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Added some simple log rotation

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7b97967 / Martin Ridgers / 2021-08-26 11:03:24 +0200

[CL 17384986 by Martin Ridgers in ue5-main branch]
This commit is contained in:
Martin Ridgers
2021-09-01 07:37:58 -04:00
parent 3e9edd7bfe
commit e0b3d3389e
2 changed files with 57 additions and 9 deletions
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65
Engine/Source/Programs/UnrealTraceServer/src/Main.cpp
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@@ -136,25 +136,72 @@ FLogging* FLogging::Instance = nullptr;
////////////////////////////////////////////////////////////////////////////////
FLogging::FLogging()
{
std::filesystem::path LogPath;
std::filesystem::path LogDir;
// Find where the logs should be written to. Make sure it exists.
#if TS_USING(TS_PLATFORM_WINDOWS)
GetUnrealTraceHome(LogPath, true);
LogPath /= "Server.log";
File = _wfopen(LogPath.c_str(), L"wb");
GetUnrealTraceHome(LogDir, true);
#else
# if TS_USING(TS_PLATFORM_MAC)
int UserId = getuid();
const passwd* Passwd = getpwuid(UserId);
LogPath = Passwd->pw_dir;
LogPath /= "Library/Logs/Unreal Engine/UnrealTrace/Server.log";
LogDir = Passwd->pw_dir;
LogDir /= "Library/Logs/Unreal Engine/UnrealTrace";
# else
LogPath = "/var/log/UnrealTrace/Server.log";
LogDir = "/var/log/UnrealTrace";
# endif
std::filesystem::create_directories(LogPath.parent_path());
File = fopen(LogPath.c_str(), "wb");
std::filesystem::create_directories(LogDir.parent_path());
#endif // !TS_PLATFORM_WINDOWS
// Fetch all existing logs.
struct FExistingLog
{
std::filesystem::path Path;
uint32 Index;
int32 operator < (const FExistingLog& Rhs) const
{
return Index < Rhs.Index;
}
};
std::vector<FExistingLog> ExistingLogs;
for (const auto& DirItem : std::filesystem::directory_iterator(LogDir))
{
int32 Index = -1;
std::string StemUtf8 = DirItem.path().stem().string();
sscanf(StemUtf8.c_str(), "Server_%d", &Index);
if (Index >= 0)
{
ExistingLogs.push_back({
DirItem.path(),
uint32(Index)
});
}
}
// Sort and try and tidy up old logs.
static int32 MaxLogs = 12; // plus one new one
std::sort(ExistingLogs.begin(), ExistingLogs.end());
for (int32 i = 0, n = int32(ExistingLogs.size() - MaxLogs); i < n; ++i)
{
std::error_code ErrorCode;
std::filesystem::remove(ExistingLogs[i].Path, ErrorCode);
}
// Open the log file (note; can race other instances)
uint32 LogIndex = ExistingLogs.empty() ? 0 : ExistingLogs.back().Index;
for (; LogIndex++, File == nullptr;)
{
std::filesystem::path LogPath = LogDir / std::format("Server_{}.log", LogIndex);
#if TS_USING(TS_PLATFORM_WINDOWS)
File = _wfopen(LogPath.c_str(), L"wbxN");
#else
File = fopen(LogPath.c_str(), "wbx");
#endif
}
while (File == nullptr);
}
////////////////////////////////////////////////////////////////////////////////

1
Engine/Source/Programs/UnrealTraceServer/src/Pch.h
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@@ -64,6 +64,7 @@
#include <cstdint>
#include <ctime>
#include <filesystem>
#include <format>
#include <string>
#include <string_view>
#include <vector>