1
0
Fork 0
peertube/server/middlewares/cache.ts

75 lines
2.1 KiB
TypeScript
Raw Normal View History

2018-04-17 08:01:06 -04:00
import * as express from 'express'
import * as AsyncLock from 'async-lock'
2018-08-14 09:28:30 -04:00
import { parseDuration } from '../helpers/core-utils'
2018-04-17 08:01:06 -04:00
import { Redis } from '../lib/redis'
import { logger } from '../helpers/logger'
const lock = new AsyncLock({ timeout: 5000 })
2018-07-24 08:35:11 -04:00
function cacheRoute (lifetimeArg: string | number) {
2018-05-11 03:44:04 -04:00
return async function (req: express.Request, res: express.Response, next: express.NextFunction) {
2018-10-05 05:15:06 -04:00
const redisKey = Redis.Instance.generateCachedRouteKey(req)
2018-07-24 08:35:11 -04:00
try {
await lock.acquire(redisKey, async (done) => {
const cached = await Redis.Instance.getCachedRoute(req)
2018-04-17 08:01:06 -04:00
2018-07-24 08:35:11 -04:00
// Not cached
if (!cached) {
logger.debug('No cached results for route %s.', req.originalUrl)
2018-04-17 08:01:06 -04:00
2018-07-24 08:35:11 -04:00
const sendSave = res.send.bind(res)
2018-11-16 05:18:13 -05:00
const redirectSave = res.redirect.bind(res)
2018-04-17 08:01:06 -04:00
2018-07-24 08:35:11 -04:00
res.send = (body) => {
if (res.statusCode >= 200 && res.statusCode < 400) {
const contentType = res.get('content-type')
const lifetime = parseDuration(lifetimeArg)
Redis.Instance.setCachedRoute(req, body, lifetime, contentType, res.statusCode)
.then(() => done())
.catch(err => {
logger.error('Cannot cache route.', { err })
return done(err)
})
} else {
done()
2018-07-24 08:35:11 -04:00
}
return sendSave(body)
}
2018-11-16 05:18:13 -05:00
res.redirect = url => {
done()
return redirectSave(url)
}
2018-07-24 08:35:11 -04:00
return next()
2018-05-11 03:44:04 -04:00
}
2018-07-24 08:35:11 -04:00
if (cached.contentType) res.set('content-type', cached.contentType)
2018-04-17 08:01:06 -04:00
2018-07-24 08:35:11 -04:00
if (cached.statusCode) {
const statusCode = parseInt(cached.statusCode, 10)
if (!isNaN(statusCode)) res.status(statusCode)
}
2018-04-17 08:01:06 -04:00
2018-07-24 08:35:11 -04:00
logger.debug('Use cached result for %s.', req.originalUrl)
res.send(cached.body).end()
2018-04-17 08:01:06 -04:00
2018-07-24 08:35:11 -04:00
return done()
})
} catch (err) {
logger.error('Cannot serve cached route.', { err })
2018-07-24 08:35:11 -04:00
return next()
}
2018-04-17 08:01:06 -04:00
}
}
// ---------------------------------------------------------------------------
export {
2018-07-24 08:35:11 -04:00
cacheRoute
2018-04-17 08:01:06 -04:00
}