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// Copyright 2014 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <algorithm>
#include <atomic>
#include <chrono>
#include <climits>
#include <condition_variable>
#include <memory>
#include <mutex>
#include <thread>
#include <vector>
#ifdef _WIN32
#include <windows.h> // For OutputDebugStringW
#endif
#include "common/assert.h"
#include "common/fs/file.h"
#include "common/fs/fs.h"
#include "common/logging/backend.h"
#include "common/logging/log.h"
#include "common/logging/text_formatter.h"
#include "common/settings.h"
#include "common/string_util.h"
#include "common/threadsafe_queue.h"
namespace Common::Log {
/**
* Static state as a singleton.
*/
class Impl {
public:
static Impl& Instance() {
static Impl backend;
return backend;
}
Impl(const Impl&) = delete;
Impl& operator=(const Impl&) = delete;
Impl(Impl&&) = delete;
Impl& operator=(Impl&&) = delete;
void PushEntry(Class log_class, Level log_level, const char* filename, unsigned int line_num,
const char* function, std::string message) {
message_queue.Push(
CreateEntry(log_class, log_level, filename, line_num, function, std::move(message)));
}
void AddBackend(std::unique_ptr<Backend> backend) {
std::lock_guard lock{writing_mutex};
backends.push_back(std::move(backend));
}
void RemoveBackend(std::string_view backend_name) {
std::lock_guard lock{writing_mutex};
std::erase_if(backends, [&backend_name](const auto& backend) {
return backend_name == backend->GetName();
});
}
const Filter& GetGlobalFilter() const {
return filter;
}
void SetGlobalFilter(const Filter& f) {
filter = f;
}
Backend* GetBackend(std::string_view backend_name) {
const auto it =
std::find_if(backends.begin(), backends.end(),
[&backend_name](const auto& i) { return backend_name == i->GetName(); });
if (it == backends.end())
return nullptr;
return it->get();
}
private:
Impl() {
backend_thread = std::thread([&] {
Entry entry;
auto write_logs = [&](Entry& e) {
std::lock_guard lock{writing_mutex};
for (const auto& backend : backends) {
backend->Write(e);
}
};
while (true) {
entry = message_queue.PopWait();
if (entry.final_entry) {
break;
}
write_logs(entry);
}
// Drain the logging queue. Only writes out up to MAX_LOGS_TO_WRITE to prevent a case
// where a system is repeatedly spamming logs even on close.
const int MAX_LOGS_TO_WRITE = filter.IsDebug() ? INT_MAX : 100;
int logs_written = 0;
while (logs_written++ < MAX_LOGS_TO_WRITE && message_queue.Pop(entry)) {
write_logs(entry);
}
});
}
~Impl() {
Entry entry;
entry.final_entry = true;
message_queue.Push(entry);
backend_thread.join();
}
Entry CreateEntry(Class log_class, Level log_level, const char* filename, unsigned int line_nr,
const char* function, std::string message) const {
using std::chrono::duration_cast;
using std::chrono::microseconds;
using std::chrono::steady_clock;
return {
.timestamp = duration_cast<microseconds>(steady_clock::now() - time_origin),
.log_class = log_class,
.log_level = log_level,
.filename = filename,
.line_num = line_nr,
.function = function,
.message = std::move(message),
.final_entry = false,
};
}
std::mutex writing_mutex;
std::thread backend_thread;
std::vector<std::unique_ptr<Backend>> backends;
MPSCQueue<Entry> message_queue;
Filter filter;
std::chrono::steady_clock::time_point time_origin{std::chrono::steady_clock::now()};
};
ConsoleBackend::~ConsoleBackend() = default;
void ConsoleBackend::Write(const Entry& entry) {
PrintMessage(entry);
}
ColorConsoleBackend::~ColorConsoleBackend() = default;
void ColorConsoleBackend::Write(const Entry& entry) {
PrintColoredMessage(entry);
}
FileBackend::FileBackend(const std::filesystem::path& filename) {
auto old_filename = filename;
old_filename += ".old.txt";
// Existence checks are done within the functions themselves.
// We don't particularly care if these succeed or not.
void(FS::RemoveFile(old_filename));
void(FS::RenameFile(filename, old_filename));
file =
std::make_unique<FS::IOFile>(filename, FS::FileAccessMode::Write, FS::FileType::TextFile);
}
FileBackend::~FileBackend() = default;
void FileBackend::Write(const Entry& entry) {
// prevent logs from going over the maximum size (in case its spamming and the user doesn't
// know)
constexpr std::size_t MAX_BYTES_WRITTEN = 100 * 1024 * 1024;
constexpr std::size_t MAX_BYTES_WRITTEN_EXTENDED = 1024 * 1024 * 1024;
if (!file->IsOpen()) {
return;
}
if (Settings::values.extended_logging && bytes_written > MAX_BYTES_WRITTEN_EXTENDED) {
return;
} else if (!Settings::values.extended_logging && bytes_written > MAX_BYTES_WRITTEN) {
return;
}
bytes_written += file->WriteString(FormatLogMessage(entry).append(1, '\n'));
if (entry.log_level >= Level::Error) {
void(file->Flush());
}
}
DebuggerBackend::~DebuggerBackend() = default;
void DebuggerBackend::Write(const Entry& entry) {
#ifdef _WIN32
::OutputDebugStringW(UTF8ToUTF16W(FormatLogMessage(entry).append(1, '\n')).c_str());
#endif
}
void SetGlobalFilter(const Filter& filter) {
Impl::Instance().SetGlobalFilter(filter);
}
void AddBackend(std::unique_ptr<Backend> backend) {
Impl::Instance().AddBackend(std::move(backend));
}
void RemoveBackend(std::string_view backend_name) {
Impl::Instance().RemoveBackend(backend_name);
}
Backend* GetBackend(std::string_view backend_name) {
return Impl::Instance().GetBackend(backend_name);
}
void FmtLogMessageImpl(Class log_class, Level log_level, const char* filename,
unsigned int line_num, const char* function, const char* format,
const fmt::format_args& args) {
auto& instance = Impl::Instance();
const auto& filter = instance.GetGlobalFilter();
if (!filter.CheckMessage(log_class, log_level))
return;
instance.PushEntry(log_class, log_level, filename, line_num, function,
fmt::vformat(format, args));
}
} // namespace Common::Log
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