924 lines
25 KiB
Go
924 lines
25 KiB
Go
package main
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import (
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"bufio"
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"encoding/json"
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"fmt"
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"io"
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"log"
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"os"
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"os/signal"
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"path/filepath"
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"strconv"
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"strings"
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"syscall"
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"time"
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"git.teamworkapps.com/shortcut/cremote/client"
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)
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// DebugLogger handles debug logging to file
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type DebugLogger struct {
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file *os.File
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logger *log.Logger
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}
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// NewDebugLogger creates a new debug logger
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func NewDebugLogger() (*DebugLogger, error) {
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logDir := "/tmp/cremote-mcp-logs"
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if err := os.MkdirAll(logDir, 0755); err != nil {
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return nil, fmt.Errorf("failed to create log directory: %w", err)
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}
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logFile := filepath.Join(logDir, fmt.Sprintf("mcp-stdio-%d.log", time.Now().Unix()))
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file, err := os.OpenFile(logFile, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0644)
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if err != nil {
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return nil, fmt.Errorf("failed to open log file: %w", err)
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}
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logger := log.New(file, "", log.LstdFlags|log.Lmicroseconds|log.Lshortfile)
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logger.Printf("=== MCP STDIO Server Debug Log Started ===")
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return &DebugLogger{
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file: file,
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logger: logger,
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}, nil
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}
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// Log writes a debug message
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func (d *DebugLogger) Log(format string, args ...interface{}) {
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if d != nil && d.logger != nil {
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d.logger.Printf(format, args...)
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}
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}
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// LogJSON logs a JSON object with a label
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func (d *DebugLogger) LogJSON(label string, obj interface{}) {
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if d != nil && d.logger != nil {
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jsonBytes, err := json.MarshalIndent(obj, "", " ")
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if err != nil {
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d.logger.Printf("%s: JSON marshal error: %v", label, err)
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} else {
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d.logger.Printf("%s:\n%s", label, string(jsonBytes))
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}
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}
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}
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// Close closes the debug logger
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func (d *DebugLogger) Close() {
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if d != nil && d.file != nil {
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d.logger.Printf("=== MCP STDIO Server Debug Log Ended ===")
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d.file.Close()
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}
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}
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var debugLogger *DebugLogger
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// MCPServer wraps the cremote client with MCP protocol
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type MCPServer struct {
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client *client.Client
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currentTab string
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tabHistory []string
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iframeMode bool
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screenshots []string
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}
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// MCPRequest represents an incoming MCP request
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type MCPRequest struct {
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JSONRPC string `json:"jsonrpc,omitempty"`
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Method string `json:"method"`
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Params map[string]interface{} `json:"params"`
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ID interface{} `json:"id"`
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}
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// MCPResponse represents an MCP response
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type MCPResponse struct {
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JSONRPC string `json:"jsonrpc,omitempty"`
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Result interface{} `json:"result,omitempty"`
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Error *MCPError `json:"error,omitempty"`
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ID interface{} `json:"id"`
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}
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// MCPError represents an MCP error
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type MCPError struct {
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Code int `json:"code"`
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Message string `json:"message"`
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}
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// ToolResult represents the result of a tool execution
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type ToolResult struct {
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Success bool `json:"success"`
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Data interface{} `json:"data,omitempty"`
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Screenshot string `json:"screenshot,omitempty"`
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CurrentTab string `json:"current_tab,omitempty"`
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TabHistory []string `json:"tab_history,omitempty"`
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IframeMode bool `json:"iframe_mode"`
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Error string `json:"error,omitempty"`
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Metadata map[string]string `json:"metadata,omitempty"`
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}
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// NewMCPServer creates a new MCP server instance
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func NewMCPServer(host string, port int) *MCPServer {
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c := client.NewClient(host, port)
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return &MCPServer{
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client: c,
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tabHistory: make([]string, 0),
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screenshots: make([]string, 0),
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}
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}
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// HandleRequest processes an MCP request and returns a response
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func (s *MCPServer) HandleRequest(req MCPRequest) MCPResponse {
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debugLogger.Log("HandleRequest called with method: %s, ID: %v", req.Method, req.ID)
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debugLogger.LogJSON("Incoming Request", req)
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var resp MCPResponse
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switch req.Method {
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case "initialize":
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debugLogger.Log("Handling initialize request")
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resp = s.handleInitialize(req)
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case "tools/list":
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debugLogger.Log("Handling tools/list request")
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resp = s.handleToolsList(req)
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case "tools/call":
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debugLogger.Log("Handling tools/call request")
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resp = s.handleToolCall(req)
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default:
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debugLogger.Log("Unknown method: %s", req.Method)
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resp = MCPResponse{
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Error: &MCPError{
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Code: -32601,
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Message: fmt.Sprintf("Method not found: %s", req.Method),
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},
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ID: req.ID,
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}
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}
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debugLogger.LogJSON("Response", resp)
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debugLogger.Log("HandleRequest completed for method: %s", req.Method)
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return resp
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}
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// handleInitialize handles the MCP initialize request
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func (s *MCPServer) handleInitialize(req MCPRequest) MCPResponse {
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debugLogger.Log("handleInitialize: Processing initialize request")
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debugLogger.LogJSON("Initialize request params", req.Params)
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result := map[string]interface{}{
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"protocolVersion": "2024-11-05",
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"capabilities": map[string]interface{}{
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"tools": map[string]interface{}{
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"listChanged": true,
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},
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},
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"serverInfo": map[string]interface{}{
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"name": "cremote-mcp",
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"version": "1.0.0",
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},
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}
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debugLogger.LogJSON("Initialize response result", result)
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return MCPResponse{
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Result: result,
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ID: req.ID,
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}
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}
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// handleToolsList returns the list of available tools
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func (s *MCPServer) handleToolsList(req MCPRequest) MCPResponse {
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tools := []map[string]interface{}{
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{
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"name": "web_navigate",
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"description": "Navigate to a URL and optionally take a screenshot",
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"inputSchema": map[string]interface{}{
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"type": "object",
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"properties": map[string]interface{}{
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"url": map[string]interface{}{
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"type": "string",
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"description": "URL to navigate to",
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},
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"tab": map[string]interface{}{
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"type": "string",
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"description": "Tab ID (optional, uses current tab)",
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},
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"screenshot": map[string]interface{}{
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"type": "boolean",
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"description": "Take screenshot after navigation",
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},
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"timeout": map[string]interface{}{
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"type": "integer",
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"description": "Timeout in seconds",
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"default": 5,
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},
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},
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"required": []string{"url"},
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},
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},
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{
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"name": "web_interact",
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"description": "Interact with web elements (click, fill, submit)",
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"inputSchema": map[string]interface{}{
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"type": "object",
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"properties": map[string]interface{}{
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"action": map[string]interface{}{
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"type": "string",
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"enum": []string{"click", "fill", "submit", "upload"},
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},
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"selector": map[string]interface{}{
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"type": "string",
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"description": "CSS selector for the element",
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},
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"value": map[string]interface{}{
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"type": "string",
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"description": "Value to fill (for fill/upload actions)",
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},
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"tab": map[string]interface{}{
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"type": "string",
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"description": "Tab ID (optional)",
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},
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"timeout": map[string]interface{}{
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"type": "integer",
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"description": "Timeout in seconds",
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"default": 5,
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},
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},
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"required": []string{"action", "selector"},
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},
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},
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{
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"name": "web_extract",
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"description": "Extract data from the page (source, element HTML, or execute JavaScript)",
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"inputSchema": map[string]interface{}{
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"type": "object",
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"properties": map[string]interface{}{
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"type": map[string]interface{}{
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"type": "string",
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"enum": []string{"source", "element", "javascript"},
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},
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"selector": map[string]interface{}{
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"type": "string",
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"description": "CSS selector (for element type)",
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},
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"code": map[string]interface{}{
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"type": "string",
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"description": "JavaScript code (for javascript type)",
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},
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"tab": map[string]interface{}{
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"type": "string",
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"description": "Tab ID (optional)",
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},
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"timeout": map[string]interface{}{
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"type": "integer",
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"description": "Timeout in seconds",
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"default": 5,
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},
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},
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"required": []string{"type"},
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},
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},
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{
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"name": "web_screenshot",
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"description": "Take a screenshot of the current page",
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"inputSchema": map[string]interface{}{
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"type": "object",
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"properties": map[string]interface{}{
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"output": map[string]interface{}{
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"type": "string",
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"description": "Output file path",
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},
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"full_page": map[string]interface{}{
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"type": "boolean",
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"description": "Capture full page",
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"default": false,
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},
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"tab": map[string]interface{}{
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"type": "string",
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"description": "Tab ID (optional)",
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},
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"timeout": map[string]interface{}{
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"type": "integer",
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"description": "Timeout in seconds",
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"default": 5,
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},
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},
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"required": []string{"output"},
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},
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},
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{
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"name": "web_manage_tabs",
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"description": "Manage browser tabs (open, close, list, switch)",
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"inputSchema": map[string]interface{}{
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"type": "object",
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"properties": map[string]interface{}{
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"action": map[string]interface{}{
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"type": "string",
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"enum": []string{"open", "close", "list", "switch"},
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},
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"tab": map[string]interface{}{
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"type": "string",
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"description": "Tab ID (for close/switch actions)",
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},
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"timeout": map[string]interface{}{
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"type": "integer",
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"description": "Timeout in seconds",
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"default": 5,
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},
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},
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"required": []string{"action"},
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},
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},
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{
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"name": "web_iframe",
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"description": "Switch iframe context for subsequent operations",
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"inputSchema": map[string]interface{}{
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"type": "object",
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"properties": map[string]interface{}{
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"action": map[string]interface{}{
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"type": "string",
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"enum": []string{"enter", "exit"},
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},
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"selector": map[string]interface{}{
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"type": "string",
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"description": "Iframe CSS selector (for enter action)",
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},
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"tab": map[string]interface{}{
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"type": "string",
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"description": "Tab ID (optional)",
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},
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},
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"required": []string{"action"},
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},
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},
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}
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return MCPResponse{
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Result: map[string]interface{}{
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"tools": tools,
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},
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ID: req.ID,
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}
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}
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// handleToolCall executes a tool and returns the result
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func (s *MCPServer) handleToolCall(req MCPRequest) MCPResponse {
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debugLogger.Log("handleToolCall: Processing tool call request")
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debugLogger.LogJSON("Tool call request params", req.Params)
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params := req.Params
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toolName, ok := params["name"].(string)
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if !ok || toolName == "" {
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debugLogger.Log("handleToolCall: Tool name missing or invalid")
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return MCPResponse{
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Error: &MCPError{Code: -32602, Message: "Missing tool name"},
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ID: req.ID,
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}
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}
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debugLogger.Log("handleToolCall: Tool name extracted: %s", toolName)
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arguments, _ := params["arguments"].(map[string]interface{})
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if arguments == nil {
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debugLogger.Log("handleToolCall: No arguments provided, using empty map")
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arguments = make(map[string]interface{})
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} else {
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debugLogger.LogJSON("Tool arguments", arguments)
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}
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var result ToolResult
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var err error
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debugLogger.Log("handleToolCall: Dispatching to tool handler: %s", toolName)
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switch toolName {
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case "web_navigate":
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result, err = s.handleNavigate(arguments)
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case "web_interact":
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result, err = s.handleInteract(arguments)
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case "web_extract":
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result, err = s.handleExtract(arguments)
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case "web_screenshot":
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result, err = s.handleScreenshot(arguments)
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case "web_manage_tabs":
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result, err = s.handleManageTabs(arguments)
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case "web_iframe":
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result, err = s.handleIframe(arguments)
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default:
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debugLogger.Log("handleToolCall: Unknown tool: %s", toolName)
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return MCPResponse{
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Error: &MCPError{Code: -32601, Message: fmt.Sprintf("Unknown tool: %s", toolName)},
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ID: req.ID,
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}
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}
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debugLogger.LogJSON("Tool execution result", result)
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if err != nil {
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debugLogger.Log("handleToolCall: Tool execution error: %v", err)
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return MCPResponse{
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Error: &MCPError{Code: -32603, Message: err.Error()},
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ID: req.ID,
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}
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}
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// Always include current state in response
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result.CurrentTab = s.currentTab
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result.TabHistory = s.tabHistory
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result.IframeMode = s.iframeMode
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response := MCPResponse{Result: result, ID: req.ID}
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debugLogger.LogJSON("Final tool call response", response)
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debugLogger.Log("handleToolCall: Completed successfully for tool: %s", toolName)
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return response
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}
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// Helper functions for parameter extraction
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func getStringParam(params map[string]interface{}, key, defaultValue string) string {
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if val, ok := params[key].(string); ok {
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return val
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}
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return defaultValue
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}
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func getIntParam(params map[string]interface{}, key string, defaultValue int) int {
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if val, ok := params[key].(float64); ok {
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return int(val)
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}
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return defaultValue
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}
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func getBoolParam(params map[string]interface{}, key string, defaultValue bool) bool {
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if val, ok := params[key].(bool); ok {
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return val
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}
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return defaultValue
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}
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// resolveTabID returns the tab ID to use, defaulting to current tab
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func (s *MCPServer) resolveTabID(tabID string) string {
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if tabID != "" {
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return tabID
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}
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return s.currentTab
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}
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// handleNavigate handles web navigation
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func (s *MCPServer) handleNavigate(params map[string]interface{}) (ToolResult, error) {
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url := getStringParam(params, "url", "")
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if url == "" {
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return ToolResult{}, fmt.Errorf("url parameter is required")
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}
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tab := getStringParam(params, "tab", "")
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screenshot := getBoolParam(params, "screenshot", false)
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timeout := getIntParam(params, "timeout", 5)
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// If no tab specified and no current tab, open a new one
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if tab == "" && s.currentTab == "" {
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newTab, err := s.client.OpenTab(timeout)
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if err != nil {
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return ToolResult{}, fmt.Errorf("failed to open new tab: %w", err)
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}
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s.currentTab = newTab
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s.tabHistory = append(s.tabHistory, newTab)
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tab = newTab
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} else if tab == "" {
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tab = s.currentTab
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} else {
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// Update current tab if specified
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s.currentTab = tab
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// Move to end of history if it exists, otherwise add it
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s.removeTabFromHistory(tab)
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s.tabHistory = append(s.tabHistory, tab)
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}
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// Navigate to URL
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err := s.client.LoadURL(tab, url, timeout)
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if err != nil {
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return ToolResult{}, fmt.Errorf("failed to navigate to %s: %w", url, err)
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}
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result := ToolResult{
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Success: true,
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Data: map[string]string{
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"url": url,
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"tab": tab,
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},
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}
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// Take screenshot if requested
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if screenshot {
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screenshotPath := fmt.Sprintf("/tmp/navigate-%d.png", time.Now().Unix())
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err = s.client.TakeScreenshot(tab, screenshotPath, false, timeout)
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if err != nil {
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// Don't fail the whole operation for screenshot errors
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result.Metadata = map[string]string{
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"screenshot_error": err.Error(),
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}
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} else {
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result.Screenshot = screenshotPath
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s.screenshots = append(s.screenshots, screenshotPath)
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}
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}
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return result, nil
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}
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// handleInteract handles element interactions
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func (s *MCPServer) handleInteract(params map[string]interface{}) (ToolResult, error) {
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action := getStringParam(params, "action", "")
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selector := getStringParam(params, "selector", "")
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value := getStringParam(params, "value", "")
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tab := s.resolveTabID(getStringParam(params, "tab", ""))
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timeout := getIntParam(params, "timeout", 5)
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if action == "" {
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return ToolResult{}, fmt.Errorf("action parameter is required")
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}
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if selector == "" {
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return ToolResult{}, fmt.Errorf("selector parameter is required")
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}
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if tab == "" {
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return ToolResult{}, fmt.Errorf("no active tab available")
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}
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var err error
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result := ToolResult{Success: true}
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switch action {
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case "click":
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err = s.client.ClickElement(tab, selector, timeout, timeout)
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result.Data = map[string]string{"action": "clicked", "selector": selector}
|
|
|
|
case "fill":
|
|
if value == "" {
|
|
return ToolResult{}, fmt.Errorf("value parameter is required for fill action")
|
|
}
|
|
err = s.client.FillFormField(tab, selector, value, timeout, timeout)
|
|
result.Data = map[string]string{"action": "filled", "selector": selector, "value": value}
|
|
|
|
case "submit":
|
|
err = s.client.SubmitForm(tab, selector, timeout, timeout)
|
|
result.Data = map[string]string{"action": "submitted", "selector": selector}
|
|
|
|
case "upload":
|
|
if value == "" {
|
|
return ToolResult{}, fmt.Errorf("value parameter is required for upload action")
|
|
}
|
|
err = s.client.UploadFile(tab, selector, value, timeout, timeout)
|
|
result.Data = map[string]string{"action": "uploaded", "selector": selector, "file": value}
|
|
|
|
default:
|
|
return ToolResult{}, fmt.Errorf("unknown action: %s", action)
|
|
}
|
|
|
|
if err != nil {
|
|
return ToolResult{}, fmt.Errorf("failed to %s element: %w", action, err)
|
|
}
|
|
|
|
return result, nil
|
|
}
|
|
|
|
// handleExtract handles data extraction
|
|
func (s *MCPServer) handleExtract(params map[string]interface{}) (ToolResult, error) {
|
|
extractType := getStringParam(params, "type", "")
|
|
selector := getStringParam(params, "selector", "")
|
|
code := getStringParam(params, "code", "")
|
|
tab := s.resolveTabID(getStringParam(params, "tab", ""))
|
|
timeout := getIntParam(params, "timeout", 5)
|
|
|
|
if extractType == "" {
|
|
return ToolResult{}, fmt.Errorf("type parameter is required")
|
|
}
|
|
if tab == "" {
|
|
return ToolResult{}, fmt.Errorf("no active tab available")
|
|
}
|
|
|
|
var data string
|
|
var err error
|
|
|
|
switch extractType {
|
|
case "source":
|
|
data, err = s.client.GetPageSource(tab, timeout)
|
|
|
|
case "element":
|
|
if selector == "" {
|
|
return ToolResult{}, fmt.Errorf("selector parameter is required for element type")
|
|
}
|
|
data, err = s.client.GetElementHTML(tab, selector, timeout)
|
|
|
|
case "javascript":
|
|
if code == "" {
|
|
return ToolResult{}, fmt.Errorf("code parameter is required for javascript type")
|
|
}
|
|
data, err = s.client.EvalJS(tab, code, timeout)
|
|
|
|
default:
|
|
return ToolResult{}, fmt.Errorf("unknown extract type: %s", extractType)
|
|
}
|
|
|
|
if err != nil {
|
|
return ToolResult{}, fmt.Errorf("failed to extract %s: %w", extractType, err)
|
|
}
|
|
|
|
return ToolResult{
|
|
Success: true,
|
|
Data: data,
|
|
}, nil
|
|
}
|
|
|
|
// handleScreenshot handles screenshot capture
|
|
func (s *MCPServer) handleScreenshot(params map[string]interface{}) (ToolResult, error) {
|
|
output := getStringParam(params, "output", "")
|
|
if output == "" {
|
|
output = fmt.Sprintf("/tmp/screenshot-%d.png", time.Now().Unix())
|
|
}
|
|
|
|
tab := s.resolveTabID(getStringParam(params, "tab", ""))
|
|
fullPage := getBoolParam(params, "full_page", false)
|
|
timeout := getIntParam(params, "timeout", 5)
|
|
|
|
if tab == "" {
|
|
return ToolResult{}, fmt.Errorf("no active tab available")
|
|
}
|
|
|
|
err := s.client.TakeScreenshot(tab, output, fullPage, timeout)
|
|
if err != nil {
|
|
return ToolResult{}, fmt.Errorf("failed to take screenshot: %w", err)
|
|
}
|
|
|
|
s.screenshots = append(s.screenshots, output)
|
|
|
|
return ToolResult{
|
|
Success: true,
|
|
Screenshot: output,
|
|
Data: map[string]interface{}{
|
|
"output": output,
|
|
"full_page": fullPage,
|
|
"tab": tab,
|
|
},
|
|
}, nil
|
|
}
|
|
|
|
// handleManageTabs handles tab management operations
|
|
func (s *MCPServer) handleManageTabs(params map[string]interface{}) (ToolResult, error) {
|
|
action := getStringParam(params, "action", "")
|
|
tab := getStringParam(params, "tab", "")
|
|
timeout := getIntParam(params, "timeout", 5)
|
|
|
|
if action == "" {
|
|
return ToolResult{}, fmt.Errorf("action parameter is required")
|
|
}
|
|
|
|
var data interface{}
|
|
var err error
|
|
|
|
switch action {
|
|
case "open":
|
|
newTab, err := s.client.OpenTab(timeout)
|
|
if err != nil {
|
|
return ToolResult{}, fmt.Errorf("failed to open tab: %w", err)
|
|
}
|
|
s.currentTab = newTab
|
|
s.tabHistory = append(s.tabHistory, newTab)
|
|
data = map[string]string{"tab": newTab, "action": "opened"}
|
|
|
|
case "close":
|
|
targetTab := s.resolveTabID(tab)
|
|
if targetTab == "" {
|
|
return ToolResult{}, fmt.Errorf("no tab to close")
|
|
}
|
|
err = s.client.CloseTab(targetTab, timeout)
|
|
if err != nil {
|
|
return ToolResult{}, fmt.Errorf("failed to close tab: %w", err)
|
|
}
|
|
s.removeTabFromHistory(targetTab)
|
|
data = map[string]string{"tab": targetTab, "action": "closed"}
|
|
|
|
case "list":
|
|
tabs, err := s.client.ListTabs()
|
|
if err != nil {
|
|
return ToolResult{}, fmt.Errorf("failed to list tabs: %w", err)
|
|
}
|
|
data = tabs
|
|
|
|
case "switch":
|
|
if tab == "" {
|
|
return ToolResult{}, fmt.Errorf("tab parameter is required for switch action")
|
|
}
|
|
s.currentTab = tab
|
|
s.removeTabFromHistory(tab)
|
|
s.tabHistory = append(s.tabHistory, tab)
|
|
data = map[string]string{"tab": tab, "action": "switched"}
|
|
|
|
default:
|
|
return ToolResult{}, fmt.Errorf("unknown tab action: %s", action)
|
|
}
|
|
|
|
if err != nil {
|
|
return ToolResult{}, err
|
|
}
|
|
|
|
return ToolResult{
|
|
Success: true,
|
|
Data: data,
|
|
}, nil
|
|
}
|
|
|
|
// handleIframe handles iframe context switching
|
|
func (s *MCPServer) handleIframe(params map[string]interface{}) (ToolResult, error) {
|
|
action := getStringParam(params, "action", "")
|
|
selector := getStringParam(params, "selector", "")
|
|
tab := s.resolveTabID(getStringParam(params, "tab", ""))
|
|
|
|
if action == "" {
|
|
return ToolResult{}, fmt.Errorf("action parameter is required")
|
|
}
|
|
|
|
if tab == "" {
|
|
return ToolResult{}, fmt.Errorf("no active tab available")
|
|
}
|
|
|
|
var err error
|
|
var data map[string]string
|
|
|
|
switch action {
|
|
case "enter":
|
|
if selector == "" {
|
|
return ToolResult{}, fmt.Errorf("selector parameter is required for enter action")
|
|
}
|
|
err = s.client.SwitchToIframe(tab, selector, 5) // Default 5 second timeout
|
|
s.iframeMode = true
|
|
data = map[string]string{"action": "entered", "selector": selector}
|
|
|
|
case "exit":
|
|
err = s.client.SwitchToMain(tab)
|
|
s.iframeMode = false
|
|
data = map[string]string{"action": "exited"}
|
|
|
|
default:
|
|
return ToolResult{}, fmt.Errorf("unknown iframe action: %s", action)
|
|
}
|
|
|
|
if err != nil {
|
|
return ToolResult{}, fmt.Errorf("failed to %s iframe: %w", action, err)
|
|
}
|
|
|
|
return ToolResult{
|
|
Success: true,
|
|
Data: data,
|
|
}, nil
|
|
}
|
|
|
|
// removeTabFromHistory removes a tab from history and updates current tab
|
|
func (s *MCPServer) removeTabFromHistory(tabID string) {
|
|
for i, id := range s.tabHistory {
|
|
if id == tabID {
|
|
s.tabHistory = append(s.tabHistory[:i], s.tabHistory[i+1:]...)
|
|
break
|
|
}
|
|
}
|
|
if s.currentTab == tabID {
|
|
if len(s.tabHistory) > 0 {
|
|
s.currentTab = s.tabHistory[len(s.tabHistory)-1]
|
|
} else {
|
|
s.currentTab = ""
|
|
}
|
|
}
|
|
}
|
|
|
|
func main() {
|
|
// Initialize debug logger
|
|
var err error
|
|
debugLogger, err = NewDebugLogger()
|
|
if err != nil {
|
|
log.Printf("Warning: Failed to initialize debug logger: %v", err)
|
|
// Continue without debug logging
|
|
} else {
|
|
defer debugLogger.Close()
|
|
debugLogger.Log("MCP STDIO Server starting up")
|
|
}
|
|
|
|
// Set up signal handling for graceful shutdown
|
|
sigChan := make(chan os.Signal, 1)
|
|
signal.Notify(sigChan, syscall.SIGINT, syscall.SIGTERM)
|
|
|
|
host := os.Getenv("CREMOTE_HOST")
|
|
if host == "" {
|
|
host = "localhost"
|
|
}
|
|
|
|
portStr := os.Getenv("CREMOTE_PORT")
|
|
port := 8989
|
|
if portStr != "" {
|
|
if p, err := strconv.Atoi(portStr); err == nil {
|
|
port = p
|
|
}
|
|
}
|
|
|
|
debugLogger.Log("Connecting to cremote daemon at %s:%d", host, port)
|
|
log.Printf("Starting MCP stdio server, connecting to cremote daemon at %s:%d", host, port)
|
|
server := NewMCPServer(host, port)
|
|
|
|
// Create a buffered reader for better EOF handling
|
|
reader := bufio.NewReader(os.Stdin)
|
|
|
|
log.Printf("MCP stdio server ready, waiting for requests...")
|
|
|
|
// Channel to signal when to stop reading
|
|
done := make(chan bool)
|
|
|
|
// Goroutine to handle stdin reading
|
|
go func() {
|
|
defer close(done)
|
|
for {
|
|
// Read headers for Content-Length framing (use the same reader for headers and body)
|
|
contentLength := -1
|
|
for {
|
|
line, err := reader.ReadString('\n')
|
|
if err != nil {
|
|
if err == io.EOF {
|
|
log.Printf("Input stream closed, shutting down MCP server")
|
|
return
|
|
}
|
|
log.Printf("Error reading header: %v", err)
|
|
return
|
|
}
|
|
line = strings.TrimRight(line, "\r\n")
|
|
if line == "" {
|
|
break // end of headers
|
|
}
|
|
const prefix = "content-length: "
|
|
low := strings.ToLower(line)
|
|
if strings.HasPrefix(low, prefix) {
|
|
var err error
|
|
contentLength, err = strconv.Atoi(strings.TrimSpace(low[len(prefix):]))
|
|
if err != nil {
|
|
log.Printf("Invalid Content-Length: %v", err)
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
if contentLength < 0 {
|
|
log.Printf("Missing Content-Length header")
|
|
return
|
|
}
|
|
|
|
// Read body of specified length
|
|
debugLogger.Log("Reading request body of length: %d", contentLength)
|
|
body := make([]byte, contentLength)
|
|
if _, err := io.ReadFull(reader, body); err != nil {
|
|
debugLogger.Log("Error reading body: %v", err)
|
|
log.Printf("Error reading body: %v", err)
|
|
return
|
|
}
|
|
|
|
debugLogger.Log("Raw request body: %s", string(body))
|
|
|
|
var req MCPRequest
|
|
if err := json.Unmarshal(body, &req); err != nil {
|
|
debugLogger.Log("Error decoding request body: %v", err)
|
|
log.Printf("Error decoding request body: %v", err)
|
|
continue
|
|
}
|
|
|
|
debugLogger.Log("Successfully parsed request: %s (ID: %v)", req.Method, req.ID)
|
|
log.Printf("Processing request: %s (ID: %v)", req.Method, req.ID)
|
|
|
|
resp := server.HandleRequest(req)
|
|
resp.JSONRPC = "2.0"
|
|
|
|
// Write Content-Length framed response
|
|
responseBytes, err := json.Marshal(resp)
|
|
if err != nil {
|
|
debugLogger.Log("Error marshaling response: %v", err)
|
|
log.Printf("Error marshaling response: %v", err)
|
|
continue
|
|
}
|
|
|
|
debugLogger.Log("Sending response with Content-Length: %d", len(responseBytes))
|
|
debugLogger.Log("Raw response: %s", string(responseBytes))
|
|
|
|
fmt.Fprintf(os.Stdout, "Content-Length: %d\r\n\r\n", len(responseBytes))
|
|
os.Stdout.Write(responseBytes)
|
|
|
|
debugLogger.Log("Response sent successfully for request: %s", req.Method)
|
|
log.Printf("Completed request: %s", req.Method)
|
|
}
|
|
}()
|
|
|
|
// Wait for either completion or signal
|
|
select {
|
|
case <-done:
|
|
log.Printf("Input processing completed")
|
|
case sig := <-sigChan:
|
|
log.Printf("Received signal %v, shutting down", sig)
|
|
}
|
|
|
|
log.Printf("MCP stdio server shutdown complete")
|
|
}
|