From f86cdc393336932fb6b46dff3aaafbb9ea740a00 Mon Sep 17 00:00:00 2001
From: Matt <Geczy@users.noreply.github.com>
Date: Thu, 5 Oct 2023 11:32:37 -0500
Subject: [PATCH] self clearing gsihandler caches when user is inactive

---
 packages/dota/src/dota/GSIServer.ts         | 19 +++++++++++++++++++
 packages/dota/src/dota/clearCacheForUser.ts | 19 ++++++++++++++++++-
 2 files changed, 37 insertions(+), 1 deletion(-)

diff --git a/packages/dota/src/dota/GSIServer.ts b/packages/dota/src/dota/GSIServer.ts
index 42a8b08a..0f531026 100644
--- a/packages/dota/src/dota/GSIServer.ts
+++ b/packages/dota/src/dota/GSIServer.ts
@@ -8,6 +8,7 @@ import { newData, processChanges } from './globalEventEmitter.js'
 import { emitMinimapBlockerStatus } from './GSIHandler.js'
 import { gsiHandlers } from './lib/consts.js'
 import { validateToken } from './validateToken.js'
+import { checkForInactiveTokens, tokenLastPostTimestamps } from './clearCacheForUser.js'
 
 function handleSocketAuth(socket: Socket, next: (err?: Error) => void) {
   const { token } = socket.handshake.auth
@@ -63,6 +64,21 @@ class GSIServer {
     app.use(express.urlencoded({ extended: true, limit: '1mb' }))
 
     app.post('/', validateToken, processChanges('previously'), processChanges('added'), newData)
+    app.post(
+      '/',
+      validateToken,
+      (req: Request, res: Response, next: () => void) => {
+        const token = req.body.auth.token as string
+
+        // Update the timestamp for this token
+        tokenLastPostTimestamps.set(token, Date.now())
+
+        next()
+      },
+      processChanges('previously'),
+      processChanges('added'),
+      newData,
+    )
 
     app.get('/', (req: Request, res: Response) => {
       res.status(200).json({ status: 'ok' })
@@ -74,6 +90,9 @@ class GSIServer {
 
     this.io.use(handleSocketAuth)
     this.io.on('connection', handleSocketConnection)
+
+    // Set up the repeating timer
+    setInterval(checkForInactiveTokens, 60 * 1000) // Run every minute
   }
 
   init() {
diff --git a/packages/dota/src/dota/clearCacheForUser.ts b/packages/dota/src/dota/clearCacheForUser.ts
index a65015c7..bfe0028c 100644
--- a/packages/dota/src/dota/clearCacheForUser.ts
+++ b/packages/dota/src/dota/clearCacheForUser.ts
@@ -1,10 +1,25 @@
 import { getAuthProvider } from '../twitch/lib/getAuthProvider.js'
 import { SocketClient } from '../types.js'
+import { logger } from '../utils/logger.js'
 import { deleteRedisData } from './GSIHandler.js'
 import { gsiHandlers, twitchIdToToken } from './lib/consts.js'
 
-// three types of in-memory cache exists
+// This will hold the last POST request timestamp for each token
+export const tokenLastPostTimestamps: Map<string, number> = new Map()
+
+// Function to check for inactive tokens and delete the corresponding gsiHandler
+export async function checkForInactiveTokens() {
+  const now = Date.now()
+  const timeoutMillis = 60 * 1000 // 1 minute
 
+  for (const [token, timestamp] of tokenLastPostTimestamps.entries()) {
+    if (now - timestamp > timeoutMillis) {
+      await clearCacheForUser(gsiHandlers.get(token)?.client)
+    }
+  }
+}
+
+// three types of in-memory cache exists
 export async function clearCacheForUser(client?: SocketClient | null) {
   if (!client) return false
 
@@ -24,5 +39,7 @@ export async function clearCacheForUser(client?: SocketClient | null) {
   await deleteRedisData(client)
 
   gsiHandlers.delete(client.token)
+
+  tokenLastPostTimestamps.delete(client.token)
   return true
 }