emacs-mcp-server/mcp-server-transport-tcp.el at main · rhblind/emacs-mcp-server · GitHub

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;;; mcp-server-transport-tcp.el --- TCP Socket Transport -*- lexical-binding: t; -*-

;; Copyright (C) 2025

;; This file is NOT part of GNU Emacs.

;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.

;;; Commentary:

;; This module provides TCP socket transport for the MCP server.
;; TCP transport enables network connectivity for remote MCP clients.
;; The implementation will follow the same pattern as Unix socket transport.
;;
;; Features planned for implementation:
;; - Full TCP transport functionality
;; - TLS/SSL support for secure connections
;; - Authentication mechanisms
;; - Configuration for bind address and port ranges

;;; Code:

(require 'mcp-server-transport)

;;; Variables

(defvar mcp-server-transport-tcp--server-process nil
  "The TCP socket server process.")

(defvar mcp-server-transport-tcp--port nil
  "Port number for the TCP server.")

(defvar mcp-server-transport-tcp--host "localhost"
  "Host address for the TCP server.")

(defvar mcp-server-transport-tcp--running nil
  "Whether the TCP transport is running.")

;;; Implementation

(defun mcp-server-transport-tcp--start (message-handler &optional host port)
  "Start TCP socket server with MESSAGE-HANDLER at HOST:PORT.
TCP transport functionality is planned for future implementation."
  (error "TCP transport is planned for future implementation. Use Unix socket transport instead."))

(defun mcp-server-transport-tcp--stop ()
  "Stop the TCP socket server.
TCP transport functionality is planned for future implementation."
  (error "TCP transport is planned for future implementation"))

(defun mcp-server-transport-tcp--send (client-id message)
  "Send MESSAGE to CLIENT-ID via TCP.
TCP transport functionality is planned for future implementation."
  (error "TCP transport is planned for future implementation"))

(defun mcp-server-transport-tcp--status ()
  "Get status of TCP transport.
TCP transport functionality is planned for future implementation."
  `((running . ,mcp-server-transport-tcp--running)
    (host . ,mcp-server-transport-tcp--host)
    (port . ,mcp-server-transport-tcp--port)
    (implemented . nil)
    (note . "TCP transport planned for future implementation - use Unix socket transport")))

(defun mcp-server-transport-tcp--list-clients ()
  "List all connected TCP clients.
TCP transport functionality is planned for future implementation."
  '())

(defun mcp-server-transport-tcp--disconnect-client (client-id)
  "Disconnect TCP CLIENT-ID.
TCP transport functionality is planned for future implementation."
  (error "TCP transport is planned for future implementation"))

;;; Transport Registration

(defun mcp-server-transport-tcp-register ()
  "Register the TCP socket transport."
  (mcp-server-transport-register
   "tcp"
   (make-mcp-server-transport
    :name "TCP Socket"
    :start-fn #'mcp-server-transport-tcp--start
    :stop-fn #'mcp-server-transport-tcp--stop
    :send-fn #'mcp-server-transport-tcp--send
    :status-fn #'mcp-server-transport-tcp--status
    :list-clients-fn #'mcp-server-transport-tcp--list-clients
    :disconnect-client-fn #'mcp-server-transport-tcp--disconnect-client)))

;; Register on load
(mcp-server-transport-tcp-register)

;;; Future Implementation Notes

;; When implementing TCP transport, consider:
;;
;; 1. Security:
;;    - TLS/SSL support for encrypted connections
;;    - Authentication mechanisms (tokens, certificates)
;;    - Rate limiting and connection limits
;;    - IP-based access control
;;
;; 2. Configuration:
;;    - Configurable bind address (0.0.0.0, 127.0.0.1, specific IP)
;;    - Port range specification or automatic port selection
;;    - Connection timeout settings
;;    - Buffer size configurations
;;
;; 3. Network Considerations:
;;    - Proper handling of network errors and timeouts
;;    - Graceful degradation on network issues
;;    - Support for IPv6
;;    - NAT/firewall considerations
;;
;; 4. Client Management:
;;    - Per-client authentication state
;;    - Connection tracking and logging
;;    - Bandwidth monitoring
;;    - Client capability negotiation
;;
;; 5. Integration:
;;    - Service discovery mechanisms (mDNS, DNS-SD)
;;    - Integration with system firewall
;;    - Log integration with system logging
;;    - Monitoring and metrics collection

(provide 'mcp-server-transport-tcp)

;;; mcp-server-transport-tcp.el ends here