Track a player as a logical member of a match, not as a socket. Authenticate every new connection, associate it with the player’s stable identity and the correct match, and update authoritative match state according to an explicit reconnect policy. Keep that state in-process when one server owns the match; use shared, expiring state only when other processes must see it.
Model connection, match presence, and account status separately
A reconnect creates a new transport connection. It does not, by itself, prove that the returning client is the same authorized player or that the player should re-enter a particular match. Keep distinct records or states for:
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- Transport connection: the current socket or connection, which can disappear and be replaced.
- Authenticated player: the stable user identity established by credentials or a server-issued token.
- Match presence: whether that player currently occupies a place in the authoritative match state, or has a temporary reservation under your rules.
- Account online status: a broader application-level status that may have different owners and lifetimes from a match connection.
Use the authenticated user ID as the logical membership key, and retain a connection ID or platform player-session ID where needed. A connection ID alone changes on reconnect; a user ID alone may not identify a particular reserved server slot. Make the relationship explicit rather than treating these identifiers as interchangeable.
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The key architectural question is which component owns the match state. A shared presence record can help processes locate session information, but it does not decide gameplay membership unless your design gives it that authority. Avoid letting a stale cache or notification overrule the process that owns the match.
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| Approach | Best fit | Reconnect behavior and trade-off |
|---|---|---|
| In-process match state | One process owns the authoritative match. | Simple and direct. State does not automatically follow a reconnect routed to another process. |
| Framework-managed match callbacks and reservations | A framework such as Nakama owns match lifecycle. | Provides structured join/leave state and a reservation hook; grace periods and restoration rules remain game-specific. |
| Shared Redis session or presence record | Multiple processes need shared session visibility. | TTL can clean up stale records; the application must choose expiry, handle concurrent updates, and preserve authoritative match ownership. |
| Hosted player-session lifecycle such as GameLift | The hosting layer issues and validates player-session IDs. | Provides explicit slot activation and removal operations; gameplay restoration still belongs to game logic. |
Decide who owns authoritative match state, whether reconnects can land on another process, how identity is validated, how simultaneous reconnects are serialized, how stale records expire, and whether the hosting layer or game framework manages player slots.
Implement reconnect as a validated state transition
- Authenticate the new connection. Validate credentials or a server-issued player-session token before linking the connection to an existing player or match. A client assertion that it was previously present is not proof of authorization.
- Resolve the intended match and policy. Check whether the player’s match is still active and whether that player is eligible to rejoin or reclaim a reservation. Define what happens if another connection is already active for the same identity.
- Update authoritative state atomically or through its owner. Attach the new connection to the logical player and invalidate or supersede stale connection state as appropriate. Ensure two near-simultaneous reconnects cannot both claim the same membership.
- Restore gameplay state only after acceptance. Rejoining a match is a game-level operation. A valid connection or available hosting slot does not itself restore position, inventory, or other gameplay state.
- Handle disconnection and final departure distinctly. A transport loss may trigger a temporary-absence state and reservation; an explicit leave, match end, or policy timeout may close the logical membership. Remove or expire records when the session is truly over.
These transitions should have a clear owner and ordering. For example, the match-owning process can serialize joins and leaves, while a shared store holds cross-process lookup data. If a shared store also arbitrates claims, use an atomic compare-and-update rather than a read followed by an unprotected write.
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Use local state when one process owns the match
For a single-process match, a map keyed by authenticated user ID is often sufficient for current presences. Update it through the match’s join and leave handling, and keep the current connection reference as a separate value. The limitation is ownership: a local map is not automatically available if a reconnect is routed to a different process. In that case, route the reconnect to the match owner or design an explicit cross-process handoff; do not assume local memory is shared.
Use Redis for cross-process visibility, not as an accidental authority
A shared Redis record can expose session information to multiple application servers. The Redis Go session-store guide demonstrates server-side session data shared across servers, with TTL expiration, TTL refresh on activity, and deletion at logout: Redis session-store guide. Adapting that web-session pattern to game presence is an architectural choice, not a game-specific guarantee.
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A presence record might contain a stable session or player identifier, match identifier, last-activity time, and a generation value that your application uses to reject updates from superseded connections. The generation-value technique is a design recommendation, not a behavior prescribed by that guide. Choose expiration based on match rules and the consequences of reserving capacity; a TTL should clean up abandoned records, not silently define your entire reconnect policy.
Redis also documents a matchmaking example using sorted sets for ordered queues, hashes for metadata, expiring JSON room records, and WATCH/MULTI to avoid acting on stale queue state. The tutorial, published March 25, 2026, is an Express API example rather than a Go game-server implementation: Redis matchmaking tutorial. Its concurrency pattern is relevant by analogy: protect contested presence updates with atomic operations or serialization when concurrent reconnects could claim the same membership.
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Pub/Sub can tell downstream services that room or presence state changed, but treat it as a notification rather than the persisted source of truth. A subscriber that misses an event should be able to refresh from authoritative state.
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Apply the lifecycle rules in GameLift or Nakama
Amazon GameLift Servers Go SDK
GameLift separates player-session slot lifecycle operations. The server calls ActivateGameSession() when initialization is complete and it can receive players. AcceptPlayerSession(playerSessionID) validates the supplied player-session ID and changes the slot from RESERVED to ACTIVE. RemovePlayerSession(playerSessionID) reports disconnection and returns the slot to available. DescribePlayerSessions() can retrieve session data for one session, one game session, or sessions associated with a player ID. See the GameLift Servers Go SDK actions.
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These are hosting and slot operations. Your game still decides whether a disconnect is temporary, how a returning player is authenticated and mapped to gameplay state, and whether the match permits restoration. A slot becoming available is not evidence that the player’s gameplay state has been restored.
Nakama authoritative multiplayer
Nakama’s Go match handler provides join, leave, loop, termination, and signal callbacks. Its authoritative multiplayer example stores presences in match state keyed by user ID, adds entries in MatchJoin, and removes them in MatchLeave. MatchSignal can mark a user ID or session ID as reserved in match state before a later join attempt, which can support a reconnect or matchmaker-reservation flow. See the Nakama Go match-handler reference.
The callback and reservation mechanism does not establish a universal grace period. Your game must determine whether and how long to retain a reservation, and what state to restore when the player rejoins.
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Set the reconnect policy instead of guessing a timeout
There is no universal heartbeat interval or reservation duration established by these platform examples. Set policy based on network conditions, match rules, fairness, and the cost of holding a slot. Specify:
- Which disconnects are recoverable, and which events count as an intentional or final departure.
- When other players or services should see someone as temporarily absent rather than gone.
- How long a slot or reservation remains available, and which component enforces expiry.
- Whether one account may have multiple simultaneous sessions or only one active match connection.
- What happens when the match ends, the reservation expires, or a second reconnect arrives while the first is being processed.
These choices belong to the game’s application policy. Do not present a particular timeout, heartbeat cadence, seamless-reconnect guarantee, or exactly-once join behavior as a platform default unless your implementation actually provides it.
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