@directus/api/dist/middleware/cache.js

Directus is a real-time API and App dashboard for managing SQL database content

import { useEnv } from '@directus/env';
import { getCache, getCacheValue } from '../cache.js';
import { useLogger } from '../logger/index.js';
import asyncHandler from '../utils/async-handler.js';
import { getCacheControlHeader } from '../utils/get-cache-headers.js';
import { getCacheKey } from '../utils/get-cache-key.js';
import { shouldSkipCache } from '../utils/should-skip-cache.js';
const checkCacheMiddleware = asyncHandler(async (req, res, next) => {
    const env = useEnv();
    const { cache } = getCache();
    const logger = useLogger();
    if (req.method.toLowerCase() !== 'get' && req.originalUrl?.startsWith('/graphql') === false)
        return next();
    if (env['CACHE_ENABLED'] !== true)
        return next();
    if (!cache)
        return next();
    if (shouldSkipCache(req)) {
        if (env['CACHE_STATUS_HEADER'])
            res.setHeader(`${env['CACHE_STATUS_HEADER']}`, 'MISS');
        return next();
    }
    const key = await getCacheKey(req);
    let cachedData;
    try {
        cachedData = await getCacheValue(cache, key);
    }
    catch (err) {
        logger.warn(err, `[cache] Couldn't read key ${key}. ${err.message}`);
        if (env['CACHE_STATUS_HEADER'])
            res.setHeader(`${env['CACHE_STATUS_HEADER']}`, 'MISS');
        return next();
    }
    if (cachedData) {
        let cacheExpiryDate;
        try {
            cacheExpiryDate = (await getCacheValue(cache, `${key}__expires_at`))?.exp;
        }
        catch (err) {
            logger.warn(err, `[cache] Couldn't read key ${`${key}__expires_at`}. ${err.message}`);
            if (env['CACHE_STATUS_HEADER'])
                res.setHeader(`${env['CACHE_STATUS_HEADER']}`, 'MISS');
            return next();
        }
        const cacheTTL = cacheExpiryDate ? cacheExpiryDate - Date.now() : undefined;
        res.setHeader('Cache-Control', getCacheControlHeader(req, cacheTTL, true, true));
        res.setHeader('Vary', 'Origin, Cache-Control');
        if (env['CACHE_STATUS_HEADER'])
            res.setHeader(`${env['CACHE_STATUS_HEADER']}`, 'HIT');
        return res.json(cachedData);
    }
    else {
        if (env['CACHE_STATUS_HEADER'])
            res.setHeader(`${env['CACHE_STATUS_HEADER']}`, 'MISS');
        return next();
    }
});
export default checkCacheMiddleware;