757 lines
24 KiB
TypeScript
757 lines
24 KiB
TypeScript
/**
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* Redis Client for meta-fuse
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* Reads metadata from Redis (written by meta-sort)
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*
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* Key features:
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* - FILES_VOLUME path resolution (prepends /files/ to relative paths)
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* - Parses meta-sort hash format into structured metadata
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* - Redis pub/sub support for real-time updates
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*/
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import { Redis } from 'ioredis';
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import { Logger } from 'tslog';
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import * as os from 'os';
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import type { IKVClient, KeyValuePair } from './IKVClient.js';
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const logger = new Logger({ name: 'RedisClient' });
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/**
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* Stream message from Redis Streams
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*/
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export interface StreamMessage {
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id: string;
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type: 'batch' | 'reset' | 'plugin:complete';
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payload: string;
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timestamp: string;
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}
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/**
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* Stream consumer callback
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*/
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export type StreamMessageHandler = (message: StreamMessage) => Promise<void>;
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/**
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* Full metadata structure including fields needed for virtual path computation
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*/
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export interface FileMetadata {
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// Path information
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sourcePath: string; // Full path: /files/media1/Movies/...
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originalPath: string; // Relative path from meta-sort: media1/Movies/...
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// File stats
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size: number;
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mtime: number;
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ctime: number;
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// Identification
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hashId?: string; // midhash256 hash ID
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// Title information (for folder organization)
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title?: string;
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titles?: { eng?: string; [key: string]: string | undefined };
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originalTitle?: string;
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fileName?: string;
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// Series metadata
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season?: number;
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episode?: number;
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extra?: boolean;
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// Movie metadata
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movieYear?: number;
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year?: number;
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// File type
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fileType?: string; // 'video', 'subtitle', 'torrent', etc.
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extension?: string;
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// Version/variant info
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version?: string;
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subtitleLanguage?: string;
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// Generic metadata container
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[key: string]: unknown;
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}
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export interface RedisClientConfig {
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url?: string;
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prefix?: string;
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filesVolume?: string;
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reconnectInterval?: number;
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}
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export class RedisClient implements Partial<IKVClient> {
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private client: Redis | null = null;
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private subscriber: Redis | null = null;
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private config: Required<RedisClientConfig>;
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private isConnected = false;
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private reconnectTimer: NodeJS.Timeout | null = null;
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private subscriptions: Map<string, (message: string) => void> = new Map();
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// Stream consumer state
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private streamConsumerRunning = false;
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private streamConsumerAbort: AbortController | null = null;
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private consumerName: string;
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constructor(config: RedisClientConfig = {}) {
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this.config = {
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url: config.url ?? process.env.REDIS_URL ?? 'redis://127.0.0.1:6379',
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prefix: config.prefix ?? process.env.REDIS_PREFIX ?? '',
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filesVolume: config.filesVolume ?? process.env.FILES_VOLUME ?? '/files',
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reconnectInterval: config.reconnectInterval ?? 5000,
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};
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// Unique consumer name for this instance
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this.consumerName = `${os.hostname()}-${process.pid}`;
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}
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/**
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* Connect to Redis
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*/
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async connect(): Promise<void> {
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if (this.client && this.isConnected) {
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return;
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}
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try {
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this.client = new Redis(this.config.url, {
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retryStrategy: (times: number) => {
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if (times > 10) {
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logger.warn('Max reconnection attempts reached');
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return null;
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}
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return Math.min(times * 500, 5000);
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},
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maxRetriesPerRequest: 3,
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});
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this.client.on('connect', () => {
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logger.info('Connected to Redis');
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this.isConnected = true;
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});
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this.client.on('error', (err: Error) => {
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logger.error('Redis error:', err.message);
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this.isConnected = false;
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});
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this.client.on('close', () => {
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logger.warn('Redis connection closed');
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this.isConnected = false;
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this.scheduleReconnect();
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});
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// Wait for connection
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await new Promise<void>((resolve, reject) => {
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const timeout = setTimeout(() => {
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reject(new Error('Redis connection timeout'));
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}, 10000);
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this.client!.once('ready', () => {
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clearTimeout(timeout);
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this.isConnected = true;
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resolve();
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});
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this.client!.once('error', (err: Error) => {
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clearTimeout(timeout);
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reject(err);
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});
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});
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} catch (error) {
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logger.error('Failed to connect to Redis:', error);
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this.scheduleReconnect();
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throw error;
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}
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}
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/**
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* Schedule reconnection attempt
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*/
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private scheduleReconnect(): void {
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if (this.reconnectTimer) {
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return;
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}
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this.reconnectTimer = setTimeout(async () => {
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this.reconnectTimer = null;
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try {
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await this.connect();
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} catch {
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// Will retry via scheduleReconnect
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}
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}, this.config.reconnectInterval);
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}
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/**
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* Disconnect from Redis
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*/
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async disconnect(): Promise<void> {
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// Stop stream consumer first
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this.stopStreamConsumer();
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if (this.reconnectTimer) {
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clearTimeout(this.reconnectTimer);
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this.reconnectTimer = null;
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}
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if (this.subscriber) {
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await this.subscriber.quit();
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this.subscriber = null;
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}
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if (this.client) {
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await this.client.quit();
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this.client = null;
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this.isConnected = false;
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}
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this.subscriptions.clear();
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}
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/**
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* Check if connected
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*/
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get connected(): boolean {
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return this.isConnected;
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}
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/**
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* Get all file metadata from Redis
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*/
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async getAllFiles(): Promise<Map<string, FileMetadata>> {
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const files = new Map<string, FileMetadata>();
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if (!this.client || !this.isConnected) {
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logger.warn('Redis not connected, returning empty file list');
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return files;
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}
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try {
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// Get all file keys using the index
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const indexKey = `${this.config.prefix}file:__index__`;
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const hashIds = await this.client.smembers(indexKey);
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if (hashIds.length === 0) {
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// Fallback: scan for file keys directly
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const pattern = `${this.config.prefix}file:*`;
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const keys = await this.scanKeys(pattern);
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logger.debug(`Found ${keys.length} file keys in Redis (via scan)`);
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for (const key of keys) {
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if (key.includes('__index__')) continue;
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try {
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const data = await this.client.hgetall(key);
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if (data && Object.keys(data).length > 0) {
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const hashId = key.replace(`${this.config.prefix}file:`, '');
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const metadata = this.parseMetadata(data, hashId);
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files.set(metadata.sourcePath, metadata);
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}
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} catch (err) {
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logger.warn(`Failed to get metadata for key ${key}:`, err);
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}
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}
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} else {
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logger.debug(`Found ${hashIds.length} files in index`);
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// Fetch metadata for each hash ID
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for (const hashId of hashIds) {
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try {
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const key = `${this.config.prefix}file:${hashId}`;
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const data = await this.client.hgetall(key);
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if (data && Object.keys(data).length > 0) {
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const metadata = this.parseMetadata(data, hashId);
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files.set(metadata.sourcePath, metadata);
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}
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} catch (err) {
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logger.warn(`Failed to get metadata for hashId ${hashId}:`, err);
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}
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}
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}
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logger.info(`Loaded ${files.size} files from Redis`);
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} catch (error) {
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logger.error('Failed to get files from Redis:', error);
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}
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return files;
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}
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/**
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* Get file metadata by hash ID
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*/
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async getFileByHashId(hashId: string): Promise<FileMetadata | null> {
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if (!this.client || !this.isConnected) {
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return null;
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}
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try {
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const key = `${this.config.prefix}file:${hashId}`;
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const data = await this.client.hgetall(key);
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if (data && Object.keys(data).length > 0) {
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return this.parseMetadata(data, hashId);
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}
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return null;
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} catch (error) {
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logger.error(`Failed to get file ${hashId}:`, error);
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return null;
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}
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}
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/**
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* Get all hash IDs from Redis index
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*/
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async getAllHashIds(): Promise<string[]> {
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if (!this.client || !this.isConnected) {
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return [];
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}
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try {
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const indexKey = `${this.config.prefix}file:__index__`;
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return await this.client.smembers(indexKey);
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} catch (error) {
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logger.error('Failed to get hash IDs:', error);
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return [];
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}
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}
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/**
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* Scan Redis keys matching pattern
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*/
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private async scanKeys(pattern: string): Promise<string[]> {
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if (!this.client) return [];
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const keys: string[] = [];
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let cursor = '0';
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do {
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const [newCursor, batch] = await this.client.scan(cursor, 'MATCH', pattern, 'COUNT', 1000);
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cursor = newCursor;
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keys.push(...batch);
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} while (cursor !== '0');
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return keys;
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}
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/**
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* Parse metadata from Redis hash
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* Handles meta-sort format and resolves paths with FILES_VOLUME
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*/
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private parseMetadata(data: Record<string, string>, hashId?: string): FileMetadata {
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// Get the original path (relative to FILES_VOLUME)
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const originalPath = data.filePath ?? data.sourcePath ?? '';
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// Resolve full source path by prepending FILES_VOLUME
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let sourcePath = originalPath;
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if (originalPath && !originalPath.startsWith('/')) {
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// Relative path - prepend FILES_VOLUME
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sourcePath = `${this.config.filesVolume}/${originalPath}`;
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} else if (!originalPath.startsWith(this.config.filesVolume) && originalPath.startsWith('/')) {
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// Absolute path but not in FILES_VOLUME - still prepend
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sourcePath = `${this.config.filesVolume}${originalPath}`;
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}
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// Parse size
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const size = parseInt(data.fileSize ?? data.size ?? data.sizeByte ?? '0', 10);
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// Parse timestamps
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let mtime = 0;
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if (data.mtime) {
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const parsed = Date.parse(data.mtime);
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mtime = isNaN(parsed) ? parseFloat(data.mtime) : parsed;
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}
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// Parse titles - can be nested object or simple string
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let titles: { eng?: string; [key: string]: string | undefined } | undefined;
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if (data['titles/eng']) {
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titles = { eng: data['titles/eng'] };
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}
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// Parse season/episode (can be 0 for specials)
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const season = data.season !== undefined ? parseInt(data.season, 10) : undefined;
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const episode = data.episode !== undefined ? parseInt(data.episode, 10) : undefined;
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// Parse year
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const movieYear = data.movieYear ? parseInt(data.movieYear, 10) : undefined;
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const year = data.year ? parseInt(data.year, 10) : movieYear;
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return {
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// Path information
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sourcePath,
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originalPath,
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// File stats
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size,
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mtime,
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ctime: data.ctime ? parseFloat(data.ctime) : mtime,
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// Identification
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hashId: hashId ?? data.cid_midhash256 ?? data.hashId,
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// Title information
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title: data.title,
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titles,
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originalTitle: data.originalTitle,
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fileName: data.fileName,
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// Series metadata
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season,
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episode,
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extra: data.extra === 'true',
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// Movie metadata
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movieYear,
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year,
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// File type
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fileType: data.fileType,
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extension: data.extension,
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// Version/variant
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version: data.version,
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subtitleLanguage: data.subtitleLanguage,
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};
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}
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/**
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* Subscribe to Redis pub/sub channel
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*/
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async subscribe(channel: string, callback: (message: string) => void): Promise<void> {
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if (!this.client) {
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throw new Error('Redis not connected');
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}
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// Create subscriber connection if not exists
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if (!this.subscriber) {
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this.subscriber = this.client.duplicate();
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await new Promise<void>((resolve, reject) => {
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const timeout = setTimeout(() => reject(new Error('Subscriber connection timeout')), 10000);
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this.subscriber!.once('ready', () => {
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clearTimeout(timeout);
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resolve();
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});
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this.subscriber!.once('error', (err) => {
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clearTimeout(timeout);
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reject(err);
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});
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});
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// Set up message handler
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this.subscriber.on('message', (ch: string, message: string) => {
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const handler = this.subscriptions.get(ch);
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if (handler) {
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try {
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handler(message);
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} catch (error: any) {
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logger.error(`Error in subscription handler for ${ch}:`, error.message);
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}
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}
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});
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}
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// Store callback and subscribe
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this.subscriptions.set(channel, callback);
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await this.subscriber.subscribe(channel);
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logger.info(`Subscribed to channel: ${channel}`);
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}
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/**
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* Unsubscribe from Redis pub/sub channel
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*/
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async unsubscribe(channel: string): Promise<void> {
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if (this.subscriber) {
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await this.subscriber.unsubscribe(channel);
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this.subscriptions.delete(channel);
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logger.info(`Unsubscribed from channel: ${channel}`);
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}
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}
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// ========================================================================
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// Redis Streams Consumer Methods
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// ========================================================================
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/**
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* Initialize stream consumer group
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* Creates the consumer group at position 0 to read all historical events
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*
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* @param stream - Stream name (e.g., 'meta-sort:events')
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* @param group - Consumer group name (e.g., 'meta-fuse-vfs')
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*/
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async initStreamConsumer(stream: string, group: string): Promise<void> {
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if (!this.client) {
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throw new Error('Redis not connected');
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}
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try {
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// Create consumer group at position 0 (read all historical events)
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// MKSTREAM creates the stream if it doesn't exist
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await this.client.xgroup('CREATE', stream, group, '0', 'MKSTREAM');
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logger.info(`Created consumer group '${group}' for stream '${stream}'`);
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} catch (error: any) {
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// BUSYGROUP means group already exists - that's fine
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if (error.message?.includes('BUSYGROUP')) {
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logger.debug(`Consumer group '${group}' already exists`);
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} else {
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throw error;
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}
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}
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}
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/**
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* Process pending entries from crashed consumers
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* Uses XAUTOCLAIM to claim entries that have been idle too long
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*
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* @param stream - Stream name
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* @param group - Consumer group name
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* @param minIdleTime - Minimum idle time in ms before claiming (default: 30000)
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* @param onMessage - Handler for each message
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*/
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async processPendingEntries(
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stream: string,
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group: string,
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minIdleTime: number = 30000,
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onMessage: StreamMessageHandler
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): Promise<number> {
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if (!this.client) {
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return 0;
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}
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let processed = 0;
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let cursor = '0-0';
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try {
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while (true) {
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// XAUTOCLAIM claims idle entries and returns them
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const result = await this.client.xautoclaim(
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stream,
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group,
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this.consumerName,
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minIdleTime,
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cursor,
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'COUNT',
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100
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) as [string, Array<[string, string[]]>, string[]];
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const [nextCursor, entries] = result;
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cursor = nextCursor;
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if (!entries || entries.length === 0) {
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break;
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}
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for (const [id, fields] of entries) {
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try {
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const message = this.parseStreamEntry(id, fields);
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if (message) {
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await onMessage(message);
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// ACK the message after successful processing
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await this.client.xack(stream, group, id);
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processed++;
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}
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} catch (error: any) {
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logger.error(`Error processing pending entry ${id}:`, error.message);
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}
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}
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// If cursor is 0-0, we've processed all pending entries
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if (cursor === '0-0') {
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break;
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}
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}
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if (processed > 0) {
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logger.info(`Processed ${processed} pending stream entries`);
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}
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} catch (error: any) {
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logger.error('Error processing pending entries:', error.message);
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}
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return processed;
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}
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/**
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* Start stream consumer loop
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* Reads messages using XREADGROUP and calls the handler
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*
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* @param stream - Stream name
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* @param group - Consumer group name
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* @param onMessage - Handler for each message
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* @param blockMs - Block timeout in ms (default: 5000)
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*/
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async startStreamConsumer(
|
|
stream: string,
|
|
group: string,
|
|
onMessage: StreamMessageHandler,
|
|
blockMs: number = 5000
|
|
): Promise<void> {
|
|
if (!this.client) {
|
|
throw new Error('Redis not connected');
|
|
}
|
|
|
|
if (this.streamConsumerRunning) {
|
|
logger.warn('Stream consumer already running');
|
|
return;
|
|
}
|
|
|
|
this.streamConsumerRunning = true;
|
|
this.streamConsumerAbort = new AbortController();
|
|
|
|
logger.info(`Starting stream consumer: ${stream} (group: ${group}, consumer: ${this.consumerName})`);
|
|
|
|
// Consumer loop
|
|
while (this.streamConsumerRunning && !this.streamConsumerAbort.signal.aborted) {
|
|
try {
|
|
// XREADGROUP blocks waiting for new messages
|
|
// '>' means only read new messages (not already delivered to this consumer)
|
|
// Use call() to bypass TypeScript's strict argument checking for xreadgroup
|
|
const result = await (this.client.call(
|
|
'XREADGROUP',
|
|
'GROUP', group,
|
|
this.consumerName,
|
|
'BLOCK', blockMs,
|
|
'COUNT', 10,
|
|
'STREAMS', stream,
|
|
'>'
|
|
) as Promise<Array<[string, Array<[string, string[]]>]> | null>);
|
|
|
|
if (!result || result.length === 0) {
|
|
continue; // Timeout, loop again
|
|
}
|
|
|
|
// Process each stream's messages
|
|
for (const [streamName, entries] of result) {
|
|
for (const [id, fields] of entries) {
|
|
try {
|
|
const message = this.parseStreamEntry(id, fields);
|
|
if (message) {
|
|
await onMessage(message);
|
|
// ACK the message after successful processing
|
|
await this.client!.xack(stream, group, id);
|
|
}
|
|
} catch (error: any) {
|
|
logger.error(`Error processing stream entry ${id}:`, error.message);
|
|
// Don't ACK on error - message will be reprocessed
|
|
}
|
|
}
|
|
}
|
|
} catch (error: any) {
|
|
if (this.streamConsumerAbort?.signal.aborted) {
|
|
break;
|
|
}
|
|
logger.error('Stream consumer error:', error.message);
|
|
// Brief pause before retrying
|
|
await new Promise(resolve => setTimeout(resolve, 1000));
|
|
}
|
|
}
|
|
|
|
logger.info('Stream consumer stopped');
|
|
}
|
|
|
|
/**
|
|
* Stop the stream consumer loop
|
|
*/
|
|
stopStreamConsumer(): void {
|
|
if (!this.streamConsumerRunning) {
|
|
return;
|
|
}
|
|
|
|
logger.info('Stopping stream consumer...');
|
|
this.streamConsumerRunning = false;
|
|
this.streamConsumerAbort?.abort();
|
|
this.streamConsumerAbort = null;
|
|
}
|
|
|
|
/**
|
|
* Parse a stream entry into a StreamMessage
|
|
*/
|
|
private parseStreamEntry(id: string, fields: string[]): StreamMessage | null {
|
|
// Fields come as flat array: ['type', 'batch', 'payload', '...', 'timestamp', '123']
|
|
const fieldMap: Record<string, string> = {};
|
|
for (let i = 0; i < fields.length; i += 2) {
|
|
fieldMap[fields[i]] = fields[i + 1];
|
|
}
|
|
|
|
if (!fieldMap.type || !fieldMap.payload) {
|
|
logger.warn(`Invalid stream entry ${id}: missing type or payload`);
|
|
return null;
|
|
}
|
|
|
|
return {
|
|
id,
|
|
type: fieldMap.type as StreamMessage['type'],
|
|
payload: fieldMap.payload,
|
|
timestamp: fieldMap.timestamp || '0',
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Get stats about Redis data
|
|
*/
|
|
async getStats(): Promise<{ totalKeys: number; fileCount: number; connected: boolean }> {
|
|
if (!this.client || !this.isConnected) {
|
|
return { totalKeys: 0, fileCount: 0, connected: false };
|
|
}
|
|
|
|
try {
|
|
// Try index first
|
|
const indexKey = `${this.config.prefix}file:__index__`;
|
|
const count = await this.client.scard(indexKey);
|
|
|
|
if (count > 0) {
|
|
return {
|
|
totalKeys: count,
|
|
fileCount: count,
|
|
connected: true,
|
|
};
|
|
}
|
|
|
|
// Fallback to scanning
|
|
const filePattern = `${this.config.prefix}file:*`;
|
|
const fileKeys = await this.scanKeys(filePattern);
|
|
const actualFileKeys = fileKeys.filter(k => !k.includes('__index__'));
|
|
|
|
return {
|
|
totalKeys: actualFileKeys.length,
|
|
fileCount: actualFileKeys.length,
|
|
connected: true,
|
|
};
|
|
} catch {
|
|
return { totalKeys: 0, fileCount: 0, connected: false };
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Health check
|
|
*/
|
|
async health(): Promise<boolean> {
|
|
if (!this.client || !this.isConnected) {
|
|
return false;
|
|
}
|
|
|
|
try {
|
|
const result = await this.client.ping();
|
|
return result === 'PONG';
|
|
} catch {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Close connections
|
|
*/
|
|
async close(): Promise<void> {
|
|
await this.disconnect();
|
|
}
|
|
|
|
/**
|
|
* Get the raw ioredis client for direct access if needed
|
|
* Use with caution - prefer using the typed methods above
|
|
*/
|
|
getRawClient(): Redis | null {
|
|
return this.client;
|
|
}
|
|
}
|