expensive background process

package.json

@@ -42,6 +42,7 @@
     "@material-ui/icons": "^4.9.1",
     "@reach/router": "^1.3.4",
     "@types/react-router-dom": "^5.1.6",
+    "crypto": "^1.0.1",
     "graphql": "^15.3.0",
     "react": "^16.14.0",
     "react-dom": "^16.14.0",

server/src/background-process.ts

@@ -1,3 +1,4 @@
+import { createHash } from 'crypto'
 import { getRepository } from 'typeorm'
 import { Party } from './entities/Party'
 
@@ -9,3 +10,9 @@ export async function deleteOldParties() {
     .where('TIMESTAMPDIFF(HOUR, latestTime, CURRENT_TIMESTAMP()) > 24')
     .execute()
 }
+
+// An expensive hash function to see how it affects performance. Copied from class slides.
+export function expensiveFunction() {
+  const data = 'hash-me'
+  createHash('sha256').update(data).digest('base64')
+}

server/src/config.ts

@@ -25,5 +25,5 @@ export const Config = {
   backgroundService: isServiceEnabled(AppService.BACKGROUND) ? true : !isProd(),
   wsUrl: process.env.WS_URL || 'ws://localhost:3000/graphqlsubscription',
   adminPassword: process.env.ADMIN_PASSWORD || 'password',
-  backgroundProcessInterval: 86400000, // In milliseconds.
+  backgroundProcessInterval: 100, // In milliseconds.
 }

server/src/server.ts

@@ -16,7 +16,7 @@ import { forAwaitEach, isAsyncIterable } from 'iterall'
 import path from 'path'
 import 'reflect-metadata'
 import { checkEqual, Unpromise } from '../../common/src/util'
-import { deleteOldParties } from './background-process'
+import { expensiveFunction } from './background-process'
 import { Config } from './config'
 import { migrate } from './db/migrate'
 import { initORM } from './db/sql'
@@ -189,7 +189,6 @@ initORM()
   .catch(err => console.error(err))
 
 setInterval(() => {
-  deleteOldParties()
-    .then(() => console.log('Background process run succesfully.'))
-    .catch(err => console.error(err))
+  expensiveFunction()
+  console.log('Background process run succesfully.')
 }, Config.backgroundProcessInterval)