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1 | import * as express from 'express' | |
2 | import * as AsyncLock from 'async-lock' | |
3 | import { parseDuration } from '../helpers/utils' | |
4 | import { Redis } from '../lib/redis' | |
5 | import { logger } from '../helpers/logger' | |
6 | ||
7 | const lock = new AsyncLock({ timeout: 5000 }) | |
8 | ||
9 | function cacheRoute (lifetime: number) { | |
10 | return async function (req: express.Request, res: express.Response, next: express.NextFunction) { | |
11 | const redisKey = Redis.Instance.buildCachedRouteKey(req) | |
12 | ||
13 | await lock.acquire(redisKey, async (done) => { | |
14 | const cached = await Redis.Instance.getCachedRoute(req) | |
15 | ||
16 | // Not cached | |
17 | if (!cached) { | |
18 | logger.debug('No cached results for route %s.', req.originalUrl) | |
19 | ||
20 | const sendSave = res.send.bind(res) | |
21 | ||
22 | res.send = (body) => { | |
23 | if (res.statusCode >= 200 && res.statusCode < 400) { | |
24 | const contentType = res.get('content-type') | |
25 | Redis.Instance.setCachedRoute(req, body, lifetime, contentType, res.statusCode) | |
26 | .then(() => done()) | |
27 | .catch(err => { | |
28 | logger.error('Cannot cache route.', { err }) | |
29 | return done(err) | |
30 | }) | |
31 | } | |
32 | ||
33 | return sendSave(body) | |
34 | } | |
35 | ||
36 | return next() | |
37 | } | |
38 | ||
39 | if (cached.contentType) res.set('content-type', cached.contentType) | |
40 | ||
41 | if (cached.statusCode) { | |
42 | const statusCode = parseInt(cached.statusCode, 10) | |
43 | if (!isNaN(statusCode)) res.status(statusCode) | |
44 | } | |
45 | ||
46 | logger.debug('Use cached result for %s.', req.originalUrl) | |
47 | res.send(cached.body).end() | |
48 | ||
49 | return done() | |
50 | }) | |
51 | } | |
52 | } | |
53 | ||
54 | const cache = (duration: number | string) => { | |
55 | const _lifetime = parseDuration(duration, 3600000) | |
56 | return cacheRoute(_lifetime) | |
57 | } | |
58 | ||
59 | // --------------------------------------------------------------------------- | |
60 | ||
61 | export { | |
62 | cacheRoute, | |
63 | cache | |
64 | } |