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1 | import * as express from 'express' | |
2 | import { Redis } from '../lib/redis' | |
3 | import { logger } from '../helpers/logger' | |
4 | ||
5 | function cacheRoute (lifetime: number) { | |
6 | return async function (req: express.Request, res: express.Response, next: express.NextFunction) { | |
7 | const cached = await Redis.Instance.getCachedRoute(req) | |
8 | ||
9 | // Not cached | |
10 | if (!cached) { | |
11 | logger.debug('Not cached result for route %s.', req.originalUrl) | |
12 | ||
13 | const sendSave = res.send.bind(res) | |
14 | ||
15 | res.send = (body) => { | |
16 | if (res.statusCode >= 200 && res.statusCode < 400) { | |
17 | const contentType = res.getHeader('content-type').toString() | |
18 | Redis.Instance.setCachedRoute(req, body, lifetime, contentType, res.statusCode) | |
19 | .catch(err => logger.error('Cannot cache route.', { err })) | |
20 | } | |
21 | ||
22 | return sendSave(body) | |
23 | } | |
24 | ||
25 | return next() | |
26 | } | |
27 | ||
28 | if (cached.contentType) res.contentType(cached.contentType) | |
29 | ||
30 | if (cached.statusCode) { | |
31 | const statusCode = parseInt(cached.statusCode, 10) | |
32 | if (!isNaN(statusCode)) res.status(statusCode) | |
33 | } | |
34 | ||
35 | logger.debug('Use cached result for %s.', req.originalUrl) | |
36 | return res.send(cached.body).end() | |
37 | } | |
38 | } | |
39 | ||
40 | // --------------------------------------------------------------------------- | |
41 | ||
42 | export { | |
43 | cacheRoute | |
44 | } |