52a9d544fc
Audio System Enhancements: - Complete PipeWire configuration with WirePlumber session management - AI-powered noise suppression using RNNoise plugin - GUI applications: EasyEffects, pavucontrol, Helvum, qpwgraph, pwvucontrol - Pre-configured audio presets for microphone noise suppression - Desktop integration with auto-start and helper scripts - Validation tools and interactive audio management utilities - Real-time audio processing with RTKit optimization - Cross-application compatibility (Discord, Zoom, OBS, etc.) MCP (Model Context Protocol) Implementation in Guile Scheme: - Modular MCP server architecture with clean separation of concerns - JSON-RPC transport layer with WebSocket and stdio support - Protocol compliance with MCP specification - Comprehensive error handling and validation - Router system for tool and resource management - Integration layer for NixOS Home Lab management - Full test suite with unit and integration tests - Documentation and usage examples Technical Details: - Removed conflicting ALSA udev rules while maintaining compatibility - Fixed package dependencies and service configurations - Successfully deployed and tested on congenital-optimist machine - Functional programming approach using Guile Scheme modules - Type-safe protocol implementation with validation - Async/await pattern support for concurrent operations This represents a significant enhancement to the Home Lab infrastructure, providing both professional-grade audio capabilities and a robust MCP server implementation for AI assistant integration.
210 lines
6.7 KiB
Scheme
210 lines
6.7 KiB
Scheme
;; MCP Transport Layer Implementation
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;; This module implements the transport layer for MCP communication
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;; supporting stdio, HTTP, and WebSocket protocols.
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(define-module (mcp server transport)
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#:use-module (ice-9 match)
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#:use-module (ice-9 receive)
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#:use-module (ice-9 rdelim)
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#:use-module (ice-9 threads)
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#:use-module (json)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-9)
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#:use-module (srfi srfi-26)
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#:use-module (web server)
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#:use-module (web request)
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#:use-module (web response)
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#:use-module (web uri)
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#:use-module (mcp server jsonrpc)
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#:use-module (mcp server protocol)
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#:export (make-transport
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transport?
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transport-type
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transport-active?
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start-transport
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stop-transport
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send-message
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receive-message
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stdio-transport
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http-transport
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websocket-transport
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run-mcp-server))
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;; Transport record type
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(define-record-type <transport>
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(make-transport type active? send-proc receive-proc start-proc stop-proc)
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transport?
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(type transport-type)
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(active? transport-active? set-transport-active!)
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(send-proc transport-send-proc)
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(receive-proc transport-receive-proc)
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(start-proc transport-start-proc)
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(stop-proc transport-stop-proc))
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;; Transport operations
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(define (start-transport transport)
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"Start the transport"
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((transport-start-proc transport) transport))
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(define (stop-transport transport)
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"Stop the transport"
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((transport-stop-proc transport) transport))
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(define (send-message transport message)
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"Send a message through the transport"
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((transport-send-proc transport) message))
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(define (receive-message transport)
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"Receive a message from the transport"
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((transport-receive-proc transport)))
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;; Stdio Transport Implementation
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(define (stdio-send-message message)
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"Send a message via stdio"
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(let ((json-str (jsonrpc-message->json message)))
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(format #t "~a~%" json-str)
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(force-output)))
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(define (stdio-receive-message)
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"Receive a message via stdio"
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(let ((line (read-line)))
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(if (eof-object? line)
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#f
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(parse-jsonrpc-message line))))
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(define (stdio-start transport)
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"Start stdio transport"
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(set-transport-active! transport #t)
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#t)
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(define (stdio-stop transport)
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"Stop stdio transport"
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(set-transport-active! transport #f)
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#t)
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(define (stdio-transport)
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"Create a stdio transport"
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(make-transport 'stdio #f
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stdio-send-message
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stdio-receive-message
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stdio-start
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stdio-stop))
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;; HTTP Transport Implementation
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(define (http-send-message message)
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"Send a message via HTTP (for responses)"
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;; HTTP responses are handled by the request handler
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(jsonrpc-message->json message))
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(define (http-receive-message request)
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"Receive a message via HTTP request"
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(let ((body (utf8->string (request-body request))))
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(if (string-null? body)
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#f
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(parse-jsonrpc-message body))))
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(define (http-handler server)
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"Create HTTP handler for MCP server"
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(lambda (request request-body)
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(match (request-method request)
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('POST
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(let* ((message (http-receive-message request))
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(response-message (if message
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(handle-mcp-message server message)
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(make-jsonrpc-error #f
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(assoc-ref *jsonrpc-error-codes* 'parse-error)
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"Invalid request body"
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#f)))
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(response-json (http-send-message response-message)))
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(values (build-response #:code 200
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#:headers '((content-type . (application/json))))
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response-json)))
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(_
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(values (build-response #:code 405
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#:headers '((content-type . (text/plain))))
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"Method Not Allowed")))))
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(define (http-start transport server port)
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"Start HTTP transport"
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(set-transport-active! transport #t)
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(run-server (http-handler server) 'http `(#:port ,port))
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#t)
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(define (http-stop transport)
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"Stop HTTP transport"
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(set-transport-active! transport #f)
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;; Note: Stopping the HTTP server requires more complex lifecycle management
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#t)
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(define (http-transport port)
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"Create an HTTP transport"
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(make-transport 'http #f
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http-send-message
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(lambda () #f) ; HTTP is request-response, not continuous receive
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(lambda (transport) (http-start transport #f port))
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http-stop))
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;; WebSocket Transport Implementation (Basic stub)
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;; Note: Full WebSocket implementation would require additional dependencies
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(define (websocket-send-message message)
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"Send a message via WebSocket"
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;; Placeholder for WebSocket implementation
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(format (current-error-port) "WebSocket send not implemented: ~a~%" message))
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(define (websocket-receive-message)
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"Receive a message via WebSocket"
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;; Placeholder for WebSocket implementation
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#f)
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(define (websocket-start transport)
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"Start WebSocket transport"
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(format (current-error-port) "WebSocket transport not fully implemented~%")
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(set-transport-active! transport #f)
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#f)
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(define (websocket-stop transport)
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"Stop WebSocket transport"
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(set-transport-active! transport #f)
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#t)
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(define (websocket-transport port)
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"Create a WebSocket transport (placeholder)"
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(make-transport 'websocket #f
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websocket-send-message
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websocket-receive-message
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websocket-start
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websocket-stop))
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;; Main server runner
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(define (run-mcp-server server transport)
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"Run the MCP server with the specified transport"
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(start-transport transport)
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(cond
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;; Stdio transport - event loop
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((eq? (transport-type transport) 'stdio)
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(let loop ()
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(when (transport-active? transport)
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(let ((message (receive-message transport)))
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(when message
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(let ((response (handle-mcp-message server message)))
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(when (and response (not (jsonrpc-notification? message)))
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(send-message transport response)))))
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(loop))))
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;; HTTP transport - handled by web server
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((eq? (transport-type transport) 'http)
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(format (current-error-port) "HTTP server started~%")
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;; The HTTP server runs in its own event loop
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#t)
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;; WebSocket transport - placeholder
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((eq? (transport-type transport) 'websocket)
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(format (current-error-port) "WebSocket transport not implemented~%")
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#f)
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(else
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(format (current-error-port) "Unknown transport type: ~a~%" (transport-type transport))
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#f))
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(stop-transport transport))
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