修改红绿灯http server，使用 lambda 表达式

src/network/TrafficLightHttpServer.cpp

@@ -5,12 +5,10 @@
 #include <boost/asio/signal_set.hpp>
 #include <boost/asio/strand.hpp>
 #include <boost/asio/bind_executor.hpp>
-#include <boost/asio/placeholders.hpp>
 #include <boost/beast/core.hpp>
 #include <boost/beast/http.hpp>
 #include <boost/beast/version.hpp>
 #include <boost/bind/bind.hpp>
-#include <boost/bind/placeholders.hpp>
 #include <iostream>
 #include <vector>
 #include <memory>
@@ -110,17 +108,19 @@ namespace network {
             system_(system_ref) {}
 
         void run() {
-            net::dispatch(strand_, boost::bind(&TrafficLightSession::do_read, shared_from_this()));
+            net::dispatch(strand_, [self = shared_from_this()]() {
+                self->do_read();
+                });
         }
 
     private:
         void do_read() {
-            req_ = {};
+            req_ = {}; // 清空请求对象以便重用
             http::async_read(socket_, buffer_, req_,
                 net::bind_executor(strand_,
-                    boost::bind(&TrafficLightSession::on_read, shared_from_this(),
-                        boost::asio::placeholders::error,
-                        boost::asio::placeholders::bytes_transferred)
+                    [self = shared_from_this()](beast::error_code ec, std::size_t bytes_transferred) {
+                        self->on_read(ec, bytes_transferred);
+                    }
                 ));
         }
 
@@ -274,30 +274,30 @@ namespace network {
         void do_accept() {
             acceptor_.async_accept(
                 net::bind_executor(acceptor_.get_executor(),
-                    boost::bind(&TrafficLightListener::on_accept, shared_from_this(),
-                        boost::asio::placeholders::error,
-                        boost::placeholders::_2)
+                    [self = shared_from_this()](beast::error_code ec, tcp::socket socket) { // socket 按值传递
+                        if (ec) {
+                            if (ec == net::error::operation_aborted) {
+                                return; // 服务器停止，不再接受
+                            }
+                            Logger::error("Listener Accept Error: ", ec.message());
+                            // 对于其他错误，我们仍然尝试继续接受，除非 acceptor 关闭
+                        } else {
+                            Logger::info("Accepted connection from ", socket.remote_endpoint());
+                            std::make_shared<TrafficLightSession>(
+                                std::move(socket), // 从 lambda 的参数 socket 移动
+                                self->doc_root_,   // 访问 listener 的成员
+                                self->ioc_,        // 访问 listener 的成员
+                                self->system_      // 访问 listener 的成员
+                            )->run();
+                        }
+
+                        if (self->acceptor_.is_open()) {
+                            self->do_accept(); // 继续接受下一个连接
+                        }
+                    }
                 )
             );
         }
-
-        void on_accept(beast::error_code ec, tcp::socket&& socket) {
-            if (ec) {
-                if (ec != net::error::operation_aborted)
-                    Logger::error("Listener Accept Error: ", ec.message());
-                return;
-            } else {
-                // 移除连接数检查简化注释
-                Logger::info("Accepted connection from ", socket.remote_endpoint());
-                std::make_shared<TrafficLightSession>(
-                    std::move(socket),
-                    doc_root_,
-                    ioc_,
-                    system_
-                )->run();
-            }
-            do_accept();
-        }
     };
 
     //---------------- TrafficLightHttpServer Implementation -------------------