Windsurf
realtime
User Presence Showing Wrong Online/Offline Status in Windsurf App
The user presence system in your Windsurf-generated app shows incorrect online/offline status. Users who closed the app hours ago still appear as online, users who are actively using the app show as offline, or presence status flickers between online and offline rapidly.
Presence tracking is crucial for chat apps, collaborative tools, and social features. When it's unreliable, users send messages to people who aren't there, miss that collaborators are available, or lose trust in the application's real-time features.
The issue often manifests differently across browsers and devices — a user may appear online in their own browser but offline to everyone else, or vice versa. Mobile users are particularly affected because their connections are frequently interrupted.
Error Messages You Might See
User shows online but is unreachable
Presence flickers between online and offline
last_seen: 3 hours ago but status: online
Offline event received after new online event
Multiple presence entries for same user
Common Causes
- No heartbeat mechanism — Presence is set to online on connect and offline on disconnect, but disconnection events are unreliable and can be missed
- Stale presence data — The presence status is stored in the database but never expires, so users who disconnect abnormally stay online forever
- Tab/window handling — Opening multiple tabs creates multiple connections, and closing one tab sets the user offline even though other tabs are open
- Network interruption not detected — Mobile connections drop frequently but the server doesn't detect the disconnection for minutes due to TCP keepalive delays
- Race conditions on connect/disconnect — When a user reconnects quickly, the offline event from the old connection arrives after the online event from the new connection
How to Fix It
- Implement heartbeat-based presence — Send a heartbeat from the client every 15-30 seconds. On the server, mark users as offline if no heartbeat is received for 2x the interval
- Use Redis with TTL for presence — Store presence in Redis with a 60-second TTL. Each heartbeat refreshes the TTL. When the TTL expires, the user is automatically offline
- Handle multiple tabs/windows — Track connection count per user. Only set offline when the count reaches zero. Increment on connect, decrement on disconnect
- Add last_seen timestamp — Instead of binary online/offline, store a last_seen timestamp and consider users online if seen within the last 60 seconds
- Debounce status changes — When a user goes offline, wait 5-10 seconds before broadcasting the offline status. If they reconnect in that window, cancel the offline broadcast
- Broadcast presence updates efficiently — Use Socket.io rooms or pub/sub to only notify users who are viewing the presence indicator, not all connected users
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Get HelpFrequently Asked Questions
How often should presence heartbeats be sent?
Every 15-30 seconds is typical. Shorter intervals detect disconnections faster but increase server load. Set the offline threshold to 2x the heartbeat interval (e.g., heartbeat every 20s, offline after 40s of no heartbeat).
Should I store presence in the database or Redis?
Use Redis. Presence data changes constantly and needs TTL-based expiration. Storing it in your main database creates unnecessary write load. Redis keys with TTL naturally expire, handling abnormal disconnections automatically.