From fd4484f19eae8b0a0c30d5d30e98880c8708516a Mon Sep 17 00:00:00 2001
From: Chocobozzz <me@florianbigard.com>
Date: Fri, 11 May 2018 09:44:04 +0200
Subject: Cache AP video route for 5 seconds

---
 server/middlewares/cache.ts | 43 +++++++++++++++++++++++--------------------
 1 file changed, 23 insertions(+), 20 deletions(-)

(limited to 'server/middlewares/cache.ts')

diff --git a/server/middlewares/cache.ts b/server/middlewares/cache.ts
index a2c7f7cbd..c589ef683 100644
--- a/server/middlewares/cache.ts
+++ b/server/middlewares/cache.ts
@@ -2,36 +2,39 @@ import * as express from 'express'
 import { Redis } from '../lib/redis'
 import { logger } from '../helpers/logger'
 
-async function cacheRoute (req: express.Request, res: express.Response, next: express.NextFunction) {
-  const cached = await Redis.Instance.getCachedRoute(req)
+function cacheRoute (lifetime: number) {
+  return async function (req: express.Request, res: express.Response, next: express.NextFunction) {
+    const cached = await Redis.Instance.getCachedRoute(req)
 
-  // Not cached
-  if (!cached) {
-    logger.debug('Not cached result for route %s.', req.originalUrl)
+    // Not cached
+    if (!cached) {
+      logger.debug('Not cached result for route %s.', req.originalUrl)
 
-    const sendSave = res.send.bind(res)
+      const sendSave = res.send.bind(res)
 
-    res.send = (body) => {
-      if (res.statusCode >= 200 && res.statusCode < 400) {
-        Redis.Instance.setCachedRoute(req, body, res.getHeader('content-type').toString(), res.statusCode)
-             .catch(err => logger.error('Cannot cache route.', { err }))
+      res.send = (body) => {
+        if (res.statusCode >= 200 && res.statusCode < 400) {
+          const contentType = res.getHeader('content-type').toString()
+          Redis.Instance.setCachedRoute(req, body, lifetime, contentType, res.statusCode)
+               .catch(err => logger.error('Cannot cache route.', { err }))
+        }
+
+        return sendSave(body)
       }
 
-      return sendSave(body)
+      return next()
     }
 
-    return next()
-  }
+    if (cached.contentType) res.contentType(cached.contentType)
 
-  if (cached.contentType) res.contentType(cached.contentType)
+    if (cached.statusCode) {
+      const statusCode = parseInt(cached.statusCode, 10)
+      if (!isNaN(statusCode)) res.status(statusCode)
+    }
 
-  if (cached.statusCode) {
-    const statusCode = parseInt(cached.statusCode, 10)
-    if (!isNaN(statusCode)) res.status(statusCode)
+    logger.debug('Use cached result for %s.', req.originalUrl)
+    return res.send(cached.body).end()
   }
-
-  logger.debug('Use cached result for %s.', req.originalUrl)
-  return res.send(cached.body).end()
 }
 
 // ---------------------------------------------------------------------------
-- 
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