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* Cache Plugin for GQP\n * Query result caching with multiple backends\n */\n\nimport type {\n GQPPlugin,\n GQPNode,\n PluginContext,\n QueryFilters,\n GQPEngine,\n} from \"../../core/types.js\";\n\ninterface CacheEntry {\n value: T;\n expiresAt: number;\n createdAt: number;\n}\n\nexport interface CacheProvider {\n get(key: string): Promise;\n set(key: string, value: T, ttl: number): Promise;\n delete(key: string): Promise;\n clear(): Promise;\n}\n\nexport class MemoryCacheProvider implements CacheProvider {\n private cache: Map = new Map();\n private maxSize: number;\n private cleanupInterval?: ReturnType;\n\n constructor(maxSize = 1000, cleanupIntervalMs = 60000) {\n this.maxSize = maxSize;\n\n if (cleanupIntervalMs > 0) {\n this.cleanupInterval = setInterval(() => {\n this.evictExpired();\n }, cleanupIntervalMs);\n }\n }\n\n async get(key: string): Promise {\n const entry = this.cache.get(key);\n\n if (!entry) return null;\n\n if (Date.now() > entry.expiresAt) {\n this.cache.delete(key);\n return null;\n }\n\n return entry.value as T;\n }\n\n async set(key: string, value: T, ttl: number): Promise {\n if (this.cache.size >= this.maxSize) {\n this.evictOldest();\n }\n\n this.cache.set(key, {\n value,\n expiresAt: Date.now() + ttl * 1000,\n createdAt: Date.now(),\n });\n }\n\n async delete(key: string): Promise {\n this.cache.delete(key);\n }\n\n async clear(): Promise {\n this.cache.clear();\n }\n\n destroy(): void {\n if (this.cleanupInterval) {\n clearInterval(this.cleanupInterval);\n this.cleanupInterval = undefined;\n }\n this.cache.clear();\n }\n\n private evictOldest(): void {\n let oldestKey: string | null = null;\n let oldestTime = Infinity;\n\n for (const [key, entry] of this.cache.entries()) {\n if (entry.createdAt < oldestTime) {\n oldestTime = entry.createdAt;\n oldestKey = key;\n }\n }\n\n if (oldestKey) {\n this.cache.delete(oldestKey);\n }\n }\n\n private evictExpired(): void {\n const now = Date.now();\n for (const [key, entry] of this.cache.entries()) {\n if (now > entry.expiresAt) {\n this.cache.delete(key);\n }\n }\n }\n\n size(): number {\n return this.cache.size;\n }\n}\n\nexport interface CachePluginConfig {\n provider?: \"memory\" | \"redis\" | CacheProvider;\n redis?: {\n url: string;\n prefix?: string;\n };\n ttl?: number;\n maxSize?: number;\n cleanupInterval?: number;\n strategies?: Record<\n string,\n {\n ttl?: number;\n invalidateOn?: string[];\n }\n >;\n}\n\nexport class CachePlugin implements GQPPlugin {\n name = \"cache\";\n private config: CachePluginConfig;\n private provider: CacheProvider;\n private memoryProvider?: MemoryCacheProvider;\n private pendingQueries: Map> = new Map();\n private stats = {\n hits: 0,\n misses: 0,\n };\n\n constructor(config: CachePluginConfig = {}) {\n this.config = {\n ttl: 300,\n maxSize: 1000,\n cleanupInterval: 60000,\n ...config,\n };\n\n if (config.provider instanceof Object && \"get\" in config.provider) {\n this.provider = config.provider as CacheProvider;\n } else if (config.provider === \"redis\" && config.redis) {\n this.memoryProvider = new MemoryCacheProvider(\n this.config.maxSize,\n this.config.cleanupInterval,\n );\n this.provider = this.memoryProvider;\n } else {\n this.memoryProvider = new MemoryCacheProvider(\n this.config.maxSize,\n this.config.cleanupInterval,\n );\n this.provider = this.memoryProvider;\n }\n }\n\n async onInit(_engine: GQPEngine): Promise {}\n\n async onDestroy(): Promise {\n if (this.memoryProvider) {\n this.memoryProvider.destroy();\n }\n this.pendingQueries.clear();\n }\n\n async onPreQuery(\n node: GQPNode,\n filters: QueryFilters,\n context: PluginContext,\n ): Promise {\n const cacheKey = this.generateCacheKey(node.name, context);\n\n const cached = await this.provider.get(cacheKey);\n if (cached !== null) {\n this.stats.hits++;\n (context as { _cachedResults?: unknown[] })._cachedResults = cached;\n } else {\n this.stats.misses++;\n (context as { _cacheKey?: string })._cacheKey = cacheKey;\n }\n\n return filters;\n }\n\n async onPostQuery(\n node: GQPNode,\n results: unknown[],\n context: PluginContext,\n ): Promise {\n const ctx = context as { _cachedResults?: unknown[]; _cacheKey?: string };\n\n if (ctx._cachedResults) {\n return ctx._cachedResults;\n }\n\n if (ctx._cacheKey) {\n const ttl = this.getTTL(node.name);\n await this.provider.set(ctx._cacheKey, results, ttl);\n }\n\n return results;\n }\n\n private generateCacheKey(nodeName: string, context: PluginContext): string {\n const parts = [\n \"gqp\",\n nodeName,\n this.safeStringify(context.filters),\n this.safeStringify(context.options),\n ];\n\n if (context.query) {\n parts.push(context.query);\n }\n\n const str = parts.join(\":\");\n let hash = 0;\n for (let i = 0; i < str.length; i++) {\n const char = str.charCodeAt(i);\n hash = (hash << 5) - hash + char;\n hash = hash & hash;\n }\n\n return `gqp:${nodeName}:${Math.abs(hash).toString(36)}`;\n }\n\n private safeStringify(obj: unknown): string {\n const seen = new WeakSet();\n return JSON.stringify(obj, (_, value) => {\n if (typeof value === \"object\" && value !== null) {\n if (seen.has(value)) return \"[circular]\";\n seen.add(value);\n }\n return value;\n });\n }\n\n private getTTL(nodeName: string): number {\n const strategy = this.config.strategies?.[nodeName];\n return strategy?.ttl || this.config.ttl || 300;\n }\n\n async invalidate(_pattern: string): Promise {\n if (this.memoryProvider) {\n await this.memoryProvider.clear();\n }\n }\n\n getStats(): {\n hits: number;\n misses: number;\n hitRate: number;\n } {\n const total = this.stats.hits + this.stats.misses;\n return {\n ...this.stats,\n hitRate: total > 0 ? this.stats.hits / total : 0,\n };\n }\n\n async clear(): Promise {\n await this.provider.clear();\n this.stats.hits = 0;\n this.stats.misses = 0;\n }\n}\n\nexport function createCachePlugin(config: CachePluginConfig = {}): CachePlugin {\n return new CachePlugin(config);\n}\n"]}