[easylog]some improvement

[qicosmos]

Why

appender belong to logger is more reasonable.

What is changing

Example

[github-actions]

for detail, goto summary download Artifacts base-ylt-cov-report(base commit coverage report) and ylt-cov-report(current pull request coverage report)

[poor-circle]

@qicosmos 检测出TSAN错误。

[poor-circle]

@qicosmos
这里面的weak_ptr只延长了timer的生命周期，没有延迟this的生命周期。我感觉应该把session_manager做成shared_ptr然后继承enable_shared_from_this，最后在回调里面捕获session_manager的weak_ptr

  void start_check_session_timer() {
    std::lock_guard lock(timer_mtx_);
    std::weak_ptr<asio::steady_timer> timer = check_session_timer_;
    check_session_timer_->expires_after(check_session_duration_);
    check_session_timer_->async_wait([this, timer](auto ec) {
      auto ptr = timer.lock();
      if (ptr == nullptr) {
        return;
      }

      if (ec || stop_timer_) {
        return;
      }

      remove_expire_session();
      start_check_session_timer();
    });
  }