2 files changed, 74 insertions, 0 deletions
diff --git a/src/common/CMakeLists.txt b/src/common/CMakeLists.txt
new file mode 100644
index 00000000..afbbc139
--- /dev/null
+++ b/src/common/CMakeLists.txt
@@ -0,0 +1,13 @@
+set(CRU_BASE_INCLUDE_DIR ${CRU_INCLUDE_DIR}/cru/common)
+add_library(cru_base STATIC 
+    logger.cpp
+)
+target_sources(cru_base INTERFACE
+	${CRU_BASE_INCLUDE_DIR}/base.hpp
+	${CRU_BASE_INCLUDE_DIR}/event.hpp
+	${CRU_BASE_INCLUDE_DIR}/format.hpp
+	${CRU_BASE_INCLUDE_DIR}/logger.hpp
+	${CRU_BASE_INCLUDE_DIR}/pre_config.hpp
+	${CRU_BASE_INCLUDE_DIR}/self_resolvable.hpp
+)
+target_include_directories(cru_base PUBLIC ${CRU_INCLUDE_DIR})
diff --git a/src/common/logger.cpp b/src/common/logger.cpp
new file mode 100644
index 00000000..11446f24
--- /dev/null
+++ b/src/common/logger.cpp
@@ -0,0 +1,61 @@
+#include "cru/common/logger.hpp"
+
+#include "cru/common/format.hpp"
+
+#include <cstdlib>
+#include <ctime>
+#include <memory>
+#include <string_view>
+
+namespace cru::log {
+namespace {
+Logger *CreateLogger() {
+  const auto logger = new Logger();
+  logger->AddSource(new StdioLoggerSource());
+  return logger;
+}
+}  // namespace
+
+Logger *Logger::GetInstance() {
+  static std::unique_ptr<Logger> logger{CreateLogger()};
+  return logger.get();
+}
+
+Logger::~Logger() {
+  for (const auto i : sources_) {
+    delete i;
+  }
+}
+
+void Logger::AddSource(ILoggerSource *source) { sources_.push_back(source); }
+
+void Logger::RemoveSource(ILoggerSource *source) { sources_.remove(source); }
+
+namespace {
+std::wstring_view LogLevelToString(LogLevel level) {
+  switch (level) {
+    case LogLevel::Debug:
+      return L"DEBUG";
+    case LogLevel::Info:
+      return L"INFO";
+    case LogLevel::Warn:
+      return L"WARN";
+    case LogLevel::Error:
+      return L"ERROR";
+    default:
+      std::abort();
+  }
+}
+}  // namespace
+
+void Logger::Log(LogLevel level, const std::wstring_view &s) {
+  for (const auto source : sources_) {
+    auto now = std::time(nullptr);
+    wchar_t buffer[50];
+    std::wcsftime(buffer, 50, L"%c", std::localtime(&now));
+
+    source->Write(level, util::Format(L"[{}] {}: {}\n", buffer,
+                                      LogLevelToString(level), s));
+  }
+}
+}  // namespace cru::log