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#include "cru/base/log/Logger.h"
#include "cru/base/StringUtil.h"
#include "cru/base/log/StdioLogTarget.h"
#include <algorithm>
#include <condition_variable>
#include <cstdlib>
#include <ctime>
#include <format>
#include <memory>
#include <mutex>
#ifdef CRU_PLATFORM_WINDOWS
#include "cru/base/platform/win/DebugLogTarget.h"
#endif
namespace cru::log {
Logger *Logger::GetInstance() {
static Logger logger;
logger.AddLogTarget(std::make_unique<StdioLogTarget>());
#ifdef CRU_PLATFORM_WINDOWS
logger.AddLogTarget(std::make_unique<platform::win::WinDebugLogTarget>());
#endif
return &logger;
}
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());
}
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("[{}] {} {}: {}\n", GetLogTime(),
LogLevelToString(log_info.level), log_info.tag,
log_info.message);
}
} // namespace
Logger::Logger() : log_stop_(false), log_thread_(&Logger::LogThreadRun, this) {
LoadDebugTagFromEnv();
}
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::LoadDebugTagFromEnv(const char *env_var, std::string sep) {
auto env = std::getenv(env_var);
if (env != nullptr) {
for (auto tag : Split(std::string(env), sep)) {
AddDebugTag(std::move(tag));
}
}
}
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_);
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;
}
}
LoggerCppStream::LoggerCppStream(Logger *logger, LogLevel level,
std::string tag)
: logger_(logger), level_(level), tag_(std::move(tag)) {}
LoggerCppStream LoggerCppStream::WithLevel(LogLevel level) const {
return LoggerCppStream(this->logger_, level, this->tag_);
}
LoggerCppStream LoggerCppStream::WithTag(std::string tag) const {
return LoggerCppStream(this->logger_, this->level_, std::move(tag));
}
void LoggerCppStream::Consume(std::string_view str) {
this->logger_->Log(this->level_, this->tag_, std::string(str));
}
} // namespace cru::log
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