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Commit | Line | Data |
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4195cd2b | 1 | import * as express from 'express' |
b40f0575 | 2 | import * as AsyncLock from 'async-lock' |
8f0bc73d | 3 | import { parseDurationToMs } from '../helpers/core-utils' |
4195cd2b C |
4 | import { Redis } from '../lib/redis' |
5 | import { logger } from '../helpers/logger' | |
6 | ||
b40f0575 C |
7 | const lock = new AsyncLock({ timeout: 5000 }) |
8 | ||
98d3324d | 9 | function cacheRoute (lifetimeArg: string | number) { |
fd4484f1 | 10 | return async function (req: express.Request, res: express.Response, next: express.NextFunction) { |
6e46de09 | 11 | const redisKey = Redis.Instance.generateCachedRouteKey(req) |
b40f0575 | 12 | |
98d3324d C |
13 | try { |
14 | await lock.acquire(redisKey, async (done) => { | |
15 | const cached = await Redis.Instance.getCachedRoute(req) | |
4195cd2b | 16 | |
98d3324d C |
17 | // Not cached |
18 | if (!cached) { | |
19 | logger.debug('No cached results for route %s.', req.originalUrl) | |
4195cd2b | 20 | |
98d3324d | 21 | const sendSave = res.send.bind(res) |
8d1fa36a | 22 | const redirectSave = res.redirect.bind(res) |
4195cd2b | 23 | |
98d3324d C |
24 | res.send = (body) => { |
25 | if (res.statusCode >= 200 && res.statusCode < 400) { | |
26 | const contentType = res.get('content-type') | |
8f0bc73d | 27 | const lifetime = parseDurationToMs(lifetimeArg) |
98d3324d C |
28 | |
29 | Redis.Instance.setCachedRoute(req, body, lifetime, contentType, res.statusCode) | |
30 | .then(() => done()) | |
31 | .catch(err => { | |
32 | logger.error('Cannot cache route.', { err }) | |
33 | return done(err) | |
34 | }) | |
328e607d C |
35 | } else { |
36 | done() | |
98d3324d C |
37 | } |
38 | ||
39 | return sendSave(body) | |
b40f0575 C |
40 | } |
41 | ||
8d1fa36a C |
42 | res.redirect = url => { |
43 | done() | |
44 | ||
45 | return redirectSave(url) | |
46 | } | |
47 | ||
98d3324d | 48 | return next() |
fd4484f1 C |
49 | } |
50 | ||
98d3324d | 51 | if (cached.contentType) res.set('content-type', cached.contentType) |
4195cd2b | 52 | |
98d3324d C |
53 | if (cached.statusCode) { |
54 | const statusCode = parseInt(cached.statusCode, 10) | |
55 | if (!isNaN(statusCode)) res.status(statusCode) | |
56 | } | |
4195cd2b | 57 | |
98d3324d C |
58 | logger.debug('Use cached result for %s.', req.originalUrl) |
59 | res.send(cached.body).end() | |
4195cd2b | 60 | |
98d3324d C |
61 | return done() |
62 | }) | |
63 | } catch (err) { | |
328e607d | 64 | logger.error('Cannot serve cached route.', { err }) |
98d3324d C |
65 | return next() |
66 | } | |
4195cd2b | 67 | } |
4195cd2b C |
68 | } |
69 | ||
70 | // --------------------------------------------------------------------------- | |
71 | ||
72 | export { | |
98d3324d | 73 | cacheRoute |
4195cd2b | 74 | } |