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azahar/src/common/logging/backend.cpp
BreadFish64 36e368ff99 remove Common::TrimSourcePath 
wwylele / 白疾風Today at 6:14 PM
I doubt the performance of constructing regex everytime the function is called
Is TrimSourcePath only called by logging? if so, you can move the implementation into logging, and cache the regex object into global
This function is probably too specific to be in common anyway
2019-03-10 19:18:09 -05:00

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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 <condition_variable>
#include <memory>
#include <mutex>
#include <regex>
#include <thread>
#include <vector>
#ifdef _WIN32
#include <share.h> // For _SH_DENYWR
#include <windows.h> // For OutputDebugStringW
#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) {
message_queue.Push(std::move(e));
}
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) {
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.
constexpr int MAX_LOGS_TO_WRITE = 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();
}
std::mutex writing_mutex;
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 std::size_t MAX_BYTES_WRITTEN = 50 * 1024L * 1024L;
if (!file.IsOpen() || bytes_written > MAX_BYTES_WRITTEN) {
return;
}
bytes_written += file.WriteString(FormatLogMessage(entry).append(1, '\n'));
if (entry.log_level >= Level::Error) {
file.Flush();
}
}
void DebuggerBackend::Write(const Entry& entry) {
#ifdef _WIN32
::OutputDebugStringW(Common::UTF8ToUTF16W(FormatLogMessage(entry).append(1, '\n')).c_str());
#endif
}
/// 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, ARM11) \
SUB(Core, Timing) \
SUB(Core, Cheats) \
CLS(Config) \
CLS(Debug) \
SUB(Debug, Emulated) \
SUB(Debug, GPU) \
SUB(Debug, Breakpoint) \
SUB(Debug, GDBStub) \
CLS(Kernel) \
SUB(Kernel, SVC) \
CLS(Applet) \
SUB(Applet, SWKBD) \
CLS(Service) \
SUB(Service, SRV) \
SUB(Service, FRD) \
SUB(Service, FS) \
SUB(Service, ERR) \
SUB(Service, APT) \
SUB(Service, BOSS) \
SUB(Service, GSP) \
SUB(Service, AC) \
SUB(Service, AM) \
SUB(Service, PTM) \
SUB(Service, LDR) \
SUB(Service, MIC) \
SUB(Service, NDM) \
SUB(Service, NFC) \
SUB(Service, NIM) \
SUB(Service, NS) \
SUB(Service, NWM) \
SUB(Service, CAM) \
SUB(Service, CECD) \
SUB(Service, CFG) \
SUB(Service, CSND) \
SUB(Service, DSP) \
SUB(Service, DLP) \
SUB(Service, HID) \
SUB(Service, HTTP) \
SUB(Service, SOC) \
SUB(Service, IR) \
SUB(Service, Y2R) \
CLS(HW) \
SUB(HW, Memory) \
SUB(HW, LCD) \
SUB(HW, GPU) \
SUB(HW, AES) \
CLS(Frontend) \
CLS(Render) \
SUB(Render, Software) \
SUB(Render, OpenGL) \
CLS(Audio) \
SUB(Audio, DSP) \
SUB(Audio, Sink) \
CLS(Input) \
CLS(Network) \
CLS(Movie) \
CLS(Loader) \
CLS(WebService) \
CLS(RPC_Server)
// 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;
// matches from the beginning up to the last '../' or 'src/'
static const std::regex trim_source_path(R"(.*([\/\\]|^)((\.\.)|(src))[\/\\])");
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 = std::regex_replace(filename, trim_source_path, "");
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& instance = Impl::Instance();
const auto& filter = 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));
instance.PushEntry(std::move(entry));
}
} // namespace Log
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