improve(db): do not use keys in redis

Author: lindesvard

apps/api/src/controllers/live.controller.ts

@@ -76,7 +76,7 @@ export function wsVisitors(
   const { params } = req;
 
   getRedisSub().subscribe('event:received');
-  getRedisSub().psubscribe('__key*:expired');
+  getRedisSub().psubscribe('__keyevent@0__:expired');
 
   const message = (channel: string, message: string) => {
     if (channel === 'event:received') {
@@ -89,6 +89,10 @@ export function wsVisitors(
     }
   };
   const pmessage = (pattern: string, channel: string, message: string) => {
+    if (!message.startsWith('live:visitors:')) {
+      return null;
+    }
+
     const [projectId] = getLiveEventInfo(message);
     if (projectId && projectId === params.projectId) {
       getLiveVisitors(params.projectId).then((count) => {
@@ -102,7 +106,7 @@ export function wsVisitors(
 
   connection.socket.on('close', () => {
     getRedisSub().unsubscribe('event:saved');
-    getRedisSub().punsubscribe('__key*:expired');
+    getRedisSub().punsubscribe('__keyevent@0__:expired');
     getRedisSub().off('message', message);
     getRedisSub().off('pmessage', pmessage);
   });

packages/db/src/buffers/event-buffer-redis.ts

@@ -246,12 +246,8 @@ return "OK"
       }
 
       if (event.profile_id) {
-        multi.set(
-          `live:event:${event.project_id}:${event.profile_id}`,
-          '',
-          'EX',
-          60 * 5,
-        );
+        multi.sadd(`live:visitors:${event.project_id}`, event.profile_id);
+        multi.expire(`live:visitors:${event.project_id}`, 60 * 5); // 5 minutes
       }
 
       if (!_multi) {

packages/db/src/services/event.service.ts

@@ -235,8 +235,7 @@ export function transformMinimalEvent(
 }
 
 export async function getLiveVisitors(projectId: string) {
-  const keys = await getRedisCache().keys(`live:event:${projectId}:*`);
-  return keys.length;
+  return getRedisCache().scard(`live:visitors:${projectId}`);
 }
 
 export async function getEvents(