impl->m_CachedTm = helpers::SafeLocaltime(LogClock::to_time_t(Msg.GetTime()));
m_Impl->m_LastLogSecs = Secs;
// cache the date/time part for the next second.
m_Impl->m_CachedDatetime.clear();
helpers::AppendInt(m_Impl->m_CachedTm.tm_year + 1900, m_Impl->m_CachedDatetime);
m_Impl->m_CachedDatetime.push_back('-');
helpers::Pad2(m_Impl->m_CachedTm.tm_mon + 1, m_Impl->m_CachedDatetime);
m_Impl->m_CachedDatetime.push_back('-');
helpers::Pad2(m_Impl->m_CachedTm.tm_mday, m_Impl->m_CachedDatetime);
m_Impl->m_CachedDatetime.push_back(' ');
helpers::Pad2(m_Impl->m_CachedTm.tm_hour, m_Impl->m_CachedDatetime);
m_Impl->m_CachedDatetime.push_back(':');
helpers::Pad2(m_Impl->m_CachedTm.tm_min, m_Impl->m_CachedDatetime);
m_Impl->m_CachedDatetime.push_back(':');
helpers::Pad2(m_Impl->m_CachedTm.tm_sec, m_Impl->m_CachedDatetime);
m_Impl->m_CachedDatetime.push_back('.');
}
helpers::AppendStringView("{"sv, Dest);
helpers::AppendStringView("\"time\": \""sv, Dest);
{
RwLock::SharedLockScope _(m_Impl->m_TimestampLock);
Dest.append(m_Impl->m_CachedDatetime.begin(), m_Impl->m_CachedDatetime.end());
}
auto Millis = helpers::TimeFraction<milliseconds>(Msg.GetTime());
helpers::Pad3(static_cast<uint32_t>(Millis.count()), Dest);
helpers::AppendStringView("\", "sv, Dest);
helpers::AppendStringView("\"status\": \""sv, Dest);
helpers::AppendStringView(helpers::LevelToShortString(Msg.GetLevel()), Dest);
helpers::AppendStringView("\", "sv, Dest);
helpers::AppendStringView("\"source\": \""sv, Dest);
helpers::AppendStringView("zenserver"sv, Dest);
helpers::AppendStringView("\", "sv, Dest);
helpers::AppendStringView("\"service\": \""sv, Dest);
helpers::AppendStringView("zencache"sv, Dest);
helpers::AppendStringView("\", "sv, Dest);
if (!m_Impl->m_LogId.empty())
{
helpers::AppendStringView("\"id\": \""sv, Dest);
helpers::AppendStringView(m_Impl->m_LogId, Dest);
helpers::AppendStringView("\", "sv, Dest);
}
if (Msg.GetLoggerName().size() > 0)
{
helpers::AppendStringView("\"logger.name\": \""sv, Dest);
helpers::AppendStringView(Msg.GetLoggerName(), Dest);
helpers::AppendStringView("\", "sv, Dest);
}
if (Msg.GetThreadId() != 0)
{
helpers::AppendStringView("\"logger.thread_name\": \""sv, Dest);
helpers::PadUint(Msg.GetThreadId(), 0, Dest);
helpers::AppendStringView("\", "sv, Dest);
}
if (Msg.GetSource())
{
helpers::AppendStringView("\"file\": \""sv, Dest);
WriteEscapedString(Dest, helpers::ShortFilename(Msg.GetSource().Filename));
helpers::AppendStringView("\","sv, Dest);
helpers::AppendStringView("\"line\": \""sv, Dest);
helpers::AppendInt(Msg.GetSource().Line, Dest);
helpers::AppendStringView("\","sv, Dest);
}
helpers::AppendStringView("\"message\": \""sv, Dest);
WriteEscapedString(Dest, Msg.GetPayload());
helpers::AppendStringView("\""sv, Dest);
helpers::AppendStringView("}\n"sv, Dest);
}
} // namespace zen::logging
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