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Prevent stale player presence by treating a WebSocket as a temporary connection—not as the player’s identity. Track each connection separately under a stable player or session ID, refresh its liveness with heartbeats, and expire connections that stop refreshing. Cleanup must remove only the connection that closed; a delayed close from an older socket must not mark a player offline after a replacement socket has joined.
Why a player can remain online after a disconnect
A WebSocket close handler is useful, but it cannot be the only cleanup mechanism. If a network disappears abruptly, the server may not receive a clean close event and may continue to treat the connection as active. Microsoft’s ASP.NET Core WebSockets guidance describes this failure mode and recommends timeout-based detection.
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The underlying design issue is that a player’s presence and a WebSocket connection have different lifetimes. A player may reconnect on a new socket, use several tabs or devices, or retain a resumable game session while no socket is currently connected. Model those concepts separately so a lost transport can be cleaned up without erasing the player’s logical session or another active connection.
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Give every socket connection its own unique connection ID, and associate it with a stable authenticated player or session ID. Store the relationship as one player/session to one or more active connection IDs, rather than a single player-to-socket field that a new connection simply overwrites.
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- Player or session ID: identifies the logical player/session across reconnects.
- Connection ID: identifies one specific WebSocket, including an older socket that may still be closing.
- Last-seen time or lease: records when that particular connection last proved it was alive.
On connection, authenticate the player, establish or resume the logical session, and register the new connection ID. On reconnect, restore the subscriptions or other resumable state the new connection needs. Keep the old and new connection identities distinct until the old one is removed or expires.
Use heartbeats and expiry as the recovery path
Refresh a per-connection last-seen timestamp or lease when a heartbeat arrives. If the lease expires without a refresh, remove that connection as stale. This expiry path handles abrupt network loss, process crashes, and other cases where a clean close callback never runs.
For otherwise idle clients, Microsoft recommends periodic client pings and a timeout that allows slack beyond the expected interval. The Python websockets 13.0 documentation describes a configurable Ping/Pong keepalive and heartbeat loop: its example waits 20 seconds before sending a Ping and expects a Pong within 20 seconds. Those are library-example values, not universal settings. Ping/Pong and application-level heartbeats also differ in which endpoint can observe or act on them, so choose the mechanism for the failure each side needs to detect.
Choose heartbeat cadence and expiry based on the application’s detection target, expected latency or jitter, and the shortest relevant network idle timeout. Shorter intervals can detect failures sooner, but create more traffic and can mark a live connection dead during delay or sleep/wake. Longer intervals reduce heartbeat load but leave stale presence visible for longer. Test the chosen thresholds under packet loss, sleep/wake, abrupt process termination, reconnect overlap, and simultaneous sessions.
Make cleanup safe when reconnects overlap
Cleanup should be idempotent: processing the same close or expiry more than once must not corrupt presence. More importantly, remove only the connection ID being closed or expired. Do not let a close callback for an old socket unconditionally set the whole player to offline.
- On connect: authenticate, resume or establish the logical session, and register the new connection ID.
- On heartbeat: refresh liveness for that connection ID only.
- On clean close: remove only the connection ID that closed.
- On lease expiry: remove the expired connection and any stale association it still has.
- When deciding player presence: emit the player-leave event only if no other valid connection remains for that player/session.
This ordering prevents a delayed close from an old socket from undoing a successful reconnect. If a player can have multiple tabs or devices, a player is still online while any valid connection remains; define that policy explicitly for the game rather than relying on a single connection’s lifecycle.
Choose storage that matches your deployment
In a single-process service, a local mapping and reference count may be sufficient, provided expiry also cleans up connections whose close events were missed. In a multi-instance deployment, presence must be shared between instances or reconnect requests must be routed to the instance that owns the resumable state. Otherwise, one process may not know that another process has a live connection for the same player.
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Redis documents expiring session keys and sets that can track multiple sessions associated with a user. Those structures can support leases and multi-session tracking, but a data store does not by itself guarantee correct presence. Connection IDs, update ordering, ownership checks, and idempotent leave events still determine whether races are handled correctly. See the Redis session-store documentation.
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A timestamped presence set or per-connection lease can both support stale filtering. Choose according to how the application queries presence and removes expired entries; keep the expiry tied to each connection or session whose liveness is being tracked.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Bound reconnect retries and resumable state
After an abnormal closure, clients should avoid immediately reconnecting in lockstep. RFC 6455 Section 7.2.3 recommends randomizing the first retry delay and increasing delays after repeated failures, for example with truncated binary exponential backoff. It gives a randomized initial delay of 0–5 seconds as a reasonable example, not a mandatory setting. The RFC does not prescribe a universal retry count or total retry window; choose those according to the game’s recovery expectations and service capacity. See RFC 6455.
Bound resumable server-side state with a TTL as well. A disconnected player should not retain subscriptions or session data indefinitely if they never return. Set the TTL to fit the reconnect window the product intends to support, and expire the logical session only when that window ends—not merely because one socket closed.
Set thresholds from the product’s presence policy
There is no single heartbeat interval or stale TTL that works for every game. Before choosing values, decide what “offline” means and how quickly the room must reflect a silent loss. Then balance the cost of false-offline decisions against the cost of leaving a dead connection visible.
- Detection delay: how long can a room show a disconnected player as online?
- False-offline tolerance: how much jitter, packet delay, or device sleep/wake should a live player be allowed?
- Connection policy: may the player have multiple tabs or devices, and can old and new sockets overlap?
- State ownership: is presence local to one process, shared across instances, or held in a resumable session store?
- Operational cost: what heartbeat write, read, and event fan-out volume does the selected cadence create?
Validate the policy against the deployed framework version and network conditions. In particular, test that a replacement connection remains online when an old socket closes late, that stale leases eventually remove dead connections, and that the player-leave event is emitted only when the final valid connection is gone.
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