Foundry MCP Server

import * as fs from "fs/promises"; import * as path from "path"; import { promisify } from "util"; import { exec } from "child_process"; import { FOUNDRY_PATHS } from "./command.js"; const execAsync = promisify(exec); export const DEFAULT_RPC_URL = process.env.RPC_URL || "http://localhost:8545"; export async function resolveRpcUrl(rpcUrl?: string): Promise<string> { if (!rpcUrl) { return DEFAULT_RPC_URL; } // Handle alias lookup in foundry config if (!rpcUrl.startsWith('http')) { try { // Try to find the RPC endpoint in foundry config const configPath = path.join(FOUNDRY_PATHS.homeDir, '.foundry', 'config.toml'); const configExists = await fs.access(configPath).then(() => true).catch(() => false); if (configExists) { const configContent = await fs.readFile(configPath, 'utf8'); const rpcMatch = new RegExp(`\\[rpc_endpoints\\][\\s\\S]*?${rpcUrl}\\s*=\\s*["']([^"']+)["']`).exec(configContent); if (rpcMatch && rpcMatch[1]) { return rpcMatch[1]; } } } catch (error) { console.error("Error resolving RPC from config:", error); } } return rpcUrl; } export async function getAnvilInfo(): Promise<{running: boolean, port?: string, url?: string}> { try { const { stdout } = await execAsync('ps aux | grep anvil | grep -v grep'); if (!stdout) { return { running: false }; } const portMatch = stdout.match(/--port\s+(\d+)/); const port = portMatch ? portMatch[1] : '8545'; return { running: true, port, url: `http://localhost:${port}` }; } catch (error) { return { running: false }; } }