tcp/udp 추가, todo:iocp openssl 지원하도록 업데이트하기

impl/utils/generate_id.cpp

@@ -0,0 +1,32 @@
+#include "utils/snowflake.h"
+
+#include <thread>
+
+namespace utils {
+
+static struct EpochInitializer {
+  EpochInitializer() { EPOCH = std::chrono::system_clock::now(); }
+  std::chrono::system_clock::time_point EPOCH;
+} epochInitializer;
+
+Snowflake GenerateID() {
+  static std::mutex snowflakeGenerateMutex_;
+
+  std::lock_guard<std::mutex> lock(snowflakeGenerateMutex_);
+
+  std::size_t tid =
+      std::hash<std::thread::id>{}(std::this_thread::get_id());
+
+  thread_local static int sequence = 0;
+  Snowflake id = {};
+
+  auto timestamp = std::chrono::duration_cast<std::chrono::milliseconds>(
+      std::chrono::system_clock::now() - epochInitializer.EPOCH);
+  id.timestamp = timestamp.count();
+  id.instance = tid;
+  id.sequence = sequence++;
+
+  return id;
+}
+
+};  // namespace Chattr