101 lines
7.6 KiB
JavaScript
101 lines
7.6 KiB
JavaScript
import { getCache } from './commons/cache/index.js';
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import { appEvents } from './events.js';
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import pino from 'pino';
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import path from 'path';
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const logFile = path.join(process.cwd(), 'logs', 'cache.json');
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const fileTransport = pino.transport({
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target: 'pino/file',
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options: { destination: logFile, mkdir: true }
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});
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const logger = pino({
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level: process.env.PINO_LOG_LEVEL || 'info',
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base: { product: 'cache' },
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timestamp: pino.stdTimeFunctions.isoTime,
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}, pino.multistream([
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{ stream: fileTransport, level: 'info' }
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]));
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export class AppCache {
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static instance;
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// Dependencies: key -> [dependencies]
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// Defines what each type DEPENDS ON.
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// If 'categories' changes, any type that has 'categories' in its dependency list must be invalidated.
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static DEPENDENCIES = {
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'posts': ['categories', 'pictures'], // posts depend on categories and pictures
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'pages': ['categories', 'pictures', 'translations'],
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'categories': ['types'],
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'translations': [], // widget/category translations (wt:* keys)
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'feed': ['posts', 'pages', 'categories'],
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'auth': [] // No dependencies, standalone
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};
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constructor() { }
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static getInstance() {
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if (!AppCache.instance) {
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AppCache.instance = new AppCache();
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}
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return AppCache.instance;
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}
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async get(type) {
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const cache = getCache();
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const val = await cache.get(type);
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return val;
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}
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async set(type, data, ttl) {
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const cache = getCache();
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await cache.set(type, data, ttl);
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}
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/**
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* Silent cache invalidation — clears cache for the given type and
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* cascades to dependents. Does NOT emit SSE events.
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* Use `notify()` in route handlers for explicit SSE.
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*/
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async invalidate(type) {
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const cache = getCache();
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if (type === 'feed') {
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await cache.flush('*-feed*');
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await cache.flush('home-feed*');
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}
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else if (type === 'translations') {
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await cache.flush('wt:*');
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await cache.flush('page-details-*');
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}
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else {
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await cache.del(type);
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}
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// Find types that depend on this type
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const dependents = Object.keys(AppCache.DEPENDENCIES).filter(key => AppCache.DEPENDENCIES[key].includes(type));
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logger.info({ type, dependents }, 'Cache invalidated');
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if (dependents.length > 0) {
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await Promise.all(dependents.map(dep => this.invalidate(dep)));
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}
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}
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/**
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* Flush cache entries by pattern. Silent — no SSE.
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*/
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async flush(pattern) {
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const cache = getCache();
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await cache.flush(pattern);
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logger.info({ pattern: pattern || 'all' }, 'Cache flushed');
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}
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/**
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* Emit exactly 1 SSE event to notify clients of a change.
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* Call this in route handlers AFTER cache invalidation.
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*
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* @param type - Entity type (e.g. 'post', 'page', 'category', 'picture')
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* @param id - Entity ID (null for list-level / system changes)
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* @param action - The mutation that occurred
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*/
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notify(type, id, action) {
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logger.info({ type, id, action }, 'Cache notify');
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appEvents.emitUpdate(type, action, { id }, 'cache');
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}
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inspect() {
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const cache = getCache();
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return {
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info: cache.info(),
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dependencies: AppCache.DEPENDENCIES,
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entries: cache.entries(),
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};
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}
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}
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export const appCache = AppCache.getInstance();
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