From de5c600092d612f34defd0e9d441fa7706170a42 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=D0=90=D0=BD=D1=82=D0=BE=D0=BD?= <a.sysoev@b2b-center.ru>
Date: Thu, 28 Mar 2024 18:26:21 +0300
Subject: [PATCH] add logger

---
 CMakeLists.txt |  4 +++-
 main.cpp       |  5 +++++
 src/Logger.cpp | 20 +++++++++++++++++
 src/Logger.h   | 59 ++++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 87 insertions(+), 1 deletion(-)
 create mode 100644 src/Logger.cpp
 create mode 100644 src/Logger.h

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 12b935f..9c6f5fa 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -37,6 +37,8 @@ add_executable(hello_async
   src/handlers/GetMapByIdHandler.h
   src/handlers/GetStaticAssetHandler.cpp
   src/handlers/GetStaticAssetHandler.h
-  src/routes.h)
+  src/routes.h
+  src/Logger.h
+  src/Logger.cpp)
 target_include_directories(hello_async PUBLIC ${Boost_INCLUDE_DIR})
 target_link_libraries(hello_async PRIVATE Threads::Threads Boost::filesystem Boost::json)
diff --git a/main.cpp b/main.cpp
index d90bb03..ae6ebc3 100644
--- a/main.cpp
+++ b/main.cpp
@@ -8,8 +8,10 @@
 #include <thread>
 #include <vector>
 #include <fstream>
+#include <iostream>
 
 #include "src/http_server.h"
+#include "src/Logger.h"
 #include "src/routes.h"
 #include "src/handlers/GetMapsHandler.h"
 #include "src/handlers/GetMapByIdHandler.h"
@@ -90,6 +92,9 @@ void RunWorkers(unsigned n, const Fn& fn)
 
 int main()
 {
+  Logger::GetInstance().SetOutStream(cout);
+  Logger::GetInstance().Log("Qwerty"s, 2, 3, 14);
+
   const unsigned num_threads = std::thread::hardware_concurrency();
 
   net::io_context ioc(num_threads);
diff --git a/src/Logger.cpp b/src/Logger.cpp
new file mode 100644
index 0000000..e94001f
--- /dev/null
+++ b/src/Logger.cpp
@@ -0,0 +1,20 @@
+#include <chrono>
+#include <iomanip>
+#include <ctime>
+
+#include "Logger.h"
+
+namespace http_server
+{
+Logger& Logger::GetInstance()
+{
+  static Logger s_Instance;
+
+  return s_Instance;
+}
+
+void Logger::SetOutStream(ostream& stream)
+{
+  stream_ptr_ = &stream;
+}
+}
diff --git a/src/Logger.h b/src/Logger.h
new file mode 100644
index 0000000..f3f5479
--- /dev/null
+++ b/src/Logger.h
@@ -0,0 +1,59 @@
+#pragma once
+#include "sdk.h"
+// boost.beast будет использовать std::string_view вместо boost::string_view
+#define BOOST_BEAST_USE_STD_STRING_VIEW
+
+#include <mutex>
+
+#include "session.h"
+
+namespace http_server
+{
+using namespace std;
+
+class Logger
+{
+  mutex mtx_;
+  ostream* stream_ptr_;
+
+  Logger() = default;
+
+ public:
+  static Logger& GetInstance();
+
+  void SetOutStream(ostream& stream);
+
+  auto GetTimeStamp()
+  {
+    const auto now = std::chrono::system_clock::now();
+    const auto t_c = std::chrono::system_clock::to_time_t(now);
+
+    return std::put_time(std::localtime(&t_c), "%F %T");
+  }
+
+  template<class First, class... Args>
+  void Log(First fst, Args... args)
+  {
+    lock_guard guard(mtx_);
+
+    *stream_ptr_ << GetTimeStamp() << ": "s;
+
+    LogImpl(fst, args...);
+  }
+
+ private:
+  template<class First, class... Args>
+  void LogImpl(First fst, Args... args)
+  {
+    *stream_ptr_ << fst;
+
+    LogImpl(args...);
+  }
+
+  template<class First>
+  void LogImpl(First fst)
+  {
+    *stream_ptr_ << fst;
+  }
+};
+}  // namespace http_server
\ No newline at end of file