Output cache versioning

.gitignore

@@ -9,6 +9,7 @@ config/local.json
 var
 build/config.json
 core/build/config.json
+core/build/cache-version.json
 theme.js
 desktop.ini
 src/themes/catalog/resource/i18n.json

CHANGELOG.md

@@ -4,6 +4,10 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+### Added
+- cache key used to store output chache in redis
+
 ## [1.7.2] - 2019.01.28
 ### Fixed
 - clear search filters on mobile - @patzick (#2282)

core/build/webpack.server.config.js

@@ -3,6 +3,18 @@ const merge = require('webpack-merge')
 const base = require('./webpack.base.config')
 const VueSSRPlugin = require('vue-ssr-webpack-plugin')
 
+// when output cache is enabled generate cache version key
+const config = require('config')
+const fs = require('fs')
+const path = require('path')
+const uuid = require('uuid/v4')
+if (config.server.useOutputCache) {
+  fs.writeFileSync(
+    path.join(__dirname, 'cache-version.json'),
+    JSON.stringify(uuid())
+  )
+}
+
 module.exports = merge(base, {
   mode: 'development',
   target: 'node',

core/package.json

@@ -18,6 +18,7 @@
     "lru-cache": "^4.0.1",
     "redis-tag-cache": "^1.2.1",
     "remove-accents": "^0.4.2",
+    "uuid": "^3.3.2",
     "vue": "^2.5.17",
     "vue-carousel": "^0.6.9",
     "vue-i18n": "^8.0.0",

core/scripts/server.js

@@ -7,22 +7,28 @@ let config = require('config')
 const TagCache = require('redis-tag-cache').default
 const utils = require('./server/utils')
 const compile = require('lodash.template')
+
 const compileOptions = {
   escape: /{{([^{][\s\S]+?[^}])}}/g,
   interpolate: /{{{([\s\S]+?)}}}/g
 }
+
 const isProd = process.env.NODE_ENV === 'production'
 process.noDeprecation = true
 
 const app = express()
 
 let cache
 if (config.server.useOutputCache) {
+  const cacheKey = JSON.parse(fs.readFileSync(path.join(__dirname, '..', 'build', 'cache-version.json')) || '')
+  const redisConfig = Object.assign(config.redis, { keyPrefix: cacheKey })
+
   cache = new TagCache({
-    redis: config.redis,
-    defaultTimeout: config.server.outputCacheDefaultTtl // Expire records after a day (even if they weren't invalidated)
+    redis: redisConfig,
+    defaultTimeout: config.server.outputCacheDefaultTtl
   })
-  console.log('Redis cache set', config.redis)
+
+  console.log('Redis cache set', redisConfig)
 }
 
 const templatesCache = {}