{"version":3,"file":"websocket-provider.mjs","sources":["../../../../src/lib/flags/providers/websocket-provider.ts"],"sourcesContent":["/**\n * @fileoverview WebSocket provider for real-time flag updates.\n *\n * Provides real-time flag synchronization with:\n * - Automatic reconnection\n * - Heartbeat/ping-pong\n * - Message queuing during disconnection\n * - Authentication support\n *\n * @module flags/providers/websocket-provider\n *\n * @example\n * ```typescript\n * const provider = new WebSocketProvider({\n * url: 'wss://api.example.com/flags/ws',\n * authToken: 'your-token',\n * reconnect: {\n * enabled: true,\n * maxAttempts: 10,\n * },\n * });\n *\n * await provider.initialize();\n * provider.connect();\n * ```\n */\n\nimport type {\n FeatureFlag,\n Segment,\n SegmentId,\n} from '../advanced/types';\nimport type {\n FlagProvider,\n WebSocketProviderConfig,\n FlagChangeListener,\n FlagChangeEvent,\n ProviderStats,\n ReconnectConfig,\n} from './types';\n\n// ============================================================================\n// Constants\n// ============================================================================\n\nconst DEFAULT_PING_INTERVAL = 30000; // 30 seconds\nconst DEFAULT_RECONNECT_CONFIG: Required = {\n enabled: true,\n maxAttempts: 10,\n baseDelay: 1000,\n maxDelay: 30000,\n backoffMultiplier: 2,\n};\n\n// ============================================================================\n// Types\n// ============================================================================\n\n/**\n * WebSocket message types.\n */\ntype WSMessageType =\n | 'flags'\n | 'flag_update'\n | 'flag_delete'\n | 'segments'\n | 'segment_update'\n | 'ping'\n | 'pong'\n | 'subscribe'\n | 'unsubscribe'\n | 'error';\n\n/**\n * WebSocket message structure.\n */\ninterface WSMessage {\n type: WSMessageType;\n payload?: unknown;\n timestamp?: string;\n}\n\n/**\n * Connection state.\n */\ntype ConnectionState = 'disconnected' | 'connecting' | 'connected' | 'reconnecting';\n\n// ============================================================================\n// WebSocket Provider\n// ============================================================================\n\n/**\n * WebSocket provider for real-time flag updates.\n */\nexport class WebSocketProvider implements FlagProvider {\n readonly name: string;\n readonly priority: number;\n\n private socket: WebSocket | null = null;\n private flags = new Map();\n private segments = new Map();\n private listeners = new Set();\n private ready = false;\n private config: Required> & {\n initialFlags?: WebSocketProviderConfig['initialFlags'];\n authToken?: WebSocketProviderConfig['authToken'];\n channel?: WebSocketProviderConfig['channel'];\n };\n private connectionState: ConnectionState = 'disconnected';\n private reconnectAttempts = 0;\n private reconnectTimer: ReturnType | null = null;\n private pingTimer: ReturnType | null = null;\n private messageQueue: WSMessage[] = [];\n private lastMessageTime: Date | null = null;\n\n constructor(config: WebSocketProviderConfig) {\n this.name = config.name ?? 'websocket';\n this.priority = config.priority ?? 10; // High priority for real-time\n\n this.config = {\n name: this.name,\n priority: this.priority,\n debug: config.debug ?? false,\n url: config.url,\n initialFlags: config.initialFlags,\n reconnect: { ...DEFAULT_RECONNECT_CONFIG, ...config.reconnect },\n pingInterval: config.pingInterval ?? DEFAULT_PING_INTERVAL,\n authToken: config.authToken,\n channel: config.channel,\n };\n\n // Load initial flags\n if (config.initialFlags) {\n for (const flag of config.initialFlags) {\n this.flags.set(flag.key, flag);\n }\n }\n }\n\n // ==========================================================================\n // Initialization\n // ==========================================================================\n\n /**\n * Initialize the provider.\n */\n async initialize(): Promise {\n this.log('Initializing WebSocket provider');\n this.ready = true;\n this.log('WebSocket provider initialized');\n return Promise.resolve();\n }\n\n // ==========================================================================\n // Connection Management\n // ==========================================================================\n\n /**\n * Connect to the WebSocket server.\n */\n connect(): void {\n if (this.connectionState === 'connected' || this.connectionState === 'connecting') {\n return;\n }\n\n this.connectionState = 'connecting';\n this.log('Connecting to WebSocket server');\n\n try {\n const url = new URL(this.config.url);\n\n // Add auth token as query param if provided\n if (this.config.authToken !== null && this.config.authToken !== undefined && this.config.authToken !== '') {\n url.searchParams.set('token', this.config.authToken);\n }\n\n this.socket = new WebSocket(url.toString());\n this.setupSocketHandlers();\n } catch (error) {\n this.log('Failed to create WebSocket:', error);\n this.handleDisconnect();\n }\n }\n\n /**\n * Disconnect from the WebSocket server.\n */\n disconnect(): void {\n this.stopPing();\n this.stopReconnect();\n\n if (this.socket) {\n this.socket.close(1000, 'Client disconnect');\n this.socket = null;\n }\n\n this.connectionState = 'disconnected';\n this.log('Disconnected from WebSocket server');\n }\n\n /**\n * Get all flags.\n */\n async getFlags(): Promise {\n return Promise.resolve(Array.from(this.flags.values()));\n }\n\n /**\n * Get a flag by key.\n */\n async getFlag(key: string): Promise {\n return Promise.resolve(this.flags.get(key) ?? null);\n }\n\n /**\n * Get all segments.\n */\n async getSegments(): Promise {\n return Promise.resolve(Array.from(this.segments.values()));\n }\n\n /**\n * Get a segment by ID.\n */\n async getSegment(id: SegmentId): Promise {\n return Promise.resolve(this.segments.get(id) ?? null);\n }\n\n /**\n * Check if the provider is ready.\n */\n isReady(): boolean {\n return this.ready;\n }\n\n /**\n * Check if the provider is healthy.\n */\n async isHealthy(): Promise {\n return Promise.resolve(this.connectionState === 'connected');\n }\n\n /**\n * Get connection state.\n */\n getConnectionState(): ConnectionState {\n return this.connectionState;\n }\n\n /**\n * Get connection status.\n */\n getConnectionStatus(): {\n state: ConnectionState;\n reconnectAttempts: number;\n lastMessageTime: Date | null;\n queuedMessages: number;\n } {\n return {\n state: this.connectionState,\n reconnectAttempts: this.reconnectAttempts,\n lastMessageTime: this.lastMessageTime,\n queuedMessages: this.messageQueue.length,\n };\n }\n\n // ==========================================================================\n // Reconnection\n // ==========================================================================\n\n /**\n * Get provider statistics.\n */\n getStats(): ProviderStats {\n return {\n flagCount: this.flags.size,\n segmentCount: this.segments.size,\n requestCount: 0,\n errorCount: 0,\n lastRefresh: this.lastMessageTime ?? 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============================================================================\n// Factory Function\n// ============================================================================\n\n/**\n * Create a WebSocket provider instance.\n */\nexport function createWebSocketProvider(\n config: WebSocketProviderConfig\n): WebSocketProvider {\n return new 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