ISIS MCP

import Database from "better-sqlite3"; import { homedir } from "os"; import { join } from "path"; interface CacheEntry { url: string; content: string; markdown: string; title: string; cached_at: number; } const CACHE_TTL = 3600000; let db: Database.Database | null = null; function getDatabase(): Database.Database { if (!db) { const dbPath = join(homedir(), ".isis-mcp-cache.db"); db = new Database(dbPath); db.exec(` CREATE TABLE IF NOT EXISTS cache ( url TEXT PRIMARY KEY, content TEXT, markdown TEXT, title TEXT, cached_at INTEGER ) `); } return db; } export function getFromCache(url: string): CacheEntry | null { const database = getDatabase(); const row = database .prepare("SELECT * FROM cache WHERE url = ?") .get(url) as CacheEntry | undefined; if (!row) return null; if (Date.now() - row.cached_at > CACHE_TTL) { database.prepare("DELETE FROM cache WHERE url = ?").run(url); return null; } return row; } export function saveToCache( url: string, data: { content: string; markdown: string; title: string } ): void { const database = getDatabase(); database .prepare( "INSERT OR REPLACE INTO cache (url, content, markdown, title, cached_at) VALUES (?, ?, ?, ?, ?)" ) .run(url, data.content, data.markdown, data.title, Date.now()); } export function closeCache(): void { if (db) { db.close(); db = null; } } export function generateContentHandle(url: string): string { return Buffer.from(url).toString('base64'); } export function decodeContentHandle(handle: string): string | null { try { return Buffer.from(handle, 'base64').toString('utf-8'); } catch (error) { return null; } }