Have Server take list of listen fds and add createLocalConnection

src/server.hpp

@@ -43,10 +43,15 @@ public:
    *
    * @param config Server configuration (threads, ports, limits, etc.)
    * @param handler Protocol handler for processing connection data
+   * @param listen_fds Vector of file descriptors to accept connections on.
+   *                   Server takes ownership and will close them on
+   * destruction. Server will set these to non-blocking mode for safe epoll
+   * usage. Empty vector means no listening sockets.
    * @return shared_ptr to the newly created Server
    */
   static std::shared_ptr<Server> create(const weaseldb::Config &config,
-                                        ConnectionHandler &handler);
+                                        ConnectionHandler &handler,
+                                        const std::vector<int> &listen_fds);
 
   /**
    * Destructor ensures proper cleanup of all resources.
@@ -75,6 +80,20 @@ public:
    */
   void shutdown();
 
+  /**
+   * Creates a local connection using socketpair() for testing or local IPC.
+   *
+   * Creates a socketpair, registers one end as a Connection in the server,
+   * and returns the other end to the caller for communication.
+   *
+   * The caller takes ownership of the returned file descriptor and must close
+   * it.
+   *
+   * @return File descriptor for the client end of the socketpair, or -1 on
+   * error
+   */
+  int createLocalConnection();
+
   /**
    * Release a connection back to its server for continued processing.
    *
@@ -95,8 +114,13 @@ private:
    *
    * @param config Server configuration (threads, ports, limits, etc.)
    * @param handler Protocol handler for processing connection data
+   * @param listen_fds Vector of file descriptors to accept connections on.
+   *                   Server takes ownership and will close them on
+   * destruction. Server will set these to non-blocking mode for safe epoll
+   * usage.
    */
-  explicit Server(const weaseldb::Config &config, ConnectionHandler &handler);
+  explicit Server(const weaseldb::Config &config, ConnectionHandler &handler,
+                  const std::vector<int> &listen_fds);
 
   const weaseldb::Config &config_;
   ConnectionHandler &handler_;
@@ -116,12 +140,12 @@ private:
 
   // Multiple epoll file descriptors to reduce contention
   std::vector<int> epoll_fds_;
-  int listen_sockfd_ = -1;
+  std::vector<int>
+      listen_fds_; // FDs to accept connections on (Server owns these)
 
   // Private helper methods
   void setup_shutdown_pipe();
   void setup_signal_handling();
-  int create_listen_socket();
   void create_epoll_instances();
   void start_io_threads(std::vector<std::thread> &threads);