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});\n }\n\n /**\n * Get a value from the cache\n */\n get(key: string): T | null {\n const entry = this.cache.get(key);\n\n if (!entry) {\n return null;\n }\n\n // Check if expired\n if (Date.now() > entry.expiresAt) {\n this.cache.delete(key);\n return null;\n }\n\n return entry.value;\n }\n\n /**\n * Check if key exists and is not expired\n */\n has(key: string): boolean {\n const entry = this.cache.get(key);\n\n if (!entry) {\n return false;\n }\n\n if (Date.now() > entry.expiresAt) {\n this.cache.delete(key);\n return false;\n }\n\n return true;\n }\n\n /**\n * Delete a key from the cache\n */\n delete(key: string): boolean {\n return this.cache.delete(key);\n }\n\n /**\n * Clear all entries\n */\n clear(): void {\n this.cache.clear();\n }\n\n /**\n * Get cache size\n */\n size(): number {\n return this.cache.size;\n }\n\n /**\n * Get all keys\n */\n keys(): string[] {\n return Array.from(this.cache.keys());\n }\n\n /**\n * Remove expired entries\n */\n cleanup(): number {\n const now = Date.now();\n let removed = 0;\n\n for (const [key, entry] of this.cache.entries()) {\n if (now > entry.expiresAt) {\n this.cache.delete(key);\n removed++;\n }\n }\n\n return removed;\n }\n\n /**\n * Get cache statistics\n */\n getStats(): {\n size: number;\n maxSize: number;\n totalSize: number;\n oldestEntry: number | null;\n newestEntry: number | null;\n } {\n let totalSize = 0;\n let oldestEntry: number | null = null;\n let newestEntry: number | null = null;\n\n for (const entry of this.cache.values()) {\n totalSize += entry.size;\n\n if (oldestEntry === null || entry.expiresAt < oldestEntry) {\n oldestEntry = entry.expiresAt;\n }\n\n if (newestEntry === null || entry.expiresAt > newestEntry) {\n newestEntry = entry.expiresAt;\n }\n }\n\n return {\n size: this.cache.size,\n maxSize: this.maxSize,\n totalSize,\n oldestEntry,\n newestEntry,\n };\n }\n\n /**\n * Evict the oldest entry\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.expiresAt < oldestTime) {\n oldestTime = entry.expiresAt;\n oldestKey = key;\n }\n }\n\n if (oldestKey) {\n this.cache.delete(oldestKey);\n }\n }\n\n /**\n * Estimate size of value in bytes\n */\n private estimateSize(value: T): number {\n try {\n return JSON.stringify(value).length;\n } catch {\n return 1; // Fallback for non-serializable values\n }\n }\n}\n","/**\n * LRU (Least Recently Used) Cache Implementation\n * Evicts least recently used entries when capacity is reached\n */\n\nexport interface LRUCacheOptions {\n maxSize?: number; // Maximum number of entries\n maxMemory?: number; // Maximum memory in bytes\n defaultTTL?: number; // Default TTL in milliseconds\n}\n\ninterface LRUNode {\n key: string;\n value: T;\n expiresAt: number;\n size: number;\n prev: LRUNode | null;\n next: LRUNode | null;\n}\n\nexport class LRUCache {\n private cache: Map>;\n private head: LRUNode | null;\n private tail: LRUNode | null;\n private maxSize: number;\n private maxMemory: number;\n private currentMemory: number;\n private defaultTTL: number;\n\n constructor(options: LRUCacheOptions = {}) {\n this.cache = new Map();\n this.head = null;\n this.tail = null;\n this.maxSize = options.maxSize || 1000;\n this.maxMemory = options.maxMemory || 50 * 1024 * 1024; // 50MB default\n this.currentMemory = 0;\n this.defaultTTL = options.defaultTTL || 600000; // 10 minutes\n }\n\n /**\n * Set a value in the cache\n */\n set(key: string, value: T, ttl?: number): void {\n const size = this.estimateSize(value);\n const expiresAt = Date.now() + (ttl || this.defaultTTL);\n\n // If key exists, remove old node\n if (this.cache.has(key)) {\n this.remove(key);\n }\n\n // Evict until we have space\n while (\n (this.cache.size >= this.maxSize || this.currentMemory + size > this.maxMemory) &&\n this.tail\n ) {\n this.removeTail();\n }\n\n // Create new node\n const node: LRUNode = {\n key,\n value,\n expiresAt,\n size,\n prev: null,\n next: null,\n };\n\n this.cache.set(key, node);\n this.addToHead(node);\n this.currentMemory += size;\n }\n\n /**\n * Get a value from the cache\n */\n get(key: string): T | null {\n const node = this.cache.get(key);\n\n if (!node) {\n return null;\n }\n\n // Check if expired\n if (Date.now() > node.expiresAt) {\n this.remove(key);\n return null;\n }\n\n // Move to head (most recently used)\n this.moveToHead(node);\n\n return node.value;\n }\n\n /**\n * Check if key exists and is not expired\n */\n has(key: string): boolean {\n const node = this.cache.get(key);\n\n if (!node) {\n return false;\n }\n\n if (Date.now() > node.expiresAt) {\n this.remove(key);\n return false;\n }\n\n return true;\n }\n\n /**\n * Delete a key from the cache\n */\n delete(key: string): boolean {\n return this.remove(key);\n }\n\n /**\n * Clear all entries\n */\n clear(): void {\n this.cache.clear();\n this.head = null;\n this.tail = null;\n this.currentMemory = 0;\n }\n\n /**\n * Get cache size\n */\n size(): number {\n return this.cache.size;\n }\n\n /**\n * Get all keys (from most to least recently used)\n */\n keys(): string[] {\n const keys: string[] = [];\n let current = this.head;\n\n while (current) {\n keys.push(current.key);\n current = current.next;\n }\n\n return keys;\n }\n\n /**\n * Remove expired entries\n */\n cleanup(): number {\n const now = Date.now();\n let removed = 0;\n const keysToRemove: string[] = [];\n\n for (const [key, node] of this.cache.entries()) {\n if (now > node.expiresAt) {\n keysToRemove.push(key);\n }\n }\n\n for (const key of keysToRemove) {\n this.remove(key);\n removed++;\n }\n\n return removed;\n }\n\n /**\n * Get cache statistics\n */\n getStats(): {\n size: number;\n maxSize: number;\n memoryUsed: number;\n maxMemory: number;\n hitRate?: number;\n } {\n return {\n size: this.cache.size,\n maxSize: this.maxSize,\n memoryUsed: this.currentMemory,\n maxMemory: this.maxMemory,\n };\n }\n\n /**\n * Add node to head of list\n */\n private addToHead(node: LRUNode): void {\n node.next = this.head;\n node.prev = null;\n\n if (this.head) {\n this.head.prev = node;\n }\n\n this.head = node;\n\n if (!this.tail) {\n this.tail = node;\n }\n }\n\n /**\n * Remove node from list\n */\n private removeNode(node: LRUNode): void {\n if (node.prev) {\n node.prev.next = node.next;\n } else {\n this.head = node.next;\n }\n\n if (node.next) {\n node.next.prev = node.prev;\n } else {\n this.tail = node.prev;\n }\n }\n\n /**\n * Move node to head of list\n */\n private moveToHead(node: LRUNode): void {\n this.removeNode(node);\n this.addToHead(node);\n }\n\n /**\n * Remove tail (least recently used)\n */\n private removeTail(): void {\n if (!this.tail) {\n return;\n }\n\n const key = this.tail.key;\n this.remove(key);\n }\n\n /**\n * Remove a key from cache\n */\n private remove(key: string): boolean {\n const node = this.cache.get(key);\n\n if (!node) {\n return false;\n }\n\n this.removeNode(node);\n this.cache.delete(key);\n this.currentMemory -= node.size;\n\n return true;\n }\n\n /**\n * Estimate size of value in bytes\n */\n private estimateSize(value: T): number {\n try {\n return JSON.stringify(value).length;\n } catch {\n return 1;\n }\n }\n}\n","/**\n * Request Deduplicator\n * Prevents duplicate concurrent requests for the same data\n */\n\nimport { EventEmitter } from 'eventemitter3';\nimport crypto from 'crypto';\n\nexport interface DeduplicationOptions {\n enabled?: boolean;\n ttl?: number; // How long to deduplicate (ms)\n maxPendingRequests?: number;\n}\n\ninterface PendingRequest {\n promise: Promise;\n timestamp: number;\n resolvers: Array<(value: T) => void>;\n rejectors: Array<(error: Error) => void>;\n}\n\nexport class RequestDeduplicator extends EventEmitter {\n private pendingRequests: Map>;\n private enabled: boolean;\n private ttl: number;\n private maxPendingRequests: number;\n private stats: {\n totalRequests: number;\n deduplicatedRequests: number;\n activeDeduplications: number;\n };\n\n constructor(options: DeduplicationOptions = {}) {\n super();\n this.pendingRequests = new Map();\n this.enabled = options.enabled !== false;\n this.ttl = options.ttl || 5000; // 5 seconds default\n this.maxPendingRequests = options.maxPendingRequests || 1000;\n this.stats = {\n totalRequests: 0,\n deduplicatedRequests: 0,\n activeDeduplications: 0,\n };\n }\n\n /**\n * Execute a request with deduplication\n */\n async execute(\n key: string | object,\n executor: () => Promise,\n options?: { ttl?: number },\n ): Promise {\n this.stats.totalRequests++;\n\n if (!this.enabled) {\n return executor();\n }\n\n const cacheKey = this.generateKey(key);\n const pending = this.pendingRequests.get(cacheKey);\n\n // If there's a pending request, wait for it\n if (pending) {\n this.stats.deduplicatedRequests++;\n this.emit('deduplicated', { key: cacheKey });\n\n // Return a promise that resolves when the original request completes\n return new Promise((resolve, reject) => {\n pending.resolvers.push(resolve);\n pending.rejectors.push(reject);\n });\n }\n\n // Check capacity\n if (this.pendingRequests.size >= this.maxPendingRequests) {\n this.cleanup();\n }\n\n // Execute the request\n const resolvers: Array<(value: T) => void> = [];\n const rejectors: Array<(error: Error) => void> = [];\n\n const promise = executor()\n .then((result) => {\n // Resolve all waiting promises\n resolvers.forEach((resolve) => resolve(result));\n this.pendingRequests.delete(cacheKey);\n this.stats.activeDeduplications = this.pendingRequests.size;\n return result;\n })\n .catch((error) => {\n // Reject all waiting promises\n rejectors.forEach((reject) => reject(error));\n this.pendingRequests.delete(cacheKey);\n this.stats.activeDeduplications = this.pendingRequests.size;\n throw error;\n });\n\n // Store pending request\n this.pendingRequests.set(cacheKey, {\n promise,\n timestamp: Date.now(),\n resolvers,\n rejectors,\n });\n\n this.stats.activeDeduplications = this.pendingRequests.size;\n\n // Auto-cleanup after TTL\n const ttl = options?.ttl || this.ttl;\n setTimeout(() => {\n this.pendingRequests.delete(cacheKey);\n this.stats.activeDeduplications = this.pendingRequests.size;\n }, ttl);\n\n return promise;\n }\n\n /**\n * Generate cache key from input\n */\n private generateKey(input: string | object): string {\n if (typeof input === 'string') {\n return input;\n }\n\n // Generate hash from object\n const json = JSON.stringify(input, Object.keys(input).sort());\n return crypto.createHash('sha256').update(json).digest('hex').substring(0, 16);\n }\n\n /**\n * Clean up expired pending requests\n */\n private cleanup(): void {\n const now = Date.now();\n const keysToDelete: string[] = [];\n\n for (const [key, pending] of this.pendingRequests.entries()) {\n if (now - pending.timestamp > this.ttl) {\n keysToDelete.push(key);\n }\n }\n\n for (const key of keysToDelete) {\n this.pendingRequests.delete(key);\n }\n\n this.stats.activeDeduplications = this.pendingRequests.size;\n }\n\n /**\n * Clear all pending requests\n */\n clear(): void {\n this.pendingRequests.clear();\n this.stats.activeDeduplications = 0;\n }\n\n /**\n * Get deduplication statistics\n */\n getStats(): {\n totalRequests: number;\n deduplicatedRequests: number;\n activeDeduplications: number;\n deduplicationRate: number;\n } {\n return {\n ...this.stats,\n deduplicationRate:\n this.stats.totalRequests > 0\n ? this.stats.deduplicatedRequests / this.stats.totalRequests\n : 0,\n };\n }\n\n /**\n * Enable/disable deduplication\n */\n setEnabled(enabled: boolean): void {\n this.enabled = enabled;\n if (!enabled) {\n this.clear();\n }\n }\n\n /**\n * Check if deduplication is enabled\n */\n isEnabled(): boolean {\n return this.enabled;\n }\n}\n","type LogLevel = 'debug' | 'info' | 'warn' | 'error';\n\ninterface LoggerOptions {\n enabled: boolean;\n level: LogLevel;\n prefix?: string;\n}\n\nconst LOG_LEVELS: Record = {\n debug: 0,\n info: 1,\n warn: 2,\n error: 3,\n};\n\nexport class Logger {\n private options: LoggerOptions;\n\n constructor(options: Partial = {}) {\n this.options = {\n enabled: options.enabled ?? true,\n level: options.level ?? 'info',\n prefix: options.prefix ?? '[OpenRouter]',\n };\n }\n\n private shouldLog(level: LogLevel): boolean {\n if (!this.options.enabled) return false;\n return LOG_LEVELS[level] >= LOG_LEVELS[this.options.level];\n }\n\n private formatMessage(level: LogLevel, message: string, meta?: Record): string {\n const timestamp = new Date().toISOString();\n const prefix = this.options.prefix;\n let formatted = `${timestamp} ${prefix} [${level.toUpperCase()}] ${message}`;\n\n if (meta && Object.keys(meta).length > 0) {\n formatted += `\\n${JSON.stringify(meta, null, 2)}`;\n }\n\n return formatted;\n }\n\n debug(message: string, meta?: Record): void {\n if (this.shouldLog('debug')) {\n // eslint-disable-next-line no-console\n console.debug(this.formatMessage('debug', message, meta));\n }\n }\n\n info(message: string, meta?: Record): void {\n if (this.shouldLog('info')) {\n // eslint-disable-next-line no-console\n console.info(this.formatMessage('info', message, meta));\n }\n }\n\n warn(message: string, meta?: Record): void {\n if (this.shouldLog('warn')) {\n console.warn(this.formatMessage('warn', message, meta));\n }\n }\n\n error(message: string, error?: Error | Record): void {\n if (this.shouldLog('error')) {\n const meta = error instanceof Error ? { message: error.message, stack: error.stack } : error;\n console.error(this.formatMessage('error', message, meta));\n }\n }\n\n setLevel(level: LogLevel): void {\n this.options.level = level;\n }\n\n setEnabled(enabled: boolean): void {\n this.options.enabled = enabled;\n }\n}\n\nexport const createLogger = (options?: Partial): Logger => {\n return new Logger(options);\n};\n","/**\n * Cache Manager\n * Orchestrates caching with multiple strategies\n */\n\nimport { EventEmitter } from 'eventemitter3';\nimport { MemoryCache } from './MemoryCache';\nimport { LRUCache } from './LRUCache';\nimport { RequestDeduplicator } from './RequestDeduplicator';\nimport { Logger } from '../utils/logger';\n\nexport type CacheStrategy = 'memory' | 'lru' | 'none';\n\nexport interface CacheManagerOptions {\n strategy?: CacheStrategy;\n maxSize?: number;\n maxMemory?: number;\n defaultTTL?: number;\n deduplication?: boolean;\n logger?: Logger;\n}\n\nexport interface CacheStats {\n strategy: CacheStrategy;\n size: number;\n hits: number;\n misses: number;\n hitRate: number;\n deduplicationStats?: {\n totalRequests: number;\n deduplicatedRequests: number;\n deduplicationRate: number;\n };\n}\n\nexport class CacheManager extends EventEmitter {\n private cache: MemoryCache | LRUCache | null;\n private deduplicator: RequestDeduplicator;\n private strategy: CacheStrategy;\n private logger: Logger;\n private stats: {\n hits: number;\n misses: number;\n };\n\n constructor(options: CacheManagerOptions = {}) {\n super();\n this.strategy = options.strategy || 'lru';\n this.logger = options.logger || new Logger({ enabled: false });\n this.stats = {\n hits: 0,\n misses: 0,\n };\n\n // Initialize cache based on strategy\n switch (this.strategy) {\n case 'memory':\n this.cache = new MemoryCache({\n maxSize: options.maxSize,\n defaultTTL: options.defaultTTL,\n });\n break;\n case 'lru':\n this.cache = new LRUCache({\n maxSize: options.maxSize,\n maxMemory: options.maxMemory,\n defaultTTL: options.defaultTTL,\n });\n break;\n case 'none':\n this.cache = null;\n break;\n default:\n throw new Error(`Unknown cache strategy: ${this.strategy}`);\n }\n\n // Initialize deduplicator\n this.deduplicator = new RequestDeduplicator({\n enabled: options.deduplication !== false,\n });\n\n // Set up cleanup interval\n if (this.cache) {\n setInterval(() => {\n this.cleanup();\n }, 60000); // Clean up every minute\n }\n }\n\n /**\n * Get a value from cache\n */\n async get(key: string): Promise {\n await Promise.resolve(); // Keep async for consistent interface\n if (!this.cache) {\n this.stats.misses++;\n return null;\n }\n\n const value = this.cache.get(key);\n\n if (value !== null) {\n this.stats.hits++;\n this.logger.debug('Cache hit', { key });\n this.emit('hit', { key });\n return value as T;\n }\n\n this.stats.misses++;\n this.logger.debug('Cache miss', { key });\n this.emit('miss', { key });\n return null;\n }\n\n /**\n * Set a value in cache\n */\n async set(key: string, value: T, ttl?: number): Promise {\n await Promise.resolve(); // Keep async for consistent interface\n if (!this.cache) {\n return;\n }\n\n this.cache.set(key, value, ttl);\n this.logger.debug('Cache set', { key, ttl });\n this.emit('set', { key, ttl });\n }\n\n /**\n * Get or compute a value with caching and deduplication\n */\n async getOrCompute(\n key: string,\n computer: () => Promise,\n options?: { ttl?: number; skipCache?: boolean },\n ): Promise {\n // Check cache first (unless skipped)\n if (!options?.skipCache) {\n const cached = await this.get(key);\n if (cached !== null) {\n return cached;\n }\n }\n\n // Use deduplicator to prevent concurrent requests\n const value = await this.deduplicator.execute(key, computer, options);\n\n // Store in cache\n if (!options?.skipCache) {\n await this.set(key, value, options?.ttl);\n }\n\n return value;\n }\n\n /**\n * Delete a key from cache\n */\n async delete(key: string): Promise {\n await Promise.resolve(); // Keep async for consistent interface\n if (!this.cache) {\n return false;\n }\n\n const result = this.cache.delete(key);\n if (result) {\n this.logger.debug('Cache delete', { key });\n this.emit('delete', { key });\n }\n return result;\n }\n\n /**\n * Check if key exists in cache\n */\n async has(key: string): Promise {\n await Promise.resolve(); // Keep async for consistent interface\n if (!this.cache) {\n return false;\n }\n\n return this.cache.has(key);\n }\n\n /**\n * Clear all cache entries\n */\n async clear(): Promise {\n await Promise.resolve(); // Keep async for consistent interface\n if (!this.cache) {\n return;\n }\n\n this.cache.clear();\n this.deduplicator.clear();\n this.stats.hits = 0;\n this.stats.misses = 0;\n this.logger.info('Cache cleared');\n this.emit('clear');\n }\n\n /**\n * Get cache size\n */\n size(): number {\n if (!this.cache) {\n return 0;\n }\n\n return this.cache.size();\n }\n\n /**\n * Get all keys\n */\n keys(): string[] {\n if (!this.cache) {\n return [];\n }\n\n return this.cache.keys();\n }\n\n /**\n * Clean up expired entries\n */\n cleanup(): number {\n if (!this.cache) {\n return 0;\n }\n\n const removed = this.cache.cleanup();\n if (removed > 0) {\n this.logger.debug('Cache cleanup', { removed });\n this.emit('cleanup', { removed });\n }\n return removed;\n }\n\n /**\n * Get cache statistics\n */\n getStats(): CacheStats {\n const totalRequests = this.stats.hits + this.stats.misses;\n const hitRate = totalRequests > 0 ? this.stats.hits / totalRequests : 0;\n\n const stats: CacheStats = {\n strategy: this.strategy,\n size: this.size(),\n hits: this.stats.hits,\n misses: this.stats.misses,\n hitRate,\n };\n\n // Add deduplication stats\n const dedupStats = this.deduplicator.getStats();\n if (dedupStats.totalRequests > 0) {\n stats.deduplicationStats = {\n totalRequests: dedupStats.totalRequests,\n deduplicatedRequests: dedupStats.deduplicatedRequests,\n deduplicationRate: dedupStats.deduplicationRate,\n };\n }\n\n return stats;\n }\n\n /**\n * Generate cache key from request parameters\n */\n static generateKey(params: Record): string {\n const sorted = Object.keys(params)\n .sort()\n .reduce(\n (acc, key) => {\n acc[key] = params[key];\n return acc;\n },\n {} as Record,\n );\n\n return JSON.stringify(sorted);\n }\n\n /**\n * Enable/disable deduplication\n */\n setDeduplicationEnabled(enabled: boolean): void {\n this.deduplicator.setEnabled(enabled);\n }\n\n /**\n * Check if deduplication is enabled\n */\n isDeduplicationEnabled(): boolean {\n return this.deduplicator.isEnabled();\n }\n}\n"]}