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#include "cru/base/log/Logger.h"
#include "cru/base/StringUtil.h"
#include "cru/base/log/StdioLogTarget.h"
#include <algorithm>
#include <chrono>
#include <condition_variable>
#include <cstdlib>
#include <ctime>
#include <format>
#include <iostream>
#include <memory>
#include <mutex>
#ifdef _WIN32
#include "cru/base/platform/win/DebugLogTarget.h"
#endif
namespace cru::log {
ILogger* ILogger::GetInstance() {
static SimpleStdioLogger logger;
logger.LoadDebugTagFromEnv();
return &logger;
}
namespace {
const char* LogLevelToString(LogLevel level) {
switch (level) {
case LogLevel::Debug:
return "DEBUG";
case LogLevel::Info:
return "INFO";
case LogLevel::Warn:
return "WARN";
case LogLevel::Error:
return "ERROR";
default:
std::terminate();
}
}
std::string GetLogTime() {
auto time = std::time(nullptr);
auto calendar = std::localtime(&time);
return std::format("{}:{}:{}", calendar->tm_hour, calendar->tm_min,
calendar->tm_sec);
}
std::string MakeLogFinalMessage(const LogInfo& log_info) {
return std::format("[{}] {} {}: {}", GetLogTime(),
LogLevelToString(log_info.level), log_info.tag,
log_info.message);
}
} // namespace
void ILogger::LoadDebugTagFromEnv(const char* env_var, std::string sep) {
auto env = std::getenv(env_var);
if (env != nullptr) {
for (auto tag : cru::string::Split(std::string(env), sep)) {
AddDebugTag(std::move(tag));
}
}
}
void SimpleStdioLogger::AddDebugTag(std::string tag) {
debug_tags_.insert(tag);
}
void SimpleStdioLogger::RemoveDebugTag(const std::string& tag) {
debug_tags_.erase(tag);
}
void SimpleStdioLogger::Log(LogInfo log_info) {
if (log_info.level == LogLevel::Debug &&
std::ranges::none_of(debug_tags_, [&log_info](const std::string& tag) {
return log_info.tag.starts_with(tag);
})) {
return;
}
std::clog << MakeLogFinalMessage(log_info) << std::endl;
}
Logger::Logger() : log_stop_(false), log_thread_(&Logger::LogThreadRun, this) {
AddLogTarget(std::make_unique<StdioLogTarget>());
#ifdef _WIN32
AddLogTarget(std::make_unique<platform::win::WinDebugLogTarget>());
#endif
}
Logger::~Logger() {
{
std::unique_lock lock(log_queue_mutex_);
log_stop_ = true;
log_queue_condition_variable_.notify_one();
}
log_thread_.join();
}
void Logger::AddDebugTag(std::string tag) {
std::unique_lock lock(log_queue_mutex_);
debug_tags_.insert(std::move(tag));
}
void Logger::RemoveDebugTag(const std::string& tag) {
std::unique_lock lock(log_queue_mutex_);
debug_tags_.erase(tag);
}
void Logger::AddLogTarget(std::unique_ptr<ILogTarget> target) {
std::lock_guard<std::mutex> lock(target_list_mutex_);
target_list_.push_back(std::move(target));
}
void Logger::RemoveLogTarget(ILogTarget* target) {
std::lock_guard<std::mutex> lock(target_list_mutex_);
target_list_.erase(
std::remove_if(target_list_.begin(), target_list_.end(),
[target](const auto& t) { return t.get() == target; }),
target_list_.end());
}
void Logger::Log(LogInfo log_info) {
std::unique_lock lock(log_queue_mutex_);
log_queue_.push_back(std::move(log_info));
log_queue_condition_variable_.notify_one();
}
void Logger::LogThreadRun() {
std::list<LogInfo> queue;
bool stop = false;
while (true) {
std::vector<ILogTarget*> target_list;
{
std::unique_lock lock(log_queue_mutex_);
log_queue_condition_variable_.wait(
lock, [this] { return !log_queue_.empty() || log_stop_; });
queue = std::move(log_queue_);
log_queue_ = {};
stop = log_stop_;
}
{
std::lock_guard<std::mutex> lock_guard(target_list_mutex_);
for (const auto& target : target_list_) {
target_list.push_back(target.get());
}
}
for (const auto& target : target_list) {
for (auto& log_info : queue) {
if (log_info.level == LogLevel::Debug &&
std::ranges::none_of(debug_tags_,
[&log_info](const std::string& tag) {
return log_info.tag.starts_with(tag);
})) {
continue;
}
target->Write(log_info.level, MakeLogFinalMessage(log_info));
}
queue.clear();
}
// TODO: Should still wait for queue to be cleared.
if (stop) return;
}
}
Guard MeasureTimeAndLog(std::string_view tag, std::string_view name) {
CruLogDebug(std::string(tag), "Start measure {}.", name);
auto start = std::chrono::high_resolution_clock::now();
return Guard([tag = std::string(tag), name = std::string(name), start] {
auto end = std::chrono::high_resolution_clock::now();
auto duration =
std::chrono::duration_cast<std::chrono::microseconds>(end - start);
CruLogDebug(tag, "End measure {}, time {} us.", name, duration.count());
});
}
} // namespace cru::log
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