Cut off room delivery when membership is revoked mid-replay
A temporary responder is removed while a long history replay is streaming. The established socket keeps receiving new private notes until reconnect.
- Focused work estimate
- 3h 30m + prerequisites
- Priority in the scenario
- Urgent
- Engineering practice
- Authorization races · Subscription lifecycle · Security boundaries
Estimated field mix
- Security60%
- Real-time systems40%
Field percentages are editorial estimates of the ticket's engineering focus. They total 100%; they are not measured time, proficiency scores, or ownership evidence.
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Project context
The fictional Harbor operations team coordinates synthetic incidents in a shared room. Engineers post status notes and claim response tasks while connections come and go. Scope is one application gateway, a durable room event store, and fixture clients; alert paging and external chat delivery are excluded.
Setup prerequisites
- Room membership and command contracts
- Synthetic incident events and a controllable transport harness
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
- LIVE-101 · Show the difference between connected and caught up
- LIVE-102 · Reject malformed room events before they reach the reducer
- LIVE-103 · Authorize room subscription before replaying its history
- LIVE-104 · Stop duplicate and out-of-order notes confusing the timeline
- LIVE-105 · Recover when a reconnect cursor is older than retained history
- LIVE-106 · Reconcile a task claim when its acknowledgement is lost
- LIVE-107 · Expire disconnected presence without rewriting incident history
Acceptance criteria
- Membership changes invalidate active subscriptions and pending replay batches for that session and room.
- Commands recheck current authority before committing, even when the socket was previously authorized.
- After the defined revocation barrier, no queued private frames are delivered and listener resources are released.
Implementation constraints
- Specify the barrier and in-flight message limits; do not promise retroactive removal of data already delivered.
Verification to include
- Revoke a member between replay batches and assert no subsequent private frames cross the barrier.
- Race revocation with task claim and a queued live note; reject unauthorized commit and remove all room listeners.
Deliverables
- Revocation-aware subscription lifecycle and race harness
Rollout and recovery
Require the race harness before temporary-member use; close affected room sockets if revocation propagation is uncertain.
Value of the work
For the engineer: Practice event identity, ordering, replay, authorization, and bounded backpressure in one understandable system.
For the team: Inspect how an engineer keeps collaborative state trustworthy during failures without relying on optimistic success messages.
Evidence boundaries
Outcome Evidence: Tests, patches, and runbooks are requested deliverables. They become Outcome Evidence only through a qualified Mission and immutable Evidence IDs.
Ownership Evidence: Independent adaptation must be observed under a declared verification policy and cite immutable Evidence IDs. Completing a planning ticket establishes no Ownership Evidence.