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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 <share.h> // For _SH_DENYWR
#else
#define _SH_DENYWR 0
#endif
#include "common/assert.h"
#include "common/logging/backend.h"
#include "common/logging/log.h"
#include "common/logging/text_formatter.h"
#include "common/string_util.h"
#include "common/threadsafe_queue.h"
namespace Log {
/**
* Static state as a singleton.
*/
class Impl {
public:
static Impl& Instance() {
static Impl backend;
return backend;
}
Impl(Impl const&) = delete;
const Impl& operator=(Impl const&) = delete;
void PushEntry(Entry e) {
std::lock_guard<std::mutex> lock(message_mutex);
message_queue.Push(std::move(e));
message_cv.notify_one();
}
void AddBackend(std::unique_ptr<Backend> backend) {
std::lock_guard<std::mutex> lock(writing_mutex);
backends.push_back(std::move(backend));
}
void RemoveBackend(std::string_view backend_name) {
std::lock_guard<std::mutex> lock(writing_mutex);
const auto it =
std::remove_if(backends.begin(), backends.end(),
[&backend_name](const auto& i) { return backend_name == i->GetName(); });
backends.erase(it, backends.end());
}
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<std::mutex> lock(writing_mutex);
for (const auto& backend : backends) {
backend->Write(e);
}
};
while (true) {
{
std::unique_lock<std::mutex> lock(message_mutex);
message_cv.wait(lock, [&] { return !running || message_queue.Pop(entry); });
}
if (!running) {
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() {
running = false;
message_cv.notify_one();
backend_thread.join();
}
std::atomic_bool running{true};
std::mutex message_mutex, writing_mutex;
std::condition_variable message_cv;
std::thread backend_thread;
std::vector<std::unique_ptr<Backend>> backends;
Common::MPSCQueue<Log::Entry> message_queue;
Filter filter;
};
void ConsoleBackend::Write(const Entry& entry) {
PrintMessage(entry);
}
void ColorConsoleBackend::Write(const Entry& entry) {
PrintColoredMessage(entry);
}
// _SH_DENYWR allows read only access to the file for other programs.
// It is #defined to 0 on other platforms
FileBackend::FileBackend(const std::string& filename)
: file(filename, "w", _SH_DENYWR), bytes_written(0) {}
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 size_t MAX_BYTES_WRITTEN = 50 * 1024L * 1024L;
if (!file.IsOpen() || bytes_written > MAX_BYTES_WRITTEN) {
return;
}
bytes_written += file.WriteString(FormatLogMessage(entry) + '\n');
if (entry.log_level >= Level::Error) {
file.Flush();
}
}
/// Macro listing all log classes. Code should define CLS and SUB as desired before invoking this.
#define ALL_LOG_CLASSES() \
CLS(Log) \
CLS(Common) \
SUB(Common, Filesystem) \
SUB(Common, Memory) \
CLS(Core) \
SUB(Core, ARM) \
SUB(Core, Timing) \
CLS(Config) \
CLS(Debug) \
SUB(Debug, Emulated) \
SUB(Debug, GPU) \
SUB(Debug, Breakpoint) \
SUB(Debug, GDBStub) \
CLS(Kernel) \
SUB(Kernel, SVC) \
CLS(Service) \
SUB(Service, ACC) \
SUB(Service, Audio) \
SUB(Service, AM) \
SUB(Service, AOC) \
SUB(Service, APM) \
SUB(Service, BCAT) \
SUB(Service, Fatal) \
SUB(Service, Friend) \
SUB(Service, FS) \
SUB(Service, HID) \
SUB(Service, LBL) \
SUB(Service, LDN) \
SUB(Service, LM) \
SUB(Service, MM) \
SUB(Service, NFP) \
SUB(Service, NIFM) \
SUB(Service, NS) \
SUB(Service, NVDRV) \
SUB(Service, PCTL) \
SUB(Service, PREPO) \
SUB(Service, SET) \
SUB(Service, SM) \
SUB(Service, SPL) \
SUB(Service, SSL) \
SUB(Service, Time) \
SUB(Service, VI) \
CLS(HW) \
SUB(HW, Memory) \
SUB(HW, LCD) \
SUB(HW, GPU) \
SUB(HW, AES) \
CLS(IPC) \
CLS(Frontend) \
CLS(Render) \
SUB(Render, Software) \
SUB(Render, OpenGL) \
CLS(Audio) \
SUB(Audio, DSP) \
SUB(Audio, Sink) \
CLS(Input) \
CLS(Network) \
CLS(Loader) \
CLS(WebService)
// GetClassName is a macro defined by Windows.h, grrr...
const char* GetLogClassName(Class log_class) {
switch (log_class) {
#define CLS(x) \
case Class::x: \
return #x;
#define SUB(x, y) \
case Class::x##_##y: \
return #x "." #y;
ALL_LOG_CLASSES()
#undef CLS
#undef SUB
case Class::Count:
UNREACHABLE();
}
}
const char* GetLevelName(Level log_level) {
#define LVL(x) \
case Level::x: \
return #x
switch (log_level) {
LVL(Trace);
LVL(Debug);
LVL(Info);
LVL(Warning);
LVL(Error);
LVL(Critical);
case Level::Count:
UNREACHABLE();
}
#undef LVL
}
Entry CreateEntry(Class log_class, Level log_level, const char* filename, unsigned int line_nr,
const char* function, std::string message) {
using std::chrono::duration_cast;
using std::chrono::steady_clock;
static steady_clock::time_point time_origin = steady_clock::now();
Entry entry;
entry.timestamp = duration_cast<std::chrono::microseconds>(steady_clock::now() - time_origin);
entry.log_class = log_class;
entry.log_level = log_level;
entry.filename = Common::TrimSourcePath(filename);
entry.line_num = line_nr;
entry.function = function;
entry.message = std::move(message);
return entry;
}
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 filter = Impl::Instance().GetGlobalFilter();
if (!filter.CheckMessage(log_class, log_level))
return;
Entry entry =
CreateEntry(log_class, log_level, filename, line_num, function, fmt::vformat(format, args));
Impl::Instance().PushEntry(std::move(entry));
}
} // namespace Log
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