1 files changed, 65 insertions, 0 deletions
diff --git a/src/common/Logger.cpp b/src/common/Logger.cpp
new file mode 100644
index 00000000..ed9f9e64
--- /dev/null
+++ b/src/common/Logger.cpp
@@ -0,0 +1,65 @@
+#include "cru/common/Logger.hpp"
+
+#include <array>
+#include <cstdlib>
+#include <ctime>
+#include <memory>
+#include <string_view>
+
+namespace cru::log {
+namespace {
+Logger *CreateLogger() {
+  const auto logger = new Logger();
+  logger->AddSource(std::make_unique<StdioLogSource>());
+  return logger;
+}
+}  // namespace
+
+Logger *Logger::GetInstance() {
+  static std::unique_ptr<Logger> logger{CreateLogger()};
+  return logger.get();
+}
+
+void Logger::AddSource(std::unique_ptr<ILogSource> source) {
+  sources_.push_back(std::move(source));
+}
+
+void Logger::RemoveSource(ILogSource *source) {
+  sources_.remove_if([source](const std::unique_ptr<ILogSource> &s) {
+    return s.get() == source;
+  });
+}
+
+namespace {
+std::string_view 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::abort();
+  }
+}
+}  // namespace
+
+void Logger::Log(LogLevel level, const std::string_view &s) {
+#ifndef CRU_DEBUG
+  if (level == LogLevel::Debug) {
+    return;
+  }
+#endif
+  for (const auto &source : sources_) {
+    auto now = std::time(nullptr);
+    std::array<char, 50> buffer;
+    std::strftime(buffer.data(), 50, "%c", std::localtime(&now));
+
+    source->Write(level, fmt::format("[{}] {}: {}\n", buffer.data(),
+                                     LogLevelToString(level), s));
+  }
+}
+}  // namespace cru::log