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| 1 | +import * as crypto from 'crypto'; |
| 2 | +import * as http from 'http'; |
| 3 | +import * as vscode from 'vscode'; |
| 4 | +import { StreamableHTTPServerTransport } from '@modelcontextprotocol/sdk/server/streamableHttp.js'; |
| 5 | +import { SSEServerTransport } from '@modelcontextprotocol/sdk/server/sse.js'; |
| 6 | +import { registerTools, setStopMcpCallback } from './tools'; |
| 7 | +import { SessionManager } from './sessionManager'; |
| 8 | +const { Server } = require('@modelcontextprotocol/sdk/server/index.js'); |
| 9 | + |
| 10 | +const DEFAULT_HOST = '127.0.0.1'; |
| 11 | +const DEFAULT_PORT = 8827; |
| 12 | + |
| 13 | +let mcpServer: any; |
| 14 | +let httpServer: any; |
| 15 | +let sessionManager: SessionManager | undefined; |
| 16 | +let transport: StreamableHTTPServerTransport | undefined; |
| 17 | +const sseTransports = new Map<string, SSEServerTransport>(); |
| 18 | + |
| 19 | +function createMcpServer(): any { |
| 20 | + const server = new Server( |
| 21 | + { name: 'emmylua-mcp', version: '0.1.0' }, |
| 22 | + { capabilities: { tools: {} } }, |
| 23 | + ); |
| 24 | + registerTools(server, sessionManager!); |
| 25 | + return server; |
| 26 | +} |
| 27 | +export const mcpOutput = vscode.window.createOutputChannel('EmmyLua MCP'); |
| 28 | + |
| 29 | +function log(msg: string): void { |
| 30 | + mcpOutput.appendLine(`[${new Date().toLocaleTimeString()}] ${msg}`); |
| 31 | +} |
| 32 | + |
| 33 | +function corsWrap(res: any): void { |
| 34 | + const orig = res.writeHead.bind(res); |
| 35 | + res.writeHead = function (this: any, status: number, ...args: any[]) { |
| 36 | + if (!this.hasHeader('Access-Control-Allow-Origin')) { |
| 37 | + this.setHeader('Access-Control-Allow-Origin', '*'); |
| 38 | + this.setHeader('Access-Control-Allow-Methods', 'GET, POST, OPTIONS, DELETE'); |
| 39 | + this.setHeader('Access-Control-Allow-Headers', 'Content-Type, Accept, Mcp-Session-Id, Mcp-Protocol-Version'); |
| 40 | + this.setHeader('Access-Control-Expose-Headers', 'mcp-session-id'); |
| 41 | + } |
| 42 | + return orig(status, ...args); |
| 43 | + }; |
| 44 | +} |
| 45 | + |
| 46 | +function tryListen(host: string, startPort: number, maxRetries: number): Promise<{ server: http.Server; port: number }> { |
| 47 | + return new Promise((resolve, reject) => { |
| 48 | + const attempt = (i: number) => { |
| 49 | + if (i >= maxRetries) { |
| 50 | + reject(new Error(`All ports ${startPort}-${startPort + maxRetries - 1} in use`)); |
| 51 | + return; |
| 52 | + } |
| 53 | + const p = startPort + i; |
| 54 | + const s = http.createServer(async (req, res) => { |
| 55 | + corsWrap(res); |
| 56 | + if (req.method === 'OPTIONS') { |
| 57 | + res.writeHead(204); |
| 58 | + res.end(); |
| 59 | + return; |
| 60 | + } |
| 61 | + const url = new URL(req.url || '/', `http://${req.headers.host || 'localhost'}`); |
| 62 | + if (url.pathname === '/mcp' && transport) { |
| 63 | + try { |
| 64 | + await transport.handleRequest(req, res); |
| 65 | + } catch (e: any) { |
| 66 | + if (!res.headersSent) { |
| 67 | + try { res.writeHead(400).end(e.message); } catch {} |
| 68 | + } |
| 69 | + } |
| 70 | + } else if (url.pathname === '/sse') { |
| 71 | + try { |
| 72 | + const sseTransport = new SSEServerTransport('/messages', res); |
| 73 | + sseTransports.set(sseTransport.sessionId, sseTransport); |
| 74 | + res.on('close', () => { |
| 75 | + sseTransports.delete(sseTransport.sessionId); |
| 76 | + }); |
| 77 | + const sseServer = createMcpServer(); |
| 78 | + await sseServer.connect(sseTransport); |
| 79 | + } catch (e: any) { |
| 80 | + if (!res.headersSent) { |
| 81 | + try { res.writeHead(500).end(e.message); } catch {} |
| 82 | + } |
| 83 | + } |
| 84 | + } else if (url.pathname === '/messages' && req.method === 'POST') { |
| 85 | + const sessionId = url.searchParams.get('sessionId'); |
| 86 | + if (!sessionId) { |
| 87 | + res.writeHead(400).end('Missing sessionId parameter'); |
| 88 | + return; |
| 89 | + } |
| 90 | + const sseTransport = sseTransports.get(sessionId); |
| 91 | + if (!sseTransport) { |
| 92 | + res.writeHead(404).end('Session not found'); |
| 93 | + return; |
| 94 | + } |
| 95 | + try { |
| 96 | + await sseTransport.handlePostMessage(req, res); |
| 97 | + } catch (e: any) { |
| 98 | + if (!res.headersSent) { |
| 99 | + try { res.writeHead(500).end(e.message); } catch {} |
| 100 | + } |
| 101 | + } |
| 102 | + } else { |
| 103 | + res.writeHead(404); |
| 104 | + res.end(); |
| 105 | + } |
| 106 | + }); |
| 107 | + s.once('error', (e: any) => { |
| 108 | + s.close(); |
| 109 | + if (e.code === 'EADDRINUSE') { |
| 110 | + attempt(i + 1); |
| 111 | + } else { |
| 112 | + reject(e); |
| 113 | + } |
| 114 | + }); |
| 115 | + s.listen(p, host, () => { |
| 116 | + resolve({ server: s, port: p }); |
| 117 | + }); |
| 118 | + }; |
| 119 | + attempt(0); |
| 120 | + }); |
| 121 | +} |
| 122 | + |
| 123 | +export async function startMcpServer(): Promise<void> { |
| 124 | + const host = process.env['EMMY_MCP_HOST'] || DEFAULT_HOST; |
| 125 | + const port = parseInt(process.env['EMMY_MCP_PORT'] || String(DEFAULT_PORT), 10); |
| 126 | + |
| 127 | + sessionManager = new SessionManager(); |
| 128 | + setStopMcpCallback(stopMcpServer); |
| 129 | + |
| 130 | + const mcpServerInstance = createMcpServer(); |
| 131 | + transport = new StreamableHTTPServerTransport({ |
| 132 | + sessionIdGenerator: () => crypto.randomUUID(), |
| 133 | + }); |
| 134 | + await mcpServerInstance.connect(transport); |
| 135 | + mcpServer = mcpServerInstance; |
| 136 | + |
| 137 | + try { |
| 138 | + const { server: httpSrv, port: actualPort } = await tryListen(host, port, 10); |
| 139 | + httpServer = httpSrv; |
| 140 | + log(`MCP server started at http://${host}:${actualPort}/mcp (Streamable HTTP) and /sse (SSE)`); |
| 141 | + } catch (e: any) { |
| 142 | + log(`Failed to start: ${e.message}`); |
| 143 | + } |
| 144 | +} |
| 145 | + |
| 146 | +export function stopMcpServer(): void { |
| 147 | + sessionManager?.dispose(); |
| 148 | + for (const [, st] of sseTransports) { |
| 149 | + st.close().catch(() => {}); |
| 150 | + } |
| 151 | + sseTransports.clear(); |
| 152 | + if (mcpServer) { |
| 153 | + mcpServer.close().catch(() => {}); |
| 154 | + } |
| 155 | + if (transport) { |
| 156 | + transport.close().catch(() => {}); |
| 157 | + } |
| 158 | + if (httpServer) { |
| 159 | + httpServer.close(); |
| 160 | + } |
| 161 | + mcpServer = undefined; |
| 162 | + httpServer = undefined; |
| 163 | + sessionManager = undefined; |
| 164 | + transport = undefined; |
| 165 | +} |
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